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 </pre><pre class="rust"><code><span class="doccomment">//! [![github]](https://github.com/dtolnay/syn)&amp;ensp;[![crates-io]](https://crates.io/crates/syn)&amp;ensp;[![docs-rs]](crate)</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&amp;labelColor=555555&amp;logo=github</span>
 <span class="doccomment">//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&amp;labelColor=555555&amp;logo=rust</span>
 <span class="doccomment">//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&amp;labelColor=555555&amp;logoColor=white&amp;logo=data:image/svg+xml;base64,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</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! &lt;br&gt;</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! Syn is a parsing library for parsing a stream of Rust tokens into a syntax</span>
 <span class="doccomment">//! tree of Rust source code.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! Currently this library is geared toward use in Rust procedural macros, but</span>
 <span class="doccomment">//! contains some APIs that may be useful more generally.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! - **Data structures** — Syn provides a complete syntax tree that can</span>
 <span class="doccomment">//!   represent any valid Rust source code. The syntax tree is rooted at</span>
 <span class="doccomment">//!   [`syn::File`] which represents a full source file, but there are other</span>
 <span class="doccomment">//!   entry points that may be useful to procedural macros including</span>
 <span class="doccomment">//!   [`syn::Item`], [`syn::Expr`] and [`syn::Type`].</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! - **Derives** — Of particular interest to derive macros is</span>
 <span class="doccomment">//!   [`syn::DeriveInput`] which is any of the three legal input items to a</span>
 <span class="doccomment">//!   derive macro. An example below shows using this type in a library that can</span>
 <span class="doccomment">//!   derive implementations of a user-defined trait.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! - **Parsing** — Parsing in Syn is built around [parser functions] with the</span>
 <span class="doccomment">//!   signature `fn(ParseStream) -&gt; Result&lt;T&gt;`. Every syntax tree node defined</span>
 <span class="doccomment">//!   by Syn is individually parsable and may be used as a building block for</span>
 <span class="doccomment">//!   custom syntaxes, or you may dream up your own brand new syntax without</span>
 <span class="doccomment">//!   involving any of our syntax tree types.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! - **Location information** — Every token parsed by Syn is associated with a</span>
 <span class="doccomment">//!   `Span` that tracks line and column information back to the source of that</span>
 <span class="doccomment">//!   token. These spans allow a procedural macro to display detailed error</span>
 <span class="doccomment">//!   messages pointing to all the right places in the user&#39;s code. There is an</span>
 <span class="doccomment">//!   example of this below.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! - **Feature flags** — Functionality is aggressively feature gated so your</span>
 <span class="doccomment">//!   procedural macros enable only what they need, and do not pay in compile</span>
 <span class="doccomment">//!   time for all the rest.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [`syn::File`]: File</span>
 <span class="doccomment">//! [`syn::Item`]: Item</span>
 <span class="doccomment">//! [`syn::Expr`]: Expr</span>
 <span class="doccomment">//! [`syn::Type`]: Type</span>
 <span class="doccomment">//! [`syn::DeriveInput`]: DeriveInput</span>
 <span class="doccomment">//! [parser functions]: mod@parse</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! &lt;br&gt;</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # Example of a derive macro</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! The canonical derive macro using Syn looks like this. We write an ordinary</span>
 <span class="doccomment">//! Rust function tagged with a `proc_macro_derive` attribute and the name of</span>
 <span class="doccomment">//! the trait we are deriving. Any time that derive appears in the user&#39;s code,</span>
 <span class="doccomment">//! the Rust compiler passes their data structure as tokens into our macro. We</span>
 <span class="doccomment">//! get to execute arbitrary Rust code to figure out what to do with those</span>
 <span class="doccomment">//! tokens, then hand some tokens back to the compiler to compile into the</span>
 <span class="doccomment">//! user&#39;s crate.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [`TokenStream`]: proc_macro::TokenStream</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! ```toml</span>
 <span class="doccomment">//! [dependencies]</span>
 <span class="doccomment">//! syn = &quot;1.0&quot;</span>
 <span class="doccomment">//! quote = &quot;1.0&quot;</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [lib]</span>
 <span class="doccomment">//! proc-macro = true</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//! # extern crate proc_macro;</span>
 <span class="doccomment">//! #</span>
 <span class="doccomment">//! use proc_macro::TokenStream;</span>
 <span class="doccomment">//! use quote::quote;</span>
 <span class="doccomment">//! use syn::{parse_macro_input, DeriveInput};</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # const IGNORE_TOKENS: &amp;str = stringify! {</span>
 <span class="doccomment">//! #[proc_macro_derive(MyMacro)]</span>
 <span class="doccomment">//! # };</span>
 <span class="doccomment">//! pub fn my_macro(input: TokenStream) -&gt; TokenStream {</span>
 <span class="doccomment">//!     // Parse the input tokens into a syntax tree</span>
 <span class="doccomment">//!     let input = parse_macro_input!(input as DeriveInput);</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//!     // Build the output, possibly using quasi-quotation</span>
 <span class="doccomment">//!     let expanded = quote! {</span>
 <span class="doccomment">//!         // ...</span>
 <span class="doccomment">//!     };</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//!     // Hand the output tokens back to the compiler</span>
 <span class="doccomment">//!     TokenStream::from(expanded)</span>
 <span class="doccomment">//! }</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! The [`heapsize`] example directory shows a complete working implementation</span>
 <span class="doccomment">//! of a derive macro. It works on any Rust compiler 1.31+. The example derives</span>
 <span class="doccomment">//! a `HeapSize` trait which computes an estimate of the amount of heap memory</span>
 <span class="doccomment">//! owned by a value.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [`heapsize`]: https://github.com/dtolnay/syn/tree/master/examples/heapsize</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//! pub trait HeapSize {</span>
 <span class="doccomment">//!     /// Total number of bytes of heap memory owned by `self`.</span>
 <span class="doccomment">//!     fn heap_size_of_children(&amp;self) -&gt; usize;</span>
 <span class="doccomment">//! }</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! The derive macro allows users to write `#[derive(HeapSize)]` on data</span>
 <span class="doccomment">//! structures in their program.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//! # const IGNORE_TOKENS: &amp;str = stringify! {</span>
 <span class="doccomment">//! #[derive(HeapSize)]</span>
 <span class="doccomment">//! # };</span>
 <span class="doccomment">//! struct Demo&lt;&#39;a, T: ?Sized&gt; {</span>
 <span class="doccomment">//!     a: Box&lt;T&gt;,</span>
 <span class="doccomment">//!     b: u8,</span>
 <span class="doccomment">//!     c: &amp;&#39;a str,</span>
 <span class="doccomment">//!     d: String,</span>
 <span class="doccomment">//! }</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! &lt;p&gt;&lt;br&gt;&lt;/p&gt;</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # Spans and error reporting</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! The token-based procedural macro API provides great control over where the</span>
 <span class="doccomment">//! compiler&#39;s error messages are displayed in user code. Consider the error the</span>
 <span class="doccomment">//! user sees if one of their field types does not implement `HeapSize`.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//! # const IGNORE_TOKENS: &amp;str = stringify! {</span>
 <span class="doccomment">//! #[derive(HeapSize)]</span>
 <span class="doccomment">//! # };</span>
 <span class="doccomment">//! struct Broken {</span>
 <span class="doccomment">//!     ok: String,</span>
 <span class="doccomment">//!     bad: std::thread::Thread,</span>
 <span class="doccomment">//! }</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! By tracking span information all the way through the expansion of a</span>
 <span class="doccomment">//! procedural macro as shown in the `heapsize` example, token-based macros in</span>
 <span class="doccomment">//! Syn are able to trigger errors that directly pinpoint the source of the</span>
 <span class="doccomment">//! problem.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! ```text</span>
 <span class="doccomment">//! error[E0277]: the trait bound `std::thread::Thread: HeapSize` is not satisfied</span>
 <span class="doccomment">//!  --&gt; src/main.rs:7:5</span>
 <span class="doccomment">//!   |</span>
 <span class="doccomment">//! 7 |     bad: std::thread::Thread,</span>
 <span class="doccomment">//!   |     ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `HeapSize` is not implemented for `Thread`</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! &lt;br&gt;</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # Parsing a custom syntax</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! The [`lazy-static`] example directory shows the implementation of a</span>
 <span class="doccomment">//! `functionlike!(...)` procedural macro in which the input tokens are parsed</span>
 <span class="doccomment">//! using Syn&#39;s parsing API.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [`lazy-static`]: https://github.com/dtolnay/syn/tree/master/examples/lazy-static</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! The example reimplements the popular `lazy_static` crate from crates.io as a</span>
 <span class="doccomment">//! procedural macro.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//! # macro_rules! lazy_static {</span>
 <span class="doccomment">//! #     ($($tt:tt)*) =&gt; {}</span>
 <span class="doccomment">//! # }</span>
 <span class="doccomment">//! #</span>
 <span class="doccomment">//! lazy_static! {</span>
 <span class="doccomment">//!     static ref USERNAME: Regex = Regex::new(&quot;^[a-z0-9_-]{3,16}$&quot;).unwrap();</span>
 <span class="doccomment">//! }</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! The implementation shows how to trigger custom warnings and error messages</span>
 <span class="doccomment">//! on the macro input.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! ```text</span>
 <span class="doccomment">//! warning: come on, pick a more creative name</span>
 <span class="doccomment">//!   --&gt; src/main.rs:10:16</span>
 <span class="doccomment">//!    |</span>
 <span class="doccomment">//! 10 |     static ref FOO: String = &quot;lazy_static&quot;.to_owned();</span>
 <span class="doccomment">//!    |                ^^^</span>
 <span class="doccomment">//! ```</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! &lt;br&gt;</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # Testing</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! When testing macros, we often care not just that the macro can be used</span>
 <span class="doccomment">//! successfully but also that when the macro is provided with invalid input it</span>
 <span class="doccomment">//! produces maximally helpful error messages. Consider using the [`trybuild`]</span>
 <span class="doccomment">//! crate to write tests for errors that are emitted by your macro or errors</span>
 <span class="doccomment">//! detected by the Rust compiler in the expanded code following misuse of the</span>
 <span class="doccomment">//! macro. Such tests help avoid regressions from later refactors that</span>
 <span class="doccomment">//! mistakenly make an error no longer trigger or be less helpful than it used</span>
 <span class="doccomment">//! to be.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [`trybuild`]: https://github.com/dtolnay/trybuild</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! &lt;br&gt;</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # Debugging</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! When developing a procedural macro it can be helpful to look at what the</span>
 <span class="doccomment">//! generated code looks like. Use `cargo rustc -- -Zunstable-options</span>
 <span class="doccomment">//! --pretty=expanded` or the [`cargo expand`] subcommand.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [`cargo expand`]: https://github.com/dtolnay/cargo-expand</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! To show the expanded code for some crate that uses your procedural macro,</span>
 <span class="doccomment">//! run `cargo expand` from that crate. To show the expanded code for one of</span>
 <span class="doccomment">//! your own test cases, run `cargo expand --test the_test_case` where the last</span>
 <span class="doccomment">//! argument is the name of the test file without the `.rs` extension.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! This write-up by Brandon W Maister discusses debugging in more detail:</span>
 <span class="doccomment">//! [Debugging Rust&#39;s new Custom Derive system][debugging].</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! [debugging]: https://quodlibetor.github.io/posts/debugging-rusts-new-custom-derive-system/</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! &lt;br&gt;</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! # Optional features</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! Syn puts a lot of functionality behind optional features in order to</span>
 <span class="doccomment">//! optimize compile time for the most common use cases. The following features</span>
 <span class="doccomment">//! are available.</span>
 <span class="doccomment">//!</span>
 <span class="doccomment">//! - **`derive`** *(enabled by default)* — Data structures for representing the</span>
 <span class="doccomment">//!   possible input to a derive macro, including structs and enums and types.</span>
 <span class="doccomment">//! - **`full`** — Data structures for representing the syntax tree of all valid</span>
 <span class="doccomment">//!   Rust source code, including items and expressions.</span>
 <span class="doccomment">//! - **`parsing`** *(enabled by default)* — Ability to parse input tokens into</span>
 <span class="doccomment">//!   a syntax tree node of a chosen type.</span>
 <span class="doccomment">//! - **`printing`** *(enabled by default)* — Ability to print a syntax tree</span>
 <span class="doccomment">//!   node as tokens of Rust source code.</span>
 <span class="doccomment">//! - **`visit`** — Trait for traversing a syntax tree.</span>
 <span class="doccomment">//! - **`visit-mut`** — Trait for traversing and mutating in place a syntax</span>
 <span class="doccomment">//!   tree.</span>
 <span class="doccomment">//! - **`fold`** — Trait for transforming an owned syntax tree.</span>
 <span class="doccomment">//! - **`clone-impls`** *(enabled by default)* — Clone impls for all syntax tree</span>
 <span class="doccomment">//!   types.</span>
 <span class="doccomment">//! - **`extra-traits`** — Debug, Eq, PartialEq, Hash impls for all syntax tree</span>
 <span class="doccomment">//!   types.</span>
 <span class="doccomment">//! - **`proc-macro`** *(enabled by default)* — Runtime dependency on the</span>
 <span class="doccomment">//!   dynamic library libproc_macro from rustc toolchain.</span>

 <span class="comment">// Syn types in rustdoc of other crates get linked to here.</span>
 <span class="attribute">#![<span class="ident">doc</span>(<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">&quot;https://docs.rs/syn/1.0.85&quot;</span>)]</span>
 <span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">feature</span>(<span class="ident">doc_cfg</span>))]</span>
 <span class="attribute">#![<span class="ident">allow</span>(<span class="ident">non_camel_case_types</span>)]</span>
 <span class="comment">// Ignored clippy lints.</span>
 <span class="attribute">#![<span class="ident">allow</span>(
     <span class="ident">clippy::cast_lossless</span>,
     <span class="ident">clippy::collapsible_match</span>, <span class="comment">// https://github.com/rust-lang/rust-clippy/issues/7575</span>
     <span class="ident">clippy::doc_markdown</span>,
     <span class="ident">clippy::eval_order_dependence</span>,
     <span class="ident">clippy::inherent_to_string</span>,
     <span class="ident">clippy::large_enum_variant</span>,
     <span class="ident">clippy::let_underscore_drop</span>,
     <span class="ident">clippy::manual_assert</span>,
     <span class="ident">clippy::manual_map</span>, <span class="comment">// https://github.com/rust-lang/rust-clippy/issues/6795</span>
     <span class="ident">clippy::match_on_vec_items</span>,
     <span class="ident">clippy::missing_panics_doc</span>,
     <span class="ident">clippy::needless_doctest_main</span>,
     <span class="ident">clippy::needless_pass_by_value</span>,
     <span class="ident">clippy::never_loop</span>,
     <span class="ident">clippy::return_self_not_must_use</span>,
     <span class="ident">clippy::too_many_arguments</span>,
     <span class="ident">clippy::trivially_copy_pass_by_ref</span>,
     <span class="ident">clippy::unnecessary_unwrap</span>,
     <span class="comment">// clippy bug: https://github.com/rust-lang/rust-clippy/issues/6983</span>
     <span class="ident">clippy::wrong_self_convention</span>
 )]</span>
 <span class="comment">// Ignored clippy_pedantic lints.</span>
 <span class="attribute">#![<span class="ident">allow</span>(
     <span class="ident">clippy::cast_possible_truncation</span>,
     <span class="comment">// clippy bug: https://github.com/rust-lang/rust-clippy/issues/7127</span>
     <span class="ident">clippy::cloned_instead_of_copied</span>,
     <span class="ident">clippy::default_trait_access</span>,
     <span class="ident">clippy::empty_enum</span>,
     <span class="ident">clippy::expl_impl_clone_on_copy</span>,
     <span class="ident">clippy::if_not_else</span>,
     <span class="ident">clippy::match_same_arms</span>,
     <span class="comment">// clippy bug: https://github.com/rust-lang/rust-clippy/issues/6984</span>
     <span class="ident">clippy::match_wildcard_for_single_variants</span>,
     <span class="ident">clippy::missing_errors_doc</span>,
     <span class="ident">clippy::module_name_repetitions</span>,
     <span class="ident">clippy::must_use_candidate</span>,
     <span class="ident">clippy::option_if_let_else</span>,
     <span class="ident">clippy::redundant_else</span>,
     <span class="ident">clippy::shadow_unrelated</span>,
     <span class="ident">clippy::similar_names</span>,
     <span class="ident">clippy::single_match_else</span>,
     <span class="ident">clippy::too_many_lines</span>,
     <span class="ident">clippy::unseparated_literal_suffix</span>,
     <span class="ident">clippy::used_underscore_binding</span>,
     <span class="ident">clippy::wildcard_imports</span>
 )]</span>

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(
     <span class="ident">not</span>(<span class="ident">all</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>, <span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;unknown&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;wasi&quot;</span>))),
     <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;proc-macro&quot;</span>
 ))]</span>
 <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">proc_macro</span>;
 <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">proc_macro2</span>;
 <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">unicode_xid</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;printing&quot;</span>)]</span>
 <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">quote</span>;

 <span class="attribute">#[<span class="ident">macro_use</span>]</span>
 <span class="kw">mod</span> <span class="ident">macros</span>;

 <span class="comment">// Not public API.</span>
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
 <span class="attribute">#[<span class="ident">macro_use</span>]</span>
 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">group</span>;

 <span class="attribute">#[<span class="ident">macro_use</span>]</span>
 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">token</span>;

 <span class="kw">mod</span> <span class="ident">ident</span>;
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::ident::Ident</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">attr</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::attr</span>::{
     <span class="ident">AttrStyle</span>, <span class="ident">Attribute</span>, <span class="ident">AttributeArgs</span>, <span class="ident">Meta</span>, <span class="ident">MetaList</span>, <span class="ident">MetaNameValue</span>, <span class="ident">NestedMeta</span>,
 };

 <span class="kw">mod</span> <span class="ident">bigint</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">data</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::data</span>::{
     <span class="ident">Field</span>, <span class="ident">Fields</span>, <span class="ident">FieldsNamed</span>, <span class="ident">FieldsUnnamed</span>, <span class="ident">Variant</span>, <span class="ident">VisCrate</span>, <span class="ident">VisPublic</span>, <span class="ident">VisRestricted</span>,
     <span class="ident">Visibility</span>,
 };

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">expr</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>)]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::expr</span>::{
     <span class="ident">Arm</span>, <span class="ident">FieldValue</span>, <span class="ident">GenericMethodArgument</span>, <span class="ident">Label</span>, <span class="ident">MethodTurbofish</span>, <span class="ident">RangeLimits</span>,
 };
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::expr</span>::{
     <span class="ident">Expr</span>, <span class="ident">ExprArray</span>, <span class="ident">ExprAssign</span>, <span class="ident">ExprAssignOp</span>, <span class="ident">ExprAsync</span>, <span class="ident">ExprAwait</span>, <span class="ident">ExprBinary</span>, <span class="ident">ExprBlock</span>,
     <span class="ident">ExprBox</span>, <span class="ident">ExprBreak</span>, <span class="ident">ExprCall</span>, <span class="ident">ExprCast</span>, <span class="ident">ExprClosure</span>, <span class="ident">ExprContinue</span>, <span class="ident">ExprField</span>, <span class="ident">ExprForLoop</span>,
     <span class="ident">ExprGroup</span>, <span class="ident">ExprIf</span>, <span class="ident">ExprIndex</span>, <span class="ident">ExprLet</span>, <span class="ident">ExprLit</span>, <span class="ident">ExprLoop</span>, <span class="ident">ExprMacro</span>, <span class="ident">ExprMatch</span>, <span class="ident">ExprMethodCall</span>,
     <span class="ident">ExprParen</span>, <span class="ident">ExprPath</span>, <span class="ident">ExprRange</span>, <span class="ident">ExprReference</span>, <span class="ident">ExprRepeat</span>, <span class="ident">ExprReturn</span>, <span class="ident">ExprStruct</span>, <span class="ident">ExprTry</span>,
     <span class="ident">ExprTryBlock</span>, <span class="ident">ExprTuple</span>, <span class="ident">ExprType</span>, <span class="ident">ExprUnary</span>, <span class="ident">ExprUnsafe</span>, <span class="ident">ExprWhile</span>, <span class="ident">ExprYield</span>, <span class="ident">Index</span>, <span class="ident">Member</span>,
 };

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">generics</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::generics</span>::{
     <span class="ident">BoundLifetimes</span>, <span class="ident">ConstParam</span>, <span class="ident">GenericParam</span>, <span class="ident">Generics</span>, <span class="ident">LifetimeDef</span>, <span class="ident">PredicateEq</span>,
     <span class="ident">PredicateLifetime</span>, <span class="ident">PredicateType</span>, <span class="ident">TraitBound</span>, <span class="ident">TraitBoundModifier</span>, <span class="ident">TypeParam</span>, <span class="ident">TypeParamBound</span>,
     <span class="ident">WhereClause</span>, <span class="ident">WherePredicate</span>,
 };
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;printing&quot;</span>))]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::generics</span>::{<span class="ident">ImplGenerics</span>, <span class="ident">Turbofish</span>, <span class="ident">TypeGenerics</span>};

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>)]</span>
 <span class="kw">mod</span> <span class="ident">item</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>)]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::item</span>::{
     <span class="ident">FnArg</span>, <span class="ident">ForeignItem</span>, <span class="ident">ForeignItemFn</span>, <span class="ident">ForeignItemMacro</span>, <span class="ident">ForeignItemStatic</span>, <span class="ident">ForeignItemType</span>,
     <span class="ident">ImplItem</span>, <span class="ident">ImplItemConst</span>, <span class="ident">ImplItemMacro</span>, <span class="ident">ImplItemMethod</span>, <span class="ident">ImplItemType</span>, <span class="ident">Item</span>, <span class="ident">ItemConst</span>,
     <span class="ident">ItemEnum</span>, <span class="ident">ItemExternCrate</span>, <span class="ident">ItemFn</span>, <span class="ident">ItemForeignMod</span>, <span class="ident">ItemImpl</span>, <span class="ident">ItemMacro</span>, <span class="ident">ItemMacro2</span>, <span class="ident">ItemMod</span>,
     <span class="ident">ItemStatic</span>, <span class="ident">ItemStruct</span>, <span class="ident">ItemTrait</span>, <span class="ident">ItemTraitAlias</span>, <span class="ident">ItemType</span>, <span class="ident">ItemUnion</span>, <span class="ident">ItemUse</span>, <span class="ident">Receiver</span>,
     <span class="ident">Signature</span>, <span class="ident">TraitItem</span>, <span class="ident">TraitItemConst</span>, <span class="ident">TraitItemMacro</span>, <span class="ident">TraitItemMethod</span>, <span class="ident">TraitItemType</span>, <span class="ident">UseGlob</span>,
     <span class="ident">UseGroup</span>, <span class="ident">UseName</span>, <span class="ident">UsePath</span>, <span class="ident">UseRename</span>, <span class="ident">UseTree</span>,
 };

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>)]</span>
 <span class="kw">mod</span> <span class="ident">file</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>)]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::file::File</span>;

 <span class="kw">mod</span> <span class="ident">lifetime</span>;
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::lifetime::Lifetime</span>;

 <span class="kw">mod</span> <span class="ident">lit</span>;
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::lit</span>::{
     <span class="ident">Lit</span>, <span class="ident">LitBool</span>, <span class="ident">LitByte</span>, <span class="ident">LitByteStr</span>, <span class="ident">LitChar</span>, <span class="ident">LitFloat</span>, <span class="ident">LitInt</span>, <span class="ident">LitStr</span>, <span class="ident">StrStyle</span>,
 };

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">mac</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::mac</span>::{<span class="ident">Macro</span>, <span class="ident">MacroDelimiter</span>};

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">derive</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>)]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::derive</span>::{<span class="ident">Data</span>, <span class="ident">DataEnum</span>, <span class="ident">DataStruct</span>, <span class="ident">DataUnion</span>, <span class="ident">DeriveInput</span>};

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">op</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::op</span>::{<span class="ident">BinOp</span>, <span class="ident">UnOp</span>};

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>)]</span>
 <span class="kw">mod</span> <span class="ident">stmt</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>)]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::stmt</span>::{<span class="ident">Block</span>, <span class="ident">Local</span>, <span class="ident">Stmt</span>};

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">ty</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::ty</span>::{
     <span class="ident">Abi</span>, <span class="ident">BareFnArg</span>, <span class="ident">ReturnType</span>, <span class="ident">Type</span>, <span class="ident">TypeArray</span>, <span class="ident">TypeBareFn</span>, <span class="ident">TypeGroup</span>, <span class="ident">TypeImplTrait</span>, <span class="ident">TypeInfer</span>,
     <span class="ident">TypeMacro</span>, <span class="ident">TypeNever</span>, <span class="ident">TypeParen</span>, <span class="ident">TypePath</span>, <span class="ident">TypePtr</span>, <span class="ident">TypeReference</span>, <span class="ident">TypeSlice</span>, <span class="ident">TypeTraitObject</span>,
     <span class="ident">TypeTuple</span>, <span class="ident">Variadic</span>,
 };

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>)]</span>
 <span class="kw">mod</span> <span class="ident">pat</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>)]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::pat</span>::{
     <span class="ident">FieldPat</span>, <span class="ident">Pat</span>, <span class="ident">PatBox</span>, <span class="ident">PatIdent</span>, <span class="ident">PatLit</span>, <span class="ident">PatMacro</span>, <span class="ident">PatOr</span>, <span class="ident">PatPath</span>, <span class="ident">PatRange</span>, <span class="ident">PatReference</span>,
     <span class="ident">PatRest</span>, <span class="ident">PatSlice</span>, <span class="ident">PatStruct</span>, <span class="ident">PatTuple</span>, <span class="ident">PatTupleStruct</span>, <span class="ident">PatType</span>, <span class="ident">PatWild</span>,
 };

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">path</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::path</span>::{
     <span class="ident">AngleBracketedGenericArguments</span>, <span class="ident">Binding</span>, <span class="ident">Constraint</span>, <span class="ident">GenericArgument</span>,
     <span class="ident">ParenthesizedGenericArguments</span>, <span class="ident">Path</span>, <span class="ident">PathArguments</span>, <span class="ident">PathSegment</span>, <span class="ident">QSelf</span>,
 };

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">buffer</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">ext</span>;
 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">punctuated</span>;
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">tt</span>;

 <span class="comment">// Not public API except the `parse_quote!` macro.</span>
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">parse_quote</span>;

 <span class="comment">// Not public API except the `parse_macro_input!` macro.</span>
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(
     <span class="ident">not</span>(<span class="ident">all</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>, <span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;unknown&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;wasi&quot;</span>))),
     <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>,
     <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;proc-macro&quot;</span>
 ))]</span>
 <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">parse_macro_input</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;printing&quot;</span>))]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;printing&quot;</span>))))]</span>
 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">spanned</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">whitespace</span>;

 <span class="kw">mod</span> <span class="ident">gen</span> {
     <span class="doccomment">/// Syntax tree traversal to walk a shared borrow of a syntax tree.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Each method of the [`Visit`] trait is a hook that can be overridden to</span>
     <span class="doccomment">/// customize the behavior when visiting the corresponding type of node. By</span>
     <span class="doccomment">/// default, every method recursively visits the substructure of the input</span>
     <span class="doccomment">/// by invoking the right visitor method of each of its fields.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`Visit`]: visit::Visit</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">/// # use syn::{Attribute, BinOp, Expr, ExprBinary};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// pub trait Visit&lt;&#39;ast&gt; {</span>
     <span class="doccomment">///     /* ... */</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///     fn visit_expr_binary(&amp;mut self, node: &amp;&#39;ast ExprBinary) {</span>
     <span class="doccomment">///         visit_expr_binary(self, node);</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///     /* ... */</span>
     <span class="doccomment">///     # fn visit_attribute(&amp;mut self, node: &amp;&#39;ast Attribute);</span>
     <span class="doccomment">///     # fn visit_expr(&amp;mut self, node: &amp;&#39;ast Expr);</span>
     <span class="doccomment">///     # fn visit_bin_op(&amp;mut self, node: &amp;&#39;ast BinOp);</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// pub fn visit_expr_binary&lt;&#39;ast, V&gt;(v: &amp;mut V, node: &amp;&#39;ast ExprBinary)</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     V: Visit&lt;&#39;ast&gt; + ?Sized,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     for attr in &amp;node.attrs {</span>
     <span class="doccomment">///         v.visit_attribute(attr);</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">///     v.visit_expr(&amp;*node.left);</span>
     <span class="doccomment">///     v.visit_bin_op(&amp;node.op);</span>
     <span class="doccomment">///     v.visit_expr(&amp;*node.right);</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// /* ... */</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// *This module is available only if Syn is built with the `&quot;visit&quot;` feature.*</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// &lt;br&gt;</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// # Example</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This visitor will print the name of every freestanding function in the</span>
     <span class="doccomment">/// syntax tree, including nested functions.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">/// // [dependencies]</span>
     <span class="doccomment">/// // quote = &quot;1.0&quot;</span>
     <span class="doccomment">/// // syn = { version = &quot;1.0&quot;, features = [&quot;full&quot;, &quot;visit&quot;] }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// use quote::quote;</span>
     <span class="doccomment">/// use syn::visit::{self, Visit};</span>
     <span class="doccomment">/// use syn::{File, ItemFn};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct FnVisitor;</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl&lt;&#39;ast&gt; Visit&lt;&#39;ast&gt; for FnVisitor {</span>
     <span class="doccomment">///     fn visit_item_fn(&amp;mut self, node: &amp;&#39;ast ItemFn) {</span>
     <span class="doccomment">///         println!(&quot;Function with name={}&quot;, node.sig.ident);</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///         // Delegate to the default impl to visit any nested functions.</span>
     <span class="doccomment">///         visit::visit_item_fn(self, node);</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// fn main() {</span>
     <span class="doccomment">///     let code = quote! {</span>
     <span class="doccomment">///         pub fn f() {</span>
     <span class="doccomment">///             fn g() {}</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///     };</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///     let syntax_tree: File = syn::parse2(code).unwrap();</span>
     <span class="doccomment">///     FnVisitor.visit_file(&amp;syntax_tree);</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// The `&#39;ast` lifetime on the input references means that the syntax tree</span>
     <span class="doccomment">/// outlives the complete recursive visit call, so the visitor is allowed to</span>
     <span class="doccomment">/// hold on to references into the syntax tree.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">/// use quote::quote;</span>
     <span class="doccomment">/// use syn::visit::{self, Visit};</span>
     <span class="doccomment">/// use syn::{File, ItemFn};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct FnVisitor&lt;&#39;ast&gt; {</span>
     <span class="doccomment">///     functions: Vec&lt;&amp;&#39;ast ItemFn&gt;,</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl&lt;&#39;ast&gt; Visit&lt;&#39;ast&gt; for FnVisitor&lt;&#39;ast&gt; {</span>
     <span class="doccomment">///     fn visit_item_fn(&amp;mut self, node: &amp;&#39;ast ItemFn) {</span>
     <span class="doccomment">///         self.functions.push(node);</span>
     <span class="doccomment">///         visit::visit_item_fn(self, node);</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// fn main() {</span>
     <span class="doccomment">///     let code = quote! {</span>
     <span class="doccomment">///         pub fn f() {</span>
     <span class="doccomment">///             fn g() {}</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///     };</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///     let syntax_tree: File = syn::parse2(code).unwrap();</span>
     <span class="doccomment">///     let mut visitor = FnVisitor { functions: Vec::new() };</span>
     <span class="doccomment">///     visitor.visit_file(&amp;syntax_tree);</span>
     <span class="doccomment">///     for f in visitor.functions {</span>
     <span class="doccomment">///         println!(&quot;Function with name={}&quot;, f.sig.ident);</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;visit&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;visit&quot;</span>)))]</span>
     <span class="attribute">#[<span class="ident">rustfmt::skip</span>]</span>
     <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">visit</span>;

     <span class="doccomment">/// Syntax tree traversal to mutate an exclusive borrow of a syntax tree in</span>
     <span class="doccomment">/// place.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Each method of the [`VisitMut`] trait is a hook that can be overridden</span>
     <span class="doccomment">/// to customize the behavior when mutating the corresponding type of node.</span>
     <span class="doccomment">/// By default, every method recursively visits the substructure of the</span>
     <span class="doccomment">/// input by invoking the right visitor method of each of its fields.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`VisitMut`]: visit_mut::VisitMut</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">/// # use syn::{Attribute, BinOp, Expr, ExprBinary};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// pub trait VisitMut {</span>
     <span class="doccomment">///     /* ... */</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///     fn visit_expr_binary_mut(&amp;mut self, node: &amp;mut ExprBinary) {</span>
     <span class="doccomment">///         visit_expr_binary_mut(self, node);</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///     /* ... */</span>
     <span class="doccomment">///     # fn visit_attribute_mut(&amp;mut self, node: &amp;mut Attribute);</span>
     <span class="doccomment">///     # fn visit_expr_mut(&amp;mut self, node: &amp;mut Expr);</span>
     <span class="doccomment">///     # fn visit_bin_op_mut(&amp;mut self, node: &amp;mut BinOp);</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// pub fn visit_expr_binary_mut&lt;V&gt;(v: &amp;mut V, node: &amp;mut ExprBinary)</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     V: VisitMut + ?Sized,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     for attr in &amp;mut node.attrs {</span>
     <span class="doccomment">///         v.visit_attribute_mut(attr);</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">///     v.visit_expr_mut(&amp;mut *node.left);</span>
     <span class="doccomment">///     v.visit_bin_op_mut(&amp;mut node.op);</span>
     <span class="doccomment">///     v.visit_expr_mut(&amp;mut *node.right);</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// /* ... */</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// *This module is available only if Syn is built with the `&quot;visit-mut&quot;`</span>
     <span class="doccomment">/// feature.*</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// &lt;br&gt;</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// # Example</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This mut visitor replace occurrences of u256 suffixed integer literals</span>
     <span class="doccomment">/// like `999u256` with a macro invocation `bigint::u256!(999)`.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">/// // [dependencies]</span>
     <span class="doccomment">/// // quote = &quot;1.0&quot;</span>
     <span class="doccomment">/// // syn = { version = &quot;1.0&quot;, features = [&quot;full&quot;, &quot;visit-mut&quot;] }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// use quote::quote;</span>
     <span class="doccomment">/// use syn::visit_mut::{self, VisitMut};</span>
     <span class="doccomment">/// use syn::{parse_quote, Expr, File, Lit, LitInt};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct BigintReplace;</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl VisitMut for BigintReplace {</span>
     <span class="doccomment">///     fn visit_expr_mut(&amp;mut self, node: &amp;mut Expr) {</span>
     <span class="doccomment">///         if let Expr::Lit(expr) = &amp;node {</span>
     <span class="doccomment">///             if let Lit::Int(int) = &amp;expr.lit {</span>
     <span class="doccomment">///                 if int.suffix() == &quot;u256&quot; {</span>
     <span class="doccomment">///                     let digits = int.base10_digits();</span>
     <span class="doccomment">///                     let unsuffixed: LitInt = syn::parse_str(digits).unwrap();</span>
     <span class="doccomment">///                     *node = parse_quote!(bigint::u256!(#unsuffixed));</span>
     <span class="doccomment">///                     return;</span>
     <span class="doccomment">///                 }</span>
     <span class="doccomment">///             }</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///         // Delegate to the default impl to visit nested expressions.</span>
     <span class="doccomment">///         visit_mut::visit_expr_mut(self, node);</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// fn main() {</span>
     <span class="doccomment">///     let code = quote! {</span>
     <span class="doccomment">///         fn main() {</span>
     <span class="doccomment">///             let _ = 999u256;</span>
     <span class="doccomment">///         }</span>
     <span class="doccomment">///     };</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///     let mut syntax_tree: File = syn::parse2(code).unwrap();</span>
     <span class="doccomment">///     BigintReplace.visit_file_mut(&amp;mut syntax_tree);</span>
     <span class="doccomment">///     println!(&quot;{}&quot;, quote!(#syntax_tree));</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;visit-mut&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;visit-mut&quot;</span>)))]</span>
     <span class="attribute">#[<span class="ident">rustfmt::skip</span>]</span>
     <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">visit_mut</span>;

     <span class="doccomment">/// Syntax tree traversal to transform the nodes of an owned syntax tree.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// Each method of the [`Fold`] trait is a hook that can be overridden to</span>
     <span class="doccomment">/// customize the behavior when transforming the corresponding type of node.</span>
     <span class="doccomment">/// By default, every method recursively visits the substructure of the</span>
     <span class="doccomment">/// input by invoking the right visitor method of each of its fields.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// [`Fold`]: fold::Fold</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">/// # use syn::{Attribute, BinOp, Expr, ExprBinary};</span>
     <span class="doccomment">/// #</span>
     <span class="doccomment">/// pub trait Fold {</span>
     <span class="doccomment">///     /* ... */</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///     fn fold_expr_binary(&amp;mut self, node: ExprBinary) -&gt; ExprBinary {</span>
     <span class="doccomment">///         fold_expr_binary(self, node)</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///     /* ... */</span>
     <span class="doccomment">///     # fn fold_attribute(&amp;mut self, node: Attribute) -&gt; Attribute;</span>
     <span class="doccomment">///     # fn fold_expr(&amp;mut self, node: Expr) -&gt; Expr;</span>
     <span class="doccomment">///     # fn fold_bin_op(&amp;mut self, node: BinOp) -&gt; BinOp;</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// pub fn fold_expr_binary&lt;V&gt;(v: &amp;mut V, node: ExprBinary) -&gt; ExprBinary</span>
     <span class="doccomment">/// where</span>
     <span class="doccomment">///     V: Fold + ?Sized,</span>
     <span class="doccomment">/// {</span>
     <span class="doccomment">///     ExprBinary {</span>
     <span class="doccomment">///         attrs: node</span>
     <span class="doccomment">///             .attrs</span>
     <span class="doccomment">///             .into_iter()</span>
     <span class="doccomment">///             .map(|attr| v.fold_attribute(attr))</span>
     <span class="doccomment">///             .collect(),</span>
     <span class="doccomment">///         left: Box::new(v.fold_expr(*node.left)),</span>
     <span class="doccomment">///         op: v.fold_bin_op(node.op),</span>
     <span class="doccomment">///         right: Box::new(v.fold_expr(*node.right)),</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// /* ... */</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// *This module is available only if Syn is built with the `&quot;fold&quot;` feature.*</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// &lt;br&gt;</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// # Example</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// This fold inserts parentheses to fully parenthesizes any expression.</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// ```</span>
     <span class="doccomment">/// // [dependencies]</span>
     <span class="doccomment">/// // quote = &quot;1.0&quot;</span>
     <span class="doccomment">/// // syn = { version = &quot;1.0&quot;, features = [&quot;fold&quot;, &quot;full&quot;] }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// use quote::quote;</span>
     <span class="doccomment">/// use syn::fold::{fold_expr, Fold};</span>
     <span class="doccomment">/// use syn::{token, Expr, ExprParen};</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// struct ParenthesizeEveryExpr;</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// impl Fold for ParenthesizeEveryExpr {</span>
     <span class="doccomment">///     fn fold_expr(&amp;mut self, expr: Expr) -&gt; Expr {</span>
     <span class="doccomment">///         Expr::Paren(ExprParen {</span>
     <span class="doccomment">///             attrs: Vec::new(),</span>
     <span class="doccomment">///             expr: Box::new(fold_expr(self, expr)),</span>
     <span class="doccomment">///             paren_token: token::Paren::default(),</span>
     <span class="doccomment">///         })</span>
     <span class="doccomment">///     }</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">///</span>
     <span class="doccomment">/// fn main() {</span>
     <span class="doccomment">///     let code = quote! { a() + b(1) * c.d };</span>
     <span class="doccomment">///     let expr: Expr = syn::parse2(code).unwrap();</span>
     <span class="doccomment">///     let parenthesized = ParenthesizeEveryExpr.fold_expr(expr);</span>
     <span class="doccomment">///     println!(&quot;{}&quot;, quote!(#parenthesized));</span>
     <span class="doccomment">///</span>
     <span class="doccomment">///     // Output: (((a)()) + (((b)((1))) * ((c).d)))</span>
     <span class="doccomment">/// }</span>
     <span class="doccomment">/// ```</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;fold&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;fold&quot;</span>)))]</span>
     <span class="attribute">#[<span class="ident">rustfmt::skip</span>]</span>
     <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">fold</span>;

     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;clone-impls&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">rustfmt::skip</span>]</span>
     <span class="kw">mod</span> <span class="ident">clone</span>;

     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">rustfmt::skip</span>]</span>
     <span class="kw">mod</span> <span class="ident">eq</span>;

     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">rustfmt::skip</span>]</span>
     <span class="kw">mod</span> <span class="ident">hash</span>;

     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;extra-traits&quot;</span>)]</span>
     <span class="attribute">#[<span class="ident">rustfmt::skip</span>]</span>
     <span class="kw">mod</span> <span class="ident">debug</span>;

     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
     <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;../gen_helper.rs&quot;</span>]</span>
     <span class="kw">mod</span> <span class="ident">helper</span>;
 }
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::gen</span>::<span class="kw-2">*</span>;

 <span class="comment">// Not public API.</span>
 <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
 <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;export.rs&quot;</span>]</span>
 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">__private</span>;

 <span class="kw">mod</span> <span class="ident">custom_keyword</span>;
 <span class="kw">mod</span> <span class="ident">custom_punctuation</span>;
 <span class="kw">mod</span> <span class="ident">sealed</span>;
 <span class="kw">mod</span> <span class="ident">span</span>;
 <span class="kw">mod</span> <span class="ident">thread</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="kw">mod</span> <span class="ident">lookahead</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
 <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">parse</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>)]</span>
 <span class="kw">mod</span> <span class="ident">reserved</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">verbatim</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;printing&quot;</span>))]</span>
 <span class="kw">mod</span> <span class="ident">print</span>;

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;derive&quot;</span>))]</span>
 <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::__private::private</span>;

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="comment">// https://github.com/rust-lang/rust/issues/62830</span>
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="kw">mod</span> <span class="ident">rustdoc_workaround</span> {
     <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::parse</span>::{<span class="self">self</span> <span class="kw">as</span> <span class="ident">parse_module</span>};
 }

 <span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

 <span class="kw">mod</span> <span class="ident">error</span>;
 <span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::error</span>::{<span class="ident">Error</span>, <span class="prelude-ty">Result</span>};

 <span class="doccomment">/// Parse tokens of source code into the chosen syntax tree node.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// This is preferred over parsing a string because tokens are able to preserve</span>
 <span class="doccomment">/// information about where in the user&#39;s code they were originally written (the</span>
 <span class="doccomment">/// &quot;span&quot; of the token), possibly allowing the compiler to produce better error</span>
 <span class="doccomment">/// messages.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// This function parses a `proc_macro::TokenStream` which is the type used for</span>
 <span class="doccomment">/// interop with the compiler in a procedural macro. To parse a</span>
 <span class="doccomment">/// `proc_macro2::TokenStream`, use [`syn::parse2`] instead.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [`syn::parse2`]: parse2</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// *This function is available only if Syn is built with both the `&quot;parsing&quot;` and</span>
 <span class="doccomment">/// `&quot;proc-macro&quot;` features.*</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Examples</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```</span>
 <span class="doccomment">/// # extern crate proc_macro;</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// use proc_macro::TokenStream;</span>
 <span class="doccomment">/// use quote::quote;</span>
 <span class="doccomment">/// use syn::DeriveInput;</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # const IGNORE_TOKENS: &amp;str = stringify! {</span>
 <span class="doccomment">/// #[proc_macro_derive(MyMacro)]</span>
 <span class="doccomment">/// # };</span>
 <span class="doccomment">/// pub fn my_macro(input: TokenStream) -&gt; TokenStream {</span>
 <span class="doccomment">///     // Parse the tokens into a syntax tree</span>
 <span class="doccomment">///     let ast: DeriveInput = syn::parse(input).unwrap();</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///     // Build the output, possibly using quasi-quotation</span>
 <span class="doccomment">///     let expanded = quote! {</span>
 <span class="doccomment">///         /* ... */</span>
 <span class="doccomment">///     };</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///     // Convert into a token stream and return it</span>
 <span class="doccomment">///     expanded.into()</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// ```</span>
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(
     <span class="ident">not</span>(<span class="ident">all</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>, <span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;unknown&quot;</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;wasi&quot;</span>))),
     <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>,
     <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;proc-macro&quot;</span>
 ))]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;proc-macro&quot;</span>))))]</span>
 <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">parse::Parse</span><span class="op">&gt;</span>(<span class="ident">tokens</span>: <span class="ident">proc_macro::TokenStream</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
     <span class="ident">parse::Parser::parse</span>(<span class="ident">T::parse</span>, <span class="ident">tokens</span>)
 }

 <span class="doccomment">/// Parse a proc-macro2 token stream into the chosen syntax tree node.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// This function will check that the input is fully parsed. If there are</span>
 <span class="doccomment">/// any unparsed tokens at the end of the stream, an error is returned.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// This function parses a `proc_macro2::TokenStream` which is commonly useful</span>
 <span class="doccomment">/// when the input comes from a node of the Syn syntax tree, for example the</span>
 <span class="doccomment">/// body tokens of a [`Macro`] node. When in a procedural macro parsing the</span>
 <span class="doccomment">/// `proc_macro::TokenStream` provided by the compiler, use [`syn::parse`]</span>
 <span class="doccomment">/// instead.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// [`syn::parse`]: parse()</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// *This function is available only if Syn is built with the `&quot;parsing&quot;` feature.*</span>
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
 <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse2</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">parse::Parse</span><span class="op">&gt;</span>(<span class="ident">tokens</span>: <span class="ident">proc_macro2::TokenStream</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
     <span class="ident">parse::Parser::parse2</span>(<span class="ident">T::parse</span>, <span class="ident">tokens</span>)
 }

 <span class="doccomment">/// Parse a string of Rust code into the chosen syntax tree node.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// *This function is available only if Syn is built with the `&quot;parsing&quot;` feature.*</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Hygiene</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// Every span in the resulting syntax tree will be set to resolve at the macro</span>
 <span class="doccomment">/// call site.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Examples</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```</span>
 <span class="doccomment">/// use syn::{Expr, Result};</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// fn run() -&gt; Result&lt;()&gt; {</span>
 <span class="doccomment">///     let code = &quot;assert_eq!(u8::max_value(), 255)&quot;;</span>
 <span class="doccomment">///     let expr = syn::parse_str::&lt;Expr&gt;(code)?;</span>
 <span class="doccomment">///     println!(&quot;{:#?}&quot;, expr);</span>
 <span class="doccomment">///     Ok(())</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # run().unwrap();</span>
 <span class="doccomment">/// ```</span>
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>)))]</span>
 <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_str</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">parse::Parse</span><span class="op">&gt;</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
     <span class="ident">parse::Parser::parse_str</span>(<span class="ident">T::parse</span>, <span class="ident">s</span>)
 }

 <span class="comment">// FIXME the name parse_file makes it sound like you might pass in a path to a</span>
 <span class="comment">// file, rather than the content.</span>
 <span class="doccomment">/// Parse the content of a file of Rust code.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// This is different from `syn::parse_str::&lt;File&gt;(content)` in two ways:</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// - It discards a leading byte order mark `\u{FEFF}` if the file has one.</span>
 <span class="doccomment">/// - It preserves the shebang line of the file, such as `#!/usr/bin/env rustx`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// If present, either of these would be an error using `from_str`.</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// *This function is available only if Syn is built with the `&quot;parsing&quot;` and</span>
 <span class="doccomment">/// `&quot;full&quot;` features.*</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// # Examples</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// ```no_run</span>
 <span class="doccomment">/// use std::error::Error;</span>
 <span class="doccomment">/// use std::fs::File;</span>
 <span class="doccomment">/// use std::io::Read;</span>
 <span class="doccomment">///</span>
 <span class="doccomment">/// fn run() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {</span>
 <span class="doccomment">///     let mut file = File::open(&quot;path/to/code.rs&quot;)?;</span>
 <span class="doccomment">///     let mut content = String::new();</span>
 <span class="doccomment">///     file.read_to_string(&amp;mut content)?;</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///     let ast = syn::parse_file(&amp;content)?;</span>
 <span class="doccomment">///     if let Some(shebang) = ast.shebang {</span>
 <span class="doccomment">///         println!(&quot;{}&quot;, shebang);</span>
 <span class="doccomment">///     }</span>
 <span class="doccomment">///     println!(&quot;{} items&quot;, ast.items.len());</span>
 <span class="doccomment">///</span>
 <span class="doccomment">///     Ok(())</span>
 <span class="doccomment">/// }</span>
 <span class="doccomment">/// #</span>
 <span class="doccomment">/// # run().unwrap();</span>
 <span class="doccomment">/// ```</span>
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>))]</span>
 <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;parsing&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;full&quot;</span>))))]</span>
 <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_file</span>(<span class="kw-2">mut</span> <span class="ident">content</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">File</span><span class="op">&gt;</span> {
     <span class="comment">// Strip the BOM if it is present</span>
     <span class="kw">const</span> <span class="ident">BOM</span>: <span class="kw-2">&amp;</span><span class="ident">str</span> <span class="op">=</span> <span class="string">&quot;\u{feff}&quot;</span>;
     <span class="kw">if</span> <span class="ident">content</span>.<span class="ident">starts_with</span>(<span class="ident">BOM</span>) {
         <span class="ident">content</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">content</span>[<span class="ident">BOM</span>.<span class="ident">len</span>()..];
     }

     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">shebang</span> <span class="op">=</span> <span class="prelude-val">None</span>;
     <span class="kw">if</span> <span class="ident">content</span>.<span class="ident">starts_with</span>(<span class="string">&quot;#!&quot;</span>) {
         <span class="kw">let</span> <span class="ident">rest</span> <span class="op">=</span> <span class="ident">whitespace::skip</span>(<span class="kw-2">&amp;</span><span class="ident">content</span>[<span class="number">2</span>..]);
         <span class="kw">if</span> <span class="op">!</span><span class="ident">rest</span>.<span class="ident">starts_with</span>(<span class="string">&#39;[&#39;</span>) {
             <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">idx</span>) <span class="op">=</span> <span class="ident">content</span>.<span class="ident">find</span>(<span class="string">&#39;\n&#39;</span>) {
                 <span class="ident">shebang</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">content</span>[..<span class="ident">idx</span>].<span class="ident">to_string</span>());
                 <span class="ident">content</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">content</span>[<span class="ident">idx</span>..];
             } <span class="kw">else</span> {
                 <span class="ident">shebang</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">content</span>.<span class="ident">to_string</span>());
                 <span class="ident">content</span> <span class="op">=</span> <span class="string">&quot;&quot;</span>;
             }
         }
     }

     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span>: <span class="ident">File</span> <span class="op">=</span> <span class="ident">parse_str</span>(<span class="ident">content</span>)<span class="question-mark">?</span>;
     <span class="ident">file</span>.<span class="ident">shebang</span> <span class="op">=</span> <span class="ident">shebang</span>;
     <span class="prelude-val">Ok</span>(<span class="ident">file</span>)
 }
 </code></pre></div>
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