From a990de90fe41456a23e58bd087d2f107d321f3a1 Mon Sep 17 00:00:00 2001
From: Valentin Popov <valentin@popov.link>
Date: Fri, 19 Jul 2024 16:37:58 +0400
Subject: Deleted vendor folder

---
 vendor/syn/src/expr.rs | 3506 ------------------------------------------------
 1 file changed, 3506 deletions(-)
 delete mode 100644 vendor/syn/src/expr.rs

(limited to 'vendor/syn/src/expr.rs')

diff --git a/vendor/syn/src/expr.rs b/vendor/syn/src/expr.rs
deleted file mode 100644
index 7fb0f7b..0000000
--- a/vendor/syn/src/expr.rs
+++ /dev/null
@@ -1,3506 +0,0 @@
-use super::*;
-use crate::punctuated::Punctuated;
-use proc_macro2::{Span, TokenStream};
-#[cfg(feature = "printing")]
-use quote::IdentFragment;
-#[cfg(feature = "printing")]
-use std::fmt::{self, Display};
-use std::hash::{Hash, Hasher};
-#[cfg(feature = "parsing")]
-use std::mem;
-
-ast_enum_of_structs! {
-    /// A Rust expression.
-    ///
-    /// *This type is available only if Syn is built with the `"derive"` or `"full"`
-    /// feature, but most of the variants are not available unless "full" is enabled.*
-    ///
-    /// # Syntax tree enums
-    ///
-    /// This type is a syntax tree enum. In Syn this and other syntax tree enums
-    /// are designed to be traversed using the following rebinding idiom.
-    ///
-    /// ```
-    /// # use syn::Expr;
-    /// #
-    /// # fn example(expr: Expr) {
-    /// # const IGNORE: &str = stringify! {
-    /// let expr: Expr = /* ... */;
-    /// # };
-    /// match expr {
-    ///     Expr::MethodCall(expr) => {
-    ///         /* ... */
-    ///     }
-    ///     Expr::Cast(expr) => {
-    ///         /* ... */
-    ///     }
-    ///     Expr::If(expr) => {
-    ///         /* ... */
-    ///     }
-    ///
-    ///     /* ... */
-    ///     # _ => {}
-    /// # }
-    /// # }
-    /// ```
-    ///
-    /// We begin with a variable `expr` of type `Expr` that has no fields
-    /// (because it is an enum), and by matching on it and rebinding a variable
-    /// with the same name `expr` we effectively imbue our variable with all of
-    /// the data fields provided by the variant that it turned out to be. So for
-    /// example above if we ended up in the `MethodCall` case then we get to use
-    /// `expr.receiver`, `expr.args` etc; if we ended up in the `If` case we get
-    /// to use `expr.cond`, `expr.then_branch`, `expr.else_branch`.
-    ///
-    /// This approach avoids repeating the variant names twice on every line.
-    ///
-    /// ```
-    /// # use syn::{Expr, ExprMethodCall};
-    /// #
-    /// # fn example(expr: Expr) {
-    /// // Repetitive; recommend not doing this.
-    /// match expr {
-    ///     Expr::MethodCall(ExprMethodCall { method, args, .. }) => {
-    /// # }
-    /// # _ => {}
-    /// # }
-    /// # }
-    /// ```
-    ///
-    /// In general, the name to which a syntax tree enum variant is bound should
-    /// be a suitable name for the complete syntax tree enum type.
-    ///
-    /// ```
-    /// # use syn::{Expr, ExprField};
-    /// #
-    /// # fn example(discriminant: ExprField) {
-    /// // Binding is called `base` which is the name I would use if I were
-    /// // assigning `*discriminant.base` without an `if let`.
-    /// if let Expr::Tuple(base) = *discriminant.base {
-    /// # }
-    /// # }
-    /// ```
-    ///
-    /// A sign that you may not be choosing the right variable names is if you
-    /// see names getting repeated in your code, like accessing
-    /// `receiver.receiver` or `pat.pat` or `cond.cond`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    #[non_exhaustive]
-    pub enum Expr {
-        /// A slice literal expression: `[a, b, c, d]`.
-        Array(ExprArray),
-
-        /// An assignment expression: `a = compute()`.
-        Assign(ExprAssign),
-
-        /// An async block: `async { ... }`.
-        Async(ExprAsync),
-
-        /// An await expression: `fut.await`.
-        Await(ExprAwait),
-
-        /// A binary operation: `a + b`, `a += b`.
-        Binary(ExprBinary),
-
-        /// A blocked scope: `{ ... }`.
-        Block(ExprBlock),
-
-        /// A `break`, with an optional label to break and an optional
-        /// expression.
-        Break(ExprBreak),
-
-        /// A function call expression: `invoke(a, b)`.
-        Call(ExprCall),
-
-        /// A cast expression: `foo as f64`.
-        Cast(ExprCast),
-
-        /// A closure expression: `|a, b| a + b`.
-        Closure(ExprClosure),
-
-        /// A const block: `const { ... }`.
-        Const(ExprConst),
-
-        /// A `continue`, with an optional label.
-        Continue(ExprContinue),
-
-        /// Access of a named struct field (`obj.k`) or unnamed tuple struct
-        /// field (`obj.0`).
-        Field(ExprField),
-
-        /// A for loop: `for pat in expr { ... }`.
-        ForLoop(ExprForLoop),
-
-        /// An expression contained within invisible delimiters.
-        ///
-        /// This variant is important for faithfully representing the precedence
-        /// of expressions and is related to `None`-delimited spans in a
-        /// `TokenStream`.
-        Group(ExprGroup),
-
-        /// An `if` expression with an optional `else` block: `if expr { ... }
-        /// else { ... }`.
-        ///
-        /// The `else` branch expression may only be an `If` or `Block`
-        /// expression, not any of the other types of expression.
-        If(ExprIf),
-
-        /// A square bracketed indexing expression: `vector[2]`.
-        Index(ExprIndex),
-
-        /// The inferred value of a const generic argument, denoted `_`.
-        Infer(ExprInfer),
-
-        /// A `let` guard: `let Some(x) = opt`.
-        Let(ExprLet),
-
-        /// A literal in place of an expression: `1`, `"foo"`.
-        Lit(ExprLit),
-
-        /// Conditionless loop: `loop { ... }`.
-        Loop(ExprLoop),
-
-        /// A macro invocation expression: `format!("{}", q)`.
-        Macro(ExprMacro),
-
-        /// A `match` expression: `match n { Some(n) => {}, None => {} }`.
-        Match(ExprMatch),
-
-        /// A method call expression: `x.foo::<T>(a, b)`.
-        MethodCall(ExprMethodCall),
-
-        /// A parenthesized expression: `(a + b)`.
-        Paren(ExprParen),
-
-        /// A path like `std::mem::replace` possibly containing generic
-        /// parameters and a qualified self-type.
-        ///
-        /// A plain identifier like `x` is a path of length 1.
-        Path(ExprPath),
-
-        /// A range expression: `1..2`, `1..`, `..2`, `1..=2`, `..=2`.
-        Range(ExprRange),
-
-        /// A referencing operation: `&a` or `&mut a`.
-        Reference(ExprReference),
-
-        /// An array literal constructed from one repeated element: `[0u8; N]`.
-        Repeat(ExprRepeat),
-
-        /// A `return`, with an optional value to be returned.
-        Return(ExprReturn),
-
-        /// A struct literal expression: `Point { x: 1, y: 1 }`.
-        ///
-        /// The `rest` provides the value of the remaining fields as in `S { a:
-        /// 1, b: 1, ..rest }`.
-        Struct(ExprStruct),
-
-        /// A try-expression: `expr?`.
-        Try(ExprTry),
-
-        /// A try block: `try { ... }`.
-        TryBlock(ExprTryBlock),
-
-        /// A tuple expression: `(a, b, c, d)`.
-        Tuple(ExprTuple),
-
-        /// A unary operation: `!x`, `*x`.
-        Unary(ExprUnary),
-
-        /// An unsafe block: `unsafe { ... }`.
-        Unsafe(ExprUnsafe),
-
-        /// Tokens in expression position not interpreted by Syn.
-        Verbatim(TokenStream),
-
-        /// A while loop: `while expr { ... }`.
-        While(ExprWhile),
-
-        /// A yield expression: `yield expr`.
-        Yield(ExprYield),
-
-        // For testing exhaustiveness in downstream code, use the following idiom:
-        //
-        //     match expr {
-        //         #![cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
-        //
-        //         Expr::Array(expr) => {...}
-        //         Expr::Assign(expr) => {...}
-        //         ...
-        //         Expr::Yield(expr) => {...}
-        //
-        //         _ => { /* some sane fallback */ }
-        //     }
-        //
-        // This way we fail your tests but don't break your library when adding
-        // a variant. You will be notified by a test failure when a variant is
-        // added, so that you can add code to handle it, but your library will
-        // continue to compile and work for downstream users in the interim.
-    }
-}
-
-ast_struct! {
-    /// A slice literal expression: `[a, b, c, d]`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprArray #full {
-        pub attrs: Vec<Attribute>,
-        pub bracket_token: token::Bracket,
-        pub elems: Punctuated<Expr, Token![,]>,
-    }
-}
-
-ast_struct! {
-    /// An assignment expression: `a = compute()`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprAssign #full {
-        pub attrs: Vec<Attribute>,
-        pub left: Box<Expr>,
-        pub eq_token: Token![=],
-        pub right: Box<Expr>,
-    }
-}
-
-ast_struct! {
-    /// An async block: `async { ... }`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprAsync #full {
-        pub attrs: Vec<Attribute>,
-        pub async_token: Token![async],
-        pub capture: Option<Token![move]>,
-        pub block: Block,
-    }
-}
-
-ast_struct! {
-    /// An await expression: `fut.await`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprAwait #full {
-        pub attrs: Vec<Attribute>,
-        pub base: Box<Expr>,
-        pub dot_token: Token![.],
-        pub await_token: Token![await],
-    }
-}
-
-ast_struct! {
-    /// A binary operation: `a + b`, `a += b`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprBinary {
-        pub attrs: Vec<Attribute>,
-        pub left: Box<Expr>,
-        pub op: BinOp,
-        pub right: Box<Expr>,
-    }
-}
-
-ast_struct! {
-    /// A blocked scope: `{ ... }`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprBlock #full {
-        pub attrs: Vec<Attribute>,
-        pub label: Option<Label>,
-        pub block: Block,
-    }
-}
-
-ast_struct! {
-    /// A `break`, with an optional label to break and an optional
-    /// expression.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprBreak #full {
-        pub attrs: Vec<Attribute>,
-        pub break_token: Token![break],
-        pub label: Option<Lifetime>,
-        pub expr: Option<Box<Expr>>,
-    }
-}
-
-ast_struct! {
-    /// A function call expression: `invoke(a, b)`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprCall {
-        pub attrs: Vec<Attribute>,
-        pub func: Box<Expr>,
-        pub paren_token: token::Paren,
-        pub args: Punctuated<Expr, Token![,]>,
-    }
-}
-
-ast_struct! {
-    /// A cast expression: `foo as f64`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprCast {
-        pub attrs: Vec<Attribute>,
-        pub expr: Box<Expr>,
-        pub as_token: Token![as],
-        pub ty: Box<Type>,
-    }
-}
-
-ast_struct! {
-    /// A closure expression: `|a, b| a + b`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprClosure #full {
-        pub attrs: Vec<Attribute>,
-        pub lifetimes: Option<BoundLifetimes>,
-        pub constness: Option<Token![const]>,
-        pub movability: Option<Token![static]>,
-        pub asyncness: Option<Token![async]>,
-        pub capture: Option<Token![move]>,
-        pub or1_token: Token![|],
-        pub inputs: Punctuated<Pat, Token![,]>,
-        pub or2_token: Token![|],
-        pub output: ReturnType,
-        pub body: Box<Expr>,
-    }
-}
-
-ast_struct! {
-    /// A const block: `const { ... }`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprConst #full {
-        pub attrs: Vec<Attribute>,
-        pub const_token: Token![const],
-        pub block: Block,
-    }
-}
-
-ast_struct! {
-    /// A `continue`, with an optional label.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprContinue #full {
-        pub attrs: Vec<Attribute>,
-        pub continue_token: Token![continue],
-        pub label: Option<Lifetime>,
-    }
-}
-
-ast_struct! {
-    /// Access of a named struct field (`obj.k`) or unnamed tuple struct
-    /// field (`obj.0`).
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprField {
-        pub attrs: Vec<Attribute>,
-        pub base: Box<Expr>,
-        pub dot_token: Token![.],
-        pub member: Member,
-    }
-}
-
-ast_struct! {
-    /// A for loop: `for pat in expr { ... }`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprForLoop #full {
-        pub attrs: Vec<Attribute>,
-        pub label: Option<Label>,
-        pub for_token: Token![for],
-        pub pat: Box<Pat>,
-        pub in_token: Token![in],
-        pub expr: Box<Expr>,
-        pub body: Block,
-    }
-}
-
-ast_struct! {
-    /// An expression contained within invisible delimiters.
-    ///
-    /// This variant is important for faithfully representing the precedence
-    /// of expressions and is related to `None`-delimited spans in a
-    /// `TokenStream`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprGroup {
-        pub attrs: Vec<Attribute>,
-        pub group_token: token::Group,
-        pub expr: Box<Expr>,
-    }
-}
-
-ast_struct! {
-    /// An `if` expression with an optional `else` block: `if expr { ... }
-    /// else { ... }`.
-    ///
-    /// The `else` branch expression may only be an `If` or `Block`
-    /// expression, not any of the other types of expression.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprIf #full {
-        pub attrs: Vec<Attribute>,
-        pub if_token: Token![if],
-        pub cond: Box<Expr>,
-        pub then_branch: Block,
-        pub else_branch: Option<(Token![else], Box<Expr>)>,
-    }
-}
-
-ast_struct! {
-    /// A square bracketed indexing expression: `vector[2]`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprIndex {
-        pub attrs: Vec<Attribute>,
-        pub expr: Box<Expr>,
-        pub bracket_token: token::Bracket,
-        pub index: Box<Expr>,
-    }
-}
-
-ast_struct! {
-    /// The inferred value of a const generic argument, denoted `_`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprInfer #full {
-        pub attrs: Vec<Attribute>,
-        pub underscore_token: Token![_],
-    }
-}
-
-ast_struct! {
-    /// A `let` guard: `let Some(x) = opt`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprLet #full {
-        pub attrs: Vec<Attribute>,
-        pub let_token: Token![let],
-        pub pat: Box<Pat>,
-        pub eq_token: Token![=],
-        pub expr: Box<Expr>,
-    }
-}
-
-ast_struct! {
-    /// A literal in place of an expression: `1`, `"foo"`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprLit {
-        pub attrs: Vec<Attribute>,
-        pub lit: Lit,
-    }
-}
-
-ast_struct! {
-    /// Conditionless loop: `loop { ... }`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprLoop #full {
-        pub attrs: Vec<Attribute>,
-        pub label: Option<Label>,
-        pub loop_token: Token![loop],
-        pub body: Block,
-    }
-}
-
-ast_struct! {
-    /// A macro invocation expression: `format!("{}", q)`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprMacro {
-        pub attrs: Vec<Attribute>,
-        pub mac: Macro,
-    }
-}
-
-ast_struct! {
-    /// A `match` expression: `match n { Some(n) => {}, None => {} }`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprMatch #full {
-        pub attrs: Vec<Attribute>,
-        pub match_token: Token![match],
-        pub expr: Box<Expr>,
-        pub brace_token: token::Brace,
-        pub arms: Vec<Arm>,
-    }
-}
-
-ast_struct! {
-    /// A method call expression: `x.foo::<T>(a, b)`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprMethodCall {
-        pub attrs: Vec<Attribute>,
-        pub receiver: Box<Expr>,
-        pub dot_token: Token![.],
-        pub method: Ident,
-        pub turbofish: Option<AngleBracketedGenericArguments>,
-        pub paren_token: token::Paren,
-        pub args: Punctuated<Expr, Token![,]>,
-    }
-}
-
-ast_struct! {
-    /// A parenthesized expression: `(a + b)`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprParen {
-        pub attrs: Vec<Attribute>,
-        pub paren_token: token::Paren,
-        pub expr: Box<Expr>,
-    }
-}
-
-ast_struct! {
-    /// A path like `std::mem::replace` possibly containing generic
-    /// parameters and a qualified self-type.
-    ///
-    /// A plain identifier like `x` is a path of length 1.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprPath {
-        pub attrs: Vec<Attribute>,
-        pub qself: Option<QSelf>,
-        pub path: Path,
-    }
-}
-
-ast_struct! {
-    /// A range expression: `1..2`, `1..`, `..2`, `1..=2`, `..=2`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprRange #full {
-        pub attrs: Vec<Attribute>,
-        pub start: Option<Box<Expr>>,
-        pub limits: RangeLimits,
-        pub end: Option<Box<Expr>>,
-    }
-}
-
-ast_struct! {
-    /// A referencing operation: `&a` or `&mut a`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprReference {
-        pub attrs: Vec<Attribute>,
-        pub and_token: Token![&],
-        pub mutability: Option<Token![mut]>,
-        pub expr: Box<Expr>,
-    }
-}
-
-ast_struct! {
-    /// An array literal constructed from one repeated element: `[0u8; N]`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprRepeat #full {
-        pub attrs: Vec<Attribute>,
-        pub bracket_token: token::Bracket,
-        pub expr: Box<Expr>,
-        pub semi_token: Token![;],
-        pub len: Box<Expr>,
-    }
-}
-
-ast_struct! {
-    /// A `return`, with an optional value to be returned.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprReturn #full {
-        pub attrs: Vec<Attribute>,
-        pub return_token: Token![return],
-        pub expr: Option<Box<Expr>>,
-    }
-}
-
-ast_struct! {
-    /// A struct literal expression: `Point { x: 1, y: 1 }`.
-    ///
-    /// The `rest` provides the value of the remaining fields as in `S { a:
-    /// 1, b: 1, ..rest }`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprStruct {
-        pub attrs: Vec<Attribute>,
-        pub qself: Option<QSelf>,
-        pub path: Path,
-        pub brace_token: token::Brace,
-        pub fields: Punctuated<FieldValue, Token![,]>,
-        pub dot2_token: Option<Token![..]>,
-        pub rest: Option<Box<Expr>>,
-    }
-}
-
-ast_struct! {
-    /// A try-expression: `expr?`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprTry #full {
-        pub attrs: Vec<Attribute>,
-        pub expr: Box<Expr>,
-        pub question_token: Token![?],
-    }
-}
-
-ast_struct! {
-    /// A try block: `try { ... }`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprTryBlock #full {
-        pub attrs: Vec<Attribute>,
-        pub try_token: Token![try],
-        pub block: Block,
-    }
-}
-
-ast_struct! {
-    /// A tuple expression: `(a, b, c, d)`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprTuple #full {
-        pub attrs: Vec<Attribute>,
-        pub paren_token: token::Paren,
-        pub elems: Punctuated<Expr, Token![,]>,
-    }
-}
-
-ast_struct! {
-    /// A unary operation: `!x`, `*x`.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct ExprUnary {
-        pub attrs: Vec<Attribute>,
-        pub op: UnOp,
-        pub expr: Box<Expr>,
-    }
-}
-
-ast_struct! {
-    /// An unsafe block: `unsafe { ... }`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprUnsafe #full {
-        pub attrs: Vec<Attribute>,
-        pub unsafe_token: Token![unsafe],
-        pub block: Block,
-    }
-}
-
-ast_struct! {
-    /// A while loop: `while expr { ... }`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprWhile #full {
-        pub attrs: Vec<Attribute>,
-        pub label: Option<Label>,
-        pub while_token: Token![while],
-        pub cond: Box<Expr>,
-        pub body: Block,
-    }
-}
-
-ast_struct! {
-    /// A yield expression: `yield expr`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct ExprYield #full {
-        pub attrs: Vec<Attribute>,
-        pub yield_token: Token![yield],
-        pub expr: Option<Box<Expr>>,
-    }
-}
-
-impl Expr {
-    #[cfg(feature = "parsing")]
-    const DUMMY: Self = Expr::Path(ExprPath {
-        attrs: Vec::new(),
-        qself: None,
-        path: Path {
-            leading_colon: None,
-            segments: Punctuated::new(),
-        },
-    });
-
-    #[cfg(all(feature = "parsing", feature = "full"))]
-    pub(crate) fn replace_attrs(&mut self, new: Vec<Attribute>) -> Vec<Attribute> {
-        match self {
-            Expr::Array(ExprArray { attrs, .. })
-            | Expr::Assign(ExprAssign { attrs, .. })
-            | Expr::Async(ExprAsync { attrs, .. })
-            | Expr::Await(ExprAwait { attrs, .. })
-            | Expr::Binary(ExprBinary { attrs, .. })
-            | Expr::Block(ExprBlock { attrs, .. })
-            | Expr::Break(ExprBreak { attrs, .. })
-            | Expr::Call(ExprCall { attrs, .. })
-            | Expr::Cast(ExprCast { attrs, .. })
-            | Expr::Closure(ExprClosure { attrs, .. })
-            | Expr::Const(ExprConst { attrs, .. })
-            | Expr::Continue(ExprContinue { attrs, .. })
-            | Expr::Field(ExprField { attrs, .. })
-            | Expr::ForLoop(ExprForLoop { attrs, .. })
-            | Expr::Group(ExprGroup { attrs, .. })
-            | Expr::If(ExprIf { attrs, .. })
-            | Expr::Index(ExprIndex { attrs, .. })
-            | Expr::Infer(ExprInfer { attrs, .. })
-            | Expr::Let(ExprLet { attrs, .. })
-            | Expr::Lit(ExprLit { attrs, .. })
-            | Expr::Loop(ExprLoop { attrs, .. })
-            | Expr::Macro(ExprMacro { attrs, .. })
-            | Expr::Match(ExprMatch { attrs, .. })
-            | Expr::MethodCall(ExprMethodCall { attrs, .. })
-            | Expr::Paren(ExprParen { attrs, .. })
-            | Expr::Path(ExprPath { attrs, .. })
-            | Expr::Range(ExprRange { attrs, .. })
-            | Expr::Reference(ExprReference { attrs, .. })
-            | Expr::Repeat(ExprRepeat { attrs, .. })
-            | Expr::Return(ExprReturn { attrs, .. })
-            | Expr::Struct(ExprStruct { attrs, .. })
-            | Expr::Try(ExprTry { attrs, .. })
-            | Expr::TryBlock(ExprTryBlock { attrs, .. })
-            | Expr::Tuple(ExprTuple { attrs, .. })
-            | Expr::Unary(ExprUnary { attrs, .. })
-            | Expr::Unsafe(ExprUnsafe { attrs, .. })
-            | Expr::While(ExprWhile { attrs, .. })
-            | Expr::Yield(ExprYield { attrs, .. }) => mem::replace(attrs, new),
-            Expr::Verbatim(_) => Vec::new(),
-        }
-    }
-}
-
-ast_enum! {
-    /// A struct or tuple struct field accessed in a struct literal or field
-    /// expression.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub enum Member {
-        /// A named field like `self.x`.
-        Named(Ident),
-        /// An unnamed field like `self.0`.
-        Unnamed(Index),
-    }
-}
-
-impl From<Ident> for Member {
-    fn from(ident: Ident) -> Member {
-        Member::Named(ident)
-    }
-}
-
-impl From<Index> for Member {
-    fn from(index: Index) -> Member {
-        Member::Unnamed(index)
-    }
-}
-
-impl From<usize> for Member {
-    fn from(index: usize) -> Member {
-        Member::Unnamed(Index::from(index))
-    }
-}
-
-impl Eq for Member {}
-
-impl PartialEq for Member {
-    fn eq(&self, other: &Self) -> bool {
-        match (self, other) {
-            (Member::Named(this), Member::Named(other)) => this == other,
-            (Member::Unnamed(this), Member::Unnamed(other)) => this == other,
-            _ => false,
-        }
-    }
-}
-
-impl Hash for Member {
-    fn hash<H: Hasher>(&self, state: &mut H) {
-        match self {
-            Member::Named(m) => m.hash(state),
-            Member::Unnamed(m) => m.hash(state),
-        }
-    }
-}
-
-#[cfg(feature = "printing")]
-impl IdentFragment for Member {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        match self {
-            Member::Named(m) => Display::fmt(m, formatter),
-            Member::Unnamed(m) => Display::fmt(&m.index, formatter),
-        }
-    }
-
-    fn span(&self) -> Option<Span> {
-        match self {
-            Member::Named(m) => Some(m.span()),
-            Member::Unnamed(m) => Some(m.span),
-        }
-    }
-}
-
-ast_struct! {
-    /// The index of an unnamed tuple struct field.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct Index {
-        pub index: u32,
-        pub span: Span,
-    }
-}
-
-impl From<usize> for Index {
-    fn from(index: usize) -> Index {
-        assert!(index < u32::max_value() as usize);
-        Index {
-            index: index as u32,
-            span: Span::call_site(),
-        }
-    }
-}
-
-impl Eq for Index {}
-
-impl PartialEq for Index {
-    fn eq(&self, other: &Self) -> bool {
-        self.index == other.index
-    }
-}
-
-impl Hash for Index {
-    fn hash<H: Hasher>(&self, state: &mut H) {
-        self.index.hash(state);
-    }
-}
-
-#[cfg(feature = "printing")]
-impl IdentFragment for Index {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        Display::fmt(&self.index, formatter)
-    }
-
-    fn span(&self) -> Option<Span> {
-        Some(self.span)
-    }
-}
-
-ast_struct! {
-    /// A field-value pair in a struct literal.
-    #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
-    pub struct FieldValue {
-        pub attrs: Vec<Attribute>,
-        pub member: Member,
-
-        /// The colon in `Struct { x: x }`. If written in shorthand like
-        /// `Struct { x }`, there is no colon.
-        pub colon_token: Option<Token![:]>,
-
-        pub expr: Expr,
-    }
-}
-
-#[cfg(feature = "full")]
-ast_struct! {
-    /// A lifetime labeling a `for`, `while`, or `loop`.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct Label {
-        pub name: Lifetime,
-        pub colon_token: Token![:],
-    }
-}
-
-#[cfg(feature = "full")]
-ast_struct! {
-    /// One arm of a `match` expression: `0..=10 => { return true; }`.
-    ///
-    /// As in:
-    ///
-    /// ```
-    /// # fn f() -> bool {
-    /// #     let n = 0;
-    /// match n {
-    ///     0..=10 => {
-    ///         return true;
-    ///     }
-    ///     // ...
-    ///     # _ => {}
-    /// }
-    /// #   false
-    /// # }
-    /// ```
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub struct Arm {
-        pub attrs: Vec<Attribute>,
-        pub pat: Pat,
-        pub guard: Option<(Token![if], Box<Expr>)>,
-        pub fat_arrow_token: Token![=>],
-        pub body: Box<Expr>,
-        pub comma: Option<Token![,]>,
-    }
-}
-
-#[cfg(feature = "full")]
-ast_enum! {
-    /// Limit types of a range, inclusive or exclusive.
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "full")))]
-    pub enum RangeLimits {
-        /// Inclusive at the beginning, exclusive at the end.
-        HalfOpen(Token![..]),
-        /// Inclusive at the beginning and end.
-        Closed(Token![..=]),
-    }
-}
-
-#[cfg(any(feature = "parsing", feature = "printing"))]
-#[cfg(feature = "full")]
-pub(crate) fn requires_terminator(expr: &Expr) -> bool {
-    // see https://github.com/rust-lang/rust/blob/9a19e7604/compiler/rustc_ast/src/util/classify.rs#L7-L26
-    match expr {
-        Expr::If(_)
-        | Expr::Match(_)
-        | Expr::Block(_) | Expr::Unsafe(_) // both under ExprKind::Block in rustc
-        | Expr::While(_)
-        | Expr::Loop(_)
-        | Expr::ForLoop(_)
-        | Expr::TryBlock(_)
-        | Expr::Const(_) => false,
-        Expr::Array(_)
-        | Expr::Assign(_)
-        | Expr::Async(_)
-        | Expr::Await(_)
-        | Expr::Binary(_)
-        | Expr::Break(_)
-        | Expr::Call(_)
-        | Expr::Cast(_)
-        | Expr::Closure(_)
-        | Expr::Continue(_)
-        | Expr::Field(_)
-        | Expr::Group(_)
-        | Expr::Index(_)
-        | Expr::Infer(_)
-        | Expr::Let(_)
-        | Expr::Lit(_)
-        | Expr::Macro(_)
-        | Expr::MethodCall(_)
-        | Expr::Paren(_)
-        | Expr::Path(_)
-        | Expr::Range(_)
-        | Expr::Reference(_)
-        | Expr::Repeat(_)
-        | Expr::Return(_)
-        | Expr::Struct(_)
-        | Expr::Try(_)
-        | Expr::Tuple(_)
-        | Expr::Unary(_)
-        | Expr::Yield(_)
-        | Expr::Verbatim(_) => true
-    }
-}
-
-#[cfg(feature = "parsing")]
-mod precedence {
-    use super::BinOp;
-
-    pub(crate) enum Precedence {
-        Any,
-        Assign,
-        Range,
-        Or,
-        And,
-        Compare,
-        BitOr,
-        BitXor,
-        BitAnd,
-        Shift,
-        Arithmetic,
-        Term,
-        Cast,
-    }
-
-    impl Precedence {
-        pub(crate) fn of(op: &BinOp) -> Self {
-            match op {
-                BinOp::Add(_) | BinOp::Sub(_) => Precedence::Arithmetic,
-                BinOp::Mul(_) | BinOp::Div(_) | BinOp::Rem(_) => Precedence::Term,
-                BinOp::And(_) => Precedence::And,
-                BinOp::Or(_) => Precedence::Or,
-                BinOp::BitXor(_) => Precedence::BitXor,
-                BinOp::BitAnd(_) => Precedence::BitAnd,
-                BinOp::BitOr(_) => Precedence::BitOr,
-                BinOp::Shl(_) | BinOp::Shr(_) => Precedence::Shift,
-                BinOp::Eq(_)
-                | BinOp::Lt(_)
-                | BinOp::Le(_)
-                | BinOp::Ne(_)
-                | BinOp::Ge(_)
-                | BinOp::Gt(_) => Precedence::Compare,
-                BinOp::AddAssign(_)
-                | BinOp::SubAssign(_)
-                | BinOp::MulAssign(_)
-                | BinOp::DivAssign(_)
-                | BinOp::RemAssign(_)
-                | BinOp::BitXorAssign(_)
-                | BinOp::BitAndAssign(_)
-                | BinOp::BitOrAssign(_)
-                | BinOp::ShlAssign(_)
-                | BinOp::ShrAssign(_) => Precedence::Assign,
-            }
-        }
-    }
-}
-
-#[cfg(feature = "parsing")]
-pub(crate) mod parsing {
-    use super::precedence::Precedence;
-    use super::*;
-    #[cfg(feature = "full")]
-    use crate::ext::IdentExt as _;
-    use crate::parse::discouraged::Speculative as _;
-    #[cfg(feature = "full")]
-    use crate::parse::ParseBuffer;
-    use crate::parse::{Parse, ParseStream, Result};
-    use crate::path;
-    use std::cmp::Ordering;
-
-    mod kw {
-        crate::custom_keyword!(builtin);
-        crate::custom_keyword!(raw);
-    }
-
-    // When we're parsing expressions which occur before blocks, like in an if
-    // statement's condition, we cannot parse a struct literal.
-    //
-    // Struct literals are ambiguous in certain positions
-    // https://github.com/rust-lang/rfcs/pull/92
-    #[cfg(feature = "full")]
-    pub(crate) struct AllowStruct(bool);
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for Expr {
-        fn parse(input: ParseStream) -> Result<Self> {
-            ambiguous_expr(
-                input,
-                #[cfg(feature = "full")]
-                AllowStruct(true),
-            )
-        }
-    }
-
-    impl Expr {
-        /// An alternative to the primary `Expr::parse` parser (from the
-        /// [`Parse`] trait) for ambiguous syntactic positions in which a
-        /// trailing brace should not be taken as part of the expression.
-        ///
-        /// Rust grammar has an ambiguity where braces sometimes turn a path
-        /// expression into a struct initialization and sometimes do not. In the
-        /// following code, the expression `S {}` is one expression. Presumably
-        /// there is an empty struct `struct S {}` defined somewhere which it is
-        /// instantiating.
-        ///
-        /// ```
-        /// # struct S;
-        /// # impl std::ops::Deref for S {
-        /// #     type Target = bool;
-        /// #     fn deref(&self) -> &Self::Target {
-        /// #         &true
-        /// #     }
-        /// # }
-        /// let _ = *S {};
-        ///
-        /// // parsed by rustc as: `*(S {})`
-        /// ```
-        ///
-        /// We would want to parse the above using `Expr::parse` after the `=`
-        /// token.
-        ///
-        /// But in the following, `S {}` is *not* a struct init expression.
-        ///
-        /// ```
-        /// # const S: &bool = &true;
-        /// if *S {} {}
-        ///
-        /// // parsed by rustc as:
-        /// //
-        /// //    if (*S) {
-        /// //        /* empty block */
-        /// //    }
-        /// //    {
-        /// //        /* another empty block */
-        /// //    }
-        /// ```
-        ///
-        /// For that reason we would want to parse if-conditions using
-        /// `Expr::parse_without_eager_brace` after the `if` token. Same for
-        /// similar syntactic positions such as the condition expr after a
-        /// `while` token or the expr at the top of a `match`.
-        ///
-        /// The Rust grammar's choices around which way this ambiguity is
-        /// resolved at various syntactic positions is fairly arbitrary. Really
-        /// either parse behavior could work in most positions, and language
-        /// designers just decide each case based on which is more likely to be
-        /// what the programmer had in mind most of the time.
-        ///
-        /// ```
-        /// # struct S;
-        /// # fn doc() -> S {
-        /// if return S {} {}
-        /// # unreachable!()
-        /// # }
-        ///
-        /// // parsed by rustc as:
-        /// //
-        /// //    if (return (S {})) {
-        /// //    }
-        /// //
-        /// // but could equally well have been this other arbitrary choice:
-        /// //
-        /// //    if (return S) {
-        /// //    }
-        /// //    {}
-        /// ```
-        ///
-        /// Note the grammar ambiguity on trailing braces is distinct from
-        /// precedence and is not captured by assigning a precedence level to
-        /// the braced struct init expr in relation to other operators. This can
-        /// be illustrated by `return 0..S {}` vs `match 0..S {}`. The former
-        /// parses as `return (0..(S {}))` implying tighter precedence for
-        /// struct init than `..`, while the latter parses as `match (0..S) {}`
-        /// implying tighter precedence for `..` than struct init, a
-        /// contradiction.
-        #[cfg(feature = "full")]
-        #[cfg_attr(doc_cfg, doc(cfg(all(feature = "full", feature = "parsing"))))]
-        pub fn parse_without_eager_brace(input: ParseStream) -> Result<Expr> {
-            ambiguous_expr(input, AllowStruct(false))
-        }
-    }
-
-    #[cfg(feature = "full")]
-    impl Copy for AllowStruct {}
-
-    #[cfg(feature = "full")]
-    impl Clone for AllowStruct {
-        fn clone(&self) -> Self {
-            *self
-        }
-    }
-
-    impl Copy for Precedence {}
-
-    impl Clone for Precedence {
-        fn clone(&self) -> Self {
-            *self
-        }
-    }
-
-    impl PartialEq for Precedence {
-        fn eq(&self, other: &Self) -> bool {
-            *self as u8 == *other as u8
-        }
-    }
-
-    impl PartialOrd for Precedence {
-        fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-            let this = *self as u8;
-            let other = *other as u8;
-            Some(this.cmp(&other))
-        }
-    }
-
-    #[cfg(feature = "full")]
-    fn can_begin_expr(input: ParseStream) -> bool {
-        input.peek(Ident::peek_any) // value name or keyword
-            || input.peek(token::Paren) // tuple
-            || input.peek(token::Bracket) // array
-            || input.peek(token::Brace) // block
-            || input.peek(Lit) // literal
-            || input.peek(Token![!]) && !input.peek(Token![!=]) // operator not
-            || input.peek(Token![-]) && !input.peek(Token![-=]) && !input.peek(Token![->]) // unary minus
-            || input.peek(Token![*]) && !input.peek(Token![*=]) // dereference
-            || input.peek(Token![|]) && !input.peek(Token![|=]) // closure
-            || input.peek(Token![&]) && !input.peek(Token![&=]) // reference
-            || input.peek(Token![..]) // range notation
-            || input.peek(Token![<]) && !input.peek(Token![<=]) && !input.peek(Token![<<=]) // associated path
-            || input.peek(Token![::]) // global path
-            || input.peek(Lifetime) // labeled loop
-            || input.peek(Token![#]) // expression attributes
-    }
-
-    #[cfg(feature = "full")]
-    fn parse_expr(
-        input: ParseStream,
-        mut lhs: Expr,
-        allow_struct: AllowStruct,
-        base: Precedence,
-    ) -> Result<Expr> {
-        loop {
-            let ahead = input.fork();
-            if let Some(op) = match ahead.parse::<BinOp>() {
-                Ok(op) if Precedence::of(&op) >= base => Some(op),
-                _ => None,
-            } {
-                input.advance_to(&ahead);
-                let precedence = Precedence::of(&op);
-                let mut rhs = unary_expr(input, allow_struct)?;
-                loop {
-                    let next = peek_precedence(input);
-                    if next > precedence || next == precedence && precedence == Precedence::Assign {
-                        rhs = parse_expr(input, rhs, allow_struct, next)?;
-                    } else {
-                        break;
-                    }
-                }
-                lhs = Expr::Binary(ExprBinary {
-                    attrs: Vec::new(),
-                    left: Box::new(lhs),
-                    op,
-                    right: Box::new(rhs),
-                });
-            } else if Precedence::Assign >= base
-                && input.peek(Token![=])
-                && !input.peek(Token![==])
-                && !input.peek(Token![=>])
-            {
-                let eq_token: Token![=] = input.parse()?;
-                let mut rhs = unary_expr(input, allow_struct)?;
-                loop {
-                    let next = peek_precedence(input);
-                    if next >= Precedence::Assign {
-                        rhs = parse_expr(input, rhs, allow_struct, next)?;
-                    } else {
-                        break;
-                    }
-                }
-                lhs = Expr::Assign(ExprAssign {
-                    attrs: Vec::new(),
-                    left: Box::new(lhs),
-                    eq_token,
-                    right: Box::new(rhs),
-                });
-            } else if Precedence::Range >= base && input.peek(Token![..]) {
-                let limits: RangeLimits = input.parse()?;
-                let rhs = if matches!(limits, RangeLimits::HalfOpen(_))
-                    && (input.is_empty()
-                        || input.peek(Token![,])
-                        || input.peek(Token![;])
-                        || input.peek(Token![.]) && !input.peek(Token![..])
-                        || !allow_struct.0 && input.peek(token::Brace))
-                {
-                    None
-                } else {
-                    let mut rhs = unary_expr(input, allow_struct)?;
-                    loop {
-                        let next = peek_precedence(input);
-                        if next > Precedence::Range {
-                            rhs = parse_expr(input, rhs, allow_struct, next)?;
-                        } else {
-                            break;
-                        }
-                    }
-                    Some(rhs)
-                };
-                lhs = Expr::Range(ExprRange {
-                    attrs: Vec::new(),
-                    start: Some(Box::new(lhs)),
-                    limits,
-                    end: rhs.map(Box::new),
-                });
-            } else if Precedence::Cast >= base && input.peek(Token![as]) {
-                let as_token: Token![as] = input.parse()?;
-                let allow_plus = false;
-                let allow_group_generic = false;
-                let ty = ty::parsing::ambig_ty(input, allow_plus, allow_group_generic)?;
-                check_cast(input)?;
-                lhs = Expr::Cast(ExprCast {
-                    attrs: Vec::new(),
-                    expr: Box::new(lhs),
-                    as_token,
-                    ty: Box::new(ty),
-                });
-            } else {
-                break;
-            }
-        }
-        Ok(lhs)
-    }
-
-    #[cfg(not(feature = "full"))]
-    fn parse_expr(input: ParseStream, mut lhs: Expr, base: Precedence) -> Result<Expr> {
-        loop {
-            let ahead = input.fork();
-            if let Some(op) = match ahead.parse::<BinOp>() {
-                Ok(op) if Precedence::of(&op) >= base => Some(op),
-                _ => None,
-            } {
-                input.advance_to(&ahead);
-                let precedence = Precedence::of(&op);
-                let mut rhs = unary_expr(input)?;
-                loop {
-                    let next = peek_precedence(input);
-                    if next > precedence || next == precedence && precedence == Precedence::Assign {
-                        rhs = parse_expr(input, rhs, next)?;
-                    } else {
-                        break;
-                    }
-                }
-                lhs = Expr::Binary(ExprBinary {
-                    attrs: Vec::new(),
-                    left: Box::new(lhs),
-                    op,
-                    right: Box::new(rhs),
-                });
-            } else if Precedence::Cast >= base && input.peek(Token![as]) {
-                let as_token: Token![as] = input.parse()?;
-                let allow_plus = false;
-                let allow_group_generic = false;
-                let ty = ty::parsing::ambig_ty(input, allow_plus, allow_group_generic)?;
-                check_cast(input)?;
-                lhs = Expr::Cast(ExprCast {
-                    attrs: Vec::new(),
-                    expr: Box::new(lhs),
-                    as_token,
-                    ty: Box::new(ty),
-                });
-            } else {
-                break;
-            }
-        }
-        Ok(lhs)
-    }
-
-    fn peek_precedence(input: ParseStream) -> Precedence {
-        if let Ok(op) = input.fork().parse() {
-            Precedence::of(&op)
-        } else if input.peek(Token![=]) && !input.peek(Token![=>]) {
-            Precedence::Assign
-        } else if input.peek(Token![..]) {
-            Precedence::Range
-        } else if input.peek(Token![as]) {
-            Precedence::Cast
-        } else {
-            Precedence::Any
-        }
-    }
-
-    // Parse an arbitrary expression.
-    fn ambiguous_expr(
-        input: ParseStream,
-        #[cfg(feature = "full")] allow_struct: AllowStruct,
-    ) -> Result<Expr> {
-        let lhs = unary_expr(
-            input,
-            #[cfg(feature = "full")]
-            allow_struct,
-        )?;
-        parse_expr(
-            input,
-            lhs,
-            #[cfg(feature = "full")]
-            allow_struct,
-            Precedence::Any,
-        )
-    }
-
-    #[cfg(feature = "full")]
-    fn expr_attrs(input: ParseStream) -> Result<Vec<Attribute>> {
-        let mut attrs = Vec::new();
-        while !input.peek(token::Group) && input.peek(Token![#]) {
-            attrs.push(input.call(attr::parsing::single_parse_outer)?);
-        }
-        Ok(attrs)
-    }
-
-    // <UnOp> <trailer>
-    // & <trailer>
-    // &mut <trailer>
-    // box <trailer>
-    #[cfg(feature = "full")]
-    fn unary_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> {
-        let begin = input.fork();
-        let attrs = input.call(expr_attrs)?;
-        if input.peek(token::Group) {
-            return trailer_expr(begin, attrs, input, allow_struct);
-        }
-
-        if input.peek(Token![&]) {
-            let and_token: Token![&] = input.parse()?;
-            let raw: Option<kw::raw> = if input.peek(kw::raw)
-                && (input.peek2(Token![mut]) || input.peek2(Token![const]))
-            {
-                Some(input.parse()?)
-            } else {
-                None
-            };
-            let mutability: Option<Token![mut]> = input.parse()?;
-            if raw.is_some() && mutability.is_none() {
-                input.parse::<Token![const]>()?;
-            }
-            let expr = Box::new(unary_expr(input, allow_struct)?);
-            if raw.is_some() {
-                Ok(Expr::Verbatim(verbatim::between(&begin, input)))
-            } else {
-                Ok(Expr::Reference(ExprReference {
-                    attrs,
-                    and_token,
-                    mutability,
-                    expr,
-                }))
-            }
-        } else if input.peek(Token![*]) || input.peek(Token![!]) || input.peek(Token![-]) {
-            expr_unary(input, attrs, allow_struct).map(Expr::Unary)
-        } else {
-            trailer_expr(begin, attrs, input, allow_struct)
-        }
-    }
-
-    #[cfg(not(feature = "full"))]
-    fn unary_expr(input: ParseStream) -> Result<Expr> {
-        if input.peek(Token![&]) {
-            Ok(Expr::Reference(ExprReference {
-                attrs: Vec::new(),
-                and_token: input.parse()?,
-                mutability: input.parse()?,
-                expr: Box::new(unary_expr(input)?),
-            }))
-        } else if input.peek(Token![*]) || input.peek(Token![!]) || input.peek(Token![-]) {
-            Ok(Expr::Unary(ExprUnary {
-                attrs: Vec::new(),
-                op: input.parse()?,
-                expr: Box::new(unary_expr(input)?),
-            }))
-        } else {
-            trailer_expr(input)
-        }
-    }
-
-    // <atom> (..<args>) ...
-    // <atom> . <ident> (..<args>) ...
-    // <atom> . <ident> ...
-    // <atom> . <lit> ...
-    // <atom> [ <expr> ] ...
-    // <atom> ? ...
-    #[cfg(feature = "full")]
-    fn trailer_expr(
-        begin: ParseBuffer,
-        mut attrs: Vec<Attribute>,
-        input: ParseStream,
-        allow_struct: AllowStruct,
-    ) -> Result<Expr> {
-        let atom = atom_expr(input, allow_struct)?;
-        let mut e = trailer_helper(input, atom)?;
-
-        if let Expr::Verbatim(tokens) = &mut e {
-            *tokens = verbatim::between(&begin, input);
-        } else {
-            let inner_attrs = e.replace_attrs(Vec::new());
-            attrs.extend(inner_attrs);
-            e.replace_attrs(attrs);
-        }
-
-        Ok(e)
-    }
-
-    #[cfg(feature = "full")]
-    fn trailer_helper(input: ParseStream, mut e: Expr) -> Result<Expr> {
-        loop {
-            if input.peek(token::Paren) {
-                let content;
-                e = Expr::Call(ExprCall {
-                    attrs: Vec::new(),
-                    func: Box::new(e),
-                    paren_token: parenthesized!(content in input),
-                    args: content.parse_terminated(Expr::parse, Token![,])?,
-                });
-            } else if input.peek(Token![.])
-                && !input.peek(Token![..])
-                && match e {
-                    Expr::Range(_) => false,
-                    _ => true,
-                }
-            {
-                let mut dot_token: Token![.] = input.parse()?;
-
-                let float_token: Option<LitFloat> = input.parse()?;
-                if let Some(float_token) = float_token {
-                    if multi_index(&mut e, &mut dot_token, float_token)? {
-                        continue;
-                    }
-                }
-
-                let await_token: Option<Token![await]> = input.parse()?;
-                if let Some(await_token) = await_token {
-                    e = Expr::Await(ExprAwait {
-                        attrs: Vec::new(),
-                        base: Box::new(e),
-                        dot_token,
-                        await_token,
-                    });
-                    continue;
-                }
-
-                let member: Member = input.parse()?;
-                let turbofish = if member.is_named() && input.peek(Token![::]) {
-                    Some(AngleBracketedGenericArguments::parse_turbofish(input)?)
-                } else {
-                    None
-                };
-
-                if turbofish.is_some() || input.peek(token::Paren) {
-                    if let Member::Named(method) = member {
-                        let content;
-                        e = Expr::MethodCall(ExprMethodCall {
-                            attrs: Vec::new(),
-                            receiver: Box::new(e),
-                            dot_token,
-                            method,
-                            turbofish,
-                            paren_token: parenthesized!(content in input),
-                            args: content.parse_terminated(Expr::parse, Token![,])?,
-                        });
-                        continue;
-                    }
-                }
-
-                e = Expr::Field(ExprField {
-                    attrs: Vec::new(),
-                    base: Box::new(e),
-                    dot_token,
-                    member,
-                });
-            } else if input.peek(token::Bracket) {
-                let content;
-                e = Expr::Index(ExprIndex {
-                    attrs: Vec::new(),
-                    expr: Box::new(e),
-                    bracket_token: bracketed!(content in input),
-                    index: content.parse()?,
-                });
-            } else if input.peek(Token![?]) {
-                e = Expr::Try(ExprTry {
-                    attrs: Vec::new(),
-                    expr: Box::new(e),
-                    question_token: input.parse()?,
-                });
-            } else {
-                break;
-            }
-        }
-        Ok(e)
-    }
-
-    #[cfg(not(feature = "full"))]
-    fn trailer_expr(input: ParseStream) -> Result<Expr> {
-        let mut e = atom_expr(input)?;
-
-        loop {
-            if input.peek(token::Paren) {
-                let content;
-                e = Expr::Call(ExprCall {
-                    attrs: Vec::new(),
-                    func: Box::new(e),
-                    paren_token: parenthesized!(content in input),
-                    args: content.parse_terminated(Expr::parse, Token![,])?,
-                });
-            } else if input.peek(Token![.])
-                && !input.peek(Token![..])
-                && !input.peek2(Token![await])
-            {
-                let mut dot_token: Token![.] = input.parse()?;
-
-                let float_token: Option<LitFloat> = input.parse()?;
-                if let Some(float_token) = float_token {
-                    if multi_index(&mut e, &mut dot_token, float_token)? {
-                        continue;
-                    }
-                }
-
-                let member: Member = input.parse()?;
-                let turbofish = if member.is_named() && input.peek(Token![::]) {
-                    let colon2_token: Token![::] = input.parse()?;
-                    let turbofish =
-                        AngleBracketedGenericArguments::do_parse(Some(colon2_token), input)?;
-                    Some(turbofish)
-                } else {
-                    None
-                };
-
-                if turbofish.is_some() || input.peek(token::Paren) {
-                    if let Member::Named(method) = member {
-                        let content;
-                        e = Expr::MethodCall(ExprMethodCall {
-                            attrs: Vec::new(),
-                            receiver: Box::new(e),
-                            dot_token,
-                            method,
-                            turbofish,
-                            paren_token: parenthesized!(content in input),
-                            args: content.parse_terminated(Expr::parse, Token![,])?,
-                        });
-                        continue;
-                    }
-                }
-
-                e = Expr::Field(ExprField {
-                    attrs: Vec::new(),
-                    base: Box::new(e),
-                    dot_token,
-                    member,
-                });
-            } else if input.peek(token::Bracket) {
-                let content;
-                e = Expr::Index(ExprIndex {
-                    attrs: Vec::new(),
-                    expr: Box::new(e),
-                    bracket_token: bracketed!(content in input),
-                    index: content.parse()?,
-                });
-            } else {
-                break;
-            }
-        }
-
-        Ok(e)
-    }
-
-    // Parse all atomic expressions which don't have to worry about precedence
-    // interactions, as they are fully contained.
-    #[cfg(feature = "full")]
-    fn atom_expr(input: ParseStream, allow_struct: AllowStruct) -> Result<Expr> {
-        if input.peek(token::Group) {
-            expr_group(input, allow_struct)
-        } else if input.peek(Lit) {
-            input.parse().map(Expr::Lit)
-        } else if input.peek(Token![async])
-            && (input.peek2(token::Brace) || input.peek2(Token![move]) && input.peek3(token::Brace))
-        {
-            input.parse().map(Expr::Async)
-        } else if input.peek(Token![try]) && input.peek2(token::Brace) {
-            input.parse().map(Expr::TryBlock)
-        } else if input.peek(Token![|])
-            || input.peek(Token![move])
-            || input.peek(Token![for])
-                && input.peek2(Token![<])
-                && (input.peek3(Lifetime) || input.peek3(Token![>]))
-            || input.peek(Token![const]) && !input.peek2(token::Brace)
-            || input.peek(Token![static])
-            || input.peek(Token![async]) && (input.peek2(Token![|]) || input.peek2(Token![move]))
-        {
-            expr_closure(input, allow_struct).map(Expr::Closure)
-        } else if input.peek(kw::builtin) && input.peek2(Token![#]) {
-            expr_builtin(input)
-        } else if input.peek(Ident)
-            || input.peek(Token![::])
-            || input.peek(Token![<])
-            || input.peek(Token![self])
-            || input.peek(Token![Self])
-            || input.peek(Token![super])
-            || input.peek(Token![crate])
-            || input.peek(Token![try]) && (input.peek2(Token![!]) || input.peek2(Token![::]))
-        {
-            path_or_macro_or_struct(input, allow_struct)
-        } else if input.peek(token::Paren) {
-            paren_or_tuple(input)
-        } else if input.peek(Token![break]) {
-            expr_break(input, allow_struct).map(Expr::Break)
-        } else if input.peek(Token![continue]) {
-            input.parse().map(Expr::Continue)
-        } else if input.peek(Token![return]) {
-            expr_return(input, allow_struct).map(Expr::Return)
-        } else if input.peek(token::Bracket) {
-            array_or_repeat(input)
-        } else if input.peek(Token![let]) {
-            input.parse().map(Expr::Let)
-        } else if input.peek(Token![if]) {
-            input.parse().map(Expr::If)
-        } else if input.peek(Token![while]) {
-            input.parse().map(Expr::While)
-        } else if input.peek(Token![for]) {
-            input.parse().map(Expr::ForLoop)
-        } else if input.peek(Token![loop]) {
-            input.parse().map(Expr::Loop)
-        } else if input.peek(Token![match]) {
-            input.parse().map(Expr::Match)
-        } else if input.peek(Token![yield]) {
-            input.parse().map(Expr::Yield)
-        } else if input.peek(Token![unsafe]) {
-            input.parse().map(Expr::Unsafe)
-        } else if input.peek(Token![const]) {
-            input.parse().map(Expr::Const)
-        } else if input.peek(token::Brace) {
-            input.parse().map(Expr::Block)
-        } else if input.peek(Token![..]) {
-            expr_range(input, allow_struct).map(Expr::Range)
-        } else if input.peek(Token![_]) {
-            input.parse().map(Expr::Infer)
-        } else if input.peek(Lifetime) {
-            atom_labeled(input)
-        } else {
-            Err(input.error("expected an expression"))
-        }
-    }
-
-    #[cfg(feature = "full")]
-    fn atom_labeled(input: ParseStream) -> Result<Expr> {
-        let the_label: Label = input.parse()?;
-        let mut expr = if input.peek(Token![while]) {
-            Expr::While(input.parse()?)
-        } else if input.peek(Token![for]) {
-            Expr::ForLoop(input.parse()?)
-        } else if input.peek(Token![loop]) {
-            Expr::Loop(input.parse()?)
-        } else if input.peek(token::Brace) {
-            Expr::Block(input.parse()?)
-        } else {
-            return Err(input.error("expected loop or block expression"));
-        };
-        match &mut expr {
-            Expr::While(ExprWhile { label, .. })
-            | Expr::ForLoop(ExprForLoop { label, .. })
-            | Expr::Loop(ExprLoop { label, .. })
-            | Expr::Block(ExprBlock { label, .. }) => *label = Some(the_label),
-            _ => unreachable!(),
-        }
-        Ok(expr)
-    }
-
-    #[cfg(not(feature = "full"))]
-    fn atom_expr(input: ParseStream) -> Result<Expr> {
-        if input.peek(token::Group) {
-            expr_group(input)
-        } else if input.peek(Lit) {
-            input.parse().map(Expr::Lit)
-        } else if input.peek(token::Paren) {
-            input.call(expr_paren).map(Expr::Paren)
-        } else if input.peek(Ident)
-            || input.peek(Token![::])
-            || input.peek(Token![<])
-            || input.peek(Token![self])
-            || input.peek(Token![Self])
-            || input.peek(Token![super])
-            || input.peek(Token![crate])
-        {
-            path_or_macro_or_struct(input)
-        } else if input.is_empty() {
-            Err(input.error("expected an expression"))
-        } else {
-            if input.peek(token::Brace) {
-                let scan = input.fork();
-                let content;
-                braced!(content in scan);
-                if content.parse::<Expr>().is_ok() && content.is_empty() {
-                    let expr_block = verbatim::between(input, &scan);
-                    input.advance_to(&scan);
-                    return Ok(Expr::Verbatim(expr_block));
-                }
-            }
-            Err(input.error("unsupported expression; enable syn's features=[\"full\"]"))
-        }
-    }
-
-    #[cfg(feature = "full")]
-    fn expr_builtin(input: ParseStream) -> Result<Expr> {
-        let begin = input.fork();
-
-        input.parse::<kw::builtin>()?;
-        input.parse::<Token![#]>()?;
-        input.parse::<Ident>()?;
-
-        let args;
-        parenthesized!(args in input);
-        args.parse::<TokenStream>()?;
-
-        Ok(Expr::Verbatim(verbatim::between(&begin, input)))
-    }
-
-    fn path_or_macro_or_struct(
-        input: ParseStream,
-        #[cfg(feature = "full")] allow_struct: AllowStruct,
-    ) -> Result<Expr> {
-        let (qself, path) = path::parsing::qpath(input, true)?;
-        rest_of_path_or_macro_or_struct(
-            qself,
-            path,
-            input,
-            #[cfg(feature = "full")]
-            allow_struct,
-        )
-    }
-
-    fn rest_of_path_or_macro_or_struct(
-        qself: Option<QSelf>,
-        path: Path,
-        input: ParseStream,
-        #[cfg(feature = "full")] allow_struct: AllowStruct,
-    ) -> Result<Expr> {
-        if qself.is_none()
-            && input.peek(Token![!])
-            && !input.peek(Token![!=])
-            && path.is_mod_style()
-        {
-            let bang_token: Token![!] = input.parse()?;
-            let (delimiter, tokens) = mac::parse_delimiter(input)?;
-            return Ok(Expr::Macro(ExprMacro {
-                attrs: Vec::new(),
-                mac: Macro {
-                    path,
-                    bang_token,
-                    delimiter,
-                    tokens,
-                },
-            }));
-        }
-
-        #[cfg(not(feature = "full"))]
-        let allow_struct = (true,);
-        if allow_struct.0 && input.peek(token::Brace) {
-            return expr_struct_helper(input, qself, path).map(Expr::Struct);
-        }
-
-        Ok(Expr::Path(ExprPath {
-            attrs: Vec::new(),
-            qself,
-            path,
-        }))
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprMacro {
-        fn parse(input: ParseStream) -> Result<Self> {
-            Ok(ExprMacro {
-                attrs: Vec::new(),
-                mac: input.parse()?,
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    fn paren_or_tuple(input: ParseStream) -> Result<Expr> {
-        let content;
-        let paren_token = parenthesized!(content in input);
-        if content.is_empty() {
-            return Ok(Expr::Tuple(ExprTuple {
-                attrs: Vec::new(),
-                paren_token,
-                elems: Punctuated::new(),
-            }));
-        }
-
-        let first: Expr = content.parse()?;
-        if content.is_empty() {
-            return Ok(Expr::Paren(ExprParen {
-                attrs: Vec::new(),
-                paren_token,
-                expr: Box::new(first),
-            }));
-        }
-
-        let mut elems = Punctuated::new();
-        elems.push_value(first);
-        while !content.is_empty() {
-            let punct = content.parse()?;
-            elems.push_punct(punct);
-            if content.is_empty() {
-                break;
-            }
-            let value = content.parse()?;
-            elems.push_value(value);
-        }
-        Ok(Expr::Tuple(ExprTuple {
-            attrs: Vec::new(),
-            paren_token,
-            elems,
-        }))
-    }
-
-    #[cfg(feature = "full")]
-    fn array_or_repeat(input: ParseStream) -> Result<Expr> {
-        let content;
-        let bracket_token = bracketed!(content in input);
-        if content.is_empty() {
-            return Ok(Expr::Array(ExprArray {
-                attrs: Vec::new(),
-                bracket_token,
-                elems: Punctuated::new(),
-            }));
-        }
-
-        let first: Expr = content.parse()?;
-        if content.is_empty() || content.peek(Token![,]) {
-            let mut elems = Punctuated::new();
-            elems.push_value(first);
-            while !content.is_empty() {
-                let punct = content.parse()?;
-                elems.push_punct(punct);
-                if content.is_empty() {
-                    break;
-                }
-                let value = content.parse()?;
-                elems.push_value(value);
-            }
-            Ok(Expr::Array(ExprArray {
-                attrs: Vec::new(),
-                bracket_token,
-                elems,
-            }))
-        } else if content.peek(Token![;]) {
-            let semi_token: Token![;] = content.parse()?;
-            let len: Expr = content.parse()?;
-            Ok(Expr::Repeat(ExprRepeat {
-                attrs: Vec::new(),
-                bracket_token,
-                expr: Box::new(first),
-                semi_token,
-                len: Box::new(len),
-            }))
-        } else {
-            Err(content.error("expected `,` or `;`"))
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprArray {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let content;
-            let bracket_token = bracketed!(content in input);
-            let mut elems = Punctuated::new();
-
-            while !content.is_empty() {
-                let first: Expr = content.parse()?;
-                elems.push_value(first);
-                if content.is_empty() {
-                    break;
-                }
-                let punct = content.parse()?;
-                elems.push_punct(punct);
-            }
-
-            Ok(ExprArray {
-                attrs: Vec::new(),
-                bracket_token,
-                elems,
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprRepeat {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let content;
-            Ok(ExprRepeat {
-                bracket_token: bracketed!(content in input),
-                attrs: Vec::new(),
-                expr: content.parse()?,
-                semi_token: content.parse()?,
-                len: content.parse()?,
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    pub(crate) fn expr_early(input: ParseStream) -> Result<Expr> {
-        let mut attrs = input.call(expr_attrs)?;
-        let mut expr = if input.peek(token::Group) {
-            let allow_struct = AllowStruct(true);
-            let atom = expr_group(input, allow_struct)?;
-            if continue_parsing_early(&atom) {
-                trailer_helper(input, atom)?
-            } else {
-                atom
-            }
-        } else if input.peek(Token![if]) {
-            Expr::If(input.parse()?)
-        } else if input.peek(Token![while]) {
-            Expr::While(input.parse()?)
-        } else if input.peek(Token![for])
-            && !(input.peek2(Token![<]) && (input.peek3(Lifetime) || input.peek3(Token![>])))
-        {
-            Expr::ForLoop(input.parse()?)
-        } else if input.peek(Token![loop]) {
-            Expr::Loop(input.parse()?)
-        } else if input.peek(Token![match]) {
-            Expr::Match(input.parse()?)
-        } else if input.peek(Token![try]) && input.peek2(token::Brace) {
-            Expr::TryBlock(input.parse()?)
-        } else if input.peek(Token![unsafe]) {
-            Expr::Unsafe(input.parse()?)
-        } else if input.peek(Token![const]) && input.peek2(token::Brace) {
-            Expr::Const(input.parse()?)
-        } else if input.peek(token::Brace) {
-            Expr::Block(input.parse()?)
-        } else if input.peek(Lifetime) {
-            atom_labeled(input)?
-        } else {
-            let allow_struct = AllowStruct(true);
-            unary_expr(input, allow_struct)?
-        };
-
-        if continue_parsing_early(&expr) {
-            attrs.extend(expr.replace_attrs(Vec::new()));
-            expr.replace_attrs(attrs);
-
-            let allow_struct = AllowStruct(true);
-            return parse_expr(input, expr, allow_struct, Precedence::Any);
-        }
-
-        if input.peek(Token![.]) && !input.peek(Token![..]) || input.peek(Token![?]) {
-            expr = trailer_helper(input, expr)?;
-
-            attrs.extend(expr.replace_attrs(Vec::new()));
-            expr.replace_attrs(attrs);
-
-            let allow_struct = AllowStruct(true);
-            return parse_expr(input, expr, allow_struct, Precedence::Any);
-        }
-
-        attrs.extend(expr.replace_attrs(Vec::new()));
-        expr.replace_attrs(attrs);
-        Ok(expr)
-    }
-
-    #[cfg(feature = "full")]
-    fn continue_parsing_early(mut expr: &Expr) -> bool {
-        while let Expr::Group(group) = expr {
-            expr = &group.expr;
-        }
-        match expr {
-            Expr::If(_)
-            | Expr::While(_)
-            | Expr::ForLoop(_)
-            | Expr::Loop(_)
-            | Expr::Match(_)
-            | Expr::TryBlock(_)
-            | Expr::Unsafe(_)
-            | Expr::Const(_)
-            | Expr::Block(_) => false,
-            _ => true,
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprLit {
-        fn parse(input: ParseStream) -> Result<Self> {
-            Ok(ExprLit {
-                attrs: Vec::new(),
-                lit: input.parse()?,
-            })
-        }
-    }
-
-    fn expr_group(
-        input: ParseStream,
-        #[cfg(feature = "full")] allow_struct: AllowStruct,
-    ) -> Result<Expr> {
-        let group = crate::group::parse_group(input)?;
-        let mut inner: Expr = group.content.parse()?;
-
-        match inner {
-            Expr::Path(mut expr) if expr.attrs.is_empty() => {
-                let grouped_len = expr.path.segments.len();
-                Path::parse_rest(input, &mut expr.path, true)?;
-                match rest_of_path_or_macro_or_struct(
-                    expr.qself,
-                    expr.path,
-                    input,
-                    #[cfg(feature = "full")]
-                    allow_struct,
-                )? {
-                    Expr::Path(expr) if expr.path.segments.len() == grouped_len => {
-                        inner = Expr::Path(expr);
-                    }
-                    extended => return Ok(extended),
-                }
-            }
-            _ => {}
-        }
-
-        Ok(Expr::Group(ExprGroup {
-            attrs: Vec::new(),
-            group_token: group.token,
-            expr: Box::new(inner),
-        }))
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprParen {
-        fn parse(input: ParseStream) -> Result<Self> {
-            expr_paren(input)
-        }
-    }
-
-    fn expr_paren(input: ParseStream) -> Result<ExprParen> {
-        let content;
-        Ok(ExprParen {
-            attrs: Vec::new(),
-            paren_token: parenthesized!(content in input),
-            expr: content.parse()?,
-        })
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprLet {
-        fn parse(input: ParseStream) -> Result<Self> {
-            Ok(ExprLet {
-                attrs: Vec::new(),
-                let_token: input.parse()?,
-                pat: Box::new(Pat::parse_multi_with_leading_vert(input)?),
-                eq_token: input.parse()?,
-                expr: Box::new({
-                    let allow_struct = AllowStruct(false);
-                    let lhs = unary_expr(input, allow_struct)?;
-                    parse_expr(input, lhs, allow_struct, Precedence::Compare)?
-                }),
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprIf {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let attrs = input.call(Attribute::parse_outer)?;
-            Ok(ExprIf {
-                attrs,
-                if_token: input.parse()?,
-                cond: Box::new(input.call(Expr::parse_without_eager_brace)?),
-                then_branch: input.parse()?,
-                else_branch: {
-                    if input.peek(Token![else]) {
-                        Some(input.call(else_block)?)
-                    } else {
-                        None
-                    }
-                },
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    fn else_block(input: ParseStream) -> Result<(Token![else], Box<Expr>)> {
-        let else_token: Token![else] = input.parse()?;
-
-        let lookahead = input.lookahead1();
-        let else_branch = if lookahead.peek(Token![if]) {
-            input.parse().map(Expr::If)?
-        } else if lookahead.peek(token::Brace) {
-            Expr::Block(ExprBlock {
-                attrs: Vec::new(),
-                label: None,
-                block: input.parse()?,
-            })
-        } else {
-            return Err(lookahead.error());
-        };
-
-        Ok((else_token, Box::new(else_branch)))
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprInfer {
-        fn parse(input: ParseStream) -> Result<Self> {
-            Ok(ExprInfer {
-                attrs: input.call(Attribute::parse_outer)?,
-                underscore_token: input.parse()?,
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprForLoop {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let mut attrs = input.call(Attribute::parse_outer)?;
-            let label: Option<Label> = input.parse()?;
-            let for_token: Token![for] = input.parse()?;
-
-            let pat = Pat::parse_multi_with_leading_vert(input)?;
-
-            let in_token: Token![in] = input.parse()?;
-            let expr: Expr = input.call(Expr::parse_without_eager_brace)?;
-
-            let content;
-            let brace_token = braced!(content in input);
-            attr::parsing::parse_inner(&content, &mut attrs)?;
-            let stmts = content.call(Block::parse_within)?;
-
-            Ok(ExprForLoop {
-                attrs,
-                label,
-                for_token,
-                pat: Box::new(pat),
-                in_token,
-                expr: Box::new(expr),
-                body: Block { brace_token, stmts },
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprLoop {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let mut attrs = input.call(Attribute::parse_outer)?;
-            let label: Option<Label> = input.parse()?;
-            let loop_token: Token![loop] = input.parse()?;
-
-            let content;
-            let brace_token = braced!(content in input);
-            attr::parsing::parse_inner(&content, &mut attrs)?;
-            let stmts = content.call(Block::parse_within)?;
-
-            Ok(ExprLoop {
-                attrs,
-                label,
-                loop_token,
-                body: Block { brace_token, stmts },
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprMatch {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let mut attrs = input.call(Attribute::parse_outer)?;
-            let match_token: Token![match] = input.parse()?;
-            let expr = Expr::parse_without_eager_brace(input)?;
-
-            let content;
-            let brace_token = braced!(content in input);
-            attr::parsing::parse_inner(&content, &mut attrs)?;
-
-            let mut arms = Vec::new();
-            while !content.is_empty() {
-                arms.push(content.call(Arm::parse)?);
-            }
-
-            Ok(ExprMatch {
-                attrs,
-                match_token,
-                expr: Box::new(expr),
-                brace_token,
-                arms,
-            })
-        }
-    }
-
-    macro_rules! impl_by_parsing_expr {
-        (
-            $(
-                $expr_type:ty, $variant:ident, $msg:expr,
-            )*
-        ) => {
-            $(
-                #[cfg(all(feature = "full", feature = "printing"))]
-                #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-                impl Parse for $expr_type {
-                    fn parse(input: ParseStream) -> Result<Self> {
-                        let mut expr: Expr = input.parse()?;
-                        loop {
-                            match expr {
-                                Expr::$variant(inner) => return Ok(inner),
-                                Expr::Group(next) => expr = *next.expr,
-                                _ => return Err(Error::new_spanned(expr, $msg)),
-                            }
-                        }
-                    }
-                }
-            )*
-        };
-    }
-
-    impl_by_parsing_expr! {
-        ExprAssign, Assign, "expected assignment expression",
-        ExprAwait, Await, "expected await expression",
-        ExprBinary, Binary, "expected binary operation",
-        ExprCall, Call, "expected function call expression",
-        ExprCast, Cast, "expected cast expression",
-        ExprField, Field, "expected struct field access",
-        ExprIndex, Index, "expected indexing expression",
-        ExprMethodCall, MethodCall, "expected method call expression",
-        ExprRange, Range, "expected range expression",
-        ExprTry, Try, "expected try expression",
-        ExprTuple, Tuple, "expected tuple expression",
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprUnary {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let attrs = Vec::new();
-            let allow_struct = AllowStruct(true);
-            expr_unary(input, attrs, allow_struct)
-        }
-    }
-
-    #[cfg(feature = "full")]
-    fn expr_unary(
-        input: ParseStream,
-        attrs: Vec<Attribute>,
-        allow_struct: AllowStruct,
-    ) -> Result<ExprUnary> {
-        Ok(ExprUnary {
-            attrs,
-            op: input.parse()?,
-            expr: Box::new(unary_expr(input, allow_struct)?),
-        })
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprClosure {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let allow_struct = AllowStruct(true);
-            expr_closure(input, allow_struct)
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprReference {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let allow_struct = AllowStruct(true);
-            Ok(ExprReference {
-                attrs: Vec::new(),
-                and_token: input.parse()?,
-                mutability: input.parse()?,
-                expr: Box::new(unary_expr(input, allow_struct)?),
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprBreak {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let allow_struct = AllowStruct(true);
-            expr_break(input, allow_struct)
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprReturn {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let allow_struct = AllowStruct(true);
-            expr_return(input, allow_struct)
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprTryBlock {
-        fn parse(input: ParseStream) -> Result<Self> {
-            Ok(ExprTryBlock {
-                attrs: Vec::new(),
-                try_token: input.parse()?,
-                block: input.parse()?,
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprYield {
-        fn parse(input: ParseStream) -> Result<Self> {
-            Ok(ExprYield {
-                attrs: Vec::new(),
-                yield_token: input.parse()?,
-                expr: {
-                    if can_begin_expr(input) {
-                        Some(input.parse()?)
-                    } else {
-                        None
-                    }
-                },
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    fn expr_closure(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprClosure> {
-        let lifetimes: Option<BoundLifetimes> = input.parse()?;
-        let constness: Option<Token![const]> = input.parse()?;
-        let movability: Option<Token![static]> = input.parse()?;
-        let asyncness: Option<Token![async]> = input.parse()?;
-        let capture: Option<Token![move]> = input.parse()?;
-        let or1_token: Token![|] = input.parse()?;
-
-        let mut inputs = Punctuated::new();
-        loop {
-            if input.peek(Token![|]) {
-                break;
-            }
-            let value = closure_arg(input)?;
-            inputs.push_value(value);
-            if input.peek(Token![|]) {
-                break;
-            }
-            let punct: Token![,] = input.parse()?;
-            inputs.push_punct(punct);
-        }
-
-        let or2_token: Token![|] = input.parse()?;
-
-        let (output, body) = if input.peek(Token![->]) {
-            let arrow_token: Token![->] = input.parse()?;
-            let ty: Type = input.parse()?;
-            let body: Block = input.parse()?;
-            let output = ReturnType::Type(arrow_token, Box::new(ty));
-            let block = Expr::Block(ExprBlock {
-                attrs: Vec::new(),
-                label: None,
-                block: body,
-            });
-            (output, block)
-        } else {
-            let body = ambiguous_expr(input, allow_struct)?;
-            (ReturnType::Default, body)
-        };
-
-        Ok(ExprClosure {
-            attrs: Vec::new(),
-            lifetimes,
-            constness,
-            movability,
-            asyncness,
-            capture,
-            or1_token,
-            inputs,
-            or2_token,
-            output,
-            body: Box::new(body),
-        })
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprAsync {
-        fn parse(input: ParseStream) -> Result<Self> {
-            Ok(ExprAsync {
-                attrs: Vec::new(),
-                async_token: input.parse()?,
-                capture: input.parse()?,
-                block: input.parse()?,
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    fn closure_arg(input: ParseStream) -> Result<Pat> {
-        let attrs = input.call(Attribute::parse_outer)?;
-        let mut pat = Pat::parse_single(input)?;
-
-        if input.peek(Token![:]) {
-            Ok(Pat::Type(PatType {
-                attrs,
-                pat: Box::new(pat),
-                colon_token: input.parse()?,
-                ty: input.parse()?,
-            }))
-        } else {
-            match &mut pat {
-                Pat::Const(pat) => pat.attrs = attrs,
-                Pat::Ident(pat) => pat.attrs = attrs,
-                Pat::Lit(pat) => pat.attrs = attrs,
-                Pat::Macro(pat) => pat.attrs = attrs,
-                Pat::Or(pat) => pat.attrs = attrs,
-                Pat::Paren(pat) => pat.attrs = attrs,
-                Pat::Path(pat) => pat.attrs = attrs,
-                Pat::Range(pat) => pat.attrs = attrs,
-                Pat::Reference(pat) => pat.attrs = attrs,
-                Pat::Rest(pat) => pat.attrs = attrs,
-                Pat::Slice(pat) => pat.attrs = attrs,
-                Pat::Struct(pat) => pat.attrs = attrs,
-                Pat::Tuple(pat) => pat.attrs = attrs,
-                Pat::TupleStruct(pat) => pat.attrs = attrs,
-                Pat::Type(_) => unreachable!(),
-                Pat::Verbatim(_) => {}
-                Pat::Wild(pat) => pat.attrs = attrs,
-            }
-            Ok(pat)
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprWhile {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let mut attrs = input.call(Attribute::parse_outer)?;
-            let label: Option<Label> = input.parse()?;
-            let while_token: Token![while] = input.parse()?;
-            let cond = Expr::parse_without_eager_brace(input)?;
-
-            let content;
-            let brace_token = braced!(content in input);
-            attr::parsing::parse_inner(&content, &mut attrs)?;
-            let stmts = content.call(Block::parse_within)?;
-
-            Ok(ExprWhile {
-                attrs,
-                label,
-                while_token,
-                cond: Box::new(cond),
-                body: Block { brace_token, stmts },
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprConst {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let const_token: Token![const] = input.parse()?;
-
-            let content;
-            let brace_token = braced!(content in input);
-            let inner_attrs = content.call(Attribute::parse_inner)?;
-            let stmts = content.call(Block::parse_within)?;
-
-            Ok(ExprConst {
-                attrs: inner_attrs,
-                const_token,
-                block: Block { brace_token, stmts },
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for Label {
-        fn parse(input: ParseStream) -> Result<Self> {
-            Ok(Label {
-                name: input.parse()?,
-                colon_token: input.parse()?,
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for Option<Label> {
-        fn parse(input: ParseStream) -> Result<Self> {
-            if input.peek(Lifetime) {
-                input.parse().map(Some)
-            } else {
-                Ok(None)
-            }
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprContinue {
-        fn parse(input: ParseStream) -> Result<Self> {
-            Ok(ExprContinue {
-                attrs: Vec::new(),
-                continue_token: input.parse()?,
-                label: input.parse()?,
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    fn expr_break(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprBreak> {
-        let break_token: Token![break] = input.parse()?;
-
-        let ahead = input.fork();
-        let label: Option<Lifetime> = ahead.parse()?;
-        if label.is_some() && ahead.peek(Token![:]) {
-            // Not allowed: `break 'label: loop {...}`
-            // Parentheses are required. `break ('label: loop {...})`
-            let _ = ambiguous_expr(input, allow_struct)?;
-            let start_span = label.unwrap().apostrophe;
-            let end_span = input.cursor().prev_span();
-            return Err(crate::error::new2(
-                start_span,
-                end_span,
-                "parentheses required",
-            ));
-        }
-
-        input.advance_to(&ahead);
-        let expr = if can_begin_expr(input) && (allow_struct.0 || !input.peek(token::Brace)) {
-            let expr = ambiguous_expr(input, allow_struct)?;
-            Some(Box::new(expr))
-        } else {
-            None
-        };
-
-        Ok(ExprBreak {
-            attrs: Vec::new(),
-            break_token,
-            label,
-            expr,
-        })
-    }
-
-    #[cfg(feature = "full")]
-    fn expr_return(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprReturn> {
-        Ok(ExprReturn {
-            attrs: Vec::new(),
-            return_token: input.parse()?,
-            expr: {
-                if can_begin_expr(input) {
-                    // NOTE: return is greedy and eats blocks after it even when in a
-                    // position where structs are not allowed, such as in if statement
-                    // conditions. For example:
-                    //
-                    // if return { println!("A") } {} // Prints "A"
-                    let expr = ambiguous_expr(input, allow_struct)?;
-                    Some(Box::new(expr))
-                } else {
-                    None
-                }
-            },
-        })
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for FieldValue {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let attrs = input.call(Attribute::parse_outer)?;
-            let member: Member = input.parse()?;
-            let (colon_token, value) = if input.peek(Token![:]) || !member.is_named() {
-                let colon_token: Token![:] = input.parse()?;
-                let value: Expr = input.parse()?;
-                (Some(colon_token), value)
-            } else if let Member::Named(ident) = &member {
-                let value = Expr::Path(ExprPath {
-                    attrs: Vec::new(),
-                    qself: None,
-                    path: Path::from(ident.clone()),
-                });
-                (None, value)
-            } else {
-                unreachable!()
-            };
-
-            Ok(FieldValue {
-                attrs,
-                member,
-                colon_token,
-                expr: value,
-            })
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprStruct {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let (qself, path) = path::parsing::qpath(input, true)?;
-            expr_struct_helper(input, qself, path)
-        }
-    }
-
-    fn expr_struct_helper(
-        input: ParseStream,
-        qself: Option<QSelf>,
-        path: Path,
-    ) -> Result<ExprStruct> {
-        let content;
-        let brace_token = braced!(content in input);
-
-        let mut fields = Punctuated::new();
-        while !content.is_empty() {
-            if content.peek(Token![..]) {
-                return Ok(ExprStruct {
-                    attrs: Vec::new(),
-                    qself,
-                    path,
-                    brace_token,
-                    fields,
-                    dot2_token: Some(content.parse()?),
-                    rest: if content.is_empty() {
-                        None
-                    } else {
-                        Some(Box::new(content.parse()?))
-                    },
-                });
-            }
-
-            fields.push(content.parse()?);
-            if content.is_empty() {
-                break;
-            }
-            let punct: Token![,] = content.parse()?;
-            fields.push_punct(punct);
-        }
-
-        Ok(ExprStruct {
-            attrs: Vec::new(),
-            qself,
-            path,
-            brace_token,
-            fields,
-            dot2_token: None,
-            rest: None,
-        })
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprUnsafe {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let unsafe_token: Token![unsafe] = input.parse()?;
-
-            let content;
-            let brace_token = braced!(content in input);
-            let inner_attrs = content.call(Attribute::parse_inner)?;
-            let stmts = content.call(Block::parse_within)?;
-
-            Ok(ExprUnsafe {
-                attrs: inner_attrs,
-                unsafe_token,
-                block: Block { brace_token, stmts },
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprBlock {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let mut attrs = input.call(Attribute::parse_outer)?;
-            let label: Option<Label> = input.parse()?;
-
-            let content;
-            let brace_token = braced!(content in input);
-            attr::parsing::parse_inner(&content, &mut attrs)?;
-            let stmts = content.call(Block::parse_within)?;
-
-            Ok(ExprBlock {
-                attrs,
-                label,
-                block: Block { brace_token, stmts },
-            })
-        }
-    }
-
-    #[cfg(feature = "full")]
-    fn expr_range(input: ParseStream, allow_struct: AllowStruct) -> Result<ExprRange> {
-        let limits: RangeLimits = input.parse()?;
-        let end = if matches!(limits, RangeLimits::HalfOpen(_))
-            && (input.is_empty()
-                || input.peek(Token![,])
-                || input.peek(Token![;])
-                || input.peek(Token![.]) && !input.peek(Token![..])
-                || !allow_struct.0 && input.peek(token::Brace))
-        {
-            None
-        } else {
-            let to = ambiguous_expr(input, allow_struct)?;
-            Some(Box::new(to))
-        };
-        Ok(ExprRange {
-            attrs: Vec::new(),
-            start: None,
-            limits,
-            end,
-        })
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for RangeLimits {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let lookahead = input.lookahead1();
-            let dot_dot = lookahead.peek(Token![..]);
-            let dot_dot_eq = dot_dot && lookahead.peek(Token![..=]);
-            let dot_dot_dot = dot_dot && input.peek(Token![...]);
-            if dot_dot_eq {
-                input.parse().map(RangeLimits::Closed)
-            } else if dot_dot && !dot_dot_dot {
-                input.parse().map(RangeLimits::HalfOpen)
-            } else {
-                Err(lookahead.error())
-            }
-        }
-    }
-
-    #[cfg(feature = "full")]
-    impl RangeLimits {
-        pub(crate) fn parse_obsolete(input: ParseStream) -> Result<Self> {
-            let lookahead = input.lookahead1();
-            let dot_dot = lookahead.peek(Token![..]);
-            let dot_dot_eq = dot_dot && lookahead.peek(Token![..=]);
-            let dot_dot_dot = dot_dot && input.peek(Token![...]);
-            if dot_dot_eq {
-                input.parse().map(RangeLimits::Closed)
-            } else if dot_dot_dot {
-                let dot3: Token![...] = input.parse()?;
-                Ok(RangeLimits::Closed(Token![..=](dot3.spans)))
-            } else if dot_dot {
-                input.parse().map(RangeLimits::HalfOpen)
-            } else {
-                Err(lookahead.error())
-            }
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for ExprPath {
-        fn parse(input: ParseStream) -> Result<Self> {
-            #[cfg(not(feature = "full"))]
-            let attrs = Vec::new();
-            #[cfg(feature = "full")]
-            let attrs = input.call(Attribute::parse_outer)?;
-
-            let (qself, path) = path::parsing::qpath(input, true)?;
-
-            Ok(ExprPath { attrs, qself, path })
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for Member {
-        fn parse(input: ParseStream) -> Result<Self> {
-            if input.peek(Ident) {
-                input.parse().map(Member::Named)
-            } else if input.peek(LitInt) {
-                input.parse().map(Member::Unnamed)
-            } else {
-                Err(input.error("expected identifier or integer"))
-            }
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for Arm {
-        fn parse(input: ParseStream) -> Result<Arm> {
-            let requires_comma;
-            Ok(Arm {
-                attrs: input.call(Attribute::parse_outer)?,
-                pat: Pat::parse_multi_with_leading_vert(input)?,
-                guard: {
-                    if input.peek(Token![if]) {
-                        let if_token: Token![if] = input.parse()?;
-                        let guard: Expr = input.parse()?;
-                        Some((if_token, Box::new(guard)))
-                    } else {
-                        None
-                    }
-                },
-                fat_arrow_token: input.parse()?,
-                body: {
-                    let body = input.call(expr_early)?;
-                    requires_comma = requires_terminator(&body);
-                    Box::new(body)
-                },
-                comma: {
-                    if requires_comma && !input.is_empty() {
-                        Some(input.parse()?)
-                    } else {
-                        input.parse()?
-                    }
-                },
-            })
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
-    impl Parse for Index {
-        fn parse(input: ParseStream) -> Result<Self> {
-            let lit: LitInt = input.parse()?;
-            if lit.suffix().is_empty() {
-                Ok(Index {
-                    index: lit
-                        .base10_digits()
-                        .parse()
-                        .map_err(|err| Error::new(lit.span(), err))?,
-                    span: lit.span(),
-                })
-            } else {
-                Err(Error::new(lit.span(), "expected unsuffixed integer"))
-            }
-        }
-    }
-
-    fn multi_index(e: &mut Expr, dot_token: &mut Token![.], float: LitFloat) -> Result<bool> {
-        let float_token = float.token();
-        let float_span = float_token.span();
-        let mut float_repr = float_token.to_string();
-        let trailing_dot = float_repr.ends_with('.');
-        if trailing_dot {
-            float_repr.truncate(float_repr.len() - 1);
-        }
-
-        let mut offset = 0;
-        for part in float_repr.split('.') {
-            let mut index: Index =
-                crate::parse_str(part).map_err(|err| Error::new(float_span, err))?;
-            let part_end = offset + part.len();
-            index.span = float_token.subspan(offset..part_end).unwrap_or(float_span);
-
-            let base = mem::replace(e, Expr::DUMMY);
-            *e = Expr::Field(ExprField {
-                attrs: Vec::new(),
-                base: Box::new(base),
-                dot_token: Token![.](dot_token.span),
-                member: Member::Unnamed(index),
-            });
-
-            let dot_span = float_token
-                .subspan(part_end..part_end + 1)
-                .unwrap_or(float_span);
-            *dot_token = Token![.](dot_span);
-            offset = part_end + 1;
-        }
-
-        Ok(!trailing_dot)
-    }
-
-    impl Member {
-        pub(crate) fn is_named(&self) -> bool {
-            match self {
-                Member::Named(_) => true,
-                Member::Unnamed(_) => false,
-            }
-        }
-    }
-
-    fn check_cast(input: ParseStream) -> Result<()> {
-        let kind = if input.peek(Token![.]) && !input.peek(Token![..]) {
-            if input.peek2(Token![await]) {
-                "`.await`"
-            } else if input.peek2(Ident) && (input.peek3(token::Paren) || input.peek3(Token![::])) {
-                "a method call"
-            } else {
-                "a field access"
-            }
-        } else if input.peek(Token![?]) {
-            "`?`"
-        } else if input.peek(token::Bracket) {
-            "indexing"
-        } else if input.peek(token::Paren) {
-            "a function call"
-        } else {
-            return Ok(());
-        };
-        let msg = format!("casts cannot be followed by {}", kind);
-        Err(input.error(msg))
-    }
-}
-
-#[cfg(feature = "printing")]
-pub(crate) mod printing {
-    use super::*;
-    #[cfg(feature = "full")]
-    use crate::attr::FilterAttrs;
-    use proc_macro2::{Literal, TokenStream};
-    use quote::{ToTokens, TokenStreamExt};
-
-    // If the given expression is a bare `ExprStruct`, wraps it in parenthesis
-    // before appending it to `TokenStream`.
-    #[cfg(feature = "full")]
-    fn wrap_bare_struct(tokens: &mut TokenStream, e: &Expr) {
-        if let Expr::Struct(_) = *e {
-            token::Paren::default().surround(tokens, |tokens| {
-                e.to_tokens(tokens);
-            });
-        } else {
-            e.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    pub(crate) fn outer_attrs_to_tokens(attrs: &[Attribute], tokens: &mut TokenStream) {
-        tokens.append_all(attrs.outer());
-    }
-
-    #[cfg(feature = "full")]
-    fn inner_attrs_to_tokens(attrs: &[Attribute], tokens: &mut TokenStream) {
-        tokens.append_all(attrs.inner());
-    }
-
-    #[cfg(not(feature = "full"))]
-    pub(crate) fn outer_attrs_to_tokens(_attrs: &[Attribute], _tokens: &mut TokenStream) {}
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprArray {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.bracket_token.surround(tokens, |tokens| {
-                self.elems.to_tokens(tokens);
-            });
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprAssign {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.left.to_tokens(tokens);
-            self.eq_token.to_tokens(tokens);
-            self.right.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprAsync {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.async_token.to_tokens(tokens);
-            self.capture.to_tokens(tokens);
-            self.block.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprAwait {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.base.to_tokens(tokens);
-            self.dot_token.to_tokens(tokens);
-            self.await_token.to_tokens(tokens);
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprBinary {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.left.to_tokens(tokens);
-            self.op.to_tokens(tokens);
-            self.right.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprBlock {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.label.to_tokens(tokens);
-            self.block.brace_token.surround(tokens, |tokens| {
-                inner_attrs_to_tokens(&self.attrs, tokens);
-                tokens.append_all(&self.block.stmts);
-            });
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprBreak {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.break_token.to_tokens(tokens);
-            self.label.to_tokens(tokens);
-            self.expr.to_tokens(tokens);
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprCall {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.func.to_tokens(tokens);
-            self.paren_token.surround(tokens, |tokens| {
-                self.args.to_tokens(tokens);
-            });
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprCast {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.expr.to_tokens(tokens);
-            self.as_token.to_tokens(tokens);
-            self.ty.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprClosure {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.lifetimes.to_tokens(tokens);
-            self.constness.to_tokens(tokens);
-            self.movability.to_tokens(tokens);
-            self.asyncness.to_tokens(tokens);
-            self.capture.to_tokens(tokens);
-            self.or1_token.to_tokens(tokens);
-            self.inputs.to_tokens(tokens);
-            self.or2_token.to_tokens(tokens);
-            self.output.to_tokens(tokens);
-            self.body.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprConst {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.const_token.to_tokens(tokens);
-            self.block.brace_token.surround(tokens, |tokens| {
-                inner_attrs_to_tokens(&self.attrs, tokens);
-                tokens.append_all(&self.block.stmts);
-            });
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprContinue {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.continue_token.to_tokens(tokens);
-            self.label.to_tokens(tokens);
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprField {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.base.to_tokens(tokens);
-            self.dot_token.to_tokens(tokens);
-            self.member.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprForLoop {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.label.to_tokens(tokens);
-            self.for_token.to_tokens(tokens);
-            self.pat.to_tokens(tokens);
-            self.in_token.to_tokens(tokens);
-            wrap_bare_struct(tokens, &self.expr);
-            self.body.brace_token.surround(tokens, |tokens| {
-                inner_attrs_to_tokens(&self.attrs, tokens);
-                tokens.append_all(&self.body.stmts);
-            });
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprGroup {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.group_token.surround(tokens, |tokens| {
-                self.expr.to_tokens(tokens);
-            });
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprIf {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.if_token.to_tokens(tokens);
-            wrap_bare_struct(tokens, &self.cond);
-            self.then_branch.to_tokens(tokens);
-            if let Some((else_token, else_)) = &self.else_branch {
-                else_token.to_tokens(tokens);
-                // If we are not one of the valid expressions to exist in an else
-                // clause, wrap ourselves in a block.
-                match **else_ {
-                    Expr::If(_) | Expr::Block(_) => else_.to_tokens(tokens),
-                    _ => token::Brace::default().surround(tokens, |tokens| else_.to_tokens(tokens)),
-                }
-            }
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprIndex {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.expr.to_tokens(tokens);
-            self.bracket_token.surround(tokens, |tokens| {
-                self.index.to_tokens(tokens);
-            });
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprInfer {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.underscore_token.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprLet {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.let_token.to_tokens(tokens);
-            self.pat.to_tokens(tokens);
-            self.eq_token.to_tokens(tokens);
-            wrap_bare_struct(tokens, &self.expr);
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprLit {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.lit.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprLoop {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.label.to_tokens(tokens);
-            self.loop_token.to_tokens(tokens);
-            self.body.brace_token.surround(tokens, |tokens| {
-                inner_attrs_to_tokens(&self.attrs, tokens);
-                tokens.append_all(&self.body.stmts);
-            });
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprMacro {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.mac.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprMatch {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.match_token.to_tokens(tokens);
-            wrap_bare_struct(tokens, &self.expr);
-            self.brace_token.surround(tokens, |tokens| {
-                inner_attrs_to_tokens(&self.attrs, tokens);
-                for (i, arm) in self.arms.iter().enumerate() {
-                    arm.to_tokens(tokens);
-                    // Ensure that we have a comma after a non-block arm, except
-                    // for the last one.
-                    let is_last = i == self.arms.len() - 1;
-                    if !is_last && requires_terminator(&arm.body) && arm.comma.is_none() {
-                        <Token![,]>::default().to_tokens(tokens);
-                    }
-                }
-            });
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprMethodCall {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.receiver.to_tokens(tokens);
-            self.dot_token.to_tokens(tokens);
-            self.method.to_tokens(tokens);
-            self.turbofish.to_tokens(tokens);
-            self.paren_token.surround(tokens, |tokens| {
-                self.args.to_tokens(tokens);
-            });
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprParen {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.paren_token.surround(tokens, |tokens| {
-                self.expr.to_tokens(tokens);
-            });
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprPath {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            path::printing::print_path(tokens, &self.qself, &self.path);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprRange {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.start.to_tokens(tokens);
-            self.limits.to_tokens(tokens);
-            self.end.to_tokens(tokens);
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprReference {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.and_token.to_tokens(tokens);
-            self.mutability.to_tokens(tokens);
-            self.expr.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprRepeat {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.bracket_token.surround(tokens, |tokens| {
-                self.expr.to_tokens(tokens);
-                self.semi_token.to_tokens(tokens);
-                self.len.to_tokens(tokens);
-            });
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprReturn {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.return_token.to_tokens(tokens);
-            self.expr.to_tokens(tokens);
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprStruct {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            path::printing::print_path(tokens, &self.qself, &self.path);
-            self.brace_token.surround(tokens, |tokens| {
-                self.fields.to_tokens(tokens);
-                if let Some(dot2_token) = &self.dot2_token {
-                    dot2_token.to_tokens(tokens);
-                } else if self.rest.is_some() {
-                    Token![..](Span::call_site()).to_tokens(tokens);
-                }
-                self.rest.to_tokens(tokens);
-            });
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprTry {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.expr.to_tokens(tokens);
-            self.question_token.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprTryBlock {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.try_token.to_tokens(tokens);
-            self.block.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprTuple {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.paren_token.surround(tokens, |tokens| {
-                self.elems.to_tokens(tokens);
-                // If we only have one argument, we need a trailing comma to
-                // distinguish ExprTuple from ExprParen.
-                if self.elems.len() == 1 && !self.elems.trailing_punct() {
-                    <Token![,]>::default().to_tokens(tokens);
-                }
-            });
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprUnary {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.op.to_tokens(tokens);
-            self.expr.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprUnsafe {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.unsafe_token.to_tokens(tokens);
-            self.block.brace_token.surround(tokens, |tokens| {
-                inner_attrs_to_tokens(&self.attrs, tokens);
-                tokens.append_all(&self.block.stmts);
-            });
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprWhile {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.label.to_tokens(tokens);
-            self.while_token.to_tokens(tokens);
-            wrap_bare_struct(tokens, &self.cond);
-            self.body.brace_token.surround(tokens, |tokens| {
-                inner_attrs_to_tokens(&self.attrs, tokens);
-                tokens.append_all(&self.body.stmts);
-            });
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for ExprYield {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.yield_token.to_tokens(tokens);
-            self.expr.to_tokens(tokens);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for Arm {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            tokens.append_all(&self.attrs);
-            self.pat.to_tokens(tokens);
-            if let Some((if_token, guard)) = &self.guard {
-                if_token.to_tokens(tokens);
-                guard.to_tokens(tokens);
-            }
-            self.fat_arrow_token.to_tokens(tokens);
-            self.body.to_tokens(tokens);
-            self.comma.to_tokens(tokens);
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for FieldValue {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            outer_attrs_to_tokens(&self.attrs, tokens);
-            self.member.to_tokens(tokens);
-            if let Some(colon_token) = &self.colon_token {
-                colon_token.to_tokens(tokens);
-                self.expr.to_tokens(tokens);
-            }
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for Index {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            let mut lit = Literal::i64_unsuffixed(i64::from(self.index));
-            lit.set_span(self.span);
-            tokens.append(lit);
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for Label {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            self.name.to_tokens(tokens);
-            self.colon_token.to_tokens(tokens);
-        }
-    }
-
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for Member {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            match self {
-                Member::Named(ident) => ident.to_tokens(tokens),
-                Member::Unnamed(index) => index.to_tokens(tokens),
-            }
-        }
-    }
-
-    #[cfg(feature = "full")]
-    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
-    impl ToTokens for RangeLimits {
-        fn to_tokens(&self, tokens: &mut TokenStream) {
-            match self {
-                RangeLimits::HalfOpen(t) => t.to_tokens(tokens),
-                RangeLimits::Closed(t) => t.to_tokens(tokens),
-            }
-        }
-    }
-}
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