Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

20 files changed, 16682 insertions, 0 deletions

diff --git a/vendor/clap_builder/src/builder/action.rs b/vendor/clap_builder/src/builder/action.rs
new file mode 100644
index 0000000..2def801
--- /dev/null
+++ b/vendor/clap_builder/src/builder/action.rs
@@ -0,0 +1,418 @@
+#[cfg(debug_assertions)]
+use crate::util::AnyValueId;
+
+/// Behavior of arguments when they are encountered while parsing
+///
+/// # Examples
+///
+/// ```rust
+/// # #[cfg(feature = "help")] {
+/// # use clap_builder as clap;
+/// # use clap::Command;
+/// # use clap::Arg;
+/// let cmd = Command::new("mycmd")
+///     .arg(
+///         Arg::new("special-help")
+///             .short('?')
+///             .action(clap::ArgAction::Help)
+///     );
+///
+/// // Existing help still exists
+/// let err = cmd.clone().try_get_matches_from(["mycmd", "-h"]).unwrap_err();
+/// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp);
+///
+/// // New help available
+/// let err = cmd.try_get_matches_from(["mycmd", "-?"]).unwrap_err();
+/// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp);
+/// # }
+/// ```
+#[derive(Clone, Debug)]
+#[non_exhaustive]
+#[allow(missing_copy_implementations)] // In the future, we may accept `Box<dyn ...>`
+pub enum ArgAction {
+    /// When encountered, store the associated value(s) in [`ArgMatches`][crate::ArgMatches]
+    ///
+    /// **NOTE:** If the argument has previously been seen, it will result in a
+    /// [`ArgumentConflict`][crate::error::ErrorKind::ArgumentConflict] unless
+    /// [`Command::args_override_self(true)`][crate::Command::args_override_self] is set.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("flag")
+    ///             .long("flag")
+    ///             .action(clap::ArgAction::Set)
+    ///     );
+    ///
+    /// let matches = cmd.try_get_matches_from(["mycmd", "--flag", "value"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_many::<String>("flag").unwrap_or_default().map(|v| v.as_str()).collect::<Vec<_>>(),
+    ///     vec!["value"]
+    /// );
+    /// ```
+    Set,
+    /// When encountered, store the associated value(s) in [`ArgMatches`][crate::ArgMatches]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("flag")
+    ///             .long("flag")
+    ///             .action(clap::ArgAction::Append)
+    ///     );
+    ///
+    /// let matches = cmd.try_get_matches_from(["mycmd", "--flag", "value1", "--flag", "value2"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_many::<String>("flag").unwrap_or_default().map(|v| v.as_str()).collect::<Vec<_>>(),
+    ///     vec!["value1", "value2"]
+    /// );
+    /// ```
+    Append,
+    /// When encountered, act as if `"true"` was encountered on the command-line
+    ///
+    /// If no [`default_value`][super::Arg::default_value] is set, it will be `false`.
+    ///
+    /// No value is allowed. To optionally accept a value, see
+    /// [`Arg::default_missing_value`][super::Arg::default_missing_value]
+    ///
+    /// **NOTE:** If the argument has previously been seen, it will result in a
+    /// [`ArgumentConflict`][crate::error::ErrorKind::ArgumentConflict] unless
+    /// [`Command::args_override_self(true)`][crate::Command::args_override_self] is set.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("flag")
+    ///             .long("flag")
+    ///             .action(clap::ArgAction::SetTrue)
+    ///     );
+    ///
+    /// let matches = cmd.clone().try_get_matches_from(["mycmd", "--flag"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_flag("flag"),
+    ///     true
+    /// );
+    ///
+    /// let matches = cmd.try_get_matches_from(["mycmd"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_flag("flag"),
+    ///     false
+    /// );
+    /// ```
+    ///
+    /// You can use [`TypedValueParser::map`][crate::builder::TypedValueParser::map] to have the
+    /// flag control an application-specific type:
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// # use clap::builder::TypedValueParser as _;
+    /// # use clap::builder::BoolishValueParser;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("flag")
+    ///             .long("flag")
+    ///             .action(clap::ArgAction::SetTrue)
+    ///             .value_parser(
+    ///                 BoolishValueParser::new()
+    ///                 .map(|b| -> usize {
+    ///                     if b { 10 } else { 5 }
+    ///                 })
+    ///             )
+    ///     );
+    ///
+    /// let matches = cmd.clone().try_get_matches_from(["mycmd", "--flag"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_one::<usize>("flag").copied(),
+    ///     Some(10)
+    /// );
+    ///
+    /// let matches = cmd.try_get_matches_from(["mycmd"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_one::<usize>("flag").copied(),
+    ///     Some(5)
+    /// );
+    /// ```
+    SetTrue,
+    /// When encountered, act as if `"false"` was encountered on the command-line
+    ///
+    /// If no [`default_value`][super::Arg::default_value] is set, it will be `true`.
+    ///
+    /// No value is allowed. To optionally accept a value, see
+    /// [`Arg::default_missing_value`][super::Arg::default_missing_value]
+    ///
+    /// **NOTE:** If the argument has previously been seen, it will result in a
+    /// [`ArgumentConflict`][crate::error::ErrorKind::ArgumentConflict] unless
+    /// [`Command::args_override_self(true)`][crate::Command::args_override_self] is set.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("flag")
+    ///             .long("flag")
+    ///             .action(clap::ArgAction::SetFalse)
+    ///     );
+    ///
+    /// let matches = cmd.clone().try_get_matches_from(["mycmd", "--flag"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_flag("flag"),
+    ///     false
+    /// );
+    ///
+    /// let matches = cmd.try_get_matches_from(["mycmd"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_flag("flag"),
+    ///     true
+    /// );
+    /// ```
+    SetFalse,
+    /// When encountered, increment a `u8` counter
+    ///
+    /// If no [`default_value`][super::Arg::default_value] is set, it will be `0`.
+    ///
+    /// No value is allowed. To optionally accept a value, see
+    /// [`Arg::default_missing_value`][super::Arg::default_missing_value]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("flag")
+    ///             .long("flag")
+    ///             .action(clap::ArgAction::Count)
+    ///     );
+    ///
+    /// let matches = cmd.clone().try_get_matches_from(["mycmd", "--flag", "--flag"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_count("flag"),
+    ///     2
+    /// );
+    ///
+    /// let matches = cmd.try_get_matches_from(["mycmd"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_count("flag"),
+    ///     0
+    /// );
+    /// ```
+    Count,
+    /// When encountered, display [`Command::print_help`][super::Command::print_help]
+    ///
+    /// Depending on the flag, [`Command::print_long_help`][super::Command::print_long_help] may be shown
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("special-help")
+    ///             .short('?')
+    ///             .action(clap::ArgAction::Help)
+    ///     );
+    ///
+    /// // Existing help still exists
+    /// let err = cmd.clone().try_get_matches_from(["mycmd", "-h"]).unwrap_err();
+    /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp);
+    ///
+    /// // New help available
+    /// let err = cmd.try_get_matches_from(["mycmd", "-?"]).unwrap_err();
+    /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp);
+    /// # }
+    /// ```
+    Help,
+    /// When encountered, display [`Command::print_help`][super::Command::print_help]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("special-help")
+    ///             .short('?')
+    ///             .action(clap::ArgAction::HelpShort)
+    ///     );
+    ///
+    /// // Existing help still exists
+    /// let err = cmd.clone().try_get_matches_from(["mycmd", "-h"]).unwrap_err();
+    /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp);
+    ///
+    /// // New help available
+    /// let err = cmd.try_get_matches_from(["mycmd", "-?"]).unwrap_err();
+    /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp);
+    /// # }
+    /// ```
+    HelpShort,
+    /// When encountered, display [`Command::print_long_help`][super::Command::print_long_help]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("special-help")
+    ///             .short('?')
+    ///             .action(clap::ArgAction::HelpLong)
+    ///     );
+    ///
+    /// // Existing help still exists
+    /// let err = cmd.clone().try_get_matches_from(["mycmd", "-h"]).unwrap_err();
+    /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp);
+    ///
+    /// // New help available
+    /// let err = cmd.try_get_matches_from(["mycmd", "-?"]).unwrap_err();
+    /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayHelp);
+    /// # }
+    /// ```
+    HelpLong,
+    /// When encountered, display [`Command::version`][super::Command::version]
+    ///
+    /// Depending on the flag, [`Command::long_version`][super::Command::long_version] may be shown
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// let cmd = Command::new("mycmd")
+    ///     .version("1.0.0")
+    ///     .arg(
+    ///         Arg::new("special-version")
+    ///             .long("special-version")
+    ///             .action(clap::ArgAction::Version)
+    ///     );
+    ///
+    /// // Existing help still exists
+    /// let err = cmd.clone().try_get_matches_from(["mycmd", "--version"]).unwrap_err();
+    /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayVersion);
+    ///
+    /// // New help available
+    /// let err = cmd.try_get_matches_from(["mycmd", "--special-version"]).unwrap_err();
+    /// assert_eq!(err.kind(), clap::error::ErrorKind::DisplayVersion);
+    /// ```
+    Version,
+}
+
+impl ArgAction {
+    /// Returns whether this action accepts values on the command-line
+    ///
+    /// [`default_values`][super::Arg::default_values] and [`env`][super::Arg::env] may still be
+    /// processed.
+    pub fn takes_values(&self) -> bool {
+        match self {
+            Self::Set => true,
+            Self::Append => true,
+            Self::SetTrue => false,
+            Self::SetFalse => false,
+            Self::Count => false,
+            Self::Help => false,
+            Self::HelpShort => false,
+            Self::HelpLong => false,
+            Self::Version => false,
+        }
+    }
+
+    pub(crate) fn default_value(&self) -> Option<&'static std::ffi::OsStr> {
+        match self {
+            Self::Set => None,
+            Self::Append => None,
+            Self::SetTrue => Some(std::ffi::OsStr::new("false")),
+            Self::SetFalse => Some(std::ffi::OsStr::new("true")),
+            Self::Count => Some(std::ffi::OsStr::new("0")),
+            Self::Help => None,
+            Self::HelpShort => None,
+            Self::HelpLong => None,
+            Self::Version => None,
+        }
+    }
+
+    pub(crate) fn default_missing_value(&self) -> Option<&'static std::ffi::OsStr> {
+        match self {
+            Self::Set => None,
+            Self::Append => None,
+            Self::SetTrue => Some(std::ffi::OsStr::new("true")),
+            Self::SetFalse => Some(std::ffi::OsStr::new("false")),
+            Self::Count => None,
+            Self::Help => None,
+            Self::HelpShort => None,
+            Self::HelpLong => None,
+            Self::Version => None,
+        }
+    }
+
+    pub(crate) fn default_value_parser(&self) -> Option<super::ValueParser> {
+        match self {
+            Self::Set => None,
+            Self::Append => None,
+            Self::SetTrue => Some(super::ValueParser::bool()),
+            Self::SetFalse => Some(super::ValueParser::bool()),
+            Self::Count => Some(crate::value_parser!(u8).into()),
+            Self::Help => None,
+            Self::HelpShort => None,
+            Self::HelpLong => None,
+            Self::Version => None,
+        }
+    }
+
+    #[cfg(debug_assertions)]
+    pub(crate) fn value_type_id(&self) -> Option<AnyValueId> {
+        match self {
+            Self::Set => None,
+            Self::Append => None,
+            Self::SetTrue => None,
+            Self::SetFalse => None,
+            Self::Count => Some(AnyValueId::of::<CountType>()),
+            Self::Help => None,
+            Self::HelpShort => None,
+            Self::HelpLong => None,
+            Self::Version => None,
+        }
+    }
+}
+
+pub(crate) type CountType = u8;
diff --git a/vendor/clap_builder/src/builder/app_settings.rs b/vendor/clap_builder/src/builder/app_settings.rs
new file mode 100644
index 0000000..f9a87da
--- /dev/null
+++ b/vendor/clap_builder/src/builder/app_settings.rs
@@ -0,0 +1,84 @@
+#[allow(unused)]
+use crate::Arg;
+#[allow(unused)]
+use crate::Command;
+
+#[derive(Default, Copy, Clone, Debug, PartialEq, Eq)]
+pub(crate) struct AppFlags(u32);
+
+impl AppFlags {
+    pub(crate) fn set(&mut self, setting: AppSettings) {
+        self.0 |= setting.bit();
+    }
+
+    pub(crate) fn unset(&mut self, setting: AppSettings) {
+        self.0 &= !setting.bit();
+    }
+
+    pub(crate) fn is_set(&self, setting: AppSettings) -> bool {
+        self.0 & setting.bit() != 0
+    }
+
+    pub(crate) fn insert(&mut self, other: Self) {
+        self.0 |= other.0;
+    }
+}
+
+impl std::ops::BitOr for AppFlags {
+    type Output = Self;
+
+    fn bitor(mut self, rhs: Self) -> Self::Output {
+        self.insert(rhs);
+        self
+    }
+}
+
+/// Application level settings, which affect how [`Command`] operates
+///
+/// **NOTE:** When these settings are used, they apply only to current command, and are *not*
+/// propagated down or up through child or parent subcommands
+///
+/// [`Command`]: crate::Command
+#[derive(Debug, PartialEq, Copy, Clone)]
+#[repr(u8)]
+pub(crate) enum AppSettings {
+    IgnoreErrors,
+    AllowHyphenValues,
+    AllowNegativeNumbers,
+    AllArgsOverrideSelf,
+    AllowMissingPositional,
+    TrailingVarArg,
+    DontDelimitTrailingValues,
+    InferLongArgs,
+    InferSubcommands,
+    SubcommandRequired,
+    AllowExternalSubcommands,
+    Multicall,
+    SubcommandsNegateReqs,
+    ArgsNegateSubcommands,
+    SubcommandPrecedenceOverArg,
+    FlattenHelp,
+    ArgRequiredElseHelp,
+    NextLineHelp,
+    DisableColoredHelp,
+    DisableHelpFlag,
+    DisableHelpSubcommand,
+    DisableVersionFlag,
+    PropagateVersion,
+    Hidden,
+    HidePossibleValues,
+    HelpExpected,
+    NoBinaryName,
+    #[allow(dead_code)]
+    ColorAuto,
+    ColorAlways,
+    ColorNever,
+    Built,
+    BinNameBuilt,
+}
+
+impl AppSettings {
+    fn bit(self) -> u32 {
+        1 << (self as u8)
+    }
+}
diff --git a/vendor/clap_builder/src/builder/arg.rs b/vendor/clap_builder/src/builder/arg.rs
new file mode 100644
index 0000000..f83b464
--- /dev/null
+++ b/vendor/clap_builder/src/builder/arg.rs
@@ -0,0 +1,4800 @@
+// Std
+#[cfg(feature = "env")]
+use std::env;
+#[cfg(feature = "env")]
+use std::ffi::OsString;
+use std::{
+    cmp::{Ord, Ordering},
+    fmt::{self, Display, Formatter},
+    str,
+};
+
+// Internal
+use super::{ArgFlags, ArgSettings};
+use crate::builder::ArgPredicate;
+use crate::builder::IntoResettable;
+use crate::builder::OsStr;
+use crate::builder::PossibleValue;
+use crate::builder::Str;
+use crate::builder::StyledStr;
+use crate::builder::Styles;
+use crate::builder::ValueRange;
+use crate::util::AnyValueId;
+use crate::ArgAction;
+use crate::Id;
+use crate::ValueHint;
+use crate::INTERNAL_ERROR_MSG;
+
+/// The abstract representation of a command line argument. Used to set all the options and
+/// relationships that define a valid argument for the program.
+///
+/// There are two methods for constructing [`Arg`]s, using the builder pattern and setting options
+/// manually, or using a usage string which is far less verbose but has fewer options. You can also
+/// use a combination of the two methods to achieve the best of both worlds.
+///
+/// - [Basic API][crate::Arg#basic-api]
+/// - [Value Handling][crate::Arg#value-handling]
+/// - [Help][crate::Arg#help-1]
+/// - [Advanced Argument Relations][crate::Arg#advanced-argument-relations]
+/// - [Reflection][crate::Arg#reflection]
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// # use clap::{Arg, arg, ArgAction};
+/// // Using the traditional builder pattern and setting each option manually
+/// let cfg = Arg::new("config")
+///       .short('c')
+///       .long("config")
+///       .action(ArgAction::Set)
+///       .value_name("FILE")
+///       .help("Provides a config file to myprog");
+/// // Using a usage string (setting a similar argument to the one above)
+/// let input = arg!(-i --input <FILE> "Provides an input file to the program");
+/// ```
+#[derive(Default, Clone)]
+pub struct Arg {
+    pub(crate) id: Id,
+    pub(crate) help: Option<StyledStr>,
+    pub(crate) long_help: Option<StyledStr>,
+    pub(crate) action: Option<ArgAction>,
+    pub(crate) value_parser: Option<super::ValueParser>,
+    pub(crate) blacklist: Vec<Id>,
+    pub(crate) settings: ArgFlags,
+    pub(crate) overrides: Vec<Id>,
+    pub(crate) groups: Vec<Id>,
+    pub(crate) requires: Vec<(ArgPredicate, Id)>,
+    pub(crate) r_ifs: Vec<(Id, OsStr)>,
+    pub(crate) r_ifs_all: Vec<(Id, OsStr)>,
+    pub(crate) r_unless: Vec<Id>,
+    pub(crate) r_unless_all: Vec<Id>,
+    pub(crate) short: Option<char>,
+    pub(crate) long: Option<Str>,
+    pub(crate) aliases: Vec<(Str, bool)>, // (name, visible)
+    pub(crate) short_aliases: Vec<(char, bool)>, // (name, visible)
+    pub(crate) disp_ord: Option<usize>,
+    pub(crate) val_names: Vec<Str>,
+    pub(crate) num_vals: Option<ValueRange>,
+    pub(crate) val_delim: Option<char>,
+    pub(crate) default_vals: Vec<OsStr>,
+    pub(crate) default_vals_ifs: Vec<(Id, ArgPredicate, Option<OsStr>)>,
+    pub(crate) default_missing_vals: Vec<OsStr>,
+    #[cfg(feature = "env")]
+    pub(crate) env: Option<(OsStr, Option<OsString>)>,
+    pub(crate) terminator: Option<Str>,
+    pub(crate) index: Option<usize>,
+    pub(crate) help_heading: Option<Option<Str>>,
+    pub(crate) value_hint: Option<ValueHint>,
+}
+
+/// # Basic API
+impl Arg {
+    /// Create a new [`Arg`] with a unique name.
+    ///
+    /// The name is used to check whether or not the argument was used at
+    /// runtime, get values, set relationships with other args, etc..
+    ///
+    /// **NOTE:** In the case of arguments that take values (i.e. [`Arg::action(ArgAction::Set)`])
+    /// and positional arguments (i.e. those without a preceding `-` or `--`) the name will also
+    /// be displayed when the user prints the usage/help information of the program.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Arg::new("config")
+    /// # ;
+    /// ```
+    /// [`Arg::action(ArgAction::Set)`]: Arg::action()
+    pub fn new(id: impl Into<Id>) -> Self {
+        Arg::default().id(id)
+    }
+
+    /// Set the identifier used for referencing this argument in the clap API.
+    ///
+    /// See [`Arg::new`] for more details.
+    #[must_use]
+    pub fn id(mut self, id: impl Into<Id>) -> Self {
+        self.id = id.into();
+        self
+    }
+
+    /// Sets the short version of the argument without the preceding `-`.
+    ///
+    /// By default `V` and `h` are used by the auto-generated `version` and `help` arguments,
+    /// respectively. You will need to disable the auto-generated flags
+    /// ([`disable_help_flag`][crate::Command::disable_help_flag],
+    /// [`disable_version_flag`][crate::Command::disable_version_flag]) and define your own.
+    ///
+    /// # Examples
+    ///
+    /// When calling `short`, use a single valid UTF-8 character which will allow using the
+    /// argument via a single hyphen (`-`) such as `-c`:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg,  ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("config")
+    ///         .short('c')
+    ///         .action(ArgAction::Set))
+    ///     .get_matches_from(vec![
+    ///         "prog", "-c", "file.toml"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("config").map(String::as_str), Some("file.toml"));
+    /// ```
+    ///
+    /// To use `-h` for your own flag and still have help:
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg,  ArgAction};
+    /// let m = Command::new("prog")
+    ///     .disable_help_flag(true)
+    ///     .arg(Arg::new("host")
+    ///         .short('h')
+    ///         .long("host"))
+    ///     .arg(Arg::new("help")
+    ///         .long("help")
+    ///         .global(true)
+    ///         .action(ArgAction::Help))
+    ///     .get_matches_from(vec![
+    ///         "prog", "-h", "wikipedia.org"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("host").map(String::as_str), Some("wikipedia.org"));
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn short(mut self, s: impl IntoResettable<char>) -> Self {
+        if let Some(s) = s.into_resettable().into_option() {
+            debug_assert!(s != '-', "short option name cannot be `-`");
+            self.short = Some(s);
+        } else {
+            self.short = None;
+        }
+        self
+    }
+
+    /// Sets the long version of the argument without the preceding `--`.
+    ///
+    /// By default `version` and `help` are used by the auto-generated `version` and `help`
+    /// arguments, respectively. You may use the word `version` or `help` for the long form of your
+    /// own arguments, in which case `clap` simply will not assign those to the auto-generated
+    /// `version` or `help` arguments.
+    ///
+    /// **NOTE:** Any leading `-` characters will be stripped
+    ///
+    /// # Examples
+    ///
+    /// To set `long` use a word containing valid UTF-8. If you supply a double leading
+    /// `--` such as `--config` they will be stripped. Hyphens in the middle of the word, however,
+    /// will *not* be stripped (i.e. `config-file` is allowed).
+    ///
+    /// Setting `long` allows using the argument via a double hyphen (`--`) such as `--config`
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .long("config")
+    ///         .action(ArgAction::Set))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--config", "file.toml"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("cfg").map(String::as_str), Some("file.toml"));
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn long(mut self, l: impl IntoResettable<Str>) -> Self {
+        self.long = l.into_resettable().into_option();
+        self
+    }
+
+    /// Add an alias, which functions as a hidden long flag.
+    ///
+    /// This is more efficient, and easier than creating multiple hidden arguments as one only
+    /// needs to check for the existence of this command, and not all variants.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///             .arg(Arg::new("test")
+    ///             .long("test")
+    ///             .alias("alias")
+    ///             .action(ArgAction::Set))
+    ///        .get_matches_from(vec![
+    ///             "prog", "--alias", "cool"
+    ///         ]);
+    /// assert_eq!(m.get_one::<String>("test").unwrap(), "cool");
+    /// ```
+    #[must_use]
+    pub fn alias(mut self, name: impl IntoResettable<Str>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            self.aliases.push((name, false));
+        } else {
+            self.aliases.clear();
+        }
+        self
+    }
+
+    /// Add an alias, which functions as a hidden short flag.
+    ///
+    /// This is more efficient, and easier than creating multiple hidden arguments as one only
+    /// needs to check for the existence of this command, and not all variants.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///             .arg(Arg::new("test")
+    ///             .short('t')
+    ///             .short_alias('e')
+    ///             .action(ArgAction::Set))
+    ///        .get_matches_from(vec![
+    ///             "prog", "-e", "cool"
+    ///         ]);
+    /// assert_eq!(m.get_one::<String>("test").unwrap(), "cool");
+    /// ```
+    #[must_use]
+    pub fn short_alias(mut self, name: impl IntoResettable<char>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            debug_assert!(name != '-', "short alias name cannot be `-`");
+            self.short_aliases.push((name, false));
+        } else {
+            self.short_aliases.clear();
+        }
+        self
+    }
+
+    /// Add aliases, which function as hidden long flags.
+    ///
+    /// This is more efficient, and easier than creating multiple hidden subcommands as one only
+    /// needs to check for the existence of this command, and not all variants.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///             .arg(Arg::new("test")
+    ///                     .long("test")
+    ///                     .aliases(["do-stuff", "do-tests", "tests"])
+    ///                     .action(ArgAction::SetTrue)
+    ///                     .help("the file to add")
+    ///                     .required(false))
+    ///             .get_matches_from(vec![
+    ///                 "prog", "--do-tests"
+    ///             ]);
+    /// assert_eq!(m.get_flag("test"), true);
+    /// ```
+    #[must_use]
+    pub fn aliases(mut self, names: impl IntoIterator<Item = impl Into<Str>>) -> Self {
+        self.aliases
+            .extend(names.into_iter().map(|x| (x.into(), false)));
+        self
+    }
+
+    /// Add aliases, which functions as a hidden short flag.
+    ///
+    /// This is more efficient, and easier than creating multiple hidden subcommands as one only
+    /// needs to check for the existence of this command, and not all variants.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///             .arg(Arg::new("test")
+    ///                     .short('t')
+    ///                     .short_aliases(['e', 's'])
+    ///                     .action(ArgAction::SetTrue)
+    ///                     .help("the file to add")
+    ///                     .required(false))
+    ///             .get_matches_from(vec![
+    ///                 "prog", "-s"
+    ///             ]);
+    /// assert_eq!(m.get_flag("test"), true);
+    /// ```
+    #[must_use]
+    pub fn short_aliases(mut self, names: impl IntoIterator<Item = char>) -> Self {
+        for s in names {
+            debug_assert!(s != '-', "short alias name cannot be `-`");
+            self.short_aliases.push((s, false));
+        }
+        self
+    }
+
+    /// Add an alias, which functions as a visible long flag.
+    ///
+    /// Like [`Arg::alias`], except that they are visible inside the help message.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///             .arg(Arg::new("test")
+    ///                 .visible_alias("something-awesome")
+    ///                 .long("test")
+    ///                 .action(ArgAction::Set))
+    ///        .get_matches_from(vec![
+    ///             "prog", "--something-awesome", "coffee"
+    ///         ]);
+    /// assert_eq!(m.get_one::<String>("test").unwrap(), "coffee");
+    /// ```
+    /// [`Command::alias`]: Arg::alias()
+    #[must_use]
+    pub fn visible_alias(mut self, name: impl IntoResettable<Str>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            self.aliases.push((name, true));
+        } else {
+            self.aliases.clear();
+        }
+        self
+    }
+
+    /// Add an alias, which functions as a visible short flag.
+    ///
+    /// Like [`Arg::short_alias`], except that they are visible inside the help message.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///             .arg(Arg::new("test")
+    ///                 .long("test")
+    ///                 .visible_short_alias('t')
+    ///                 .action(ArgAction::Set))
+    ///        .get_matches_from(vec![
+    ///             "prog", "-t", "coffee"
+    ///         ]);
+    /// assert_eq!(m.get_one::<String>("test").unwrap(), "coffee");
+    /// ```
+    #[must_use]
+    pub fn visible_short_alias(mut self, name: impl IntoResettable<char>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            debug_assert!(name != '-', "short alias name cannot be `-`");
+            self.short_aliases.push((name, true));
+        } else {
+            self.short_aliases.clear();
+        }
+        self
+    }
+
+    /// Add aliases, which function as visible long flags.
+    ///
+    /// Like [`Arg::aliases`], except that they are visible inside the help message.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///             .arg(Arg::new("test")
+    ///                 .long("test")
+    ///                 .action(ArgAction::SetTrue)
+    ///                 .visible_aliases(["something", "awesome", "cool"]))
+    ///        .get_matches_from(vec![
+    ///             "prog", "--awesome"
+    ///         ]);
+    /// assert_eq!(m.get_flag("test"), true);
+    /// ```
+    /// [`Command::aliases`]: Arg::aliases()
+    #[must_use]
+    pub fn visible_aliases(mut self, names: impl IntoIterator<Item = impl Into<Str>>) -> Self {
+        self.aliases
+            .extend(names.into_iter().map(|n| (n.into(), true)));
+        self
+    }
+
+    /// Add aliases, which function as visible short flags.
+    ///
+    /// Like [`Arg::short_aliases`], except that they are visible inside the help message.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///             .arg(Arg::new("test")
+    ///                 .long("test")
+    ///                 .action(ArgAction::SetTrue)
+    ///                 .visible_short_aliases(['t', 'e']))
+    ///        .get_matches_from(vec![
+    ///             "prog", "-t"
+    ///         ]);
+    /// assert_eq!(m.get_flag("test"), true);
+    /// ```
+    #[must_use]
+    pub fn visible_short_aliases(mut self, names: impl IntoIterator<Item = char>) -> Self {
+        for n in names {
+            debug_assert!(n != '-', "short alias name cannot be `-`");
+            self.short_aliases.push((n, true));
+        }
+        self
+    }
+
+    /// Specifies the index of a positional argument **starting at** 1.
+    ///
+    /// **NOTE:** The index refers to position according to **other positional argument**. It does
+    /// not define position in the argument list as a whole.
+    ///
+    /// **NOTE:** You can optionally leave off the `index` method, and the index will be
+    /// assigned in order of evaluation. Utilizing the `index` method allows for setting
+    /// indexes out of order
+    ///
+    /// **NOTE:** This is only meant to be used for positional arguments and shouldn't to be used
+    /// with [`Arg::short`] or [`Arg::long`].
+    ///
+    /// **NOTE:** When utilized with [`Arg::num_args(1..)`], only the **last** positional argument
+    /// may be defined as having a variable number of arguments (i.e. with the highest index)
+    ///
+    /// # Panics
+    ///
+    /// [`Command`] will [`panic!`] if indexes are skipped (such as defining `index(1)` and `index(3)`
+    /// but not `index(2)`, or a positional argument is defined as multiple and is not the highest
+    /// index (debug builds)
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Arg::new("config")
+    ///     .index(1)
+    /// # ;
+    /// ```
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("mode")
+    ///         .index(1))
+    ///     .arg(Arg::new("debug")
+    ///         .long("debug")
+    ///         .action(ArgAction::SetTrue))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--debug", "fast"
+    ///     ]);
+    ///
+    /// assert!(m.contains_id("mode"));
+    /// assert_eq!(m.get_one::<String>("mode").unwrap(), "fast"); // notice index(1) means "first positional"
+    ///                                                           // *not* first argument
+    /// ```
+    /// [`Arg::short`]: Arg::short()
+    /// [`Arg::long`]: Arg::long()
+    /// [`Arg::num_args(true)`]: Arg::num_args()
+    /// [`Command`]: crate::Command
+    #[inline]
+    #[must_use]
+    pub fn index(mut self, idx: impl IntoResettable<usize>) -> Self {
+        self.index = idx.into_resettable().into_option();
+        self
+    }
+
+    /// This is a "VarArg" and everything that follows should be captured by it, as if the user had
+    /// used a `--`.
+    ///
+    /// **NOTE:** To start the trailing "VarArg" on unknown flags (and not just a positional
+    /// value), set [`allow_hyphen_values`][Arg::allow_hyphen_values].  Either way, users still
+    /// have the option to explicitly escape ambiguous arguments with `--`.
+    ///
+    /// **NOTE:** [`Arg::value_delimiter`] still applies if set.
+    ///
+    /// **NOTE:** Setting this requires [`Arg::num_args(..)`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg};
+    /// let m = Command::new("myprog")
+    ///     .arg(arg!(<cmd> ... "commands to run").trailing_var_arg(true))
+    ///     .get_matches_from(vec!["myprog", "arg1", "-r", "val1"]);
+    ///
+    /// let trail: Vec<_> = m.get_many::<String>("cmd").unwrap().collect();
+    /// assert_eq!(trail, ["arg1", "-r", "val1"]);
+    /// ```
+    /// [`Arg::num_args(..)`]: crate::Arg::num_args()
+    pub fn trailing_var_arg(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::TrailingVarArg)
+        } else {
+            self.unset_setting(ArgSettings::TrailingVarArg)
+        }
+    }
+
+    /// This arg is the last, or final, positional argument (i.e. has the highest
+    /// index) and is *only* able to be accessed via the `--` syntax (i.e. `$ prog args --
+    /// last_arg`).
+    ///
+    /// Even, if no other arguments are left to parse, if the user omits the `--` syntax
+    /// they will receive an [`UnknownArgument`] error. Setting an argument to `.last(true)` also
+    /// allows one to access this arg early using the `--` syntax. Accessing an arg early, even with
+    /// the `--` syntax is otherwise not possible.
+    ///
+    /// **NOTE:** This will change the usage string to look like `$ prog [OPTIONS] [-- <ARG>]` if
+    /// `ARG` is marked as `.last(true)`.
+    ///
+    /// **NOTE:** This setting will imply [`crate::Command::dont_collapse_args_in_usage`] because failing
+    /// to set this can make the usage string very confusing.
+    ///
+    /// **NOTE**: This setting only applies to positional arguments, and has no effect on OPTIONS
+    ///
+    /// **NOTE:** Setting this requires [taking values][Arg::num_args]
+    ///
+    /// **CAUTION:** Using this setting *and* having child subcommands is not
+    /// recommended with the exception of *also* using
+    /// [`crate::Command::args_conflicts_with_subcommands`]
+    /// (or [`crate::Command::subcommand_negates_reqs`] if the argument marked `Last` is also
+    /// marked [`Arg::required`])
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Arg, ArgAction};
+    /// Arg::new("args")
+    ///     .action(ArgAction::Set)
+    ///     .last(true)
+    /// # ;
+    /// ```
+    ///
+    /// Setting `last` ensures the arg has the highest [index] of all positional args
+    /// and requires that the `--` syntax be used to access it early.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("first"))
+    ///     .arg(Arg::new("second"))
+    ///     .arg(Arg::new("third")
+    ///         .action(ArgAction::Set)
+    ///         .last(true))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "one", "--", "three"
+    ///     ]);
+    ///
+    /// assert!(res.is_ok());
+    /// let m = res.unwrap();
+    /// assert_eq!(m.get_one::<String>("third").unwrap(), "three");
+    /// assert_eq!(m.get_one::<String>("second"), None);
+    /// ```
+    ///
+    /// Even if the positional argument marked `Last` is the only argument left to parse,
+    /// failing to use the `--` syntax results in an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("first"))
+    ///     .arg(Arg::new("second"))
+    ///     .arg(Arg::new("third")
+    ///         .action(ArgAction::Set)
+    ///         .last(true))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "one", "two", "three"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::UnknownArgument);
+    /// ```
+    /// [index]: Arg::index()
+    /// [`UnknownArgument`]: crate::error::ErrorKind::UnknownArgument
+    #[inline]
+    #[must_use]
+    pub fn last(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::Last)
+        } else {
+            self.unset_setting(ArgSettings::Last)
+        }
+    }
+
+    /// Specifies that the argument must be present.
+    ///
+    /// Required by default means it is required, when no other conflicting rules or overrides have
+    /// been evaluated. Conflicting rules take precedence over being required.
+    ///
+    /// **Pro tip:** Flags (i.e. not positional, or arguments that take values) shouldn't be
+    /// required by default. This is because if a flag were to be required, it should simply be
+    /// implied. No additional information is required from user. Flags by their very nature are
+    /// simply boolean on/off switches. The only time a user *should* be required to use a flag
+    /// is if the operation is destructive in nature, and the user is essentially proving to you,
+    /// "Yes, I know what I'm doing."
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .required(true)
+    /// # ;
+    /// ```
+    ///
+    /// Setting required requires that the argument be used at runtime.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required(true)
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--config", "file.conf",
+    ///     ]);
+    ///
+    /// assert!(res.is_ok());
+    /// ```
+    ///
+    /// Setting required and then *not* supplying that argument at runtime is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required(true)
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn required(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::Required)
+        } else {
+            self.unset_setting(ArgSettings::Required)
+        }
+    }
+
+    /// Sets an argument that is required when this one is present
+    ///
+    /// i.e. when using this argument, the following argument *must* be present.
+    ///
+    /// **NOTE:** [Conflicting] rules and [override] rules take precedence over being required
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .requires("input")
+    /// # ;
+    /// ```
+    ///
+    /// Setting [`Arg::requires(name)`] requires that the argument be used at runtime if the
+    /// defining argument is used. If the defining argument isn't used, the other argument isn't
+    /// required
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .requires("input")
+    ///         .long("config"))
+    ///     .arg(Arg::new("input"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert!(res.is_ok()); // We didn't use cfg, so input wasn't required
+    /// ```
+    ///
+    /// Setting [`Arg::requires(name)`] and *not* supplying that argument is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .requires("input")
+    ///         .long("config"))
+    ///     .arg(Arg::new("input"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--config", "file.conf"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    /// [`Arg::requires(name)`]: Arg::requires()
+    /// [Conflicting]: Arg::conflicts_with()
+    /// [override]: Arg::overrides_with()
+    #[must_use]
+    pub fn requires(mut self, arg_id: impl IntoResettable<Id>) -> Self {
+        if let Some(arg_id) = arg_id.into_resettable().into_option() {
+            self.requires.push((ArgPredicate::IsPresent, arg_id));
+        } else {
+            self.requires.clear();
+        }
+        self
+    }
+
+    /// This argument must be passed alone; it conflicts with all other arguments.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .exclusive(true)
+    /// # ;
+    /// ```
+    ///
+    /// Setting an exclusive argument and having any other arguments present at runtime
+    /// is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("exclusive")
+    ///         .action(ArgAction::Set)
+    ///         .exclusive(true)
+    ///         .long("exclusive"))
+    ///     .arg(Arg::new("debug")
+    ///         .long("debug"))
+    ///     .arg(Arg::new("input"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--exclusive", "file.conf", "file.txt"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::ArgumentConflict);
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn exclusive(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::Exclusive)
+        } else {
+            self.unset_setting(ArgSettings::Exclusive)
+        }
+    }
+
+    /// Specifies that an argument can be matched to all child [`Subcommand`]s.
+    ///
+    /// **NOTE:** Global arguments *only* propagate down, **not** up (to parent commands), however
+    /// their values once a user uses them will be propagated back up to parents. In effect, this
+    /// means one should *define* all global arguments at the top level, however it doesn't matter
+    /// where the user *uses* the global argument.
+    ///
+    /// # Examples
+    ///
+    /// Assume an application with two subcommands, and you'd like to define a
+    /// `--verbose` flag that can be called on any of the subcommands and parent, but you don't
+    /// want to clutter the source with three duplicate [`Arg`] definitions.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("verb")
+    ///         .long("verbose")
+    ///         .short('v')
+    ///         .action(ArgAction::SetTrue)
+    ///         .global(true))
+    ///     .subcommand(Command::new("test"))
+    ///     .subcommand(Command::new("do-stuff"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "do-stuff", "--verbose"
+    ///     ]);
+    ///
+    /// assert_eq!(m.subcommand_name(), Some("do-stuff"));
+    /// let sub_m = m.subcommand_matches("do-stuff").unwrap();
+    /// assert_eq!(sub_m.get_flag("verb"), true);
+    /// ```
+    ///
+    /// [`Subcommand`]: crate::Subcommand
+    #[inline]
+    #[must_use]
+    pub fn global(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::Global)
+        } else {
+            self.unset_setting(ArgSettings::Global)
+        }
+    }
+
+    #[inline]
+    pub(crate) fn is_set(&self, s: ArgSettings) -> bool {
+        self.settings.is_set(s)
+    }
+
+    #[inline]
+    #[must_use]
+    pub(crate) fn setting(mut self, setting: ArgSettings) -> Self {
+        self.settings.set(setting);
+        self
+    }
+
+    #[inline]
+    #[must_use]
+    pub(crate) fn unset_setting(mut self, setting: ArgSettings) -> Self {
+        self.settings.unset(setting);
+        self
+    }
+}
+
+/// # Value Handling
+impl Arg {
+    /// Specify how to react to an argument when parsing it.
+    ///
+    /// [ArgAction] controls things like
+    /// - Overwriting previous values with new ones
+    /// - Appending new values to all previous ones
+    /// - Counting how many times a flag occurs
+    ///
+    /// The default action is `ArgAction::Set`
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("flag")
+    ///             .long("flag")
+    ///             .action(clap::ArgAction::Append)
+    ///     );
+    ///
+    /// let matches = cmd.try_get_matches_from(["mycmd", "--flag", "value"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_many::<String>("flag").unwrap_or_default().map(|v| v.as_str()).collect::<Vec<_>>(),
+    ///     vec!["value"]
+    /// );
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn action(mut self, action: impl IntoResettable<ArgAction>) -> Self {
+        self.action = action.into_resettable().into_option();
+        self
+    }
+
+    /// Specify the typed behavior of the argument.
+    ///
+    /// This allows parsing and validating a value before storing it into
+    /// [`ArgMatches`][crate::ArgMatches] as the given type.
+    ///
+    /// Possible value parsers include:
+    /// - [`value_parser!(T)`][crate::value_parser!] for auto-selecting a value parser for a given type
+    ///   - Or [range expressions like `0..=1`][std::ops::RangeBounds] as a shorthand for [`RangedI64ValueParser`][crate::builder::RangedI64ValueParser]
+    /// - `Fn(&str) -> Result<T, E>`
+    /// - `[&str]` and [`PossibleValuesParser`][crate::builder::PossibleValuesParser] for static enumerated values
+    /// - [`BoolishValueParser`][crate::builder::BoolishValueParser], and [`FalseyValueParser`][crate::builder::FalseyValueParser] for alternative `bool` implementations
+    /// - [`NonEmptyStringValueParser`][crate::builder::NonEmptyStringValueParser] for basic validation for strings
+    /// - or any other [`TypedValueParser`][crate::builder::TypedValueParser] implementation
+    ///
+    /// The default value is [`ValueParser::string`][crate::builder::ValueParser::string].
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::ArgAction;
+    /// let mut cmd = clap::Command::new("raw")
+    ///     .arg(
+    ///         clap::Arg::new("color")
+    ///             .long("color")
+    ///             .value_parser(["always", "auto", "never"])
+    ///             .default_value("auto")
+    ///     )
+    ///     .arg(
+    ///         clap::Arg::new("hostname")
+    ///             .long("hostname")
+    ///             .value_parser(clap::builder::NonEmptyStringValueParser::new())
+    ///             .action(ArgAction::Set)
+    ///             .required(true)
+    ///     )
+    ///     .arg(
+    ///         clap::Arg::new("port")
+    ///             .long("port")
+    ///             .value_parser(clap::value_parser!(u16).range(3000..))
+    ///             .action(ArgAction::Set)
+    ///             .required(true)
+    ///     );
+    ///
+    /// let m = cmd.try_get_matches_from_mut(
+    ///     ["cmd", "--hostname", "rust-lang.org", "--port", "3001"]
+    /// ).unwrap();
+    ///
+    /// let color: &String = m.get_one("color")
+    ///     .expect("default");
+    /// assert_eq!(color, "auto");
+    ///
+    /// let hostname: &String = m.get_one("hostname")
+    ///     .expect("required");
+    /// assert_eq!(hostname, "rust-lang.org");
+    ///
+    /// let port: u16 = *m.get_one("port")
+    ///     .expect("required");
+    /// assert_eq!(port, 3001);
+    /// ```
+    pub fn value_parser(mut self, parser: impl IntoResettable<super::ValueParser>) -> Self {
+        self.value_parser = parser.into_resettable().into_option();
+        self
+    }
+
+    /// Specifies the number of arguments parsed per occurrence
+    ///
+    /// For example, if you had a `-f <file>` argument where you wanted exactly 3 'files' you would
+    /// set `.num_args(3)`, and this argument wouldn't be satisfied unless the user
+    /// provided 3 and only 3 values.
+    ///
+    /// Users may specify values for arguments in any of the following methods
+    ///
+    /// - Using a space such as `-o value` or `--option value`
+    /// - Using an equals and no space such as `-o=value` or `--option=value`
+    /// - Use a short and no space such as `-ovalue`
+    ///
+    /// **WARNING:**
+    ///
+    /// Setting a variable number of values (e.g. `1..=10`) for an argument without
+    /// other details can be dangerous in some circumstances. Because multiple values are
+    /// allowed, `--option val1 val2 val3` is perfectly valid. Be careful when designing a CLI
+    /// where **positional arguments** or **subcommands** are *also* expected as `clap` will continue
+    /// parsing *values* until one of the following happens:
+    ///
+    /// - It reaches the maximum number of values
+    /// - It reaches a specific number of values
+    /// - It finds another flag or option (i.e. something that starts with a `-`)
+    /// - It reaches the [`Arg::value_terminator`] if set
+    ///
+    /// Alternatively,
+    /// - Use a delimiter between values with [Arg::value_delimiter]
+    /// - Require a flag occurrence per value with [`ArgAction::Append`]
+    /// - Require positional arguments to appear after `--` with [`Arg::last`]
+    ///
+    /// # Examples
+    ///
+    /// Option:
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("mode")
+    ///         .long("mode")
+    ///         .num_args(1))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--mode", "fast"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("mode").unwrap(), "fast");
+    /// ```
+    ///
+    /// Flag/option hybrid (see also [default_missing_value][Arg::default_missing_value])
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let cmd = Command::new("prog")
+    ///     .arg(Arg::new("mode")
+    ///         .long("mode")
+    ///         .default_missing_value("slow")
+    ///         .default_value("plaid")
+    ///         .num_args(0..=1));
+    ///
+    /// let m = cmd.clone()
+    ///     .get_matches_from(vec![
+    ///         "prog", "--mode", "fast"
+    ///     ]);
+    /// assert_eq!(m.get_one::<String>("mode").unwrap(), "fast");
+    ///
+    /// let m = cmd.clone()
+    ///     .get_matches_from(vec![
+    ///         "prog", "--mode",
+    ///     ]);
+    /// assert_eq!(m.get_one::<String>("mode").unwrap(), "slow");
+    ///
+    /// let m = cmd.clone()
+    ///     .get_matches_from(vec![
+    ///         "prog",
+    ///     ]);
+    /// assert_eq!(m.get_one::<String>("mode").unwrap(), "plaid");
+    /// ```
+    ///
+    /// Tuples
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let cmd = Command::new("prog")
+    ///     .arg(Arg::new("file")
+    ///         .action(ArgAction::Set)
+    ///         .num_args(2)
+    ///         .short('F'));
+    ///
+    /// let m = cmd.clone()
+    ///     .get_matches_from(vec![
+    ///         "prog", "-F", "in-file", "out-file"
+    ///     ]);
+    /// assert_eq!(
+    ///     m.get_many::<String>("file").unwrap_or_default().map(|v| v.as_str()).collect::<Vec<_>>(),
+    ///     vec!["in-file", "out-file"]
+    /// );
+    ///
+    /// let res = cmd.clone()
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "-F", "file1"
+    ///     ]);
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::WrongNumberOfValues);
+    /// ```
+    ///
+    /// A common mistake is to define an option which allows multiple values and a positional
+    /// argument.
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let cmd = Command::new("prog")
+    ///     .arg(Arg::new("file")
+    ///         .action(ArgAction::Set)
+    ///         .num_args(0..)
+    ///         .short('F'))
+    ///     .arg(Arg::new("word"));
+    ///
+    /// let m = cmd.clone().get_matches_from(vec![
+    ///     "prog", "-F", "file1", "file2", "file3", "word"
+    /// ]);
+    /// let files: Vec<_> = m.get_many::<String>("file").unwrap().collect();
+    /// assert_eq!(files, ["file1", "file2", "file3", "word"]); // wait...what?!
+    /// assert!(!m.contains_id("word")); // but we clearly used word!
+    ///
+    /// // but this works
+    /// let m = cmd.clone().get_matches_from(vec![
+    ///     "prog", "word", "-F", "file1", "file2", "file3",
+    /// ]);
+    /// let files: Vec<_> = m.get_many::<String>("file").unwrap().collect();
+    /// assert_eq!(files, ["file1", "file2", "file3"]);
+    /// assert_eq!(m.get_one::<String>("word").unwrap(), "word");
+    /// ```
+    /// The problem is `clap` doesn't know when to stop parsing values for "file".
+    ///
+    /// A solution for the example above is to limit how many values with a maximum, or specific
+    /// number, or to say [`ArgAction::Append`] is ok, but multiple values are not.
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("file")
+    ///         .action(ArgAction::Append)
+    ///         .short('F'))
+    ///     .arg(Arg::new("word"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "-F", "file1", "-F", "file2", "-F", "file3", "word"
+    ///     ]);
+    ///
+    /// let files: Vec<_> = m.get_many::<String>("file").unwrap().collect();
+    /// assert_eq!(files, ["file1", "file2", "file3"]);
+    /// assert_eq!(m.get_one::<String>("word").unwrap(), "word");
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn num_args(mut self, qty: impl IntoResettable<ValueRange>) -> Self {
+        self.num_vals = qty.into_resettable().into_option();
+        self
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::num_args`")
+    )]
+    pub fn number_of_values(self, qty: usize) -> Self {
+        self.num_args(qty)
+    }
+
+    /// Placeholder for the argument's value in the help message / usage.
+    ///
+    /// This name is cosmetic only; the name is **not** used to access arguments.
+    /// This setting can be very helpful when describing the type of input the user should be
+    /// using, such as `FILE`, `INTERFACE`, etc. Although not required, it's somewhat convention to
+    /// use all capital letters for the value name.
+    ///
+    /// **NOTE:** implicitly sets [`Arg::action(ArgAction::Set)`]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Arg::new("cfg")
+    ///     .long("config")
+    ///     .value_name("FILE")
+    /// # ;
+    /// ```
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # #[cfg(feature = "help")] {
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("config")
+    ///         .long("config")
+    ///         .value_name("FILE")
+    ///         .help("Some help text"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--help"
+    ///     ]);
+    /// # }
+    /// ```
+    /// Running the above program produces the following output
+    ///
+    /// ```text
+    /// valnames
+    ///
+    /// Usage: valnames [OPTIONS]
+    ///
+    /// Options:
+    ///     --config <FILE>     Some help text
+    ///     -h, --help          Print help information
+    ///     -V, --version       Print version information
+    /// ```
+    /// [positional]: Arg::index()
+    /// [`Arg::action(ArgAction::Set)`]: Arg::action()
+    #[inline]
+    #[must_use]
+    pub fn value_name(mut self, name: impl IntoResettable<Str>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            self.value_names([name])
+        } else {
+            self.val_names.clear();
+            self
+        }
+    }
+
+    /// Placeholders for the argument's values in the help message / usage.
+    ///
+    /// These names are cosmetic only, used for help and usage strings only. The names are **not**
+    /// used to access arguments. The values of the arguments are accessed in numeric order (i.e.
+    /// if you specify two names `one` and `two` `one` will be the first matched value, `two` will
+    /// be the second).
+    ///
+    /// This setting can be very helpful when describing the type of input the user should be
+    /// using, such as `FILE`, `INTERFACE`, etc. Although not required, it's somewhat convention to
+    /// use all capital letters for the value name.
+    ///
+    /// **Pro Tip:** It may help to use [`Arg::next_line_help(true)`] if there are long, or
+    /// multiple value names in order to not throw off the help text alignment of all options.
+    ///
+    /// **NOTE:** implicitly sets [`Arg::action(ArgAction::Set)`] and [`Arg::num_args(1..)`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Arg::new("speed")
+    ///     .short('s')
+    ///     .value_names(["fast", "slow"]);
+    /// ```
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # #[cfg(feature = "help")] {
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("io")
+    ///         .long("io-files")
+    ///         .value_names(["INFILE", "OUTFILE"]))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--help"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// Running the above program produces the following output
+    ///
+    /// ```text
+    /// valnames
+    ///
+    /// Usage: valnames [OPTIONS]
+    ///
+    /// Options:
+    ///     -h, --help                       Print help information
+    ///     --io-files <INFILE> <OUTFILE>    Some help text
+    ///     -V, --version                    Print version information
+    /// ```
+    /// [`Arg::next_line_help(true)`]: Arg::next_line_help()
+    /// [`Arg::num_args`]: Arg::num_args()
+    /// [`Arg::action(ArgAction::Set)`]: Arg::action()
+    /// [`Arg::num_args(1..)`]: Arg::num_args()
+    #[must_use]
+    pub fn value_names(mut self, names: impl IntoIterator<Item = impl Into<Str>>) -> Self {
+        self.val_names = names.into_iter().map(|s| s.into()).collect();
+        self
+    }
+
+    /// Provide the shell a hint about how to complete this argument.
+    ///
+    /// See [`ValueHint`] for more information.
+    ///
+    /// **NOTE:** implicitly sets [`Arg::action(ArgAction::Set)`].
+    ///
+    /// For example, to take a username as argument:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Arg, ValueHint};
+    /// Arg::new("user")
+    ///     .short('u')
+    ///     .long("user")
+    ///     .value_hint(ValueHint::Username);
+    /// ```
+    ///
+    /// To take a full command line and its arguments (for example, when writing a command wrapper):
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ValueHint, ArgAction};
+    /// Command::new("prog")
+    ///     .trailing_var_arg(true)
+    ///     .arg(
+    ///         Arg::new("command")
+    ///             .action(ArgAction::Set)
+    ///             .num_args(1..)
+    ///             .value_hint(ValueHint::CommandWithArguments)
+    ///     );
+    /// ```
+    #[must_use]
+    pub fn value_hint(mut self, value_hint: impl IntoResettable<ValueHint>) -> Self {
+        self.value_hint = value_hint.into_resettable().into_option();
+        self
+    }
+
+    /// Match values against [`PossibleValuesParser`][crate::builder::PossibleValuesParser] without matching case.
+    ///
+    /// When other arguments are conditionally required based on the
+    /// value of a case-insensitive argument, the equality check done
+    /// by [`Arg::required_if_eq`], [`Arg::required_if_eq_any`], or
+    /// [`Arg::required_if_eq_all`] is case-insensitive.
+    ///
+    ///
+    /// **NOTE:** Setting this requires [taking values][Arg::num_args]
+    ///
+    /// **NOTE:** To do unicode case folding, enable the `unicode` feature flag.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("pv")
+    ///     .arg(Arg::new("option")
+    ///         .long("option")
+    ///         .action(ArgAction::Set)
+    ///         .ignore_case(true)
+    ///         .value_parser(["test123"]))
+    ///     .get_matches_from(vec![
+    ///         "pv", "--option", "TeSt123",
+    ///     ]);
+    ///
+    /// assert!(m.get_one::<String>("option").unwrap().eq_ignore_ascii_case("test123"));
+    /// ```
+    ///
+    /// This setting also works when multiple values can be defined:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("pv")
+    ///     .arg(Arg::new("option")
+    ///         .short('o')
+    ///         .long("option")
+    ///         .action(ArgAction::Set)
+    ///         .ignore_case(true)
+    ///         .num_args(1..)
+    ///         .value_parser(["test123", "test321"]))
+    ///     .get_matches_from(vec![
+    ///         "pv", "--option", "TeSt123", "teST123", "tESt321"
+    ///     ]);
+    ///
+    /// let matched_vals = m.get_many::<String>("option").unwrap().collect::<Vec<_>>();
+    /// assert_eq!(&*matched_vals, &["TeSt123", "teST123", "tESt321"]);
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn ignore_case(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::IgnoreCase)
+        } else {
+            self.unset_setting(ArgSettings::IgnoreCase)
+        }
+    }
+
+    /// Allows values which start with a leading hyphen (`-`)
+    ///
+    /// To limit values to just numbers, see
+    /// [`allow_negative_numbers`][Arg::allow_negative_numbers].
+    ///
+    /// See also [`trailing_var_arg`][Arg::trailing_var_arg].
+    ///
+    /// **NOTE:** Setting this requires [taking values][Arg::num_args]
+    ///
+    /// **WARNING:** Prior arguments with `allow_hyphen_values(true)` get precedence over known
+    /// flags but known flags get precedence over the next possible positional argument with
+    /// `allow_hyphen_values(true)`.  When combined with [`Arg::num_args(..)`],
+    /// [`Arg::value_terminator`] is one way to ensure processing stops.
+    ///
+    /// **WARNING**: Take caution when using this setting combined with another argument using
+    /// [`Arg::num_args`], as this becomes ambiguous `$ prog --arg -- -- val`. All
+    /// three `--, --, val` will be values when the user may have thought the second `--` would
+    /// constitute the normal, "Only positional args follow" idiom.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("pat")
+    ///         .action(ArgAction::Set)
+    ///         .allow_hyphen_values(true)
+    ///         .long("pattern"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--pattern", "-file"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("pat").unwrap(), "-file");
+    /// ```
+    ///
+    /// Not setting `Arg::allow_hyphen_values(true)` and supplying a value which starts with a
+    /// hyphen is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("pat")
+    ///         .action(ArgAction::Set)
+    ///         .long("pattern"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--pattern", "-file"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::UnknownArgument);
+    /// ```
+    /// [`Arg::num_args(1)`]: Arg::num_args()
+    #[inline]
+    #[must_use]
+    pub fn allow_hyphen_values(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::AllowHyphenValues)
+        } else {
+            self.unset_setting(ArgSettings::AllowHyphenValues)
+        }
+    }
+
+    /// Allows negative numbers to pass as values.
+    ///
+    /// This is similar to [`Arg::allow_hyphen_values`] except that it only allows numbers,
+    /// all other undefined leading hyphens will fail to parse.
+    ///
+    /// **NOTE:** Setting this requires [taking values][Arg::num_args]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let res = Command::new("myprog")
+    ///     .arg(Arg::new("num").allow_negative_numbers(true))
+    ///     .try_get_matches_from(vec![
+    ///         "myprog", "-20"
+    ///     ]);
+    /// assert!(res.is_ok());
+    /// let m = res.unwrap();
+    /// assert_eq!(m.get_one::<String>("num").unwrap(), "-20");
+    /// ```
+    #[inline]
+    pub fn allow_negative_numbers(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::AllowNegativeNumbers)
+        } else {
+            self.unset_setting(ArgSettings::AllowNegativeNumbers)
+        }
+    }
+
+    /// Requires that options use the `--option=val` syntax
+    ///
+    /// i.e. an equals between the option and associated value.
+    ///
+    /// **NOTE:** Setting this requires [taking values][Arg::num_args]
+    ///
+    /// # Examples
+    ///
+    /// Setting `require_equals` requires that the option have an equals sign between
+    /// it and the associated value.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .require_equals(true)
+    ///         .long("config"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--config=file.conf"
+    ///     ]);
+    ///
+    /// assert!(res.is_ok());
+    /// ```
+    ///
+    /// Setting `require_equals` and *not* supplying the equals will cause an
+    /// error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .require_equals(true)
+    ///         .long("config"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--config", "file.conf"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::NoEquals);
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn require_equals(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::RequireEquals)
+        } else {
+            self.unset_setting(ArgSettings::RequireEquals)
+        }
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::value_delimiter`")
+    )]
+    pub fn use_value_delimiter(mut self, yes: bool) -> Self {
+        if yes {
+            self.val_delim.get_or_insert(',');
+        } else {
+            self.val_delim = None;
+        }
+        self
+    }
+
+    /// Allow grouping of multiple values via a delimiter.
+    ///
+    /// i.e. should `--option=val1,val2,val3` be parsed as three values (`val1`, `val2`,
+    /// and `val3`) or as a single value (`val1,val2,val3`). Defaults to using `,` (comma) as the
+    /// value delimiter for all arguments that accept values (options and positional arguments)
+    ///
+    /// **NOTE:** implicitly sets [`Arg::action(ArgAction::Set)`]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("config")
+    ///         .short('c')
+    ///         .long("config")
+    ///         .value_delimiter(','))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--config=val1,val2,val3"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_many::<String>("config").unwrap().collect::<Vec<_>>(), ["val1", "val2", "val3"])
+    /// ```
+    /// [`Arg::value_delimiter(',')`]: Arg::value_delimiter()
+    /// [`Arg::action(ArgAction::Set)`]: Arg::action()
+    #[inline]
+    #[must_use]
+    pub fn value_delimiter(mut self, d: impl IntoResettable<char>) -> Self {
+        self.val_delim = d.into_resettable().into_option();
+        self
+    }
+
+    /// Sentinel to **stop** parsing multiple values of a given argument.
+    ///
+    /// By default when
+    /// one sets [`num_args(1..)`] on an argument, clap will continue parsing values for that
+    /// argument until it reaches another valid argument, or one of the other more specific settings
+    /// for multiple values is used (such as [`num_args`]).
+    ///
+    /// **NOTE:** This setting only applies to [options] and [positional arguments]
+    ///
+    /// **NOTE:** When the terminator is passed in on the command line, it is **not** stored as one
+    /// of the values
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// Arg::new("vals")
+    ///     .action(ArgAction::Set)
+    ///     .num_args(1..)
+    ///     .value_terminator(";")
+    /// # ;
+    /// ```
+    ///
+    /// The following example uses two arguments, a sequence of commands, and the location in which
+    /// to perform them
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("cmds")
+    ///         .action(ArgAction::Set)
+    ///         .num_args(1..)
+    ///         .allow_hyphen_values(true)
+    ///         .value_terminator(";"))
+    ///     .arg(Arg::new("location"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "find", "-type", "f", "-name", "special", ";", "/home/clap"
+    ///     ]);
+    /// let cmds: Vec<_> = m.get_many::<String>("cmds").unwrap().collect();
+    /// assert_eq!(&cmds, &["find", "-type", "f", "-name", "special"]);
+    /// assert_eq!(m.get_one::<String>("location").unwrap(), "/home/clap");
+    /// ```
+    /// [options]: Arg::action
+    /// [positional arguments]: Arg::index()
+    /// [`num_args(1..)`]: Arg::num_args()
+    /// [`num_args`]: Arg::num_args()
+    #[inline]
+    #[must_use]
+    pub fn value_terminator(mut self, term: impl IntoResettable<Str>) -> Self {
+        self.terminator = term.into_resettable().into_option();
+        self
+    }
+
+    /// Consume all following arguments.
+    ///
+    /// Do not be parse them individually, but rather pass them in entirety.
+    ///
+    /// It is worth noting that setting this requires all values to come after a `--` to indicate
+    /// they should all be captured. For example:
+    ///
+    /// ```text
+    /// --foo something -- -v -v -v -b -b -b --baz -q -u -x
+    /// ```
+    ///
+    /// Will result in everything after `--` to be considered one raw argument. This behavior
+    /// may not be exactly what you are expecting and using [`Arg::trailing_var_arg`]
+    /// may be more appropriate.
+    ///
+    /// **NOTE:** Implicitly sets [`Arg::action(ArgAction::Set)`] [`Arg::num_args(1..)`],
+    /// [`Arg::allow_hyphen_values(true)`], and [`Arg::last(true)`] when set to `true`.
+    ///
+    /// [`Arg::action(ArgAction::Set)`]: Arg::action()
+    /// [`Arg::num_args(1..)`]: Arg::num_args()
+    /// [`Arg::allow_hyphen_values(true)`]: Arg::allow_hyphen_values()
+    /// [`Arg::last(true)`]: Arg::last()
+    #[inline]
+    #[must_use]
+    pub fn raw(mut self, yes: bool) -> Self {
+        if yes {
+            self.num_vals.get_or_insert_with(|| (1..).into());
+        }
+        self.allow_hyphen_values(yes).last(yes)
+    }
+
+    /// Value for the argument when not present.
+    ///
+    /// **NOTE:** If the user *does not* use this argument at runtime [`ArgMatches::contains_id`] will
+    /// still return `true`. If you wish to determine whether the argument was used at runtime or
+    /// not, consider [`ArgMatches::value_source`][crate::ArgMatches::value_source].
+    ///
+    /// **NOTE:** This setting is perfectly compatible with [`Arg::default_value_if`] but slightly
+    /// different. `Arg::default_value` *only* takes effect when the user has not provided this arg
+    /// at runtime. `Arg::default_value_if` however only takes effect when the user has not provided
+    /// a value at runtime **and** these other conditions are met as well. If you have set
+    /// `Arg::default_value` and `Arg::default_value_if`, and the user **did not** provide this arg
+    /// at runtime, nor were the conditions met for `Arg::default_value_if`, the `Arg::default_value`
+    /// will be applied.
+    ///
+    /// Like with command-line values, this will be split by [`Arg::value_delimiter`].
+    ///
+    /// # Examples
+    ///
+    /// First we use the default value without providing any value at runtime.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, parser::ValueSource};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("opt")
+    ///         .long("myopt")
+    ///         .default_value("myval"))
+    ///     .get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("opt").unwrap(), "myval");
+    /// assert!(m.contains_id("opt"));
+    /// assert_eq!(m.value_source("opt"), Some(ValueSource::DefaultValue));
+    /// ```
+    ///
+    /// Next we provide a value at runtime to override the default.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, parser::ValueSource};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("opt")
+    ///         .long("myopt")
+    ///         .default_value("myval"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--myopt=non_default"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("opt").unwrap(), "non_default");
+    /// assert!(m.contains_id("opt"));
+    /// assert_eq!(m.value_source("opt"), Some(ValueSource::CommandLine));
+    /// ```
+    /// [`Arg::action(ArgAction::Set)`]: Arg::action()
+    /// [`ArgMatches::contains_id`]: crate::ArgMatches::contains_id()
+    /// [`Arg::default_value_if`]: Arg::default_value_if()
+    #[inline]
+    #[must_use]
+    pub fn default_value(mut self, val: impl IntoResettable<OsStr>) -> Self {
+        if let Some(val) = val.into_resettable().into_option() {
+            self.default_values([val])
+        } else {
+            self.default_vals.clear();
+            self
+        }
+    }
+
+    #[inline]
+    #[must_use]
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::default_value`")
+    )]
+    pub fn default_value_os(self, val: impl Into<OsStr>) -> Self {
+        self.default_values([val])
+    }
+
+    /// Value for the argument when not present.
+    ///
+    /// See [`Arg::default_value`].
+    ///
+    /// [`Arg::default_value`]: Arg::default_value()
+    #[inline]
+    #[must_use]
+    pub fn default_values(mut self, vals: impl IntoIterator<Item = impl Into<OsStr>>) -> Self {
+        self.default_vals = vals.into_iter().map(|s| s.into()).collect();
+        self
+    }
+
+    #[inline]
+    #[must_use]
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::default_values`")
+    )]
+    pub fn default_values_os(self, vals: impl IntoIterator<Item = impl Into<OsStr>>) -> Self {
+        self.default_values(vals)
+    }
+
+    /// Value for the argument when the flag is present but no value is specified.
+    ///
+    /// This configuration option is often used to give the user a shortcut and allow them to
+    /// efficiently specify an option argument without requiring an explicitly value. The `--color`
+    /// argument is a common example. By, supplying an default, such as `default_missing_value("always")`,
+    /// the user can quickly just add `--color` to the command line to produce the desired color output.
+    ///
+    /// **NOTE:** using this configuration option requires the use of the
+    /// [`.num_args(0..N)`][Arg::num_args] and the
+    /// [`.require_equals(true)`][Arg::require_equals] configuration option. These are required in
+    /// order to unambiguously determine what, if any, value was supplied for the argument.
+    ///
+    /// Like with command-line values, this will be split by [`Arg::value_delimiter`].
+    ///
+    /// # Examples
+    ///
+    /// For POSIX style `--color`:
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, parser::ValueSource};
+    /// fn cli() -> Command {
+    ///     Command::new("prog")
+    ///         .arg(Arg::new("color").long("color")
+    ///             .value_name("WHEN")
+    ///             .value_parser(["always", "auto", "never"])
+    ///             .default_value("auto")
+    ///             .num_args(0..=1)
+    ///             .require_equals(true)
+    ///             .default_missing_value("always")
+    ///             .help("Specify WHEN to colorize output.")
+    ///         )
+    /// }
+    ///
+    /// // first, we'll provide no arguments
+    /// let m  = cli().get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    /// assert_eq!(m.get_one::<String>("color").unwrap(), "auto");
+    /// assert_eq!(m.value_source("color"), Some(ValueSource::DefaultValue));
+    ///
+    /// // next, we'll provide a runtime value to override the default (as usually done).
+    /// let m  = cli().get_matches_from(vec![
+    ///         "prog", "--color=never"
+    ///     ]);
+    /// assert_eq!(m.get_one::<String>("color").unwrap(), "never");
+    /// assert_eq!(m.value_source("color"), Some(ValueSource::CommandLine));
+    ///
+    /// // finally, we will use the shortcut and only provide the argument without a value.
+    /// let m  = cli().get_matches_from(vec![
+    ///         "prog", "--color"
+    ///     ]);
+    /// assert_eq!(m.get_one::<String>("color").unwrap(), "always");
+    /// assert_eq!(m.value_source("color"), Some(ValueSource::CommandLine));
+    /// ```
+    ///
+    /// For bool literals:
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, parser::ValueSource, value_parser};
+    /// fn cli() -> Command {
+    ///     Command::new("prog")
+    ///         .arg(Arg::new("create").long("create")
+    ///             .value_name("BOOL")
+    ///             .value_parser(value_parser!(bool))
+    ///             .num_args(0..=1)
+    ///             .require_equals(true)
+    ///             .default_missing_value("true")
+    ///         )
+    /// }
+    ///
+    /// // first, we'll provide no arguments
+    /// let m  = cli().get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    /// assert_eq!(m.get_one::<bool>("create").copied(), None);
+    ///
+    /// // next, we'll provide a runtime value to override the default (as usually done).
+    /// let m  = cli().get_matches_from(vec![
+    ///         "prog", "--create=false"
+    ///     ]);
+    /// assert_eq!(m.get_one::<bool>("create").copied(), Some(false));
+    /// assert_eq!(m.value_source("create"), Some(ValueSource::CommandLine));
+    ///
+    /// // finally, we will use the shortcut and only provide the argument without a value.
+    /// let m  = cli().get_matches_from(vec![
+    ///         "prog", "--create"
+    ///     ]);
+    /// assert_eq!(m.get_one::<bool>("create").copied(), Some(true));
+    /// assert_eq!(m.value_source("create"), Some(ValueSource::CommandLine));
+    /// ```
+    ///
+    /// [`Arg::action(ArgAction::Set)`]: Arg::action()
+    /// [`Arg::default_value`]: Arg::default_value()
+    #[inline]
+    #[must_use]
+    pub fn default_missing_value(mut self, val: impl IntoResettable<OsStr>) -> Self {
+        if let Some(val) = val.into_resettable().into_option() {
+            self.default_missing_values_os([val])
+        } else {
+            self.default_missing_vals.clear();
+            self
+        }
+    }
+
+    /// Value for the argument when the flag is present but no value is specified.
+    ///
+    /// See [`Arg::default_missing_value`].
+    ///
+    /// [`Arg::default_missing_value`]: Arg::default_missing_value()
+    /// [`OsStr`]: std::ffi::OsStr
+    #[inline]
+    #[must_use]
+    pub fn default_missing_value_os(self, val: impl Into<OsStr>) -> Self {
+        self.default_missing_values_os([val])
+    }
+
+    /// Value for the argument when the flag is present but no value is specified.
+    ///
+    /// See [`Arg::default_missing_value`].
+    ///
+    /// [`Arg::default_missing_value`]: Arg::default_missing_value()
+    #[inline]
+    #[must_use]
+    pub fn default_missing_values(self, vals: impl IntoIterator<Item = impl Into<OsStr>>) -> Self {
+        self.default_missing_values_os(vals)
+    }
+
+    /// Value for the argument when the flag is present but no value is specified.
+    ///
+    /// See [`Arg::default_missing_values`].
+    ///
+    /// [`Arg::default_missing_values`]: Arg::default_missing_values()
+    /// [`OsStr`]: std::ffi::OsStr
+    #[inline]
+    #[must_use]
+    pub fn default_missing_values_os(
+        mut self,
+        vals: impl IntoIterator<Item = impl Into<OsStr>>,
+    ) -> Self {
+        self.default_missing_vals = vals.into_iter().map(|s| s.into()).collect();
+        self
+    }
+
+    /// Read from `name` environment variable when argument is not present.
+    ///
+    /// If it is not present in the environment, then default
+    /// rules will apply.
+    ///
+    /// If user sets the argument in the environment:
+    /// - When [`Arg::action(ArgAction::Set)`] is not set, the flag is considered raised.
+    /// - When [`Arg::action(ArgAction::Set)`] is set,
+    ///   [`ArgMatches::get_one`][crate::ArgMatches::get_one] will
+    ///   return value of the environment variable.
+    ///
+    /// If user doesn't set the argument in the environment:
+    /// - When [`Arg::action(ArgAction::Set)`] is not set, the flag is considered off.
+    /// - When [`Arg::action(ArgAction::Set)`] is set,
+    ///   [`ArgMatches::get_one`][crate::ArgMatches::get_one] will
+    ///   return the default specified.
+    ///
+    /// Like with command-line values, this will be split by [`Arg::value_delimiter`].
+    ///
+    /// # Examples
+    ///
+    /// In this example, we show the variable coming from the environment:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use std::env;
+    /// # use clap::{Command, Arg, ArgAction};
+    ///
+    /// env::set_var("MY_FLAG", "env");
+    ///
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("flag")
+    ///         .long("flag")
+    ///         .env("MY_FLAG")
+    ///         .action(ArgAction::Set))
+    ///     .get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("flag").unwrap(), "env");
+    /// ```
+    ///
+    /// In this example, because `prog` is a flag that accepts an optional, case-insensitive
+    /// boolean literal.
+    ///
+    /// Note that the value parser controls how flags are parsed.  In this case we've selected
+    /// [`FalseyValueParser`][crate::builder::FalseyValueParser].  A `false` literal is `n`, `no`,
+    /// `f`, `false`, `off` or `0`.  An absent environment variable will also be considered as
+    /// `false`.  Anything else will considered as `true`.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use std::env;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// # use clap::builder::FalseyValueParser;
+    ///
+    /// env::set_var("TRUE_FLAG", "true");
+    /// env::set_var("FALSE_FLAG", "0");
+    ///
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("true_flag")
+    ///         .long("true_flag")
+    ///         .action(ArgAction::SetTrue)
+    ///         .value_parser(FalseyValueParser::new())
+    ///         .env("TRUE_FLAG"))
+    ///     .arg(Arg::new("false_flag")
+    ///         .long("false_flag")
+    ///         .action(ArgAction::SetTrue)
+    ///         .value_parser(FalseyValueParser::new())
+    ///         .env("FALSE_FLAG"))
+    ///     .arg(Arg::new("absent_flag")
+    ///         .long("absent_flag")
+    ///         .action(ArgAction::SetTrue)
+    ///         .value_parser(FalseyValueParser::new())
+    ///         .env("ABSENT_FLAG"))
+    ///     .get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert!(m.get_flag("true_flag"));
+    /// assert!(!m.get_flag("false_flag"));
+    /// assert!(!m.get_flag("absent_flag"));
+    /// ```
+    ///
+    /// In this example, we show the variable coming from an option on the CLI:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use std::env;
+    /// # use clap::{Command, Arg, ArgAction};
+    ///
+    /// env::set_var("MY_FLAG", "env");
+    ///
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("flag")
+    ///         .long("flag")
+    ///         .env("MY_FLAG")
+    ///         .action(ArgAction::Set))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--flag", "opt"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("flag").unwrap(), "opt");
+    /// ```
+    ///
+    /// In this example, we show the variable coming from the environment even with the
+    /// presence of a default:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use std::env;
+    /// # use clap::{Command, Arg, ArgAction};
+    ///
+    /// env::set_var("MY_FLAG", "env");
+    ///
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("flag")
+    ///         .long("flag")
+    ///         .env("MY_FLAG")
+    ///         .action(ArgAction::Set)
+    ///         .default_value("default"))
+    ///     .get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("flag").unwrap(), "env");
+    /// ```
+    ///
+    /// In this example, we show the use of multiple values in a single environment variable:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use std::env;
+    /// # use clap::{Command, Arg, ArgAction};
+    ///
+    /// env::set_var("MY_FLAG_MULTI", "env1,env2");
+    ///
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("flag")
+    ///         .long("flag")
+    ///         .env("MY_FLAG_MULTI")
+    ///         .action(ArgAction::Set)
+    ///         .num_args(1..)
+    ///         .value_delimiter(','))
+    ///     .get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_many::<String>("flag").unwrap().collect::<Vec<_>>(), vec!["env1", "env2"]);
+    /// ```
+    /// [`Arg::action(ArgAction::Set)`]: Arg::action()
+    /// [`Arg::value_delimiter(',')`]: Arg::value_delimiter()
+    #[cfg(feature = "env")]
+    #[inline]
+    #[must_use]
+    pub fn env(mut self, name: impl IntoResettable<OsStr>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            let value = env::var_os(&name);
+            self.env = Some((name, value));
+        } else {
+            self.env = None;
+        }
+        self
+    }
+
+    #[cfg(feature = "env")]
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::env`")
+    )]
+    pub fn env_os(self, name: impl Into<OsStr>) -> Self {
+        self.env(name)
+    }
+}
+
+/// # Help
+impl Arg {
+    /// Sets the description of the argument for short help (`-h`).
+    ///
+    /// Typically, this is a short (one line) description of the arg.
+    ///
+    /// If [`Arg::long_help`] is not specified, this message will be displayed for `--help`.
+    ///
+    /// **NOTE:** Only `Arg::help` is used in completion script generation in order to be concise
+    ///
+    /// # Examples
+    ///
+    /// Any valid UTF-8 is allowed in the help text. The one exception is when one wishes to
+    /// include a newline in the help text and have the following text be properly aligned with all
+    /// the other help text.
+    ///
+    /// Setting `help` displays a short message to the side of the argument when the user passes
+    /// `-h` or `--help` (by default).
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .long("config")
+    ///         .help("Some help text describing the --config arg"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--help"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// The above example displays
+    ///
+    /// ```notrust
+    /// helptest
+    ///
+    /// Usage: helptest [OPTIONS]
+    ///
+    /// Options:
+    ///     --config     Some help text describing the --config arg
+    /// -h, --help       Print help information
+    /// -V, --version    Print version information
+    /// ```
+    /// [`Arg::long_help`]: Arg::long_help()
+    #[inline]
+    #[must_use]
+    pub fn help(mut self, h: impl IntoResettable<StyledStr>) -> Self {
+        self.help = h.into_resettable().into_option();
+        self
+    }
+
+    /// Sets the description of the argument for long help (`--help`).
+    ///
+    /// Typically this a more detailed (multi-line) message
+    /// that describes the arg.
+    ///
+    /// If [`Arg::help`] is not specified, this message will be displayed for `-h`.
+    ///
+    /// **NOTE:** Only [`Arg::help`] is used in completion script generation in order to be concise
+    ///
+    /// # Examples
+    ///
+    /// Any valid UTF-8 is allowed in the help text. The one exception is when one wishes to
+    /// include a newline in the help text and have the following text be properly aligned with all
+    /// the other help text.
+    ///
+    /// Setting `help` displays a short message to the side of the argument when the user passes
+    /// `-h` or `--help` (by default).
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .long("config")
+    ///         .long_help(
+    /// "The config file used by the myprog must be in JSON format
+    /// with only valid keys and may not contain other nonsense
+    /// that cannot be read by this program. Obviously I'm going on
+    /// and on, so I'll stop now."))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--help"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// The above example displays
+    ///
+    /// ```text
+    /// prog
+    ///
+    /// Usage: prog [OPTIONS]
+    ///
+    /// Options:
+    ///         --config
+    ///             The config file used by the myprog must be in JSON format
+    ///             with only valid keys and may not contain other nonsense
+    ///             that cannot be read by this program. Obviously I'm going on
+    ///             and on, so I'll stop now.
+    ///
+    ///     -h, --help
+    ///             Print help information
+    ///
+    ///     -V, --version
+    ///             Print version information
+    /// ```
+    /// [`Arg::help`]: Arg::help()
+    #[inline]
+    #[must_use]
+    pub fn long_help(mut self, h: impl IntoResettable<StyledStr>) -> Self {
+        self.long_help = h.into_resettable().into_option();
+        self
+    }
+
+    /// Allows custom ordering of args within the help message.
+    ///
+    /// `Arg`s with a lower value will be displayed first in the help message.
+    /// Those with the same display order will be sorted.
+    ///
+    /// `Arg`s are automatically assigned a display order based on the order they are added to the
+    /// [`Command`][crate::Command].
+    /// Overriding this is helpful when the order arguments are added in isn't the same as the
+    /// display order, whether in one-off cases or to automatically sort arguments.
+    ///
+    /// To change, see [`Command::next_display_order`][crate::Command::next_display_order].
+    ///
+    /// **NOTE:** This setting is ignored for [positional arguments] which are always displayed in
+    /// [index] order.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("boat")
+    ///         .short('b')
+    ///         .long("boat")
+    ///         .action(ArgAction::Set)
+    ///         .display_order(0)  // Sort
+    ///         .help("Some help and text"))
+    ///     .arg(Arg::new("airplane")
+    ///         .short('a')
+    ///         .long("airplane")
+    ///         .action(ArgAction::Set)
+    ///         .display_order(0)  // Sort
+    ///         .help("I should be first!"))
+    ///     .arg(Arg::new("custom-help")
+    ///         .short('?')
+    ///         .action(ArgAction::Help)
+    ///         .display_order(100)  // Don't sort
+    ///         .help("Alt help"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--help"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// The above example displays the following help message
+    ///
+    /// ```text
+    /// cust-ord
+    ///
+    /// Usage: cust-ord [OPTIONS]
+    ///
+    /// Options:
+    ///     -a, --airplane <airplane>    I should be first!
+    ///     -b, --boat <boar>            Some help and text
+    ///     -h, --help                   Print help information
+    ///     -?                           Alt help
+    /// ```
+    /// [positional arguments]: Arg::index()
+    /// [index]: Arg::index()
+    #[inline]
+    #[must_use]
+    pub fn display_order(mut self, ord: impl IntoResettable<usize>) -> Self {
+        self.disp_ord = ord.into_resettable().into_option();
+        self
+    }
+
+    /// Override the [current] help section.
+    ///
+    /// [current]: crate::Command::next_help_heading
+    #[inline]
+    #[must_use]
+    pub fn help_heading(mut self, heading: impl IntoResettable<Str>) -> Self {
+        self.help_heading = Some(heading.into_resettable().into_option());
+        self
+    }
+
+    /// Render the [help][Arg::help] on the line after the argument.
+    ///
+    /// This can be helpful for arguments with very long or complex help messages.
+    /// This can also be helpful for arguments with very long flag names, or many/long value names.
+    ///
+    /// **NOTE:** To apply this setting to all arguments and subcommands, consider using
+    /// [`crate::Command::next_line_help`]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("opt")
+    ///         .long("long-option-flag")
+    ///         .short('o')
+    ///         .action(ArgAction::Set)
+    ///         .next_line_help(true)
+    ///         .value_names(["value1", "value2"])
+    ///         .help("Some really long help and complex\n\
+    ///                help that makes more sense to be\n\
+    ///                on a line after the option"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--help"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// The above example displays the following help message
+    ///
+    /// ```text
+    /// nlh
+    ///
+    /// Usage: nlh [OPTIONS]
+    ///
+    /// Options:
+    ///     -h, --help       Print help information
+    ///     -V, --version    Print version information
+    ///     -o, --long-option-flag <value1> <value2>
+    ///         Some really long help and complex
+    ///         help that makes more sense to be
+    ///         on a line after the option
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn next_line_help(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::NextLineHelp)
+        } else {
+            self.unset_setting(ArgSettings::NextLineHelp)
+        }
+    }
+
+    /// Do not display the argument in help message.
+    ///
+    /// **NOTE:** This does **not** hide the argument from usage strings on error
+    ///
+    /// # Examples
+    ///
+    /// Setting `Hidden` will hide the argument when displaying help text
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .long("config")
+    ///         .hide(true)
+    ///         .help("Some help text describing the --config arg"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--help"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// The above example displays
+    ///
+    /// ```text
+    /// helptest
+    ///
+    /// Usage: helptest [OPTIONS]
+    ///
+    /// Options:
+    /// -h, --help       Print help information
+    /// -V, --version    Print version information
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn hide(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::Hidden)
+        } else {
+            self.unset_setting(ArgSettings::Hidden)
+        }
+    }
+
+    /// Do not display the [possible values][crate::builder::ValueParser::possible_values] in the help message.
+    ///
+    /// This is useful for args with many values, or ones which are explained elsewhere in the
+    /// help text.
+    ///
+    /// **NOTE:** Setting this requires [taking values][Arg::num_args]
+    ///
+    /// To set this for all arguments, see
+    /// [`Command::hide_possible_values`][crate::Command::hide_possible_values].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("mode")
+    ///         .long("mode")
+    ///         .value_parser(["fast", "slow"])
+    ///         .action(ArgAction::Set)
+    ///         .hide_possible_values(true));
+    /// ```
+    /// If we were to run the above program with `--help` the `[values: fast, slow]` portion of
+    /// the help text would be omitted.
+    #[inline]
+    #[must_use]
+    pub fn hide_possible_values(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::HidePossibleValues)
+        } else {
+            self.unset_setting(ArgSettings::HidePossibleValues)
+        }
+    }
+
+    /// Do not display the default value of the argument in the help message.
+    ///
+    /// This is useful when default behavior of an arg is explained elsewhere in the help text.
+    ///
+    /// **NOTE:** Setting this requires [taking values][Arg::num_args]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("connect")
+    ///     .arg(Arg::new("host")
+    ///         .long("host")
+    ///         .default_value("localhost")
+    ///         .action(ArgAction::Set)
+    ///         .hide_default_value(true));
+    ///
+    /// ```
+    ///
+    /// If we were to run the above program with `--help` the `[default: localhost]` portion of
+    /// the help text would be omitted.
+    #[inline]
+    #[must_use]
+    pub fn hide_default_value(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::HideDefaultValue)
+        } else {
+            self.unset_setting(ArgSettings::HideDefaultValue)
+        }
+    }
+
+    /// Do not display in help the environment variable name.
+    ///
+    /// This is useful when the variable option is explained elsewhere in the help text.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("mode")
+    ///         .long("mode")
+    ///         .env("MODE")
+    ///         .action(ArgAction::Set)
+    ///         .hide_env(true));
+    /// ```
+    ///
+    /// If we were to run the above program with `--help` the `[env: MODE]` portion of the help
+    /// text would be omitted.
+    #[cfg(feature = "env")]
+    #[inline]
+    #[must_use]
+    pub fn hide_env(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::HideEnv)
+        } else {
+            self.unset_setting(ArgSettings::HideEnv)
+        }
+    }
+
+    /// Do not display in help any values inside the associated ENV variables for the argument.
+    ///
+    /// This is useful when ENV vars contain sensitive values.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("connect")
+    ///     .arg(Arg::new("host")
+    ///         .long("host")
+    ///         .env("CONNECT")
+    ///         .action(ArgAction::Set)
+    ///         .hide_env_values(true));
+    ///
+    /// ```
+    ///
+    /// If we were to run the above program with `$ CONNECT=super_secret connect --help` the
+    /// `[default: CONNECT=super_secret]` portion of the help text would be omitted.
+    #[cfg(feature = "env")]
+    #[inline]
+    #[must_use]
+    pub fn hide_env_values(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::HideEnvValues)
+        } else {
+            self.unset_setting(ArgSettings::HideEnvValues)
+        }
+    }
+
+    /// Hides an argument from short help (`-h`).
+    ///
+    /// **NOTE:** This does **not** hide the argument from usage strings on error
+    ///
+    /// **NOTE:** Setting this option will cause next-line-help output style to be used
+    /// when long help (`--help`) is called.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Arg::new("debug")
+    ///     .hide_short_help(true);
+    /// ```
+    ///
+    /// Setting `hide_short_help(true)` will hide the argument when displaying short help text
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .long("config")
+    ///         .hide_short_help(true)
+    ///         .help("Some help text describing the --config arg"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "-h"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// The above example displays
+    ///
+    /// ```text
+    /// helptest
+    ///
+    /// Usage: helptest [OPTIONS]
+    ///
+    /// Options:
+    /// -h, --help       Print help information
+    /// -V, --version    Print version information
+    /// ```
+    ///
+    /// However, when --help is called
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .long("config")
+    ///         .hide_short_help(true)
+    ///         .help("Some help text describing the --config arg"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--help"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// Then the following would be displayed
+    ///
+    /// ```text
+    /// helptest
+    ///
+    /// Usage: helptest [OPTIONS]
+    ///
+    /// Options:
+    ///     --config     Some help text describing the --config arg
+    /// -h, --help       Print help information
+    /// -V, --version    Print version information
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn hide_short_help(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::HiddenShortHelp)
+        } else {
+            self.unset_setting(ArgSettings::HiddenShortHelp)
+        }
+    }
+
+    /// Hides an argument from long help (`--help`).
+    ///
+    /// **NOTE:** This does **not** hide the argument from usage strings on error
+    ///
+    /// **NOTE:** Setting this option will cause next-line-help output style to be used
+    /// when long help (`--help`) is called.
+    ///
+    /// # Examples
+    ///
+    /// Setting `hide_long_help(true)` will hide the argument when displaying long help text
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .long("config")
+    ///         .hide_long_help(true)
+    ///         .help("Some help text describing the --config arg"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--help"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// The above example displays
+    ///
+    /// ```text
+    /// helptest
+    ///
+    /// Usage: helptest [OPTIONS]
+    ///
+    /// Options:
+    /// -h, --help       Print help information
+    /// -V, --version    Print version information
+    /// ```
+    ///
+    /// However, when -h is called
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .long("config")
+    ///         .hide_long_help(true)
+    ///         .help("Some help text describing the --config arg"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "-h"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// Then the following would be displayed
+    ///
+    /// ```text
+    /// helptest
+    ///
+    /// Usage: helptest [OPTIONS]
+    ///
+    /// OPTIONS:
+    ///     --config     Some help text describing the --config arg
+    /// -h, --help       Print help information
+    /// -V, --version    Print version information
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn hide_long_help(self, yes: bool) -> Self {
+        if yes {
+            self.setting(ArgSettings::HiddenLongHelp)
+        } else {
+            self.unset_setting(ArgSettings::HiddenLongHelp)
+        }
+    }
+}
+
+/// # Advanced Argument Relations
+impl Arg {
+    /// The name of the [`ArgGroup`] the argument belongs to.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// Arg::new("debug")
+    ///     .long("debug")
+    ///     .action(ArgAction::SetTrue)
+    ///     .group("mode")
+    /// # ;
+    /// ```
+    ///
+    /// Multiple arguments can be a member of a single group and then the group checked as if it
+    /// was one of said arguments.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("debug")
+    ///         .long("debug")
+    ///         .action(ArgAction::SetTrue)
+    ///         .group("mode"))
+    ///     .arg(Arg::new("verbose")
+    ///         .long("verbose")
+    ///         .action(ArgAction::SetTrue)
+    ///         .group("mode"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--debug"
+    ///     ]);
+    /// assert!(m.contains_id("mode"));
+    /// ```
+    ///
+    /// [`ArgGroup`]: crate::ArgGroup
+    #[must_use]
+    pub fn group(mut self, group_id: impl IntoResettable<Id>) -> Self {
+        if let Some(group_id) = group_id.into_resettable().into_option() {
+            self.groups.push(group_id);
+        } else {
+            self.groups.clear();
+        }
+        self
+    }
+
+    /// The names of [`ArgGroup`]'s the argument belongs to.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// Arg::new("debug")
+    ///     .long("debug")
+    ///     .action(ArgAction::SetTrue)
+    ///     .groups(["mode", "verbosity"])
+    /// # ;
+    /// ```
+    ///
+    /// Arguments can be members of multiple groups and then the group checked as if it
+    /// was one of said arguments.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("debug")
+    ///         .long("debug")
+    ///         .action(ArgAction::SetTrue)
+    ///         .groups(["mode", "verbosity"]))
+    ///     .arg(Arg::new("verbose")
+    ///         .long("verbose")
+    ///         .action(ArgAction::SetTrue)
+    ///         .groups(["mode", "verbosity"]))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--debug"
+    ///     ]);
+    /// assert!(m.contains_id("mode"));
+    /// assert!(m.contains_id("verbosity"));
+    /// ```
+    ///
+    /// [`ArgGroup`]: crate::ArgGroup
+    #[must_use]
+    pub fn groups(mut self, group_ids: impl IntoIterator<Item = impl Into<Id>>) -> Self {
+        self.groups.extend(group_ids.into_iter().map(Into::into));
+        self
+    }
+
+    /// Specifies the value of the argument if `arg` has been used at runtime.
+    ///
+    /// If `default` is set to `None`, `default_value` will be removed.
+    ///
+    /// **NOTE:** This setting is perfectly compatible with [`Arg::default_value`] but slightly
+    /// different. `Arg::default_value` *only* takes effect when the user has not provided this arg
+    /// at runtime. This setting however only takes effect when the user has not provided a value at
+    /// runtime **and** these other conditions are met as well. If you have set `Arg::default_value`
+    /// and `Arg::default_value_if`, and the user **did not** provide this arg at runtime, nor were
+    /// the conditions met for `Arg::default_value_if`, the `Arg::default_value` will be applied.
+    ///
+    /// Like with command-line values, this will be split by [`Arg::value_delimiter`].
+    ///
+    /// # Examples
+    ///
+    /// First we use the default value only if another arg is present at runtime.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// # use clap::builder::{ArgPredicate};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("flag")
+    ///         .long("flag")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .default_value_if("flag", ArgPredicate::IsPresent, Some("default")))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--flag"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("other").unwrap(), "default");
+    /// ```
+    ///
+    /// Next we run the same test, but without providing `--flag`.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("flag")
+    ///         .long("flag")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .default_value_if("flag", "true", Some("default")))
+    ///     .get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("other"), None);
+    /// ```
+    ///
+    /// Now lets only use the default value if `--opt` contains the value `special`.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("opt")
+    ///         .action(ArgAction::Set)
+    ///         .long("opt"))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .default_value_if("opt", "special", Some("default")))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--opt", "special"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("other").unwrap(), "default");
+    /// ```
+    ///
+    /// We can run the same test and provide any value *other than* `special` and we won't get a
+    /// default value.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("opt")
+    ///         .action(ArgAction::Set)
+    ///         .long("opt"))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .default_value_if("opt", "special", Some("default")))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--opt", "hahaha"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("other"), None);
+    /// ```
+    ///
+    /// If we want to unset the default value for an Arg based on the presence or
+    /// value of some other Arg.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("flag")
+    ///         .long("flag")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .default_value("default")
+    ///         .default_value_if("flag", "true", None))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--flag"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("other"), None);
+    /// ```
+    /// [`Arg::action(ArgAction::Set)`]: Arg::action()
+    /// [`Arg::default_value`]: Arg::default_value()
+    #[must_use]
+    pub fn default_value_if(
+        mut self,
+        arg_id: impl Into<Id>,
+        predicate: impl Into<ArgPredicate>,
+        default: impl IntoResettable<OsStr>,
+    ) -> Self {
+        self.default_vals_ifs.push((
+            arg_id.into(),
+            predicate.into(),
+            default.into_resettable().into_option(),
+        ));
+        self
+    }
+
+    #[must_use]
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::default_value_if`")
+    )]
+    pub fn default_value_if_os(
+        self,
+        arg_id: impl Into<Id>,
+        predicate: impl Into<ArgPredicate>,
+        default: impl IntoResettable<OsStr>,
+    ) -> Self {
+        self.default_value_if(arg_id, predicate, default)
+    }
+
+    /// Specifies multiple values and conditions in the same manner as [`Arg::default_value_if`].
+    ///
+    /// The method takes a slice of tuples in the `(arg, predicate, default)` format.
+    ///
+    /// **NOTE**: The conditions are stored in order and evaluated in the same order. I.e. the first
+    /// if multiple conditions are true, the first one found will be applied and the ultimate value.
+    ///
+    /// Like with command-line values, this will be split by [`Arg::value_delimiter`].
+    ///
+    /// # Examples
+    ///
+    /// First we use the default value only if another arg is present at runtime.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("flag")
+    ///         .long("flag")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("opt")
+    ///         .long("opt")
+    ///         .action(ArgAction::Set))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .default_value_ifs([
+    ///             ("flag", "true", Some("default")),
+    ///             ("opt", "channal", Some("chan")),
+    ///         ]))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--opt", "channal"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("other").unwrap(), "chan");
+    /// ```
+    ///
+    /// Next we run the same test, but without providing `--flag`.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("flag")
+    ///         .long("flag")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .default_value_ifs([
+    ///             ("flag", "true", Some("default")),
+    ///             ("opt", "channal", Some("chan")),
+    ///         ]))
+    ///     .get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("other"), None);
+    /// ```
+    ///
+    /// We can also see that these values are applied in order, and if more than one condition is
+    /// true, only the first evaluated "wins"
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// # use clap::builder::ArgPredicate;
+    /// let m = Command::new("prog")
+    ///     .arg(Arg::new("flag")
+    ///         .long("flag")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("opt")
+    ///         .long("opt")
+    ///         .action(ArgAction::Set))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .default_value_ifs([
+    ///             ("flag", ArgPredicate::IsPresent, Some("default")),
+    ///             ("opt", ArgPredicate::Equals("channal".into()), Some("chan")),
+    ///         ]))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--opt", "channal", "--flag"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("other").unwrap(), "default");
+    /// ```
+    /// [`Arg::action(ArgAction::Set)`]: Arg::action()
+    /// [`Arg::default_value_if`]: Arg::default_value_if()
+    #[must_use]
+    pub fn default_value_ifs(
+        mut self,
+        ifs: impl IntoIterator<
+            Item = (
+                impl Into<Id>,
+                impl Into<ArgPredicate>,
+                impl IntoResettable<OsStr>,
+            ),
+        >,
+    ) -> Self {
+        for (arg, predicate, default) in ifs {
+            self = self.default_value_if(arg, predicate, default);
+        }
+        self
+    }
+
+    #[must_use]
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::default_value_ifs`")
+    )]
+    pub fn default_value_ifs_os(
+        self,
+        ifs: impl IntoIterator<
+            Item = (
+                impl Into<Id>,
+                impl Into<ArgPredicate>,
+                impl IntoResettable<OsStr>,
+            ),
+        >,
+    ) -> Self {
+        self.default_value_ifs(ifs)
+    }
+
+    /// Set this arg as [required] as long as the specified argument is not present at runtime.
+    ///
+    /// **Pro Tip:** Using `Arg::required_unless_present` implies [`Arg::required`] and is therefore not
+    /// mandatory to also set.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .required_unless_present("debug")
+    /// # ;
+    /// ```
+    ///
+    /// In the following example, the required argument is *not* provided,
+    /// but it's not an error because the `unless` arg has been supplied.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required_unless_present("dbg")
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .arg(Arg::new("dbg")
+    ///         .long("debug")
+    ///         .action(ArgAction::SetTrue))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--debug"
+    ///     ]);
+    ///
+    /// assert!(res.is_ok());
+    /// ```
+    ///
+    /// Setting `Arg::required_unless_present(name)` and *not* supplying `name` or this arg is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required_unless_present("dbg")
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .arg(Arg::new("dbg")
+    ///         .long("debug"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    /// [required]: Arg::required()
+    #[must_use]
+    pub fn required_unless_present(mut self, arg_id: impl IntoResettable<Id>) -> Self {
+        if let Some(arg_id) = arg_id.into_resettable().into_option() {
+            self.r_unless.push(arg_id);
+        } else {
+            self.r_unless.clear();
+        }
+        self
+    }
+
+    /// Sets this arg as [required] unless *all* of the specified arguments are present at runtime.
+    ///
+    /// In other words, parsing will succeed only if user either
+    /// * supplies the `self` arg.
+    /// * supplies *all* of the `names` arguments.
+    ///
+    /// **NOTE:** If you wish for this argument to only be required unless *any of* these args are
+    /// present see [`Arg::required_unless_present_any`]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .required_unless_present_all(["cfg", "dbg"])
+    /// # ;
+    /// ```
+    ///
+    /// In the following example, the required argument is *not* provided, but it's not an error
+    /// because *all* of the `names` args have been supplied.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required_unless_present_all(["dbg", "infile"])
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .arg(Arg::new("dbg")
+    ///         .long("debug")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("infile")
+    ///         .short('i')
+    ///         .action(ArgAction::Set))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--debug", "-i", "file"
+    ///     ]);
+    ///
+    /// assert!(res.is_ok());
+    /// ```
+    ///
+    /// Setting [`Arg::required_unless_present_all(names)`] and *not* supplying
+    /// either *all* of `unless` args or the `self` arg is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required_unless_present_all(["dbg", "infile"])
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .arg(Arg::new("dbg")
+    ///         .long("debug")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("infile")
+    ///         .short('i')
+    ///         .action(ArgAction::Set))
+    ///     .try_get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    /// [required]: Arg::required()
+    /// [`Arg::required_unless_present_any`]: Arg::required_unless_present_any()
+    /// [`Arg::required_unless_present_all(names)`]: Arg::required_unless_present_all()
+    #[must_use]
+    pub fn required_unless_present_all(
+        mut self,
+        names: impl IntoIterator<Item = impl Into<Id>>,
+    ) -> Self {
+        self.r_unless_all.extend(names.into_iter().map(Into::into));
+        self
+    }
+
+    /// Sets this arg as [required] unless *any* of the specified arguments are present at runtime.
+    ///
+    /// In other words, parsing will succeed only if user either
+    /// * supplies the `self` arg.
+    /// * supplies *one or more* of the `unless` arguments.
+    ///
+    /// **NOTE:** If you wish for this argument to be required unless *all of* these args are
+    /// present see [`Arg::required_unless_present_all`]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .required_unless_present_any(["cfg", "dbg"])
+    /// # ;
+    /// ```
+    ///
+    /// Setting [`Arg::required_unless_present_any(names)`] requires that the argument be used at runtime
+    /// *unless* *at least one of* the args in `names` are present. In the following example, the
+    /// required argument is *not* provided, but it's not an error because one the `unless` args
+    /// have been supplied.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required_unless_present_any(["dbg", "infile"])
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .arg(Arg::new("dbg")
+    ///         .long("debug")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("infile")
+    ///         .short('i')
+    ///         .action(ArgAction::Set))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--debug"
+    ///     ]);
+    ///
+    /// assert!(res.is_ok());
+    /// ```
+    ///
+    /// Setting [`Arg::required_unless_present_any(names)`] and *not* supplying *at least one of* `names`
+    /// or this arg is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required_unless_present_any(["dbg", "infile"])
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .arg(Arg::new("dbg")
+    ///         .long("debug")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("infile")
+    ///         .short('i')
+    ///         .action(ArgAction::Set))
+    ///     .try_get_matches_from(vec![
+    ///         "prog"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    /// [required]: Arg::required()
+    /// [`Arg::required_unless_present_any(names)`]: Arg::required_unless_present_any()
+    /// [`Arg::required_unless_present_all`]: Arg::required_unless_present_all()
+    #[must_use]
+    pub fn required_unless_present_any(
+        mut self,
+        names: impl IntoIterator<Item = impl Into<Id>>,
+    ) -> Self {
+        self.r_unless.extend(names.into_iter().map(Into::into));
+        self
+    }
+
+    /// This argument is [required] only if the specified `arg` is present at runtime and its value
+    /// equals `val`.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .required_if_eq("other_arg", "value")
+    /// # ;
+    /// ```
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .required_if_eq("other", "special")
+    ///         .long("config"))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .action(ArgAction::Set))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--other", "not-special"
+    ///     ]);
+    ///
+    /// assert!(res.is_ok()); // We didn't use --other=special, so "cfg" wasn't required
+    ///
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .required_if_eq("other", "special")
+    ///         .long("config"))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .action(ArgAction::Set))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--other", "special"
+    ///     ]);
+    ///
+    /// // We did use --other=special so "cfg" had become required but was missing.
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    ///
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .required_if_eq("other", "special")
+    ///         .long("config"))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .action(ArgAction::Set))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--other", "SPECIAL"
+    ///     ]);
+    ///
+    /// // By default, the comparison is case-sensitive, so "cfg" wasn't required
+    /// assert!(res.is_ok());
+    ///
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .required_if_eq("other", "special")
+    ///         .long("config"))
+    ///     .arg(Arg::new("other")
+    ///         .long("other")
+    ///         .ignore_case(true)
+    ///         .action(ArgAction::Set))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--other", "SPECIAL"
+    ///     ]);
+    ///
+    /// // However, case-insensitive comparisons can be enabled.  This typically occurs when using Arg::possible_values().
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    /// [`Arg::requires(name)`]: Arg::requires()
+    /// [Conflicting]: Arg::conflicts_with()
+    /// [required]: Arg::required()
+    #[must_use]
+    pub fn required_if_eq(mut self, arg_id: impl Into<Id>, val: impl Into<OsStr>) -> Self {
+        self.r_ifs.push((arg_id.into(), val.into()));
+        self
+    }
+
+    /// Specify this argument is [required] based on multiple conditions.
+    ///
+    /// The conditions are set up in a `(arg, val)` style tuple. The requirement will only become
+    /// valid if one of the specified `arg`'s value equals its corresponding `val`.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .required_if_eq_any([
+    ///         ("extra", "val"),
+    ///         ("option", "spec")
+    ///     ])
+    /// # ;
+    /// ```
+    ///
+    /// Setting `Arg::required_if_eq_any([(arg, val)])` makes this arg required if any of the `arg`s
+    /// are used at runtime and it's corresponding value is equal to `val`. If the `arg`'s value is
+    /// anything other than `val`, this argument isn't required.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required_if_eq_any([
+    ///             ("extra", "val"),
+    ///             ("option", "spec")
+    ///         ])
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .arg(Arg::new("extra")
+    ///         .action(ArgAction::Set)
+    ///         .long("extra"))
+    ///     .arg(Arg::new("option")
+    ///         .action(ArgAction::Set)
+    ///         .long("option"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--option", "other"
+    ///     ]);
+    ///
+    /// assert!(res.is_ok()); // We didn't use --option=spec, or --extra=val so "cfg" isn't required
+    /// ```
+    ///
+    /// Setting `Arg::required_if_eq_any([(arg, val)])` and having any of the `arg`s used with its
+    /// value of `val` but *not* using this arg is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required_if_eq_any([
+    ///             ("extra", "val"),
+    ///             ("option", "spec")
+    ///         ])
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .arg(Arg::new("extra")
+    ///         .action(ArgAction::Set)
+    ///         .long("extra"))
+    ///     .arg(Arg::new("option")
+    ///         .action(ArgAction::Set)
+    ///         .long("option"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--option", "spec"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    /// [`Arg::requires(name)`]: Arg::requires()
+    /// [Conflicting]: Arg::conflicts_with()
+    /// [required]: Arg::required()
+    #[must_use]
+    pub fn required_if_eq_any(
+        mut self,
+        ifs: impl IntoIterator<Item = (impl Into<Id>, impl Into<OsStr>)>,
+    ) -> Self {
+        self.r_ifs
+            .extend(ifs.into_iter().map(|(id, val)| (id.into(), val.into())));
+        self
+    }
+
+    /// Specify this argument is [required] based on multiple conditions.
+    ///
+    /// The conditions are set up in a `(arg, val)` style tuple. The requirement will only become
+    /// valid if every one of the specified `arg`'s value equals its corresponding `val`.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .required_if_eq_all([
+    ///         ("extra", "val"),
+    ///         ("option", "spec")
+    ///     ])
+    /// # ;
+    /// ```
+    ///
+    /// Setting `Arg::required_if_eq_all([(arg, val)])` makes this arg required if all of the `arg`s
+    /// are used at runtime and every value is equal to its corresponding `val`. If the `arg`'s value is
+    /// anything other than `val`, this argument isn't required.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required_if_eq_all([
+    ///             ("extra", "val"),
+    ///             ("option", "spec")
+    ///         ])
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .arg(Arg::new("extra")
+    ///         .action(ArgAction::Set)
+    ///         .long("extra"))
+    ///     .arg(Arg::new("option")
+    ///         .action(ArgAction::Set)
+    ///         .long("option"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--option", "spec"
+    ///     ]);
+    ///
+    /// assert!(res.is_ok()); // We didn't use --option=spec --extra=val so "cfg" isn't required
+    /// ```
+    ///
+    /// Setting `Arg::required_if_eq_all([(arg, val)])` and having all of the `arg`s used with its
+    /// value of `val` but *not* using this arg is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .required_if_eq_all([
+    ///             ("extra", "val"),
+    ///             ("option", "spec")
+    ///         ])
+    ///         .action(ArgAction::Set)
+    ///         .long("config"))
+    ///     .arg(Arg::new("extra")
+    ///         .action(ArgAction::Set)
+    ///         .long("extra"))
+    ///     .arg(Arg::new("option")
+    ///         .action(ArgAction::Set)
+    ///         .long("option"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--extra", "val", "--option", "spec"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    /// [required]: Arg::required()
+    #[must_use]
+    pub fn required_if_eq_all(
+        mut self,
+        ifs: impl IntoIterator<Item = (impl Into<Id>, impl Into<OsStr>)>,
+    ) -> Self {
+        self.r_ifs_all
+            .extend(ifs.into_iter().map(|(id, val)| (id.into(), val.into())));
+        self
+    }
+
+    /// Require another argument if this arg matches the [`ArgPredicate`]
+    ///
+    /// This method takes `value, another_arg` pair. At runtime, clap will check
+    /// if this arg (`self`) matches the [`ArgPredicate`].
+    /// If it does, `another_arg` will be marked as required.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .requires_if("val", "arg")
+    /// # ;
+    /// ```
+    ///
+    /// Setting `Arg::requires_if(val, arg)` requires that the `arg` be used at runtime if the
+    /// defining argument's value is equal to `val`. If the defining argument is anything other than
+    /// `val`, the other argument isn't required.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .requires_if("my.cfg", "other")
+    ///         .long("config"))
+    ///     .arg(Arg::new("other"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--config", "some.cfg"
+    ///     ]);
+    ///
+    /// assert!(res.is_ok()); // We didn't use --config=my.cfg, so other wasn't required
+    /// ```
+    ///
+    /// Setting `Arg::requires_if(val, arg)` and setting the value to `val` but *not* supplying
+    /// `arg` is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .requires_if("my.cfg", "input")
+    ///         .long("config"))
+    ///     .arg(Arg::new("input"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--config", "my.cfg"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    /// [`Arg::requires(name)`]: Arg::requires()
+    /// [Conflicting]: Arg::conflicts_with()
+    /// [override]: Arg::overrides_with()
+    #[must_use]
+    pub fn requires_if(mut self, val: impl Into<ArgPredicate>, arg_id: impl Into<Id>) -> Self {
+        self.requires.push((val.into(), arg_id.into()));
+        self
+    }
+
+    /// Allows multiple conditional requirements.
+    ///
+    /// The requirement will only become valid if this arg's value matches the
+    /// [`ArgPredicate`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .requires_ifs([
+    ///         ("val", "arg"),
+    ///         ("other_val", "arg2"),
+    ///     ])
+    /// # ;
+    /// ```
+    ///
+    /// Setting `Arg::requires_ifs(["val", "arg"])` requires that the `arg` be used at runtime if the
+    /// defining argument's value is equal to `val`. If the defining argument's value is anything other
+    /// than `val`, `arg` isn't required.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .requires_ifs([
+    ///             ("special.conf", "opt"),
+    ///             ("other.conf", "other"),
+    ///         ])
+    ///         .long("config"))
+    ///     .arg(Arg::new("opt")
+    ///         .long("option")
+    ///         .action(ArgAction::Set))
+    ///     .arg(Arg::new("other"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--config", "special.conf"
+    ///     ]);
+    ///
+    /// assert!(res.is_err()); // We  used --config=special.conf so --option <val> is required
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    ///
+    /// Setting `Arg::requires_ifs` with [`ArgPredicate::IsPresent`] and *not* supplying all the
+    /// arguments is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction, builder::ArgPredicate};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .requires_ifs([
+    ///             (ArgPredicate::IsPresent, "input"),
+    ///             (ArgPredicate::IsPresent, "output"),
+    ///         ])
+    ///         .long("config"))
+    ///     .arg(Arg::new("input"))
+    ///     .arg(Arg::new("output"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--config", "file.conf", "in.txt"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// // We didn't use output
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    ///
+    /// [`Arg::requires(name)`]: Arg::requires()
+    /// [Conflicting]: Arg::conflicts_with()
+    /// [override]: Arg::overrides_with()
+    #[must_use]
+    pub fn requires_ifs(
+        mut self,
+        ifs: impl IntoIterator<Item = (impl Into<ArgPredicate>, impl Into<Id>)>,
+    ) -> Self {
+        self.requires
+            .extend(ifs.into_iter().map(|(val, arg)| (val.into(), arg.into())));
+        self
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::requires_ifs`")
+    )]
+    pub fn requires_all(self, ids: impl IntoIterator<Item = impl Into<Id>>) -> Self {
+        self.requires_ifs(ids.into_iter().map(|id| (ArgPredicate::IsPresent, id)))
+    }
+
+    /// This argument is mutually exclusive with the specified argument.
+    ///
+    /// **NOTE:** Conflicting rules take precedence over being required by default. Conflict rules
+    /// only need to be set for one of the two arguments, they do not need to be set for each.
+    ///
+    /// **NOTE:** Defining a conflict is two-way, but does *not* need to defined for both arguments
+    /// (i.e. if A conflicts with B, defining A.conflicts_with(B) is sufficient. You do not
+    /// need to also do B.conflicts_with(A))
+    ///
+    /// **NOTE:** [`Arg::conflicts_with_all(names)`] allows specifying an argument which conflicts with more than one argument.
+    ///
+    /// **NOTE** [`Arg::exclusive(true)`] allows specifying an argument which conflicts with every other argument.
+    ///
+    /// **NOTE:** All arguments implicitly conflict with themselves.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .conflicts_with("debug")
+    /// # ;
+    /// ```
+    ///
+    /// Setting conflicting argument, and having both arguments present at runtime is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .conflicts_with("debug")
+    ///         .long("config"))
+    ///     .arg(Arg::new("debug")
+    ///         .long("debug")
+    ///         .action(ArgAction::SetTrue))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--debug", "--config", "file.conf"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::ArgumentConflict);
+    /// ```
+    ///
+    /// [`Arg::conflicts_with_all(names)`]: Arg::conflicts_with_all()
+    /// [`Arg::exclusive(true)`]: Arg::exclusive()
+    #[must_use]
+    pub fn conflicts_with(mut self, arg_id: impl IntoResettable<Id>) -> Self {
+        if let Some(arg_id) = arg_id.into_resettable().into_option() {
+            self.blacklist.push(arg_id);
+        } else {
+            self.blacklist.clear();
+        }
+        self
+    }
+
+    /// This argument is mutually exclusive with the specified arguments.
+    ///
+    /// See [`Arg::conflicts_with`].
+    ///
+    /// **NOTE:** Conflicting rules take precedence over being required by default. Conflict rules
+    /// only need to be set for one of the two arguments, they do not need to be set for each.
+    ///
+    /// **NOTE:** Defining a conflict is two-way, but does *not* need to defined for both arguments
+    /// (i.e. if A conflicts with B, defining A.conflicts_with(B) is sufficient. You do not need
+    /// need to also do B.conflicts_with(A))
+    ///
+    /// **NOTE:** [`Arg::exclusive(true)`] allows specifying an argument which conflicts with every other argument.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// Arg::new("config")
+    ///     .conflicts_with_all(["debug", "input"])
+    /// # ;
+    /// ```
+    ///
+    /// Setting conflicting argument, and having any of the arguments present at runtime with a
+    /// conflicting argument is an error.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind, ArgAction};
+    /// let res = Command::new("prog")
+    ///     .arg(Arg::new("cfg")
+    ///         .action(ArgAction::Set)
+    ///         .conflicts_with_all(["debug", "input"])
+    ///         .long("config"))
+    ///     .arg(Arg::new("debug")
+    ///         .long("debug"))
+    ///     .arg(Arg::new("input"))
+    ///     .try_get_matches_from(vec![
+    ///         "prog", "--config", "file.conf", "file.txt"
+    ///     ]);
+    ///
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::ArgumentConflict);
+    /// ```
+    /// [`Arg::conflicts_with`]: Arg::conflicts_with()
+    /// [`Arg::exclusive(true)`]: Arg::exclusive()
+    #[must_use]
+    pub fn conflicts_with_all(mut self, names: impl IntoIterator<Item = impl Into<Id>>) -> Self {
+        self.blacklist.extend(names.into_iter().map(Into::into));
+        self
+    }
+
+    /// Sets an overridable argument.
+    ///
+    /// i.e. this argument and the following argument
+    /// will override each other in POSIX style (whichever argument was specified at runtime
+    /// **last** "wins")
+    ///
+    /// **NOTE:** When an argument is overridden it is essentially as if it never was used, any
+    /// conflicts, requirements, etc. are evaluated **after** all "overrides" have been removed
+    ///
+    /// **NOTE:** Overriding an argument implies they [conflict][Arg::conflicts_with`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg};
+    /// let m = Command::new("prog")
+    ///     .arg(arg!(-f --flag "some flag")
+    ///         .conflicts_with("debug"))
+    ///     .arg(arg!(-d --debug "other flag"))
+    ///     .arg(arg!(-c --color "third flag")
+    ///         .overrides_with("flag"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "-f", "-d", "-c"]);
+    ///             //    ^~~~~~~~~~~~^~~~~ flag is overridden by color
+    ///
+    /// assert!(m.get_flag("color"));
+    /// assert!(m.get_flag("debug")); // even though flag conflicts with debug, it's as if flag
+    ///                                 // was never used because it was overridden with color
+    /// assert!(!m.get_flag("flag"));
+    /// ```
+    #[must_use]
+    pub fn overrides_with(mut self, arg_id: impl IntoResettable<Id>) -> Self {
+        if let Some(arg_id) = arg_id.into_resettable().into_option() {
+            self.overrides.push(arg_id);
+        } else {
+            self.overrides.clear();
+        }
+        self
+    }
+
+    /// Sets multiple mutually overridable arguments by name.
+    ///
+    /// i.e. this argument and the following argument will override each other in POSIX style
+    /// (whichever argument was specified at runtime **last** "wins")
+    ///
+    /// **NOTE:** When an argument is overridden it is essentially as if it never was used, any
+    /// conflicts, requirements, etc. are evaluated **after** all "overrides" have been removed
+    ///
+    /// **NOTE:** Overriding an argument implies they [conflict][Arg::conflicts_with_all`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg};
+    /// let m = Command::new("prog")
+    ///     .arg(arg!(-f --flag "some flag")
+    ///         .conflicts_with("color"))
+    ///     .arg(arg!(-d --debug "other flag"))
+    ///     .arg(arg!(-c --color "third flag")
+    ///         .overrides_with_all(["flag", "debug"]))
+    ///     .get_matches_from(vec![
+    ///         "prog", "-f", "-d", "-c"]);
+    ///             //    ^~~~~~^~~~~~~~~ flag and debug are overridden by color
+    ///
+    /// assert!(m.get_flag("color")); // even though flag conflicts with color, it's as if flag
+    ///                                 // and debug were never used because they were overridden
+    ///                                 // with color
+    /// assert!(!m.get_flag("debug"));
+    /// assert!(!m.get_flag("flag"));
+    /// ```
+    #[must_use]
+    pub fn overrides_with_all(mut self, names: impl IntoIterator<Item = impl Into<Id>>) -> Self {
+        self.overrides.extend(names.into_iter().map(Into::into));
+        self
+    }
+}
+
+/// # Reflection
+impl Arg {
+    /// Get the name of the argument
+    #[inline]
+    pub fn get_id(&self) -> &Id {
+        &self.id
+    }
+
+    /// Get the help specified for this argument, if any
+    #[inline]
+    pub fn get_help(&self) -> Option<&StyledStr> {
+        self.help.as_ref()
+    }
+
+    /// Get the long help specified for this argument, if any
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// let arg = Arg::new("foo").long_help("long help");
+    /// assert_eq!(Some("long help".to_owned()), arg.get_long_help().map(|s| s.to_string()));
+    /// ```
+    ///
+    #[inline]
+    pub fn get_long_help(&self) -> Option<&StyledStr> {
+        self.long_help.as_ref()
+    }
+
+    /// Get the help heading specified for this argument, if any
+    #[inline]
+    pub fn get_help_heading(&self) -> Option<&str> {
+        self.help_heading
+            .as_ref()
+            .map(|s| s.as_deref())
+            .unwrap_or_default()
+    }
+
+    /// Get the short option name for this argument, if any
+    #[inline]
+    pub fn get_short(&self) -> Option<char> {
+        self.short
+    }
+
+    /// Get visible short aliases for this argument, if any
+    #[inline]
+    pub fn get_visible_short_aliases(&self) -> Option<Vec<char>> {
+        if self.short_aliases.is_empty() {
+            None
+        } else {
+            Some(
+                self.short_aliases
+                    .iter()
+                    .filter_map(|(c, v)| if *v { Some(c) } else { None })
+                    .copied()
+                    .collect(),
+            )
+        }
+    }
+
+    /// Get *all* short aliases for this argument, if any, both visible and hidden.
+    #[inline]
+    pub fn get_all_short_aliases(&self) -> Option<Vec<char>> {
+        if self.short_aliases.is_empty() {
+            None
+        } else {
+            Some(self.short_aliases.iter().map(|(s, _)| s).copied().collect())
+        }
+    }
+
+    /// Get the short option name and its visible aliases, if any
+    #[inline]
+    pub fn get_short_and_visible_aliases(&self) -> Option<Vec<char>> {
+        let mut shorts = match self.short {
+            Some(short) => vec![short],
+            None => return None,
+        };
+        if let Some(aliases) = self.get_visible_short_aliases() {
+            shorts.extend(aliases);
+        }
+        Some(shorts)
+    }
+
+    /// Get the long option name for this argument, if any
+    #[inline]
+    pub fn get_long(&self) -> Option<&str> {
+        self.long.as_deref()
+    }
+
+    /// Get visible aliases for this argument, if any
+    #[inline]
+    pub fn get_visible_aliases(&self) -> Option<Vec<&str>> {
+        if self.aliases.is_empty() {
+            None
+        } else {
+            Some(
+                self.aliases
+                    .iter()
+                    .filter_map(|(s, v)| if *v { Some(s.as_str()) } else { None })
+                    .collect(),
+            )
+        }
+    }
+
+    /// Get *all* aliases for this argument, if any, both visible and hidden.
+    #[inline]
+    pub fn get_all_aliases(&self) -> Option<Vec<&str>> {
+        if self.aliases.is_empty() {
+            None
+        } else {
+            Some(self.aliases.iter().map(|(s, _)| s.as_str()).collect())
+        }
+    }
+
+    /// Get the long option name and its visible aliases, if any
+    #[inline]
+    pub fn get_long_and_visible_aliases(&self) -> Option<Vec<&str>> {
+        let mut longs = match self.get_long() {
+            Some(long) => vec![long],
+            None => return None,
+        };
+        if let Some(aliases) = self.get_visible_aliases() {
+            longs.extend(aliases);
+        }
+        Some(longs)
+    }
+
+    /// Get the names of possible values for this argument. Only useful for user
+    /// facing applications, such as building help messages or man files
+    pub fn get_possible_values(&self) -> Vec<PossibleValue> {
+        if !self.is_takes_value_set() {
+            vec![]
+        } else {
+            self.get_value_parser()
+                .possible_values()
+                .map(|pvs| pvs.collect())
+                .unwrap_or_default()
+        }
+    }
+
+    /// Get the names of values for this argument.
+    #[inline]
+    pub fn get_value_names(&self) -> Option<&[Str]> {
+        if self.val_names.is_empty() {
+            None
+        } else {
+            Some(&self.val_names)
+        }
+    }
+
+    /// Get the number of values for this argument.
+    #[inline]
+    pub fn get_num_args(&self) -> Option<ValueRange> {
+        self.num_vals
+    }
+
+    #[inline]
+    pub(crate) fn get_min_vals(&self) -> usize {
+        self.get_num_args().expect(INTERNAL_ERROR_MSG).min_values()
+    }
+
+    /// Get the delimiter between multiple values
+    #[inline]
+    pub fn get_value_delimiter(&self) -> Option<char> {
+        self.val_delim
+    }
+
+    /// Get the value terminator for this argument. The value_terminator is a value
+    /// that terminates parsing of multi-valued arguments.
+    #[inline]
+    pub fn get_value_terminator(&self) -> Option<&Str> {
+        self.terminator.as_ref()
+    }
+
+    /// Get the index of this argument, if any
+    #[inline]
+    pub fn get_index(&self) -> Option<usize> {
+        self.index
+    }
+
+    /// Get the value hint of this argument
+    pub fn get_value_hint(&self) -> ValueHint {
+        self.value_hint.unwrap_or_else(|| {
+            if self.is_takes_value_set() {
+                let type_id = self.get_value_parser().type_id();
+                if type_id == AnyValueId::of::<std::path::PathBuf>() {
+                    ValueHint::AnyPath
+                } else {
+                    ValueHint::default()
+                }
+            } else {
+                ValueHint::default()
+            }
+        })
+    }
+
+    /// Get the environment variable name specified for this argument, if any
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use std::ffi::OsStr;
+    /// # use clap::Arg;
+    /// let arg = Arg::new("foo").env("ENVIRONMENT");
+    /// assert_eq!(arg.get_env(), Some(OsStr::new("ENVIRONMENT")));
+    /// ```
+    #[cfg(feature = "env")]
+    pub fn get_env(&self) -> Option<&std::ffi::OsStr> {
+        self.env.as_ref().map(|x| x.0.as_os_str())
+    }
+
+    /// Get the default values specified for this argument, if any
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// let arg = Arg::new("foo").default_value("default value");
+    /// assert_eq!(arg.get_default_values(), &["default value"]);
+    /// ```
+    pub fn get_default_values(&self) -> &[OsStr] {
+        &self.default_vals
+    }
+
+    /// Checks whether this argument is a positional or not.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Arg;
+    /// let arg = Arg::new("foo");
+    /// assert_eq!(arg.is_positional(), true);
+    ///
+    /// let arg = Arg::new("foo").long("foo");
+    /// assert_eq!(arg.is_positional(), false);
+    /// ```
+    pub fn is_positional(&self) -> bool {
+        self.get_long().is_none() && self.get_short().is_none()
+    }
+
+    /// Reports whether [`Arg::required`] is set
+    pub fn is_required_set(&self) -> bool {
+        self.is_set(ArgSettings::Required)
+    }
+
+    pub(crate) fn is_multiple_values_set(&self) -> bool {
+        self.get_num_args().unwrap_or_default().is_multiple()
+    }
+
+    pub(crate) fn is_takes_value_set(&self) -> bool {
+        self.get_action().takes_values()
+    }
+
+    /// Report whether [`Arg::allow_hyphen_values`] is set
+    pub fn is_allow_hyphen_values_set(&self) -> bool {
+        self.is_set(ArgSettings::AllowHyphenValues)
+    }
+
+    /// Report whether [`Arg::allow_negative_numbers`] is set
+    pub fn is_allow_negative_numbers_set(&self) -> bool {
+        self.is_set(ArgSettings::AllowNegativeNumbers)
+    }
+
+    /// Behavior when parsing the argument
+    pub fn get_action(&self) -> &super::ArgAction {
+        const DEFAULT: super::ArgAction = super::ArgAction::Set;
+        self.action.as_ref().unwrap_or(&DEFAULT)
+    }
+
+    /// Configured parser for argument values
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// let cmd = clap::Command::new("raw")
+    ///     .arg(
+    ///         clap::Arg::new("port")
+    ///             .value_parser(clap::value_parser!(usize))
+    ///     );
+    /// let value_parser = cmd.get_arguments()
+    ///     .find(|a| a.get_id() == "port").unwrap()
+    ///     .get_value_parser();
+    /// println!("{value_parser:?}");
+    /// ```
+    pub fn get_value_parser(&self) -> &super::ValueParser {
+        if let Some(value_parser) = self.value_parser.as_ref() {
+            value_parser
+        } else {
+            static DEFAULT: super::ValueParser = super::ValueParser::string();
+            &DEFAULT
+        }
+    }
+
+    /// Report whether [`Arg::global`] is set
+    pub fn is_global_set(&self) -> bool {
+        self.is_set(ArgSettings::Global)
+    }
+
+    /// Report whether [`Arg::next_line_help`] is set
+    pub fn is_next_line_help_set(&self) -> bool {
+        self.is_set(ArgSettings::NextLineHelp)
+    }
+
+    /// Report whether [`Arg::hide`] is set
+    pub fn is_hide_set(&self) -> bool {
+        self.is_set(ArgSettings::Hidden)
+    }
+
+    /// Report whether [`Arg::hide_default_value`] is set
+    pub fn is_hide_default_value_set(&self) -> bool {
+        self.is_set(ArgSettings::HideDefaultValue)
+    }
+
+    /// Report whether [`Arg::hide_possible_values`] is set
+    pub fn is_hide_possible_values_set(&self) -> bool {
+        self.is_set(ArgSettings::HidePossibleValues)
+    }
+
+    /// Report whether [`Arg::hide_env`] is set
+    #[cfg(feature = "env")]
+    pub fn is_hide_env_set(&self) -> bool {
+        self.is_set(ArgSettings::HideEnv)
+    }
+
+    /// Report whether [`Arg::hide_env_values`] is set
+    #[cfg(feature = "env")]
+    pub fn is_hide_env_values_set(&self) -> bool {
+        self.is_set(ArgSettings::HideEnvValues)
+    }
+
+    /// Report whether [`Arg::hide_short_help`] is set
+    pub fn is_hide_short_help_set(&self) -> bool {
+        self.is_set(ArgSettings::HiddenShortHelp)
+    }
+
+    /// Report whether [`Arg::hide_long_help`] is set
+    pub fn is_hide_long_help_set(&self) -> bool {
+        self.is_set(ArgSettings::HiddenLongHelp)
+    }
+
+    /// Report whether [`Arg::require_equals`] is set
+    pub fn is_require_equals_set(&self) -> bool {
+        self.is_set(ArgSettings::RequireEquals)
+    }
+
+    /// Reports whether [`Arg::exclusive`] is set
+    pub fn is_exclusive_set(&self) -> bool {
+        self.is_set(ArgSettings::Exclusive)
+    }
+
+    /// Report whether [`Arg::trailing_var_arg`] is set
+    pub fn is_trailing_var_arg_set(&self) -> bool {
+        self.is_set(ArgSettings::TrailingVarArg)
+    }
+
+    /// Reports whether [`Arg::last`] is set
+    pub fn is_last_set(&self) -> bool {
+        self.is_set(ArgSettings::Last)
+    }
+
+    /// Reports whether [`Arg::ignore_case`] is set
+    pub fn is_ignore_case_set(&self) -> bool {
+        self.is_set(ArgSettings::IgnoreCase)
+    }
+}
+
+/// # Internally used only
+impl Arg {
+    pub(crate) fn _build(&mut self) {
+        if self.action.is_none() {
+            if self.num_vals == Some(ValueRange::EMPTY) {
+                let action = super::ArgAction::SetTrue;
+                self.action = Some(action);
+            } else {
+                let action =
+                    if self.is_positional() && self.num_vals.unwrap_or_default().is_unbounded() {
+                        // Allow collecting arguments interleaved with flags
+                        //
+                        // Bounded values are probably a group and the user should explicitly opt-in to
+                        // Append
+                        super::ArgAction::Append
+                    } else {
+                        super::ArgAction::Set
+                    };
+                self.action = Some(action);
+            }
+        }
+        if let Some(action) = self.action.as_ref() {
+            if let Some(default_value) = action.default_value() {
+                if self.default_vals.is_empty() {
+                    self.default_vals = vec![default_value.into()];
+                }
+            }
+            if let Some(default_value) = action.default_missing_value() {
+                if self.default_missing_vals.is_empty() {
+                    self.default_missing_vals = vec![default_value.into()];
+                }
+            }
+        }
+
+        if self.value_parser.is_none() {
+            if let Some(default) = self.action.as_ref().and_then(|a| a.default_value_parser()) {
+                self.value_parser = Some(default);
+            } else {
+                self.value_parser = Some(super::ValueParser::string());
+            }
+        }
+
+        let val_names_len = self.val_names.len();
+        if val_names_len > 1 {
+            self.num_vals.get_or_insert(val_names_len.into());
+        } else {
+            let nargs = if self.get_action().takes_values() {
+                ValueRange::SINGLE
+            } else {
+                ValueRange::EMPTY
+            };
+            self.num_vals.get_or_insert(nargs);
+        }
+    }
+
+    // Used for positionals when printing
+    pub(crate) fn name_no_brackets(&self) -> String {
+        debug!("Arg::name_no_brackets:{}", self.get_id());
+        let delim = " ";
+        if !self.val_names.is_empty() {
+            debug!("Arg::name_no_brackets: val_names={:#?}", self.val_names);
+
+            if self.val_names.len() > 1 {
+                self.val_names
+                    .iter()
+                    .map(|n| format!("<{n}>"))
+                    .collect::<Vec<_>>()
+                    .join(delim)
+            } else {
+                self.val_names
+                    .first()
+                    .expect(INTERNAL_ERROR_MSG)
+                    .as_str()
+                    .to_owned()
+            }
+        } else {
+            debug!("Arg::name_no_brackets: just name");
+            self.get_id().as_str().to_owned()
+        }
+    }
+
+    pub(crate) fn stylized(&self, styles: &Styles, required: Option<bool>) -> StyledStr {
+        use std::fmt::Write as _;
+        let literal = styles.get_literal();
+
+        let mut styled = StyledStr::new();
+        // Write the name such --long or -l
+        if let Some(l) = self.get_long() {
+            let _ = write!(
+                styled,
+                "{}--{l}{}",
+                literal.render(),
+                literal.render_reset()
+            );
+        } else if let Some(s) = self.get_short() {
+            let _ = write!(styled, "{}-{s}{}", literal.render(), literal.render_reset());
+        }
+        styled.push_styled(&self.stylize_arg_suffix(styles, required));
+        styled
+    }
+
+    pub(crate) fn stylize_arg_suffix(&self, styles: &Styles, required: Option<bool>) -> StyledStr {
+        use std::fmt::Write as _;
+        let literal = styles.get_literal();
+        let placeholder = styles.get_placeholder();
+        let mut styled = StyledStr::new();
+
+        let mut need_closing_bracket = false;
+        if self.is_takes_value_set() && !self.is_positional() {
+            let is_optional_val = self.get_min_vals() == 0;
+            let (style, start) = if self.is_require_equals_set() {
+                if is_optional_val {
+                    need_closing_bracket = true;
+                    (placeholder, "[=")
+                } else {
+                    (literal, "=")
+                }
+            } else if is_optional_val {
+                need_closing_bracket = true;
+                (placeholder, " [")
+            } else {
+                (placeholder, " ")
+            };
+            let _ = write!(styled, "{}{start}{}", style.render(), style.render_reset());
+        }
+        if self.is_takes_value_set() || self.is_positional() {
+            let required = required.unwrap_or_else(|| self.is_required_set());
+            let arg_val = self.render_arg_val(required);
+            let _ = write!(
+                styled,
+                "{}{arg_val}{}",
+                placeholder.render(),
+                placeholder.render_reset()
+            );
+        } else if matches!(*self.get_action(), ArgAction::Count) {
+            let _ = write!(
+                styled,
+                "{}...{}",
+                placeholder.render(),
+                placeholder.render_reset()
+            );
+        }
+        if need_closing_bracket {
+            let _ = write!(
+                styled,
+                "{}]{}",
+                placeholder.render(),
+                placeholder.render_reset()
+            );
+        }
+
+        styled
+    }
+
+    /// Write the values such as `<name1> <name2>`
+    fn render_arg_val(&self, required: bool) -> String {
+        let mut rendered = String::new();
+
+        let num_vals = self.get_num_args().unwrap_or_else(|| 1.into());
+
+        let mut val_names = if self.val_names.is_empty() {
+            vec![self.id.as_internal_str().to_owned()]
+        } else {
+            self.val_names.clone()
+        };
+        if val_names.len() == 1 {
+            let min = num_vals.min_values().max(1);
+            let val_name = val_names.pop().unwrap();
+            val_names = vec![val_name; min];
+        }
+
+        debug_assert!(self.is_takes_value_set());
+        for (n, val_name) in val_names.iter().enumerate() {
+            let arg_name = if self.is_positional() && (num_vals.min_values() == 0 || !required) {
+                format!("[{val_name}]")
+            } else {
+                format!("<{val_name}>")
+            };
+
+            if n != 0 {
+                rendered.push(' ');
+            }
+            rendered.push_str(&arg_name);
+        }
+
+        let mut extra_values = false;
+        extra_values |= val_names.len() < num_vals.max_values();
+        if self.is_positional() && matches!(*self.get_action(), ArgAction::Append) {
+            extra_values = true;
+        }
+        if extra_values {
+            rendered.push_str("...");
+        }
+
+        rendered
+    }
+
+    /// Either multiple values or occurrences
+    pub(crate) fn is_multiple(&self) -> bool {
+        self.is_multiple_values_set() || matches!(*self.get_action(), ArgAction::Append)
+    }
+
+    #[cfg(feature = "help")]
+    pub(crate) fn get_display_order(&self) -> usize {
+        self.disp_ord.unwrap_or(999)
+    }
+}
+
+impl From<&'_ Arg> for Arg {
+    fn from(a: &Arg) -> Self {
+        a.clone()
+    }
+}
+
+impl PartialEq for Arg {
+    fn eq(&self, other: &Arg) -> bool {
+        self.get_id() == other.get_id()
+    }
+}
+
+impl PartialOrd for Arg {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for Arg {
+    fn cmp(&self, other: &Arg) -> Ordering {
+        self.get_id().cmp(other.get_id())
+    }
+}
+
+impl Eq for Arg {}
+
+impl Display for Arg {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        let plain = Styles::plain();
+        self.stylized(&plain, None).fmt(f)
+    }
+}
+
+impl fmt::Debug for Arg {
+    fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
+        let mut ds = f.debug_struct("Arg");
+
+        #[allow(unused_mut)]
+        let mut ds = ds
+            .field("id", &self.id)
+            .field("help", &self.help)
+            .field("long_help", &self.long_help)
+            .field("action", &self.action)
+            .field("value_parser", &self.value_parser)
+            .field("blacklist", &self.blacklist)
+            .field("settings", &self.settings)
+            .field("overrides", &self.overrides)
+            .field("groups", &self.groups)
+            .field("requires", &self.requires)
+            .field("r_ifs", &self.r_ifs)
+            .field("r_unless", &self.r_unless)
+            .field("short", &self.short)
+            .field("long", &self.long)
+            .field("aliases", &self.aliases)
+            .field("short_aliases", &self.short_aliases)
+            .field("disp_ord", &self.disp_ord)
+            .field("val_names", &self.val_names)
+            .field("num_vals", &self.num_vals)
+            .field("val_delim", &self.val_delim)
+            .field("default_vals", &self.default_vals)
+            .field("default_vals_ifs", &self.default_vals_ifs)
+            .field("terminator", &self.terminator)
+            .field("index", &self.index)
+            .field("help_heading", &self.help_heading)
+            .field("value_hint", &self.value_hint)
+            .field("default_missing_vals", &self.default_missing_vals);
+
+        #[cfg(feature = "env")]
+        {
+            ds = ds.field("env", &self.env);
+        }
+
+        ds.finish()
+    }
+}
+
+// Flags
+#[cfg(test)]
+mod test {
+    use super::Arg;
+    use super::ArgAction;
+
+    #[test]
+    fn flag_display_long() {
+        let mut f = Arg::new("flg").long("flag").action(ArgAction::SetTrue);
+        f._build();
+
+        assert_eq!(f.to_string(), "--flag");
+    }
+
+    #[test]
+    fn flag_display_short() {
+        let mut f2 = Arg::new("flg").short('f').action(ArgAction::SetTrue);
+        f2._build();
+
+        assert_eq!(f2.to_string(), "-f");
+    }
+
+    #[test]
+    fn flag_display_count() {
+        let mut f2 = Arg::new("flg").long("flag").action(ArgAction::Count);
+        f2._build();
+
+        assert_eq!(f2.to_string(), "--flag...");
+    }
+
+    #[test]
+    fn flag_display_single_alias() {
+        let mut f = Arg::new("flg")
+            .long("flag")
+            .visible_alias("als")
+            .action(ArgAction::SetTrue);
+        f._build();
+
+        assert_eq!(f.to_string(), "--flag")
+    }
+
+    #[test]
+    fn flag_display_multiple_aliases() {
+        let mut f = Arg::new("flg").short('f').action(ArgAction::SetTrue);
+        f.aliases = vec![
+            ("alias_not_visible".into(), false),
+            ("f2".into(), true),
+            ("f3".into(), true),
+            ("f4".into(), true),
+        ];
+        f._build();
+
+        assert_eq!(f.to_string(), "-f");
+    }
+
+    #[test]
+    fn flag_display_single_short_alias() {
+        let mut f = Arg::new("flg").short('a').action(ArgAction::SetTrue);
+        f.short_aliases = vec![('b', true)];
+        f._build();
+
+        assert_eq!(f.to_string(), "-a")
+    }
+
+    #[test]
+    fn flag_display_multiple_short_aliases() {
+        let mut f = Arg::new("flg").short('a').action(ArgAction::SetTrue);
+        f.short_aliases = vec![('b', false), ('c', true), ('d', true), ('e', true)];
+        f._build();
+
+        assert_eq!(f.to_string(), "-a");
+    }
+
+    // Options
+
+    #[test]
+    fn option_display_multiple_occurrences() {
+        let mut o = Arg::new("opt").long("option").action(ArgAction::Append);
+        o._build();
+
+        assert_eq!(o.to_string(), "--option <opt>");
+    }
+
+    #[test]
+    fn option_display_multiple_values() {
+        let mut o = Arg::new("opt")
+            .long("option")
+            .action(ArgAction::Set)
+            .num_args(1..);
+        o._build();
+
+        assert_eq!(o.to_string(), "--option <opt>...");
+    }
+
+    #[test]
+    fn option_display_zero_or_more_values() {
+        let mut o = Arg::new("opt")
+            .long("option")
+            .action(ArgAction::Set)
+            .num_args(0..);
+        o._build();
+
+        assert_eq!(o.to_string(), "--option [<opt>...]");
+    }
+
+    #[test]
+    fn option_display_one_or_more_values() {
+        let mut o = Arg::new("opt")
+            .long("option")
+            .action(ArgAction::Set)
+            .num_args(1..);
+        o._build();
+
+        assert_eq!(o.to_string(), "--option <opt>...");
+    }
+
+    #[test]
+    fn option_display_zero_or_more_values_with_value_name() {
+        let mut o = Arg::new("opt")
+            .short('o')
+            .action(ArgAction::Set)
+            .num_args(0..)
+            .value_names(["file"]);
+        o._build();
+
+        assert_eq!(o.to_string(), "-o [<file>...]");
+    }
+
+    #[test]
+    fn option_display_one_or_more_values_with_value_name() {
+        let mut o = Arg::new("opt")
+            .short('o')
+            .action(ArgAction::Set)
+            .num_args(1..)
+            .value_names(["file"]);
+        o._build();
+
+        assert_eq!(o.to_string(), "-o <file>...");
+    }
+
+    #[test]
+    fn option_display_optional_value() {
+        let mut o = Arg::new("opt")
+            .long("option")
+            .action(ArgAction::Set)
+            .num_args(0..=1);
+        o._build();
+
+        assert_eq!(o.to_string(), "--option [<opt>]");
+    }
+
+    #[test]
+    fn option_display_value_names() {
+        let mut o = Arg::new("opt")
+            .short('o')
+            .action(ArgAction::Set)
+            .value_names(["file", "name"]);
+        o._build();
+
+        assert_eq!(o.to_string(), "-o <file> <name>");
+    }
+
+    #[test]
+    fn option_display3() {
+        let mut o = Arg::new("opt")
+            .short('o')
+            .num_args(1..)
+            .action(ArgAction::Set)
+            .value_names(["file", "name"]);
+        o._build();
+
+        assert_eq!(o.to_string(), "-o <file> <name>...");
+    }
+
+    #[test]
+    fn option_display_single_alias() {
+        let mut o = Arg::new("opt")
+            .long("option")
+            .action(ArgAction::Set)
+            .visible_alias("als");
+        o._build();
+
+        assert_eq!(o.to_string(), "--option <opt>");
+    }
+
+    #[test]
+    fn option_display_multiple_aliases() {
+        let mut o = Arg::new("opt")
+            .long("option")
+            .action(ArgAction::Set)
+            .visible_aliases(["als2", "als3", "als4"])
+            .alias("als_not_visible");
+        o._build();
+
+        assert_eq!(o.to_string(), "--option <opt>");
+    }
+
+    #[test]
+    fn option_display_single_short_alias() {
+        let mut o = Arg::new("opt")
+            .short('a')
+            .action(ArgAction::Set)
+            .visible_short_alias('b');
+        o._build();
+
+        assert_eq!(o.to_string(), "-a <opt>");
+    }
+
+    #[test]
+    fn option_display_multiple_short_aliases() {
+        let mut o = Arg::new("opt")
+            .short('a')
+            .action(ArgAction::Set)
+            .visible_short_aliases(['b', 'c', 'd'])
+            .short_alias('e');
+        o._build();
+
+        assert_eq!(o.to_string(), "-a <opt>");
+    }
+
+    // Positionals
+
+    #[test]
+    fn positional_display_multiple_values() {
+        let mut p = Arg::new("pos").index(1).num_args(1..);
+        p._build();
+
+        assert_eq!(p.to_string(), "[pos]...");
+    }
+
+    #[test]
+    fn positional_display_multiple_values_required() {
+        let mut p = Arg::new("pos").index(1).num_args(1..).required(true);
+        p._build();
+
+        assert_eq!(p.to_string(), "<pos>...");
+    }
+
+    #[test]
+    fn positional_display_zero_or_more_values() {
+        let mut p = Arg::new("pos").index(1).num_args(0..);
+        p._build();
+
+        assert_eq!(p.to_string(), "[pos]...");
+    }
+
+    #[test]
+    fn positional_display_one_or_more_values() {
+        let mut p = Arg::new("pos").index(1).num_args(1..);
+        p._build();
+
+        assert_eq!(p.to_string(), "[pos]...");
+    }
+
+    #[test]
+    fn positional_display_one_or_more_values_required() {
+        let mut p = Arg::new("pos").index(1).num_args(1..).required(true);
+        p._build();
+
+        assert_eq!(p.to_string(), "<pos>...");
+    }
+
+    #[test]
+    fn positional_display_optional_value() {
+        let mut p = Arg::new("pos")
+            .index(1)
+            .num_args(0..=1)
+            .action(ArgAction::Set);
+        p._build();
+
+        assert_eq!(p.to_string(), "[pos]");
+    }
+
+    #[test]
+    fn positional_display_multiple_occurrences() {
+        let mut p = Arg::new("pos").index(1).action(ArgAction::Append);
+        p._build();
+
+        assert_eq!(p.to_string(), "[pos]...");
+    }
+
+    #[test]
+    fn positional_display_multiple_occurrences_required() {
+        let mut p = Arg::new("pos")
+            .index(1)
+            .action(ArgAction::Append)
+            .required(true);
+        p._build();
+
+        assert_eq!(p.to_string(), "<pos>...");
+    }
+
+    #[test]
+    fn positional_display_required() {
+        let mut p = Arg::new("pos").index(1).required(true);
+        p._build();
+
+        assert_eq!(p.to_string(), "<pos>");
+    }
+
+    #[test]
+    fn positional_display_val_names() {
+        let mut p = Arg::new("pos").index(1).value_names(["file1", "file2"]);
+        p._build();
+
+        assert_eq!(p.to_string(), "[file1] [file2]");
+    }
+
+    #[test]
+    fn positional_display_val_names_required() {
+        let mut p = Arg::new("pos")
+            .index(1)
+            .value_names(["file1", "file2"])
+            .required(true);
+        p._build();
+
+        assert_eq!(p.to_string(), "<file1> <file2>");
+    }
+}
diff --git a/vendor/clap_builder/src/builder/arg_group.rs b/vendor/clap_builder/src/builder/arg_group.rs
new file mode 100644
index 0000000..d3a37c1
--- /dev/null
+++ b/vendor/clap_builder/src/builder/arg_group.rs
@@ -0,0 +1,611 @@
+// Internal
+use crate::builder::IntoResettable;
+use crate::util::Id;
+
+/// Family of related [arguments].
+///
+/// By placing arguments in a logical group, you can create easier requirement and
+/// exclusion rules instead of having to list each argument individually, or when you want a rule
+/// to apply "any but not all" arguments.
+///
+/// For instance, you can make an entire `ArgGroup` required. If [`ArgGroup::multiple(true)`] is
+/// set, this means that at least one argument from that group must be present. If
+/// [`ArgGroup::multiple(false)`] is set (the default), one and *only* one must be present.
+///
+/// You can also do things such as name an entire `ArgGroup` as a [conflict] or [requirement] for
+/// another argument, meaning any of the arguments that belong to that group will cause a failure
+/// if present, or must be present respectively.
+///
+/// Perhaps the most common use of `ArgGroup`s is to require one and *only* one argument to be
+/// present out of a given set. Imagine that you had multiple arguments, and you want one of them
+/// to be required, but making all of them required isn't feasible because perhaps they conflict
+/// with each other. For example, lets say that you were building an application where one could
+/// set a given version number by supplying a string with an option argument, i.e.
+/// `--set-ver v1.2.3`, you also wanted to support automatically using a previous version number
+/// and simply incrementing one of the three numbers. So you create three flags `--major`,
+/// `--minor`, and `--patch`. All of these arguments shouldn't be used at one time but you want to
+/// specify that *at least one* of them is used. For this, you can create a group.
+///
+/// Finally, you may use `ArgGroup`s to pull a value from a group of arguments when you don't care
+/// exactly which argument was actually used at runtime.
+///
+/// # Examples
+///
+/// The following example demonstrates using an `ArgGroup` to ensure that one, and only one, of
+/// the arguments from the specified group is present at runtime.
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// # use clap::{Command, arg, ArgGroup, error::ErrorKind};
+/// let result = Command::new("cmd")
+///     .arg(arg!(--"set-ver" <ver> "set the version manually"))
+///     .arg(arg!(--major           "auto increase major"))
+///     .arg(arg!(--minor           "auto increase minor"))
+///     .arg(arg!(--patch           "auto increase patch"))
+///     .group(ArgGroup::new("vers")
+///          .args(["set-ver", "major", "minor", "patch"])
+///          .required(true))
+///     .try_get_matches_from(vec!["cmd", "--major", "--patch"]);
+/// // Because we used two args in the group it's an error
+/// assert!(result.is_err());
+/// let err = result.unwrap_err();
+/// assert_eq!(err.kind(), ErrorKind::ArgumentConflict);
+/// ```
+///
+/// This next example shows a passing parse of the same scenario
+/// ```rust
+/// # use clap_builder as clap;
+/// # use clap::{Command, arg, ArgGroup, Id};
+/// let result = Command::new("cmd")
+///     .arg(arg!(--"set-ver" <ver> "set the version manually"))
+///     .arg(arg!(--major           "auto increase major"))
+///     .arg(arg!(--minor           "auto increase minor"))
+///     .arg(arg!(--patch           "auto increase patch"))
+///     .group(ArgGroup::new("vers")
+///          .args(["set-ver", "major", "minor","patch"])
+///          .required(true))
+///     .try_get_matches_from(vec!["cmd", "--major"]);
+/// assert!(result.is_ok());
+/// let matches = result.unwrap();
+/// // We may not know which of the args was used, so we can test for the group...
+/// assert!(matches.contains_id("vers"));
+/// // We can also ask the group which arg was used
+/// assert_eq!(matches
+///     .get_one::<Id>("vers")
+///     .expect("`vers` is required")
+///     .as_str(),
+///     "major"
+/// );
+/// // we could also alternatively check each arg individually (not shown here)
+/// ```
+/// [`ArgGroup::multiple(true)`]: ArgGroup::multiple()
+///
+/// [`ArgGroup::multiple(false)`]: ArgGroup::multiple()
+/// [arguments]: crate::Arg
+/// [conflict]: crate::Arg::conflicts_with()
+/// [requirement]: crate::Arg::requires()
+#[derive(Default, Clone, Debug, PartialEq, Eq)]
+pub struct ArgGroup {
+    pub(crate) id: Id,
+    pub(crate) args: Vec<Id>,
+    pub(crate) required: bool,
+    pub(crate) requires: Vec<Id>,
+    pub(crate) conflicts: Vec<Id>,
+    pub(crate) multiple: bool,
+}
+
+/// # Builder
+impl ArgGroup {
+    /// Create a `ArgGroup` using a unique name.
+    ///
+    /// The name will be used to get values from the group or refer to the group inside of conflict
+    /// and requirement rules.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, ArgGroup};
+    /// ArgGroup::new("config")
+    /// # ;
+    /// ```
+    pub fn new(id: impl Into<Id>) -> Self {
+        ArgGroup::default().id(id)
+    }
+
+    /// Sets the group name.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, ArgGroup};
+    /// ArgGroup::default().id("config")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn id(mut self, id: impl Into<Id>) -> Self {
+        self.id = id.into();
+        self
+    }
+
+    /// Adds an [argument] to this group by name
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgGroup, ArgAction};
+    /// let m = Command::new("myprog")
+    ///     .arg(Arg::new("flag")
+    ///         .short('f')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("color")
+    ///         .short('c')
+    ///         .action(ArgAction::SetTrue))
+    ///     .group(ArgGroup::new("req_flags")
+    ///         .arg("flag")
+    ///         .arg("color"))
+    ///     .get_matches_from(vec!["myprog", "-f"]);
+    /// // maybe we don't know which of the two flags was used...
+    /// assert!(m.contains_id("req_flags"));
+    /// // but we can also check individually if needed
+    /// assert!(m.contains_id("flag"));
+    /// ```
+    /// [argument]: crate::Arg
+    #[must_use]
+    pub fn arg(mut self, arg_id: impl IntoResettable<Id>) -> Self {
+        if let Some(arg_id) = arg_id.into_resettable().into_option() {
+            self.args.push(arg_id);
+        } else {
+            self.args.clear();
+        }
+        self
+    }
+
+    /// Adds multiple [arguments] to this group by name
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgGroup, ArgAction};
+    /// let m = Command::new("myprog")
+    ///     .arg(Arg::new("flag")
+    ///         .short('f')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("color")
+    ///         .short('c')
+    ///         .action(ArgAction::SetTrue))
+    ///     .group(ArgGroup::new("req_flags")
+    ///         .args(["flag", "color"]))
+    ///     .get_matches_from(vec!["myprog", "-f"]);
+    /// // maybe we don't know which of the two flags was used...
+    /// assert!(m.contains_id("req_flags"));
+    /// // but we can also check individually if needed
+    /// assert!(m.contains_id("flag"));
+    /// ```
+    /// [arguments]: crate::Arg
+    #[must_use]
+    pub fn args(mut self, ns: impl IntoIterator<Item = impl Into<Id>>) -> Self {
+        for n in ns {
+            self = self.arg(n);
+        }
+        self
+    }
+
+    /// Getters for all args. It will return a vector of `Id`
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{ArgGroup};
+    /// let args: Vec<&str> = vec!["a1".into(), "a4".into()];
+    /// let grp = ArgGroup::new("program").args(&args);
+    ///
+    /// for (pos, arg) in grp.get_args().enumerate() {
+    ///     assert_eq!(*arg, args[pos]);
+    /// }
+    /// ```
+    pub fn get_args(&self) -> impl Iterator<Item = &Id> {
+        self.args.iter()
+    }
+
+    /// Allows more than one of the [`Arg`]s in this group to be used. (Default: `false`)
+    ///
+    /// # Examples
+    ///
+    /// Notice in this example we use *both* the `-f` and `-c` flags which are both part of the
+    /// group
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgGroup, ArgAction};
+    /// let m = Command::new("myprog")
+    ///     .arg(Arg::new("flag")
+    ///         .short('f')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("color")
+    ///         .short('c')
+    ///         .action(ArgAction::SetTrue))
+    ///     .group(ArgGroup::new("req_flags")
+    ///         .args(["flag", "color"])
+    ///         .multiple(true))
+    ///     .get_matches_from(vec!["myprog", "-f", "-c"]);
+    /// // maybe we don't know which of the two flags was used...
+    /// assert!(m.contains_id("req_flags"));
+    /// ```
+    /// In this next example, we show the default behavior (i.e. `multiple(false)) which will throw
+    /// an error if more than one of the args in the group was used.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgGroup, error::ErrorKind, ArgAction};
+    /// let result = Command::new("myprog")
+    ///     .arg(Arg::new("flag")
+    ///         .short('f')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("color")
+    ///         .short('c')
+    ///         .action(ArgAction::SetTrue))
+    ///     .group(ArgGroup::new("req_flags")
+    ///         .args(["flag", "color"]))
+    ///     .try_get_matches_from(vec!["myprog", "-f", "-c"]);
+    /// // Because we used both args in the group it's an error
+    /// assert!(result.is_err());
+    /// let err = result.unwrap_err();
+    /// assert_eq!(err.kind(), ErrorKind::ArgumentConflict);
+    /// ```
+    ///
+    /// [`Arg`]: crate::Arg
+    #[inline]
+    #[must_use]
+    pub fn multiple(mut self, yes: bool) -> Self {
+        self.multiple = yes;
+        self
+    }
+
+    /// Return true if the group allows more than one of the arguments
+    /// in this group to be used. (Default: `false`)
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{ArgGroup};
+    /// let mut group = ArgGroup::new("myprog")
+    ///     .args(["f", "c"])
+    ///     .multiple(true);
+    ///
+    /// assert!(group.is_multiple());
+    /// ```
+    pub fn is_multiple(&mut self) -> bool {
+        self.multiple
+    }
+
+    /// Require an argument from the group to be present when parsing.
+    ///
+    /// This is unless conflicting with another argument.  A required group will be displayed in
+    /// the usage string of the application in the format `<arg|arg2|arg3>`.
+    ///
+    /// **NOTE:** This setting only applies to the current [`Command`] / [`Subcommand`]s, and not
+    /// globally.
+    ///
+    /// **NOTE:** By default, [`ArgGroup::multiple`] is set to `false` which when combined with
+    /// `ArgGroup::required(true)` states, "One and *only one* arg must be used from this group.
+    /// Use of more than one arg is an error." Vice setting `ArgGroup::multiple(true)` which
+    /// states, '*At least* one arg from this group must be used. Using multiple is OK."
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgGroup, error::ErrorKind, ArgAction};
+    /// let result = Command::new("myprog")
+    ///     .arg(Arg::new("flag")
+    ///         .short('f')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("color")
+    ///         .short('c')
+    ///         .action(ArgAction::SetTrue))
+    ///     .group(ArgGroup::new("req_flags")
+    ///         .args(["flag", "color"])
+    ///         .required(true))
+    ///     .try_get_matches_from(vec!["myprog"]);
+    /// // Because we didn't use any of the args in the group, it's an error
+    /// assert!(result.is_err());
+    /// let err = result.unwrap_err();
+    /// assert_eq!(err.kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    ///
+    /// [`Subcommand`]: crate::Subcommand
+    /// [`ArgGroup::multiple`]: ArgGroup::multiple()
+    /// [`Command`]: crate::Command
+    #[inline]
+    #[must_use]
+    pub fn required(mut self, yes: bool) -> Self {
+        self.required = yes;
+        self
+    }
+
+    /// Specify an argument or group that must be present when this group is.
+    ///
+    /// This is not to be confused with a [required group]. Requirement rules function just like
+    /// [argument requirement rules], you can name other arguments or groups that must be present
+    /// when any one of the arguments from this group is used.
+    ///
+    /// **NOTE:** The name provided may be an argument or group name
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgGroup, error::ErrorKind, ArgAction};
+    /// let result = Command::new("myprog")
+    ///     .arg(Arg::new("flag")
+    ///         .short('f')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("color")
+    ///         .short('c')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("debug")
+    ///         .short('d')
+    ///         .action(ArgAction::SetTrue))
+    ///     .group(ArgGroup::new("req_flags")
+    ///         .args(["flag", "color"])
+    ///         .requires("debug"))
+    ///     .try_get_matches_from(vec!["myprog", "-c"]);
+    /// // because we used an arg from the group, and the group requires "-d" to be used, it's an
+    /// // error
+    /// assert!(result.is_err());
+    /// let err = result.unwrap_err();
+    /// assert_eq!(err.kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    /// [required group]: ArgGroup::required()
+    /// [argument requirement rules]: crate::Arg::requires()
+    #[must_use]
+    pub fn requires(mut self, id: impl IntoResettable<Id>) -> Self {
+        if let Some(id) = id.into_resettable().into_option() {
+            self.requires.push(id);
+        } else {
+            self.requires.clear();
+        }
+        self
+    }
+
+    /// Specify arguments or groups that must be present when this group is.
+    ///
+    /// This is not to be confused with a [required group]. Requirement rules function just like
+    /// [argument requirement rules], you can name other arguments or groups that must be present
+    /// when one of the arguments from this group is used.
+    ///
+    /// **NOTE:** The names provided may be an argument or group name
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgGroup, error::ErrorKind, ArgAction};
+    /// let result = Command::new("myprog")
+    ///     .arg(Arg::new("flag")
+    ///         .short('f')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("color")
+    ///         .short('c')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("debug")
+    ///         .short('d')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("verb")
+    ///         .short('v')
+    ///         .action(ArgAction::SetTrue))
+    ///     .group(ArgGroup::new("req_flags")
+    ///         .args(["flag", "color"])
+    ///         .requires_all(["debug", "verb"]))
+    ///     .try_get_matches_from(vec!["myprog", "-c", "-d"]);
+    /// // because we used an arg from the group, and the group requires "-d" and "-v" to be used,
+    /// // yet we only used "-d" it's an error
+    /// assert!(result.is_err());
+    /// let err = result.unwrap_err();
+    /// assert_eq!(err.kind(), ErrorKind::MissingRequiredArgument);
+    /// ```
+    /// [required group]: ArgGroup::required()
+    /// [argument requirement rules]: crate::Arg::requires_ifs()
+    #[must_use]
+    pub fn requires_all(mut self, ns: impl IntoIterator<Item = impl Into<Id>>) -> Self {
+        for n in ns {
+            self = self.requires(n);
+        }
+        self
+    }
+
+    /// Specify an argument or group that must **not** be present when this group is.
+    ///
+    /// Exclusion (aka conflict) rules function just like [argument exclusion rules], you can name
+    /// other arguments or groups that must *not* be present when one of the arguments from this
+    /// group are used.
+    ///
+    /// **NOTE:** The name provided may be an argument, or group name
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgGroup, error::ErrorKind, ArgAction};
+    /// let result = Command::new("myprog")
+    ///     .arg(Arg::new("flag")
+    ///         .short('f')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("color")
+    ///         .short('c')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("debug")
+    ///         .short('d')
+    ///         .action(ArgAction::SetTrue))
+    ///     .group(ArgGroup::new("req_flags")
+    ///         .args(["flag", "color"])
+    ///         .conflicts_with("debug"))
+    ///     .try_get_matches_from(vec!["myprog", "-c", "-d"]);
+    /// // because we used an arg from the group, and the group conflicts with "-d", it's an error
+    /// assert!(result.is_err());
+    /// let err = result.unwrap_err();
+    /// assert_eq!(err.kind(), ErrorKind::ArgumentConflict);
+    /// ```
+    /// [argument exclusion rules]: crate::Arg::conflicts_with()
+    #[must_use]
+    pub fn conflicts_with(mut self, id: impl IntoResettable<Id>) -> Self {
+        if let Some(id) = id.into_resettable().into_option() {
+            self.conflicts.push(id);
+        } else {
+            self.conflicts.clear();
+        }
+        self
+    }
+
+    /// Specify arguments or groups that must **not** be present when this group is.
+    ///
+    /// Exclusion rules function just like [argument exclusion rules], you can name other arguments
+    /// or groups that must *not* be present when one of the arguments from this group are used.
+    ///
+    /// **NOTE:** The names provided may be an argument, or group name
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgGroup, error::ErrorKind, ArgAction};
+    /// let result = Command::new("myprog")
+    ///     .arg(Arg::new("flag")
+    ///         .short('f')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("color")
+    ///         .short('c')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("debug")
+    ///         .short('d')
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("verb")
+    ///         .short('v')
+    ///         .action(ArgAction::SetTrue))
+    ///     .group(ArgGroup::new("req_flags")
+    ///         .args(["flag", "color"])
+    ///         .conflicts_with_all(["debug", "verb"]))
+    ///     .try_get_matches_from(vec!["myprog", "-c", "-v"]);
+    /// // because we used an arg from the group, and the group conflicts with either "-v" or "-d"
+    /// // it's an error
+    /// assert!(result.is_err());
+    /// let err = result.unwrap_err();
+    /// assert_eq!(err.kind(), ErrorKind::ArgumentConflict);
+    /// ```
+    ///
+    /// [argument exclusion rules]: crate::Arg::conflicts_with_all()
+    #[must_use]
+    pub fn conflicts_with_all(mut self, ns: impl IntoIterator<Item = impl Into<Id>>) -> Self {
+        for n in ns {
+            self = self.conflicts_with(n);
+        }
+        self
+    }
+}
+
+/// # Reflection
+impl ArgGroup {
+    /// Get the name of the group
+    #[inline]
+    pub fn get_id(&self) -> &Id {
+        &self.id
+    }
+
+    /// Reports whether [`ArgGroup::required`] is set
+    #[inline]
+    pub fn is_required_set(&self) -> bool {
+        self.required
+    }
+}
+
+impl From<&'_ ArgGroup> for ArgGroup {
+    fn from(g: &ArgGroup) -> Self {
+        g.clone()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn groups() {
+        let g = ArgGroup::new("test")
+            .arg("a1")
+            .arg("a4")
+            .args(["a2", "a3"])
+            .required(true)
+            .conflicts_with("c1")
+            .conflicts_with_all(["c2", "c3"])
+            .conflicts_with("c4")
+            .requires("r1")
+            .requires_all(["r2", "r3"])
+            .requires("r4");
+
+        let args: Vec<Id> = vec!["a1".into(), "a4".into(), "a2".into(), "a3".into()];
+        let reqs: Vec<Id> = vec!["r1".into(), "r2".into(), "r3".into(), "r4".into()];
+        let confs: Vec<Id> = vec!["c1".into(), "c2".into(), "c3".into(), "c4".into()];
+
+        assert_eq!(g.args, args);
+        assert_eq!(g.requires, reqs);
+        assert_eq!(g.conflicts, confs);
+    }
+
+    #[test]
+    fn test_from() {
+        let g = ArgGroup::new("test")
+            .arg("a1")
+            .arg("a4")
+            .args(["a2", "a3"])
+            .required(true)
+            .conflicts_with("c1")
+            .conflicts_with_all(["c2", "c3"])
+            .conflicts_with("c4")
+            .requires("r1")
+            .requires_all(["r2", "r3"])
+            .requires("r4");
+
+        let args: Vec<Id> = vec!["a1".into(), "a4".into(), "a2".into(), "a3".into()];
+        let reqs: Vec<Id> = vec!["r1".into(), "r2".into(), "r3".into(), "r4".into()];
+        let confs: Vec<Id> = vec!["c1".into(), "c2".into(), "c3".into(), "c4".into()];
+
+        let g2 = ArgGroup::from(&g);
+        assert_eq!(g2.args, args);
+        assert_eq!(g2.requires, reqs);
+        assert_eq!(g2.conflicts, confs);
+    }
+
+    // This test will *fail to compile* if ArgGroup is not Send + Sync
+    #[test]
+    fn arg_group_send_sync() {
+        fn foo<T: Send + Sync>(_: T) {}
+        foo(ArgGroup::new("test"))
+    }
+
+    #[test]
+    fn arg_group_expose_is_multiple_helper() {
+        let args: Vec<Id> = vec!["a1".into(), "a4".into()];
+
+        let mut grp_multiple = ArgGroup::new("test_multiple").args(&args).multiple(true);
+        assert!(grp_multiple.is_multiple());
+
+        let mut grp_not_multiple = ArgGroup::new("test_multiple").args(&args).multiple(false);
+        assert!(!grp_not_multiple.is_multiple());
+    }
+
+    #[test]
+    fn arg_group_expose_get_args_helper() {
+        let args: Vec<Id> = vec!["a1".into(), "a4".into()];
+        let grp = ArgGroup::new("program").args(&args);
+
+        for (pos, arg) in grp.get_args().enumerate() {
+            assert_eq!(*arg, args[pos]);
+        }
+    }
+}
diff --git a/vendor/clap_builder/src/builder/arg_predicate.rs b/vendor/clap_builder/src/builder/arg_predicate.rs
new file mode 100644
index 0000000..bc79a11
--- /dev/null
+++ b/vendor/clap_builder/src/builder/arg_predicate.rs
@@ -0,0 +1,19 @@
+use crate::builder::OsStr;
+
+/// Operations to perform on argument values
+///
+/// These do not apply to [`ValueSource::DefaultValue`][crate::parser::ValueSource::DefaultValue]
+#[derive(Clone, Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "unstable-v5", non_exhaustive)]
+pub enum ArgPredicate {
+    /// Is the argument present?
+    IsPresent,
+    /// Does the argument match the specified value?
+    Equals(OsStr),
+}
+
+impl<S: Into<OsStr>> From<S> for ArgPredicate {
+    fn from(other: S) -> Self {
+        Self::Equals(other.into())
+    }
+}
diff --git a/vendor/clap_builder/src/builder/arg_settings.rs b/vendor/clap_builder/src/builder/arg_settings.rs
new file mode 100644
index 0000000..fd47504
--- /dev/null
+++ b/vendor/clap_builder/src/builder/arg_settings.rs
@@ -0,0 +1,91 @@
+#[allow(unused)]
+use crate::Arg;
+
+#[derive(Default, Copy, Clone, Debug, PartialEq, Eq)]
+pub(crate) struct ArgFlags(u32);
+
+impl ArgFlags {
+    pub(crate) fn set(&mut self, setting: ArgSettings) {
+        self.0 |= setting.bit();
+    }
+
+    pub(crate) fn unset(&mut self, setting: ArgSettings) {
+        self.0 &= !setting.bit();
+    }
+
+    pub(crate) fn is_set(&self, setting: ArgSettings) -> bool {
+        self.0 & setting.bit() != 0
+    }
+
+    pub(crate) fn insert(&mut self, other: Self) {
+        self.0 |= other.0;
+    }
+}
+
+impl std::ops::BitOr for ArgFlags {
+    type Output = Self;
+
+    fn bitor(mut self, rhs: Self) -> Self::Output {
+        self.insert(rhs);
+        self
+    }
+}
+
+/// Various settings that apply to arguments and may be set, unset, and checked via getter/setter
+/// methods [`Arg::setting`], [`Arg::unset_setting`], and [`Arg::is_set`]. This is what the
+/// [`Arg`] methods which accept a `bool` use internally.
+///
+/// [`Arg`]: crate::Arg
+/// [`Arg::setting`]: crate::Arg::setting()
+/// [`Arg::unset_setting`]: crate::Arg::unset_setting()
+/// [`Arg::is_set`]: crate::Arg::is_set()
+#[derive(Debug, PartialEq, Copy, Clone)]
+#[repr(u8)]
+pub(crate) enum ArgSettings {
+    Required,
+    Global,
+    Hidden,
+    NextLineHelp,
+    HidePossibleValues,
+    AllowHyphenValues,
+    AllowNegativeNumbers,
+    RequireEquals,
+    Last,
+    TrailingVarArg,
+    HideDefaultValue,
+    IgnoreCase,
+    #[cfg(feature = "env")]
+    HideEnv,
+    #[cfg(feature = "env")]
+    HideEnvValues,
+    HiddenShortHelp,
+    HiddenLongHelp,
+    Exclusive,
+}
+
+impl ArgSettings {
+    fn bit(self) -> u32 {
+        1 << (self as u8)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::Arg;
+
+    #[test]
+    fn setting() {
+        let m = Arg::new("setting").setting(ArgSettings::Required);
+        assert!(m.is_required_set());
+    }
+
+    #[test]
+    fn unset_setting() {
+        let m = Arg::new("unset_setting").setting(ArgSettings::Required);
+        assert!(m.is_required_set());
+
+        let m = m.unset_setting(ArgSettings::Required);
+        assert!(!m.is_required_set(), "{m:#?}");
+    }
+}
diff --git a/vendor/clap_builder/src/builder/command.rs b/vendor/clap_builder/src/builder/command.rs
new file mode 100644
index 0000000..6e56b18
--- /dev/null
+++ b/vendor/clap_builder/src/builder/command.rs
@@ -0,0 +1,4916 @@
+#![cfg_attr(not(feature = "usage"), allow(unused_mut))]
+
+// Std
+use std::env;
+use std::ffi::OsString;
+use std::fmt;
+use std::io;
+use std::ops::Index;
+use std::path::Path;
+
+// Internal
+use crate::builder::app_settings::{AppFlags, AppSettings};
+use crate::builder::arg_settings::ArgSettings;
+use crate::builder::ext::Extensions;
+use crate::builder::ArgAction;
+use crate::builder::IntoResettable;
+use crate::builder::PossibleValue;
+use crate::builder::Str;
+use crate::builder::StyledStr;
+use crate::builder::Styles;
+use crate::builder::{Arg, ArgGroup, ArgPredicate};
+use crate::error::ErrorKind;
+use crate::error::Result as ClapResult;
+use crate::mkeymap::MKeyMap;
+use crate::output::fmt::Stream;
+use crate::output::{fmt::Colorizer, write_help, Usage};
+use crate::parser::{ArgMatcher, ArgMatches, Parser};
+use crate::util::ChildGraph;
+use crate::util::{color::ColorChoice, Id};
+use crate::{Error, INTERNAL_ERROR_MSG};
+
+#[cfg(debug_assertions)]
+use crate::builder::debug_asserts::assert_app;
+
+/// Build a command-line interface.
+///
+/// This includes defining arguments, subcommands, parser behavior, and help output.
+/// Once all configuration is complete,
+/// the [`Command::get_matches`] family of methods starts the runtime-parsing
+/// process. These methods then return information about the user supplied
+/// arguments (or lack thereof).
+///
+/// When deriving a [`Parser`][crate::Parser], you can use
+/// [`CommandFactory::command`][crate::CommandFactory::command] to access the
+/// `Command`.
+///
+/// - [Basic API][crate::Command#basic-api]
+/// - [Application-wide Settings][crate::Command#application-wide-settings]
+/// - [Command-specific Settings][crate::Command#command-specific-settings]
+/// - [Subcommand-specific Settings][crate::Command#subcommand-specific-settings]
+/// - [Reflection][crate::Command#reflection]
+///
+/// # Examples
+///
+/// ```no_run
+/// # use clap_builder as clap;
+/// # use clap::{Command, Arg};
+/// let m = Command::new("My Program")
+///     .author("Me, me@mail.com")
+///     .version("1.0.2")
+///     .about("Explains in brief what the program does")
+///     .arg(
+///         Arg::new("in_file")
+///     )
+///     .after_help("Longer explanation to appear after the options when \
+///                  displaying the help information from --help or -h")
+///     .get_matches();
+///
+/// // Your program logic starts here...
+/// ```
+/// [`Command::get_matches`]: Command::get_matches()
+#[derive(Debug, Clone)]
+pub struct Command {
+    name: Str,
+    long_flag: Option<Str>,
+    short_flag: Option<char>,
+    display_name: Option<String>,
+    bin_name: Option<String>,
+    author: Option<Str>,
+    version: Option<Str>,
+    long_version: Option<Str>,
+    about: Option<StyledStr>,
+    long_about: Option<StyledStr>,
+    before_help: Option<StyledStr>,
+    before_long_help: Option<StyledStr>,
+    after_help: Option<StyledStr>,
+    after_long_help: Option<StyledStr>,
+    aliases: Vec<(Str, bool)>,             // (name, visible)
+    short_flag_aliases: Vec<(char, bool)>, // (name, visible)
+    long_flag_aliases: Vec<(Str, bool)>,   // (name, visible)
+    usage_str: Option<StyledStr>,
+    usage_name: Option<String>,
+    help_str: Option<StyledStr>,
+    disp_ord: Option<usize>,
+    #[cfg(feature = "help")]
+    template: Option<StyledStr>,
+    settings: AppFlags,
+    g_settings: AppFlags,
+    args: MKeyMap,
+    subcommands: Vec<Command>,
+    groups: Vec<ArgGroup>,
+    current_help_heading: Option<Str>,
+    current_disp_ord: Option<usize>,
+    subcommand_value_name: Option<Str>,
+    subcommand_heading: Option<Str>,
+    external_value_parser: Option<super::ValueParser>,
+    long_help_exists: bool,
+    deferred: Option<fn(Command) -> Command>,
+    app_ext: Extensions,
+}
+
+/// # Basic API
+impl Command {
+    /// Creates a new instance of an `Command`.
+    ///
+    /// It is common, but not required, to use binary name as the `name`. This
+    /// name will only be displayed to the user when they request to print
+    /// version or help and usage information.
+    ///
+    /// See also [`command!`](crate::command!) and [`crate_name!`](crate::crate_name!).
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("My Program")
+    /// # ;
+    /// ```
+    pub fn new(name: impl Into<Str>) -> Self {
+        /// The actual implementation of `new`, non-generic to save code size.
+        ///
+        /// If we don't do this rustc will unnecessarily generate multiple versions
+        /// of this code.
+        fn new_inner(name: Str) -> Command {
+            Command {
+                name,
+                ..Default::default()
+            }
+        }
+
+        new_inner(name.into())
+    }
+
+    /// Adds an [argument] to the list of valid possibilities.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg, Arg};
+    /// Command::new("myprog")
+    ///     // Adding a single "flag" argument with a short and help text, using Arg::new()
+    ///     .arg(
+    ///         Arg::new("debug")
+    ///            .short('d')
+    ///            .help("turns on debugging mode")
+    ///     )
+    ///     // Adding a single "option" argument with a short, a long, and help text using the less
+    ///     // verbose Arg::from()
+    ///     .arg(
+    ///         arg!(-c --config <CONFIG> "Optionally sets a config file to use")
+    ///     )
+    /// # ;
+    /// ```
+    /// [argument]: Arg
+    #[must_use]
+    pub fn arg(mut self, a: impl Into<Arg>) -> Self {
+        let arg = a.into();
+        self.arg_internal(arg);
+        self
+    }
+
+    fn arg_internal(&mut self, mut arg: Arg) {
+        if let Some(current_disp_ord) = self.current_disp_ord.as_mut() {
+            if !arg.is_positional() {
+                let current = *current_disp_ord;
+                arg.disp_ord.get_or_insert(current);
+                *current_disp_ord = current + 1;
+            }
+        }
+
+        arg.help_heading
+            .get_or_insert_with(|| self.current_help_heading.clone());
+        self.args.push(arg);
+    }
+
+    /// Adds multiple [arguments] to the list of valid possibilities.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg, Arg};
+    /// Command::new("myprog")
+    ///     .args([
+    ///         arg!(-d --debug "turns on debugging info"),
+    ///         Arg::new("input").help("the input file to use")
+    ///     ])
+    /// # ;
+    /// ```
+    /// [arguments]: Arg
+    #[must_use]
+    pub fn args(mut self, args: impl IntoIterator<Item = impl Into<Arg>>) -> Self {
+        for arg in args {
+            self = self.arg(arg);
+        }
+        self
+    }
+
+    /// Allows one to mutate an [`Arg`] after it's been added to a [`Command`].
+    ///
+    /// # Panics
+    ///
+    /// If the argument is undefined
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    ///
+    /// let mut cmd = Command::new("foo")
+    ///     .arg(Arg::new("bar")
+    ///         .short('b')
+    ///         .action(ArgAction::SetTrue))
+    ///     .mut_arg("bar", |a| a.short('B'));
+    ///
+    /// let res = cmd.try_get_matches_from_mut(vec!["foo", "-b"]);
+    ///
+    /// // Since we changed `bar`'s short to "B" this should err as there
+    /// // is no `-b` anymore, only `-B`
+    ///
+    /// assert!(res.is_err());
+    ///
+    /// let res = cmd.try_get_matches_from_mut(vec!["foo", "-B"]);
+    /// assert!(res.is_ok());
+    /// ```
+    #[must_use]
+    #[cfg_attr(debug_assertions, track_caller)]
+    pub fn mut_arg<F>(mut self, arg_id: impl AsRef<str>, f: F) -> Self
+    where
+        F: FnOnce(Arg) -> Arg,
+    {
+        let id = arg_id.as_ref();
+        let a = self
+            .args
+            .remove_by_name(id)
+            .unwrap_or_else(|| panic!("Argument `{id}` is undefined"));
+
+        self.args.push(f(a));
+        self
+    }
+
+    /// Allows one to mutate all [`Arg`]s after they've been added to a [`Command`].
+    ///
+    /// This does not affect the built-in `--help` or `--version` arguments.
+    ///
+    /// # Examples
+    ///
+    #[cfg_attr(feature = "string", doc = "```")]
+    #[cfg_attr(not(feature = "string"), doc = "```ignore")]
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    ///
+    /// let mut cmd = Command::new("foo")
+    ///     .arg(Arg::new("bar")
+    ///         .long("bar")
+    ///         .action(ArgAction::SetTrue))
+    ///     .arg(Arg::new("baz")
+    ///         .long("baz")
+    ///         .action(ArgAction::SetTrue))
+    ///     .mut_args(|a| {
+    ///         if let Some(l) = a.get_long().map(|l| format!("prefix-{l}")) {
+    ///             a.long(l)
+    ///         } else {
+    ///             a
+    ///         }
+    ///     });
+    ///
+    /// let res = cmd.try_get_matches_from_mut(vec!["foo", "--bar"]);
+    ///
+    /// // Since we changed `bar`'s long to "prefix-bar" this should err as there
+    /// // is no `--bar` anymore, only `--prefix-bar`.
+    ///
+    /// assert!(res.is_err());
+    ///
+    /// let res = cmd.try_get_matches_from_mut(vec!["foo", "--prefix-bar"]);
+    /// assert!(res.is_ok());
+    /// ```
+    #[must_use]
+    #[cfg_attr(debug_assertions, track_caller)]
+    pub fn mut_args<F>(mut self, f: F) -> Self
+    where
+        F: FnMut(Arg) -> Arg,
+    {
+        self.args.mut_args(f);
+        self
+    }
+
+    /// Allows one to mutate an [`ArgGroup`] after it's been added to a [`Command`].
+    ///
+    /// # Panics
+    ///
+    /// If the argument is undefined
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg, ArgGroup};
+    ///
+    /// Command::new("foo")
+    ///     .arg(arg!(--"set-ver" <ver> "set the version manually").required(false))
+    ///     .arg(arg!(--major "auto increase major"))
+    ///     .arg(arg!(--minor "auto increase minor"))
+    ///     .arg(arg!(--patch "auto increase patch"))
+    ///     .group(ArgGroup::new("vers")
+    ///          .args(["set-ver", "major", "minor","patch"])
+    ///          .required(true))
+    ///     .mut_group("vers", |a| a.required(false));
+    /// ```
+    #[must_use]
+    #[cfg_attr(debug_assertions, track_caller)]
+    pub fn mut_group<F>(mut self, arg_id: impl AsRef<str>, f: F) -> Self
+    where
+        F: FnOnce(ArgGroup) -> ArgGroup,
+    {
+        let id = arg_id.as_ref();
+        let index = self
+            .groups
+            .iter()
+            .position(|g| g.get_id() == id)
+            .unwrap_or_else(|| panic!("Group `{id}` is undefined"));
+        let a = self.groups.remove(index);
+
+        self.groups.push(f(a));
+        self
+    }
+    /// Allows one to mutate a [`Command`] after it's been added as a subcommand.
+    ///
+    /// This can be useful for modifying auto-generated arguments of nested subcommands with
+    /// [`Command::mut_arg`].
+    ///
+    /// # Panics
+    ///
+    /// If the subcommand is undefined
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    ///
+    /// let mut cmd = Command::new("foo")
+    ///         .subcommand(Command::new("bar"))
+    ///         .mut_subcommand("bar", |subcmd| subcmd.disable_help_flag(true));
+    ///
+    /// let res = cmd.try_get_matches_from_mut(vec!["foo", "bar", "--help"]);
+    ///
+    /// // Since we disabled the help flag on the "bar" subcommand, this should err.
+    ///
+    /// assert!(res.is_err());
+    ///
+    /// let res = cmd.try_get_matches_from_mut(vec!["foo", "bar"]);
+    /// assert!(res.is_ok());
+    /// ```
+    #[must_use]
+    pub fn mut_subcommand<F>(mut self, name: impl AsRef<str>, f: F) -> Self
+    where
+        F: FnOnce(Self) -> Self,
+    {
+        let name = name.as_ref();
+        let pos = self.subcommands.iter().position(|s| s.name == name);
+
+        let subcmd = if let Some(idx) = pos {
+            self.subcommands.remove(idx)
+        } else {
+            panic!("Command `{name}` is undefined")
+        };
+
+        self.subcommands.push(f(subcmd));
+        self
+    }
+
+    /// Adds an [`ArgGroup`] to the application.
+    ///
+    /// [`ArgGroup`]s are a family of related arguments.
+    /// By placing them in a logical group, you can build easier requirement and exclusion rules.
+    ///
+    /// Example use cases:
+    /// - Make an entire [`ArgGroup`] required, meaning that one (and *only*
+    ///   one) argument from that group must be present at runtime.
+    /// - Name an [`ArgGroup`] as a conflict to another argument.
+    ///   Meaning any of the arguments that belong to that group will cause a failure if present with
+    ///   the conflicting argument.
+    /// - Ensure exclusion between arguments.
+    /// - Extract a value from a group instead of determining exactly which argument was used.
+    ///
+    /// # Examples
+    ///
+    /// The following example demonstrates using an [`ArgGroup`] to ensure that one, and only one,
+    /// of the arguments from the specified group is present at runtime.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg, ArgGroup};
+    /// Command::new("cmd")
+    ///     .arg(arg!(--"set-ver" <ver> "set the version manually").required(false))
+    ///     .arg(arg!(--major "auto increase major"))
+    ///     .arg(arg!(--minor "auto increase minor"))
+    ///     .arg(arg!(--patch "auto increase patch"))
+    ///     .group(ArgGroup::new("vers")
+    ///          .args(["set-ver", "major", "minor","patch"])
+    ///          .required(true))
+    /// # ;
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn group(mut self, group: impl Into<ArgGroup>) -> Self {
+        self.groups.push(group.into());
+        self
+    }
+
+    /// Adds multiple [`ArgGroup`]s to the [`Command`] at once.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg, ArgGroup};
+    /// Command::new("cmd")
+    ///     .arg(arg!(--"set-ver" <ver> "set the version manually").required(false))
+    ///     .arg(arg!(--major         "auto increase major"))
+    ///     .arg(arg!(--minor         "auto increase minor"))
+    ///     .arg(arg!(--patch         "auto increase patch"))
+    ///     .arg(arg!(-c <FILE>       "a config file").required(false))
+    ///     .arg(arg!(-i <IFACE>      "an interface").required(false))
+    ///     .groups([
+    ///         ArgGroup::new("vers")
+    ///             .args(["set-ver", "major", "minor","patch"])
+    ///             .required(true),
+    ///         ArgGroup::new("input")
+    ///             .args(["c", "i"])
+    ///     ])
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn groups(mut self, groups: impl IntoIterator<Item = impl Into<ArgGroup>>) -> Self {
+        for g in groups.into_iter() {
+            self = self.group(g.into());
+        }
+        self
+    }
+
+    /// Adds a subcommand to the list of valid possibilities.
+    ///
+    /// Subcommands are effectively sub-[`Command`]s, because they can contain their own arguments,
+    /// subcommands, version, usage, etc. They also function just like [`Command`]s, in that they get
+    /// their own auto generated help, version, and usage.
+    ///
+    /// A subcommand's [`Command::name`] will be used for:
+    /// - The argument the user passes in
+    /// - Programmatically looking up the subcommand
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg};
+    /// Command::new("myprog")
+    ///     .subcommand(Command::new("config")
+    ///         .about("Controls configuration features")
+    ///         .arg(arg!(<config> "Required configuration file to use")))
+    /// # ;
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn subcommand(self, subcmd: impl Into<Command>) -> Self {
+        let subcmd = subcmd.into();
+        self.subcommand_internal(subcmd)
+    }
+
+    fn subcommand_internal(mut self, mut subcmd: Self) -> Self {
+        if let Some(current_disp_ord) = self.current_disp_ord.as_mut() {
+            let current = *current_disp_ord;
+            subcmd.disp_ord.get_or_insert(current);
+            *current_disp_ord = current + 1;
+        }
+        self.subcommands.push(subcmd);
+        self
+    }
+
+    /// Adds multiple subcommands to the list of valid possibilities.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// # Command::new("myprog")
+    /// .subcommands( [
+    ///        Command::new("config").about("Controls configuration functionality")
+    ///                                 .arg(Arg::new("config_file")),
+    ///        Command::new("debug").about("Controls debug functionality")])
+    /// # ;
+    /// ```
+    /// [`IntoIterator`]: std::iter::IntoIterator
+    #[must_use]
+    pub fn subcommands(mut self, subcmds: impl IntoIterator<Item = impl Into<Self>>) -> Self {
+        for subcmd in subcmds {
+            self = self.subcommand(subcmd);
+        }
+        self
+    }
+
+    /// Delay initialization for parts of the `Command`
+    ///
+    /// This is useful for large applications to delay definitions of subcommands until they are
+    /// being invoked.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg};
+    /// Command::new("myprog")
+    ///     .subcommand(Command::new("config")
+    ///         .about("Controls configuration features")
+    ///         .defer(|cmd| {
+    ///             cmd.arg(arg!(<config> "Required configuration file to use"))
+    ///         })
+    ///     )
+    /// # ;
+    /// ```
+    pub fn defer(mut self, deferred: fn(Command) -> Command) -> Self {
+        self.deferred = Some(deferred);
+        self
+    }
+
+    /// Catch problems earlier in the development cycle.
+    ///
+    /// Most error states are handled as asserts under the assumption they are programming mistake
+    /// and not something to handle at runtime.  Rather than relying on tests (manual or automated)
+    /// that exhaustively test your CLI to ensure the asserts are evaluated, this will run those
+    /// asserts in a way convenient for running as a test.
+    ///
+    /// **Note::** This will not help with asserts in [`ArgMatches`], those will need exhaustive
+    /// testing of your CLI.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// fn cmd() -> Command {
+    ///     Command::new("foo")
+    ///         .arg(
+    ///             Arg::new("bar").short('b').action(ArgAction::SetTrue)
+    ///         )
+    /// }
+    ///
+    /// #[test]
+    /// fn verify_app() {
+    ///     cmd().debug_assert();
+    /// }
+    ///
+    /// fn main() {
+    ///     let m = cmd().get_matches_from(vec!["foo", "-b"]);
+    ///     println!("{}", m.get_flag("bar"));
+    /// }
+    /// ```
+    pub fn debug_assert(mut self) {
+        self.build();
+    }
+
+    /// Custom error message for post-parsing validation
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, error::ErrorKind};
+    /// let mut cmd = Command::new("myprog");
+    /// let err = cmd.error(ErrorKind::InvalidValue, "Some failure case");
+    /// ```
+    pub fn error(&mut self, kind: ErrorKind, message: impl std::fmt::Display) -> Error {
+        Error::raw(kind, message).format(self)
+    }
+
+    /// Parse [`env::args_os`], exiting on failure.
+    ///
+    /// # Panics
+    ///
+    /// If contradictory arguments or settings exist (debug builds).
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let matches = Command::new("myprog")
+    ///     // Args and options go here...
+    ///     .get_matches();
+    /// ```
+    /// [`env::args_os`]: std::env::args_os()
+    /// [`Command::try_get_matches_from_mut`]: Command::try_get_matches_from_mut()
+    #[inline]
+    pub fn get_matches(self) -> ArgMatches {
+        self.get_matches_from(env::args_os())
+    }
+
+    /// Parse [`env::args_os`], exiting on failure.
+    ///
+    /// Like [`Command::get_matches`] but doesn't consume the `Command`.
+    ///
+    /// # Panics
+    ///
+    /// If contradictory arguments or settings exist (debug builds).
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let mut cmd = Command::new("myprog")
+    ///     // Args and options go here...
+    ///     ;
+    /// let matches = cmd.get_matches_mut();
+    /// ```
+    /// [`env::args_os`]: std::env::args_os()
+    /// [`Command::get_matches`]: Command::get_matches()
+    pub fn get_matches_mut(&mut self) -> ArgMatches {
+        self.try_get_matches_from_mut(&mut env::args_os())
+            .unwrap_or_else(|e| e.exit())
+    }
+
+    /// Parse [`env::args_os`], returning a [`clap::Result`] on failure.
+    ///
+    /// **NOTE:** This method WILL NOT exit when `--help` or `--version` (or short versions) are
+    /// used. It will return a [`clap::Error`], where the [`kind`] is a
+    /// [`ErrorKind::DisplayHelp`] or [`ErrorKind::DisplayVersion`] respectively. You must call
+    /// [`Error::exit`] or perform a [`std::process::exit`].
+    ///
+    /// # Panics
+    ///
+    /// If contradictory arguments or settings exist (debug builds).
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let matches = Command::new("myprog")
+    ///     // Args and options go here...
+    ///     .try_get_matches()
+    ///     .unwrap_or_else(|e| e.exit());
+    /// ```
+    /// [`env::args_os`]: std::env::args_os()
+    /// [`Error::exit`]: crate::Error::exit()
+    /// [`std::process::exit`]: std::process::exit()
+    /// [`clap::Result`]: Result
+    /// [`clap::Error`]: crate::Error
+    /// [`kind`]: crate::Error
+    /// [`ErrorKind::DisplayHelp`]: crate::error::ErrorKind::DisplayHelp
+    /// [`ErrorKind::DisplayVersion`]: crate::error::ErrorKind::DisplayVersion
+    #[inline]
+    pub fn try_get_matches(self) -> ClapResult<ArgMatches> {
+        // Start the parsing
+        self.try_get_matches_from(env::args_os())
+    }
+
+    /// Parse the specified arguments, exiting on failure.
+    ///
+    /// **NOTE:** The first argument will be parsed as the binary name unless
+    /// [`Command::no_binary_name`] is used.
+    ///
+    /// # Panics
+    ///
+    /// If contradictory arguments or settings exist (debug builds).
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let arg_vec = vec!["my_prog", "some", "args", "to", "parse"];
+    ///
+    /// let matches = Command::new("myprog")
+    ///     // Args and options go here...
+    ///     .get_matches_from(arg_vec);
+    /// ```
+    /// [`Command::get_matches`]: Command::get_matches()
+    /// [`clap::Result`]: Result
+    /// [`Vec`]: std::vec::Vec
+    pub fn get_matches_from<I, T>(mut self, itr: I) -> ArgMatches
+    where
+        I: IntoIterator<Item = T>,
+        T: Into<OsString> + Clone,
+    {
+        self.try_get_matches_from_mut(itr).unwrap_or_else(|e| {
+            drop(self);
+            e.exit()
+        })
+    }
+
+    /// Parse the specified arguments, returning a [`clap::Result`] on failure.
+    ///
+    /// **NOTE:** This method WILL NOT exit when `--help` or `--version` (or short versions) are
+    /// used. It will return a [`clap::Error`], where the [`kind`] is a [`ErrorKind::DisplayHelp`]
+    /// or [`ErrorKind::DisplayVersion`] respectively. You must call [`Error::exit`] or
+    /// perform a [`std::process::exit`] yourself.
+    ///
+    /// **NOTE:** The first argument will be parsed as the binary name unless
+    /// [`Command::no_binary_name`] is used.
+    ///
+    /// # Panics
+    ///
+    /// If contradictory arguments or settings exist (debug builds).
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let arg_vec = vec!["my_prog", "some", "args", "to", "parse"];
+    ///
+    /// let matches = Command::new("myprog")
+    ///     // Args and options go here...
+    ///     .try_get_matches_from(arg_vec)
+    ///     .unwrap_or_else(|e| e.exit());
+    /// ```
+    /// [`Command::get_matches_from`]: Command::get_matches_from()
+    /// [`Command::try_get_matches`]: Command::try_get_matches()
+    /// [`Error::exit`]: crate::Error::exit()
+    /// [`std::process::exit`]: std::process::exit()
+    /// [`clap::Error`]: crate::Error
+    /// [`Error::exit`]: crate::Error::exit()
+    /// [`kind`]: crate::Error
+    /// [`ErrorKind::DisplayHelp`]: crate::error::ErrorKind::DisplayHelp
+    /// [`ErrorKind::DisplayVersion`]: crate::error::ErrorKind::DisplayVersion
+    /// [`clap::Result`]: Result
+    pub fn try_get_matches_from<I, T>(mut self, itr: I) -> ClapResult<ArgMatches>
+    where
+        I: IntoIterator<Item = T>,
+        T: Into<OsString> + Clone,
+    {
+        self.try_get_matches_from_mut(itr)
+    }
+
+    /// Parse the specified arguments, returning a [`clap::Result`] on failure.
+    ///
+    /// Like [`Command::try_get_matches_from`] but doesn't consume the `Command`.
+    ///
+    /// **NOTE:** This method WILL NOT exit when `--help` or `--version` (or short versions) are
+    /// used. It will return a [`clap::Error`], where the [`kind`] is a [`ErrorKind::DisplayHelp`]
+    /// or [`ErrorKind::DisplayVersion`] respectively. You must call [`Error::exit`] or
+    /// perform a [`std::process::exit`] yourself.
+    ///
+    /// **NOTE:** The first argument will be parsed as the binary name unless
+    /// [`Command::no_binary_name`] is used.
+    ///
+    /// # Panics
+    ///
+    /// If contradictory arguments or settings exist (debug builds).
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let arg_vec = vec!["my_prog", "some", "args", "to", "parse"];
+    ///
+    /// let mut cmd = Command::new("myprog");
+    ///     // Args and options go here...
+    /// let matches = cmd.try_get_matches_from_mut(arg_vec)
+    ///     .unwrap_or_else(|e| e.exit());
+    /// ```
+    /// [`Command::try_get_matches_from`]: Command::try_get_matches_from()
+    /// [`clap::Result`]: Result
+    /// [`clap::Error`]: crate::Error
+    /// [`kind`]: crate::Error
+    pub fn try_get_matches_from_mut<I, T>(&mut self, itr: I) -> ClapResult<ArgMatches>
+    where
+        I: IntoIterator<Item = T>,
+        T: Into<OsString> + Clone,
+    {
+        let mut raw_args = clap_lex::RawArgs::new(itr);
+        let mut cursor = raw_args.cursor();
+
+        if self.settings.is_set(AppSettings::Multicall) {
+            if let Some(argv0) = raw_args.next_os(&mut cursor) {
+                let argv0 = Path::new(&argv0);
+                if let Some(command) = argv0.file_stem().and_then(|f| f.to_str()) {
+                    // Stop borrowing command so we can get another mut ref to it.
+                    let command = command.to_owned();
+                    debug!("Command::try_get_matches_from_mut: Parsed command {command} from argv");
+
+                    debug!("Command::try_get_matches_from_mut: Reinserting command into arguments so subcommand parser matches it");
+                    raw_args.insert(&cursor, [&command]);
+                    debug!("Command::try_get_matches_from_mut: Clearing name and bin_name so that displayed command name starts with applet name");
+                    self.name = "".into();
+                    self.bin_name = None;
+                    return self._do_parse(&mut raw_args, cursor);
+                }
+            }
+        };
+
+        // Get the name of the program (argument 1 of env::args()) and determine the
+        // actual file
+        // that was used to execute the program. This is because a program called
+        // ./target/release/my_prog -a
+        // will have two arguments, './target/release/my_prog', '-a' but we don't want
+        // to display
+        // the full path when displaying help messages and such
+        if !self.settings.is_set(AppSettings::NoBinaryName) {
+            if let Some(name) = raw_args.next_os(&mut cursor) {
+                let p = Path::new(name);
+
+                if let Some(f) = p.file_name() {
+                    if let Some(s) = f.to_str() {
+                        if self.bin_name.is_none() {
+                            self.bin_name = Some(s.to_owned());
+                        }
+                    }
+                }
+            }
+        }
+
+        self._do_parse(&mut raw_args, cursor)
+    }
+
+    /// Prints the short help message (`-h`) to [`io::stdout()`].
+    ///
+    /// See also [`Command::print_long_help`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// let mut cmd = Command::new("myprog");
+    /// cmd.print_help();
+    /// ```
+    /// [`io::stdout()`]: std::io::stdout()
+    pub fn print_help(&mut self) -> io::Result<()> {
+        self._build_self(false);
+        let color = self.color_help();
+
+        let mut styled = StyledStr::new();
+        let usage = Usage::new(self);
+        write_help(&mut styled, self, &usage, false);
+
+        let c = Colorizer::new(Stream::Stdout, color).with_content(styled);
+        c.print()
+    }
+
+    /// Prints the long help message (`--help`) to [`io::stdout()`].
+    ///
+    /// See also [`Command::print_help`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// let mut cmd = Command::new("myprog");
+    /// cmd.print_long_help();
+    /// ```
+    /// [`io::stdout()`]: std::io::stdout()
+    /// [`BufWriter`]: std::io::BufWriter
+    /// [`-h` (short)]: Arg::help()
+    /// [`--help` (long)]: Arg::long_help()
+    pub fn print_long_help(&mut self) -> io::Result<()> {
+        self._build_self(false);
+        let color = self.color_help();
+
+        let mut styled = StyledStr::new();
+        let usage = Usage::new(self);
+        write_help(&mut styled, self, &usage, true);
+
+        let c = Colorizer::new(Stream::Stdout, color).with_content(styled);
+        c.print()
+    }
+
+    /// Render the short help message (`-h`) to a [`StyledStr`]
+    ///
+    /// See also [`Command::render_long_help`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// use std::io;
+    /// let mut cmd = Command::new("myprog");
+    /// let mut out = io::stdout();
+    /// let help = cmd.render_help();
+    /// println!("{help}");
+    /// ```
+    /// [`io::Write`]: std::io::Write
+    /// [`-h` (short)]: Arg::help()
+    /// [`--help` (long)]: Arg::long_help()
+    pub fn render_help(&mut self) -> StyledStr {
+        self._build_self(false);
+
+        let mut styled = StyledStr::new();
+        let usage = Usage::new(self);
+        write_help(&mut styled, self, &usage, false);
+        styled
+    }
+
+    /// Render the long help message (`--help`) to a [`StyledStr`].
+    ///
+    /// See also [`Command::render_help`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// use std::io;
+    /// let mut cmd = Command::new("myprog");
+    /// let mut out = io::stdout();
+    /// let help = cmd.render_long_help();
+    /// println!("{help}");
+    /// ```
+    /// [`io::Write`]: std::io::Write
+    /// [`-h` (short)]: Arg::help()
+    /// [`--help` (long)]: Arg::long_help()
+    pub fn render_long_help(&mut self) -> StyledStr {
+        self._build_self(false);
+
+        let mut styled = StyledStr::new();
+        let usage = Usage::new(self);
+        write_help(&mut styled, self, &usage, true);
+        styled
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Command::render_help`")
+    )]
+    pub fn write_help<W: io::Write>(&mut self, w: &mut W) -> io::Result<()> {
+        self._build_self(false);
+
+        let mut styled = StyledStr::new();
+        let usage = Usage::new(self);
+        write_help(&mut styled, self, &usage, false);
+        ok!(write!(w, "{styled}"));
+        w.flush()
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Command::render_long_help`")
+    )]
+    pub fn write_long_help<W: io::Write>(&mut self, w: &mut W) -> io::Result<()> {
+        self._build_self(false);
+
+        let mut styled = StyledStr::new();
+        let usage = Usage::new(self);
+        write_help(&mut styled, self, &usage, true);
+        ok!(write!(w, "{styled}"));
+        w.flush()
+    }
+
+    /// Version message rendered as if the user ran `-V`.
+    ///
+    /// See also [`Command::render_long_version`].
+    ///
+    /// ### Coloring
+    ///
+    /// This function does not try to color the message nor it inserts any [ANSI escape codes].
+    ///
+    /// ### Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// use std::io;
+    /// let cmd = Command::new("myprog");
+    /// println!("{}", cmd.render_version());
+    /// ```
+    /// [`io::Write`]: std::io::Write
+    /// [`-V` (short)]: Command::version()
+    /// [`--version` (long)]: Command::long_version()
+    /// [ANSI escape codes]: https://en.wikipedia.org/wiki/ANSI_escape_code
+    pub fn render_version(&self) -> String {
+        self._render_version(false)
+    }
+
+    /// Version message rendered as if the user ran `--version`.
+    ///
+    /// See also [`Command::render_version`].
+    ///
+    /// ### Coloring
+    ///
+    /// This function does not try to color the message nor it inserts any [ANSI escape codes].
+    ///
+    /// ### Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// use std::io;
+    /// let cmd = Command::new("myprog");
+    /// println!("{}", cmd.render_long_version());
+    /// ```
+    /// [`io::Write`]: std::io::Write
+    /// [`-V` (short)]: Command::version()
+    /// [`--version` (long)]: Command::long_version()
+    /// [ANSI escape codes]: https://en.wikipedia.org/wiki/ANSI_escape_code
+    pub fn render_long_version(&self) -> String {
+        self._render_version(true)
+    }
+
+    /// Usage statement
+    ///
+    /// ### Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// use std::io;
+    /// let mut cmd = Command::new("myprog");
+    /// println!("{}", cmd.render_usage());
+    /// ```
+    pub fn render_usage(&mut self) -> StyledStr {
+        self.render_usage_().unwrap_or_default()
+    }
+
+    pub(crate) fn render_usage_(&mut self) -> Option<StyledStr> {
+        // If there are global arguments, or settings we need to propagate them down to subcommands
+        // before parsing incase we run into a subcommand
+        self._build_self(false);
+
+        Usage::new(self).create_usage_with_title(&[])
+    }
+}
+
+/// # Application-wide Settings
+///
+/// These settings will apply to the top-level command and all subcommands, by default.  Some
+/// settings can be overridden in subcommands.
+impl Command {
+    /// Specifies that the parser should not assume the first argument passed is the binary name.
+    ///
+    /// This is normally the case when using a "daemon" style mode.  For shells / REPLs, see
+    /// [`Command::multicall`][Command::multicall].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg};
+    /// let m = Command::new("myprog")
+    ///     .no_binary_name(true)
+    ///     .arg(arg!(<cmd> ... "commands to run"))
+    ///     .get_matches_from(vec!["command", "set"]);
+    ///
+    /// let cmds: Vec<_> = m.get_many::<String>("cmd").unwrap().collect();
+    /// assert_eq!(cmds, ["command", "set"]);
+    /// ```
+    /// [`try_get_matches_from_mut`]: crate::Command::try_get_matches_from_mut()
+    #[inline]
+    pub fn no_binary_name(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::NoBinaryName)
+        } else {
+            self.unset_global_setting(AppSettings::NoBinaryName)
+        }
+    }
+
+    /// Try not to fail on parse errors, like missing option values.
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, arg};
+    /// let cmd = Command::new("cmd")
+    ///   .ignore_errors(true)
+    ///   .arg(arg!(-c --config <FILE> "Sets a custom config file"))
+    ///   .arg(arg!(-x --stuff <FILE> "Sets a custom stuff file"))
+    ///   .arg(arg!(f: -f "Flag"));
+    ///
+    /// let r = cmd.try_get_matches_from(vec!["cmd", "-c", "file", "-f", "-x"]);
+    ///
+    /// assert!(r.is_ok(), "unexpected error: {r:?}");
+    /// let m = r.unwrap();
+    /// assert_eq!(m.get_one::<String>("config").unwrap(), "file");
+    /// assert!(m.get_flag("f"));
+    /// assert_eq!(m.get_one::<String>("stuff"), None);
+    /// ```
+    #[inline]
+    pub fn ignore_errors(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::IgnoreErrors)
+        } else {
+            self.unset_global_setting(AppSettings::IgnoreErrors)
+        }
+    }
+
+    /// Replace prior occurrences of arguments rather than error
+    ///
+    /// For any argument that would conflict with itself by default (e.g.
+    /// [`ArgAction::Set`], it will now override itself.
+    ///
+    /// This is the equivalent to saying the `foo` arg using [`Arg::overrides_with("foo")`] for all
+    /// defined arguments.
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// [`Arg::overrides_with("foo")`]: crate::Arg::overrides_with()
+    #[inline]
+    pub fn args_override_self(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::AllArgsOverrideSelf)
+        } else {
+            self.unset_global_setting(AppSettings::AllArgsOverrideSelf)
+        }
+    }
+
+    /// Disables the automatic delimiting of values after `--` or when [`Command::trailing_var_arg`]
+    /// was used.
+    ///
+    /// **NOTE:** The same thing can be done manually by setting the final positional argument to
+    /// [`Arg::value_delimiter(None)`]. Using this setting is safer, because it's easier to locate
+    /// when making changes.
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .dont_delimit_trailing_values(true)
+    ///     .get_matches();
+    /// ```
+    ///
+    /// [`Arg::value_delimiter(None)`]: crate::Arg::value_delimiter()
+    #[inline]
+    pub fn dont_delimit_trailing_values(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::DontDelimitTrailingValues)
+        } else {
+            self.unset_global_setting(AppSettings::DontDelimitTrailingValues)
+        }
+    }
+
+    /// Sets when to color output.
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// **NOTE:** Default behaviour is [`ColorChoice::Auto`].
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, ColorChoice};
+    /// Command::new("myprog")
+    ///     .color(ColorChoice::Never)
+    ///     .get_matches();
+    /// ```
+    /// [`ColorChoice::Auto`]: crate::ColorChoice::Auto
+    #[cfg(feature = "color")]
+    #[inline]
+    #[must_use]
+    pub fn color(self, color: ColorChoice) -> Self {
+        let cmd = self
+            .unset_global_setting(AppSettings::ColorAuto)
+            .unset_global_setting(AppSettings::ColorAlways)
+            .unset_global_setting(AppSettings::ColorNever);
+        match color {
+            ColorChoice::Auto => cmd.global_setting(AppSettings::ColorAuto),
+            ColorChoice::Always => cmd.global_setting(AppSettings::ColorAlways),
+            ColorChoice::Never => cmd.global_setting(AppSettings::ColorNever),
+        }
+    }
+
+    /// Sets the [`Styles`] for terminal output
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// **NOTE:** Default behaviour is [`Styles::default`].
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, ColorChoice, builder::styling};
+    /// let styles = styling::Styles::styled()
+    ///     .header(styling::AnsiColor::Green.on_default() | styling::Effects::BOLD)
+    ///     .usage(styling::AnsiColor::Green.on_default() | styling::Effects::BOLD)
+    ///     .literal(styling::AnsiColor::Blue.on_default() | styling::Effects::BOLD)
+    ///     .placeholder(styling::AnsiColor::Cyan.on_default());
+    /// Command::new("myprog")
+    ///     .styles(styles)
+    ///     .get_matches();
+    /// ```
+    #[cfg(feature = "color")]
+    #[inline]
+    #[must_use]
+    pub fn styles(mut self, styles: Styles) -> Self {
+        self.app_ext.set(styles);
+        self
+    }
+
+    /// Sets the terminal width at which to wrap help messages.
+    ///
+    /// Using `0` will ignore terminal widths and use source formatting.
+    ///
+    /// Defaults to current terminal width when `wrap_help` feature flag is enabled.  If current
+    /// width cannot be determined, the default is 100.
+    ///
+    /// **`unstable-v5` feature**: Defaults to unbound, being subject to
+    /// [`Command::max_term_width`].
+    ///
+    /// **NOTE:** This setting applies globally and *not* on a per-command basis.
+    ///
+    /// **NOTE:** This requires the `wrap_help` feature
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .term_width(80)
+    /// # ;
+    /// ```
+    #[inline]
+    #[must_use]
+    #[cfg(any(not(feature = "unstable-v5"), feature = "wrap_help"))]
+    pub fn term_width(mut self, width: usize) -> Self {
+        self.app_ext.set(TermWidth(width));
+        self
+    }
+
+    /// Limit the line length for wrapping help when using the current terminal's width.
+    ///
+    /// This only applies when [`term_width`][Command::term_width] is unset so that the current
+    /// terminal's width will be used.  See [`Command::term_width`] for more details.
+    ///
+    /// Using `0` will ignore this, always respecting [`Command::term_width`] (default).
+    ///
+    /// **`unstable-v5` feature**: Defaults to 100.
+    ///
+    /// **NOTE:** This setting applies globally and *not* on a per-command basis.
+    ///
+    /// **NOTE:** This requires the `wrap_help` feature
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .max_term_width(100)
+    /// # ;
+    /// ```
+    #[inline]
+    #[must_use]
+    #[cfg(any(not(feature = "unstable-v5"), feature = "wrap_help"))]
+    pub fn max_term_width(mut self, width: usize) -> Self {
+        self.app_ext.set(MaxTermWidth(width));
+        self
+    }
+
+    /// Disables `-V` and `--version` flag.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, error::ErrorKind};
+    /// let res = Command::new("myprog")
+    ///     .version("1.0.0")
+    ///     .disable_version_flag(true)
+    ///     .try_get_matches_from(vec![
+    ///         "myprog", "--version"
+    ///     ]);
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::UnknownArgument);
+    /// ```
+    ///
+    /// You can create a custom version flag with [`ArgAction::Version`]
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction, error::ErrorKind};
+    /// let mut cmd = Command::new("myprog")
+    ///     .version("1.0.0")
+    ///     // Remove the `-V` short flag
+    ///     .disable_version_flag(true)
+    ///     .arg(
+    ///         Arg::new("version")
+    ///             .long("version")
+    ///             .action(ArgAction::Version)
+    ///             .help("Print version")
+    ///     );
+    ///
+    /// let res = cmd.try_get_matches_from_mut(vec![
+    ///         "myprog", "-V"
+    ///     ]);
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::UnknownArgument);
+    ///
+    /// let res = cmd.try_get_matches_from_mut(vec![
+    ///         "myprog", "--version"
+    ///     ]);
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::DisplayVersion);
+    /// ```
+    #[inline]
+    pub fn disable_version_flag(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::DisableVersionFlag)
+        } else {
+            self.unset_global_setting(AppSettings::DisableVersionFlag)
+        }
+    }
+
+    /// Specifies to use the version of the current command for all [`subcommands`].
+    ///
+    /// Defaults to `false`; subcommands have independent version strings from their parents.
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .version("v1.1")
+    ///     .propagate_version(true)
+    ///     .subcommand(Command::new("test"))
+    ///     .get_matches();
+    /// // running `$ myprog test --version` will display
+    /// // "myprog-test v1.1"
+    /// ```
+    ///
+    /// [`subcommands`]: crate::Command::subcommand()
+    #[inline]
+    pub fn propagate_version(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::PropagateVersion)
+        } else {
+            self.unset_global_setting(AppSettings::PropagateVersion)
+        }
+    }
+
+    /// Places the help string for all arguments and subcommands on the line after them.
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .next_line_help(true)
+    ///     .get_matches();
+    /// ```
+    #[inline]
+    pub fn next_line_help(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::NextLineHelp)
+        } else {
+            self.unset_global_setting(AppSettings::NextLineHelp)
+        }
+    }
+
+    /// Disables `-h` and `--help` flag.
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, error::ErrorKind};
+    /// let res = Command::new("myprog")
+    ///     .disable_help_flag(true)
+    ///     .try_get_matches_from(vec![
+    ///         "myprog", "-h"
+    ///     ]);
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::UnknownArgument);
+    /// ```
+    ///
+    /// You can create a custom help flag with [`ArgAction::Help`], [`ArgAction::HelpShort`], or
+    /// [`ArgAction::HelpLong`]
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction, error::ErrorKind};
+    /// let mut cmd = Command::new("myprog")
+    ///     // Change help short flag to `?`
+    ///     .disable_help_flag(true)
+    ///     .arg(
+    ///         Arg::new("help")
+    ///             .short('?')
+    ///             .long("help")
+    ///             .action(ArgAction::Help)
+    ///             .help("Print help")
+    ///     );
+    ///
+    /// let res = cmd.try_get_matches_from_mut(vec![
+    ///         "myprog", "-h"
+    ///     ]);
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::UnknownArgument);
+    ///
+    /// let res = cmd.try_get_matches_from_mut(vec![
+    ///         "myprog", "-?"
+    ///     ]);
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::DisplayHelp);
+    /// ```
+    #[inline]
+    pub fn disable_help_flag(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::DisableHelpFlag)
+        } else {
+            self.unset_global_setting(AppSettings::DisableHelpFlag)
+        }
+    }
+
+    /// Disables the `help` [`subcommand`].
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, error::ErrorKind};
+    /// let res = Command::new("myprog")
+    ///     .disable_help_subcommand(true)
+    ///     // Normally, creating a subcommand causes a `help` subcommand to automatically
+    ///     // be generated as well
+    ///     .subcommand(Command::new("test"))
+    ///     .try_get_matches_from(vec![
+    ///         "myprog", "help"
+    ///     ]);
+    /// assert!(res.is_err());
+    /// assert_eq!(res.unwrap_err().kind(), ErrorKind::InvalidSubcommand);
+    /// ```
+    ///
+    /// [`subcommand`]: crate::Command::subcommand()
+    #[inline]
+    pub fn disable_help_subcommand(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::DisableHelpSubcommand)
+        } else {
+            self.unset_global_setting(AppSettings::DisableHelpSubcommand)
+        }
+    }
+
+    /// Disables colorized help messages.
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .disable_colored_help(true)
+    ///     .get_matches();
+    /// ```
+    #[inline]
+    pub fn disable_colored_help(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::DisableColoredHelp)
+        } else {
+            self.unset_global_setting(AppSettings::DisableColoredHelp)
+        }
+    }
+
+    /// Panic if help descriptions are omitted.
+    ///
+    /// **NOTE:** When deriving [`Parser`][crate::Parser], you could instead check this at
+    /// compile-time with `#![deny(missing_docs)]`
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .help_expected(true)
+    ///     .arg(
+    ///         Arg::new("foo").help("It does foo stuff")
+    ///         // As required via `help_expected`, a help message was supplied
+    ///      )
+    /// #    .get_matches();
+    /// ```
+    ///
+    /// # Panics
+    ///
+    /// On debug builds:
+    /// ```rust,no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myapp")
+    ///     .help_expected(true)
+    ///     .arg(
+    ///         Arg::new("foo")
+    ///         // Someone forgot to put .about("...") here
+    ///         // Since the setting `help_expected` is activated, this will lead to
+    ///         // a panic (if you are in debug mode)
+    ///     )
+    /// #   .get_matches();
+    ///```
+    #[inline]
+    pub fn help_expected(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::HelpExpected)
+        } else {
+            self.unset_global_setting(AppSettings::HelpExpected)
+        }
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "This is now the default")
+    )]
+    pub fn dont_collapse_args_in_usage(self, _yes: bool) -> Self {
+        self
+    }
+
+    /// Tells `clap` *not* to print possible values when displaying help information.
+    ///
+    /// This can be useful if there are many values, or they are explained elsewhere.
+    ///
+    /// To set this per argument, see
+    /// [`Arg::hide_possible_values`][crate::Arg::hide_possible_values].
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    #[inline]
+    pub fn hide_possible_values(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::HidePossibleValues)
+        } else {
+            self.unset_global_setting(AppSettings::HidePossibleValues)
+        }
+    }
+
+    /// Allow partial matches of long arguments or their [aliases].
+    ///
+    /// For example, to match an argument named `--test`, one could use `--t`, `--te`, `--tes`, and
+    /// `--test`.
+    ///
+    /// **NOTE:** The match *must not* be ambiguous at all in order to succeed. i.e. to match
+    /// `--te` to `--test` there could not also be another argument or alias `--temp` because both
+    /// start with `--te`
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// [aliases]: crate::Command::aliases()
+    #[inline]
+    pub fn infer_long_args(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::InferLongArgs)
+        } else {
+            self.unset_global_setting(AppSettings::InferLongArgs)
+        }
+    }
+
+    /// Allow partial matches of [subcommand] names and their [aliases].
+    ///
+    /// For example, to match a subcommand named `test`, one could use `t`, `te`, `tes`, and
+    /// `test`.
+    ///
+    /// **NOTE:** The match *must not* be ambiguous at all in order to succeed. i.e. to match `te`
+    /// to `test` there could not also be a subcommand or alias `temp` because both start with `te`
+    ///
+    /// **CAUTION:** This setting can interfere with [positional/free arguments], take care when
+    /// designing CLIs which allow inferred subcommands and have potential positional/free
+    /// arguments whose values could start with the same characters as subcommands. If this is the
+    /// case, it's recommended to use settings such as [`Command::args_conflicts_with_subcommands`] in
+    /// conjunction with this setting.
+    ///
+    /// **NOTE:** This choice is propagated to all child subcommands.
+    ///
+    /// # Examples
+    ///
+    /// ```no_run
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("prog")
+    ///     .infer_subcommands(true)
+    ///     .subcommand(Command::new("test"))
+    ///     .get_matches_from(vec![
+    ///         "prog", "te"
+    ///     ]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    ///
+    /// [subcommand]: crate::Command::subcommand()
+    /// [positional/free arguments]: crate::Arg::index()
+    /// [aliases]: crate::Command::aliases()
+    #[inline]
+    pub fn infer_subcommands(self, yes: bool) -> Self {
+        if yes {
+            self.global_setting(AppSettings::InferSubcommands)
+        } else {
+            self.unset_global_setting(AppSettings::InferSubcommands)
+        }
+    }
+}
+
+/// # Command-specific Settings
+///
+/// These apply only to the current command and are not inherited by subcommands.
+impl Command {
+    /// (Re)Sets the program's name.
+    ///
+    /// See [`Command::new`] for more details.
+    ///
+    /// # Examples
+    ///
+    /// ```ignore
+    /// let cmd = clap::command!()
+    ///     .name("foo");
+    ///
+    /// // continued logic goes here, such as `cmd.get_matches()` etc.
+    /// ```
+    #[must_use]
+    pub fn name(mut self, name: impl Into<Str>) -> Self {
+        self.name = name.into();
+        self
+    }
+
+    /// Overrides the runtime-determined name of the binary for help and error messages.
+    ///
+    /// This should only be used when absolutely necessary, such as when the binary name for your
+    /// application is misleading, or perhaps *not* how the user should invoke your program.
+    ///
+    /// **Pro-tip:** When building things such as third party `cargo`
+    /// subcommands, this setting **should** be used!
+    ///
+    /// **NOTE:** This *does not* change or set the name of the binary file on
+    /// disk. It only changes what clap thinks the name is for the purposes of
+    /// error or help messages.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("My Program")
+    ///      .bin_name("my_binary")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn bin_name(mut self, name: impl IntoResettable<String>) -> Self {
+        self.bin_name = name.into_resettable().into_option();
+        self
+    }
+
+    /// Overrides the runtime-determined display name of the program for help and error messages.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("My Program")
+    ///      .display_name("my_program")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn display_name(mut self, name: impl IntoResettable<String>) -> Self {
+        self.display_name = name.into_resettable().into_option();
+        self
+    }
+
+    /// Sets the author(s) for the help message.
+    ///
+    /// **Pro-tip:** Use `clap`s convenience macro [`crate_authors!`] to
+    /// automatically set your application's author(s) to the same thing as your
+    /// crate at compile time.
+    ///
+    /// **NOTE:** A custom [`help_template`][Command::help_template] is needed for author to show
+    /// up.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///      .author("Me, me@mymain.com")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn author(mut self, author: impl IntoResettable<Str>) -> Self {
+        self.author = author.into_resettable().into_option();
+        self
+    }
+
+    /// Sets the program's description for the short help (`-h`).
+    ///
+    /// If [`Command::long_about`] is not specified, this message will be displayed for `--help`.
+    ///
+    /// **NOTE:** Only `Command::about` (short format) is used in completion
+    /// script generation in order to be concise.
+    ///
+    /// See also [`crate_description!`](crate::crate_description!).
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .about("Does really amazing things for great people")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn about(mut self, about: impl IntoResettable<StyledStr>) -> Self {
+        self.about = about.into_resettable().into_option();
+        self
+    }
+
+    /// Sets the program's description for the long help (`--help`).
+    ///
+    /// If [`Command::about`] is not specified, this message will be displayed for `-h`.
+    ///
+    /// **NOTE:** Only [`Command::about`] (short format) is used in completion
+    /// script generation in order to be concise.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .long_about(
+    /// "Does really amazing things to great people. Now let's talk a little
+    ///  more in depth about how this subcommand really works. It may take about
+    ///  a few lines of text, but that's ok!")
+    /// # ;
+    /// ```
+    /// [`Command::about`]: Command::about()
+    #[must_use]
+    pub fn long_about(mut self, long_about: impl IntoResettable<StyledStr>) -> Self {
+        self.long_about = long_about.into_resettable().into_option();
+        self
+    }
+
+    /// Free-form help text for after auto-generated short help (`-h`).
+    ///
+    /// This is often used to describe how to use the arguments, caveats to be noted, or license
+    /// and contact information.
+    ///
+    /// If [`Command::after_long_help`] is not specified, this message will be displayed for `--help`.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .after_help("Does really amazing things for great people... but be careful with -R!")
+    /// # ;
+    /// ```
+    ///
+    #[must_use]
+    pub fn after_help(mut self, help: impl IntoResettable<StyledStr>) -> Self {
+        self.after_help = help.into_resettable().into_option();
+        self
+    }
+
+    /// Free-form help text for after auto-generated long help (`--help`).
+    ///
+    /// This is often used to describe how to use the arguments, caveats to be noted, or license
+    /// and contact information.
+    ///
+    /// If [`Command::after_help`] is not specified, this message will be displayed for `-h`.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .after_long_help("Does really amazing things to great people... but be careful with -R, \
+    ///                      like, for real, be careful with this!")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn after_long_help(mut self, help: impl IntoResettable<StyledStr>) -> Self {
+        self.after_long_help = help.into_resettable().into_option();
+        self
+    }
+
+    /// Free-form help text for before auto-generated short help (`-h`).
+    ///
+    /// This is often used for header, copyright, or license information.
+    ///
+    /// If [`Command::before_long_help`] is not specified, this message will be displayed for `--help`.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .before_help("Some info I'd like to appear before the help info")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn before_help(mut self, help: impl IntoResettable<StyledStr>) -> Self {
+        self.before_help = help.into_resettable().into_option();
+        self
+    }
+
+    /// Free-form help text for before auto-generated long help (`--help`).
+    ///
+    /// This is often used for header, copyright, or license information.
+    ///
+    /// If [`Command::before_help`] is not specified, this message will be displayed for `-h`.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .before_long_help("Some verbose and long info I'd like to appear before the help info")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn before_long_help(mut self, help: impl IntoResettable<StyledStr>) -> Self {
+        self.before_long_help = help.into_resettable().into_option();
+        self
+    }
+
+    /// Sets the version for the short version (`-V`) and help messages.
+    ///
+    /// If [`Command::long_version`] is not specified, this message will be displayed for `--version`.
+    ///
+    /// **Pro-tip:** Use `clap`s convenience macro [`crate_version!`] to
+    /// automatically set your application's version to the same thing as your
+    /// crate at compile time.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .version("v0.1.24")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn version(mut self, ver: impl IntoResettable<Str>) -> Self {
+        self.version = ver.into_resettable().into_option();
+        self
+    }
+
+    /// Sets the version for the long version (`--version`) and help messages.
+    ///
+    /// If [`Command::version`] is not specified, this message will be displayed for `-V`.
+    ///
+    /// **Pro-tip:** Use `clap`s convenience macro [`crate_version!`] to
+    /// automatically set your application's version to the same thing as your
+    /// crate at compile time.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .long_version(
+    /// "v0.1.24
+    ///  commit: abcdef89726d
+    ///  revision: 123
+    ///  release: 2
+    ///  binary: myprog")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn long_version(mut self, ver: impl IntoResettable<Str>) -> Self {
+        self.long_version = ver.into_resettable().into_option();
+        self
+    }
+
+    /// Overrides the `clap` generated usage string for help and error messages.
+    ///
+    /// **NOTE:** Using this setting disables `clap`s "context-aware" usage
+    /// strings. After this setting is set, this will be *the only* usage string
+    /// displayed to the user!
+    ///
+    /// **NOTE:** Multiple usage lines may be present in the usage argument, but
+    /// some rules need to be followed to ensure the usage lines are formatted
+    /// correctly by the default help formatter:
+    ///
+    /// - Do not indent the first usage line.
+    /// - Indent all subsequent usage lines with seven spaces.
+    /// - The last line must not end with a newline.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .override_usage("myapp [-clDas] <some_file>")
+    /// # ;
+    /// ```
+    ///
+    /// Or for multiple usage lines:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .override_usage(
+    ///         "myapp -X [-a] [-b] <file>\n       \
+    ///          myapp -Y [-c] <file1> <file2>\n       \
+    ///          myapp -Z [-d|-e]"
+    ///     )
+    /// # ;
+    /// ```
+    ///
+    /// [`ArgMatches::usage`]: ArgMatches::usage()
+    #[must_use]
+    pub fn override_usage(mut self, usage: impl IntoResettable<StyledStr>) -> Self {
+        self.usage_str = usage.into_resettable().into_option();
+        self
+    }
+
+    /// Overrides the `clap` generated help message (both `-h` and `--help`).
+    ///
+    /// This should only be used when the auto-generated message does not suffice.
+    ///
+    /// **NOTE:** This **only** replaces the help message for the current
+    /// command, meaning if you are using subcommands, those help messages will
+    /// still be auto-generated unless you specify a [`Command::override_help`] for
+    /// them as well.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myapp")
+    ///     .override_help("myapp v1.0\n\
+    ///            Does awesome things\n\
+    ///            (C) me@mail.com\n\n\
+    ///
+    ///            Usage: myapp <opts> <command>\n\n\
+    ///
+    ///            Options:\n\
+    ///            -h, --help       Display this message\n\
+    ///            -V, --version    Display version info\n\
+    ///            -s <stuff>       Do something with stuff\n\
+    ///            -v               Be verbose\n\n\
+    ///
+    ///            Commands:\n\
+    ///            help             Print this message\n\
+    ///            work             Do some work")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn override_help(mut self, help: impl IntoResettable<StyledStr>) -> Self {
+        self.help_str = help.into_resettable().into_option();
+        self
+    }
+
+    /// Sets the help template to be used, overriding the default format.
+    ///
+    /// **NOTE:** The template system is by design very simple. Therefore, the
+    /// tags have to be written in the lowercase and without spacing.
+    ///
+    /// Tags are given inside curly brackets.
+    ///
+    /// Valid tags are:
+    ///
+    ///   * `{name}`                - Display name for the (sub-)command.
+    ///   * `{bin}`                 - Binary name.(deprecated)
+    ///   * `{version}`             - Version number.
+    ///   * `{author}`              - Author information.
+    ///   * `{author-with-newline}` - Author followed by `\n`.
+    ///   * `{author-section}`      - Author preceded and followed by `\n`.
+    ///   * `{about}`               - General description (from [`Command::about`] or
+    ///                               [`Command::long_about`]).
+    ///   * `{about-with-newline}`  - About followed by `\n`.
+    ///   * `{about-section}`       - About preceded and followed by '\n'.
+    ///   * `{usage-heading}`       - Automatically generated usage heading.
+    ///   * `{usage}`               - Automatically generated or given usage string.
+    ///   * `{all-args}`            - Help for all arguments (options, flags, positional
+    ///                               arguments, and subcommands) including titles.
+    ///   * `{options}`             - Help for options.
+    ///   * `{positionals}`         - Help for positional arguments.
+    ///   * `{subcommands}`         - Help for subcommands.
+    ///   * `{tab}`                 - Standard tab sized used within clap
+    ///   * `{after-help}`          - Help from [`Command::after_help`] or [`Command::after_long_help`].
+    ///   * `{before-help}`         - Help from [`Command::before_help`] or [`Command::before_long_help`].
+    ///
+    /// # Examples
+    ///
+    /// For a very brief help:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .version("1.0")
+    ///     .help_template("{name} ({version}) - {usage}")
+    /// # ;
+    /// ```
+    ///
+    /// For showing more application context:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .version("1.0")
+    ///     .help_template("\
+    /// {before-help}{name} {version}
+    /// {author-with-newline}{about-with-newline}
+    /// {usage-heading} {usage}
+    ///
+    /// {all-args}{after-help}
+    /// ")
+    /// # ;
+    /// ```
+    /// [`Command::about`]: Command::about()
+    /// [`Command::long_about`]: Command::long_about()
+    /// [`Command::after_help`]: Command::after_help()
+    /// [`Command::after_long_help`]: Command::after_long_help()
+    /// [`Command::before_help`]: Command::before_help()
+    /// [`Command::before_long_help`]: Command::before_long_help()
+    #[must_use]
+    #[cfg(feature = "help")]
+    pub fn help_template(mut self, s: impl IntoResettable<StyledStr>) -> Self {
+        self.template = s.into_resettable().into_option();
+        self
+    }
+
+    #[inline]
+    #[must_use]
+    pub(crate) fn setting(mut self, setting: AppSettings) -> Self {
+        self.settings.set(setting);
+        self
+    }
+
+    #[inline]
+    #[must_use]
+    pub(crate) fn unset_setting(mut self, setting: AppSettings) -> Self {
+        self.settings.unset(setting);
+        self
+    }
+
+    #[inline]
+    #[must_use]
+    pub(crate) fn global_setting(mut self, setting: AppSettings) -> Self {
+        self.settings.set(setting);
+        self.g_settings.set(setting);
+        self
+    }
+
+    #[inline]
+    #[must_use]
+    pub(crate) fn unset_global_setting(mut self, setting: AppSettings) -> Self {
+        self.settings.unset(setting);
+        self.g_settings.unset(setting);
+        self
+    }
+
+    /// Flatten subcommand help into the current command's help
+    ///
+    /// This shows a summary of subcommands within the usage and help for the current command, similar to
+    /// `git stash --help` showing information on `push`, `pop`, etc.
+    /// To see more information, a user can still pass `--help` to the individual subcommands.
+    #[inline]
+    #[must_use]
+    pub fn flatten_help(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::FlattenHelp)
+        } else {
+            self.unset_setting(AppSettings::FlattenHelp)
+        }
+    }
+
+    /// Set the default section heading for future args.
+    ///
+    /// This will be used for any arg that hasn't had [`Arg::help_heading`] called.
+    ///
+    /// This is useful if the default `Options` or `Arguments` headings are
+    /// not specific enough for one's use case.
+    ///
+    /// For subcommands, see [`Command::subcommand_help_heading`]
+    ///
+    /// [`Command::arg`]: Command::arg()
+    /// [`Arg::help_heading`]: crate::Arg::help_heading()
+    #[inline]
+    #[must_use]
+    pub fn next_help_heading(mut self, heading: impl IntoResettable<Str>) -> Self {
+        self.current_help_heading = heading.into_resettable().into_option();
+        self
+    }
+
+    /// Change the starting value for assigning future display orders for args.
+    ///
+    /// This will be used for any arg that hasn't had [`Arg::display_order`] called.
+    #[inline]
+    #[must_use]
+    pub fn next_display_order(mut self, disp_ord: impl IntoResettable<usize>) -> Self {
+        self.current_disp_ord = disp_ord.into_resettable().into_option();
+        self
+    }
+
+    /// Exit gracefully if no arguments are present (e.g. `$ myprog`).
+    ///
+    /// **NOTE:** [`subcommands`] count as arguments
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command};
+    /// Command::new("myprog")
+    ///     .arg_required_else_help(true);
+    /// ```
+    ///
+    /// [`subcommands`]: crate::Command::subcommand()
+    /// [`Arg::default_value`]: crate::Arg::default_value()
+    #[inline]
+    pub fn arg_required_else_help(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::ArgRequiredElseHelp)
+        } else {
+            self.unset_setting(AppSettings::ArgRequiredElseHelp)
+        }
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::allow_hyphen_values`")
+    )]
+    pub fn allow_hyphen_values(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::AllowHyphenValues)
+        } else {
+            self.unset_setting(AppSettings::AllowHyphenValues)
+        }
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::allow_negative_numbers`")
+    )]
+    pub fn allow_negative_numbers(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::AllowNegativeNumbers)
+        } else {
+            self.unset_setting(AppSettings::AllowNegativeNumbers)
+        }
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::trailing_var_arg`")
+    )]
+    pub fn trailing_var_arg(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::TrailingVarArg)
+        } else {
+            self.unset_setting(AppSettings::TrailingVarArg)
+        }
+    }
+
+    /// Allows one to implement two styles of CLIs where positionals can be used out of order.
+    ///
+    /// The first example is a CLI where the second to last positional argument is optional, but
+    /// the final positional argument is required. Such as `$ prog [optional] <required>` where one
+    /// of the two following usages is allowed:
+    ///
+    /// * `$ prog [optional] <required>`
+    /// * `$ prog <required>`
+    ///
+    /// This would otherwise not be allowed. This is useful when `[optional]` has a default value.
+    ///
+    /// **Note:** when using this style of "missing positionals" the final positional *must* be
+    /// [required] if `--` will not be used to skip to the final positional argument.
+    ///
+    /// **Note:** This style also only allows a single positional argument to be "skipped" without
+    /// the use of `--`. To skip more than one, see the second example.
+    ///
+    /// The second example is when one wants to skip multiple optional positional arguments, and use
+    /// of the `--` operator is OK (but not required if all arguments will be specified anyways).
+    ///
+    /// For example, imagine a CLI which has three positional arguments `[foo] [bar] [baz]...` where
+    /// `baz` accepts multiple values (similar to man `ARGS...` style training arguments).
+    ///
+    /// With this setting the following invocations are posisble:
+    ///
+    /// * `$ prog foo bar baz1 baz2 baz3`
+    /// * `$ prog foo -- baz1 baz2 baz3`
+    /// * `$ prog -- baz1 baz2 baz3`
+    ///
+    /// # Examples
+    ///
+    /// Style number one from above:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// // Assume there is an external subcommand named "subcmd"
+    /// let m = Command::new("myprog")
+    ///     .allow_missing_positional(true)
+    ///     .arg(Arg::new("arg1"))
+    ///     .arg(Arg::new("arg2")
+    ///         .required(true))
+    ///     .get_matches_from(vec![
+    ///         "prog", "other"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("arg1"), None);
+    /// assert_eq!(m.get_one::<String>("arg2").unwrap(), "other");
+    /// ```
+    ///
+    /// Now the same example, but using a default value for the first optional positional argument
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// // Assume there is an external subcommand named "subcmd"
+    /// let m = Command::new("myprog")
+    ///     .allow_missing_positional(true)
+    ///     .arg(Arg::new("arg1")
+    ///         .default_value("something"))
+    ///     .arg(Arg::new("arg2")
+    ///         .required(true))
+    ///     .get_matches_from(vec![
+    ///         "prog", "other"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("arg1").unwrap(), "something");
+    /// assert_eq!(m.get_one::<String>("arg2").unwrap(), "other");
+    /// ```
+    ///
+    /// Style number two from above:
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// // Assume there is an external subcommand named "subcmd"
+    /// let m = Command::new("myprog")
+    ///     .allow_missing_positional(true)
+    ///     .arg(Arg::new("foo"))
+    ///     .arg(Arg::new("bar"))
+    ///     .arg(Arg::new("baz").action(ArgAction::Set).num_args(1..))
+    ///     .get_matches_from(vec![
+    ///         "prog", "foo", "bar", "baz1", "baz2", "baz3"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("foo").unwrap(), "foo");
+    /// assert_eq!(m.get_one::<String>("bar").unwrap(), "bar");
+    /// assert_eq!(m.get_many::<String>("baz").unwrap().collect::<Vec<_>>(), &["baz1", "baz2", "baz3"]);
+    /// ```
+    ///
+    /// Now nofice if we don't specify `foo` or `baz` but use the `--` operator.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// // Assume there is an external subcommand named "subcmd"
+    /// let m = Command::new("myprog")
+    ///     .allow_missing_positional(true)
+    ///     .arg(Arg::new("foo"))
+    ///     .arg(Arg::new("bar"))
+    ///     .arg(Arg::new("baz").action(ArgAction::Set).num_args(1..))
+    ///     .get_matches_from(vec![
+    ///         "prog", "--", "baz1", "baz2", "baz3"
+    ///     ]);
+    ///
+    /// assert_eq!(m.get_one::<String>("foo"), None);
+    /// assert_eq!(m.get_one::<String>("bar"), None);
+    /// assert_eq!(m.get_many::<String>("baz").unwrap().collect::<Vec<_>>(), &["baz1", "baz2", "baz3"]);
+    /// ```
+    ///
+    /// [required]: crate::Arg::required()
+    #[inline]
+    pub fn allow_missing_positional(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::AllowMissingPositional)
+        } else {
+            self.unset_setting(AppSettings::AllowMissingPositional)
+        }
+    }
+}
+
+/// # Subcommand-specific Settings
+impl Command {
+    /// Sets the short version of the subcommand flag without the preceding `-`.
+    ///
+    /// Allows the subcommand to be used as if it were an [`Arg::short`].
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let matches = Command::new("pacman")
+    ///     .subcommand(
+    ///         Command::new("sync").short_flag('S').arg(
+    ///             Arg::new("search")
+    ///                 .short('s')
+    ///                 .long("search")
+    ///                 .action(ArgAction::SetTrue)
+    ///                 .help("search remote repositories for matching strings"),
+    ///         ),
+    ///     )
+    ///     .get_matches_from(vec!["pacman", "-Ss"]);
+    ///
+    /// assert_eq!(matches.subcommand_name().unwrap(), "sync");
+    /// let sync_matches = matches.subcommand_matches("sync").unwrap();
+    /// assert!(sync_matches.get_flag("search"));
+    /// ```
+    /// [`Arg::short`]: Arg::short()
+    #[must_use]
+    pub fn short_flag(mut self, short: impl IntoResettable<char>) -> Self {
+        self.short_flag = short.into_resettable().into_option();
+        self
+    }
+
+    /// Sets the long version of the subcommand flag without the preceding `--`.
+    ///
+    /// Allows the subcommand to be used as if it were an [`Arg::long`].
+    ///
+    /// **NOTE:** Any leading `-` characters will be stripped.
+    ///
+    /// # Examples
+    ///
+    /// To set `long_flag` use a word containing valid UTF-8 codepoints. If you supply a double leading
+    /// `--` such as `--sync` they will be stripped. Hyphens in the middle of the word; however,
+    /// will *not* be stripped (i.e. `sync-file` is allowed).
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let matches = Command::new("pacman")
+    ///     .subcommand(
+    ///         Command::new("sync").long_flag("sync").arg(
+    ///             Arg::new("search")
+    ///                 .short('s')
+    ///                 .long("search")
+    ///                 .action(ArgAction::SetTrue)
+    ///                 .help("search remote repositories for matching strings"),
+    ///         ),
+    ///     )
+    ///     .get_matches_from(vec!["pacman", "--sync", "--search"]);
+    ///
+    /// assert_eq!(matches.subcommand_name().unwrap(), "sync");
+    /// let sync_matches = matches.subcommand_matches("sync").unwrap();
+    /// assert!(sync_matches.get_flag("search"));
+    /// ```
+    ///
+    /// [`Arg::long`]: Arg::long()
+    #[must_use]
+    pub fn long_flag(mut self, long: impl Into<Str>) -> Self {
+        self.long_flag = Some(long.into());
+        self
+    }
+
+    /// Sets a hidden alias to this subcommand.
+    ///
+    /// This allows the subcommand to be accessed via *either* the original name, or this given
+    /// alias. This is more efficient and easier than creating multiple hidden subcommands as one
+    /// only needs to check for the existence of this command, and not all aliased variants.
+    ///
+    /// **NOTE:** Aliases defined with this method are *hidden* from the help
+    /// message. If you're looking for aliases that will be displayed in the help
+    /// message, see [`Command::visible_alias`].
+    ///
+    /// **NOTE:** When using aliases and checking for the existence of a
+    /// particular subcommand within an [`ArgMatches`] struct, one only needs to
+    /// search for the original name and not all aliases.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// let m = Command::new("myprog")
+    ///     .subcommand(Command::new("test")
+    ///         .alias("do-stuff"))
+    ///     .get_matches_from(vec!["myprog", "do-stuff"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    /// [`Command::visible_alias`]: Command::visible_alias()
+    #[must_use]
+    pub fn alias(mut self, name: impl IntoResettable<Str>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            self.aliases.push((name, false));
+        } else {
+            self.aliases.clear();
+        }
+        self
+    }
+
+    /// Add an alias, which functions as  "hidden" short flag subcommand
+    ///
+    /// This will automatically dispatch as if this subcommand was used. This is more efficient,
+    /// and easier than creating multiple hidden subcommands as one only needs to check for the
+    /// existence of this command, and not all variants.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// let m = Command::new("myprog")
+    ///             .subcommand(Command::new("test").short_flag('t')
+    ///                 .short_flag_alias('d'))
+    ///             .get_matches_from(vec!["myprog", "-d"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    #[must_use]
+    pub fn short_flag_alias(mut self, name: impl IntoResettable<char>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            debug_assert!(name != '-', "short alias name cannot be `-`");
+            self.short_flag_aliases.push((name, false));
+        } else {
+            self.short_flag_aliases.clear();
+        }
+        self
+    }
+
+    /// Add an alias, which functions as a "hidden" long flag subcommand.
+    ///
+    /// This will automatically dispatch as if this subcommand was used. This is more efficient,
+    /// and easier than creating multiple hidden subcommands as one only needs to check for the
+    /// existence of this command, and not all variants.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// let m = Command::new("myprog")
+    ///             .subcommand(Command::new("test").long_flag("test")
+    ///                 .long_flag_alias("testing"))
+    ///             .get_matches_from(vec!["myprog", "--testing"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    #[must_use]
+    pub fn long_flag_alias(mut self, name: impl IntoResettable<Str>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            self.long_flag_aliases.push((name, false));
+        } else {
+            self.long_flag_aliases.clear();
+        }
+        self
+    }
+
+    /// Sets multiple hidden aliases to this subcommand.
+    ///
+    /// This allows the subcommand to be accessed via *either* the original name or any of the
+    /// given aliases. This is more efficient, and easier than creating multiple hidden subcommands
+    /// as one only needs to check for the existence of this command and not all aliased variants.
+    ///
+    /// **NOTE:** Aliases defined with this method are *hidden* from the help
+    /// message. If looking for aliases that will be displayed in the help
+    /// message, see [`Command::visible_aliases`].
+    ///
+    /// **NOTE:** When using aliases and checking for the existence of a
+    /// particular subcommand within an [`ArgMatches`] struct, one only needs to
+    /// search for the original name and not all aliases.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("myprog")
+    ///     .subcommand(Command::new("test")
+    ///         .aliases(["do-stuff", "do-tests", "tests"]))
+    ///         .arg(Arg::new("input")
+    ///             .help("the file to add")
+    ///             .required(false))
+    ///     .get_matches_from(vec!["myprog", "do-tests"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    /// [`Command::visible_aliases`]: Command::visible_aliases()
+    #[must_use]
+    pub fn aliases(mut self, names: impl IntoIterator<Item = impl Into<Str>>) -> Self {
+        self.aliases
+            .extend(names.into_iter().map(|n| (n.into(), false)));
+        self
+    }
+
+    /// Add aliases, which function as "hidden" short flag subcommands.
+    ///
+    /// These will automatically dispatch as if this subcommand was used. This is more efficient,
+    /// and easier than creating multiple hidden subcommands as one only needs to check for the
+    /// existence of this command, and not all variants.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// let m = Command::new("myprog")
+    ///     .subcommand(Command::new("test").short_flag('t')
+    ///         .short_flag_aliases(['a', 'b', 'c']))
+    ///         .arg(Arg::new("input")
+    ///             .help("the file to add")
+    ///             .required(false))
+    ///     .get_matches_from(vec!["myprog", "-a"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    #[must_use]
+    pub fn short_flag_aliases(mut self, names: impl IntoIterator<Item = char>) -> Self {
+        for s in names {
+            debug_assert!(s != '-', "short alias name cannot be `-`");
+            self.short_flag_aliases.push((s, false));
+        }
+        self
+    }
+
+    /// Add aliases, which function as "hidden" long flag subcommands.
+    ///
+    /// These will automatically dispatch as if this subcommand was used. This is more efficient,
+    /// and easier than creating multiple hidden subcommands as one only needs to check for the
+    /// existence of this command, and not all variants.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// let m = Command::new("myprog")
+    ///             .subcommand(Command::new("test").long_flag("test")
+    ///                 .long_flag_aliases(["testing", "testall", "test_all"]))
+    ///                 .arg(Arg::new("input")
+    ///                             .help("the file to add")
+    ///                             .required(false))
+    ///             .get_matches_from(vec!["myprog", "--testing"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    #[must_use]
+    pub fn long_flag_aliases(mut self, names: impl IntoIterator<Item = impl Into<Str>>) -> Self {
+        for s in names {
+            self = self.long_flag_alias(s)
+        }
+        self
+    }
+
+    /// Sets a visible alias to this subcommand.
+    ///
+    /// This allows the subcommand to be accessed via *either* the
+    /// original name or the given alias. This is more efficient and easier
+    /// than creating hidden subcommands as one only needs to check for
+    /// the existence of this command and not all aliased variants.
+    ///
+    /// **NOTE:** The alias defined with this method is *visible* from the help
+    /// message and displayed as if it were just another regular subcommand. If
+    /// looking for an alias that will not be displayed in the help message, see
+    /// [`Command::alias`].
+    ///
+    /// **NOTE:** When using aliases and checking for the existence of a
+    /// particular subcommand within an [`ArgMatches`] struct, one only needs to
+    /// search for the original name and not all aliases.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// let m = Command::new("myprog")
+    ///     .subcommand(Command::new("test")
+    ///         .visible_alias("do-stuff"))
+    ///     .get_matches_from(vec!["myprog", "do-stuff"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    /// [`Command::alias`]: Command::alias()
+    #[must_use]
+    pub fn visible_alias(mut self, name: impl IntoResettable<Str>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            self.aliases.push((name, true));
+        } else {
+            self.aliases.clear();
+        }
+        self
+    }
+
+    /// Add an alias, which functions as  "visible" short flag subcommand
+    ///
+    /// This will automatically dispatch as if this subcommand was used. This is more efficient,
+    /// and easier than creating multiple hidden subcommands as one only needs to check for the
+    /// existence of this command, and not all variants.
+    ///
+    /// See also [`Command::short_flag_alias`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// let m = Command::new("myprog")
+    ///             .subcommand(Command::new("test").short_flag('t')
+    ///                 .visible_short_flag_alias('d'))
+    ///             .get_matches_from(vec!["myprog", "-d"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    /// [`Command::short_flag_alias`]: Command::short_flag_alias()
+    #[must_use]
+    pub fn visible_short_flag_alias(mut self, name: impl IntoResettable<char>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            debug_assert!(name != '-', "short alias name cannot be `-`");
+            self.short_flag_aliases.push((name, true));
+        } else {
+            self.short_flag_aliases.clear();
+        }
+        self
+    }
+
+    /// Add an alias, which functions as a "visible" long flag subcommand.
+    ///
+    /// This will automatically dispatch as if this subcommand was used. This is more efficient,
+    /// and easier than creating multiple hidden subcommands as one only needs to check for the
+    /// existence of this command, and not all variants.
+    ///
+    /// See also [`Command::long_flag_alias`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// let m = Command::new("myprog")
+    ///             .subcommand(Command::new("test").long_flag("test")
+    ///                 .visible_long_flag_alias("testing"))
+    ///             .get_matches_from(vec!["myprog", "--testing"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    /// [`Command::long_flag_alias`]: Command::long_flag_alias()
+    #[must_use]
+    pub fn visible_long_flag_alias(mut self, name: impl IntoResettable<Str>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            self.long_flag_aliases.push((name, true));
+        } else {
+            self.long_flag_aliases.clear();
+        }
+        self
+    }
+
+    /// Sets multiple visible aliases to this subcommand.
+    ///
+    /// This allows the subcommand to be accessed via *either* the
+    /// original name or any of the given aliases. This is more efficient and easier
+    /// than creating multiple hidden subcommands as one only needs to check for
+    /// the existence of this command and not all aliased variants.
+    ///
+    /// **NOTE:** The alias defined with this method is *visible* from the help
+    /// message and displayed as if it were just another regular subcommand. If
+    /// looking for an alias that will not be displayed in the help message, see
+    /// [`Command::alias`].
+    ///
+    /// **NOTE:** When using aliases, and checking for the existence of a
+    /// particular subcommand within an [`ArgMatches`] struct, one only needs to
+    /// search for the original name and not all aliases.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// let m = Command::new("myprog")
+    ///     .subcommand(Command::new("test")
+    ///         .visible_aliases(["do-stuff", "tests"]))
+    ///     .get_matches_from(vec!["myprog", "do-stuff"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    /// [`Command::alias`]: Command::alias()
+    #[must_use]
+    pub fn visible_aliases(mut self, names: impl IntoIterator<Item = impl Into<Str>>) -> Self {
+        self.aliases
+            .extend(names.into_iter().map(|n| (n.into(), true)));
+        self
+    }
+
+    /// Add aliases, which function as *visible* short flag subcommands.
+    ///
+    /// See [`Command::short_flag_aliases`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// let m = Command::new("myprog")
+    ///             .subcommand(Command::new("test").short_flag('b')
+    ///                 .visible_short_flag_aliases(['t']))
+    ///             .get_matches_from(vec!["myprog", "-t"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    /// [`Command::short_flag_aliases`]: Command::short_flag_aliases()
+    #[must_use]
+    pub fn visible_short_flag_aliases(mut self, names: impl IntoIterator<Item = char>) -> Self {
+        for s in names {
+            debug_assert!(s != '-', "short alias name cannot be `-`");
+            self.short_flag_aliases.push((s, true));
+        }
+        self
+    }
+
+    /// Add aliases, which function as *visible* long flag subcommands.
+    ///
+    /// See [`Command::long_flag_aliases`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, };
+    /// let m = Command::new("myprog")
+    ///             .subcommand(Command::new("test").long_flag("test")
+    ///                 .visible_long_flag_aliases(["testing", "testall", "test_all"]))
+    ///             .get_matches_from(vec!["myprog", "--testing"]);
+    /// assert_eq!(m.subcommand_name(), Some("test"));
+    /// ```
+    /// [`Command::long_flag_aliases`]: Command::long_flag_aliases()
+    #[must_use]
+    pub fn visible_long_flag_aliases(
+        mut self,
+        names: impl IntoIterator<Item = impl Into<Str>>,
+    ) -> Self {
+        for s in names {
+            self = self.visible_long_flag_alias(s);
+        }
+        self
+    }
+
+    /// Set the placement of this subcommand within the help.
+    ///
+    /// Subcommands with a lower value will be displayed first in the help message.
+    /// Those with the same display order will be sorted.
+    ///
+    /// `Command`s are automatically assigned a display order based on the order they are added to
+    /// their parent [`Command`].
+    /// Overriding this is helpful when the order commands are added in isn't the same as the
+    /// display order, whether in one-off cases or to automatically sort commands.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # #[cfg(feature = "help")] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, };
+    /// let m = Command::new("cust-ord")
+    ///     .subcommand(Command::new("beta")
+    ///         .display_order(0)  // Sort
+    ///         .about("Some help and text"))
+    ///     .subcommand(Command::new("alpha")
+    ///         .display_order(0)  // Sort
+    ///         .about("I should be first!"))
+    ///     .get_matches_from(vec![
+    ///         "cust-ord", "--help"
+    ///     ]);
+    /// # }
+    /// ```
+    ///
+    /// The above example displays the following help message
+    ///
+    /// ```text
+    /// cust-ord
+    ///
+    /// Usage: cust-ord [OPTIONS]
+    ///
+    /// Commands:
+    ///     alpha    I should be first!
+    ///     beta     Some help and text
+    ///     help     Print help for the subcommand(s)
+    ///
+    /// Options:
+    ///     -h, --help       Print help
+    ///     -V, --version    Print version
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn display_order(mut self, ord: impl IntoResettable<usize>) -> Self {
+        self.disp_ord = ord.into_resettable().into_option();
+        self
+    }
+
+    /// Specifies that this [`subcommand`] should be hidden from help messages
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .subcommand(
+    ///         Command::new("test").hide(true)
+    ///     )
+    /// # ;
+    /// ```
+    ///
+    /// [`subcommand`]: crate::Command::subcommand()
+    #[inline]
+    pub fn hide(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::Hidden)
+        } else {
+            self.unset_setting(AppSettings::Hidden)
+        }
+    }
+
+    /// If no [`subcommand`] is present at runtime, error and exit gracefully.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, error::ErrorKind};
+    /// let err = Command::new("myprog")
+    ///     .subcommand_required(true)
+    ///     .subcommand(Command::new("test"))
+    ///     .try_get_matches_from(vec![
+    ///         "myprog",
+    ///     ]);
+    /// assert!(err.is_err());
+    /// assert_eq!(err.unwrap_err().kind(), ErrorKind::MissingSubcommand);
+    /// # ;
+    /// ```
+    ///
+    /// [`subcommand`]: crate::Command::subcommand()
+    pub fn subcommand_required(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::SubcommandRequired)
+        } else {
+            self.unset_setting(AppSettings::SubcommandRequired)
+        }
+    }
+
+    /// Assume unexpected positional arguments are a [`subcommand`].
+    ///
+    /// Arguments will be stored in the `""` argument in the [`ArgMatches`]
+    ///
+    /// **NOTE:** Use this setting with caution,
+    /// as a truly unexpected argument (i.e. one that is *NOT* an external subcommand)
+    /// will **not** cause an error and instead be treated as a potential subcommand.
+    /// One should check for such cases manually and inform the user appropriately.
+    ///
+    /// **NOTE:** A built-in subcommand will be parsed as an external subcommand when escaped with
+    /// `--`.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use std::ffi::OsString;
+    /// # use clap::Command;
+    /// // Assume there is an external subcommand named "subcmd"
+    /// let m = Command::new("myprog")
+    ///     .allow_external_subcommands(true)
+    ///     .get_matches_from(vec![
+    ///         "myprog", "subcmd", "--option", "value", "-fff", "--flag"
+    ///     ]);
+    ///
+    /// // All trailing arguments will be stored under the subcommand's sub-matches using an empty
+    /// // string argument name
+    /// match m.subcommand() {
+    ///     Some((external, ext_m)) => {
+    ///          let ext_args: Vec<_> = ext_m.get_many::<OsString>("").unwrap().collect();
+    ///          assert_eq!(external, "subcmd");
+    ///          assert_eq!(ext_args, ["--option", "value", "-fff", "--flag"]);
+    ///     },
+    ///     _ => {},
+    /// }
+    /// ```
+    ///
+    /// [`subcommand`]: crate::Command::subcommand()
+    /// [`ArgMatches`]: crate::ArgMatches
+    /// [`ErrorKind::UnknownArgument`]: crate::error::ErrorKind::UnknownArgument
+    pub fn allow_external_subcommands(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::AllowExternalSubcommands)
+        } else {
+            self.unset_setting(AppSettings::AllowExternalSubcommands)
+        }
+    }
+
+    /// Specifies how to parse external subcommand arguments.
+    ///
+    /// The default parser is for `OsString`.  This can be used to switch it to `String` or another
+    /// type.
+    ///
+    /// **NOTE:** Setting this requires [`Command::allow_external_subcommands`]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # #[cfg(unix)] {
+    /// # use clap_builder as clap;
+    /// # use std::ffi::OsString;
+    /// # use clap::Command;
+    /// # use clap::value_parser;
+    /// // Assume there is an external subcommand named "subcmd"
+    /// let m = Command::new("myprog")
+    ///     .allow_external_subcommands(true)
+    ///     .get_matches_from(vec![
+    ///         "myprog", "subcmd", "--option", "value", "-fff", "--flag"
+    ///     ]);
+    ///
+    /// // All trailing arguments will be stored under the subcommand's sub-matches using an empty
+    /// // string argument name
+    /// match m.subcommand() {
+    ///     Some((external, ext_m)) => {
+    ///          let ext_args: Vec<_> = ext_m.get_many::<OsString>("").unwrap().collect();
+    ///          assert_eq!(external, "subcmd");
+    ///          assert_eq!(ext_args, ["--option", "value", "-fff", "--flag"]);
+    ///     },
+    ///     _ => {},
+    /// }
+    /// # }
+    /// ```
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::value_parser;
+    /// // Assume there is an external subcommand named "subcmd"
+    /// let m = Command::new("myprog")
+    ///     .external_subcommand_value_parser(value_parser!(String))
+    ///     .get_matches_from(vec![
+    ///         "myprog", "subcmd", "--option", "value", "-fff", "--flag"
+    ///     ]);
+    ///
+    /// // All trailing arguments will be stored under the subcommand's sub-matches using an empty
+    /// // string argument name
+    /// match m.subcommand() {
+    ///     Some((external, ext_m)) => {
+    ///          let ext_args: Vec<_> = ext_m.get_many::<String>("").unwrap().collect();
+    ///          assert_eq!(external, "subcmd");
+    ///          assert_eq!(ext_args, ["--option", "value", "-fff", "--flag"]);
+    ///     },
+    ///     _ => {},
+    /// }
+    /// ```
+    ///
+    /// [`subcommands`]: crate::Command::subcommand()
+    pub fn external_subcommand_value_parser(
+        mut self,
+        parser: impl IntoResettable<super::ValueParser>,
+    ) -> Self {
+        self.external_value_parser = parser.into_resettable().into_option();
+        self
+    }
+
+    /// Specifies that use of an argument prevents the use of [`subcommands`].
+    ///
+    /// By default `clap` allows arguments between subcommands such
+    /// as `<cmd> [cmd_args] <subcmd> [subcmd_args] <subsubcmd> [subsubcmd_args]`.
+    ///
+    /// This setting disables that functionality and says that arguments can
+    /// only follow the *final* subcommand. For instance using this setting
+    /// makes only the following invocations possible:
+    ///
+    /// * `<cmd> <subcmd> <subsubcmd> [subsubcmd_args]`
+    /// * `<cmd> <subcmd> [subcmd_args]`
+    /// * `<cmd> [cmd_args]`
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// Command::new("myprog")
+    ///     .args_conflicts_with_subcommands(true);
+    /// ```
+    ///
+    /// [`subcommands`]: crate::Command::subcommand()
+    pub fn args_conflicts_with_subcommands(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::ArgsNegateSubcommands)
+        } else {
+            self.unset_setting(AppSettings::ArgsNegateSubcommands)
+        }
+    }
+
+    /// Prevent subcommands from being consumed as an arguments value.
+    ///
+    /// By default, if an option taking multiple values is followed by a subcommand, the
+    /// subcommand will be parsed as another value.
+    ///
+    /// ```text
+    /// cmd --foo val1 val2 subcommand
+    ///           --------- ----------
+    ///             values   another value
+    /// ```
+    ///
+    /// This setting instructs the parser to stop when encountering a subcommand instead of
+    /// greedily consuming arguments.
+    ///
+    /// ```text
+    /// cmd --foo val1 val2 subcommand
+    ///           --------- ----------
+    ///             values   subcommand
+    /// ```
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, ArgAction};
+    /// let cmd = Command::new("cmd").subcommand(Command::new("sub")).arg(
+    ///     Arg::new("arg")
+    ///         .long("arg")
+    ///         .num_args(1..)
+    ///         .action(ArgAction::Set),
+    /// );
+    ///
+    /// let matches = cmd
+    ///     .clone()
+    ///     .try_get_matches_from(&["cmd", "--arg", "1", "2", "3", "sub"])
+    ///     .unwrap();
+    /// assert_eq!(
+    ///     matches.get_many::<String>("arg").unwrap().collect::<Vec<_>>(),
+    ///     &["1", "2", "3", "sub"]
+    /// );
+    /// assert!(matches.subcommand_matches("sub").is_none());
+    ///
+    /// let matches = cmd
+    ///     .subcommand_precedence_over_arg(true)
+    ///     .try_get_matches_from(&["cmd", "--arg", "1", "2", "3", "sub"])
+    ///     .unwrap();
+    /// assert_eq!(
+    ///     matches.get_many::<String>("arg").unwrap().collect::<Vec<_>>(),
+    ///     &["1", "2", "3"]
+    /// );
+    /// assert!(matches.subcommand_matches("sub").is_some());
+    /// ```
+    pub fn subcommand_precedence_over_arg(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::SubcommandPrecedenceOverArg)
+        } else {
+            self.unset_setting(AppSettings::SubcommandPrecedenceOverArg)
+        }
+    }
+
+    /// Allows [`subcommands`] to override all requirements of the parent command.
+    ///
+    /// For example, if you had a subcommand or top level application with a required argument
+    /// that is only required as long as there is no subcommand present,
+    /// using this setting would allow you to set those arguments to [`Arg::required(true)`]
+    /// and yet receive no error so long as the user uses a valid subcommand instead.
+    ///
+    /// **NOTE:** This defaults to false (using subcommand does *not* negate requirements)
+    ///
+    /// # Examples
+    ///
+    /// This first example shows that it is an error to not use a required argument
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind};
+    /// let err = Command::new("myprog")
+    ///     .subcommand_negates_reqs(true)
+    ///     .arg(Arg::new("opt").required(true))
+    ///     .subcommand(Command::new("test"))
+    ///     .try_get_matches_from(vec![
+    ///         "myprog"
+    ///     ]);
+    /// assert!(err.is_err());
+    /// assert_eq!(err.unwrap_err().kind(), ErrorKind::MissingRequiredArgument);
+    /// # ;
+    /// ```
+    ///
+    /// This next example shows that it is no longer error to not use a required argument if a
+    /// valid subcommand is used.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, error::ErrorKind};
+    /// let noerr = Command::new("myprog")
+    ///     .subcommand_negates_reqs(true)
+    ///     .arg(Arg::new("opt").required(true))
+    ///     .subcommand(Command::new("test"))
+    ///     .try_get_matches_from(vec![
+    ///         "myprog", "test"
+    ///     ]);
+    /// assert!(noerr.is_ok());
+    /// # ;
+    /// ```
+    ///
+    /// [`Arg::required(true)`]: crate::Arg::required()
+    /// [`subcommands`]: crate::Command::subcommand()
+    pub fn subcommand_negates_reqs(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::SubcommandsNegateReqs)
+        } else {
+            self.unset_setting(AppSettings::SubcommandsNegateReqs)
+        }
+    }
+
+    /// Multiple-personality program dispatched on the binary name (`argv[0]`)
+    ///
+    /// A "multicall" executable is a single executable
+    /// that contains a variety of applets,
+    /// and decides which applet to run based on the name of the file.
+    /// The executable can be called from different names by creating hard links
+    /// or symbolic links to it.
+    ///
+    /// This is desirable for:
+    /// - Easy distribution, a single binary that can install hardlinks to access the different
+    ///   personalities.
+    /// - Minimal binary size by sharing common code (e.g. standard library, clap)
+    /// - Custom shells or REPLs where there isn't a single top-level command
+    ///
+    /// Setting `multicall` will cause
+    /// - `argv[0]` to be stripped to the base name and parsed as the first argument, as if
+    ///   [`Command::no_binary_name`][Command::no_binary_name] was set.
+    /// - Help and errors to report subcommands as if they were the top-level command
+    ///
+    /// When the subcommand is not present, there are several strategies you may employ, depending
+    /// on your needs:
+    /// - Let the error percolate up normally
+    /// - Print a specialized error message using the
+    ///   [`Error::context`][crate::Error::context]
+    /// - Print the [help][Command::write_help] but this might be ambiguous
+    /// - Disable `multicall` and re-parse it
+    /// - Disable `multicall` and re-parse it with a specific subcommand
+    ///
+    /// When detecting the error condition, the [`ErrorKind`] isn't sufficient as a sub-subcommand
+    /// might report the same error.  Enable
+    /// [`allow_external_subcommands`][Command::allow_external_subcommands] if you want to specifically
+    /// get the unrecognized binary name.
+    ///
+    /// **NOTE:** Multicall can't be used with [`no_binary_name`] since they interpret
+    /// the command name in incompatible ways.
+    ///
+    /// **NOTE:** The multicall command cannot have arguments.
+    ///
+    /// **NOTE:** Applets are slightly semantically different from subcommands,
+    /// so it's recommended to use [`Command::subcommand_help_heading`] and
+    /// [`Command::subcommand_value_name`] to change the descriptive text as above.
+    ///
+    /// # Examples
+    ///
+    /// `hostname` is an example of a multicall executable.
+    /// Both `hostname` and `dnsdomainname` are provided by the same executable
+    /// and which behaviour to use is based on the executable file name.
+    ///
+    /// This is desirable when the executable has a primary purpose
+    /// but there is related functionality that would be convenient to provide
+    /// and implement it to be in the same executable.
+    ///
+    /// The name of the cmd is essentially unused
+    /// and may be the same as the name of a subcommand.
+    ///
+    /// The names of the immediate subcommands of the Command
+    /// are matched against the basename of the first argument,
+    /// which is conventionally the path of the executable.
+    ///
+    /// This does not allow the subcommand to be passed as the first non-path argument.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, error::ErrorKind};
+    /// let mut cmd = Command::new("hostname")
+    ///     .multicall(true)
+    ///     .subcommand(Command::new("hostname"))
+    ///     .subcommand(Command::new("dnsdomainname"));
+    /// let m = cmd.try_get_matches_from_mut(&["/usr/bin/hostname", "dnsdomainname"]);
+    /// assert!(m.is_err());
+    /// assert_eq!(m.unwrap_err().kind(), ErrorKind::UnknownArgument);
+    /// let m = cmd.get_matches_from(&["/usr/bin/dnsdomainname"]);
+    /// assert_eq!(m.subcommand_name(), Some("dnsdomainname"));
+    /// ```
+    ///
+    /// Busybox is another common example of a multicall executable
+    /// with a subcommmand for each applet that can be run directly,
+    /// e.g. with the `cat` applet being run by running `busybox cat`,
+    /// or with `cat` as a link to the `busybox` binary.
+    ///
+    /// This is desirable when the launcher program has additional options
+    /// or it is useful to run the applet without installing a symlink
+    /// e.g. to test the applet without installing it
+    /// or there may already be a command of that name installed.
+    ///
+    /// To make an applet usable as both a multicall link and a subcommand
+    /// the subcommands must be defined both in the top-level Command
+    /// and as subcommands of the "main" applet.
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// fn applet_commands() -> [Command; 2] {
+    ///     [Command::new("true"), Command::new("false")]
+    /// }
+    /// let mut cmd = Command::new("busybox")
+    ///     .multicall(true)
+    ///     .subcommand(
+    ///         Command::new("busybox")
+    ///             .subcommand_value_name("APPLET")
+    ///             .subcommand_help_heading("APPLETS")
+    ///             .subcommands(applet_commands()),
+    ///     )
+    ///     .subcommands(applet_commands());
+    /// // When called from the executable's canonical name
+    /// // its applets can be matched as subcommands.
+    /// let m = cmd.try_get_matches_from_mut(&["/usr/bin/busybox", "true"]).unwrap();
+    /// assert_eq!(m.subcommand_name(), Some("busybox"));
+    /// assert_eq!(m.subcommand().unwrap().1.subcommand_name(), Some("true"));
+    /// // When called from a link named after an applet that applet is matched.
+    /// let m = cmd.get_matches_from(&["/usr/bin/true"]);
+    /// assert_eq!(m.subcommand_name(), Some("true"));
+    /// ```
+    ///
+    /// [`no_binary_name`]: crate::Command::no_binary_name
+    /// [`Command::subcommand_value_name`]: crate::Command::subcommand_value_name
+    /// [`Command::subcommand_help_heading`]: crate::Command::subcommand_help_heading
+    #[inline]
+    pub fn multicall(self, yes: bool) -> Self {
+        if yes {
+            self.setting(AppSettings::Multicall)
+        } else {
+            self.unset_setting(AppSettings::Multicall)
+        }
+    }
+
+    /// Sets the value name used for subcommands when printing usage and help.
+    ///
+    /// By default, this is "COMMAND".
+    ///
+    /// See also [`Command::subcommand_help_heading`]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .subcommand(Command::new("sub1"))
+    ///     .print_help()
+    /// # ;
+    /// ```
+    ///
+    /// will produce
+    ///
+    /// ```text
+    /// myprog
+    ///
+    /// Usage: myprog [COMMAND]
+    ///
+    /// Commands:
+    ///     help    Print this message or the help of the given subcommand(s)
+    ///     sub1
+    ///
+    /// Options:
+    ///     -h, --help       Print help
+    ///     -V, --version    Print version
+    /// ```
+    ///
+    /// but usage of `subcommand_value_name`
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .subcommand(Command::new("sub1"))
+    ///     .subcommand_value_name("THING")
+    ///     .print_help()
+    /// # ;
+    /// ```
+    ///
+    /// will produce
+    ///
+    /// ```text
+    /// myprog
+    ///
+    /// Usage: myprog [THING]
+    ///
+    /// Commands:
+    ///     help    Print this message or the help of the given subcommand(s)
+    ///     sub1
+    ///
+    /// Options:
+    ///     -h, --help       Print help
+    ///     -V, --version    Print version
+    /// ```
+    #[must_use]
+    pub fn subcommand_value_name(mut self, value_name: impl IntoResettable<Str>) -> Self {
+        self.subcommand_value_name = value_name.into_resettable().into_option();
+        self
+    }
+
+    /// Sets the help heading used for subcommands when printing usage and help.
+    ///
+    /// By default, this is "Commands".
+    ///
+    /// See also [`Command::subcommand_value_name`]
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .subcommand(Command::new("sub1"))
+    ///     .print_help()
+    /// # ;
+    /// ```
+    ///
+    /// will produce
+    ///
+    /// ```text
+    /// myprog
+    ///
+    /// Usage: myprog [COMMAND]
+    ///
+    /// Commands:
+    ///     help    Print this message or the help of the given subcommand(s)
+    ///     sub1
+    ///
+    /// Options:
+    ///     -h, --help       Print help
+    ///     -V, --version    Print version
+    /// ```
+    ///
+    /// but usage of `subcommand_help_heading`
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg};
+    /// Command::new("myprog")
+    ///     .subcommand(Command::new("sub1"))
+    ///     .subcommand_help_heading("Things")
+    ///     .print_help()
+    /// # ;
+    /// ```
+    ///
+    /// will produce
+    ///
+    /// ```text
+    /// myprog
+    ///
+    /// Usage: myprog [COMMAND]
+    ///
+    /// Things:
+    ///     help    Print this message or the help of the given subcommand(s)
+    ///     sub1
+    ///
+    /// Options:
+    ///     -h, --help       Print help
+    ///     -V, --version    Print version
+    /// ```
+    #[must_use]
+    pub fn subcommand_help_heading(mut self, heading: impl IntoResettable<Str>) -> Self {
+        self.subcommand_heading = heading.into_resettable().into_option();
+        self
+    }
+}
+
+/// # Reflection
+impl Command {
+    #[inline]
+    #[cfg(feature = "usage")]
+    pub(crate) fn get_usage_name(&self) -> Option<&str> {
+        self.usage_name.as_deref()
+    }
+
+    #[inline]
+    #[cfg(feature = "usage")]
+    pub(crate) fn get_usage_name_fallback(&self) -> &str {
+        self.get_usage_name()
+            .unwrap_or_else(|| self.get_bin_name_fallback())
+    }
+
+    #[inline]
+    #[cfg(not(feature = "usage"))]
+    #[allow(dead_code)]
+    pub(crate) fn get_usage_name_fallback(&self) -> &str {
+        self.get_bin_name_fallback()
+    }
+
+    /// Get the name of the binary.
+    #[inline]
+    pub fn get_display_name(&self) -> Option<&str> {
+        self.display_name.as_deref()
+    }
+
+    /// Get the name of the binary.
+    #[inline]
+    pub fn get_bin_name(&self) -> Option<&str> {
+        self.bin_name.as_deref()
+    }
+
+    /// Get the name of the binary.
+    #[inline]
+    pub(crate) fn get_bin_name_fallback(&self) -> &str {
+        self.bin_name.as_deref().unwrap_or_else(|| self.get_name())
+    }
+
+    /// Set binary name. Uses `&mut self` instead of `self`.
+    pub fn set_bin_name(&mut self, name: impl Into<String>) {
+        self.bin_name = Some(name.into());
+    }
+
+    /// Get the name of the cmd.
+    #[inline]
+    pub fn get_name(&self) -> &str {
+        self.name.as_str()
+    }
+
+    #[inline]
+    #[cfg(debug_assertions)]
+    pub(crate) fn get_name_str(&self) -> &Str {
+        &self.name
+    }
+
+    /// Get the version of the cmd.
+    #[inline]
+    pub fn get_version(&self) -> Option<&str> {
+        self.version.as_deref()
+    }
+
+    /// Get the long version of the cmd.
+    #[inline]
+    pub fn get_long_version(&self) -> Option<&str> {
+        self.long_version.as_deref()
+    }
+
+    /// Get the authors of the cmd.
+    #[inline]
+    pub fn get_author(&self) -> Option<&str> {
+        self.author.as_deref()
+    }
+
+    /// Get the short flag of the subcommand.
+    #[inline]
+    pub fn get_short_flag(&self) -> Option<char> {
+        self.short_flag
+    }
+
+    /// Get the long flag of the subcommand.
+    #[inline]
+    pub fn get_long_flag(&self) -> Option<&str> {
+        self.long_flag.as_deref()
+    }
+
+    /// Get the help message specified via [`Command::about`].
+    ///
+    /// [`Command::about`]: Command::about()
+    #[inline]
+    pub fn get_about(&self) -> Option<&StyledStr> {
+        self.about.as_ref()
+    }
+
+    /// Get the help message specified via [`Command::long_about`].
+    ///
+    /// [`Command::long_about`]: Command::long_about()
+    #[inline]
+    pub fn get_long_about(&self) -> Option<&StyledStr> {
+        self.long_about.as_ref()
+    }
+
+    /// Get the custom section heading specified via [`Command::flatten_help`].
+    #[inline]
+    pub fn is_flatten_help_set(&self) -> bool {
+        self.is_set(AppSettings::FlattenHelp)
+    }
+
+    /// Get the custom section heading specified via [`Command::next_help_heading`].
+    ///
+    /// [`Command::help_heading`]: Command::help_heading()
+    #[inline]
+    pub fn get_next_help_heading(&self) -> Option<&str> {
+        self.current_help_heading.as_deref()
+    }
+
+    /// Iterate through the *visible* aliases for this subcommand.
+    #[inline]
+    pub fn get_visible_aliases(&self) -> impl Iterator<Item = &str> + '_ {
+        self.aliases
+            .iter()
+            .filter(|(_, vis)| *vis)
+            .map(|a| a.0.as_str())
+    }
+
+    /// Iterate through the *visible* short aliases for this subcommand.
+    #[inline]
+    pub fn get_visible_short_flag_aliases(&self) -> impl Iterator<Item = char> + '_ {
+        self.short_flag_aliases
+            .iter()
+            .filter(|(_, vis)| *vis)
+            .map(|a| a.0)
+    }
+
+    /// Iterate through the *visible* long aliases for this subcommand.
+    #[inline]
+    pub fn get_visible_long_flag_aliases(&self) -> impl Iterator<Item = &str> + '_ {
+        self.long_flag_aliases
+            .iter()
+            .filter(|(_, vis)| *vis)
+            .map(|a| a.0.as_str())
+    }
+
+    /// Iterate through the set of *all* the aliases for this subcommand, both visible and hidden.
+    #[inline]
+    pub fn get_all_aliases(&self) -> impl Iterator<Item = &str> + '_ {
+        self.aliases.iter().map(|a| a.0.as_str())
+    }
+
+    /// Iterate through the set of *all* the short aliases for this subcommand, both visible and hidden.
+    #[inline]
+    pub fn get_all_short_flag_aliases(&self) -> impl Iterator<Item = char> + '_ {
+        self.short_flag_aliases.iter().map(|a| a.0)
+    }
+
+    /// Iterate through the set of *all* the long aliases for this subcommand, both visible and hidden.
+    #[inline]
+    pub fn get_all_long_flag_aliases(&self) -> impl Iterator<Item = &str> + '_ {
+        self.long_flag_aliases.iter().map(|a| a.0.as_str())
+    }
+
+    #[inline]
+    pub(crate) fn is_set(&self, s: AppSettings) -> bool {
+        self.settings.is_set(s) || self.g_settings.is_set(s)
+    }
+
+    /// Should we color the output?
+    pub fn get_color(&self) -> ColorChoice {
+        debug!("Command::color: Color setting...");
+
+        if cfg!(feature = "color") {
+            if self.is_set(AppSettings::ColorNever) {
+                debug!("Never");
+                ColorChoice::Never
+            } else if self.is_set(AppSettings::ColorAlways) {
+                debug!("Always");
+                ColorChoice::Always
+            } else {
+                debug!("Auto");
+                ColorChoice::Auto
+            }
+        } else {
+            ColorChoice::Never
+        }
+    }
+
+    /// Return the current `Styles` for the `Command`
+    #[inline]
+    pub fn get_styles(&self) -> &Styles {
+        self.app_ext.get().unwrap_or_default()
+    }
+
+    /// Iterate through the set of subcommands, getting a reference to each.
+    #[inline]
+    pub fn get_subcommands(&self) -> impl Iterator<Item = &Command> {
+        self.subcommands.iter()
+    }
+
+    /// Iterate through the set of subcommands, getting a mutable reference to each.
+    #[inline]
+    pub fn get_subcommands_mut(&mut self) -> impl Iterator<Item = &mut Command> {
+        self.subcommands.iter_mut()
+    }
+
+    /// Returns `true` if this `Command` has subcommands.
+    #[inline]
+    pub fn has_subcommands(&self) -> bool {
+        !self.subcommands.is_empty()
+    }
+
+    /// Returns the help heading for listing subcommands.
+    #[inline]
+    pub fn get_subcommand_help_heading(&self) -> Option<&str> {
+        self.subcommand_heading.as_deref()
+    }
+
+    /// Returns the subcommand value name.
+    #[inline]
+    pub fn get_subcommand_value_name(&self) -> Option<&str> {
+        self.subcommand_value_name.as_deref()
+    }
+
+    /// Returns the help heading for listing subcommands.
+    #[inline]
+    pub fn get_before_help(&self) -> Option<&StyledStr> {
+        self.before_help.as_ref()
+    }
+
+    /// Returns the help heading for listing subcommands.
+    #[inline]
+    pub fn get_before_long_help(&self) -> Option<&StyledStr> {
+        self.before_long_help.as_ref()
+    }
+
+    /// Returns the help heading for listing subcommands.
+    #[inline]
+    pub fn get_after_help(&self) -> Option<&StyledStr> {
+        self.after_help.as_ref()
+    }
+
+    /// Returns the help heading for listing subcommands.
+    #[inline]
+    pub fn get_after_long_help(&self) -> Option<&StyledStr> {
+        self.after_long_help.as_ref()
+    }
+
+    /// Find subcommand such that its name or one of aliases equals `name`.
+    ///
+    /// This does not recurse through subcommands of subcommands.
+    #[inline]
+    pub fn find_subcommand(&self, name: impl AsRef<std::ffi::OsStr>) -> Option<&Command> {
+        let name = name.as_ref();
+        self.get_subcommands().find(|s| s.aliases_to(name))
+    }
+
+    /// Find subcommand such that its name or one of aliases equals `name`, returning
+    /// a mutable reference to the subcommand.
+    ///
+    /// This does not recurse through subcommands of subcommands.
+    #[inline]
+    pub fn find_subcommand_mut(
+        &mut self,
+        name: impl AsRef<std::ffi::OsStr>,
+    ) -> Option<&mut Command> {
+        let name = name.as_ref();
+        self.get_subcommands_mut().find(|s| s.aliases_to(name))
+    }
+
+    /// Iterate through the set of groups.
+    #[inline]
+    pub fn get_groups(&self) -> impl Iterator<Item = &ArgGroup> {
+        self.groups.iter()
+    }
+
+    /// Iterate through the set of arguments.
+    #[inline]
+    pub fn get_arguments(&self) -> impl Iterator<Item = &Arg> {
+        self.args.args()
+    }
+
+    /// Iterate through the *positionals* arguments.
+    #[inline]
+    pub fn get_positionals(&self) -> impl Iterator<Item = &Arg> {
+        self.get_arguments().filter(|a| a.is_positional())
+    }
+
+    /// Iterate through the *options*.
+    pub fn get_opts(&self) -> impl Iterator<Item = &Arg> {
+        self.get_arguments()
+            .filter(|a| a.is_takes_value_set() && !a.is_positional())
+    }
+
+    /// Get a list of all arguments the given argument conflicts with.
+    ///
+    /// If the provided argument is declared as global, the conflicts will be determined
+    /// based on the propagation rules of global arguments.
+    ///
+    /// ### Panics
+    ///
+    /// If the given arg contains a conflict with an argument that is unknown to
+    /// this `Command`.
+    pub fn get_arg_conflicts_with(&self, arg: &Arg) -> Vec<&Arg> // FIXME: This could probably have been an iterator
+    {
+        if arg.is_global_set() {
+            self.get_global_arg_conflicts_with(arg)
+        } else {
+            let mut result = Vec::new();
+            for id in arg.blacklist.iter() {
+                if let Some(arg) = self.find(id) {
+                    result.push(arg);
+                } else if let Some(group) = self.find_group(id) {
+                    result.extend(
+                        self.unroll_args_in_group(&group.id)
+                            .iter()
+                            .map(|id| self.find(id).expect(INTERNAL_ERROR_MSG)),
+                    );
+                } else {
+                    panic!("Command::get_arg_conflicts_with: The passed arg conflicts with an arg unknown to the cmd");
+                }
+            }
+            result
+        }
+    }
+
+    // Get a unique list of all arguments of all commands and continuous subcommands the given argument conflicts with.
+    //
+    // This behavior follows the propagation rules of global arguments.
+    // It is useful for finding conflicts for arguments declared as global.
+    //
+    // ### Panics
+    //
+    // If the given arg contains a conflict with an argument that is unknown to
+    // this `Command`.
+    fn get_global_arg_conflicts_with(&self, arg: &Arg) -> Vec<&Arg> // FIXME: This could probably have been an iterator
+    {
+        arg.blacklist
+            .iter()
+            .map(|id| {
+                self.args
+                    .args()
+                    .chain(
+                        self.get_subcommands_containing(arg)
+                            .iter()
+                            .flat_map(|x| x.args.args()),
+                    )
+                    .find(|arg| arg.get_id() == id)
+                    .expect(
+                        "Command::get_arg_conflicts_with: \
+                    The passed arg conflicts with an arg unknown to the cmd",
+                    )
+            })
+            .collect()
+    }
+
+    // Get a list of subcommands which contain the provided Argument
+    //
+    // This command will only include subcommands in its list for which the subcommands
+    // parent also contains the Argument.
+    //
+    // This search follows the propagation rules of global arguments.
+    // It is useful to finding subcommands, that have inherited a global argument.
+    //
+    // **NOTE:** In this case only Sucommand_1 will be included
+    //   Subcommand_1 (contains Arg)
+    //     Subcommand_1.1 (doesn't contain Arg)
+    //       Subcommand_1.1.1 (contains Arg)
+    //
+    fn get_subcommands_containing(&self, arg: &Arg) -> Vec<&Self> {
+        let mut vec = std::vec::Vec::new();
+        for idx in 0..self.subcommands.len() {
+            if self.subcommands[idx]
+                .args
+                .args()
+                .any(|ar| ar.get_id() == arg.get_id())
+            {
+                vec.push(&self.subcommands[idx]);
+                vec.append(&mut self.subcommands[idx].get_subcommands_containing(arg));
+            }
+        }
+        vec
+    }
+
+    /// Report whether [`Command::no_binary_name`] is set
+    pub fn is_no_binary_name_set(&self) -> bool {
+        self.is_set(AppSettings::NoBinaryName)
+    }
+
+    /// Report whether [`Command::ignore_errors`] is set
+    pub(crate) fn is_ignore_errors_set(&self) -> bool {
+        self.is_set(AppSettings::IgnoreErrors)
+    }
+
+    /// Report whether [`Command::dont_delimit_trailing_values`] is set
+    pub fn is_dont_delimit_trailing_values_set(&self) -> bool {
+        self.is_set(AppSettings::DontDelimitTrailingValues)
+    }
+
+    /// Report whether [`Command::disable_version_flag`] is set
+    pub fn is_disable_version_flag_set(&self) -> bool {
+        self.is_set(AppSettings::DisableVersionFlag)
+            || (self.version.is_none() && self.long_version.is_none())
+    }
+
+    /// Report whether [`Command::propagate_version`] is set
+    pub fn is_propagate_version_set(&self) -> bool {
+        self.is_set(AppSettings::PropagateVersion)
+    }
+
+    /// Report whether [`Command::next_line_help`] is set
+    pub fn is_next_line_help_set(&self) -> bool {
+        self.is_set(AppSettings::NextLineHelp)
+    }
+
+    /// Report whether [`Command::disable_help_flag`] is set
+    pub fn is_disable_help_flag_set(&self) -> bool {
+        self.is_set(AppSettings::DisableHelpFlag)
+    }
+
+    /// Report whether [`Command::disable_help_subcommand`] is set
+    pub fn is_disable_help_subcommand_set(&self) -> bool {
+        self.is_set(AppSettings::DisableHelpSubcommand)
+    }
+
+    /// Report whether [`Command::disable_colored_help`] is set
+    pub fn is_disable_colored_help_set(&self) -> bool {
+        self.is_set(AppSettings::DisableColoredHelp)
+    }
+
+    /// Report whether [`Command::help_expected`] is set
+    #[cfg(debug_assertions)]
+    pub(crate) fn is_help_expected_set(&self) -> bool {
+        self.is_set(AppSettings::HelpExpected)
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "This is now the default")
+    )]
+    pub fn is_dont_collapse_args_in_usage_set(&self) -> bool {
+        true
+    }
+
+    /// Report whether [`Command::infer_long_args`] is set
+    pub(crate) fn is_infer_long_args_set(&self) -> bool {
+        self.is_set(AppSettings::InferLongArgs)
+    }
+
+    /// Report whether [`Command::infer_subcommands`] is set
+    pub(crate) fn is_infer_subcommands_set(&self) -> bool {
+        self.is_set(AppSettings::InferSubcommands)
+    }
+
+    /// Report whether [`Command::arg_required_else_help`] is set
+    pub fn is_arg_required_else_help_set(&self) -> bool {
+        self.is_set(AppSettings::ArgRequiredElseHelp)
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(
+            since = "4.0.0",
+            note = "Replaced with `Arg::is_allow_hyphen_values_set`"
+        )
+    )]
+    pub(crate) fn is_allow_hyphen_values_set(&self) -> bool {
+        self.is_set(AppSettings::AllowHyphenValues)
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(
+            since = "4.0.0",
+            note = "Replaced with `Arg::is_allow_negative_numbers_set`"
+        )
+    )]
+    pub fn is_allow_negative_numbers_set(&self) -> bool {
+        self.is_set(AppSettings::AllowNegativeNumbers)
+    }
+
+    #[doc(hidden)]
+    #[cfg_attr(
+        feature = "deprecated",
+        deprecated(since = "4.0.0", note = "Replaced with `Arg::is_trailing_var_arg_set`")
+    )]
+    pub fn is_trailing_var_arg_set(&self) -> bool {
+        self.is_set(AppSettings::TrailingVarArg)
+    }
+
+    /// Report whether [`Command::allow_missing_positional`] is set
+    pub fn is_allow_missing_positional_set(&self) -> bool {
+        self.is_set(AppSettings::AllowMissingPositional)
+    }
+
+    /// Report whether [`Command::hide`] is set
+    pub fn is_hide_set(&self) -> bool {
+        self.is_set(AppSettings::Hidden)
+    }
+
+    /// Report whether [`Command::subcommand_required`] is set
+    pub fn is_subcommand_required_set(&self) -> bool {
+        self.is_set(AppSettings::SubcommandRequired)
+    }
+
+    /// Report whether [`Command::allow_external_subcommands`] is set
+    pub fn is_allow_external_subcommands_set(&self) -> bool {
+        self.is_set(AppSettings::AllowExternalSubcommands)
+    }
+
+    /// Configured parser for values passed to an external subcommand
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// let cmd = clap::Command::new("raw")
+    ///     .external_subcommand_value_parser(clap::value_parser!(String));
+    /// let value_parser = cmd.get_external_subcommand_value_parser();
+    /// println!("{value_parser:?}");
+    /// ```
+    pub fn get_external_subcommand_value_parser(&self) -> Option<&super::ValueParser> {
+        if !self.is_allow_external_subcommands_set() {
+            None
+        } else {
+            static DEFAULT: super::ValueParser = super::ValueParser::os_string();
+            Some(self.external_value_parser.as_ref().unwrap_or(&DEFAULT))
+        }
+    }
+
+    /// Report whether [`Command::args_conflicts_with_subcommands`] is set
+    pub fn is_args_conflicts_with_subcommands_set(&self) -> bool {
+        self.is_set(AppSettings::ArgsNegateSubcommands)
+    }
+
+    #[doc(hidden)]
+    pub fn is_args_override_self(&self) -> bool {
+        self.is_set(AppSettings::AllArgsOverrideSelf)
+    }
+
+    /// Report whether [`Command::subcommand_precedence_over_arg`] is set
+    pub fn is_subcommand_precedence_over_arg_set(&self) -> bool {
+        self.is_set(AppSettings::SubcommandPrecedenceOverArg)
+    }
+
+    /// Report whether [`Command::subcommand_negates_reqs`] is set
+    pub fn is_subcommand_negates_reqs_set(&self) -> bool {
+        self.is_set(AppSettings::SubcommandsNegateReqs)
+    }
+
+    /// Report whether [`Command::multicall`] is set
+    pub fn is_multicall_set(&self) -> bool {
+        self.is_set(AppSettings::Multicall)
+    }
+}
+
+// Internally used only
+impl Command {
+    pub(crate) fn get_override_usage(&self) -> Option<&StyledStr> {
+        self.usage_str.as_ref()
+    }
+
+    pub(crate) fn get_override_help(&self) -> Option<&StyledStr> {
+        self.help_str.as_ref()
+    }
+
+    #[cfg(feature = "help")]
+    pub(crate) fn get_help_template(&self) -> Option<&StyledStr> {
+        self.template.as_ref()
+    }
+
+    #[cfg(feature = "help")]
+    pub(crate) fn get_term_width(&self) -> Option<usize> {
+        self.app_ext.get::<TermWidth>().map(|e| e.0)
+    }
+
+    #[cfg(feature = "help")]
+    pub(crate) fn get_max_term_width(&self) -> Option<usize> {
+        self.app_ext.get::<MaxTermWidth>().map(|e| e.0)
+    }
+
+    pub(crate) fn get_keymap(&self) -> &MKeyMap {
+        &self.args
+    }
+
+    fn get_used_global_args(&self, matches: &ArgMatches, global_arg_vec: &mut Vec<Id>) {
+        global_arg_vec.extend(
+            self.args
+                .args()
+                .filter(|a| a.is_global_set())
+                .map(|ga| ga.id.clone()),
+        );
+        if let Some((id, matches)) = matches.subcommand() {
+            if let Some(used_sub) = self.find_subcommand(id) {
+                used_sub.get_used_global_args(matches, global_arg_vec);
+            }
+        }
+    }
+
+    fn _do_parse(
+        &mut self,
+        raw_args: &mut clap_lex::RawArgs,
+        args_cursor: clap_lex::ArgCursor,
+    ) -> ClapResult<ArgMatches> {
+        debug!("Command::_do_parse");
+
+        // If there are global arguments, or settings we need to propagate them down to subcommands
+        // before parsing in case we run into a subcommand
+        self._build_self(false);
+
+        let mut matcher = ArgMatcher::new(self);
+
+        // do the real parsing
+        let mut parser = Parser::new(self);
+        if let Err(error) = parser.get_matches_with(&mut matcher, raw_args, args_cursor) {
+            if self.is_set(AppSettings::IgnoreErrors) && error.use_stderr() {
+                debug!("Command::_do_parse: ignoring error: {error}");
+            } else {
+                return Err(error);
+            }
+        }
+
+        let mut global_arg_vec = Default::default();
+        self.get_used_global_args(&matcher, &mut global_arg_vec);
+
+        matcher.propagate_globals(&global_arg_vec);
+
+        Ok(matcher.into_inner())
+    }
+
+    /// Prepare for introspecting on all included [`Command`]s
+    ///
+    /// Call this on the top-level [`Command`] when done building and before reading state for
+    /// cases like completions, custom help output, etc.
+    pub fn build(&mut self) {
+        self._build_recursive(true);
+        self._build_bin_names_internal();
+    }
+
+    pub(crate) fn _build_recursive(&mut self, expand_help_tree: bool) {
+        self._build_self(expand_help_tree);
+        for subcmd in self.get_subcommands_mut() {
+            subcmd._build_recursive(expand_help_tree);
+        }
+    }
+
+    pub(crate) fn _build_self(&mut self, expand_help_tree: bool) {
+        debug!("Command::_build: name={:?}", self.get_name());
+        if !self.settings.is_set(AppSettings::Built) {
+            if let Some(deferred) = self.deferred.take() {
+                *self = (deferred)(std::mem::take(self));
+            }
+
+            // Make sure all the globally set flags apply to us as well
+            self.settings = self.settings | self.g_settings;
+
+            if self.is_multicall_set() {
+                self.settings.set(AppSettings::SubcommandRequired);
+                self.settings.set(AppSettings::DisableHelpFlag);
+                self.settings.set(AppSettings::DisableVersionFlag);
+            }
+            if !cfg!(feature = "help") && self.get_override_help().is_none() {
+                self.settings.set(AppSettings::DisableHelpFlag);
+                self.settings.set(AppSettings::DisableHelpSubcommand);
+            }
+            if self.is_set(AppSettings::ArgsNegateSubcommands) {
+                self.settings.set(AppSettings::SubcommandsNegateReqs);
+            }
+            if self.external_value_parser.is_some() {
+                self.settings.set(AppSettings::AllowExternalSubcommands);
+            }
+            if !self.has_subcommands() {
+                self.settings.set(AppSettings::DisableHelpSubcommand);
+            }
+
+            self._propagate();
+            self._check_help_and_version(expand_help_tree);
+            self._propagate_global_args();
+
+            let mut pos_counter = 1;
+            let hide_pv = self.is_set(AppSettings::HidePossibleValues);
+            for a in self.args.args_mut() {
+                // Fill in the groups
+                for g in &a.groups {
+                    if let Some(ag) = self.groups.iter_mut().find(|grp| grp.id == *g) {
+                        ag.args.push(a.get_id().clone());
+                    } else {
+                        let mut ag = ArgGroup::new(g);
+                        ag.args.push(a.get_id().clone());
+                        self.groups.push(ag);
+                    }
+                }
+
+                // Figure out implied settings
+                a._build();
+                if hide_pv && a.is_takes_value_set() {
+                    a.settings.set(ArgSettings::HidePossibleValues);
+                }
+                if a.is_positional() && a.index.is_none() {
+                    a.index = Some(pos_counter);
+                    pos_counter += 1;
+                }
+            }
+
+            self.args._build();
+
+            #[allow(deprecated)]
+            {
+                let highest_idx = self
+                    .get_keymap()
+                    .keys()
+                    .filter_map(|x| {
+                        if let crate::mkeymap::KeyType::Position(n) = x {
+                            Some(*n)
+                        } else {
+                            None
+                        }
+                    })
+                    .max()
+                    .unwrap_or(0);
+                let is_trailing_var_arg_set = self.is_trailing_var_arg_set();
+                let is_allow_hyphen_values_set = self.is_allow_hyphen_values_set();
+                let is_allow_negative_numbers_set = self.is_allow_negative_numbers_set();
+                for arg in self.args.args_mut() {
+                    if is_allow_hyphen_values_set && arg.is_takes_value_set() {
+                        arg.settings.set(ArgSettings::AllowHyphenValues);
+                    }
+                    if is_allow_negative_numbers_set && arg.is_takes_value_set() {
+                        arg.settings.set(ArgSettings::AllowNegativeNumbers);
+                    }
+                    if is_trailing_var_arg_set && arg.get_index() == Some(highest_idx) {
+                        arg.settings.set(ArgSettings::TrailingVarArg);
+                    }
+                }
+            }
+
+            #[cfg(debug_assertions)]
+            assert_app(self);
+            self.settings.set(AppSettings::Built);
+        } else {
+            debug!("Command::_build: already built");
+        }
+    }
+
+    pub(crate) fn _build_subcommand(&mut self, name: &str) -> Option<&mut Self> {
+        use std::fmt::Write;
+
+        let mut mid_string = String::from(" ");
+        #[cfg(feature = "usage")]
+        if !self.is_subcommand_negates_reqs_set() && !self.is_args_conflicts_with_subcommands_set()
+        {
+            let reqs = Usage::new(self).get_required_usage_from(&[], None, true); // maybe Some(m)
+
+            for s in &reqs {
+                mid_string.push_str(&s.to_string());
+                mid_string.push(' ');
+            }
+        }
+        let is_multicall_set = self.is_multicall_set();
+
+        let sc = some!(self.subcommands.iter_mut().find(|s| s.name == name));
+
+        // Display subcommand name, short and long in usage
+        let mut sc_names = String::new();
+        sc_names.push_str(sc.name.as_str());
+        let mut flag_subcmd = false;
+        if let Some(l) = sc.get_long_flag() {
+            write!(sc_names, "|--{l}").unwrap();
+            flag_subcmd = true;
+        }
+        if let Some(s) = sc.get_short_flag() {
+            write!(sc_names, "|-{s}").unwrap();
+            flag_subcmd = true;
+        }
+
+        if flag_subcmd {
+            sc_names = format!("{{{sc_names}}}");
+        }
+
+        let usage_name = self
+            .bin_name
+            .as_ref()
+            .map(|bin_name| format!("{bin_name}{mid_string}{sc_names}"))
+            .unwrap_or(sc_names);
+        sc.usage_name = Some(usage_name);
+
+        // bin_name should be parent's bin_name + [<reqs>] + the sc's name separated by
+        // a space
+        let bin_name = format!(
+            "{}{}{}",
+            self.bin_name.as_deref().unwrap_or_default(),
+            if self.bin_name.is_some() { " " } else { "" },
+            &*sc.name
+        );
+        debug!(
+            "Command::_build_subcommand Setting bin_name of {} to {:?}",
+            sc.name, bin_name
+        );
+        sc.bin_name = Some(bin_name);
+
+        if sc.display_name.is_none() {
+            let self_display_name = if is_multicall_set {
+                self.display_name.as_deref().unwrap_or("")
+            } else {
+                self.display_name.as_deref().unwrap_or(&self.name)
+            };
+            let display_name = format!(
+                "{}{}{}",
+                self_display_name,
+                if !self_display_name.is_empty() {
+                    "-"
+                } else {
+                    ""
+                },
+                &*sc.name
+            );
+            debug!(
+                "Command::_build_subcommand Setting display_name of {} to {:?}",
+                sc.name, display_name
+            );
+            sc.display_name = Some(display_name);
+        }
+
+        // Ensure all args are built and ready to parse
+        sc._build_self(false);
+
+        Some(sc)
+    }
+
+    fn _build_bin_names_internal(&mut self) {
+        debug!("Command::_build_bin_names");
+
+        if !self.is_set(AppSettings::BinNameBuilt) {
+            let mut mid_string = String::from(" ");
+            #[cfg(feature = "usage")]
+            if !self.is_subcommand_negates_reqs_set()
+                && !self.is_args_conflicts_with_subcommands_set()
+            {
+                let reqs = Usage::new(self).get_required_usage_from(&[], None, true); // maybe Some(m)
+
+                for s in &reqs {
+                    mid_string.push_str(&s.to_string());
+                    mid_string.push(' ');
+                }
+            }
+            let is_multicall_set = self.is_multicall_set();
+
+            let self_bin_name = if is_multicall_set {
+                self.bin_name.as_deref().unwrap_or("")
+            } else {
+                self.bin_name.as_deref().unwrap_or(&self.name)
+            }
+            .to_owned();
+
+            for sc in &mut self.subcommands {
+                debug!("Command::_build_bin_names:iter: bin_name set...");
+
+                if sc.usage_name.is_none() {
+                    use std::fmt::Write;
+                    // Display subcommand name, short and long in usage
+                    let mut sc_names = String::new();
+                    sc_names.push_str(sc.name.as_str());
+                    let mut flag_subcmd = false;
+                    if let Some(l) = sc.get_long_flag() {
+                        write!(sc_names, "|--{l}").unwrap();
+                        flag_subcmd = true;
+                    }
+                    if let Some(s) = sc.get_short_flag() {
+                        write!(sc_names, "|-{s}").unwrap();
+                        flag_subcmd = true;
+                    }
+
+                    if flag_subcmd {
+                        sc_names = format!("{{{sc_names}}}");
+                    }
+
+                    let usage_name = format!("{self_bin_name}{mid_string}{sc_names}");
+                    debug!(
+                        "Command::_build_bin_names:iter: Setting usage_name of {} to {:?}",
+                        sc.name, usage_name
+                    );
+                    sc.usage_name = Some(usage_name);
+                } else {
+                    debug!(
+                        "Command::_build_bin_names::iter: Using existing usage_name of {} ({:?})",
+                        sc.name, sc.usage_name
+                    );
+                }
+
+                if sc.bin_name.is_none() {
+                    let bin_name = format!(
+                        "{}{}{}",
+                        self_bin_name,
+                        if !self_bin_name.is_empty() { " " } else { "" },
+                        &*sc.name
+                    );
+                    debug!(
+                        "Command::_build_bin_names:iter: Setting bin_name of {} to {:?}",
+                        sc.name, bin_name
+                    );
+                    sc.bin_name = Some(bin_name);
+                } else {
+                    debug!(
+                        "Command::_build_bin_names::iter: Using existing bin_name of {} ({:?})",
+                        sc.name, sc.bin_name
+                    );
+                }
+
+                if sc.display_name.is_none() {
+                    let self_display_name = if is_multicall_set {
+                        self.display_name.as_deref().unwrap_or("")
+                    } else {
+                        self.display_name.as_deref().unwrap_or(&self.name)
+                    };
+                    let display_name = format!(
+                        "{}{}{}",
+                        self_display_name,
+                        if !self_display_name.is_empty() {
+                            "-"
+                        } else {
+                            ""
+                        },
+                        &*sc.name
+                    );
+                    debug!(
+                        "Command::_build_bin_names:iter: Setting display_name of {} to {:?}",
+                        sc.name, display_name
+                    );
+                    sc.display_name = Some(display_name);
+                } else {
+                    debug!(
+                        "Command::_build_bin_names::iter: Using existing display_name of {} ({:?})",
+                        sc.name, sc.display_name
+                    );
+                }
+
+                sc._build_bin_names_internal();
+            }
+            self.set(AppSettings::BinNameBuilt);
+        } else {
+            debug!("Command::_build_bin_names: already built");
+        }
+    }
+
+    pub(crate) fn _panic_on_missing_help(&self, help_required_globally: bool) {
+        if self.is_set(AppSettings::HelpExpected) || help_required_globally {
+            let args_missing_help: Vec<Id> = self
+                .args
+                .args()
+                .filter(|arg| arg.get_help().is_none() && arg.get_long_help().is_none())
+                .map(|arg| arg.get_id().clone())
+                .collect();
+
+            debug_assert!(args_missing_help.is_empty(),
+                    "Command::help_expected is enabled for the Command {}, but at least one of its arguments does not have either `help` or `long_help` set. List of such arguments: {}",
+                    self.name,
+                    args_missing_help.join(", ")
+                );
+        }
+
+        for sub_app in &self.subcommands {
+            sub_app._panic_on_missing_help(help_required_globally);
+        }
+    }
+
+    #[cfg(debug_assertions)]
+    pub(crate) fn two_args_of<F>(&self, condition: F) -> Option<(&Arg, &Arg)>
+    where
+        F: Fn(&Arg) -> bool,
+    {
+        two_elements_of(self.args.args().filter(|a: &&Arg| condition(a)))
+    }
+
+    // just in case
+    #[allow(unused)]
+    fn two_groups_of<F>(&self, condition: F) -> Option<(&ArgGroup, &ArgGroup)>
+    where
+        F: Fn(&ArgGroup) -> bool,
+    {
+        two_elements_of(self.groups.iter().filter(|a| condition(a)))
+    }
+
+    /// Propagate global args
+    pub(crate) fn _propagate_global_args(&mut self) {
+        debug!("Command::_propagate_global_args:{}", self.name);
+
+        let autogenerated_help_subcommand = !self.is_disable_help_subcommand_set();
+
+        for sc in &mut self.subcommands {
+            if sc.get_name() == "help" && autogenerated_help_subcommand {
+                // Avoid propagating args to the autogenerated help subtrees used in completion.
+                // This prevents args from showing up during help completions like
+                // `myapp help subcmd <TAB>`, which should only suggest subcommands and not args,
+                // while still allowing args to show up properly on the generated help message.
+                continue;
+            }
+
+            for a in self.args.args().filter(|a| a.is_global_set()) {
+                if sc.find(&a.id).is_some() {
+                    debug!(
+                        "Command::_propagate skipping {:?} to {}, already exists",
+                        a.id,
+                        sc.get_name(),
+                    );
+                    continue;
+                }
+
+                debug!(
+                    "Command::_propagate pushing {:?} to {}",
+                    a.id,
+                    sc.get_name(),
+                );
+                sc.args.push(a.clone());
+            }
+        }
+    }
+
+    /// Propagate settings
+    pub(crate) fn _propagate(&mut self) {
+        debug!("Command::_propagate:{}", self.name);
+        let mut subcommands = std::mem::take(&mut self.subcommands);
+        for sc in &mut subcommands {
+            self._propagate_subcommand(sc);
+        }
+        self.subcommands = subcommands;
+    }
+
+    fn _propagate_subcommand(&self, sc: &mut Self) {
+        // We have to create a new scope in order to tell rustc the borrow of `sc` is
+        // done and to recursively call this method
+        {
+            if self.settings.is_set(AppSettings::PropagateVersion) {
+                if let Some(version) = self.version.as_ref() {
+                    sc.version.get_or_insert_with(|| version.clone());
+                }
+                if let Some(long_version) = self.long_version.as_ref() {
+                    sc.long_version.get_or_insert_with(|| long_version.clone());
+                }
+            }
+
+            sc.settings = sc.settings | self.g_settings;
+            sc.g_settings = sc.g_settings | self.g_settings;
+            sc.app_ext.update(&self.app_ext);
+        }
+    }
+
+    pub(crate) fn _check_help_and_version(&mut self, expand_help_tree: bool) {
+        debug!(
+            "Command::_check_help_and_version:{} expand_help_tree={}",
+            self.name, expand_help_tree
+        );
+
+        self.long_help_exists = self.long_help_exists_();
+
+        if !self.is_disable_help_flag_set() {
+            debug!("Command::_check_help_and_version: Building default --help");
+            let mut arg = Arg::new(Id::HELP)
+                .short('h')
+                .long("help")
+                .action(ArgAction::Help);
+            if self.long_help_exists {
+                arg = arg
+                    .help("Print help (see more with '--help')")
+                    .long_help("Print help (see a summary with '-h')");
+            } else {
+                arg = arg.help("Print help");
+            }
+            // Avoiding `arg_internal` to not be sensitive to `next_help_heading` /
+            // `next_display_order`
+            self.args.push(arg);
+        }
+        if !self.is_disable_version_flag_set() {
+            debug!("Command::_check_help_and_version: Building default --version");
+            let arg = Arg::new(Id::VERSION)
+                .short('V')
+                .long("version")
+                .action(ArgAction::Version)
+                .help("Print version");
+            // Avoiding `arg_internal` to not be sensitive to `next_help_heading` /
+            // `next_display_order`
+            self.args.push(arg);
+        }
+
+        if !self.is_set(AppSettings::DisableHelpSubcommand) {
+            debug!("Command::_check_help_and_version: Building help subcommand");
+            let help_about = "Print this message or the help of the given subcommand(s)";
+
+            let mut help_subcmd = if expand_help_tree {
+                // Slow code path to recursively clone all other subcommand subtrees under help
+                let help_subcmd = Command::new("help")
+                    .about(help_about)
+                    .global_setting(AppSettings::DisableHelpSubcommand)
+                    .subcommands(self.get_subcommands().map(Command::_copy_subtree_for_help));
+
+                let mut help_help_subcmd = Command::new("help").about(help_about);
+                help_help_subcmd.version = None;
+                help_help_subcmd.long_version = None;
+                help_help_subcmd = help_help_subcmd
+                    .setting(AppSettings::DisableHelpFlag)
+                    .setting(AppSettings::DisableVersionFlag);
+
+                help_subcmd.subcommand(help_help_subcmd)
+            } else {
+                Command::new("help").about(help_about).arg(
+                    Arg::new("subcommand")
+                        .action(ArgAction::Append)
+                        .num_args(..)
+                        .value_name("COMMAND")
+                        .help("Print help for the subcommand(s)"),
+                )
+            };
+            self._propagate_subcommand(&mut help_subcmd);
+
+            // The parser acts like this is set, so let's set it so we don't falsely
+            // advertise it to the user
+            help_subcmd.version = None;
+            help_subcmd.long_version = None;
+            help_subcmd = help_subcmd
+                .setting(AppSettings::DisableHelpFlag)
+                .setting(AppSettings::DisableVersionFlag)
+                .unset_global_setting(AppSettings::PropagateVersion);
+
+            self.subcommands.push(help_subcmd);
+        }
+    }
+
+    fn _copy_subtree_for_help(&self) -> Command {
+        let mut cmd = Command::new(self.name.clone())
+            .hide(self.is_hide_set())
+            .global_setting(AppSettings::DisableHelpFlag)
+            .global_setting(AppSettings::DisableVersionFlag)
+            .subcommands(self.get_subcommands().map(Command::_copy_subtree_for_help));
+        if self.get_about().is_some() {
+            cmd = cmd.about(self.get_about().unwrap().clone());
+        }
+        cmd
+    }
+
+    pub(crate) fn _render_version(&self, use_long: bool) -> String {
+        debug!("Command::_render_version");
+
+        let ver = if use_long {
+            self.long_version
+                .as_deref()
+                .or(self.version.as_deref())
+                .unwrap_or_default()
+        } else {
+            self.version
+                .as_deref()
+                .or(self.long_version.as_deref())
+                .unwrap_or_default()
+        };
+        let display_name = self.get_display_name().unwrap_or_else(|| self.get_name());
+        format!("{display_name} {ver}\n")
+    }
+
+    pub(crate) fn format_group(&self, g: &Id) -> StyledStr {
+        let g_string = self
+            .unroll_args_in_group(g)
+            .iter()
+            .filter_map(|x| self.find(x))
+            .map(|x| {
+                if x.is_positional() {
+                    // Print val_name for positional arguments. e.g. <file_name>
+                    x.name_no_brackets()
+                } else {
+                    // Print usage string for flags arguments, e.g. <--help>
+                    x.to_string()
+                }
+            })
+            .collect::<Vec<_>>()
+            .join("|");
+        let mut styled = StyledStr::new();
+        styled.push_str("<");
+        styled.push_string(g_string);
+        styled.push_str(">");
+        styled
+    }
+}
+
+/// A workaround:
+/// <https://github.com/rust-lang/rust/issues/34511#issuecomment-373423999>
+pub(crate) trait Captures<'a> {}
+impl<'a, T> Captures<'a> for T {}
+
+// Internal Query Methods
+impl Command {
+    /// Iterate through the *flags* & *options* arguments.
+    #[cfg(any(feature = "usage", feature = "help"))]
+    pub(crate) fn get_non_positionals(&self) -> impl Iterator<Item = &Arg> {
+        self.get_arguments().filter(|a| !a.is_positional())
+    }
+
+    pub(crate) fn find(&self, arg_id: &Id) -> Option<&Arg> {
+        self.args.args().find(|a| a.get_id() == arg_id)
+    }
+
+    #[inline]
+    pub(crate) fn contains_short(&self, s: char) -> bool {
+        debug_assert!(
+            self.is_set(AppSettings::Built),
+            "If Command::_build hasn't been called, manually search through Arg shorts"
+        );
+
+        self.args.contains(s)
+    }
+
+    #[inline]
+    pub(crate) fn set(&mut self, s: AppSettings) {
+        self.settings.set(s)
+    }
+
+    #[inline]
+    pub(crate) fn has_positionals(&self) -> bool {
+        self.get_positionals().next().is_some()
+    }
+
+    #[cfg(any(feature = "usage", feature = "help"))]
+    pub(crate) fn has_visible_subcommands(&self) -> bool {
+        self.subcommands
+            .iter()
+            .any(|sc| sc.name != "help" && !sc.is_set(AppSettings::Hidden))
+    }
+
+    /// Check if this subcommand can be referred to as `name`. In other words,
+    /// check if `name` is the name of this subcommand or is one of its aliases.
+    #[inline]
+    pub(crate) fn aliases_to(&self, name: impl AsRef<std::ffi::OsStr>) -> bool {
+        let name = name.as_ref();
+        self.get_name() == name || self.get_all_aliases().any(|alias| alias == name)
+    }
+
+    /// Check if this subcommand can be referred to as `name`. In other words,
+    /// check if `name` is the name of this short flag subcommand or is one of its short flag aliases.
+    #[inline]
+    pub(crate) fn short_flag_aliases_to(&self, flag: char) -> bool {
+        Some(flag) == self.short_flag
+            || self.get_all_short_flag_aliases().any(|alias| flag == alias)
+    }
+
+    /// Check if this subcommand can be referred to as `name`. In other words,
+    /// check if `name` is the name of this long flag subcommand or is one of its long flag aliases.
+    #[inline]
+    pub(crate) fn long_flag_aliases_to(&self, flag: &str) -> bool {
+        match self.long_flag.as_ref() {
+            Some(long_flag) => {
+                long_flag == flag || self.get_all_long_flag_aliases().any(|alias| alias == flag)
+            }
+            None => self.get_all_long_flag_aliases().any(|alias| alias == flag),
+        }
+    }
+
+    #[cfg(debug_assertions)]
+    pub(crate) fn id_exists(&self, id: &Id) -> bool {
+        self.args.args().any(|x| x.get_id() == id) || self.groups.iter().any(|x| x.id == *id)
+    }
+
+    /// Iterate through the groups this arg is member of.
+    pub(crate) fn groups_for_arg<'a>(&'a self, arg: &Id) -> impl Iterator<Item = Id> + 'a {
+        debug!("Command::groups_for_arg: id={arg:?}");
+        let arg = arg.clone();
+        self.groups
+            .iter()
+            .filter(move |grp| grp.args.iter().any(|a| a == &arg))
+            .map(|grp| grp.id.clone())
+    }
+
+    pub(crate) fn find_group(&self, group_id: &Id) -> Option<&ArgGroup> {
+        self.groups.iter().find(|g| g.id == *group_id)
+    }
+
+    /// Iterate through all the names of all subcommands (not recursively), including aliases.
+    /// Used for suggestions.
+    pub(crate) fn all_subcommand_names(&self) -> impl Iterator<Item = &str> + Captures {
+        self.get_subcommands().flat_map(|sc| {
+            let name = sc.get_name();
+            let aliases = sc.get_all_aliases();
+            std::iter::once(name).chain(aliases)
+        })
+    }
+
+    pub(crate) fn required_graph(&self) -> ChildGraph<Id> {
+        let mut reqs = ChildGraph::with_capacity(5);
+        for a in self.args.args().filter(|a| a.is_required_set()) {
+            reqs.insert(a.get_id().clone());
+        }
+        for group in &self.groups {
+            if group.required {
+                let idx = reqs.insert(group.id.clone());
+                for a in &group.requires {
+                    reqs.insert_child(idx, a.clone());
+                }
+            }
+        }
+
+        reqs
+    }
+
+    pub(crate) fn unroll_args_in_group(&self, group: &Id) -> Vec<Id> {
+        debug!("Command::unroll_args_in_group: group={group:?}");
+        let mut g_vec = vec![group];
+        let mut args = vec![];
+
+        while let Some(g) = g_vec.pop() {
+            for n in self
+                .groups
+                .iter()
+                .find(|grp| grp.id == *g)
+                .expect(INTERNAL_ERROR_MSG)
+                .args
+                .iter()
+            {
+                debug!("Command::unroll_args_in_group:iter: entity={n:?}");
+                if !args.contains(n) {
+                    if self.find(n).is_some() {
+                        debug!("Command::unroll_args_in_group:iter: this is an arg");
+                        args.push(n.clone())
+                    } else {
+                        debug!("Command::unroll_args_in_group:iter: this is a group");
+                        g_vec.push(n);
+                    }
+                }
+            }
+        }
+
+        args
+    }
+
+    pub(crate) fn unroll_arg_requires<F>(&self, func: F, arg: &Id) -> Vec<Id>
+    where
+        F: Fn(&(ArgPredicate, Id)) -> Option<Id>,
+    {
+        let mut processed = vec![];
+        let mut r_vec = vec![arg];
+        let mut args = vec![];
+
+        while let Some(a) = r_vec.pop() {
+            if processed.contains(&a) {
+                continue;
+            }
+
+            processed.push(a);
+
+            if let Some(arg) = self.find(a) {
+                for r in arg.requires.iter().filter_map(&func) {
+                    if let Some(req) = self.find(&r) {
+                        if !req.requires.is_empty() {
+                            r_vec.push(req.get_id())
+                        }
+                    }
+                    args.push(r);
+                }
+            }
+        }
+
+        args
+    }
+
+    /// Find a flag subcommand name by short flag or an alias
+    pub(crate) fn find_short_subcmd(&self, c: char) -> Option<&str> {
+        self.get_subcommands()
+            .find(|sc| sc.short_flag_aliases_to(c))
+            .map(|sc| sc.get_name())
+    }
+
+    /// Find a flag subcommand name by long flag or an alias
+    pub(crate) fn find_long_subcmd(&self, long: &str) -> Option<&str> {
+        self.get_subcommands()
+            .find(|sc| sc.long_flag_aliases_to(long))
+            .map(|sc| sc.get_name())
+    }
+
+    #[cfg(feature = "help")]
+    pub(crate) fn get_display_order(&self) -> usize {
+        self.disp_ord.unwrap_or(999)
+    }
+
+    pub(crate) fn write_help_err(&self, mut use_long: bool) -> StyledStr {
+        debug!(
+            "Command::write_help_err: {}, use_long={:?}",
+            self.get_display_name().unwrap_or_else(|| self.get_name()),
+            use_long && self.long_help_exists(),
+        );
+
+        use_long = use_long && self.long_help_exists();
+        let usage = Usage::new(self);
+
+        let mut styled = StyledStr::new();
+        write_help(&mut styled, self, &usage, use_long);
+
+        styled
+    }
+
+    pub(crate) fn write_version_err(&self, use_long: bool) -> StyledStr {
+        let msg = self._render_version(use_long);
+        StyledStr::from(msg)
+    }
+
+    pub(crate) fn long_help_exists(&self) -> bool {
+        debug!("Command::long_help_exists: {}", self.long_help_exists);
+        self.long_help_exists
+    }
+
+    fn long_help_exists_(&self) -> bool {
+        debug!("Command::long_help_exists");
+        // In this case, both must be checked. This allows the retention of
+        // original formatting, but also ensures that the actual -h or --help
+        // specified by the user is sent through. If hide_short_help is not included,
+        // then items specified with hidden_short_help will also be hidden.
+        let should_long = |v: &Arg| {
+            !v.is_hide_set()
+                && (v.get_long_help().is_some()
+                    || v.is_hide_long_help_set()
+                    || v.is_hide_short_help_set()
+                    || (!v.is_hide_possible_values_set()
+                        && v.get_possible_values()
+                            .iter()
+                            .any(PossibleValue::should_show_help)))
+        };
+
+        // Subcommands aren't checked because we prefer short help for them, deferring to
+        // `cmd subcmd --help` for more.
+        self.get_long_about().is_some()
+            || self.get_before_long_help().is_some()
+            || self.get_after_long_help().is_some()
+            || self.get_arguments().any(should_long)
+    }
+
+    // Should we color the help?
+    pub(crate) fn color_help(&self) -> ColorChoice {
+        #[cfg(feature = "color")]
+        if self.is_disable_colored_help_set() {
+            return ColorChoice::Never;
+        }
+
+        self.get_color()
+    }
+}
+
+impl Default for Command {
+    fn default() -> Self {
+        Self {
+            name: Default::default(),
+            long_flag: Default::default(),
+            short_flag: Default::default(),
+            display_name: Default::default(),
+            bin_name: Default::default(),
+            author: Default::default(),
+            version: Default::default(),
+            long_version: Default::default(),
+            about: Default::default(),
+            long_about: Default::default(),
+            before_help: Default::default(),
+            before_long_help: Default::default(),
+            after_help: Default::default(),
+            after_long_help: Default::default(),
+            aliases: Default::default(),
+            short_flag_aliases: Default::default(),
+            long_flag_aliases: Default::default(),
+            usage_str: Default::default(),
+            usage_name: Default::default(),
+            help_str: Default::default(),
+            disp_ord: Default::default(),
+            #[cfg(feature = "help")]
+            template: Default::default(),
+            settings: Default::default(),
+            g_settings: Default::default(),
+            args: Default::default(),
+            subcommands: Default::default(),
+            groups: Default::default(),
+            current_help_heading: Default::default(),
+            current_disp_ord: Some(0),
+            subcommand_value_name: Default::default(),
+            subcommand_heading: Default::default(),
+            external_value_parser: Default::default(),
+            long_help_exists: false,
+            deferred: None,
+            app_ext: Default::default(),
+        }
+    }
+}
+
+impl Index<&'_ Id> for Command {
+    type Output = Arg;
+
+    fn index(&self, key: &Id) -> &Self::Output {
+        self.find(key).expect(INTERNAL_ERROR_MSG)
+    }
+}
+
+impl From<&'_ Command> for Command {
+    fn from(cmd: &'_ Command) -> Self {
+        cmd.clone()
+    }
+}
+
+impl fmt::Display for Command {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.name)
+    }
+}
+
+pub(crate) trait AppTag: crate::builder::ext::Extension {}
+
+#[derive(Default, Copy, Clone, Debug)]
+struct TermWidth(usize);
+
+impl AppTag for TermWidth {}
+
+#[derive(Default, Copy, Clone, Debug)]
+struct MaxTermWidth(usize);
+
+impl AppTag for MaxTermWidth {}
+
+fn two_elements_of<I, T>(mut iter: I) -> Option<(T, T)>
+where
+    I: Iterator<Item = T>,
+{
+    let first = iter.next();
+    let second = iter.next();
+
+    match (first, second) {
+        (Some(first), Some(second)) => Some((first, second)),
+        _ => None,
+    }
+}
+
+#[test]
+fn check_auto_traits() {
+    static_assertions::assert_impl_all!(Command: Send, Sync, Unpin);
+}
diff --git a/vendor/clap_builder/src/builder/debug_asserts.rs b/vendor/clap_builder/src/builder/debug_asserts.rs
new file mode 100644
index 0000000..2b63384
--- /dev/null
+++ b/vendor/clap_builder/src/builder/debug_asserts.rs
@@ -0,0 +1,840 @@
+use std::cmp::Ordering;
+
+use crate::builder::ValueRange;
+use crate::mkeymap::KeyType;
+use crate::util::FlatSet;
+use crate::util::Id;
+use crate::ArgAction;
+use crate::INTERNAL_ERROR_MSG;
+use crate::{Arg, Command, ValueHint};
+
+pub(crate) fn assert_app(cmd: &Command) {
+    debug!("Command::_debug_asserts");
+
+    let mut short_flags = vec![];
+    let mut long_flags = vec![];
+
+    // Invalid version flag settings
+    if cmd.get_version().is_none() && cmd.get_long_version().is_none() {
+        // PropagateVersion is meaningless if there is no version
+        assert!(
+            !cmd.is_propagate_version_set(),
+            "Command {}: No version information via Command::version or Command::long_version to propagate",
+            cmd.get_name(),
+        );
+
+        // Used `Command::mut_arg("version", ..) but did not provide any version information to display
+        let version_needed = cmd
+            .get_arguments()
+            .filter(|x| matches!(x.get_action(), ArgAction::Version))
+            .map(|x| x.get_id())
+            .collect::<Vec<_>>();
+
+        assert_eq!(version_needed, Vec::<&str>::new(), "Command {}: `ArgAction::Version` used without providing Command::version or Command::long_version"
+            ,cmd.get_name()
+        );
+    }
+
+    for sc in cmd.get_subcommands() {
+        if let Some(s) = sc.get_short_flag().as_ref() {
+            short_flags.push(Flag::Command(format!("-{s}"), sc.get_name()));
+        }
+
+        for short_alias in sc.get_all_short_flag_aliases() {
+            short_flags.push(Flag::Command(format!("-{short_alias}"), sc.get_name()));
+        }
+
+        if let Some(l) = sc.get_long_flag().as_ref() {
+            assert!(!l.starts_with('-'), "Command {}: long_flag {:?} must not start with a `-`, that will be handled by the parser", sc.get_name(), l);
+            long_flags.push(Flag::Command(format!("--{l}"), sc.get_name()));
+        }
+
+        for long_alias in sc.get_all_long_flag_aliases() {
+            long_flags.push(Flag::Command(format!("--{long_alias}"), sc.get_name()));
+        }
+    }
+
+    for arg in cmd.get_arguments() {
+        assert_arg(arg);
+
+        assert!(
+            !cmd.is_multicall_set(),
+            "Command {}: Arguments like {} cannot be set on a multicall command",
+            cmd.get_name(),
+            arg.get_id()
+        );
+
+        if let Some(s) = arg.get_short() {
+            short_flags.push(Flag::Arg(format!("-{s}"), arg.get_id().as_str()));
+        }
+
+        for (short_alias, _) in &arg.short_aliases {
+            short_flags.push(Flag::Arg(format!("-{short_alias}"), arg.get_id().as_str()));
+        }
+
+        if let Some(l) = arg.get_long() {
+            assert!(!l.starts_with('-'), "Argument {}: long {:?} must not start with a `-`, that will be handled by the parser", arg.get_id(), l);
+            long_flags.push(Flag::Arg(format!("--{l}"), arg.get_id().as_str()));
+        }
+
+        for (long_alias, _) in &arg.aliases {
+            long_flags.push(Flag::Arg(format!("--{long_alias}"), arg.get_id().as_str()));
+        }
+
+        // Name conflicts
+        if let Some((first, second)) = cmd.two_args_of(|x| x.get_id() == arg.get_id()) {
+            panic!(
+            "Command {}: Argument names must be unique, but '{}' is in use by more than one argument or group{}",
+            cmd.get_name(),
+            arg.get_id(),
+            duplicate_tip(cmd, first, second),
+        );
+        }
+
+        // Long conflicts
+        if let Some(l) = arg.get_long() {
+            if let Some((first, second)) = cmd.two_args_of(|x| x.get_long() == Some(l)) {
+                panic!(
+                    "Command {}: Long option names must be unique for each argument, \
+                            but '--{}' is in use by both '{}' and '{}'{}",
+                    cmd.get_name(),
+                    l,
+                    first.get_id(),
+                    second.get_id(),
+                    duplicate_tip(cmd, first, second)
+                )
+            }
+        }
+
+        // Short conflicts
+        if let Some(s) = arg.get_short() {
+            if let Some((first, second)) = cmd.two_args_of(|x| x.get_short() == Some(s)) {
+                panic!(
+                    "Command {}: Short option names must be unique for each argument, \
+                            but '-{}' is in use by both '{}' and '{}'{}",
+                    cmd.get_name(),
+                    s,
+                    first.get_id(),
+                    second.get_id(),
+                    duplicate_tip(cmd, first, second),
+                )
+            }
+        }
+
+        // Index conflicts
+        if let Some(idx) = arg.index {
+            if let Some((first, second)) =
+                cmd.two_args_of(|x| x.is_positional() && x.get_index() == Some(idx))
+            {
+                panic!(
+                    "Command {}: Argument '{}' has the same index as '{}' \
+                    and they are both positional arguments\n\n\t \
+                    Use `Arg::num_args(1..)` to allow one \
+                    positional argument to take multiple values",
+                    cmd.get_name(),
+                    first.get_id(),
+                    second.get_id()
+                )
+            }
+        }
+
+        // requires, r_if, r_unless
+        for req in &arg.requires {
+            assert!(
+                cmd.id_exists(&req.1),
+                "Command {}: Argument or group '{}' specified in 'requires*' for '{}' does not exist",
+                cmd.get_name(),
+                req.1,
+                arg.get_id(),
+            );
+        }
+
+        for req in &arg.r_ifs {
+            assert!(
+                !arg.is_required_set(),
+                "Argument {}: `required` conflicts with `required_if_eq*`",
+                arg.get_id()
+            );
+            assert!(
+                cmd.id_exists(&req.0),
+                "Command {}: Argument or group '{}' specified in 'required_if_eq*' for '{}' does not exist",
+                    cmd.get_name(),
+                req.0,
+                arg.get_id()
+            );
+        }
+
+        for req in &arg.r_ifs_all {
+            assert!(
+                !arg.is_required_set(),
+                "Argument {}: `required` conflicts with `required_if_eq_all`",
+                arg.get_id()
+            );
+            assert!(
+                cmd.id_exists(&req.0),
+                "Command {}: Argument or group '{}' specified in 'required_if_eq_all' for '{}' does not exist",
+                    cmd.get_name(),
+                req.0,
+                arg.get_id()
+            );
+        }
+
+        for req in &arg.r_unless {
+            assert!(
+                !arg.is_required_set(),
+                "Argument {}: `required` conflicts with `required_unless*`",
+                arg.get_id()
+            );
+            assert!(
+                cmd.id_exists(req),
+                "Command {}: Argument or group '{}' specified in 'required_unless*' for '{}' does not exist",
+                    cmd.get_name(),
+                req,
+                arg.get_id(),
+            );
+        }
+
+        for req in &arg.r_unless_all {
+            assert!(
+                !arg.is_required_set(),
+                "Argument {}: `required` conflicts with `required_unless*`",
+                arg.get_id()
+            );
+            assert!(
+                cmd.id_exists(req),
+                "Command {}: Argument or group '{}' specified in 'required_unless*' for '{}' does not exist",
+                    cmd.get_name(),
+                req,
+                arg.get_id(),
+            );
+        }
+
+        // blacklist
+        for req in &arg.blacklist {
+            assert!(
+                cmd.id_exists(req),
+                "Command {}: Argument or group '{}' specified in 'conflicts_with*' for '{}' does not exist",
+                    cmd.get_name(),
+                req,
+                arg.get_id(),
+            );
+        }
+
+        // overrides
+        for req in &arg.overrides {
+            assert!(
+                cmd.id_exists(req),
+                "Command {}: Argument or group '{}' specified in 'overrides_with*' for '{}' does not exist",
+                    cmd.get_name(),
+                req,
+                arg.get_id(),
+            );
+        }
+
+        if arg.is_last_set() {
+            assert!(
+                arg.get_long().is_none(),
+                "Command {}: Flags or Options cannot have last(true) set. '{}' has both a long and last(true) set.",
+                    cmd.get_name(),
+                arg.get_id()
+            );
+            assert!(
+                arg.get_short().is_none(),
+                "Command {}: Flags or Options cannot have last(true) set. '{}' has both a short and last(true) set.",
+                    cmd.get_name(),
+                arg.get_id()
+            );
+        }
+
+        assert!(
+            !(arg.is_required_set() && arg.is_global_set()),
+            "Command {}: Global arguments cannot be required.\n\n\t'{}' is marked as both global and required",
+                    cmd.get_name(),
+            arg.get_id()
+        );
+
+        if arg.get_value_hint() == ValueHint::CommandWithArguments {
+            assert!(
+                arg.is_positional(),
+                "Command {}: Argument '{}' has hint CommandWithArguments and must be positional.",
+                cmd.get_name(),
+                arg.get_id()
+            );
+
+            assert!(
+                arg.is_trailing_var_arg_set() || arg.is_last_set(),
+                "Command {}: Positional argument '{}' has hint CommandWithArguments, so Command must have `trailing_var_arg(true)` or `last(true)` set.",
+                    cmd.get_name(),
+                arg.get_id()
+            );
+        }
+    }
+
+    for group in cmd.get_groups() {
+        // Name conflicts
+        assert!(
+            cmd.get_groups().filter(|x| x.id == group.id).count() < 2,
+            "Command {}: Argument group name must be unique\n\n\t'{}' is already in use",
+            cmd.get_name(),
+            group.get_id(),
+        );
+
+        // Groups should not have naming conflicts with Args
+        assert!(
+            !cmd.get_arguments().any(|x| x.get_id() == group.get_id()),
+            "Command {}: Argument group name '{}' must not conflict with argument name",
+            cmd.get_name(),
+            group.get_id(),
+        );
+
+        for arg in &group.args {
+            // Args listed inside groups should exist
+            assert!(
+                cmd.get_arguments().any(|x| x.get_id() == arg),
+                "Command {}: Argument group '{}' contains non-existent argument '{}'",
+                cmd.get_name(),
+                group.get_id(),
+                arg
+            );
+        }
+
+        for arg in &group.requires {
+            // Args listed inside groups should exist
+            assert!(
+                cmd.id_exists(arg),
+                "Command {}: Argument group '{}' requires non-existent '{}' id",
+                cmd.get_name(),
+                group.get_id(),
+                arg
+            );
+        }
+
+        for arg in &group.conflicts {
+            // Args listed inside groups should exist
+            assert!(
+                cmd.id_exists(arg),
+                "Command {}: Argument group '{}' conflicts with non-existent '{}' id",
+                cmd.get_name(),
+                group.get_id(),
+                arg
+            );
+        }
+    }
+
+    // Conflicts between flags and subcommands
+
+    long_flags.sort_unstable();
+    short_flags.sort_unstable();
+
+    detect_duplicate_flags(&long_flags, "long");
+    detect_duplicate_flags(&short_flags, "short");
+
+    let mut subs = FlatSet::new();
+    for sc in cmd.get_subcommands() {
+        assert!(
+            subs.insert(sc.get_name()),
+            "Command {}: command name `{}` is duplicated",
+            cmd.get_name(),
+            sc.get_name()
+        );
+        for alias in sc.get_all_aliases() {
+            assert!(
+                subs.insert(alias),
+                "Command {}: command `{}` alias `{}` is duplicated",
+                cmd.get_name(),
+                sc.get_name(),
+                alias
+            );
+        }
+    }
+
+    _verify_positionals(cmd);
+
+    #[cfg(feature = "help")]
+    if let Some(help_template) = cmd.get_help_template() {
+        assert!(
+            !help_template.to_string().contains("{flags}"),
+            "Command {}: {}",
+                    cmd.get_name(),
+            "`{flags}` template variable was removed in clap3, they are now included in `{options}`",
+        );
+        assert!(
+            !help_template.to_string().contains("{unified}"),
+            "Command {}: {}",
+            cmd.get_name(),
+            "`{unified}` template variable was removed in clap3, use `{options}` instead"
+        );
+        #[cfg(feature = "unstable-v5")]
+        assert!(
+            !help_template.to_string().contains("{bin}"),
+            "Command {}: {}",
+            cmd.get_name(),
+            "`{bin}` template variable was removed in clap5, use `{name}` instead"
+        )
+    }
+
+    cmd._panic_on_missing_help(cmd.is_help_expected_set());
+    assert_app_flags(cmd);
+}
+
+fn duplicate_tip(cmd: &Command, first: &Arg, second: &Arg) -> &'static str {
+    if !cmd.is_disable_help_flag_set()
+        && (first.get_id() == Id::HELP || second.get_id() == Id::HELP)
+    {
+        " (call `cmd.disable_help_flag(true)` to remove the auto-generated `--help`)"
+    } else if !cmd.is_disable_version_flag_set()
+        && (first.get_id() == Id::VERSION || second.get_id() == Id::VERSION)
+    {
+        " (call `cmd.disable_version_flag(true)` to remove the auto-generated `--version`)"
+    } else {
+        ""
+    }
+}
+
+#[derive(Eq)]
+enum Flag<'a> {
+    Command(String, &'a str),
+    Arg(String, &'a str),
+}
+
+impl PartialEq for Flag<'_> {
+    fn eq(&self, other: &Flag) -> bool {
+        self.cmp(other) == Ordering::Equal
+    }
+}
+
+impl PartialOrd for Flag<'_> {
+    fn partial_cmp(&self, other: &Flag) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for Flag<'_> {
+    fn cmp(&self, other: &Self) -> Ordering {
+        use Flag::*;
+
+        match (self, other) {
+            (Command(s1, _), Command(s2, _))
+            | (Arg(s1, _), Arg(s2, _))
+            | (Command(s1, _), Arg(s2, _))
+            | (Arg(s1, _), Command(s2, _)) => {
+                if s1 == s2 {
+                    Ordering::Equal
+                } else {
+                    s1.cmp(s2)
+                }
+            }
+        }
+    }
+}
+
+fn detect_duplicate_flags(flags: &[Flag], short_or_long: &str) {
+    use Flag::*;
+
+    for (one, two) in find_duplicates(flags) {
+        match (one, two) {
+            (Command(flag, one), Command(_, another)) if one != another => panic!(
+                "the '{flag}' {short_or_long} flag is specified for both '{one}' and '{another}' subcommands"
+            ),
+
+            (Arg(flag, one), Arg(_, another)) if one != another => panic!(
+                "{short_or_long} option names must be unique, but '{flag}' is in use by both '{one}' and '{another}'"
+            ),
+
+            (Arg(flag, arg), Command(_, sub)) | (Command(flag, sub), Arg(_, arg)) => panic!(
+                "the '{flag}' {short_or_long} flag for the '{arg}' argument conflicts with the short flag \
+                     for '{sub}' subcommand"
+            ),
+
+            _ => {}
+        }
+    }
+}
+
+/// Find duplicates in a sorted array.
+///
+/// The algorithm is simple: the array is sorted, duplicates
+/// must be placed next to each other, we can check only adjacent elements.
+fn find_duplicates<T: PartialEq>(slice: &[T]) -> impl Iterator<Item = (&T, &T)> {
+    slice.windows(2).filter_map(|w| {
+        if w[0] == w[1] {
+            Some((&w[0], &w[1]))
+        } else {
+            None
+        }
+    })
+}
+
+fn assert_app_flags(cmd: &Command) {
+    macro_rules! checker {
+        ($a:ident requires $($b:ident)|+) => {
+            if cmd.$a() {
+                let mut s = String::new();
+
+                $(
+                    if !cmd.$b() {
+                        use std::fmt::Write;
+                        write!(&mut s, "  AppSettings::{} is required when AppSettings::{} is set.\n", std::stringify!($b), std::stringify!($a)).unwrap();
+                    }
+                )+
+
+                if !s.is_empty() {
+                    panic!("{s}")
+                }
+            }
+        };
+        ($a:ident conflicts $($b:ident)|+) => {
+            if cmd.$a() {
+                let mut s = String::new();
+
+                $(
+                    if cmd.$b() {
+                        use std::fmt::Write;
+                        write!(&mut s, "  AppSettings::{} conflicts with AppSettings::{}.\n", std::stringify!($b), std::stringify!($a)).unwrap();
+                    }
+                )+
+
+                if !s.is_empty() {
+                    panic!("{}\n{}", cmd.get_name(), s)
+                }
+            }
+        };
+    }
+
+    checker!(is_multicall_set conflicts is_no_binary_name_set);
+}
+
+#[cfg(debug_assertions)]
+fn _verify_positionals(cmd: &Command) -> bool {
+    debug!("Command::_verify_positionals");
+    // Because you must wait until all arguments have been supplied, this is the first chance
+    // to make assertions on positional argument indexes
+    //
+    // First we verify that the index highest supplied index, is equal to the number of
+    // positional arguments to verify there are no gaps (i.e. supplying an index of 1 and 3
+    // but no 2)
+
+    let highest_idx = cmd
+        .get_keymap()
+        .keys()
+        .filter_map(|x| {
+            if let KeyType::Position(n) = x {
+                Some(*n)
+            } else {
+                None
+            }
+        })
+        .max()
+        .unwrap_or(0);
+
+    let num_p = cmd.get_keymap().keys().filter(|x| x.is_position()).count();
+
+    assert!(
+        highest_idx == num_p,
+        "Found positional argument whose index is {highest_idx} but there \
+             are only {num_p} positional arguments defined",
+    );
+
+    for arg in cmd.get_arguments() {
+        if arg.index.unwrap_or(0) == highest_idx {
+            assert!(
+                !arg.is_trailing_var_arg_set() || !arg.is_last_set(),
+                "{}:{}: `Arg::trailing_var_arg` and `Arg::last` cannot be used together",
+                cmd.get_name(),
+                arg.get_id()
+            );
+
+            if arg.is_trailing_var_arg_set() {
+                assert!(
+                    arg.is_multiple(),
+                    "{}:{}: `Arg::trailing_var_arg` must accept multiple values",
+                    cmd.get_name(),
+                    arg.get_id()
+                );
+            }
+        } else {
+            assert!(
+                !arg.is_trailing_var_arg_set(),
+                "{}:{}: `Arg::trailing_var_arg` can only apply to last positional",
+                cmd.get_name(),
+                arg.get_id()
+            );
+        }
+    }
+
+    // Next we verify that only the highest index has takes multiple arguments (if any)
+    let only_highest = |a: &Arg| a.is_multiple() && (a.get_index().unwrap_or(0) != highest_idx);
+    if cmd.get_positionals().any(only_highest) {
+        // First we make sure if there is a positional that allows multiple values
+        // the one before it (second to last) has one of these:
+        //  * a value terminator
+        //  * ArgSettings::Last
+        //  * The last arg is Required
+
+        // We can't pass the closure (it.next()) to the macro directly because each call to
+        // find() (iterator, not macro) gets called repeatedly.
+        let last = &cmd.get_keymap()[&KeyType::Position(highest_idx)];
+        let second_to_last = &cmd.get_keymap()[&KeyType::Position(highest_idx - 1)];
+
+        // Either the final positional is required
+        // Or the second to last has a terminator or .last(true) set
+        let ok = last.is_required_set()
+            || (second_to_last.terminator.is_some() || second_to_last.is_last_set())
+            || last.is_last_set();
+        assert!(
+            ok,
+            "Positional argument `{last}` *must* have `required(true)` or `last(true)` set \
+            because a prior positional argument (`{second_to_last}`) has `num_args(1..)`"
+        );
+
+        // We make sure if the second to last is Multiple the last is ArgSettings::Last
+        let ok = second_to_last.is_multiple() || last.is_last_set();
+        assert!(
+            ok,
+            "Only the last positional argument, or second to last positional \
+                 argument may be set to `.num_args(1..)`"
+        );
+
+        // Next we check how many have both Multiple and not a specific number of values set
+        let count = cmd
+            .get_positionals()
+            .filter(|p| {
+                p.is_multiple_values_set()
+                    && p.get_value_terminator().is_none()
+                    && !p.get_num_args().expect(INTERNAL_ERROR_MSG).is_fixed()
+            })
+            .count();
+        let ok = count <= 1
+            || (last.is_last_set()
+                && last.is_multiple()
+                && second_to_last.is_multiple()
+                && count == 2);
+        assert!(
+            ok,
+            "Only one positional argument with `.num_args(1..)` set is allowed per \
+                 command, unless the second one also has .last(true) set"
+        );
+    }
+
+    let mut found = false;
+
+    if cmd.is_allow_missing_positional_set() {
+        // Check that if a required positional argument is found, all positions with a lower
+        // index are also required.
+        let mut foundx2 = false;
+
+        for p in cmd.get_positionals() {
+            if foundx2 && !p.is_required_set() {
+                assert!(
+                    p.is_required_set(),
+                    "Found non-required positional argument with a lower \
+                         index than a required positional argument by two or more: {:?} \
+                         index {:?}",
+                    p.get_id(),
+                    p.get_index()
+                );
+            } else if p.is_required_set() && !p.is_last_set() {
+                // Args that .last(true) don't count since they can be required and have
+                // positionals with a lower index that aren't required
+                // Imagine: prog <req1> [opt1] -- <req2>
+                // Both of these are valid invocations:
+                //      $ prog r1 -- r2
+                //      $ prog r1 o1 -- r2
+                if found {
+                    foundx2 = true;
+                    continue;
+                }
+                found = true;
+                continue;
+            } else {
+                found = false;
+            }
+        }
+    } else {
+        // Check that if a required positional argument is found, all positions with a lower
+        // index are also required
+        for p in (1..=num_p).rev().filter_map(|n| cmd.get_keymap().get(&n)) {
+            if found {
+                assert!(
+                    p.is_required_set(),
+                    "Found non-required positional argument with a lower \
+                         index than a required positional argument: {:?} index {:?}",
+                    p.get_id(),
+                    p.get_index()
+                );
+            } else if p.is_required_set() && !p.is_last_set() {
+                // Args that .last(true) don't count since they can be required and have
+                // positionals with a lower index that aren't required
+                // Imagine: prog <req1> [opt1] -- <req2>
+                // Both of these are valid invocations:
+                //      $ prog r1 -- r2
+                //      $ prog r1 o1 -- r2
+                found = true;
+                continue;
+            }
+        }
+    }
+    assert!(
+        cmd.get_positionals().filter(|p| p.is_last_set()).count() < 2,
+        "Only one positional argument may have last(true) set. Found two."
+    );
+    if cmd
+        .get_positionals()
+        .any(|p| p.is_last_set() && p.is_required_set())
+        && cmd.has_subcommands()
+        && !cmd.is_subcommand_negates_reqs_set()
+    {
+        panic!(
+            "Having a required positional argument with .last(true) set *and* child \
+                 subcommands without setting SubcommandsNegateReqs isn't compatible."
+        );
+    }
+
+    true
+}
+
+fn assert_arg(arg: &Arg) {
+    debug!("Arg::_debug_asserts:{}", arg.get_id());
+
+    // Self conflict
+    // TODO: this check should be recursive
+    assert!(
+        !arg.blacklist.iter().any(|x| x == arg.get_id()),
+        "Argument '{}' cannot conflict with itself",
+        arg.get_id(),
+    );
+
+    assert_eq!(
+        arg.get_action().takes_values(),
+        arg.is_takes_value_set(),
+        "Argument `{}`'s selected action {:?} contradicts `takes_value`",
+        arg.get_id(),
+        arg.get_action()
+    );
+    if let Some(action_type_id) = arg.get_action().value_type_id() {
+        assert_eq!(
+            action_type_id,
+            arg.get_value_parser().type_id(),
+            "Argument `{}`'s selected action {:?} contradicts `value_parser` ({:?})",
+            arg.get_id(),
+            arg.get_action(),
+            arg.get_value_parser()
+        );
+    }
+
+    if arg.get_value_hint() != ValueHint::Unknown {
+        assert!(
+            arg.is_takes_value_set(),
+            "Argument '{}' has value hint but takes no value",
+            arg.get_id()
+        );
+
+        if arg.get_value_hint() == ValueHint::CommandWithArguments {
+            assert!(
+                arg.is_multiple_values_set(),
+                "Argument '{}' uses hint CommandWithArguments and must accept multiple values",
+                arg.get_id()
+            )
+        }
+    }
+
+    if arg.index.is_some() {
+        assert!(
+            arg.is_positional(),
+            "Argument '{}' is a positional argument and can't have short or long name versions",
+            arg.get_id()
+        );
+        assert!(
+            arg.is_takes_value_set(),
+            "Argument '{}` is positional and it must take a value but action is {:?}{}",
+            arg.get_id(),
+            arg.get_action(),
+            if arg.get_id() == Id::HELP {
+                " (`mut_arg` no longer works with implicit `--help`)"
+            } else if arg.get_id() == Id::VERSION {
+                " (`mut_arg` no longer works with implicit `--version`)"
+            } else {
+                ""
+            }
+        );
+    }
+
+    let num_vals = arg.get_num_args().expect(INTERNAL_ERROR_MSG);
+    // This can be the cause of later asserts, so put this first
+    if num_vals != ValueRange::EMPTY {
+        // HACK: Don't check for flags to make the derive easier
+        let num_val_names = arg.get_value_names().unwrap_or(&[]).len();
+        if num_vals.max_values() < num_val_names {
+            panic!(
+                "Argument {}: Too many value names ({}) compared to `num_args` ({})",
+                arg.get_id(),
+                num_val_names,
+                num_vals
+            );
+        }
+    }
+
+    assert_eq!(
+        num_vals.takes_values(),
+        arg.is_takes_value_set(),
+        "Argument {}: mismatch between `num_args` ({}) and `takes_value`",
+        arg.get_id(),
+        num_vals,
+    );
+    assert_eq!(
+        num_vals.is_multiple(),
+        arg.is_multiple_values_set(),
+        "Argument {}: mismatch between `num_args` ({}) and `multiple_values`",
+        arg.get_id(),
+        num_vals,
+    );
+
+    if 1 < num_vals.min_values() {
+        assert!(
+            !arg.is_require_equals_set(),
+            "Argument {}: cannot accept more than 1 arg (num_args={}) with require_equals",
+            arg.get_id(),
+            num_vals
+        );
+    }
+
+    if num_vals == ValueRange::SINGLE {
+        assert!(
+            !arg.is_multiple_values_set(),
+            "Argument {}: mismatch between `num_args` and `multiple_values`",
+            arg.get_id()
+        );
+    }
+
+    assert_arg_flags(arg);
+}
+
+fn assert_arg_flags(arg: &Arg) {
+    macro_rules! checker {
+        ($a:ident requires $($b:ident)|+) => {
+            if arg.$a() {
+                let mut s = String::new();
+
+                $(
+                    if !arg.$b() {
+                        use std::fmt::Write;
+                        write!(&mut s, "  Arg::{} is required when Arg::{} is set.\n", std::stringify!($b), std::stringify!($a)).unwrap();
+                    }
+                )+
+
+                if !s.is_empty() {
+                    panic!("Argument {:?}\n{}", arg.get_id(), s)
+                }
+            }
+        }
+    }
+
+    checker!(is_hide_possible_values_set requires is_takes_value_set);
+    checker!(is_allow_hyphen_values_set requires is_takes_value_set);
+    checker!(is_allow_negative_numbers_set requires is_takes_value_set);
+    checker!(is_require_equals_set requires is_takes_value_set);
+    checker!(is_last_set requires is_takes_value_set);
+    checker!(is_hide_default_value_set requires is_takes_value_set);
+    checker!(is_multiple_values_set requires is_takes_value_set);
+    checker!(is_ignore_case_set requires is_takes_value_set);
+}
diff --git a/vendor/clap_builder/src/builder/ext.rs b/vendor/clap_builder/src/builder/ext.rs
new file mode 100644
index 0000000..2fb0d96
--- /dev/null
+++ b/vendor/clap_builder/src/builder/ext.rs
@@ -0,0 +1,216 @@
+use crate::util::AnyValueId;
+use crate::util::FlatMap;
+
+#[derive(Default, Clone, Debug)]
+pub(crate) struct Extensions {
+    extensions: FlatMap<AnyValueId, BoxedExtension>,
+}
+
+impl Extensions {
+    #[allow(dead_code)]
+    pub(crate) fn get<T: Extension>(&self) -> Option<&T> {
+        let id = AnyValueId::of::<T>();
+        self.extensions.get(&id).map(|e| e.as_ref::<T>())
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn get_mut<T: Extension>(&mut self) -> Option<&mut T> {
+        let id = AnyValueId::of::<T>();
+        self.extensions.get_mut(&id).map(|e| e.as_mut::<T>())
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn get_or_insert_default<T: Extension + Default>(&mut self) -> &mut T {
+        let id = AnyValueId::of::<T>();
+        self.extensions
+            .entry(id)
+            .or_insert_with(|| BoxedExtension::new(T::default()))
+            .as_mut::<T>()
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn set<T: Extension + Into<BoxedEntry>>(&mut self, tagged: T) -> bool {
+        let BoxedEntry { id, value } = tagged.into();
+        self.extensions.insert(id, value).is_some()
+    }
+
+    #[allow(dead_code)]
+    pub(crate) fn remove<T: Extension>(&mut self) -> Option<Box<dyn Extension>> {
+        let id = AnyValueId::of::<T>();
+        self.extensions.remove(&id).map(BoxedExtension::into_inner)
+    }
+
+    pub(crate) fn update(&mut self, other: &Self) {
+        for (key, value) in other.extensions.iter() {
+            self.extensions.insert(*key, value.clone());
+        }
+    }
+}
+
+/// Supports conversion to `Any`. Traits to be extended by `impl_downcast!` must extend `Extension`.
+pub(crate) trait Extension: std::fmt::Debug + Send + Sync + 'static {
+    /// Convert `Box<dyn Trait>` (where `Trait: Extension`) to `Box<dyn Any>`.
+    ///
+    /// `Box<dyn Any>` can /// then be further `downcast` into
+    /// `Box<ConcreteType>` where `ConcreteType` implements `Trait`.
+    fn into_any(self: Box<Self>) -> Box<dyn std::any::Any>;
+    /// Clone `&Box<dyn Trait>` (where `Trait: Extension`) to `Box<dyn Extension>`.
+    ///
+    /// `Box<dyn Any>` can /// then be further `downcast` into
+    // `Box<ConcreteType>` where `ConcreteType` implements `Trait`.
+    fn clone_extension(&self) -> Box<dyn Extension>;
+    /// Convert `&Trait` (where `Trait: Extension`) to `&Any`.
+    ///
+    /// This is needed since Rust cannot /// generate `&Any`'s vtable from
+    /// `&Trait`'s.
+    fn as_any(&self) -> &dyn std::any::Any;
+    /// Convert `&mut Trait` (where `Trait: Extension`) to `&Any`.
+    ///
+    /// This is needed since Rust cannot /// generate `&mut Any`'s vtable from
+    /// `&mut Trait`'s.
+    fn as_any_mut(&mut self) -> &mut dyn std::any::Any;
+}
+
+impl<T> Extension for T
+where
+    T: Clone + std::fmt::Debug + Send + Sync + 'static,
+{
+    fn into_any(self: Box<Self>) -> Box<dyn std::any::Any> {
+        self
+    }
+    fn clone_extension(&self) -> Box<dyn Extension> {
+        Box::new(self.clone())
+    }
+    fn as_any(&self) -> &dyn std::any::Any {
+        self
+    }
+    fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
+        self
+    }
+}
+
+impl Clone for Box<dyn Extension> {
+    fn clone(&self) -> Self {
+        self.as_ref().clone_extension()
+    }
+}
+
+#[derive(Clone)]
+#[repr(transparent)]
+struct BoxedExtension(Box<dyn Extension>);
+
+impl BoxedExtension {
+    fn new<T: Extension>(inner: T) -> Self {
+        Self(Box::new(inner))
+    }
+
+    fn into_inner(self) -> Box<dyn Extension> {
+        self.0
+    }
+
+    fn as_ref<T: Extension>(&self) -> &T {
+        self.0.as_ref().as_any().downcast_ref::<T>().unwrap()
+    }
+
+    fn as_mut<T: Extension>(&mut self) -> &mut T {
+        self.0.as_mut().as_any_mut().downcast_mut::<T>().unwrap()
+    }
+}
+
+impl std::fmt::Debug for BoxedExtension {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+        self.0.fmt(f)
+    }
+}
+
+#[derive(Clone)]
+pub(crate) struct BoxedEntry {
+    id: AnyValueId,
+    value: BoxedExtension,
+}
+
+impl BoxedEntry {
+    pub(crate) fn new(r: impl Extension) -> Self {
+        let id = AnyValueId::from(&r);
+        let value = BoxedExtension::new(r);
+        BoxedEntry { id, value }
+    }
+}
+
+impl<R: Extension> From<R> for BoxedEntry {
+    fn from(inner: R) -> Self {
+        BoxedEntry::new(inner)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[derive(Default, Copy, Clone, Debug, PartialEq, Eq)]
+    struct Number(usize);
+
+    #[test]
+    fn get() {
+        let mut ext = Extensions::default();
+        ext.set(Number(10));
+        assert_eq!(ext.get::<Number>(), Some(&Number(10)));
+    }
+
+    #[test]
+    fn get_mut() {
+        let mut ext = Extensions::default();
+        ext.set(Number(10));
+        *ext.get_mut::<Number>().unwrap() = Number(20);
+        assert_eq!(ext.get::<Number>(), Some(&Number(20)));
+    }
+
+    #[test]
+    fn get_or_insert_default_empty() {
+        let mut ext = Extensions::default();
+        assert_eq!(ext.get_or_insert_default::<Number>(), &Number(0));
+    }
+
+    #[test]
+    fn get_or_insert_default_full() {
+        let mut ext = Extensions::default();
+        ext.set(Number(10));
+        assert_eq!(ext.get_or_insert_default::<Number>(), &Number(10));
+    }
+
+    #[test]
+    fn set() {
+        let mut ext = Extensions::default();
+        assert!(!ext.set(Number(10)));
+        assert_eq!(ext.get::<Number>(), Some(&Number(10)));
+        assert!(ext.set(Number(20)));
+        assert_eq!(ext.get::<Number>(), Some(&Number(20)));
+    }
+
+    #[test]
+    fn reset() {
+        let mut ext = Extensions::default();
+        assert_eq!(ext.get::<Number>(), None);
+
+        assert!(ext.remove::<Number>().is_none());
+        assert_eq!(ext.get::<Number>(), None);
+
+        assert!(!ext.set(Number(10)));
+        assert_eq!(ext.get::<Number>(), Some(&Number(10)));
+
+        assert!(ext.remove::<Number>().is_some());
+        assert_eq!(ext.get::<Number>(), None);
+    }
+
+    #[test]
+    fn update() {
+        let mut ext = Extensions::default();
+        assert_eq!(ext.get::<Number>(), None);
+
+        let mut new = Extensions::default();
+        assert!(!new.set(Number(10)));
+
+        ext.update(&new);
+        assert_eq!(ext.get::<Number>(), Some(&Number(10)));
+    }
+}
diff --git a/vendor/clap_builder/src/builder/mod.rs b/vendor/clap_builder/src/builder/mod.rs
new file mode 100644
index 0000000..320a453
--- /dev/null
+++ b/vendor/clap_builder/src/builder/mod.rs
@@ -0,0 +1,67 @@
+//! Define [`Command`] line [arguments][`Arg`]
+
+mod action;
+mod app_settings;
+mod arg;
+mod arg_group;
+mod arg_predicate;
+mod arg_settings;
+mod command;
+mod ext;
+mod os_str;
+mod possible_value;
+mod range;
+mod resettable;
+mod str;
+mod styled_str;
+mod value_hint;
+mod value_parser;
+
+#[cfg(debug_assertions)]
+mod debug_asserts;
+
+#[cfg(test)]
+mod tests;
+
+pub mod styling;
+
+pub use self::str::Str;
+pub use action::ArgAction;
+pub use arg::Arg;
+pub use arg_group::ArgGroup;
+pub use arg_predicate::ArgPredicate;
+pub use command::Command;
+pub use os_str::OsStr;
+pub use possible_value::PossibleValue;
+pub use range::ValueRange;
+pub use resettable::IntoResettable;
+pub use resettable::Resettable;
+pub use styled_str::StyledStr;
+pub use styling::Styles;
+pub use value_hint::ValueHint;
+pub use value_parser::_AutoValueParser;
+pub use value_parser::via_prelude;
+pub use value_parser::BoolValueParser;
+pub use value_parser::BoolishValueParser;
+pub use value_parser::EnumValueParser;
+pub use value_parser::FalseyValueParser;
+pub use value_parser::MapValueParser;
+pub use value_parser::NonEmptyStringValueParser;
+pub use value_parser::OsStringValueParser;
+pub use value_parser::PathBufValueParser;
+pub use value_parser::PossibleValuesParser;
+pub use value_parser::RangedI64ValueParser;
+pub use value_parser::RangedU64ValueParser;
+pub use value_parser::StringValueParser;
+pub use value_parser::TryMapValueParser;
+pub use value_parser::TypedValueParser;
+pub use value_parser::UnknownArgumentValueParser;
+pub use value_parser::ValueParser;
+pub use value_parser::ValueParserFactory;
+pub use value_parser::_AnonymousValueParser;
+
+#[allow(unused_imports)]
+pub(crate) use self::str::Inner as StrInner;
+pub(crate) use action::CountType;
+pub(crate) use arg_settings::{ArgFlags, ArgSettings};
+pub(crate) use command::AppTag;
diff --git a/vendor/clap_builder/src/builder/os_str.rs b/vendor/clap_builder/src/builder/os_str.rs
new file mode 100644
index 0000000..fe8928e
--- /dev/null
+++ b/vendor/clap_builder/src/builder/os_str.rs
@@ -0,0 +1,336 @@
+use crate::builder::Str;
+
+/// A UTF-8-encoded fixed string
+///
+/// **NOTE:** To support dynamic values (i.e. `OsString`), enable the `string`
+/// feature
+#[derive(Default, Clone, Eq, PartialEq, PartialOrd, Ord, Hash)]
+pub struct OsStr {
+    name: Inner,
+}
+
+impl OsStr {
+    #[cfg(feature = "string")]
+    pub(crate) fn from_string(name: std::ffi::OsString) -> Self {
+        Self {
+            name: Inner::from_string(name),
+        }
+    }
+
+    #[cfg(feature = "string")]
+    pub(crate) fn from_ref(name: &std::ffi::OsStr) -> Self {
+        Self {
+            name: Inner::from_ref(name),
+        }
+    }
+
+    pub(crate) fn from_static_ref(name: &'static std::ffi::OsStr) -> Self {
+        Self {
+            name: Inner::from_static_ref(name),
+        }
+    }
+
+    /// Get the raw string as an `std::ffi::OsStr`
+    pub fn as_os_str(&self) -> &std::ffi::OsStr {
+        self.name.as_os_str()
+    }
+
+    /// Get the raw string as an `OsString`
+    pub fn to_os_string(&self) -> std::ffi::OsString {
+        self.as_os_str().to_owned()
+    }
+}
+
+impl From<&'_ OsStr> for OsStr {
+    fn from(id: &'_ OsStr) -> Self {
+        id.clone()
+    }
+}
+
+#[cfg(feature = "string")]
+impl From<Str> for OsStr {
+    fn from(id: Str) -> Self {
+        match id.into_inner() {
+            crate::builder::StrInner::Static(s) => Self::from_static_ref(std::ffi::OsStr::new(s)),
+            crate::builder::StrInner::Owned(s) => Self::from_ref(std::ffi::OsStr::new(s.as_ref())),
+        }
+    }
+}
+
+#[cfg(not(feature = "string"))]
+impl From<Str> for OsStr {
+    fn from(id: Str) -> Self {
+        Self::from_static_ref(std::ffi::OsStr::new(id.into_inner().0))
+    }
+}
+
+#[cfg(feature = "perf")]
+impl From<&'_ Str> for OsStr {
+    fn from(id: &'_ Str) -> Self {
+        match id.clone().into_inner() {
+            crate::builder::StrInner::Static(s) => Self::from_static_ref(std::ffi::OsStr::new(s)),
+            crate::builder::StrInner::Owned(s) => Self::from_ref(std::ffi::OsStr::new(s.as_ref())),
+        }
+    }
+}
+
+impl From<&'_ Str> for OsStr {
+    fn from(id: &'_ Str) -> Self {
+        id.clone().into()
+    }
+}
+
+#[cfg(feature = "string")]
+impl From<std::ffi::OsString> for OsStr {
+    fn from(name: std::ffi::OsString) -> Self {
+        Self::from_string(name)
+    }
+}
+
+#[cfg(feature = "string")]
+impl From<&'_ std::ffi::OsString> for OsStr {
+    fn from(name: &'_ std::ffi::OsString) -> Self {
+        Self::from_ref(name.as_os_str())
+    }
+}
+
+#[cfg(feature = "string")]
+impl From<std::string::String> for OsStr {
+    fn from(name: std::string::String) -> Self {
+        Self::from_string(name.into())
+    }
+}
+
+#[cfg(feature = "string")]
+impl From<&'_ std::string::String> for OsStr {
+    fn from(name: &'_ std::string::String) -> Self {
+        Self::from_ref(name.as_str().as_ref())
+    }
+}
+
+impl From<&'static std::ffi::OsStr> for OsStr {
+    fn from(name: &'static std::ffi::OsStr) -> Self {
+        Self::from_static_ref(name)
+    }
+}
+
+impl From<&'_ &'static std::ffi::OsStr> for OsStr {
+    fn from(name: &'_ &'static std::ffi::OsStr) -> Self {
+        Self::from_static_ref(name)
+    }
+}
+
+impl From<&'static str> for OsStr {
+    fn from(name: &'static str) -> Self {
+        Self::from_static_ref(name.as_ref())
+    }
+}
+
+impl From<&'_ &'static str> for OsStr {
+    fn from(name: &'_ &'static str) -> Self {
+        Self::from_static_ref((*name).as_ref())
+    }
+}
+
+impl From<OsStr> for std::ffi::OsString {
+    fn from(name: OsStr) -> Self {
+        name.name.into_os_string()
+    }
+}
+
+impl From<OsStr> for std::path::PathBuf {
+    fn from(name: OsStr) -> Self {
+        std::ffi::OsString::from(name).into()
+    }
+}
+
+impl std::fmt::Debug for OsStr {
+    #[inline]
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Debug::fmt(self.as_os_str(), f)
+    }
+}
+
+impl std::ops::Deref for OsStr {
+    type Target = std::ffi::OsStr;
+
+    #[inline]
+    fn deref(&self) -> &std::ffi::OsStr {
+        self.as_os_str()
+    }
+}
+
+impl AsRef<std::ffi::OsStr> for OsStr {
+    #[inline]
+    fn as_ref(&self) -> &std::ffi::OsStr {
+        self.as_os_str()
+    }
+}
+
+impl AsRef<std::path::Path> for OsStr {
+    #[inline]
+    fn as_ref(&self) -> &std::path::Path {
+        std::path::Path::new(self)
+    }
+}
+
+impl std::borrow::Borrow<std::ffi::OsStr> for OsStr {
+    #[inline]
+    fn borrow(&self) -> &std::ffi::OsStr {
+        self.as_os_str()
+    }
+}
+
+impl PartialEq<str> for OsStr {
+    #[inline]
+    fn eq(&self, other: &str) -> bool {
+        PartialEq::eq(self.as_os_str(), other)
+    }
+}
+impl PartialEq<OsStr> for str {
+    #[inline]
+    fn eq(&self, other: &OsStr) -> bool {
+        PartialEq::eq(self, other.as_os_str())
+    }
+}
+
+impl PartialEq<&'_ str> for OsStr {
+    #[inline]
+    fn eq(&self, other: &&str) -> bool {
+        PartialEq::eq(self.as_os_str(), *other)
+    }
+}
+impl PartialEq<OsStr> for &'_ str {
+    #[inline]
+    fn eq(&self, other: &OsStr) -> bool {
+        PartialEq::eq(*self, other.as_os_str())
+    }
+}
+
+impl PartialEq<&'_ std::ffi::OsStr> for OsStr {
+    #[inline]
+    fn eq(&self, other: &&std::ffi::OsStr) -> bool {
+        PartialEq::eq(self.as_os_str(), *other)
+    }
+}
+impl PartialEq<OsStr> for &'_ std::ffi::OsStr {
+    #[inline]
+    fn eq(&self, other: &OsStr) -> bool {
+        PartialEq::eq(*self, other.as_os_str())
+    }
+}
+
+impl PartialEq<std::string::String> for OsStr {
+    #[inline]
+    fn eq(&self, other: &std::string::String) -> bool {
+        PartialEq::eq(self.as_os_str(), other.as_str())
+    }
+}
+impl PartialEq<OsStr> for std::string::String {
+    #[inline]
+    fn eq(&self, other: &OsStr) -> bool {
+        PartialEq::eq(self.as_str(), other.as_os_str())
+    }
+}
+
+impl PartialEq<std::ffi::OsString> for OsStr {
+    #[inline]
+    fn eq(&self, other: &std::ffi::OsString) -> bool {
+        PartialEq::eq(self.as_os_str(), other.as_os_str())
+    }
+}
+impl PartialEq<OsStr> for std::ffi::OsString {
+    #[inline]
+    fn eq(&self, other: &OsStr) -> bool {
+        PartialEq::eq(self.as_os_str(), other.as_os_str())
+    }
+}
+
+#[cfg(feature = "string")]
+pub(crate) mod inner {
+    #[derive(Clone)]
+    pub(crate) enum Inner {
+        Static(&'static std::ffi::OsStr),
+        Owned(Box<std::ffi::OsStr>),
+    }
+
+    impl Inner {
+        pub(crate) fn from_string(name: std::ffi::OsString) -> Self {
+            Self::Owned(name.into_boxed_os_str())
+        }
+
+        pub(crate) fn from_ref(name: &std::ffi::OsStr) -> Self {
+            Self::Owned(Box::from(name))
+        }
+
+        pub(crate) fn from_static_ref(name: &'static std::ffi::OsStr) -> Self {
+            Self::Static(name)
+        }
+
+        pub(crate) fn as_os_str(&self) -> &std::ffi::OsStr {
+            match self {
+                Self::Static(s) => s,
+                Self::Owned(s) => s.as_ref(),
+            }
+        }
+
+        pub(crate) fn into_os_string(self) -> std::ffi::OsString {
+            self.as_os_str().to_owned()
+        }
+    }
+}
+
+#[cfg(not(feature = "string"))]
+pub(crate) mod inner {
+    #[derive(Clone)]
+    pub(crate) struct Inner(&'static std::ffi::OsStr);
+
+    impl Inner {
+        pub(crate) fn from_static_ref(name: &'static std::ffi::OsStr) -> Self {
+            Self(name)
+        }
+
+        pub(crate) fn as_os_str(&self) -> &std::ffi::OsStr {
+            self.0
+        }
+
+        pub(crate) fn into_os_string(self) -> std::ffi::OsString {
+            self.as_os_str().to_owned()
+        }
+    }
+}
+
+pub(crate) use inner::Inner;
+
+impl Default for Inner {
+    fn default() -> Self {
+        Self::from_static_ref(std::ffi::OsStr::new(""))
+    }
+}
+
+impl PartialEq for Inner {
+    fn eq(&self, other: &Inner) -> bool {
+        self.as_os_str() == other.as_os_str()
+    }
+}
+
+impl PartialOrd for Inner {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for Inner {
+    fn cmp(&self, other: &Inner) -> std::cmp::Ordering {
+        self.as_os_str().cmp(other.as_os_str())
+    }
+}
+
+impl Eq for Inner {}
+
+impl std::hash::Hash for Inner {
+    #[inline]
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.as_os_str().hash(state);
+    }
+}
diff --git a/vendor/clap_builder/src/builder/possible_value.rs b/vendor/clap_builder/src/builder/possible_value.rs
new file mode 100644
index 0000000..de7e543
--- /dev/null
+++ b/vendor/clap_builder/src/builder/possible_value.rs
@@ -0,0 +1,229 @@
+use crate::builder::IntoResettable;
+use crate::builder::Str;
+use crate::builder::StyledStr;
+use crate::util::eq_ignore_case;
+
+/// A possible value of an argument.
+///
+/// This is used for specifying [possible values] of [Args].
+///
+/// See also [`PossibleValuesParser`][crate::builder::PossibleValuesParser]
+///
+/// **NOTE:** Most likely you can use strings, rather than `PossibleValue` as it is only required
+/// to [hide] single values from help messages and shell completions or to attach [help] to
+/// possible values.
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// # use clap::{Arg, builder::PossibleValue, ArgAction};
+/// let cfg = Arg::new("config")
+///     .action(ArgAction::Set)
+///     .value_name("FILE")
+///     .value_parser([
+///         PossibleValue::new("fast"),
+///         PossibleValue::new("slow").help("slower than fast"),
+///         PossibleValue::new("secret speed").hide(true)
+///     ]);
+/// ```
+///
+/// [Args]: crate::Arg
+/// [possible values]: crate::builder::ValueParser::possible_values
+/// [hide]: PossibleValue::hide()
+/// [help]: PossibleValue::help()
+#[derive(Debug, Default, Clone, PartialEq, Eq)]
+pub struct PossibleValue {
+    name: Str,
+    help: Option<StyledStr>,
+    aliases: Vec<Str>, // (name, visible)
+    hide: bool,
+}
+
+impl PossibleValue {
+    /// Create a [`PossibleValue`] with its name.
+    ///
+    /// The name will be used to decide whether this value was provided by the user to an argument.
+    ///
+    /// **NOTE:** In case it is not [hidden] it will also be shown in help messages for arguments
+    /// that use it as a [possible value] and have not hidden them through [`Arg::hide_possible_values(true)`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::builder::PossibleValue;
+    /// PossibleValue::new("fast")
+    /// # ;
+    /// ```
+    /// [hidden]: PossibleValue::hide
+    /// [possible value]: crate::builder::PossibleValuesParser
+    /// [`Arg::hide_possible_values(true)`]: crate::Arg::hide_possible_values()
+    pub fn new(name: impl Into<Str>) -> Self {
+        PossibleValue {
+            name: name.into(),
+            ..Default::default()
+        }
+    }
+
+    /// Sets the help description of the value.
+    ///
+    /// This is typically displayed in completions (where supported) and should be a short, one-line
+    /// description.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::builder::PossibleValue;
+    /// PossibleValue::new("slow")
+    ///     .help("not fast")
+    /// # ;
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn help(mut self, help: impl IntoResettable<StyledStr>) -> Self {
+        self.help = help.into_resettable().into_option();
+        self
+    }
+
+    /// Hides this value from help and shell completions.
+    ///
+    /// This is an alternative to hiding through [`Arg::hide_possible_values(true)`], if you only
+    /// want to hide some values.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::builder::PossibleValue;
+    /// PossibleValue::new("secret")
+    ///     .hide(true)
+    /// # ;
+    /// ```
+    /// [`Arg::hide_possible_values(true)`]: crate::Arg::hide_possible_values()
+    #[inline]
+    #[must_use]
+    pub fn hide(mut self, yes: bool) -> Self {
+        self.hide = yes;
+        self
+    }
+
+    /// Sets a *hidden* alias for this argument value.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::builder::PossibleValue;
+    /// PossibleValue::new("slow")
+    ///     .alias("not-fast")
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn alias(mut self, name: impl IntoResettable<Str>) -> Self {
+        if let Some(name) = name.into_resettable().into_option() {
+            self.aliases.push(name);
+        } else {
+            self.aliases.clear();
+        }
+        self
+    }
+
+    /// Sets multiple *hidden* aliases for this argument value.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::builder::PossibleValue;
+    /// PossibleValue::new("slow")
+    ///     .aliases(["not-fast", "snake-like"])
+    /// # ;
+    /// ```
+    #[must_use]
+    pub fn aliases(mut self, names: impl IntoIterator<Item = impl Into<Str>>) -> Self {
+        self.aliases.extend(names.into_iter().map(|a| a.into()));
+        self
+    }
+}
+
+/// Reflection
+impl PossibleValue {
+    /// Get the name of the argument value
+    #[inline]
+    pub fn get_name(&self) -> &str {
+        self.name.as_str()
+    }
+
+    /// Get the help specified for this argument, if any
+    #[inline]
+    pub fn get_help(&self) -> Option<&StyledStr> {
+        self.help.as_ref()
+    }
+
+    /// Report if [`PossibleValue::hide`] is set
+    #[inline]
+    pub fn is_hide_set(&self) -> bool {
+        self.hide
+    }
+
+    /// Report if PossibleValue is not hidden and has a help message
+    pub(crate) fn should_show_help(&self) -> bool {
+        !self.hide && self.help.is_some()
+    }
+
+    /// Get the name if argument value is not hidden, `None` otherwise,
+    /// but wrapped in quotes if it contains whitespace
+    #[cfg(feature = "help")]
+    pub(crate) fn get_visible_quoted_name(&self) -> Option<std::borrow::Cow<'_, str>> {
+        if !self.hide {
+            Some(if self.name.contains(char::is_whitespace) {
+                format!("{:?}", self.name).into()
+            } else {
+                self.name.as_str().into()
+            })
+        } else {
+            None
+        }
+    }
+
+    /// Returns all valid values of the argument value.
+    ///
+    /// Namely the name and all aliases.
+    pub fn get_name_and_aliases(&self) -> impl Iterator<Item = &str> + '_ {
+        std::iter::once(self.get_name()).chain(self.aliases.iter().map(|s| s.as_str()))
+    }
+
+    /// Tests if the value is valid for this argument value
+    ///
+    /// The value is valid if it is either the name or one of the aliases.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::builder::PossibleValue;
+    /// let arg_value = PossibleValue::new("fast").alias("not-slow");
+    ///
+    /// assert!(arg_value.matches("fast", false));
+    /// assert!(arg_value.matches("not-slow", false));
+    ///
+    /// assert!(arg_value.matches("FAST", true));
+    /// assert!(!arg_value.matches("FAST", false));
+    /// ```
+    pub fn matches(&self, value: &str, ignore_case: bool) -> bool {
+        if ignore_case {
+            self.get_name_and_aliases()
+                .any(|name| eq_ignore_case(name, value))
+        } else {
+            self.get_name_and_aliases().any(|name| name == value)
+        }
+    }
+}
+
+impl<S: Into<Str>> From<S> for PossibleValue {
+    fn from(s: S) -> Self {
+        Self::new(s)
+    }
+}
diff --git a/vendor/clap_builder/src/builder/range.rs b/vendor/clap_builder/src/builder/range.rs
new file mode 100644
index 0000000..158d02c
--- /dev/null
+++ b/vendor/clap_builder/src/builder/range.rs
@@ -0,0 +1,286 @@
+/// Values per occurrence for an argument
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
+pub struct ValueRange {
+    start_inclusive: usize,
+    end_inclusive: usize,
+}
+
+impl ValueRange {
+    /// Nor argument values, or a flag
+    pub const EMPTY: Self = Self {
+        start_inclusive: 0,
+        end_inclusive: 0,
+    };
+
+    /// A single argument value, the most common case for options
+    pub const SINGLE: Self = Self {
+        start_inclusive: 1,
+        end_inclusive: 1,
+    };
+
+    /// Create a range
+    ///
+    /// # Panics
+    ///
+    /// If the end is less than the start (debug builds)
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::builder::ValueRange;
+    /// let range = ValueRange::new(5);
+    /// let range = ValueRange::new(5..10);
+    /// let range = ValueRange::new(5..=10);
+    /// let range = ValueRange::new(5..);
+    /// let range = ValueRange::new(..10);
+    /// let range = ValueRange::new(..=10);
+    /// ```
+    ///
+    /// While this will panic:
+    /// ```should_panic
+    /// # use clap_builder as clap;
+    /// # use clap::builder::ValueRange;
+    /// let range = ValueRange::new(10..5);  // Panics!
+    /// ```
+    pub fn new(range: impl Into<Self>) -> Self {
+        range.into()
+    }
+
+    pub(crate) fn raw(start_inclusive: usize, end_inclusive: usize) -> Self {
+        debug_assert!(start_inclusive <= end_inclusive);
+        Self {
+            start_inclusive,
+            end_inclusive,
+        }
+    }
+
+    /// Fewest number of values the argument accepts
+    pub fn min_values(&self) -> usize {
+        self.start_inclusive
+    }
+
+    /// Most number of values the argument accepts
+    pub fn max_values(&self) -> usize {
+        self.end_inclusive
+    }
+
+    /// Report whether the argument takes any values (ie is a flag)
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::builder::ValueRange;
+    /// let range = ValueRange::new(5);
+    /// assert!(range.takes_values());
+    ///
+    /// let range = ValueRange::new(0);
+    /// assert!(!range.takes_values());
+    /// ```
+    pub fn takes_values(&self) -> bool {
+        self.end_inclusive != 0
+    }
+
+    pub(crate) fn is_unbounded(&self) -> bool {
+        self.end_inclusive == usize::MAX
+    }
+
+    pub(crate) fn is_fixed(&self) -> bool {
+        self.start_inclusive == self.end_inclusive
+    }
+
+    pub(crate) fn is_multiple(&self) -> bool {
+        self.start_inclusive != self.end_inclusive || 1 < self.start_inclusive
+    }
+
+    pub(crate) fn num_values(&self) -> Option<usize> {
+        self.is_fixed().then_some(self.start_inclusive)
+    }
+
+    pub(crate) fn accepts_more(&self, current: usize) -> bool {
+        current < self.end_inclusive
+    }
+}
+
+impl std::ops::RangeBounds<usize> for ValueRange {
+    fn start_bound(&self) -> std::ops::Bound<&usize> {
+        std::ops::Bound::Included(&self.start_inclusive)
+    }
+
+    fn end_bound(&self) -> std::ops::Bound<&usize> {
+        std::ops::Bound::Included(&self.end_inclusive)
+    }
+}
+
+impl Default for ValueRange {
+    fn default() -> Self {
+        Self::SINGLE
+    }
+}
+
+impl From<usize> for ValueRange {
+    fn from(fixed: usize) -> Self {
+        (fixed..=fixed).into()
+    }
+}
+
+impl From<std::ops::Range<usize>> for ValueRange {
+    fn from(range: std::ops::Range<usize>) -> Self {
+        let start_inclusive = range.start;
+        let end_inclusive = range.end.saturating_sub(1);
+        Self::raw(start_inclusive, end_inclusive)
+    }
+}
+
+impl From<std::ops::RangeFull> for ValueRange {
+    fn from(_: std::ops::RangeFull) -> Self {
+        let start_inclusive = 0;
+        let end_inclusive = usize::MAX;
+        Self::raw(start_inclusive, end_inclusive)
+    }
+}
+
+impl From<std::ops::RangeFrom<usize>> for ValueRange {
+    fn from(range: std::ops::RangeFrom<usize>) -> Self {
+        let start_inclusive = range.start;
+        let end_inclusive = usize::MAX;
+        Self::raw(start_inclusive, end_inclusive)
+    }
+}
+
+impl From<std::ops::RangeTo<usize>> for ValueRange {
+    fn from(range: std::ops::RangeTo<usize>) -> Self {
+        let start_inclusive = 0;
+        let end_inclusive = range.end.saturating_sub(1);
+        Self::raw(start_inclusive, end_inclusive)
+    }
+}
+
+impl From<std::ops::RangeInclusive<usize>> for ValueRange {
+    fn from(range: std::ops::RangeInclusive<usize>) -> Self {
+        let start_inclusive = *range.start();
+        let end_inclusive = *range.end();
+        Self::raw(start_inclusive, end_inclusive)
+    }
+}
+
+impl From<std::ops::RangeToInclusive<usize>> for ValueRange {
+    fn from(range: std::ops::RangeToInclusive<usize>) -> Self {
+        let start_inclusive = 0;
+        let end_inclusive = range.end;
+        Self::raw(start_inclusive, end_inclusive)
+    }
+}
+
+impl std::fmt::Display for ValueRange {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        ok!(self.start_inclusive.fmt(f));
+        if !self.is_fixed() {
+            ok!("..=".fmt(f));
+            ok!(self.end_inclusive.fmt(f));
+        }
+        Ok(())
+    }
+}
+
+impl std::fmt::Debug for ValueRange {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(f, "{self}")
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    use std::ops::RangeBounds;
+
+    #[test]
+    fn from_fixed() {
+        let range: ValueRange = 5.into();
+        assert_eq!(range.start_bound(), std::ops::Bound::Included(&5));
+        assert_eq!(range.end_bound(), std::ops::Bound::Included(&5));
+        assert!(range.is_fixed());
+        assert!(range.is_multiple());
+        assert_eq!(range.num_values(), Some(5));
+        assert!(range.takes_values());
+    }
+
+    #[test]
+    fn from_fixed_empty() {
+        let range: ValueRange = 0.into();
+        assert_eq!(range.start_bound(), std::ops::Bound::Included(&0));
+        assert_eq!(range.end_bound(), std::ops::Bound::Included(&0));
+        assert!(range.is_fixed());
+        assert!(!range.is_multiple());
+        assert_eq!(range.num_values(), Some(0));
+        assert!(!range.takes_values());
+    }
+
+    #[test]
+    fn from_range() {
+        let range: ValueRange = (5..10).into();
+        assert_eq!(range.start_bound(), std::ops::Bound::Included(&5));
+        assert_eq!(range.end_bound(), std::ops::Bound::Included(&9));
+        assert!(!range.is_fixed());
+        assert!(range.is_multiple());
+        assert_eq!(range.num_values(), None);
+        assert!(range.takes_values());
+    }
+
+    #[test]
+    fn from_range_inclusive() {
+        let range: ValueRange = (5..=10).into();
+        assert_eq!(range.start_bound(), std::ops::Bound::Included(&5));
+        assert_eq!(range.end_bound(), std::ops::Bound::Included(&10));
+        assert!(!range.is_fixed());
+        assert!(range.is_multiple());
+        assert_eq!(range.num_values(), None);
+        assert!(range.takes_values());
+    }
+
+    #[test]
+    fn from_range_full() {
+        let range: ValueRange = (..).into();
+        assert_eq!(range.start_bound(), std::ops::Bound::Included(&0));
+        assert_eq!(range.end_bound(), std::ops::Bound::Included(&usize::MAX));
+        assert!(!range.is_fixed());
+        assert!(range.is_multiple());
+        assert_eq!(range.num_values(), None);
+        assert!(range.takes_values());
+    }
+
+    #[test]
+    fn from_range_from() {
+        let range: ValueRange = (5..).into();
+        assert_eq!(range.start_bound(), std::ops::Bound::Included(&5));
+        assert_eq!(range.end_bound(), std::ops::Bound::Included(&usize::MAX));
+        assert!(!range.is_fixed());
+        assert!(range.is_multiple());
+        assert_eq!(range.num_values(), None);
+        assert!(range.takes_values());
+    }
+
+    #[test]
+    fn from_range_to() {
+        let range: ValueRange = (..10).into();
+        assert_eq!(range.start_bound(), std::ops::Bound::Included(&0));
+        assert_eq!(range.end_bound(), std::ops::Bound::Included(&9));
+        assert!(!range.is_fixed());
+        assert!(range.is_multiple());
+        assert_eq!(range.num_values(), None);
+        assert!(range.takes_values());
+    }
+
+    #[test]
+    fn from_range_to_inclusive() {
+        let range: ValueRange = (..=10).into();
+        assert_eq!(range.start_bound(), std::ops::Bound::Included(&0));
+        assert_eq!(range.end_bound(), std::ops::Bound::Included(&10));
+        assert!(!range.is_fixed());
+        assert!(range.is_multiple());
+        assert_eq!(range.num_values(), None);
+        assert!(range.takes_values());
+    }
+}
diff --git a/vendor/clap_builder/src/builder/resettable.rs b/vendor/clap_builder/src/builder/resettable.rs
new file mode 100644
index 0000000..0572740
--- /dev/null
+++ b/vendor/clap_builder/src/builder/resettable.rs
@@ -0,0 +1,212 @@
+// Unlike `impl Into<Option<T>>` or `Option<impl Into<T>>`, this isn't ambiguous for the `None`
+// case.
+
+use crate::builder::ArgAction;
+use crate::builder::OsStr;
+use crate::builder::Str;
+use crate::builder::StyledStr;
+use crate::builder::ValueHint;
+use crate::builder::ValueParser;
+use crate::builder::ValueRange;
+
+/// Clearable builder value
+///
+/// This allows a builder function to both accept any value that can [`Into::into`] `T` (like
+/// `&str` into `OsStr`) as well as `None` to reset it to the default.  This is needed to
+/// workaround a limitation where you can't have a function argument that is `impl Into<Option<T>>`
+/// where `T` is `impl Into<S>` accept `None` as its type is ambiguous.
+///
+/// # Example
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// # use clap::Command;
+/// # use clap::Arg;
+/// fn common() -> Command {
+///     Command::new("cli")
+///         .arg(Arg::new("input").short('i').long("input"))
+/// }
+/// let mut command = common();
+/// command.mut_arg("input", |arg| arg.short(None));
+/// ```
+#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum Resettable<T> {
+    /// Overwrite builder value
+    Value(T),
+    /// Reset builder value
+    Reset,
+}
+
+impl<T> Resettable<T> {
+    pub(crate) fn into_option(self) -> Option<T> {
+        match self {
+            Self::Value(t) => Some(t),
+            Self::Reset => None,
+        }
+    }
+}
+
+impl<T> From<T> for Resettable<T> {
+    fn from(other: T) -> Self {
+        Self::Value(other)
+    }
+}
+
+impl<T> From<Option<T>> for Resettable<T> {
+    fn from(other: Option<T>) -> Self {
+        match other {
+            Some(inner) => Self::Value(inner),
+            None => Self::Reset,
+        }
+    }
+}
+
+/// Convert to the intended resettable type
+pub trait IntoResettable<T> {
+    /// Convert to the intended resettable type
+    fn into_resettable(self) -> Resettable<T>;
+}
+
+impl IntoResettable<char> for Option<char> {
+    fn into_resettable(self) -> Resettable<char> {
+        match self {
+            Some(s) => Resettable::Value(s),
+            None => Resettable::Reset,
+        }
+    }
+}
+
+impl IntoResettable<usize> for Option<usize> {
+    fn into_resettable(self) -> Resettable<usize> {
+        match self {
+            Some(s) => Resettable::Value(s),
+            None => Resettable::Reset,
+        }
+    }
+}
+
+impl IntoResettable<ArgAction> for Option<ArgAction> {
+    fn into_resettable(self) -> Resettable<ArgAction> {
+        match self {
+            Some(s) => Resettable::Value(s),
+            None => Resettable::Reset,
+        }
+    }
+}
+
+impl IntoResettable<ValueHint> for Option<ValueHint> {
+    fn into_resettable(self) -> Resettable<ValueHint> {
+        match self {
+            Some(s) => Resettable::Value(s),
+            None => Resettable::Reset,
+        }
+    }
+}
+
+impl IntoResettable<ValueParser> for Option<ValueParser> {
+    fn into_resettable(self) -> Resettable<ValueParser> {
+        match self {
+            Some(s) => Resettable::Value(s),
+            None => Resettable::Reset,
+        }
+    }
+}
+
+impl IntoResettable<StyledStr> for Option<&'static str> {
+    fn into_resettable(self) -> Resettable<StyledStr> {
+        match self {
+            Some(s) => Resettable::Value(s.into()),
+            None => Resettable::Reset,
+        }
+    }
+}
+
+impl IntoResettable<OsStr> for Option<&'static str> {
+    fn into_resettable(self) -> Resettable<OsStr> {
+        match self {
+            Some(s) => Resettable::Value(s.into()),
+            None => Resettable::Reset,
+        }
+    }
+}
+
+impl IntoResettable<Str> for Option<&'static str> {
+    fn into_resettable(self) -> Resettable<Str> {
+        match self {
+            Some(s) => Resettable::Value(s.into()),
+            None => Resettable::Reset,
+        }
+    }
+}
+
+impl<T> IntoResettable<T> for Resettable<T> {
+    fn into_resettable(self) -> Resettable<T> {
+        self
+    }
+}
+
+impl IntoResettable<char> for char {
+    fn into_resettable(self) -> Resettable<char> {
+        Resettable::Value(self)
+    }
+}
+
+impl IntoResettable<usize> for usize {
+    fn into_resettable(self) -> Resettable<usize> {
+        Resettable::Value(self)
+    }
+}
+
+impl IntoResettable<ArgAction> for ArgAction {
+    fn into_resettable(self) -> Resettable<ArgAction> {
+        Resettable::Value(self)
+    }
+}
+
+impl IntoResettable<ValueHint> for ValueHint {
+    fn into_resettable(self) -> Resettable<ValueHint> {
+        Resettable::Value(self)
+    }
+}
+
+impl<I: Into<ValueRange>> IntoResettable<ValueRange> for I {
+    fn into_resettable(self) -> Resettable<ValueRange> {
+        Resettable::Value(self.into())
+    }
+}
+
+impl<I: Into<ValueParser>> IntoResettable<ValueParser> for I {
+    fn into_resettable(self) -> Resettable<ValueParser> {
+        Resettable::Value(self.into())
+    }
+}
+
+impl<I: Into<String>> IntoResettable<String> for I {
+    fn into_resettable(self) -> Resettable<String> {
+        Resettable::Value(self.into())
+    }
+}
+
+impl<I: Into<StyledStr>> IntoResettable<StyledStr> for I {
+    fn into_resettable(self) -> Resettable<StyledStr> {
+        Resettable::Value(self.into())
+    }
+}
+
+impl<I: Into<OsStr>> IntoResettable<OsStr> for I {
+    fn into_resettable(self) -> Resettable<OsStr> {
+        Resettable::Value(self.into())
+    }
+}
+
+impl<I: Into<Str>> IntoResettable<Str> for I {
+    fn into_resettable(self) -> Resettable<Str> {
+        Resettable::Value(self.into())
+    }
+}
+
+impl<I: Into<crate::Id>> IntoResettable<crate::Id> for I {
+    fn into_resettable(self) -> Resettable<crate::Id> {
+        Resettable::Value(self.into())
+    }
+}
diff --git a/vendor/clap_builder/src/builder/str.rs b/vendor/clap_builder/src/builder/str.rs
new file mode 100644
index 0000000..cf87691
--- /dev/null
+++ b/vendor/clap_builder/src/builder/str.rs
@@ -0,0 +1,310 @@
+/// A UTF-8-encoded fixed string
+///
+/// **NOTE:** To support dynamic values (i.e. `String`), enable the `string`
+/// feature
+#[derive(Default, Clone, Eq, PartialEq, PartialOrd, Ord, Hash)]
+pub struct Str {
+    name: Inner,
+}
+
+impl Str {
+    #[cfg(feature = "string")]
+    pub(crate) fn from_string(name: std::string::String) -> Self {
+        Self {
+            name: Inner::from_string(name),
+        }
+    }
+
+    #[cfg(feature = "string")]
+    pub(crate) fn from_ref(name: &str) -> Self {
+        Self {
+            name: Inner::from_ref(name),
+        }
+    }
+
+    pub(crate) fn from_static_ref(name: &'static str) -> Self {
+        Self {
+            name: Inner::from_static_ref(name),
+        }
+    }
+
+    pub(crate) fn into_inner(self) -> Inner {
+        self.name
+    }
+
+    /// Get the raw string of the `Str`
+    pub fn as_str(&self) -> &str {
+        self.name.as_str()
+    }
+}
+
+impl From<&'_ Str> for Str {
+    fn from(id: &'_ Str) -> Self {
+        id.clone()
+    }
+}
+
+#[cfg(feature = "string")]
+impl From<std::string::String> for Str {
+    fn from(name: std::string::String) -> Self {
+        Self::from_string(name)
+    }
+}
+
+#[cfg(feature = "string")]
+impl From<&'_ std::string::String> for Str {
+    fn from(name: &'_ std::string::String) -> Self {
+        Self::from_ref(name.as_str())
+    }
+}
+
+impl From<&'static str> for Str {
+    fn from(name: &'static str) -> Self {
+        Self::from_static_ref(name)
+    }
+}
+
+impl From<&'_ &'static str> for Str {
+    fn from(name: &'_ &'static str) -> Self {
+        Self::from_static_ref(name)
+    }
+}
+
+impl From<Str> for String {
+    fn from(name: Str) -> Self {
+        name.name.into_string()
+    }
+}
+
+impl From<Str> for Vec<u8> {
+    fn from(name: Str) -> Self {
+        String::from(name).into()
+    }
+}
+
+impl From<Str> for std::ffi::OsString {
+    fn from(name: Str) -> Self {
+        String::from(name).into()
+    }
+}
+
+impl From<Str> for std::path::PathBuf {
+    fn from(name: Str) -> Self {
+        String::from(name).into()
+    }
+}
+
+impl std::fmt::Display for Str {
+    #[inline]
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Display::fmt(self.as_str(), f)
+    }
+}
+
+impl std::fmt::Debug for Str {
+    #[inline]
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Debug::fmt(self.as_str(), f)
+    }
+}
+
+impl std::ops::Deref for Str {
+    type Target = str;
+
+    #[inline]
+    fn deref(&self) -> &str {
+        self.as_str()
+    }
+}
+
+impl AsRef<str> for Str {
+    #[inline]
+    fn as_ref(&self) -> &str {
+        self.as_str()
+    }
+}
+
+impl AsRef<[u8]> for Str {
+    #[inline]
+    fn as_ref(&self) -> &[u8] {
+        self.as_bytes()
+    }
+}
+
+impl AsRef<std::ffi::OsStr> for Str {
+    #[inline]
+    fn as_ref(&self) -> &std::ffi::OsStr {
+        (**self).as_ref()
+    }
+}
+
+impl AsRef<std::path::Path> for Str {
+    #[inline]
+    fn as_ref(&self) -> &std::path::Path {
+        std::path::Path::new(self)
+    }
+}
+
+impl std::borrow::Borrow<str> for Str {
+    #[inline]
+    fn borrow(&self) -> &str {
+        self.as_str()
+    }
+}
+
+impl PartialEq<str> for Str {
+    #[inline]
+    fn eq(&self, other: &str) -> bool {
+        PartialEq::eq(self.as_str(), other)
+    }
+}
+impl PartialEq<Str> for str {
+    #[inline]
+    fn eq(&self, other: &Str) -> bool {
+        PartialEq::eq(self, other.as_str())
+    }
+}
+
+impl PartialEq<&'_ str> for Str {
+    #[inline]
+    fn eq(&self, other: &&str) -> bool {
+        PartialEq::eq(self.as_str(), *other)
+    }
+}
+impl PartialEq<Str> for &'_ str {
+    #[inline]
+    fn eq(&self, other: &Str) -> bool {
+        PartialEq::eq(*self, other.as_str())
+    }
+}
+
+impl PartialEq<std::ffi::OsStr> for Str {
+    #[inline]
+    fn eq(&self, other: &std::ffi::OsStr) -> bool {
+        PartialEq::eq(self.as_str(), other)
+    }
+}
+impl PartialEq<Str> for std::ffi::OsStr {
+    #[inline]
+    fn eq(&self, other: &Str) -> bool {
+        PartialEq::eq(self, other.as_str())
+    }
+}
+
+impl PartialEq<&'_ std::ffi::OsStr> for Str {
+    #[inline]
+    fn eq(&self, other: &&std::ffi::OsStr) -> bool {
+        PartialEq::eq(self.as_str(), *other)
+    }
+}
+impl PartialEq<Str> for &'_ std::ffi::OsStr {
+    #[inline]
+    fn eq(&self, other: &Str) -> bool {
+        PartialEq::eq(*self, other.as_str())
+    }
+}
+
+impl PartialEq<std::string::String> for Str {
+    #[inline]
+    fn eq(&self, other: &std::string::String) -> bool {
+        PartialEq::eq(self.as_str(), other.as_str())
+    }
+}
+impl PartialEq<Str> for std::string::String {
+    #[inline]
+    fn eq(&self, other: &Str) -> bool {
+        PartialEq::eq(self.as_str(), other.as_str())
+    }
+}
+
+#[cfg(feature = "string")]
+pub(crate) mod inner {
+    #[derive(Clone)]
+    pub(crate) enum Inner {
+        Static(&'static str),
+        Owned(Box<str>),
+    }
+
+    impl Inner {
+        pub(crate) fn from_string(name: std::string::String) -> Self {
+            Self::Owned(name.into_boxed_str())
+        }
+
+        pub(crate) fn from_ref(name: &str) -> Self {
+            Self::Owned(Box::from(name))
+        }
+
+        pub(crate) fn from_static_ref(name: &'static str) -> Self {
+            Self::Static(name)
+        }
+
+        pub(crate) fn as_str(&self) -> &str {
+            match self {
+                Self::Static(s) => s,
+                Self::Owned(s) => s.as_ref(),
+            }
+        }
+
+        pub(crate) fn into_string(self) -> String {
+            match self {
+                Self::Static(s) => s.to_owned(),
+                Self::Owned(s) => s.into(),
+            }
+        }
+    }
+}
+
+#[cfg(not(feature = "string"))]
+pub(crate) mod inner {
+    #[derive(Clone)]
+    pub(crate) struct Inner(pub(crate) &'static str);
+
+    impl Inner {
+        pub(crate) fn from_static_ref(name: &'static str) -> Self {
+            Self(name)
+        }
+
+        pub(crate) fn as_str(&self) -> &str {
+            self.0
+        }
+
+        pub(crate) fn into_string(self) -> String {
+            self.as_str().to_owned()
+        }
+    }
+}
+
+pub(crate) use inner::Inner;
+
+impl Default for Inner {
+    fn default() -> Self {
+        Self::from_static_ref("")
+    }
+}
+
+impl PartialEq for Inner {
+    fn eq(&self, other: &Inner) -> bool {
+        self.as_str() == other.as_str()
+    }
+}
+
+impl PartialOrd for Inner {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for Inner {
+    fn cmp(&self, other: &Inner) -> std::cmp::Ordering {
+        self.as_str().cmp(other.as_str())
+    }
+}
+
+impl Eq for Inner {}
+
+impl std::hash::Hash for Inner {
+    #[inline]
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.as_str().hash(state);
+    }
+}
diff --git a/vendor/clap_builder/src/builder/styled_str.rs b/vendor/clap_builder/src/builder/styled_str.rs
new file mode 100644
index 0000000..e06ddbc
--- /dev/null
+++ b/vendor/clap_builder/src/builder/styled_str.rs
@@ -0,0 +1,210 @@
+#![cfg_attr(not(feature = "usage"), allow(dead_code))]
+
+/// Terminal-styling container
+///
+/// Styling may be encoded as [ANSI Escape Code](https://en.wikipedia.org/wiki/ANSI_escape_code)
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// // `cstr!` converts tags to ANSI codes
+/// let after_help: &'static str = color_print::cstr!(
+/// r#"<bold><underline>Examples</underline></bold>
+///
+///   <dim>$</dim> <bold>mybin --input file.toml</bold>
+/// "#);
+///
+/// let cmd = clap::Command::new("mybin")
+///     .after_help(after_help)  // The `&str` gets converted into a `StyledStr`
+///     // ...
+/// #   ;
+/// ```
+#[derive(Clone, Default, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct StyledStr(String);
+
+impl StyledStr {
+    /// Create an empty buffer
+    pub const fn new() -> Self {
+        Self(String::new())
+    }
+
+    /// Display using [ANSI Escape Code](https://en.wikipedia.org/wiki/ANSI_escape_code) styling
+    #[cfg(feature = "color")]
+    pub fn ansi(&self) -> impl std::fmt::Display + '_ {
+        self.0.as_str()
+    }
+
+    /// May allow the compiler to consolidate the `Drop`s for `msg`, reducing code size compared to
+    /// `styled.push_str(&msg)`
+    pub(crate) fn push_string(&mut self, msg: String) {
+        self.0.push_str(&msg);
+    }
+
+    pub(crate) fn push_str(&mut self, msg: &str) {
+        self.0.push_str(msg);
+    }
+
+    pub(crate) fn trim_start_lines(&mut self) {
+        if let Some(pos) = self.0.find('\n') {
+            let (leading, help) = self.0.split_at(pos + 1);
+            if leading.trim().is_empty() {
+                self.0 = help.to_owned()
+            }
+        }
+    }
+
+    pub(crate) fn trim_end(&mut self) {
+        self.0 = self.0.trim_end().to_owned()
+    }
+
+    #[cfg(feature = "help")]
+    pub(crate) fn replace_newline_var(&mut self) {
+        self.0 = self.0.replace("{n}", "\n");
+    }
+
+    #[cfg(feature = "help")]
+    pub(crate) fn indent(&mut self, initial: &str, trailing: &str) {
+        self.0.insert_str(0, initial);
+
+        let mut line_sep = "\n".to_owned();
+        line_sep.push_str(trailing);
+        self.0 = self.0.replace('\n', &line_sep);
+    }
+
+    #[cfg(all(not(feature = "wrap_help"), feature = "help"))]
+    pub(crate) fn wrap(&mut self, _hard_width: usize) {}
+
+    #[cfg(feature = "wrap_help")]
+    pub(crate) fn wrap(&mut self, hard_width: usize) {
+        let mut new = String::with_capacity(self.0.len());
+
+        let mut last = 0;
+        let mut wrapper = crate::output::textwrap::wrap_algorithms::LineWrapper::new(hard_width);
+        for content in self.iter_text() {
+            // Preserve styling
+            let current = content.as_ptr() as usize - self.0.as_str().as_ptr() as usize;
+            if last != current {
+                new.push_str(&self.0.as_str()[last..current]);
+            }
+            last = current + content.len();
+
+            for (i, line) in content.split_inclusive('\n').enumerate() {
+                if 0 < i {
+                    // reset char count on newline, skipping the start as we might have carried
+                    // over from a prior block of styled text
+                    wrapper.reset();
+                }
+                let line = crate::output::textwrap::word_separators::find_words_ascii_space(line)
+                    .collect::<Vec<_>>();
+                new.extend(wrapper.wrap(line));
+            }
+        }
+        if last != self.0.len() {
+            new.push_str(&self.0.as_str()[last..]);
+        }
+        new = new.trim_end().to_owned();
+
+        self.0 = new;
+    }
+
+    #[inline(never)]
+    #[cfg(feature = "help")]
+    pub(crate) fn display_width(&self) -> usize {
+        let mut width = 0;
+        for c in self.iter_text() {
+            width += crate::output::display_width(c);
+        }
+        width
+    }
+
+    #[cfg(feature = "help")]
+    pub(crate) fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+
+    #[cfg(feature = "help")]
+    pub(crate) fn as_styled_str(&self) -> &str {
+        &self.0
+    }
+
+    #[cfg(feature = "color")]
+    pub(crate) fn iter_text(&self) -> impl Iterator<Item = &str> {
+        anstream::adapter::strip_str(&self.0)
+    }
+
+    #[cfg(not(feature = "color"))]
+    pub(crate) fn iter_text(&self) -> impl Iterator<Item = &str> {
+        [self.0.as_str()].into_iter()
+    }
+
+    pub(crate) fn push_styled(&mut self, other: &Self) {
+        self.0.push_str(&other.0);
+    }
+
+    pub(crate) fn write_to(&self, buffer: &mut dyn std::io::Write) -> std::io::Result<()> {
+        ok!(buffer.write_all(self.0.as_bytes()));
+
+        Ok(())
+    }
+}
+
+impl Default for &'_ StyledStr {
+    fn default() -> Self {
+        static DEFAULT: StyledStr = StyledStr::new();
+        &DEFAULT
+    }
+}
+
+impl From<std::string::String> for StyledStr {
+    fn from(name: std::string::String) -> Self {
+        StyledStr(name)
+    }
+}
+
+impl From<&'_ std::string::String> for StyledStr {
+    fn from(name: &'_ std::string::String) -> Self {
+        let mut styled = StyledStr::new();
+        styled.push_str(name);
+        styled
+    }
+}
+
+impl From<&'static str> for StyledStr {
+    fn from(name: &'static str) -> Self {
+        let mut styled = StyledStr::new();
+        styled.push_str(name);
+        styled
+    }
+}
+
+impl From<&'_ &'static str> for StyledStr {
+    fn from(name: &'_ &'static str) -> Self {
+        StyledStr::from(*name)
+    }
+}
+
+impl std::fmt::Write for StyledStr {
+    #[inline]
+    fn write_str(&mut self, s: &str) -> Result<(), std::fmt::Error> {
+        self.0.push_str(s);
+        Ok(())
+    }
+
+    #[inline]
+    fn write_char(&mut self, c: char) -> Result<(), std::fmt::Error> {
+        self.0.push(c);
+        Ok(())
+    }
+}
+
+/// Color-unaware printing. Never uses coloring.
+impl std::fmt::Display for StyledStr {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        for part in self.iter_text() {
+            part.fmt(f)?;
+        }
+
+        Ok(())
+    }
+}
diff --git a/vendor/clap_builder/src/builder/styling.rs b/vendor/clap_builder/src/builder/styling.rs
new file mode 100644
index 0000000..3a03448
--- /dev/null
+++ b/vendor/clap_builder/src/builder/styling.rs
@@ -0,0 +1,179 @@
+//! Terminal [`Styles`] for help and error output
+
+pub use anstyle::*;
+
+/// Terminal styling definitions
+///
+/// See also [`Command::styles`][crate::Command::styles].
+///
+/// # Example
+///
+/// clap v3 styling
+/// ```rust
+/// # use clap_builder as clap;
+/// # use clap::builder::styling::*;
+/// let styles = Styles::styled()
+///     .header(AnsiColor::Yellow.on_default())
+///     .usage(AnsiColor::Green.on_default())
+///     .literal(AnsiColor::Green.on_default())
+///     .placeholder(AnsiColor::Green.on_default());
+/// ```
+#[derive(Clone, Debug)]
+#[allow(missing_copy_implementations)] // Large enough type that I want an explicit `clone()` for now
+pub struct Styles {
+    header: anstyle::Style,
+    error: anstyle::Style,
+    usage: anstyle::Style,
+    literal: anstyle::Style,
+    placeholder: anstyle::Style,
+    valid: anstyle::Style,
+    invalid: anstyle::Style,
+}
+
+impl Styles {
+    /// No terminal styling
+    pub const fn plain() -> Self {
+        Self {
+            header: anstyle::Style::new(),
+            error: anstyle::Style::new(),
+            usage: anstyle::Style::new(),
+            literal: anstyle::Style::new(),
+            placeholder: anstyle::Style::new(),
+            valid: anstyle::Style::new(),
+            invalid: anstyle::Style::new(),
+        }
+    }
+
+    /// Default terminal styling
+    pub const fn styled() -> Self {
+        #[cfg(feature = "color")]
+        {
+            Self {
+                header: anstyle::Style::new().bold().underline(),
+                error: anstyle::Style::new()
+                    .fg_color(Some(anstyle::Color::Ansi(anstyle::AnsiColor::Red)))
+                    .bold(),
+                usage: anstyle::Style::new().bold().underline(),
+                literal: anstyle::Style::new().bold(),
+                placeholder: anstyle::Style::new(),
+                valid: anstyle::Style::new()
+                    .fg_color(Some(anstyle::Color::Ansi(anstyle::AnsiColor::Green))),
+                invalid: anstyle::Style::new()
+                    .fg_color(Some(anstyle::Color::Ansi(anstyle::AnsiColor::Yellow))),
+            }
+        }
+        #[cfg(not(feature = "color"))]
+        {
+            Self::plain()
+        }
+    }
+
+    /// General Heading style, e.g. [`help_heading`][crate::Arg::help_heading]
+    #[inline]
+    pub const fn header(mut self, style: anstyle::Style) -> Self {
+        self.header = style;
+        self
+    }
+
+    /// Error heading
+    #[inline]
+    pub const fn error(mut self, style: anstyle::Style) -> Self {
+        self.error = style;
+        self
+    }
+
+    /// Usage heading
+    #[inline]
+    pub const fn usage(mut self, style: anstyle::Style) -> Self {
+        self.usage = style;
+        self
+    }
+
+    /// Literal command-line syntax, e.g. `--help`
+    #[inline]
+    pub const fn literal(mut self, style: anstyle::Style) -> Self {
+        self.literal = style;
+        self
+    }
+
+    /// Descriptions within command-line syntax, e.g. [`value_name`][crate::Arg::value_name]
+    #[inline]
+    pub const fn placeholder(mut self, style: anstyle::Style) -> Self {
+        self.placeholder = style;
+        self
+    }
+
+    /// Highlight suggested usage
+    #[inline]
+    pub const fn valid(mut self, style: anstyle::Style) -> Self {
+        self.valid = style;
+        self
+    }
+
+    /// Highlight invalid usage
+    #[inline]
+    pub const fn invalid(mut self, style: anstyle::Style) -> Self {
+        self.invalid = style;
+        self
+    }
+}
+
+/// Reflection
+impl Styles {
+    /// General Heading style, e.g. [`help_heading`][crate::Arg::help_heading]
+    #[inline(always)]
+    pub const fn get_header(&self) -> &anstyle::Style {
+        &self.header
+    }
+
+    /// Error heading
+    #[inline(always)]
+    pub const fn get_error(&self) -> &anstyle::Style {
+        &self.error
+    }
+
+    /// Usage heading
+    #[inline(always)]
+    pub const fn get_usage(&self) -> &anstyle::Style {
+        &self.usage
+    }
+
+    /// Literal command-line syntax, e.g. `--help`
+    #[inline(always)]
+    pub const fn get_literal(&self) -> &anstyle::Style {
+        &self.literal
+    }
+
+    /// Descriptions within command-line syntax, e.g. [`value_name`][crate::Arg::value_name]
+    #[inline(always)]
+    pub const fn get_placeholder(&self) -> &anstyle::Style {
+        &self.placeholder
+    }
+
+    /// Highlight suggested usage
+    #[inline(always)]
+    pub const fn get_valid(&self) -> &anstyle::Style {
+        &self.valid
+    }
+
+    /// Highlight invalid usage
+    #[inline(always)]
+    pub const fn get_invalid(&self) -> &anstyle::Style {
+        &self.invalid
+    }
+}
+
+impl super::AppTag for Styles {}
+
+impl Default for Styles {
+    fn default() -> Self {
+        Self::styled()
+    }
+}
+
+impl Default for &'_ Styles {
+    fn default() -> Self {
+        const STYLES: Styles = Styles::styled();
+        &STYLES
+    }
+}
diff --git a/vendor/clap_builder/src/builder/tests.rs b/vendor/clap_builder/src/builder/tests.rs
new file mode 100644
index 0000000..15cb8c4
--- /dev/null
+++ b/vendor/clap_builder/src/builder/tests.rs
@@ -0,0 +1,56 @@
+use crate::Arg;
+use crate::Command;
+
+#[test]
+fn propagate_version() {
+    let mut cmd = Command::new("test")
+        .propagate_version(true)
+        .version("1.1")
+        .subcommand(Command::new("sub1"));
+    cmd._propagate();
+    assert_eq!(
+        cmd.get_subcommands().next().unwrap().get_version(),
+        Some("1.1")
+    );
+}
+
+#[test]
+fn global_setting() {
+    let mut cmd = Command::new("test")
+        .disable_version_flag(true)
+        .subcommand(Command::new("subcmd"));
+    cmd._propagate();
+    assert!(cmd
+        .get_subcommands()
+        .find(|s| s.get_name() == "subcmd")
+        .unwrap()
+        .is_disable_version_flag_set());
+}
+
+// This test will *fail to compile* if Command is not Send + Sync
+#[test]
+fn app_send_sync() {
+    fn foo<T: Send + Sync>(_: T) {}
+    foo(Command::new("test"))
+}
+
+#[test]
+fn issue_2090() {
+    let mut cmd = Command::new("cmd")
+        .disable_version_flag(true)
+        .subcommand(Command::new("sub"));
+    cmd._build_self(false);
+
+    assert!(cmd
+        .get_subcommands()
+        .next()
+        .unwrap()
+        .is_disable_version_flag_set());
+}
+
+// This test will *fail to compile* if Arg is not Send + Sync
+#[test]
+fn arg_send_sync() {
+    fn foo<T: Send + Sync>(_: T) {}
+    foo(Arg::new("test"))
+}
diff --git a/vendor/clap_builder/src/builder/value_hint.rs b/vendor/clap_builder/src/builder/value_hint.rs
new file mode 100644
index 0000000..38fa862
--- /dev/null
+++ b/vendor/clap_builder/src/builder/value_hint.rs
@@ -0,0 +1,90 @@
+use std::str::FromStr;
+
+/// Provide shell with hint on how to complete an argument.
+///
+/// See [Arg::value_hint][crate::Arg::value_hint] to set this on an argument.
+///
+/// See the `clap_complete` crate for completion script generation.
+///
+/// Overview of which hints are supported by which shell:
+///
+/// | Hint                   | zsh | fish[^1]|
+/// | ---------------------- | --- | ------- |
+/// | `AnyPath`              | Yes | Yes     |
+/// | `FilePath`             | Yes | Yes     |
+/// | `DirPath`              | Yes | Yes     |
+/// | `ExecutablePath`       | Yes | Partial |
+/// | `CommandName`          | Yes | Yes     |
+/// | `CommandString`        | Yes | Partial |
+/// | `CommandWithArguments` | Yes |         |
+/// | `Username`             | Yes | Yes     |
+/// | `Hostname`             | Yes | Yes     |
+/// | `Url`                  | Yes |         |
+/// | `EmailAddress`         | Yes |         |
+///
+/// [^1]: fish completions currently only support named arguments (e.g. -o or --opt), not
+///       positional arguments.
+#[derive(Debug, Default, PartialEq, Eq, Hash, Copy, Clone)]
+#[non_exhaustive]
+pub enum ValueHint {
+    /// Default value if hint is not specified. Follows shell default behavior, which is usually
+    /// auto-completing filenames.
+    #[default]
+    Unknown,
+    /// None of the hints below apply. Disables shell completion for this argument.
+    Other,
+    /// Any existing path.
+    AnyPath,
+    /// Path to a file.
+    FilePath,
+    /// Path to a directory.
+    DirPath,
+    /// Path to an executable file.
+    ExecutablePath,
+    /// Name of a command, without arguments. May be relative to PATH, or full path to executable.
+    CommandName,
+    /// A single string containing a command and its arguments.
+    CommandString,
+    /// Capture the remaining arguments as a command name and arguments for that command. This is
+    /// common when writing shell wrappers that execute anther command, for example `sudo` or `env`.
+    ///
+    /// This hint is special, the argument must be a positional argument and have
+    /// [`.num_args(1..)`] and Command must use [`Command::trailing_var_arg(true)`]. The result is that the
+    /// command line `my_app ls -la /` will be parsed as `["ls", "-la", "/"]` and clap won't try to
+    /// parse the `-la` argument itself.
+    ///
+    /// [`Command::trailing_var_arg(true)`]: crate::Command::trailing_var_arg
+    /// [`.num_args(1..)`]: crate::Arg::num_args()
+    CommandWithArguments,
+    /// Name of a local operating system user.
+    Username,
+    /// Host name of a computer.
+    /// Shells usually parse `/etc/hosts` and `.ssh/known_hosts` to complete hostnames.
+    Hostname,
+    /// Complete web address.
+    Url,
+    /// Email address.
+    EmailAddress,
+}
+
+impl FromStr for ValueHint {
+    type Err = String;
+    fn from_str(s: &str) -> Result<Self, <Self as FromStr>::Err> {
+        Ok(match &*s.to_ascii_lowercase() {
+            "unknown" => ValueHint::Unknown,
+            "other" => ValueHint::Other,
+            "anypath" => ValueHint::AnyPath,
+            "filepath" => ValueHint::FilePath,
+            "dirpath" => ValueHint::DirPath,
+            "executablepath" => ValueHint::ExecutablePath,
+            "commandname" => ValueHint::CommandName,
+            "commandstring" => ValueHint::CommandString,
+            "commandwitharguments" => ValueHint::CommandWithArguments,
+            "username" => ValueHint::Username,
+            "hostname" => ValueHint::Hostname,
+            "url" => ValueHint::Url,
+            "emailaddress" => ValueHint::EmailAddress,
+            _ => return Err(format!("unknown ValueHint: `{s}`")),
+        })
+    }
+}
diff --git a/vendor/clap_builder/src/builder/value_parser.rs b/vendor/clap_builder/src/builder/value_parser.rs
new file mode 100644
index 0000000..1f0ef92
--- /dev/null
+++ b/vendor/clap_builder/src/builder/value_parser.rs
@@ -0,0 +1,2712 @@
+use std::convert::TryInto;
+use std::ops::RangeBounds;
+
+use crate::builder::Str;
+use crate::builder::StyledStr;
+use crate::parser::ValueSource;
+use crate::util::AnyValue;
+use crate::util::AnyValueId;
+
+/// Parse/validate argument values
+///
+/// Specified with [`Arg::value_parser`][crate::Arg::value_parser].
+///
+/// `ValueParser` defines how to convert a raw argument value into a validated and typed value for
+/// use within an application.
+///
+/// See
+/// - [`value_parser!`][crate::value_parser] for automatically selecting an implementation for a given type
+/// - [`ValueParser::new`] for additional [`TypedValueParser`] that can be used
+///
+/// # Example
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("color")
+///             .long("color")
+///             .value_parser(["always", "auto", "never"])
+///             .default_value("auto")
+///     )
+///     .arg(
+///         clap::Arg::new("hostname")
+///             .long("hostname")
+///             .value_parser(clap::builder::NonEmptyStringValueParser::new())
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     )
+///     .arg(
+///         clap::Arg::new("port")
+///             .long("port")
+///             .value_parser(clap::value_parser!(u16).range(3000..))
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(
+///     ["cmd", "--hostname", "rust-lang.org", "--port", "3001"]
+/// ).unwrap();
+///
+/// let color: &String = m.get_one("color")
+///     .expect("default");
+/// assert_eq!(color, "auto");
+///
+/// let hostname: &String = m.get_one("hostname")
+///     .expect("required");
+/// assert_eq!(hostname, "rust-lang.org");
+///
+/// let port: u16 = *m.get_one("port")
+///     .expect("required");
+/// assert_eq!(port, 3001);
+/// ```
+pub struct ValueParser(ValueParserInner);
+
+enum ValueParserInner {
+    // Common enough to optimize and for possible values
+    Bool,
+    // Common enough to optimize
+    String,
+    // Common enough to optimize
+    OsString,
+    // Common enough to optimize
+    PathBuf,
+    Other(Box<dyn AnyValueParser>),
+}
+
+impl ValueParser {
+    /// Custom parser for argument values
+    ///
+    /// Pre-existing [`TypedValueParser`] implementations include:
+    /// - `Fn(&str) -> Result<T, E>`
+    /// - [`EnumValueParser`] and  [`PossibleValuesParser`] for static enumerated values
+    /// - [`BoolishValueParser`] and [`FalseyValueParser`] for alternative `bool` implementations
+    /// - [`RangedI64ValueParser`] and [`RangedU64ValueParser`]
+    /// - [`NonEmptyStringValueParser`]
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// type EnvVar = (String, Option<String>);
+    /// fn parse_env_var(env: &str) -> Result<EnvVar, std::io::Error> {
+    ///     if let Some((var, value)) = env.split_once('=') {
+    ///         Ok((var.to_owned(), Some(value.to_owned())))
+    ///     } else {
+    ///         Ok((env.to_owned(), None))
+    ///     }
+    /// }
+    ///
+    /// let mut cmd = clap::Command::new("raw")
+    ///     .arg(
+    ///         clap::Arg::new("env")
+    ///             .value_parser(clap::builder::ValueParser::new(parse_env_var))
+    ///             .required(true)
+    ///     );
+    ///
+    /// let m = cmd.try_get_matches_from_mut(["cmd", "key=value"]).unwrap();
+    /// let port: &EnvVar = m.get_one("env")
+    ///     .expect("required");
+    /// assert_eq!(*port, ("key".into(), Some("value".into())));
+    /// ```
+    pub fn new<P>(other: P) -> Self
+    where
+        P: TypedValueParser,
+    {
+        Self(ValueParserInner::Other(Box::new(other)))
+    }
+
+    /// [`bool`] parser for argument values
+    ///
+    /// See also:
+    /// - [`BoolishValueParser`] for different human readable bool representations
+    /// - [`FalseyValueParser`] for assuming non-false is true
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// let mut cmd = clap::Command::new("raw")
+    ///     .arg(
+    ///         clap::Arg::new("download")
+    ///             .value_parser(clap::value_parser!(bool))
+    ///             .required(true)
+    ///     );
+    ///
+    /// let m = cmd.try_get_matches_from_mut(["cmd", "true"]).unwrap();
+    /// let port: bool = *m.get_one("download")
+    ///     .expect("required");
+    /// assert_eq!(port, true);
+    ///
+    /// assert!(cmd.try_get_matches_from_mut(["cmd", "forever"]).is_err());
+    /// ```
+    pub const fn bool() -> Self {
+        Self(ValueParserInner::Bool)
+    }
+
+    /// [`String`] parser for argument values
+    ///
+    /// See also:
+    /// - [`NonEmptyStringValueParser`]
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// let mut cmd = clap::Command::new("raw")
+    ///     .arg(
+    ///         clap::Arg::new("port")
+    ///             .value_parser(clap::value_parser!(String))
+    ///             .required(true)
+    ///     );
+    ///
+    /// let m = cmd.try_get_matches_from_mut(["cmd", "80"]).unwrap();
+    /// let port: &String = m.get_one("port")
+    ///     .expect("required");
+    /// assert_eq!(port, "80");
+    /// ```
+    pub const fn string() -> Self {
+        Self(ValueParserInner::String)
+    }
+
+    /// [`OsString`][std::ffi::OsString] parser for argument values
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # #[cfg(unix)] {
+    /// # use clap_builder as clap;
+    /// # use clap::{Command, Arg, builder::ValueParser};
+    /// use std::ffi::OsString;
+    /// use std::os::unix::ffi::{OsStrExt,OsStringExt};
+    /// let r = Command::new("myprog")
+    ///     .arg(
+    ///         Arg::new("arg")
+    ///         .required(true)
+    ///         .value_parser(ValueParser::os_string())
+    ///     )
+    ///     .try_get_matches_from(vec![
+    ///         OsString::from("myprog"),
+    ///         OsString::from_vec(vec![0xe9])
+    ///     ]);
+    ///
+    /// assert!(r.is_ok());
+    /// let m = r.unwrap();
+    /// let arg: &OsString = m.get_one("arg")
+    ///     .expect("required");
+    /// assert_eq!(arg.as_bytes(), &[0xe9]);
+    /// # }
+    /// ```
+    pub const fn os_string() -> Self {
+        Self(ValueParserInner::OsString)
+    }
+
+    /// [`PathBuf`][std::path::PathBuf] parser for argument values
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use std::path::PathBuf;
+    /// # use std::path::Path;
+    /// let mut cmd = clap::Command::new("raw")
+    ///     .arg(
+    ///         clap::Arg::new("output")
+    ///             .value_parser(clap::value_parser!(PathBuf))
+    ///             .required(true)
+    ///     );
+    ///
+    /// let m = cmd.try_get_matches_from_mut(["cmd", "hello.txt"]).unwrap();
+    /// let port: &PathBuf = m.get_one("output")
+    ///     .expect("required");
+    /// assert_eq!(port, Path::new("hello.txt"));
+    ///
+    /// assert!(cmd.try_get_matches_from_mut(["cmd", ""]).is_err());
+    /// ```
+    pub const fn path_buf() -> Self {
+        Self(ValueParserInner::PathBuf)
+    }
+}
+
+impl ValueParser {
+    /// Parse into a `AnyValue`
+    ///
+    /// When `arg` is `None`, an external subcommand value is being parsed.
+    pub(crate) fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+        source: ValueSource,
+    ) -> Result<AnyValue, crate::Error> {
+        self.any_value_parser().parse_ref_(cmd, arg, value, source)
+    }
+
+    /// Describes the content of `AnyValue`
+    pub fn type_id(&self) -> AnyValueId {
+        self.any_value_parser().type_id()
+    }
+
+    /// Reflect on enumerated value properties
+    ///
+    /// Error checking should not be done with this; it is mostly targeted at user-facing
+    /// applications like errors and completion.
+    pub fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>> {
+        self.any_value_parser().possible_values()
+    }
+
+    fn any_value_parser(&self) -> &dyn AnyValueParser {
+        match &self.0 {
+            ValueParserInner::Bool => &BoolValueParser {},
+            ValueParserInner::String => &StringValueParser {},
+            ValueParserInner::OsString => &OsStringValueParser {},
+            ValueParserInner::PathBuf => &PathBufValueParser {},
+            ValueParserInner::Other(o) => o.as_ref(),
+        }
+    }
+}
+
+/// Convert a [`TypedValueParser`] to [`ValueParser`]
+///
+/// # Example
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("hostname")
+///             .long("hostname")
+///             .value_parser(clap::builder::NonEmptyStringValueParser::new())
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(
+///     ["cmd", "--hostname", "rust-lang.org"]
+/// ).unwrap();
+///
+/// let hostname: &String = m.get_one("hostname")
+///     .expect("required");
+/// assert_eq!(hostname, "rust-lang.org");
+/// ```
+impl<P> From<P> for ValueParser
+where
+    P: TypedValueParser + Send + Sync + 'static,
+{
+    fn from(p: P) -> Self {
+        Self::new(p)
+    }
+}
+
+impl From<_AnonymousValueParser> for ValueParser {
+    fn from(p: _AnonymousValueParser) -> Self {
+        p.0
+    }
+}
+
+/// Create an `i64` [`ValueParser`] from a `N..M` range
+///
+/// See [`RangedI64ValueParser`] for more control over the output type.
+///
+/// See also [`RangedU64ValueParser`]
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("port")
+///             .long("port")
+///             .value_parser(3000..4000)
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "--port", "3001"]).unwrap();
+/// let port: i64 = *m.get_one("port")
+///     .expect("required");
+/// assert_eq!(port, 3001);
+/// ```
+impl From<std::ops::Range<i64>> for ValueParser {
+    fn from(value: std::ops::Range<i64>) -> Self {
+        let inner = RangedI64ValueParser::<i64>::new().range(value.start..value.end);
+        Self::from(inner)
+    }
+}
+
+/// Create an `i64` [`ValueParser`] from a `N..=M` range
+///
+/// See [`RangedI64ValueParser`] for more control over the output type.
+///
+/// See also [`RangedU64ValueParser`]
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("port")
+///             .long("port")
+///             .value_parser(3000..=4000)
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "--port", "3001"]).unwrap();
+/// let port: i64 = *m.get_one("port")
+///     .expect("required");
+/// assert_eq!(port, 3001);
+/// ```
+impl From<std::ops::RangeInclusive<i64>> for ValueParser {
+    fn from(value: std::ops::RangeInclusive<i64>) -> Self {
+        let inner = RangedI64ValueParser::<i64>::new().range(value.start()..=value.end());
+        Self::from(inner)
+    }
+}
+
+/// Create an `i64` [`ValueParser`] from a `N..` range
+///
+/// See [`RangedI64ValueParser`] for more control over the output type.
+///
+/// See also [`RangedU64ValueParser`]
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("port")
+///             .long("port")
+///             .value_parser(3000..)
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "--port", "3001"]).unwrap();
+/// let port: i64 = *m.get_one("port")
+///     .expect("required");
+/// assert_eq!(port, 3001);
+/// ```
+impl From<std::ops::RangeFrom<i64>> for ValueParser {
+    fn from(value: std::ops::RangeFrom<i64>) -> Self {
+        let inner = RangedI64ValueParser::<i64>::new().range(value.start..);
+        Self::from(inner)
+    }
+}
+
+/// Create an `i64` [`ValueParser`] from a `..M` range
+///
+/// See [`RangedI64ValueParser`] for more control over the output type.
+///
+/// See also [`RangedU64ValueParser`]
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("port")
+///             .long("port")
+///             .value_parser(..3000)
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "--port", "80"]).unwrap();
+/// let port: i64 = *m.get_one("port")
+///     .expect("required");
+/// assert_eq!(port, 80);
+/// ```
+impl From<std::ops::RangeTo<i64>> for ValueParser {
+    fn from(value: std::ops::RangeTo<i64>) -> Self {
+        let inner = RangedI64ValueParser::<i64>::new().range(..value.end);
+        Self::from(inner)
+    }
+}
+
+/// Create an `i64` [`ValueParser`] from a `..=M` range
+///
+/// See [`RangedI64ValueParser`] for more control over the output type.
+///
+/// See also [`RangedU64ValueParser`]
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("port")
+///             .long("port")
+///             .value_parser(..=3000)
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "--port", "80"]).unwrap();
+/// let port: i64 = *m.get_one("port")
+///     .expect("required");
+/// assert_eq!(port, 80);
+/// ```
+impl From<std::ops::RangeToInclusive<i64>> for ValueParser {
+    fn from(value: std::ops::RangeToInclusive<i64>) -> Self {
+        let inner = RangedI64ValueParser::<i64>::new().range(..=value.end);
+        Self::from(inner)
+    }
+}
+
+/// Create an `i64` [`ValueParser`] from a `..` range
+///
+/// See [`RangedI64ValueParser`] for more control over the output type.
+///
+/// See also [`RangedU64ValueParser`]
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("port")
+///             .long("port")
+///             .value_parser(..)
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "--port", "3001"]).unwrap();
+/// let port: i64 = *m.get_one("port")
+///     .expect("required");
+/// assert_eq!(port, 3001);
+/// ```
+impl From<std::ops::RangeFull> for ValueParser {
+    fn from(value: std::ops::RangeFull) -> Self {
+        let inner = RangedI64ValueParser::<i64>::new().range(value);
+        Self::from(inner)
+    }
+}
+
+/// Create a [`ValueParser`] with [`PossibleValuesParser`]
+///
+/// See [`PossibleValuesParser`] for more flexibility in creating the
+/// [`PossibleValue`][crate::builder::PossibleValue]s.
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("color")
+///             .long("color")
+///             .value_parser(["always", "auto", "never"])
+///             .default_value("auto")
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(
+///     ["cmd", "--color", "never"]
+/// ).unwrap();
+///
+/// let color: &String = m.get_one("color")
+///     .expect("default");
+/// assert_eq!(color, "never");
+/// ```
+impl<P, const C: usize> From<[P; C]> for ValueParser
+where
+    P: Into<super::PossibleValue>,
+{
+    fn from(values: [P; C]) -> Self {
+        let inner = PossibleValuesParser::from(values);
+        Self::from(inner)
+    }
+}
+
+/// Create a [`ValueParser`] with [`PossibleValuesParser`]
+///
+/// See [`PossibleValuesParser`] for more flexibility in creating the
+/// [`PossibleValue`][crate::builder::PossibleValue]s.
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// let possible = vec!["always", "auto", "never"];
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("color")
+///             .long("color")
+///             .value_parser(possible)
+///             .default_value("auto")
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(
+///     ["cmd", "--color", "never"]
+/// ).unwrap();
+///
+/// let color: &String = m.get_one("color")
+///     .expect("default");
+/// assert_eq!(color, "never");
+/// ```
+impl<P> From<Vec<P>> for ValueParser
+where
+    P: Into<super::PossibleValue>,
+{
+    fn from(values: Vec<P>) -> Self {
+        let inner = PossibleValuesParser::from(values);
+        Self::from(inner)
+    }
+}
+
+impl std::fmt::Debug for ValueParser {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+        match &self.0 {
+            ValueParserInner::Bool => f.debug_struct("ValueParser::bool").finish(),
+            ValueParserInner::String => f.debug_struct("ValueParser::string").finish(),
+            ValueParserInner::OsString => f.debug_struct("ValueParser::os_string").finish(),
+            ValueParserInner::PathBuf => f.debug_struct("ValueParser::path_buf").finish(),
+            ValueParserInner::Other(o) => write!(f, "ValueParser::other({:?})", o.type_id()),
+        }
+    }
+}
+
+impl Clone for ValueParser {
+    fn clone(&self) -> Self {
+        Self(match &self.0 {
+            ValueParserInner::Bool => ValueParserInner::Bool,
+            ValueParserInner::String => ValueParserInner::String,
+            ValueParserInner::OsString => ValueParserInner::OsString,
+            ValueParserInner::PathBuf => ValueParserInner::PathBuf,
+            ValueParserInner::Other(o) => ValueParserInner::Other(o.clone_any()),
+        })
+    }
+}
+
+/// A type-erased wrapper for [`TypedValueParser`].
+trait AnyValueParser: Send + Sync + 'static {
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<AnyValue, crate::Error>;
+
+    fn parse_ref_(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+        _source: ValueSource,
+    ) -> Result<AnyValue, crate::Error> {
+        self.parse_ref(cmd, arg, value)
+    }
+
+    fn parse(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+    ) -> Result<AnyValue, crate::Error>;
+
+    fn parse_(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+        _source: ValueSource,
+    ) -> Result<AnyValue, crate::Error> {
+        self.parse(cmd, arg, value)
+    }
+
+    /// Describes the content of `AnyValue`
+    fn type_id(&self) -> AnyValueId;
+
+    fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>>;
+
+    fn clone_any(&self) -> Box<dyn AnyValueParser>;
+}
+
+impl<T, P> AnyValueParser for P
+where
+    T: std::any::Any + Clone + Send + Sync + 'static,
+    P: TypedValueParser<Value = T>,
+{
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<AnyValue, crate::Error> {
+        let value = ok!(TypedValueParser::parse_ref(self, cmd, arg, value));
+        Ok(AnyValue::new(value))
+    }
+
+    fn parse_ref_(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+        source: ValueSource,
+    ) -> Result<AnyValue, crate::Error> {
+        let value = ok!(TypedValueParser::parse_ref_(self, cmd, arg, value, source));
+        Ok(AnyValue::new(value))
+    }
+
+    fn parse(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+    ) -> Result<AnyValue, crate::Error> {
+        let value = ok!(TypedValueParser::parse(self, cmd, arg, value));
+        Ok(AnyValue::new(value))
+    }
+
+    fn parse_(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+        source: ValueSource,
+    ) -> Result<AnyValue, crate::Error> {
+        let value = ok!(TypedValueParser::parse_(self, cmd, arg, value, source));
+        Ok(AnyValue::new(value))
+    }
+
+    fn type_id(&self) -> AnyValueId {
+        AnyValueId::of::<T>()
+    }
+
+    fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>> {
+        P::possible_values(self)
+    }
+
+    fn clone_any(&self) -> Box<dyn AnyValueParser> {
+        Box::new(self.clone())
+    }
+}
+
+/// Parse/validate argument values
+///
+/// As alternatives to implementing `TypedValueParser`,
+/// - Use `Fn(&str) -> Result<T, E>` which implements `TypedValueParser`
+/// - [`TypedValueParser::map`] or [`TypedValueParser::try_map`] to adapt an existing `TypedValueParser`
+///
+/// See `ValueParserFactory` to register `TypedValueParser::Value` with
+/// [`value_parser!`][crate::value_parser].
+///
+/// # Example
+///
+/// ```rust
+/// # #[cfg(feature = "error-context")] {
+/// # use clap_builder as clap;
+/// # use clap::error::ErrorKind;
+/// # use clap::error::ContextKind;
+/// # use clap::error::ContextValue;
+/// #[derive(Clone)]
+/// struct Custom(u32);
+///
+/// #[derive(Clone)]
+/// struct CustomValueParser;
+///
+/// impl clap::builder::TypedValueParser for CustomValueParser {
+///     type Value = Custom;
+///
+///     fn parse_ref(
+///         &self,
+///         cmd: &clap::Command,
+///         arg: Option<&clap::Arg>,
+///         value: &std::ffi::OsStr,
+///     ) -> Result<Self::Value, clap::Error> {
+///         let inner = clap::value_parser!(u32);
+///         let val = inner.parse_ref(cmd, arg, value)?;
+///
+///         const INVALID_VALUE: u32 = 10;
+///         if val == INVALID_VALUE {
+///             let mut err = clap::Error::new(ErrorKind::ValueValidation)
+///                 .with_cmd(cmd);
+///             if let Some(arg) = arg {
+///                 err.insert(ContextKind::InvalidArg, ContextValue::String(arg.to_string()));
+///             }
+///             err.insert(ContextKind::InvalidValue, ContextValue::String(INVALID_VALUE.to_string()));
+///             return Err(err);
+///         }
+///
+///         Ok(Custom(val))
+///     }
+/// }
+/// # }
+/// ```
+pub trait TypedValueParser: Clone + Send + Sync + 'static {
+    /// Argument's value type
+    type Value: Send + Sync + Clone;
+
+    /// Parse the argument value
+    ///
+    /// When `arg` is `None`, an external subcommand value is being parsed.
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error>;
+
+    /// Parse the argument value
+    ///
+    /// When `arg` is `None`, an external subcommand value is being parsed.
+    fn parse_ref_(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+        _source: ValueSource,
+    ) -> Result<Self::Value, crate::Error> {
+        self.parse_ref(cmd, arg, value)
+    }
+
+    /// Parse the argument value
+    ///
+    /// When `arg` is `None`, an external subcommand value is being parsed.
+    fn parse(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+    ) -> Result<Self::Value, crate::Error> {
+        self.parse_ref(cmd, arg, &value)
+    }
+
+    /// Parse the argument value
+    ///
+    /// When `arg` is `None`, an external subcommand value is being parsed.
+    fn parse_(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+        _source: ValueSource,
+    ) -> Result<Self::Value, crate::Error> {
+        self.parse(cmd, arg, value)
+    }
+
+    /// Reflect on enumerated value properties
+    ///
+    /// Error checking should not be done with this; it is mostly targeted at user-facing
+    /// applications like errors and completion.
+    fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>> {
+        None
+    }
+
+    /// Adapt a `TypedValueParser` from one value to another
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// # use clap::builder::TypedValueParser as _;
+    /// # use clap::builder::BoolishValueParser;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("flag")
+    ///             .long("flag")
+    ///             .action(clap::ArgAction::SetTrue)
+    ///             .value_parser(
+    ///                 BoolishValueParser::new()
+    ///                 .map(|b| -> usize {
+    ///                     if b { 10 } else { 5 }
+    ///                 })
+    ///             )
+    ///     );
+    ///
+    /// let matches = cmd.clone().try_get_matches_from(["mycmd", "--flag"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_one::<usize>("flag").copied(),
+    ///     Some(10)
+    /// );
+    ///
+    /// let matches = cmd.try_get_matches_from(["mycmd"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_one::<usize>("flag").copied(),
+    ///     Some(5)
+    /// );
+    /// ```
+    fn map<T, F>(self, func: F) -> MapValueParser<Self, F>
+    where
+        T: Send + Sync + Clone,
+        F: Fn(Self::Value) -> T + Clone,
+    {
+        MapValueParser::new(self, func)
+    }
+
+    /// Adapt a `TypedValueParser` from one value to another
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # use clap_builder as clap;
+    /// # use std::ffi::OsString;
+    /// # use std::ffi::OsStr;
+    /// # use std::path::PathBuf;
+    /// # use std::path::Path;
+    /// # use clap::Command;
+    /// # use clap::Arg;
+    /// # use clap::builder::TypedValueParser as _;
+    /// # use clap::builder::OsStringValueParser;
+    /// let cmd = Command::new("mycmd")
+    ///     .arg(
+    ///         Arg::new("flag")
+    ///             .long("flag")
+    ///             .value_parser(
+    ///                 OsStringValueParser::new()
+    ///                 .try_map(verify_ext)
+    ///             )
+    ///     );
+    ///
+    /// fn verify_ext(os: OsString) -> Result<PathBuf, &'static str> {
+    ///     let path = PathBuf::from(os);
+    ///     if path.extension() != Some(OsStr::new("rs")) {
+    ///         return Err("only Rust files are supported");
+    ///     }
+    ///     Ok(path)
+    /// }
+    ///
+    /// let error = cmd.clone().try_get_matches_from(["mycmd", "--flag", "foo.txt"]).unwrap_err();
+    /// error.print();
+    ///
+    /// let matches = cmd.try_get_matches_from(["mycmd", "--flag", "foo.rs"]).unwrap();
+    /// assert!(matches.contains_id("flag"));
+    /// assert_eq!(
+    ///     matches.get_one::<PathBuf>("flag").map(|s| s.as_path()),
+    ///     Some(Path::new("foo.rs"))
+    /// );
+    /// ```
+    fn try_map<T, E, F>(self, func: F) -> TryMapValueParser<Self, F>
+    where
+        F: Fn(Self::Value) -> Result<T, E> + Clone + Send + Sync + 'static,
+        T: Send + Sync + Clone,
+        E: Into<Box<dyn std::error::Error + Send + Sync + 'static>>,
+    {
+        TryMapValueParser::new(self, func)
+    }
+}
+
+impl<F, T, E> TypedValueParser for F
+where
+    F: Fn(&str) -> Result<T, E> + Clone + Send + Sync + 'static,
+    E: Into<Box<dyn std::error::Error + Send + Sync + 'static>>,
+    T: Send + Sync + Clone,
+{
+    type Value = T;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        let value = ok!(value.to_str().ok_or_else(|| {
+            crate::Error::invalid_utf8(
+                cmd,
+                crate::output::Usage::new(cmd).create_usage_with_title(&[]),
+            )
+        }));
+        let value = ok!((self)(value).map_err(|e| {
+            let arg = arg
+                .map(|a| a.to_string())
+                .unwrap_or_else(|| "...".to_owned());
+            crate::Error::value_validation(arg, value.to_owned(), e.into()).with_cmd(cmd)
+        }));
+        Ok(value)
+    }
+}
+
+/// Implementation for [`ValueParser::string`]
+///
+/// Useful for composing new [`TypedValueParser`]s
+#[derive(Copy, Clone, Debug)]
+#[non_exhaustive]
+pub struct StringValueParser {}
+
+impl StringValueParser {
+    /// Implementation for [`ValueParser::string`]
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl TypedValueParser for StringValueParser {
+    type Value = String;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        TypedValueParser::parse(self, cmd, arg, value.to_owned())
+    }
+
+    fn parse(
+        &self,
+        cmd: &crate::Command,
+        _arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+    ) -> Result<Self::Value, crate::Error> {
+        let value = ok!(value.into_string().map_err(|_| {
+            crate::Error::invalid_utf8(
+                cmd,
+                crate::output::Usage::new(cmd).create_usage_with_title(&[]),
+            )
+        }));
+        Ok(value)
+    }
+}
+
+impl Default for StringValueParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Implementation for [`ValueParser::os_string`]
+///
+/// Useful for composing new [`TypedValueParser`]s
+#[derive(Copy, Clone, Debug)]
+#[non_exhaustive]
+pub struct OsStringValueParser {}
+
+impl OsStringValueParser {
+    /// Implementation for [`ValueParser::os_string`]
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl TypedValueParser for OsStringValueParser {
+    type Value = std::ffi::OsString;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        TypedValueParser::parse(self, cmd, arg, value.to_owned())
+    }
+
+    fn parse(
+        &self,
+        _cmd: &crate::Command,
+        _arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+    ) -> Result<Self::Value, crate::Error> {
+        Ok(value)
+    }
+}
+
+impl Default for OsStringValueParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Implementation for [`ValueParser::path_buf`]
+///
+/// Useful for composing new [`TypedValueParser`]s
+#[derive(Copy, Clone, Debug)]
+#[non_exhaustive]
+pub struct PathBufValueParser {}
+
+impl PathBufValueParser {
+    /// Implementation for [`ValueParser::path_buf`]
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl TypedValueParser for PathBufValueParser {
+    type Value = std::path::PathBuf;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        TypedValueParser::parse(self, cmd, arg, value.to_owned())
+    }
+
+    fn parse(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+    ) -> Result<Self::Value, crate::Error> {
+        if value.is_empty() {
+            return Err(crate::Error::empty_value(
+                cmd,
+                &[],
+                arg.map(ToString::to_string)
+                    .unwrap_or_else(|| "...".to_owned()),
+            ));
+        }
+        Ok(Self::Value::from(value))
+    }
+}
+
+impl Default for PathBufValueParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Parse an [`ValueEnum`][crate::ValueEnum] value.
+///
+/// See also:
+/// - [`PossibleValuesParser`]
+///
+/// # Example
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// # use std::ffi::OsStr;
+/// # use clap::ColorChoice;
+/// # use clap::builder::TypedValueParser;
+/// # let cmd = clap::Command::new("test");
+/// # let arg = None;
+///
+/// // Usage
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("color")
+///             .value_parser(clap::builder::EnumValueParser::<ColorChoice>::new())
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "always"]).unwrap();
+/// let port: ColorChoice = *m.get_one("color")
+///     .expect("required");
+/// assert_eq!(port, ColorChoice::Always);
+///
+/// // Semantics
+/// let value_parser = clap::builder::EnumValueParser::<ColorChoice>::new();
+/// // or
+/// let value_parser = clap::value_parser!(ColorChoice);
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("random")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("")).is_err());
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("always")).unwrap(), ColorChoice::Always);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("auto")).unwrap(), ColorChoice::Auto);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("never")).unwrap(), ColorChoice::Never);
+/// ```
+#[derive(Clone, Debug)]
+pub struct EnumValueParser<E: crate::ValueEnum + Clone + Send + Sync + 'static>(
+    std::marker::PhantomData<E>,
+);
+
+impl<E: crate::ValueEnum + Clone + Send + Sync + 'static> EnumValueParser<E> {
+    /// Parse an [`ValueEnum`][crate::ValueEnum]
+    pub fn new() -> Self {
+        let phantom: std::marker::PhantomData<E> = Default::default();
+        Self(phantom)
+    }
+}
+
+impl<E: crate::ValueEnum + Clone + Send + Sync + 'static> TypedValueParser for EnumValueParser<E> {
+    type Value = E;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        let ignore_case = arg.map(|a| a.is_ignore_case_set()).unwrap_or(false);
+        let possible_vals = || {
+            E::value_variants()
+                .iter()
+                .filter_map(|v| v.to_possible_value())
+                .filter(|v| !v.is_hide_set())
+                .map(|v| v.get_name().to_owned())
+                .collect::<Vec<_>>()
+        };
+
+        let value = ok!(value.to_str().ok_or_else(|| {
+            crate::Error::invalid_value(
+                cmd,
+                value.to_string_lossy().into_owned(),
+                &possible_vals(),
+                arg.map(ToString::to_string)
+                    .unwrap_or_else(|| "...".to_owned()),
+            )
+        }));
+        let value = ok!(E::value_variants()
+            .iter()
+            .find(|v| {
+                v.to_possible_value()
+                    .expect("ValueEnum::value_variants contains only values with a corresponding ValueEnum::to_possible_value")
+                    .matches(value, ignore_case)
+            })
+            .ok_or_else(|| {
+            crate::Error::invalid_value(
+                cmd,
+                value.to_owned(),
+                &possible_vals(),
+                arg.map(ToString::to_string)
+                    .unwrap_or_else(|| "...".to_owned()),
+            )
+            }))
+            .clone();
+        Ok(value)
+    }
+
+    fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>> {
+        Some(Box::new(
+            E::value_variants()
+                .iter()
+                .filter_map(|v| v.to_possible_value()),
+        ))
+    }
+}
+
+impl<E: crate::ValueEnum + Clone + Send + Sync + 'static> Default for EnumValueParser<E> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Verify the value is from an enumerated set of [`PossibleValue`][crate::builder::PossibleValue].
+///
+/// See also:
+/// - [`EnumValueParser`] for directly supporting [`ValueEnum`][crate::ValueEnum] types
+/// - [`TypedValueParser::map`] for adapting values to a more specialized type, like an external
+///   enums that can't implement [`ValueEnum`][crate::ValueEnum]
+///
+/// # Example
+///
+/// Usage:
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("color")
+///             .value_parser(clap::builder::PossibleValuesParser::new(["always", "auto", "never"]))
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "always"]).unwrap();
+/// let port: &String = m.get_one("color")
+///     .expect("required");
+/// assert_eq!(port, "always");
+/// ```
+///
+/// Semantics:
+/// ```rust
+/// # use clap_builder as clap;
+/// # use std::ffi::OsStr;
+/// # use clap::builder::TypedValueParser;
+/// # let cmd = clap::Command::new("test");
+/// # let arg = None;
+/// let value_parser = clap::builder::PossibleValuesParser::new(["always", "auto", "never"]);
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("random")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("")).is_err());
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("always")).unwrap(), "always");
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("auto")).unwrap(), "auto");
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("never")).unwrap(), "never");
+/// ```
+#[derive(Clone, Debug)]
+pub struct PossibleValuesParser(Vec<super::PossibleValue>);
+
+impl PossibleValuesParser {
+    /// Verify the value is from an enumerated set of [`PossibleValue`][crate::builder::PossibleValue].
+    pub fn new(values: impl Into<PossibleValuesParser>) -> Self {
+        values.into()
+    }
+}
+
+impl TypedValueParser for PossibleValuesParser {
+    type Value = String;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        TypedValueParser::parse(self, cmd, arg, value.to_owned())
+    }
+
+    fn parse(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+    ) -> Result<String, crate::Error> {
+        let value = ok!(value.into_string().map_err(|_| {
+            crate::Error::invalid_utf8(
+                cmd,
+                crate::output::Usage::new(cmd).create_usage_with_title(&[]),
+            )
+        }));
+
+        let ignore_case = arg.map(|a| a.is_ignore_case_set()).unwrap_or(false);
+        if self.0.iter().any(|v| v.matches(&value, ignore_case)) {
+            Ok(value)
+        } else {
+            let possible_vals = self
+                .0
+                .iter()
+                .filter(|v| !v.is_hide_set())
+                .map(|v| v.get_name().to_owned())
+                .collect::<Vec<_>>();
+
+            Err(crate::Error::invalid_value(
+                cmd,
+                value,
+                &possible_vals,
+                arg.map(ToString::to_string)
+                    .unwrap_or_else(|| "...".to_owned()),
+            ))
+        }
+    }
+
+    fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>> {
+        Some(Box::new(self.0.iter().cloned()))
+    }
+}
+
+impl<I, T> From<I> for PossibleValuesParser
+where
+    I: IntoIterator<Item = T>,
+    T: Into<super::PossibleValue>,
+{
+    fn from(values: I) -> Self {
+        Self(values.into_iter().map(|t| t.into()).collect())
+    }
+}
+
+/// Parse number that fall within a range of values
+///
+/// **NOTE:** To capture negative values, you will also need to set
+/// [`Arg::allow_negative_numbers`][crate::Arg::allow_negative_numbers] or
+/// [`Arg::allow_hyphen_values`][crate::Arg::allow_hyphen_values].
+///
+/// # Example
+///
+/// Usage:
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("port")
+///             .long("port")
+///             .value_parser(clap::value_parser!(u16).range(3000..))
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "--port", "3001"]).unwrap();
+/// let port: u16 = *m.get_one("port")
+///     .expect("required");
+/// assert_eq!(port, 3001);
+/// ```
+///
+/// Semantics:
+/// ```rust
+/// # use clap_builder as clap;
+/// # use std::ffi::OsStr;
+/// # use clap::builder::TypedValueParser;
+/// # let cmd = clap::Command::new("test");
+/// # let arg = None;
+/// let value_parser = clap::builder::RangedI64ValueParser::<i32>::new().range(-1..200);
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("random")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("-200")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("300")).is_err());
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("-1")).unwrap(), -1);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("0")).unwrap(), 0);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("50")).unwrap(), 50);
+/// ```
+#[derive(Copy, Clone, Debug)]
+pub struct RangedI64ValueParser<T: std::convert::TryFrom<i64> + Clone + Send + Sync = i64> {
+    bounds: (std::ops::Bound<i64>, std::ops::Bound<i64>),
+    target: std::marker::PhantomData<T>,
+}
+
+impl<T: std::convert::TryFrom<i64> + Clone + Send + Sync> RangedI64ValueParser<T> {
+    /// Select full range of `i64`
+    pub fn new() -> Self {
+        Self::from(..)
+    }
+
+    /// Narrow the supported range
+    pub fn range<B: RangeBounds<i64>>(mut self, range: B) -> Self {
+        // Consideration: when the user does `value_parser!(u8).range()`
+        // - Avoid programming mistakes by accidentally expanding the range
+        // - Make it convenient to limit the range like with `..10`
+        let start = match range.start_bound() {
+            l @ std::ops::Bound::Included(i) => {
+                debug_assert!(
+                    self.bounds.contains(i),
+                    "{} must be in {:?}",
+                    i,
+                    self.bounds
+                );
+                l.cloned()
+            }
+            l @ std::ops::Bound::Excluded(i) => {
+                debug_assert!(
+                    self.bounds.contains(&i.saturating_add(1)),
+                    "{} must be in {:?}",
+                    i,
+                    self.bounds
+                );
+                l.cloned()
+            }
+            std::ops::Bound::Unbounded => self.bounds.start_bound().cloned(),
+        };
+        let end = match range.end_bound() {
+            l @ std::ops::Bound::Included(i) => {
+                debug_assert!(
+                    self.bounds.contains(i),
+                    "{} must be in {:?}",
+                    i,
+                    self.bounds
+                );
+                l.cloned()
+            }
+            l @ std::ops::Bound::Excluded(i) => {
+                debug_assert!(
+                    self.bounds.contains(&i.saturating_sub(1)),
+                    "{} must be in {:?}",
+                    i,
+                    self.bounds
+                );
+                l.cloned()
+            }
+            std::ops::Bound::Unbounded => self.bounds.end_bound().cloned(),
+        };
+        self.bounds = (start, end);
+        self
+    }
+
+    fn format_bounds(&self) -> String {
+        let mut result = match self.bounds.0 {
+            std::ops::Bound::Included(i) => i.to_string(),
+            std::ops::Bound::Excluded(i) => i.saturating_add(1).to_string(),
+            std::ops::Bound::Unbounded => i64::MIN.to_string(),
+        };
+        result.push_str("..");
+        match self.bounds.1 {
+            std::ops::Bound::Included(i) => {
+                result.push('=');
+                result.push_str(&i.to_string());
+            }
+            std::ops::Bound::Excluded(i) => {
+                result.push_str(&i.to_string());
+            }
+            std::ops::Bound::Unbounded => {
+                result.push_str(&i64::MAX.to_string());
+            }
+        }
+        result
+    }
+}
+
+impl<T: std::convert::TryFrom<i64> + Clone + Send + Sync + 'static> TypedValueParser
+    for RangedI64ValueParser<T>
+where
+    <T as std::convert::TryFrom<i64>>::Error: Send + Sync + 'static + std::error::Error + ToString,
+{
+    type Value = T;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        raw_value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        let value = ok!(raw_value.to_str().ok_or_else(|| {
+            crate::Error::invalid_utf8(
+                cmd,
+                crate::output::Usage::new(cmd).create_usage_with_title(&[]),
+            )
+        }));
+        let value = ok!(value.parse::<i64>().map_err(|err| {
+            let arg = arg
+                .map(|a| a.to_string())
+                .unwrap_or_else(|| "...".to_owned());
+            crate::Error::value_validation(
+                arg,
+                raw_value.to_string_lossy().into_owned(),
+                err.into(),
+            )
+            .with_cmd(cmd)
+        }));
+        if !self.bounds.contains(&value) {
+            let arg = arg
+                .map(|a| a.to_string())
+                .unwrap_or_else(|| "...".to_owned());
+            return Err(crate::Error::value_validation(
+                arg,
+                raw_value.to_string_lossy().into_owned(),
+                format!("{} is not in {}", value, self.format_bounds()).into(),
+            )
+            .with_cmd(cmd));
+        }
+
+        let value: Result<Self::Value, _> = value.try_into();
+        let value = ok!(value.map_err(|err| {
+            let arg = arg
+                .map(|a| a.to_string())
+                .unwrap_or_else(|| "...".to_owned());
+            crate::Error::value_validation(
+                arg,
+                raw_value.to_string_lossy().into_owned(),
+                err.into(),
+            )
+            .with_cmd(cmd)
+        }));
+
+        Ok(value)
+    }
+}
+
+impl<T: std::convert::TryFrom<i64> + Clone + Send + Sync, B: RangeBounds<i64>> From<B>
+    for RangedI64ValueParser<T>
+{
+    fn from(range: B) -> Self {
+        Self {
+            bounds: (range.start_bound().cloned(), range.end_bound().cloned()),
+            target: Default::default(),
+        }
+    }
+}
+
+impl<T: std::convert::TryFrom<i64> + Clone + Send + Sync> Default for RangedI64ValueParser<T> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Parse number that fall within a range of values
+///
+/// # Example
+///
+/// Usage:
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("port")
+///             .long("port")
+///             .value_parser(clap::value_parser!(u64).range(3000..))
+///             .action(clap::ArgAction::Set)
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "--port", "3001"]).unwrap();
+/// let port: u64 = *m.get_one("port")
+///     .expect("required");
+/// assert_eq!(port, 3001);
+/// ```
+///
+/// Semantics:
+/// ```rust
+/// # use clap_builder as clap;
+/// # use std::ffi::OsStr;
+/// # use clap::builder::TypedValueParser;
+/// # let cmd = clap::Command::new("test");
+/// # let arg = None;
+/// let value_parser = clap::builder::RangedU64ValueParser::<u32>::new().range(0..200);
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("random")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("-200")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("300")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("-1")).is_err());
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("0")).unwrap(), 0);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("50")).unwrap(), 50);
+/// ```
+#[derive(Copy, Clone, Debug)]
+pub struct RangedU64ValueParser<T: std::convert::TryFrom<u64> = u64> {
+    bounds: (std::ops::Bound<u64>, std::ops::Bound<u64>),
+    target: std::marker::PhantomData<T>,
+}
+
+impl<T: std::convert::TryFrom<u64>> RangedU64ValueParser<T> {
+    /// Select full range of `u64`
+    pub fn new() -> Self {
+        Self::from(..)
+    }
+
+    /// Narrow the supported range
+    pub fn range<B: RangeBounds<u64>>(mut self, range: B) -> Self {
+        // Consideration: when the user does `value_parser!(u8).range()`
+        // - Avoid programming mistakes by accidentally expanding the range
+        // - Make it convenient to limit the range like with `..10`
+        let start = match range.start_bound() {
+            l @ std::ops::Bound::Included(i) => {
+                debug_assert!(
+                    self.bounds.contains(i),
+                    "{} must be in {:?}",
+                    i,
+                    self.bounds
+                );
+                l.cloned()
+            }
+            l @ std::ops::Bound::Excluded(i) => {
+                debug_assert!(
+                    self.bounds.contains(&i.saturating_add(1)),
+                    "{} must be in {:?}",
+                    i,
+                    self.bounds
+                );
+                l.cloned()
+            }
+            std::ops::Bound::Unbounded => self.bounds.start_bound().cloned(),
+        };
+        let end = match range.end_bound() {
+            l @ std::ops::Bound::Included(i) => {
+                debug_assert!(
+                    self.bounds.contains(i),
+                    "{} must be in {:?}",
+                    i,
+                    self.bounds
+                );
+                l.cloned()
+            }
+            l @ std::ops::Bound::Excluded(i) => {
+                debug_assert!(
+                    self.bounds.contains(&i.saturating_sub(1)),
+                    "{} must be in {:?}",
+                    i,
+                    self.bounds
+                );
+                l.cloned()
+            }
+            std::ops::Bound::Unbounded => self.bounds.end_bound().cloned(),
+        };
+        self.bounds = (start, end);
+        self
+    }
+
+    fn format_bounds(&self) -> String {
+        let mut result = match self.bounds.0 {
+            std::ops::Bound::Included(i) => i.to_string(),
+            std::ops::Bound::Excluded(i) => i.saturating_add(1).to_string(),
+            std::ops::Bound::Unbounded => u64::MIN.to_string(),
+        };
+        result.push_str("..");
+        match self.bounds.1 {
+            std::ops::Bound::Included(i) => {
+                result.push('=');
+                result.push_str(&i.to_string());
+            }
+            std::ops::Bound::Excluded(i) => {
+                result.push_str(&i.to_string());
+            }
+            std::ops::Bound::Unbounded => {
+                result.push_str(&u64::MAX.to_string());
+            }
+        }
+        result
+    }
+}
+
+impl<T: std::convert::TryFrom<u64> + Clone + Send + Sync + 'static> TypedValueParser
+    for RangedU64ValueParser<T>
+where
+    <T as std::convert::TryFrom<u64>>::Error: Send + Sync + 'static + std::error::Error + ToString,
+{
+    type Value = T;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        raw_value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        let value = ok!(raw_value.to_str().ok_or_else(|| {
+            crate::Error::invalid_utf8(
+                cmd,
+                crate::output::Usage::new(cmd).create_usage_with_title(&[]),
+            )
+        }));
+        let value = ok!(value.parse::<u64>().map_err(|err| {
+            let arg = arg
+                .map(|a| a.to_string())
+                .unwrap_or_else(|| "...".to_owned());
+            crate::Error::value_validation(
+                arg,
+                raw_value.to_string_lossy().into_owned(),
+                err.into(),
+            )
+            .with_cmd(cmd)
+        }));
+        if !self.bounds.contains(&value) {
+            let arg = arg
+                .map(|a| a.to_string())
+                .unwrap_or_else(|| "...".to_owned());
+            return Err(crate::Error::value_validation(
+                arg,
+                raw_value.to_string_lossy().into_owned(),
+                format!("{} is not in {}", value, self.format_bounds()).into(),
+            )
+            .with_cmd(cmd));
+        }
+
+        let value: Result<Self::Value, _> = value.try_into();
+        let value = ok!(value.map_err(|err| {
+            let arg = arg
+                .map(|a| a.to_string())
+                .unwrap_or_else(|| "...".to_owned());
+            crate::Error::value_validation(
+                arg,
+                raw_value.to_string_lossy().into_owned(),
+                err.into(),
+            )
+            .with_cmd(cmd)
+        }));
+
+        Ok(value)
+    }
+}
+
+impl<T: std::convert::TryFrom<u64>, B: RangeBounds<u64>> From<B> for RangedU64ValueParser<T> {
+    fn from(range: B) -> Self {
+        Self {
+            bounds: (range.start_bound().cloned(), range.end_bound().cloned()),
+            target: Default::default(),
+        }
+    }
+}
+
+impl<T: std::convert::TryFrom<u64>> Default for RangedU64ValueParser<T> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Implementation for [`ValueParser::bool`]
+///
+/// Useful for composing new [`TypedValueParser`]s
+#[derive(Copy, Clone, Debug)]
+#[non_exhaustive]
+pub struct BoolValueParser {}
+
+impl BoolValueParser {
+    /// Implementation for [`ValueParser::bool`]
+    pub fn new() -> Self {
+        Self {}
+    }
+
+    fn possible_values() -> impl Iterator<Item = crate::builder::PossibleValue> {
+        ["true", "false"]
+            .iter()
+            .copied()
+            .map(crate::builder::PossibleValue::new)
+    }
+}
+
+impl TypedValueParser for BoolValueParser {
+    type Value = bool;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        let value = if value == std::ffi::OsStr::new("true") {
+            true
+        } else if value == std::ffi::OsStr::new("false") {
+            false
+        } else {
+            // Intentionally showing hidden as we hide all of them
+            let possible_vals = Self::possible_values()
+                .map(|v| v.get_name().to_owned())
+                .collect::<Vec<_>>();
+
+            return Err(crate::Error::invalid_value(
+                cmd,
+                value.to_string_lossy().into_owned(),
+                &possible_vals,
+                arg.map(ToString::to_string)
+                    .unwrap_or_else(|| "...".to_owned()),
+            ));
+        };
+        Ok(value)
+    }
+
+    fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>> {
+        Some(Box::new(Self::possible_values()))
+    }
+}
+
+impl Default for BoolValueParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Parse false-like string values, everything else is `true`
+///
+/// See also:
+/// - [`ValueParser::bool`] for assuming non-false is true
+/// - [`BoolishValueParser`] for different human readable bool representations
+///
+/// # Example
+///
+/// Usage:
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("append")
+///             .value_parser(clap::builder::FalseyValueParser::new())
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "true"]).unwrap();
+/// let port: bool = *m.get_one("append")
+///     .expect("required");
+/// assert_eq!(port, true);
+/// ```
+///
+/// Semantics:
+/// ```rust
+/// # use clap_builder as clap;
+/// # use std::ffi::OsStr;
+/// # use clap::builder::TypedValueParser;
+/// # let cmd = clap::Command::new("test");
+/// # let arg = None;
+/// let value_parser = clap::builder::FalseyValueParser::new();
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("random")).unwrap(), true);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("100")).unwrap(), true);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("")).unwrap(), false);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("false")).unwrap(), false);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("No")).unwrap(), false);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("oFF")).unwrap(), false);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("0")).unwrap(), false);
+/// ```
+#[derive(Copy, Clone, Debug)]
+#[non_exhaustive]
+pub struct FalseyValueParser {}
+
+impl FalseyValueParser {
+    /// Parse false-like string values, everything else is `true`
+    pub fn new() -> Self {
+        Self {}
+    }
+
+    fn possible_values() -> impl Iterator<Item = crate::builder::PossibleValue> {
+        crate::util::TRUE_LITERALS
+            .iter()
+            .chain(crate::util::FALSE_LITERALS.iter())
+            .copied()
+            .map(|l| crate::builder::PossibleValue::new(l).hide(l != "true" && l != "false"))
+    }
+}
+
+impl TypedValueParser for FalseyValueParser {
+    type Value = bool;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        _arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        let value = ok!(value.to_str().ok_or_else(|| {
+            crate::Error::invalid_utf8(
+                cmd,
+                crate::output::Usage::new(cmd).create_usage_with_title(&[]),
+            )
+        }));
+        let value = if value.is_empty() {
+            false
+        } else {
+            crate::util::str_to_bool(value).unwrap_or(true)
+        };
+        Ok(value)
+    }
+
+    fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>> {
+        Some(Box::new(Self::possible_values()))
+    }
+}
+
+impl Default for FalseyValueParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Parse bool-like string values, everything else is `true`
+///
+/// See also:
+/// - [`ValueParser::bool`] for different human readable bool representations
+/// - [`FalseyValueParser`] for assuming non-false is true
+///
+/// # Example
+///
+/// Usage:
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("append")
+///             .value_parser(clap::builder::BoolishValueParser::new())
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "true"]).unwrap();
+/// let port: bool = *m.get_one("append")
+///     .expect("required");
+/// assert_eq!(port, true);
+/// ```
+///
+/// Semantics:
+/// ```rust
+/// # use clap_builder as clap;
+/// # use std::ffi::OsStr;
+/// # use clap::builder::TypedValueParser;
+/// # let cmd = clap::Command::new("test");
+/// # let arg = None;
+/// let value_parser = clap::builder::BoolishValueParser::new();
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("random")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("")).is_err());
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("100")).is_err());
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("true")).unwrap(), true);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("Yes")).unwrap(), true);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("oN")).unwrap(), true);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("1")).unwrap(), true);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("false")).unwrap(), false);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("No")).unwrap(), false);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("oFF")).unwrap(), false);
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("0")).unwrap(), false);
+/// ```
+#[derive(Copy, Clone, Debug)]
+#[non_exhaustive]
+pub struct BoolishValueParser {}
+
+impl BoolishValueParser {
+    /// Parse bool-like string values, everything else is `true`
+    pub fn new() -> Self {
+        Self {}
+    }
+
+    fn possible_values() -> impl Iterator<Item = crate::builder::PossibleValue> {
+        crate::util::TRUE_LITERALS
+            .iter()
+            .chain(crate::util::FALSE_LITERALS.iter())
+            .copied()
+            .map(|l| crate::builder::PossibleValue::new(l).hide(l != "true" && l != "false"))
+    }
+}
+
+impl TypedValueParser for BoolishValueParser {
+    type Value = bool;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        let value = ok!(value.to_str().ok_or_else(|| {
+            crate::Error::invalid_utf8(
+                cmd,
+                crate::output::Usage::new(cmd).create_usage_with_title(&[]),
+            )
+        }));
+        let value = ok!(crate::util::str_to_bool(value).ok_or_else(|| {
+            let arg = arg
+                .map(|a| a.to_string())
+                .unwrap_or_else(|| "...".to_owned());
+            crate::Error::value_validation(arg, value.to_owned(), "value was not a boolean".into())
+                .with_cmd(cmd)
+        }));
+        Ok(value)
+    }
+
+    fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>> {
+        Some(Box::new(Self::possible_values()))
+    }
+}
+
+impl Default for BoolishValueParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Parse non-empty string values
+///
+/// See also:
+/// - [`ValueParser::string`]
+///
+/// # Example
+///
+/// Usage:
+/// ```rust
+/// # use clap_builder as clap;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("append")
+///             .value_parser(clap::builder::NonEmptyStringValueParser::new())
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "true"]).unwrap();
+/// let port: &String = m.get_one("append")
+///     .expect("required");
+/// assert_eq!(port, "true");
+/// ```
+///
+/// Semantics:
+/// ```rust
+/// # use clap_builder as clap;
+/// # use std::ffi::OsStr;
+/// # use clap::builder::TypedValueParser;
+/// # let cmd = clap::Command::new("test");
+/// # let arg = None;
+/// let value_parser = clap::builder::NonEmptyStringValueParser::new();
+/// assert_eq!(value_parser.parse_ref(&cmd, arg, OsStr::new("random")).unwrap(), "random");
+/// assert!(value_parser.parse_ref(&cmd, arg, OsStr::new("")).is_err());
+/// ```
+#[derive(Copy, Clone, Debug)]
+#[non_exhaustive]
+pub struct NonEmptyStringValueParser {}
+
+impl NonEmptyStringValueParser {
+    /// Parse non-empty string values
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl TypedValueParser for NonEmptyStringValueParser {
+    type Value = String;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        if value.is_empty() {
+            return Err(crate::Error::empty_value(
+                cmd,
+                &[],
+                arg.map(ToString::to_string)
+                    .unwrap_or_else(|| "...".to_owned()),
+            ));
+        }
+        let value = ok!(value.to_str().ok_or_else(|| {
+            crate::Error::invalid_utf8(
+                cmd,
+                crate::output::Usage::new(cmd).create_usage_with_title(&[]),
+            )
+        }));
+        Ok(value.to_owned())
+    }
+}
+
+impl Default for NonEmptyStringValueParser {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Adapt a `TypedValueParser` from one value to another
+///
+/// See [`TypedValueParser::map`]
+#[derive(Clone, Debug)]
+pub struct MapValueParser<P, F> {
+    parser: P,
+    func: F,
+}
+
+impl<P, F, T> MapValueParser<P, F>
+where
+    P: TypedValueParser,
+    P::Value: Send + Sync + Clone,
+    F: Fn(P::Value) -> T + Clone,
+    T: Send + Sync + Clone,
+{
+    fn new(parser: P, func: F) -> Self {
+        Self { parser, func }
+    }
+}
+
+impl<P, F, T> TypedValueParser for MapValueParser<P, F>
+where
+    P: TypedValueParser,
+    P::Value: Send + Sync + Clone,
+    F: Fn(P::Value) -> T + Clone + Send + Sync + 'static,
+    T: Send + Sync + Clone,
+{
+    type Value = T;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        let value = ok!(self.parser.parse_ref(cmd, arg, value));
+        let value = (self.func)(value);
+        Ok(value)
+    }
+
+    fn parse(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: std::ffi::OsString,
+    ) -> Result<Self::Value, crate::Error> {
+        let value = ok!(self.parser.parse(cmd, arg, value));
+        let value = (self.func)(value);
+        Ok(value)
+    }
+
+    fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>> {
+        self.parser.possible_values()
+    }
+}
+
+/// Adapt a `TypedValueParser` from one value to another
+///
+/// See [`TypedValueParser::try_map`]
+#[derive(Clone, Debug)]
+pub struct TryMapValueParser<P, F> {
+    parser: P,
+    func: F,
+}
+
+impl<P, F, T, E> TryMapValueParser<P, F>
+where
+    P: TypedValueParser,
+    P::Value: Send + Sync + Clone,
+    F: Fn(P::Value) -> Result<T, E> + Clone + Send + Sync + 'static,
+    T: Send + Sync + Clone,
+    E: Into<Box<dyn std::error::Error + Send + Sync + 'static>>,
+{
+    fn new(parser: P, func: F) -> Self {
+        Self { parser, func }
+    }
+}
+
+impl<P, F, T, E> TypedValueParser for TryMapValueParser<P, F>
+where
+    P: TypedValueParser,
+    P::Value: Send + Sync + Clone,
+    F: Fn(P::Value) -> Result<T, E> + Clone + Send + Sync + 'static,
+    T: Send + Sync + Clone,
+    E: Into<Box<dyn std::error::Error + Send + Sync + 'static>>,
+{
+    type Value = T;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        let mid_value = ok!(self.parser.parse_ref(cmd, arg, value));
+        let value = ok!((self.func)(mid_value).map_err(|e| {
+            let arg = arg
+                .map(|a| a.to_string())
+                .unwrap_or_else(|| "...".to_owned());
+            crate::Error::value_validation(arg, value.to_string_lossy().into_owned(), e.into())
+                .with_cmd(cmd)
+        }));
+        Ok(value)
+    }
+
+    fn possible_values(
+        &self,
+    ) -> Option<Box<dyn Iterator<Item = crate::builder::PossibleValue> + '_>> {
+        self.parser.possible_values()
+    }
+}
+
+/// When encountered, report [ErrorKind::UnknownArgument][crate::error::ErrorKind::UnknownArgument]
+///
+/// Useful to help users migrate, either from old versions or similar tools.
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// # use clap::Command;
+/// # use clap::Arg;
+/// let cmd = Command::new("mycmd")
+///     .args([
+///         Arg::new("current-dir")
+///             .short('C'),
+///         Arg::new("current-dir-unknown")
+///             .long("cwd")
+///             .aliases(["current-dir", "directory", "working-directory", "root"])
+///             .value_parser(clap::builder::UnknownArgumentValueParser::suggest_arg("-C"))
+///             .hide(true),
+///     ]);
+///
+/// // Use a supported version of the argument
+/// let matches = cmd.clone().try_get_matches_from(["mycmd", "-C", ".."]).unwrap();
+/// assert!(matches.contains_id("current-dir"));
+/// assert_eq!(
+///     matches.get_many::<String>("current-dir").unwrap_or_default().map(|v| v.as_str()).collect::<Vec<_>>(),
+///     vec![".."]
+/// );
+///
+/// // Use one of the invalid versions
+/// let err = cmd.try_get_matches_from(["mycmd", "--cwd", ".."]).unwrap_err();
+/// assert_eq!(err.kind(), clap::error::ErrorKind::UnknownArgument);
+/// ```
+#[derive(Clone, Debug)]
+pub struct UnknownArgumentValueParser {
+    arg: Option<Str>,
+    suggestions: Vec<StyledStr>,
+}
+
+impl UnknownArgumentValueParser {
+    /// Suggest an alternative argument
+    pub fn suggest_arg(arg: impl Into<Str>) -> Self {
+        Self {
+            arg: Some(arg.into()),
+            suggestions: Default::default(),
+        }
+    }
+
+    /// Provide a general suggestion
+    pub fn suggest(text: impl Into<StyledStr>) -> Self {
+        Self {
+            arg: Default::default(),
+            suggestions: vec![text.into()],
+        }
+    }
+
+    /// Extend the suggestions
+    pub fn and_suggest(mut self, text: impl Into<StyledStr>) -> Self {
+        self.suggestions.push(text.into());
+        self
+    }
+}
+
+impl TypedValueParser for UnknownArgumentValueParser {
+    type Value = String;
+
+    fn parse_ref(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> Result<Self::Value, crate::Error> {
+        TypedValueParser::parse_ref_(self, cmd, arg, value, ValueSource::CommandLine)
+    }
+
+    fn parse_ref_(
+        &self,
+        cmd: &crate::Command,
+        arg: Option<&crate::Arg>,
+        _value: &std::ffi::OsStr,
+        source: ValueSource,
+    ) -> Result<Self::Value, crate::Error> {
+        match source {
+            ValueSource::DefaultValue => {
+                TypedValueParser::parse_ref_(&StringValueParser::new(), cmd, arg, _value, source)
+            }
+            ValueSource::EnvVariable | ValueSource::CommandLine => {
+                let arg = match arg {
+                    Some(arg) => arg.to_string(),
+                    None => "..".to_owned(),
+                };
+                let err = crate::Error::unknown_argument(
+                    cmd,
+                    arg,
+                    self.arg.as_ref().map(|s| (s.as_str().to_owned(), None)),
+                    false,
+                    crate::output::Usage::new(cmd).create_usage_with_title(&[]),
+                );
+                #[cfg(feature = "error-context")]
+                let err = {
+                    debug_assert_eq!(
+                        err.get(crate::error::ContextKind::Suggested),
+                        None,
+                        "Assuming `Error::unknown_argument` doesn't apply any `Suggested` so we can without caution"
+                    );
+                    err.insert_context_unchecked(
+                        crate::error::ContextKind::Suggested,
+                        crate::error::ContextValue::StyledStrs(self.suggestions.clone()),
+                    )
+                };
+                Err(err)
+            }
+        }
+    }
+}
+
+/// Register a type with [value_parser!][crate::value_parser!]
+///
+/// # Example
+///
+/// ```rust
+/// # use clap_builder as clap;
+/// #[derive(Copy, Clone, Debug)]
+/// pub struct Custom(u32);
+///
+/// impl clap::builder::ValueParserFactory for Custom {
+///     type Parser = CustomValueParser;
+///     fn value_parser() -> Self::Parser {
+///         CustomValueParser
+///     }
+/// }
+///
+/// #[derive(Clone, Debug)]
+/// pub struct CustomValueParser;
+/// impl clap::builder::TypedValueParser for CustomValueParser {
+///     type Value = Custom;
+///
+///     fn parse_ref(
+///         &self,
+///         cmd: &clap::Command,
+///         arg: Option<&clap::Arg>,
+///         value: &std::ffi::OsStr,
+///     ) -> Result<Self::Value, clap::Error> {
+///         let inner = clap::value_parser!(u32);
+///         let val = inner.parse_ref(cmd, arg, value)?;
+///         Ok(Custom(val))
+///     }
+/// }
+///
+/// let parser: CustomValueParser = clap::value_parser!(Custom);
+/// ```
+pub trait ValueParserFactory {
+    /// Generated parser, usually [`ValueParser`].
+    ///
+    /// It should at least be a type that supports `Into<ValueParser>`.  A non-`ValueParser` type
+    /// allows the caller to do further initialization on the parser.
+    type Parser;
+
+    /// Create the specified [`Self::Parser`]
+    fn value_parser() -> Self::Parser;
+}
+impl ValueParserFactory for String {
+    type Parser = ValueParser;
+    fn value_parser() -> Self::Parser {
+        ValueParser::string() // Default `clap_derive` to optimized implementation
+    }
+}
+impl ValueParserFactory for Box<str> {
+    type Parser = MapValueParser<StringValueParser, fn(String) -> Box<str>>;
+    fn value_parser() -> Self::Parser {
+        StringValueParser::new().map(String::into_boxed_str)
+    }
+}
+impl ValueParserFactory for std::ffi::OsString {
+    type Parser = ValueParser;
+    fn value_parser() -> Self::Parser {
+        ValueParser::os_string() // Default `clap_derive` to optimized implementation
+    }
+}
+impl ValueParserFactory for Box<std::ffi::OsStr> {
+    type Parser =
+        MapValueParser<OsStringValueParser, fn(std::ffi::OsString) -> Box<std::ffi::OsStr>>;
+    fn value_parser() -> Self::Parser {
+        OsStringValueParser::new().map(std::ffi::OsString::into_boxed_os_str)
+    }
+}
+impl ValueParserFactory for std::path::PathBuf {
+    type Parser = ValueParser;
+    fn value_parser() -> Self::Parser {
+        ValueParser::path_buf() // Default `clap_derive` to optimized implementation
+    }
+}
+impl ValueParserFactory for Box<std::path::Path> {
+    type Parser =
+        MapValueParser<PathBufValueParser, fn(std::path::PathBuf) -> Box<std::path::Path>>;
+    fn value_parser() -> Self::Parser {
+        PathBufValueParser::new().map(std::path::PathBuf::into_boxed_path)
+    }
+}
+impl ValueParserFactory for bool {
+    type Parser = ValueParser;
+    fn value_parser() -> Self::Parser {
+        ValueParser::bool() // Default `clap_derive` to optimized implementation
+    }
+}
+impl ValueParserFactory for u8 {
+    type Parser = RangedI64ValueParser<u8>;
+    fn value_parser() -> Self::Parser {
+        let start: i64 = u8::MIN.into();
+        let end: i64 = u8::MAX.into();
+        RangedI64ValueParser::new().range(start..=end)
+    }
+}
+impl ValueParserFactory for i8 {
+    type Parser = RangedI64ValueParser<i8>;
+    fn value_parser() -> Self::Parser {
+        let start: i64 = i8::MIN.into();
+        let end: i64 = i8::MAX.into();
+        RangedI64ValueParser::new().range(start..=end)
+    }
+}
+impl ValueParserFactory for u16 {
+    type Parser = RangedI64ValueParser<u16>;
+    fn value_parser() -> Self::Parser {
+        let start: i64 = u16::MIN.into();
+        let end: i64 = u16::MAX.into();
+        RangedI64ValueParser::new().range(start..=end)
+    }
+}
+impl ValueParserFactory for i16 {
+    type Parser = RangedI64ValueParser<i16>;
+    fn value_parser() -> Self::Parser {
+        let start: i64 = i16::MIN.into();
+        let end: i64 = i16::MAX.into();
+        RangedI64ValueParser::new().range(start..=end)
+    }
+}
+impl ValueParserFactory for u32 {
+    type Parser = RangedI64ValueParser<u32>;
+    fn value_parser() -> Self::Parser {
+        let start: i64 = u32::MIN.into();
+        let end: i64 = u32::MAX.into();
+        RangedI64ValueParser::new().range(start..=end)
+    }
+}
+impl ValueParserFactory for i32 {
+    type Parser = RangedI64ValueParser<i32>;
+    fn value_parser() -> Self::Parser {
+        let start: i64 = i32::MIN.into();
+        let end: i64 = i32::MAX.into();
+        RangedI64ValueParser::new().range(start..=end)
+    }
+}
+impl ValueParserFactory for u64 {
+    type Parser = RangedU64ValueParser<u64>;
+    fn value_parser() -> Self::Parser {
+        RangedU64ValueParser::new()
+    }
+}
+impl ValueParserFactory for i64 {
+    type Parser = RangedI64ValueParser<i64>;
+    fn value_parser() -> Self::Parser {
+        RangedI64ValueParser::new()
+    }
+}
+impl<T> ValueParserFactory for std::num::Wrapping<T>
+where
+    T: ValueParserFactory,
+    <T as ValueParserFactory>::Parser: TypedValueParser<Value = T>,
+    T: Send + Sync + Clone,
+{
+    type Parser = MapValueParser<<T as ValueParserFactory>::Parser, fn(T) -> std::num::Wrapping<T>>;
+    fn value_parser() -> Self::Parser {
+        T::value_parser().map(std::num::Wrapping)
+    }
+}
+impl<T> ValueParserFactory for Box<T>
+where
+    T: ValueParserFactory,
+    <T as ValueParserFactory>::Parser: TypedValueParser<Value = T>,
+    T: Send + Sync + Clone,
+{
+    type Parser = MapValueParser<<T as ValueParserFactory>::Parser, fn(T) -> Box<T>>;
+    fn value_parser() -> Self::Parser {
+        T::value_parser().map(Box::new)
+    }
+}
+impl<T> ValueParserFactory for std::sync::Arc<T>
+where
+    T: ValueParserFactory,
+    <T as ValueParserFactory>::Parser: TypedValueParser<Value = T>,
+    T: Send + Sync + Clone,
+{
+    type Parser = MapValueParser<<T as ValueParserFactory>::Parser, fn(T) -> std::sync::Arc<T>>;
+    fn value_parser() -> Self::Parser {
+        T::value_parser().map(std::sync::Arc::new)
+    }
+}
+
+#[doc(hidden)]
+#[derive(Debug)]
+pub struct _AutoValueParser<T>(std::marker::PhantomData<T>);
+
+impl<T> _AutoValueParser<T> {
+    #[doc(hidden)]
+    #[allow(clippy::new_without_default)]
+    pub fn new() -> Self {
+        Self(Default::default())
+    }
+}
+
+/// Unstable [`ValueParser`]
+///
+/// Implementation may change to more specific instance in the future
+#[doc(hidden)]
+#[derive(Debug)]
+pub struct _AnonymousValueParser(ValueParser);
+
+#[doc(hidden)]
+pub mod via_prelude {
+    use super::*;
+
+    #[doc(hidden)]
+    pub trait _ValueParserViaFactory: private::_ValueParserViaFactorySealed {
+        type Parser;
+        fn value_parser(&self) -> Self::Parser;
+    }
+    impl<P: ValueParserFactory> _ValueParserViaFactory for &&&&&&_AutoValueParser<P> {
+        type Parser = P::Parser;
+        fn value_parser(&self) -> Self::Parser {
+            P::value_parser()
+        }
+    }
+
+    #[doc(hidden)]
+    pub trait _ValueParserViaValueEnum: private::_ValueParserViaValueEnumSealed {
+        type Output;
+
+        fn value_parser(&self) -> Self::Output;
+    }
+    impl<E: crate::ValueEnum + Clone + Send + Sync + 'static> _ValueParserViaValueEnum
+        for &&&&&_AutoValueParser<E>
+    {
+        type Output = EnumValueParser<E>;
+
+        fn value_parser(&self) -> Self::Output {
+            EnumValueParser::<E>::new()
+        }
+    }
+
+    #[doc(hidden)]
+    pub trait _ValueParserViaFromOsString: private::_ValueParserViaFromOsStringSealed {
+        fn value_parser(&self) -> _AnonymousValueParser;
+    }
+    impl<FromOsString> _ValueParserViaFromOsString for &&&&_AutoValueParser<FromOsString>
+    where
+        FromOsString: From<std::ffi::OsString> + std::any::Any + Clone + Send + Sync + 'static,
+    {
+        fn value_parser(&self) -> _AnonymousValueParser {
+            _AnonymousValueParser(
+                OsStringValueParser::new()
+                    .map(|s| FromOsString::from(s))
+                    .into(),
+            )
+        }
+    }
+
+    #[doc(hidden)]
+    pub trait _ValueParserViaFromOsStr: private::_ValueParserViaFromOsStrSealed {
+        fn value_parser(&self) -> _AnonymousValueParser;
+    }
+    impl<FromOsStr> _ValueParserViaFromOsStr for &&&_AutoValueParser<FromOsStr>
+    where
+        FromOsStr:
+            for<'s> From<&'s std::ffi::OsStr> + std::any::Any + Clone + Send + Sync + 'static,
+    {
+        fn value_parser(&self) -> _AnonymousValueParser {
+            _AnonymousValueParser(
+                OsStringValueParser::new()
+                    .map(|s| FromOsStr::from(&s))
+                    .into(),
+            )
+        }
+    }
+
+    #[doc(hidden)]
+    pub trait _ValueParserViaFromString: private::_ValueParserViaFromStringSealed {
+        fn value_parser(&self) -> _AnonymousValueParser;
+    }
+    impl<FromString> _ValueParserViaFromString for &&_AutoValueParser<FromString>
+    where
+        FromString: From<String> + std::any::Any + Clone + Send + Sync + 'static,
+    {
+        fn value_parser(&self) -> _AnonymousValueParser {
+            _AnonymousValueParser(StringValueParser::new().map(|s| FromString::from(s)).into())
+        }
+    }
+
+    #[doc(hidden)]
+    pub trait _ValueParserViaFromStr: private::_ValueParserViaFromStrSealed {
+        fn value_parser(&self) -> _AnonymousValueParser;
+    }
+    impl<FromStr> _ValueParserViaFromStr for &_AutoValueParser<FromStr>
+    where
+        FromStr: for<'s> From<&'s str> + std::any::Any + Clone + Send + Sync + 'static,
+    {
+        fn value_parser(&self) -> _AnonymousValueParser {
+            _AnonymousValueParser(StringValueParser::new().map(|s| FromStr::from(&s)).into())
+        }
+    }
+
+    #[doc(hidden)]
+    pub trait _ValueParserViaParse: private::_ValueParserViaParseSealed {
+        fn value_parser(&self) -> _AnonymousValueParser;
+    }
+    impl<Parse> _ValueParserViaParse for _AutoValueParser<Parse>
+    where
+        Parse: std::str::FromStr + std::any::Any + Clone + Send + Sync + 'static,
+        <Parse as std::str::FromStr>::Err: Into<Box<dyn std::error::Error + Send + Sync + 'static>>,
+    {
+        fn value_parser(&self) -> _AnonymousValueParser {
+            let func: fn(&str) -> Result<Parse, <Parse as std::str::FromStr>::Err> =
+                Parse::from_str;
+            _AnonymousValueParser(ValueParser::new(func))
+        }
+    }
+}
+
+/// Select a [`ValueParser`] implementation from the intended type
+///
+/// Supported types
+/// - [`ValueParserFactory` types][ValueParserFactory], including
+///   - [Native types][ValueParser]: `bool`, `String`, `OsString`, `PathBuf`
+///   - [Ranged numeric types][RangedI64ValueParser]: `u8`, `i8`, `u16`, `i16`, `u32`, `i32`, `u64`, `i64`
+/// - [`ValueEnum` types][crate::ValueEnum]
+/// - [`From<OsString>` types][std::convert::From] and [`From<&OsStr>` types][std::convert::From]
+/// - [`From<String>` types][std::convert::From] and [`From<&str>` types][std::convert::From]
+/// - [`FromStr` types][std::str::FromStr], including usize, isize
+///
+/// # Example
+///
+/// Usage:
+/// ```rust
+/// # use clap_builder as clap;
+/// # use std::path::PathBuf;
+/// # use std::path::Path;
+/// let mut cmd = clap::Command::new("raw")
+///     .arg(
+///         clap::Arg::new("output")
+///             .value_parser(clap::value_parser!(PathBuf))
+///             .required(true)
+///     );
+///
+/// let m = cmd.try_get_matches_from_mut(["cmd", "file.txt"]).unwrap();
+/// let port: &PathBuf = m.get_one("output")
+///     .expect("required");
+/// assert_eq!(port, Path::new("file.txt"));
+/// ```
+///
+/// Example mappings:
+/// ```rust
+/// # use clap_builder as clap;
+/// # use clap::ColorChoice;
+/// // Built-in types
+/// let parser = clap::value_parser!(String);
+/// assert_eq!(format!("{parser:?}"), "ValueParser::string");
+/// let parser = clap::value_parser!(std::ffi::OsString);
+/// assert_eq!(format!("{parser:?}"), "ValueParser::os_string");
+/// let parser = clap::value_parser!(std::path::PathBuf);
+/// assert_eq!(format!("{parser:?}"), "ValueParser::path_buf");
+/// clap::value_parser!(u16).range(3000..);
+/// clap::value_parser!(u64).range(3000..);
+///
+/// // FromStr types
+/// let parser = clap::value_parser!(usize);
+/// assert_eq!(format!("{parser:?}"), "_AnonymousValueParser(ValueParser::other(usize))");
+///
+/// // ValueEnum types
+/// clap::value_parser!(ColorChoice);
+/// ```
+#[macro_export]
+macro_rules! value_parser {
+    ($name:ty) => {{
+        use $crate::builder::via_prelude::*;
+        let auto = $crate::builder::_AutoValueParser::<$name>::new();
+        (&&&&&&auto).value_parser()
+    }};
+}
+
+mod private {
+    use super::*;
+
+    // Prefer these so `clap_derive` defaults to optimized implementations
+    pub trait _ValueParserViaSelfSealed {}
+    impl<P: Into<ValueParser>> _ValueParserViaSelfSealed for &&&&&&&_AutoValueParser<P> {}
+
+    pub trait _ValueParserViaFactorySealed {}
+    impl<P: ValueParserFactory> _ValueParserViaFactorySealed for &&&&&&_AutoValueParser<P> {}
+
+    pub trait _ValueParserViaValueEnumSealed {}
+    impl<E: crate::ValueEnum> _ValueParserViaValueEnumSealed for &&&&&_AutoValueParser<E> {}
+
+    pub trait _ValueParserViaFromOsStringSealed {}
+    impl<FromOsString> _ValueParserViaFromOsStringSealed for &&&&_AutoValueParser<FromOsString> where
+        FromOsString: From<std::ffi::OsString> + std::any::Any + Send + Sync + 'static
+    {
+    }
+
+    pub trait _ValueParserViaFromOsStrSealed {}
+    impl<FromOsStr> _ValueParserViaFromOsStrSealed for &&&_AutoValueParser<FromOsStr> where
+        FromOsStr: for<'s> From<&'s std::ffi::OsStr> + std::any::Any + Send + Sync + 'static
+    {
+    }
+
+    pub trait _ValueParserViaFromStringSealed {}
+    impl<FromString> _ValueParserViaFromStringSealed for &&_AutoValueParser<FromString> where
+        FromString: From<String> + std::any::Any + Send + Sync + 'static
+    {
+    }
+
+    pub trait _ValueParserViaFromStrSealed {}
+    impl<FromStr> _ValueParserViaFromStrSealed for &_AutoValueParser<FromStr> where
+        FromStr: for<'s> From<&'s str> + std::any::Any + Send + Sync + 'static
+    {
+    }
+
+    pub trait _ValueParserViaParseSealed {}
+    impl<Parse> _ValueParserViaParseSealed for _AutoValueParser<Parse>
+    where
+        Parse: std::str::FromStr + std::any::Any + Send + Sync + 'static,
+        <Parse as std::str::FromStr>::Err: Into<Box<dyn std::error::Error + Send + Sync + 'static>>,
+    {
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn ensure_typed_applies_to_parse() {
+        fn parse(_: &str) -> Result<usize, std::io::Error> {
+            Ok(10)
+        }
+        let cmd = crate::Command::new("cmd");
+        let arg = None;
+        assert_eq!(
+            TypedValueParser::parse_ref(&parse, &cmd, arg, std::ffi::OsStr::new("foo")).unwrap(),
+            10
+        );
+    }
+}