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diff --git a/vendor/proc-macro2/src/lib.rs b/vendor/proc-macro2/src/lib.rs
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--- a/vendor/proc-macro2/src/lib.rs
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@@ -1,1328 +0,0 @@
-//! [![github]](https://github.com/dtolnay/proc-macro2) [![crates-io]](https://crates.io/crates/proc-macro2) [![docs-rs]](crate)
-//!
-//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github
-//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust
-//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs
-//!
-//! <br>
-//!
-//! A wrapper around the procedural macro API of the compiler's [`proc_macro`]
-//! crate. This library serves two purposes:
-//!
-//! [`proc_macro`]: https://doc.rust-lang.org/proc_macro/
-//!
-//! - **Bring proc-macro-like functionality to other contexts like build.rs and
-//!   main.rs.** Types from `proc_macro` are entirely specific to procedural
-//!   macros and cannot ever exist in code outside of a procedural macro.
-//!   Meanwhile `proc_macro2` types may exist anywhere including non-macro code.
-//!   By developing foundational libraries like [syn] and [quote] against
-//!   `proc_macro2` rather than `proc_macro`, the procedural macro ecosystem
-//!   becomes easily applicable to many other use cases and we avoid
-//!   reimplementing non-macro equivalents of those libraries.
-//!
-//! - **Make procedural macros unit testable.** As a consequence of being
-//!   specific to procedural macros, nothing that uses `proc_macro` can be
-//!   executed from a unit test. In order for helper libraries or components of
-//!   a macro to be testable in isolation, they must be implemented using
-//!   `proc_macro2`.
-//!
-//! [syn]: https://github.com/dtolnay/syn
-//! [quote]: https://github.com/dtolnay/quote
-//!
-//! # Usage
-//!
-//! The skeleton of a typical procedural macro typically looks like this:
-//!
-//! ```
-//! extern crate proc_macro;
-//!
-//! # const IGNORE: &str = stringify! {
-//! #[proc_macro_derive(MyDerive)]
-//! # };
-//! # #[cfg(wrap_proc_macro)]
-//! pub fn my_derive(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
-//!     let input = proc_macro2::TokenStream::from(input);
-//!
-//!     let output: proc_macro2::TokenStream = {
-//!         /* transform input */
-//!         # input
-//!     };
-//!
-//!     proc_macro::TokenStream::from(output)
-//! }
-//! ```
-//!
-//! If parsing with [Syn], you'll use [`parse_macro_input!`] instead to
-//! propagate parse errors correctly back to the compiler when parsing fails.
-//!
-//! [`parse_macro_input!`]: https://docs.rs/syn/2.0/syn/macro.parse_macro_input.html
-//!
-//! # Unstable features
-//!
-//! The default feature set of proc-macro2 tracks the most recent stable
-//! compiler API. Functionality in `proc_macro` that is not yet stable is not
-//! exposed by proc-macro2 by default.
-//!
-//! To opt into the additional APIs available in the most recent nightly
-//! compiler, the `procmacro2_semver_exempt` config flag must be passed to
-//! rustc. We will polyfill those nightly-only APIs back to Rust 1.56.0. As
-//! these are unstable APIs that track the nightly compiler, minor versions of
-//! proc-macro2 may make breaking changes to them at any time.
-//!
-//! ```sh
-//! RUSTFLAGS='--cfg procmacro2_semver_exempt' cargo build
-//! ```
-//!
-//! Note that this must not only be done for your crate, but for any crate that
-//! depends on your crate. This infectious nature is intentional, as it serves
-//! as a reminder that you are outside of the normal semver guarantees.
-//!
-//! Semver exempt methods are marked as such in the proc-macro2 documentation.
-//!
-//! # Thread-Safety
-//!
-//! Most types in this crate are `!Sync` because the underlying compiler
-//! types make use of thread-local memory, meaning they cannot be accessed from
-//! a different thread.
-
-// Proc-macro2 types in rustdoc of other crates get linked to here.
-#![doc(html_root_url = "https://docs.rs/proc-macro2/1.0.76")]
-#![cfg_attr(any(proc_macro_span, super_unstable), feature(proc_macro_span))]
-#![cfg_attr(super_unstable, feature(proc_macro_def_site))]
-#![cfg_attr(doc_cfg, feature(doc_cfg))]
-#![deny(unsafe_op_in_unsafe_fn)]
-#![allow(
-    clippy::cast_lossless,
-    clippy::cast_possible_truncation,
-    clippy::checked_conversions,
-    clippy::doc_markdown,
-    clippy::items_after_statements,
-    clippy::iter_without_into_iter,
-    clippy::let_underscore_untyped,
-    clippy::manual_assert,
-    clippy::manual_range_contains,
-    clippy::missing_safety_doc,
-    clippy::must_use_candidate,
-    clippy::needless_doctest_main,
-    clippy::new_without_default,
-    clippy::return_self_not_must_use,
-    clippy::shadow_unrelated,
-    clippy::trivially_copy_pass_by_ref,
-    clippy::unnecessary_wraps,
-    clippy::unused_self,
-    clippy::used_underscore_binding,
-    clippy::vec_init_then_push
-)]
-
-#[cfg(all(procmacro2_semver_exempt, wrap_proc_macro, not(super_unstable)))]
-compile_error! {"\
-    Something is not right. If you've tried to turn on \
-    procmacro2_semver_exempt, you need to ensure that it \
-    is turned on for the compilation of the proc-macro2 \
-    build script as well.
-"}
-
-#[cfg(all(
-    procmacro2_nightly_testing,
-    feature = "proc-macro",
-    not(proc_macro_span)
-))]
-compile_error! {"\
-    Build script probe failed to compile.
-"}
-
-extern crate alloc;
-
-#[cfg(feature = "proc-macro")]
-extern crate proc_macro;
-
-mod marker;
-mod parse;
-mod rcvec;
-
-#[cfg(wrap_proc_macro)]
-mod detection;
-
-// Public for proc_macro2::fallback::force() and unforce(), but those are quite
-// a niche use case so we omit it from rustdoc.
-#[doc(hidden)]
-pub mod fallback;
-
-pub mod extra;
-
-#[cfg(not(wrap_proc_macro))]
-use crate::fallback as imp;
-#[path = "wrapper.rs"]
-#[cfg(wrap_proc_macro)]
-mod imp;
-
-#[cfg(span_locations)]
-mod location;
-
-use crate::extra::DelimSpan;
-use crate::marker::Marker;
-use core::cmp::Ordering;
-use core::fmt::{self, Debug, Display};
-use core::hash::{Hash, Hasher};
-use core::ops::RangeBounds;
-use core::str::FromStr;
-use std::error::Error;
-#[cfg(procmacro2_semver_exempt)]
-use std::path::PathBuf;
-
-#[cfg(span_locations)]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "span-locations")))]
-pub use crate::location::LineColumn;
-
-/// An abstract stream of tokens, or more concretely a sequence of token trees.
-///
-/// This type provides interfaces for iterating over token trees and for
-/// collecting token trees into one stream.
-///
-/// Token stream is both the input and output of `#[proc_macro]`,
-/// `#[proc_macro_attribute]` and `#[proc_macro_derive]` definitions.
-#[derive(Clone)]
-pub struct TokenStream {
-    inner: imp::TokenStream,
-    _marker: Marker,
-}
-
-/// Error returned from `TokenStream::from_str`.
-pub struct LexError {
-    inner: imp::LexError,
-    _marker: Marker,
-}
-
-impl TokenStream {
-    fn _new(inner: imp::TokenStream) -> Self {
-        TokenStream {
-            inner,
-            _marker: Marker,
-        }
-    }
-
-    fn _new_fallback(inner: fallback::TokenStream) -> Self {
-        TokenStream {
-            inner: inner.into(),
-            _marker: Marker,
-        }
-    }
-
-    /// Returns an empty `TokenStream` containing no token trees.
-    pub fn new() -> Self {
-        TokenStream::_new(imp::TokenStream::new())
-    }
-
-    /// Checks if this `TokenStream` is empty.
-    pub fn is_empty(&self) -> bool {
-        self.inner.is_empty()
-    }
-}
-
-/// `TokenStream::default()` returns an empty stream,
-/// i.e. this is equivalent with `TokenStream::new()`.
-impl Default for TokenStream {
-    fn default() -> Self {
-        TokenStream::new()
-    }
-}
-
-/// Attempts to break the string into tokens and parse those tokens into a token
-/// stream.
-///
-/// May fail for a number of reasons, for example, if the string contains
-/// unbalanced delimiters or characters not existing in the language.
-///
-/// NOTE: Some errors may cause panics instead of returning `LexError`. We
-/// reserve the right to change these errors into `LexError`s later.
-impl FromStr for TokenStream {
-    type Err = LexError;
-
-    fn from_str(src: &str) -> Result<TokenStream, LexError> {
-        let e = src.parse().map_err(|e| LexError {
-            inner: e,
-            _marker: Marker,
-        })?;
-        Ok(TokenStream::_new(e))
-    }
-}
-
-#[cfg(feature = "proc-macro")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "proc-macro")))]
-impl From<proc_macro::TokenStream> for TokenStream {
-    fn from(inner: proc_macro::TokenStream) -> Self {
-        TokenStream::_new(inner.into())
-    }
-}
-
-#[cfg(feature = "proc-macro")]
-#[cfg_attr(doc_cfg, doc(cfg(feature = "proc-macro")))]
-impl From<TokenStream> for proc_macro::TokenStream {
-    fn from(inner: TokenStream) -> Self {
-        inner.inner.into()
-    }
-}
-
-impl From<TokenTree> for TokenStream {
-    fn from(token: TokenTree) -> Self {
-        TokenStream::_new(imp::TokenStream::from(token))
-    }
-}
-
-impl Extend<TokenTree> for TokenStream {
-    fn extend<I: IntoIterator<Item = TokenTree>>(&mut self, streams: I) {
-        self.inner.extend(streams);
-    }
-}
-
-impl Extend<TokenStream> for TokenStream {
-    fn extend<I: IntoIterator<Item = TokenStream>>(&mut self, streams: I) {
-        self.inner
-            .extend(streams.into_iter().map(|stream| stream.inner));
-    }
-}
-
-/// Collects a number of token trees into a single stream.
-impl FromIterator<TokenTree> for TokenStream {
-    fn from_iter<I: IntoIterator<Item = TokenTree>>(streams: I) -> Self {
-        TokenStream::_new(streams.into_iter().collect())
-    }
-}
-impl FromIterator<TokenStream> for TokenStream {
-    fn from_iter<I: IntoIterator<Item = TokenStream>>(streams: I) -> Self {
-        TokenStream::_new(streams.into_iter().map(|i| i.inner).collect())
-    }
-}
-
-/// Prints the token stream as a string that is supposed to be losslessly
-/// convertible back into the same token stream (modulo spans), except for
-/// possibly `TokenTree::Group`s with `Delimiter::None` delimiters and negative
-/// numeric literals.
-impl Display for TokenStream {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Display::fmt(&self.inner, f)
-    }
-}
-
-/// Prints token in a form convenient for debugging.
-impl Debug for TokenStream {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Debug::fmt(&self.inner, f)
-    }
-}
-
-impl LexError {
-    pub fn span(&self) -> Span {
-        Span::_new(self.inner.span())
-    }
-}
-
-impl Debug for LexError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Debug::fmt(&self.inner, f)
-    }
-}
-
-impl Display for LexError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Display::fmt(&self.inner, f)
-    }
-}
-
-impl Error for LexError {}
-
-/// The source file of a given `Span`.
-///
-/// This type is semver exempt and not exposed by default.
-#[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))]
-#[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))]
-#[derive(Clone, PartialEq, Eq)]
-pub struct SourceFile {
-    inner: imp::SourceFile,
-    _marker: Marker,
-}
-
-#[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))]
-impl SourceFile {
-    fn _new(inner: imp::SourceFile) -> Self {
-        SourceFile {
-            inner,
-            _marker: Marker,
-        }
-    }
-
-    /// Get the path to this source file.
-    ///
-    /// ### Note
-    ///
-    /// If the code span associated with this `SourceFile` was generated by an
-    /// external macro, this may not be an actual path on the filesystem. Use
-    /// [`is_real`] to check.
-    ///
-    /// Also note that even if `is_real` returns `true`, if
-    /// `--remap-path-prefix` was passed on the command line, the path as given
-    /// may not actually be valid.
-    ///
-    /// [`is_real`]: #method.is_real
-    pub fn path(&self) -> PathBuf {
-        self.inner.path()
-    }
-
-    /// Returns `true` if this source file is a real source file, and not
-    /// generated by an external macro's expansion.
-    pub fn is_real(&self) -> bool {
-        self.inner.is_real()
-    }
-}
-
-#[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))]
-impl Debug for SourceFile {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Debug::fmt(&self.inner, f)
-    }
-}
-
-/// A region of source code, along with macro expansion information.
-#[derive(Copy, Clone)]
-pub struct Span {
-    inner: imp::Span,
-    _marker: Marker,
-}
-
-impl Span {
-    fn _new(inner: imp::Span) -> Self {
-        Span {
-            inner,
-            _marker: Marker,
-        }
-    }
-
-    fn _new_fallback(inner: fallback::Span) -> Self {
-        Span {
-            inner: inner.into(),
-            _marker: Marker,
-        }
-    }
-
-    /// The span of the invocation of the current procedural macro.
-    ///
-    /// Identifiers created with this span will be resolved as if they were
-    /// written directly at the macro call location (call-site hygiene) and
-    /// other code at the macro call site will be able to refer to them as well.
-    pub fn call_site() -> Self {
-        Span::_new(imp::Span::call_site())
-    }
-
-    /// The span located at the invocation of the procedural macro, but with
-    /// local variables, labels, and `$crate` resolved at the definition site
-    /// of the macro. This is the same hygiene behavior as `macro_rules`.
-    pub fn mixed_site() -> Self {
-        Span::_new(imp::Span::mixed_site())
-    }
-
-    /// A span that resolves at the macro definition site.
-    ///
-    /// This method is semver exempt and not exposed by default.
-    #[cfg(procmacro2_semver_exempt)]
-    #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))]
-    pub fn def_site() -> Self {
-        Span::_new(imp::Span::def_site())
-    }
-
-    /// Creates a new span with the same line/column information as `self` but
-    /// that resolves symbols as though it were at `other`.
-    pub fn resolved_at(&self, other: Span) -> Span {
-        Span::_new(self.inner.resolved_at(other.inner))
-    }
-
-    /// Creates a new span with the same name resolution behavior as `self` but
-    /// with the line/column information of `other`.
-    pub fn located_at(&self, other: Span) -> Span {
-        Span::_new(self.inner.located_at(other.inner))
-    }
-
-    /// Convert `proc_macro2::Span` to `proc_macro::Span`.
-    ///
-    /// This method is available when building with a nightly compiler, or when
-    /// building with rustc 1.29+ *without* semver exempt features.
-    ///
-    /// # Panics
-    ///
-    /// Panics if called from outside of a procedural macro. Unlike
-    /// `proc_macro2::Span`, the `proc_macro::Span` type can only exist within
-    /// the context of a procedural macro invocation.
-    #[cfg(wrap_proc_macro)]
-    pub fn unwrap(self) -> proc_macro::Span {
-        self.inner.unwrap()
-    }
-
-    // Soft deprecated. Please use Span::unwrap.
-    #[cfg(wrap_proc_macro)]
-    #[doc(hidden)]
-    pub fn unstable(self) -> proc_macro::Span {
-        self.unwrap()
-    }
-
-    /// The original source file into which this span points.
-    ///
-    /// This method is semver exempt and not exposed by default.
-    #[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))]
-    #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))]
-    pub fn source_file(&self) -> SourceFile {
-        SourceFile::_new(self.inner.source_file())
-    }
-
-    /// Get the starting line/column in the source file for this span.
-    ///
-    /// This method requires the `"span-locations"` feature to be enabled.
-    ///
-    /// When executing in a procedural macro context, the returned line/column
-    /// are only meaningful if compiled with a nightly toolchain. The stable
-    /// toolchain does not have this information available. When executing
-    /// outside of a procedural macro, such as main.rs or build.rs, the
-    /// line/column are always meaningful regardless of toolchain.
-    #[cfg(span_locations)]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "span-locations")))]
-    pub fn start(&self) -> LineColumn {
-        self.inner.start()
-    }
-
-    /// Get the ending line/column in the source file for this span.
-    ///
-    /// This method requires the `"span-locations"` feature to be enabled.
-    ///
-    /// When executing in a procedural macro context, the returned line/column
-    /// are only meaningful if compiled with a nightly toolchain. The stable
-    /// toolchain does not have this information available. When executing
-    /// outside of a procedural macro, such as main.rs or build.rs, the
-    /// line/column are always meaningful regardless of toolchain.
-    #[cfg(span_locations)]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "span-locations")))]
-    pub fn end(&self) -> LineColumn {
-        self.inner.end()
-    }
-
-    /// Create a new span encompassing `self` and `other`.
-    ///
-    /// Returns `None` if `self` and `other` are from different files.
-    ///
-    /// Warning: the underlying [`proc_macro::Span::join`] method is
-    /// nightly-only. When called from within a procedural macro not using a
-    /// nightly compiler, this method will always return `None`.
-    ///
-    /// [`proc_macro::Span::join`]: https://doc.rust-lang.org/proc_macro/struct.Span.html#method.join
-    pub fn join(&self, other: Span) -> Option<Span> {
-        self.inner.join(other.inner).map(Span::_new)
-    }
-
-    /// Compares two spans to see if they're equal.
-    ///
-    /// This method is semver exempt and not exposed by default.
-    #[cfg(procmacro2_semver_exempt)]
-    #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))]
-    pub fn eq(&self, other: &Span) -> bool {
-        self.inner.eq(&other.inner)
-    }
-
-    /// Returns the source text behind a span. This preserves the original
-    /// source code, including spaces and comments. It only returns a result if
-    /// the span corresponds to real source code.
-    ///
-    /// Note: The observable result of a macro should only rely on the tokens
-    /// and not on this source text. The result of this function is a best
-    /// effort to be used for diagnostics only.
-    pub fn source_text(&self) -> Option<String> {
-        self.inner.source_text()
-    }
-}
-
-/// Prints a span in a form convenient for debugging.
-impl Debug for Span {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Debug::fmt(&self.inner, f)
-    }
-}
-
-/// A single token or a delimited sequence of token trees (e.g. `[1, (), ..]`).
-#[derive(Clone)]
-pub enum TokenTree {
-    /// A token stream surrounded by bracket delimiters.
-    Group(Group),
-    /// An identifier.
-    Ident(Ident),
-    /// A single punctuation character (`+`, `,`, `$`, etc.).
-    Punct(Punct),
-    /// A literal character (`'a'`), string (`"hello"`), number (`2.3`), etc.
-    Literal(Literal),
-}
-
-impl TokenTree {
-    /// Returns the span of this tree, delegating to the `span` method of
-    /// the contained token or a delimited stream.
-    pub fn span(&self) -> Span {
-        match self {
-            TokenTree::Group(t) => t.span(),
-            TokenTree::Ident(t) => t.span(),
-            TokenTree::Punct(t) => t.span(),
-            TokenTree::Literal(t) => t.span(),
-        }
-    }
-
-    /// Configures the span for *only this token*.
-    ///
-    /// Note that if this token is a `Group` then this method will not configure
-    /// the span of each of the internal tokens, this will simply delegate to
-    /// the `set_span` method of each variant.
-    pub fn set_span(&mut self, span: Span) {
-        match self {
-            TokenTree::Group(t) => t.set_span(span),
-            TokenTree::Ident(t) => t.set_span(span),
-            TokenTree::Punct(t) => t.set_span(span),
-            TokenTree::Literal(t) => t.set_span(span),
-        }
-    }
-}
-
-impl From<Group> for TokenTree {
-    fn from(g: Group) -> Self {
-        TokenTree::Group(g)
-    }
-}
-
-impl From<Ident> for TokenTree {
-    fn from(g: Ident) -> Self {
-        TokenTree::Ident(g)
-    }
-}
-
-impl From<Punct> for TokenTree {
-    fn from(g: Punct) -> Self {
-        TokenTree::Punct(g)
-    }
-}
-
-impl From<Literal> for TokenTree {
-    fn from(g: Literal) -> Self {
-        TokenTree::Literal(g)
-    }
-}
-
-/// Prints the token tree as a string that is supposed to be losslessly
-/// convertible back into the same token tree (modulo spans), except for
-/// possibly `TokenTree::Group`s with `Delimiter::None` delimiters and negative
-/// numeric literals.
-impl Display for TokenTree {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match self {
-            TokenTree::Group(t) => Display::fmt(t, f),
-            TokenTree::Ident(t) => Display::fmt(t, f),
-            TokenTree::Punct(t) => Display::fmt(t, f),
-            TokenTree::Literal(t) => Display::fmt(t, f),
-        }
-    }
-}
-
-/// Prints token tree in a form convenient for debugging.
-impl Debug for TokenTree {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        // Each of these has the name in the struct type in the derived debug,
-        // so don't bother with an extra layer of indirection
-        match self {
-            TokenTree::Group(t) => Debug::fmt(t, f),
-            TokenTree::Ident(t) => {
-                let mut debug = f.debug_struct("Ident");
-                debug.field("sym", &format_args!("{}", t));
-                imp::debug_span_field_if_nontrivial(&mut debug, t.span().inner);
-                debug.finish()
-            }
-            TokenTree::Punct(t) => Debug::fmt(t, f),
-            TokenTree::Literal(t) => Debug::fmt(t, f),
-        }
-    }
-}
-
-/// A delimited token stream.
-///
-/// A `Group` internally contains a `TokenStream` which is surrounded by
-/// `Delimiter`s.
-#[derive(Clone)]
-pub struct Group {
-    inner: imp::Group,
-}
-
-/// Describes how a sequence of token trees is delimited.
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
-pub enum Delimiter {
-    /// `( ... )`
-    Parenthesis,
-    /// `{ ... }`
-    Brace,
-    /// `[ ... ]`
-    Bracket,
-    /// `Ø ... Ø`
-    ///
-    /// An implicit delimiter, that may, for example, appear around tokens
-    /// coming from a "macro variable" `$var`. It is important to preserve
-    /// operator priorities in cases like `$var * 3` where `$var` is `1 + 2`.
-    /// Implicit delimiters may not survive roundtrip of a token stream through
-    /// a string.
-    None,
-}
-
-impl Group {
-    fn _new(inner: imp::Group) -> Self {
-        Group { inner }
-    }
-
-    fn _new_fallback(inner: fallback::Group) -> Self {
-        Group {
-            inner: inner.into(),
-        }
-    }
-
-    /// Creates a new `Group` with the given delimiter and token stream.
-    ///
-    /// This constructor will set the span for this group to
-    /// `Span::call_site()`. To change the span you can use the `set_span`
-    /// method below.
-    pub fn new(delimiter: Delimiter, stream: TokenStream) -> Self {
-        Group {
-            inner: imp::Group::new(delimiter, stream.inner),
-        }
-    }
-
-    /// Returns the punctuation used as the delimiter for this group: a set of
-    /// parentheses, square brackets, or curly braces.
-    pub fn delimiter(&self) -> Delimiter {
-        self.inner.delimiter()
-    }
-
-    /// Returns the `TokenStream` of tokens that are delimited in this `Group`.
-    ///
-    /// Note that the returned token stream does not include the delimiter
-    /// returned above.
-    pub fn stream(&self) -> TokenStream {
-        TokenStream::_new(self.inner.stream())
-    }
-
-    /// Returns the span for the delimiters of this token stream, spanning the
-    /// entire `Group`.
-    ///
-    /// ```text
-    /// pub fn span(&self) -> Span {
-    ///            ^^^^^^^
-    /// ```
-    pub fn span(&self) -> Span {
-        Span::_new(self.inner.span())
-    }
-
-    /// Returns the span pointing to the opening delimiter of this group.
-    ///
-    /// ```text
-    /// pub fn span_open(&self) -> Span {
-    ///                 ^
-    /// ```
-    pub fn span_open(&self) -> Span {
-        Span::_new(self.inner.span_open())
-    }
-
-    /// Returns the span pointing to the closing delimiter of this group.
-    ///
-    /// ```text
-    /// pub fn span_close(&self) -> Span {
-    ///                        ^
-    /// ```
-    pub fn span_close(&self) -> Span {
-        Span::_new(self.inner.span_close())
-    }
-
-    /// Returns an object that holds this group's `span_open()` and
-    /// `span_close()` together (in a more compact representation than holding
-    /// those 2 spans individually).
-    pub fn delim_span(&self) -> DelimSpan {
-        DelimSpan::new(&self.inner)
-    }
-
-    /// Configures the span for this `Group`'s delimiters, but not its internal
-    /// tokens.
-    ///
-    /// This method will **not** set the span of all the internal tokens spanned
-    /// by this group, but rather it will only set the span of the delimiter
-    /// tokens at the level of the `Group`.
-    pub fn set_span(&mut self, span: Span) {
-        self.inner.set_span(span.inner);
-    }
-}
-
-/// Prints the group as a string that should be losslessly convertible back
-/// into the same group (modulo spans), except for possibly `TokenTree::Group`s
-/// with `Delimiter::None` delimiters.
-impl Display for Group {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        Display::fmt(&self.inner, formatter)
-    }
-}
-
-impl Debug for Group {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        Debug::fmt(&self.inner, formatter)
-    }
-}
-
-/// A `Punct` is a single punctuation character like `+`, `-` or `#`.
-///
-/// Multicharacter operators like `+=` are represented as two instances of
-/// `Punct` with different forms of `Spacing` returned.
-#[derive(Clone)]
-pub struct Punct {
-    ch: char,
-    spacing: Spacing,
-    span: Span,
-}
-
-/// Whether a `Punct` is followed immediately by another `Punct` or followed by
-/// another token or whitespace.
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
-pub enum Spacing {
-    /// E.g. `+` is `Alone` in `+ =`, `+ident` or `+()`.
-    Alone,
-    /// E.g. `+` is `Joint` in `+=` or `'` is `Joint` in `'#`.
-    ///
-    /// Additionally, single quote `'` can join with identifiers to form
-    /// lifetimes `'ident`.
-    Joint,
-}
-
-impl Punct {
-    /// Creates a new `Punct` from the given character and spacing.
-    ///
-    /// The `ch` argument must be a valid punctuation character permitted by the
-    /// language, otherwise the function will panic.
-    ///
-    /// The returned `Punct` will have the default span of `Span::call_site()`
-    /// which can be further configured with the `set_span` method below.
-    pub fn new(ch: char, spacing: Spacing) -> Self {
-        Punct {
-            ch,
-            spacing,
-            span: Span::call_site(),
-        }
-    }
-
-    /// Returns the value of this punctuation character as `char`.
-    pub fn as_char(&self) -> char {
-        self.ch
-    }
-
-    /// Returns the spacing of this punctuation character, indicating whether
-    /// it's immediately followed by another `Punct` in the token stream, so
-    /// they can potentially be combined into a multicharacter operator
-    /// (`Joint`), or it's followed by some other token or whitespace (`Alone`)
-    /// so the operator has certainly ended.
-    pub fn spacing(&self) -> Spacing {
-        self.spacing
-    }
-
-    /// Returns the span for this punctuation character.
-    pub fn span(&self) -> Span {
-        self.span
-    }
-
-    /// Configure the span for this punctuation character.
-    pub fn set_span(&mut self, span: Span) {
-        self.span = span;
-    }
-}
-
-/// Prints the punctuation character as a string that should be losslessly
-/// convertible back into the same character.
-impl Display for Punct {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Display::fmt(&self.ch, f)
-    }
-}
-
-impl Debug for Punct {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        let mut debug = fmt.debug_struct("Punct");
-        debug.field("char", &self.ch);
-        debug.field("spacing", &self.spacing);
-        imp::debug_span_field_if_nontrivial(&mut debug, self.span.inner);
-        debug.finish()
-    }
-}
-
-/// A word of Rust code, which may be a keyword or legal variable name.
-///
-/// An identifier consists of at least one Unicode code point, the first of
-/// which has the XID_Start property and the rest of which have the XID_Continue
-/// property.
-///
-/// - The empty string is not an identifier. Use `Option<Ident>`.
-/// - A lifetime is not an identifier. Use `syn::Lifetime` instead.
-///
-/// An identifier constructed with `Ident::new` is permitted to be a Rust
-/// keyword, though parsing one through its [`Parse`] implementation rejects
-/// Rust keywords. Use `input.call(Ident::parse_any)` when parsing to match the
-/// behaviour of `Ident::new`.
-///
-/// [`Parse`]: https://docs.rs/syn/2.0/syn/parse/trait.Parse.html
-///
-/// # Examples
-///
-/// A new ident can be created from a string using the `Ident::new` function.
-/// A span must be provided explicitly which governs the name resolution
-/// behavior of the resulting identifier.
-///
-/// ```
-/// use proc_macro2::{Ident, Span};
-///
-/// fn main() {
-///     let call_ident = Ident::new("calligraphy", Span::call_site());
-///
-///     println!("{}", call_ident);
-/// }
-/// ```
-///
-/// An ident can be interpolated into a token stream using the `quote!` macro.
-///
-/// ```
-/// use proc_macro2::{Ident, Span};
-/// use quote::quote;
-///
-/// fn main() {
-///     let ident = Ident::new("demo", Span::call_site());
-///
-///     // Create a variable binding whose name is this ident.
-///     let expanded = quote! { let #ident = 10; };
-///
-///     // Create a variable binding with a slightly different name.
-///     let temp_ident = Ident::new(&format!("new_{}", ident), Span::call_site());
-///     let expanded = quote! { let #temp_ident = 10; };
-/// }
-/// ```
-///
-/// A string representation of the ident is available through the `to_string()`
-/// method.
-///
-/// ```
-/// # use proc_macro2::{Ident, Span};
-/// #
-/// # let ident = Ident::new("another_identifier", Span::call_site());
-/// #
-/// // Examine the ident as a string.
-/// let ident_string = ident.to_string();
-/// if ident_string.len() > 60 {
-///     println!("Very long identifier: {}", ident_string)
-/// }
-/// ```
-#[derive(Clone)]
-pub struct Ident {
-    inner: imp::Ident,
-    _marker: Marker,
-}
-
-impl Ident {
-    fn _new(inner: imp::Ident) -> Self {
-        Ident {
-            inner,
-            _marker: Marker,
-        }
-    }
-
-    /// Creates a new `Ident` with the given `string` as well as the specified
-    /// `span`.
-    ///
-    /// The `string` argument must be a valid identifier permitted by the
-    /// language, otherwise the function will panic.
-    ///
-    /// Note that `span`, currently in rustc, configures the hygiene information
-    /// for this identifier.
-    ///
-    /// As of this time `Span::call_site()` explicitly opts-in to "call-site"
-    /// hygiene meaning that identifiers created with this span will be resolved
-    /// as if they were written directly at the location of the macro call, and
-    /// other code at the macro call site will be able to refer to them as well.
-    ///
-    /// Later spans like `Span::def_site()` will allow to opt-in to
-    /// "definition-site" hygiene meaning that identifiers created with this
-    /// span will be resolved at the location of the macro definition and other
-    /// code at the macro call site will not be able to refer to them.
-    ///
-    /// Due to the current importance of hygiene this constructor, unlike other
-    /// tokens, requires a `Span` to be specified at construction.
-    ///
-    /// # Panics
-    ///
-    /// Panics if the input string is neither a keyword nor a legal variable
-    /// name. If you are not sure whether the string contains an identifier and
-    /// need to handle an error case, use
-    /// <a href="https://docs.rs/syn/2.0/syn/fn.parse_str.html"><code
-    ///   style="padding-right:0;">syn::parse_str</code></a><code
-    ///   style="padding-left:0;">::&lt;Ident&gt;</code>
-    /// rather than `Ident::new`.
-    #[track_caller]
-    pub fn new(string: &str, span: Span) -> Self {
-        Ident::_new(imp::Ident::new_checked(string, span.inner))
-    }
-
-    /// Same as `Ident::new`, but creates a raw identifier (`r#ident`). The
-    /// `string` argument must be a valid identifier permitted by the language
-    /// (including keywords, e.g. `fn`). Keywords which are usable in path
-    /// segments (e.g. `self`, `super`) are not supported, and will cause a
-    /// panic.
-    #[track_caller]
-    pub fn new_raw(string: &str, span: Span) -> Self {
-        Ident::_new(imp::Ident::new_raw_checked(string, span.inner))
-    }
-
-    /// Returns the span of this `Ident`.
-    pub fn span(&self) -> Span {
-        Span::_new(self.inner.span())
-    }
-
-    /// Configures the span of this `Ident`, possibly changing its hygiene
-    /// context.
-    pub fn set_span(&mut self, span: Span) {
-        self.inner.set_span(span.inner);
-    }
-}
-
-impl PartialEq for Ident {
-    fn eq(&self, other: &Ident) -> bool {
-        self.inner == other.inner
-    }
-}
-
-impl<T> PartialEq<T> for Ident
-where
-    T: ?Sized + AsRef<str>,
-{
-    fn eq(&self, other: &T) -> bool {
-        self.inner == other
-    }
-}
-
-impl Eq for Ident {}
-
-impl PartialOrd for Ident {
-    fn partial_cmp(&self, other: &Ident) -> Option<Ordering> {
-        Some(self.cmp(other))
-    }
-}
-
-impl Ord for Ident {
-    fn cmp(&self, other: &Ident) -> Ordering {
-        self.to_string().cmp(&other.to_string())
-    }
-}
-
-impl Hash for Ident {
-    fn hash<H: Hasher>(&self, hasher: &mut H) {
-        self.to_string().hash(hasher);
-    }
-}
-
-/// Prints the identifier as a string that should be losslessly convertible back
-/// into the same identifier.
-impl Display for Ident {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Display::fmt(&self.inner, f)
-    }
-}
-
-impl Debug for Ident {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Debug::fmt(&self.inner, f)
-    }
-}
-
-/// A literal string (`"hello"`), byte string (`b"hello"`), character (`'a'`),
-/// byte character (`b'a'`), an integer or floating point number with or without
-/// a suffix (`1`, `1u8`, `2.3`, `2.3f32`).
-///
-/// Boolean literals like `true` and `false` do not belong here, they are
-/// `Ident`s.
-#[derive(Clone)]
-pub struct Literal {
-    inner: imp::Literal,
-    _marker: Marker,
-}
-
-macro_rules! suffixed_int_literals {
-    ($($name:ident => $kind:ident,)*) => ($(
-        /// Creates a new suffixed integer literal with the specified value.
-        ///
-        /// This function will create an integer like `1u32` where the integer
-        /// value specified is the first part of the token and the integral is
-        /// also suffixed at the end. Literals created from negative numbers may
-        /// not survive roundtrips through `TokenStream` or strings and may be
-        /// broken into two tokens (`-` and positive literal).
-        ///
-        /// Literals created through this method have the `Span::call_site()`
-        /// span by default, which can be configured with the `set_span` method
-        /// below.
-        pub fn $name(n: $kind) -> Literal {
-            Literal::_new(imp::Literal::$name(n))
-        }
-    )*)
-}
-
-macro_rules! unsuffixed_int_literals {
-    ($($name:ident => $kind:ident,)*) => ($(
-        /// Creates a new unsuffixed integer literal with the specified value.
-        ///
-        /// This function will create an integer like `1` where the integer
-        /// value specified is the first part of the token. No suffix is
-        /// specified on this token, meaning that invocations like
-        /// `Literal::i8_unsuffixed(1)` are equivalent to
-        /// `Literal::u32_unsuffixed(1)`. Literals created from negative numbers
-        /// may not survive roundtrips through `TokenStream` or strings and may
-        /// be broken into two tokens (`-` and positive literal).
-        ///
-        /// Literals created through this method have the `Span::call_site()`
-        /// span by default, which can be configured with the `set_span` method
-        /// below.
-        pub fn $name(n: $kind) -> Literal {
-            Literal::_new(imp::Literal::$name(n))
-        }
-    )*)
-}
-
-impl Literal {
-    fn _new(inner: imp::Literal) -> Self {
-        Literal {
-            inner,
-            _marker: Marker,
-        }
-    }
-
-    fn _new_fallback(inner: fallback::Literal) -> Self {
-        Literal {
-            inner: inner.into(),
-            _marker: Marker,
-        }
-    }
-
-    suffixed_int_literals! {
-        u8_suffixed => u8,
-        u16_suffixed => u16,
-        u32_suffixed => u32,
-        u64_suffixed => u64,
-        u128_suffixed => u128,
-        usize_suffixed => usize,
-        i8_suffixed => i8,
-        i16_suffixed => i16,
-        i32_suffixed => i32,
-        i64_suffixed => i64,
-        i128_suffixed => i128,
-        isize_suffixed => isize,
-    }
-
-    unsuffixed_int_literals! {
-        u8_unsuffixed => u8,
-        u16_unsuffixed => u16,
-        u32_unsuffixed => u32,
-        u64_unsuffixed => u64,
-        u128_unsuffixed => u128,
-        usize_unsuffixed => usize,
-        i8_unsuffixed => i8,
-        i16_unsuffixed => i16,
-        i32_unsuffixed => i32,
-        i64_unsuffixed => i64,
-        i128_unsuffixed => i128,
-        isize_unsuffixed => isize,
-    }
-
-    /// Creates a new unsuffixed floating-point literal.
-    ///
-    /// This constructor is similar to those like `Literal::i8_unsuffixed` where
-    /// the float's value is emitted directly into the token but no suffix is
-    /// used, so it may be inferred to be a `f64` later in the compiler.
-    /// Literals created from negative numbers may not survive round-trips
-    /// through `TokenStream` or strings and may be broken into two tokens (`-`
-    /// and positive literal).
-    ///
-    /// # Panics
-    ///
-    /// This function requires that the specified float is finite, for example
-    /// if it is infinity or NaN this function will panic.
-    pub fn f64_unsuffixed(f: f64) -> Literal {
-        assert!(f.is_finite());
-        Literal::_new(imp::Literal::f64_unsuffixed(f))
-    }
-
-    /// Creates a new suffixed floating-point literal.
-    ///
-    /// This constructor will create a literal like `1.0f64` where the value
-    /// specified is the preceding part of the token and `f64` is the suffix of
-    /// the token. This token will always be inferred to be an `f64` in the
-    /// compiler. Literals created from negative numbers may not survive
-    /// round-trips through `TokenStream` or strings and may be broken into two
-    /// tokens (`-` and positive literal).
-    ///
-    /// # Panics
-    ///
-    /// This function requires that the specified float is finite, for example
-    /// if it is infinity or NaN this function will panic.
-    pub fn f64_suffixed(f: f64) -> Literal {
-        assert!(f.is_finite());
-        Literal::_new(imp::Literal::f64_suffixed(f))
-    }
-
-    /// Creates a new unsuffixed floating-point literal.
-    ///
-    /// This constructor is similar to those like `Literal::i8_unsuffixed` where
-    /// the float's value is emitted directly into the token but no suffix is
-    /// used, so it may be inferred to be a `f64` later in the compiler.
-    /// Literals created from negative numbers may not survive round-trips
-    /// through `TokenStream` or strings and may be broken into two tokens (`-`
-    /// and positive literal).
-    ///
-    /// # Panics
-    ///
-    /// This function requires that the specified float is finite, for example
-    /// if it is infinity or NaN this function will panic.
-    pub fn f32_unsuffixed(f: f32) -> Literal {
-        assert!(f.is_finite());
-        Literal::_new(imp::Literal::f32_unsuffixed(f))
-    }
-
-    /// Creates a new suffixed floating-point literal.
-    ///
-    /// This constructor will create a literal like `1.0f32` where the value
-    /// specified is the preceding part of the token and `f32` is the suffix of
-    /// the token. This token will always be inferred to be an `f32` in the
-    /// compiler. Literals created from negative numbers may not survive
-    /// round-trips through `TokenStream` or strings and may be broken into two
-    /// tokens (`-` and positive literal).
-    ///
-    /// # Panics
-    ///
-    /// This function requires that the specified float is finite, for example
-    /// if it is infinity or NaN this function will panic.
-    pub fn f32_suffixed(f: f32) -> Literal {
-        assert!(f.is_finite());
-        Literal::_new(imp::Literal::f32_suffixed(f))
-    }
-
-    /// String literal.
-    pub fn string(string: &str) -> Literal {
-        Literal::_new(imp::Literal::string(string))
-    }
-
-    /// Character literal.
-    pub fn character(ch: char) -> Literal {
-        Literal::_new(imp::Literal::character(ch))
-    }
-
-    /// Byte string literal.
-    pub fn byte_string(s: &[u8]) -> Literal {
-        Literal::_new(imp::Literal::byte_string(s))
-    }
-
-    /// Returns the span encompassing this literal.
-    pub fn span(&self) -> Span {
-        Span::_new(self.inner.span())
-    }
-
-    /// Configures the span associated for this literal.
-    pub fn set_span(&mut self, span: Span) {
-        self.inner.set_span(span.inner);
-    }
-
-    /// Returns a `Span` that is a subset of `self.span()` containing only
-    /// the source bytes in range `range`. Returns `None` if the would-be
-    /// trimmed span is outside the bounds of `self`.
-    ///
-    /// Warning: the underlying [`proc_macro::Literal::subspan`] method is
-    /// nightly-only. When called from within a procedural macro not using a
-    /// nightly compiler, this method will always return `None`.
-    ///
-    /// [`proc_macro::Literal::subspan`]: https://doc.rust-lang.org/proc_macro/struct.Literal.html#method.subspan
-    pub fn subspan<R: RangeBounds<usize>>(&self, range: R) -> Option<Span> {
-        self.inner.subspan(range).map(Span::_new)
-    }
-
-    // Intended for the `quote!` macro to use when constructing a proc-macro2
-    // token out of a macro_rules $:literal token, which is already known to be
-    // a valid literal. This avoids reparsing/validating the literal's string
-    // representation. This is not public API other than for quote.
-    #[doc(hidden)]
-    pub unsafe fn from_str_unchecked(repr: &str) -> Self {
-        Literal::_new(unsafe { imp::Literal::from_str_unchecked(repr) })
-    }
-}
-
-impl FromStr for Literal {
-    type Err = LexError;
-
-    fn from_str(repr: &str) -> Result<Self, LexError> {
-        repr.parse().map(Literal::_new).map_err(|inner| LexError {
-            inner,
-            _marker: Marker,
-        })
-    }
-}
-
-impl Debug for Literal {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Debug::fmt(&self.inner, f)
-    }
-}
-
-impl Display for Literal {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Display::fmt(&self.inner, f)
-    }
-}
-
-/// Public implementation details for the `TokenStream` type, such as iterators.
-pub mod token_stream {
-    use crate::marker::Marker;
-    use crate::{imp, TokenTree};
-    use core::fmt::{self, Debug};
-
-    pub use crate::TokenStream;
-
-    /// An iterator over `TokenStream`'s `TokenTree`s.
-    ///
-    /// The iteration is "shallow", e.g. the iterator doesn't recurse into
-    /// delimited groups, and returns whole groups as token trees.
-    #[derive(Clone)]
-    pub struct IntoIter {
-        inner: imp::TokenTreeIter,
-        _marker: Marker,
-    }
-
-    impl Iterator for IntoIter {
-        type Item = TokenTree;
-
-        fn next(&mut self) -> Option<TokenTree> {
-            self.inner.next()
-        }
-
-        fn size_hint(&self) -> (usize, Option<usize>) {
-            self.inner.size_hint()
-        }
-    }
-
-    impl Debug for IntoIter {
-        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-            f.write_str("TokenStream ")?;
-            f.debug_list().entries(self.clone()).finish()
-        }
-    }
-
-    impl IntoIterator for TokenStream {
-        type Item = TokenTree;
-        type IntoIter = IntoIter;
-
-        fn into_iter(self) -> IntoIter {
-            IntoIter {
-                inner: self.inner.into_iter(),
-                _marker: Marker,
-            }
-        }
-    }
-}