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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.59/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../proc_macro2/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../proc_macro2/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="doccomment">//! [![github]](https://github.com/dtolnay/proc-macro2)&amp;ensp;[![crates-io]](https://crates.io/crates/proc-macro2)&amp;ensp;[![docs-rs]](crate)
 //!
 //! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&amp;labelColor=555555&amp;logo=github
 //! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&amp;labelColor=555555&amp;logo=rust
 //! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&amp;labelColor=555555&amp;logo=docs.rs
 //!
 //! &lt;br&gt;
 //!
 //! A wrapper around the procedural macro API of the compiler&#39;s [`proc_macro`]
 //! crate. This library serves two purposes:
 //!
 //! [`proc_macro`]: https://doc.rust-lang.org/proc_macro/
 //!
 //! - **Bring proc-macro-like functionality to other contexts like build.rs and
 //!   main.rs.** Types from `proc_macro` are entirely specific to procedural
 //!   macros and cannot ever exist in code outside of a procedural macro.
 //!   Meanwhile `proc_macro2` types may exist anywhere including non-macro code.
 //!   By developing foundational libraries like [syn] and [quote] against
 //!   `proc_macro2` rather than `proc_macro`, the procedural macro ecosystem
 //!   becomes easily applicable to many other use cases and we avoid
 //!   reimplementing non-macro equivalents of those libraries.
 //!
 //! - **Make procedural macros unit testable.** As a consequence of being
 //!   specific to procedural macros, nothing that uses `proc_macro` can be
 //!   executed from a unit test. In order for helper libraries or components of
 //!   a macro to be testable in isolation, they must be implemented using
 //!   `proc_macro2`.
 //!
 //! [syn]: https://github.com/dtolnay/syn
 //! [quote]: https://github.com/dtolnay/quote
 //!
 //! # Usage
 //!
 //! The skeleton of a typical procedural macro typically looks like this:
 //!
 //! ```
 //! extern crate proc_macro;
 //!
 //! # const IGNORE: &amp;str = stringify! {
 //! #[proc_macro_derive(MyDerive)]
 //! # };
 //! # #[cfg(wrap_proc_macro)]
 //! pub fn my_derive(input: proc_macro::TokenStream) -&gt; proc_macro::TokenStream {
 //!     let input = proc_macro2::TokenStream::from(input);
 //!
 //!     let output: proc_macro2::TokenStream = {
 //!         /* transform input */
 //!         # input
 //!     };
 //!
 //!     proc_macro::TokenStream::from(output)
 //! }
 //! ```
 //!
 //! If parsing with [Syn], you&#39;ll use [`parse_macro_input!`] instead to
 //! propagate parse errors correctly back to the compiler when parsing fails.
 //!
 //! [`parse_macro_input!`]: https://docs.rs/syn/1.0/syn/macro.parse_macro_input.html
 //!
 //! # Unstable features
 //!
 //! The default feature set of proc-macro2 tracks the most recent stable
 //! compiler API. Functionality in `proc_macro` that is not yet stable is not
 //! exposed by proc-macro2 by default.
 //!
 //! To opt into the additional APIs available in the most recent nightly
 //! compiler, the `procmacro2_semver_exempt` config flag must be passed to
 //! rustc. We will polyfill those nightly-only APIs back to Rust 1.31.0. As
 //! these are unstable APIs that track the nightly compiler, minor versions of
 //! proc-macro2 may make breaking changes to them at any time.
 //!
 //! ```sh
 //! RUSTFLAGS=&#39;--cfg procmacro2_semver_exempt&#39; cargo build
 //! ```
 //!
 //! Note that this must not only be done for your crate, but for any crate that
 //! depends on your crate. This infectious nature is intentional, as it serves
 //! as a reminder that you are outside of the normal semver guarantees.
 //!
 //! Semver exempt methods are marked as such in the proc-macro2 documentation.
 //!
 //! # Thread-Safety
 //!
 //! Most types in this crate are `!Sync` because the underlying compiler
 //! types make use of thread-local memory, meaning they cannot be accessed from
 //! a different thread.

 </span><span class="comment">// Proc-macro2 types in rustdoc of other crates get linked to here.
 </span><span class="attribute">#![doc(html_root_url = <span class="string">&quot;https://docs.rs/proc-macro2/1.0.59&quot;</span>)]
 #![cfg_attr(
     any(proc_macro_span, super_unstable),
     feature(proc_macro_span, proc_macro_span_shrink)
 )]
 #![cfg_attr(super_unstable, feature(proc_macro_def_site))]
 #![cfg_attr(doc_cfg, feature(doc_cfg))]
 #![allow(
     clippy::cast_lossless,
     clippy::cast_possible_truncation,
     clippy::doc_markdown,
     clippy::items_after_statements,
     clippy::let_underscore_untyped,
     clippy::manual_assert,
     clippy::must_use_candidate,
     clippy::needless_doctest_main,
     clippy::new_without_default,
     clippy::return_self_not_must_use,
     clippy::shadow_unrelated,
     clippy::trivially_copy_pass_by_ref,
     clippy::unnecessary_wraps,
     clippy::unused_self,
     clippy::used_underscore_binding,
     clippy::vec_init_then_push
 )]

 #[cfg(all(procmacro2_semver_exempt, wrap_proc_macro, not(super_unstable)))]
 </span><span class="macro">compile_error! </span>{<span class="string">&quot;\
     Something is not right. If you&#39;ve tried to turn on \
     procmacro2_semver_exempt, you need to ensure that it \
     is turned on for the compilation of the proc-macro2 \
     build script as well.
 &quot;</span>}

 <span class="attribute">#[cfg(feature = <span class="string">&quot;proc-macro&quot;</span>)]
 </span><span class="kw">extern crate </span>proc_macro;

 <span class="kw">mod </span>marker;
 <span class="kw">mod </span>parse;
 <span class="kw">mod </span>rcvec;

 <span class="attribute">#[cfg(wrap_proc_macro)]
 </span><span class="kw">mod </span>detection;

 <span class="comment">// Public for proc_macro2::fallback::force() and unforce(), but those are quite
 // a niche use case so we omit it from rustdoc.
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub mod </span>fallback;

 <span class="kw">pub mod </span>extra;

 <span class="attribute">#[cfg(not(wrap_proc_macro))]
 </span><span class="kw">use </span><span class="kw">crate</span>::fallback <span class="kw">as </span>imp;
 <span class="attribute">#[path = <span class="string">&quot;wrapper.rs&quot;</span>]
 #[cfg(wrap_proc_macro)]
 </span><span class="kw">mod </span>imp;

 <span class="attribute">#[cfg(span_locations)]
 </span><span class="kw">mod </span>convert;
 <span class="attribute">#[cfg(span_locations)]
 </span><span class="kw">mod </span>location;

 <span class="kw">use </span><span class="kw">crate</span>::extra::DelimSpan;
 <span class="kw">use </span><span class="kw">crate</span>::marker::Marker;
 <span class="kw">use </span>core::cmp::Ordering;
 <span class="kw">use </span>core::fmt::{<span class="self">self</span>, Debug, Display};
 <span class="kw">use </span>core::hash::{Hash, Hasher};
 <span class="kw">use </span>core::iter::FromIterator;
 <span class="kw">use </span>core::ops::RangeBounds;
 <span class="kw">use </span>core::str::FromStr;
 <span class="kw">use </span>std::error::Error;
 <span class="attribute">#[cfg(procmacro2_semver_exempt)]
 </span><span class="kw">use </span>std::path::PathBuf;

 <span class="attribute">#[cfg(span_locations)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::location::LineColumn;

 <span class="doccomment">/// An abstract stream of tokens, or more concretely a sequence of token trees.
 ///
 /// This type provides interfaces for iterating over token trees and for
 /// collecting token trees into one stream.
 ///
 /// Token stream is both the input and output of `#[proc_macro]`,
 /// `#[proc_macro_attribute]` and `#[proc_macro_derive]` definitions.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>TokenStream {
     inner: imp::TokenStream,
     _marker: Marker,
 }

 <span class="doccomment">/// Error returned from `TokenStream::from_str`.
 </span><span class="kw">pub struct </span>LexError {
     inner: imp::LexError,
     _marker: Marker,
 }

 <span class="kw">impl </span>TokenStream {
     <span class="kw">fn </span>_new(inner: imp::TokenStream) -&gt; <span class="self">Self </span>{
         TokenStream {
             inner,
             _marker: Marker,
         }
     }

     <span class="kw">fn </span>_new_fallback(inner: fallback::TokenStream) -&gt; <span class="self">Self </span>{
         TokenStream {
             inner: inner.into(),
             _marker: Marker,
         }
     }

     <span class="doccomment">/// Returns an empty `TokenStream` containing no token trees.
     </span><span class="kw">pub fn </span>new() -&gt; <span class="self">Self </span>{
         TokenStream::_new(imp::TokenStream::new())
     }

     <span class="doccomment">/// Checks if this `TokenStream` is empty.
     </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.inner.is_empty()
     }
 }

 <span class="doccomment">/// `TokenStream::default()` returns an empty stream,
 /// i.e. this is equivalent with `TokenStream::new()`.
 </span><span class="kw">impl </span>Default <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
         TokenStream::new()
     }
 }

 <span class="doccomment">/// Attempts to break the string into tokens and parse those tokens into a token
 /// stream.
 ///
 /// May fail for a number of reasons, for example, if the string contains
 /// unbalanced delimiters or characters not existing in the language.
 ///
 /// NOTE: Some errors may cause panics instead of returning `LexError`. We
 /// reserve the right to change these errors into `LexError`s later.
 </span><span class="kw">impl </span>FromStr <span class="kw">for </span>TokenStream {
     <span class="kw">type </span><span class="prelude-val">Err </span>= LexError;

     <span class="kw">fn </span>from_str(src: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;TokenStream, LexError&gt; {
         <span class="kw">let </span>e = src.parse().map_err(|e| LexError {
             inner: e,
             _marker: Marker,
         })<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(TokenStream::_new(e))
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;proc-macro&quot;</span>)]
 #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">&quot;proc-macro&quot;</span>)))]
 </span><span class="kw">impl </span>From&lt;proc_macro::TokenStream&gt; <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>from(inner: proc_macro::TokenStream) -&gt; <span class="self">Self </span>{
         TokenStream::_new(inner.into())
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;proc-macro&quot;</span>)]
 #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">&quot;proc-macro&quot;</span>)))]
 </span><span class="kw">impl </span>From&lt;TokenStream&gt; <span class="kw">for </span>proc_macro::TokenStream {
     <span class="kw">fn </span>from(inner: TokenStream) -&gt; <span class="self">Self </span>{
         inner.inner.into()
     }
 }

 <span class="kw">impl </span>From&lt;TokenTree&gt; <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>from(token: TokenTree) -&gt; <span class="self">Self </span>{
         TokenStream::_new(imp::TokenStream::from(token))
     }
 }

 <span class="kw">impl </span>Extend&lt;TokenTree&gt; <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>extend&lt;I: IntoIterator&lt;Item = TokenTree&gt;&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, streams: I) {
         <span class="self">self</span>.inner.extend(streams);
     }
 }

 <span class="kw">impl </span>Extend&lt;TokenStream&gt; <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>extend&lt;I: IntoIterator&lt;Item = TokenStream&gt;&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, streams: I) {
         <span class="self">self</span>.inner
             .extend(streams.into_iter().map(|stream| stream.inner));
     }
 }

 <span class="doccomment">/// Collects a number of token trees into a single stream.
 </span><span class="kw">impl </span>FromIterator&lt;TokenTree&gt; <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>from_iter&lt;I: IntoIterator&lt;Item = TokenTree&gt;&gt;(streams: I) -&gt; <span class="self">Self </span>{
         TokenStream::_new(streams.into_iter().collect())
     }
 }
 <span class="kw">impl </span>FromIterator&lt;TokenStream&gt; <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>from_iter&lt;I: IntoIterator&lt;Item = TokenStream&gt;&gt;(streams: I) -&gt; <span class="self">Self </span>{
         TokenStream::_new(streams.into_iter().map(|i| i.inner).collect())
     }
 }

 <span class="doccomment">/// Prints the token stream as a string that is supposed to be losslessly
 /// convertible back into the same token stream (modulo spans), except for
 /// possibly `TokenTree::Group`s with `Delimiter::None` delimiters and negative
 /// numeric literals.
 </span><span class="kw">impl </span>Display <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Display::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, f)
     }
 }

 <span class="doccomment">/// Prints token in a form convenient for debugging.
 </span><span class="kw">impl </span>Debug <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Debug::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, f)
     }
 }

 <span class="kw">impl </span>LexError {
     <span class="kw">pub fn </span>span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         Span::_new(<span class="self">self</span>.inner.span())
     }
 }

 <span class="kw">impl </span>Debug <span class="kw">for </span>LexError {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Debug::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, f)
     }
 }

 <span class="kw">impl </span>Display <span class="kw">for </span>LexError {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Display::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, f)
     }
 }

 <span class="kw">impl </span>Error <span class="kw">for </span>LexError {}

 <span class="doccomment">/// The source file of a given `Span`.
 ///
 /// This type is semver exempt and not exposed by default.
 </span><span class="attribute">#[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))]
 #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))]
 #[derive(Clone, PartialEq, Eq)]
 </span><span class="kw">pub struct </span>SourceFile {
     inner: imp::SourceFile,
     _marker: Marker,
 }

 <span class="attribute">#[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))]
 </span><span class="kw">impl </span>SourceFile {
     <span class="kw">fn </span>_new(inner: imp::SourceFile) -&gt; <span class="self">Self </span>{
         SourceFile {
             inner,
             _marker: Marker,
         }
     }

     <span class="doccomment">/// Get the path to this source file.
     ///
     /// ### Note
     ///
     /// If the code span associated with this `SourceFile` was generated by an
     /// external macro, this may not be an actual path on the filesystem. Use
     /// [`is_real`] to check.
     ///
     /// Also note that even if `is_real` returns `true`, if
     /// `--remap-path-prefix` was passed on the command line, the path as given
     /// may not actually be valid.
     ///
     /// [`is_real`]: #method.is_real
     </span><span class="kw">pub fn </span>path(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; PathBuf {
         <span class="self">self</span>.inner.path()
     }

     <span class="doccomment">/// Returns `true` if this source file is a real source file, and not
     /// generated by an external macro&#39;s expansion.
     </span><span class="kw">pub fn </span>is_real(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.inner.is_real()
     }
 }

 <span class="attribute">#[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))]
 </span><span class="kw">impl </span>Debug <span class="kw">for </span>SourceFile {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Debug::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, f)
     }
 }

 <span class="doccomment">/// A region of source code, along with macro expansion information.
 </span><span class="attribute">#[derive(Copy, Clone)]
 </span><span class="kw">pub struct </span>Span {
     inner: imp::Span,
     _marker: Marker,
 }

 <span class="kw">impl </span>Span {
     <span class="kw">fn </span>_new(inner: imp::Span) -&gt; <span class="self">Self </span>{
         Span {
             inner,
             _marker: Marker,
         }
     }

     <span class="kw">fn </span>_new_fallback(inner: fallback::Span) -&gt; <span class="self">Self </span>{
         Span {
             inner: inner.into(),
             _marker: Marker,
         }
     }

     <span class="doccomment">/// The span of the invocation of the current procedural macro.
     ///
     /// Identifiers created with this span will be resolved as if they were
     /// written directly at the macro call location (call-site hygiene) and
     /// other code at the macro call site will be able to refer to them as well.
     </span><span class="kw">pub fn </span>call_site() -&gt; <span class="self">Self </span>{
         Span::_new(imp::Span::call_site())
     }

     <span class="doccomment">/// The span located at the invocation of the procedural macro, but with
     /// local variables, labels, and `$crate` resolved at the definition site
     /// of the macro. This is the same hygiene behavior as `macro_rules`.
     ///
     /// This function requires Rust 1.45 or later.
     </span><span class="attribute">#[cfg(not(no_hygiene))]
     </span><span class="kw">pub fn </span>mixed_site() -&gt; <span class="self">Self </span>{
         Span::_new(imp::Span::mixed_site())
     }

     <span class="doccomment">/// A span that resolves at the macro definition site.
     ///
     /// This method is semver exempt and not exposed by default.
     </span><span class="attribute">#[cfg(procmacro2_semver_exempt)]
     #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))]
     </span><span class="kw">pub fn </span>def_site() -&gt; <span class="self">Self </span>{
         Span::_new(imp::Span::def_site())
     }

     <span class="doccomment">/// Creates a new span with the same line/column information as `self` but
     /// that resolves symbols as though it were at `other`.
     </span><span class="kw">pub fn </span>resolved_at(<span class="kw-2">&amp;</span><span class="self">self</span>, other: Span) -&gt; Span {
         Span::_new(<span class="self">self</span>.inner.resolved_at(other.inner))
     }

     <span class="doccomment">/// Creates a new span with the same name resolution behavior as `self` but
     /// with the line/column information of `other`.
     </span><span class="kw">pub fn </span>located_at(<span class="kw-2">&amp;</span><span class="self">self</span>, other: Span) -&gt; Span {
         Span::_new(<span class="self">self</span>.inner.located_at(other.inner))
     }

     <span class="doccomment">/// Convert `proc_macro2::Span` to `proc_macro::Span`.
     ///
     /// This method is available when building with a nightly compiler, or when
     /// building with rustc 1.29+ *without* semver exempt features.
     ///
     /// # Panics
     ///
     /// Panics if called from outside of a procedural macro. Unlike
     /// `proc_macro2::Span`, the `proc_macro::Span` type can only exist within
     /// the context of a procedural macro invocation.
     </span><span class="attribute">#[cfg(wrap_proc_macro)]
     </span><span class="kw">pub fn </span>unwrap(<span class="self">self</span>) -&gt; proc_macro::Span {
         <span class="self">self</span>.inner.unwrap()
     }

     <span class="comment">// Soft deprecated. Please use Span::unwrap.
     </span><span class="attribute">#[cfg(wrap_proc_macro)]
     #[doc(hidden)]
     </span><span class="kw">pub fn </span>unstable(<span class="self">self</span>) -&gt; proc_macro::Span {
         <span class="self">self</span>.unwrap()
     }

     <span class="doccomment">/// The original source file into which this span points.
     ///
     /// This method is semver exempt and not exposed by default.
     </span><span class="attribute">#[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))]
     #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))]
     </span><span class="kw">pub fn </span>source_file(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; SourceFile {
         SourceFile::_new(<span class="self">self</span>.inner.source_file())
     }

     <span class="doccomment">/// Get the starting line/column in the source file for this span.
     ///
     /// This method requires the `&quot;span-locations&quot;` feature to be enabled.
     ///
     /// When executing in a procedural macro context, the returned line/column
     /// are only meaningful if compiled with a nightly toolchain. The stable
     /// toolchain does not have this information available. When executing
     /// outside of a procedural macro, such as main.rs or build.rs, the
     /// line/column are always meaningful regardless of toolchain.
     </span><span class="attribute">#[cfg(span_locations)]
     #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">&quot;span-locations&quot;</span>)))]
     </span><span class="kw">pub fn </span>start(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; LineColumn {
         <span class="self">self</span>.inner.start()
     }

     <span class="doccomment">/// Get the ending line/column in the source file for this span.
     ///
     /// This method requires the `&quot;span-locations&quot;` feature to be enabled.
     ///
     /// When executing in a procedural macro context, the returned line/column
     /// are only meaningful if compiled with a nightly toolchain. The stable
     /// toolchain does not have this information available. When executing
     /// outside of a procedural macro, such as main.rs or build.rs, the
     /// line/column are always meaningful regardless of toolchain.
     </span><span class="attribute">#[cfg(span_locations)]
     #[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">&quot;span-locations&quot;</span>)))]
     </span><span class="kw">pub fn </span>end(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; LineColumn {
         <span class="self">self</span>.inner.end()
     }

     <span class="doccomment">/// Creates an empty span pointing to directly before this span.
     ///
     /// This method is semver exempt and not exposed by default.
     </span><span class="attribute">#[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))]
     #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))]
     </span><span class="kw">pub fn </span>before(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         Span::_new(<span class="self">self</span>.inner.before())
     }

     <span class="doccomment">/// Creates an empty span pointing to directly after this span.
     ///
     /// This method is semver exempt and not exposed by default.
     </span><span class="attribute">#[cfg(all(procmacro2_semver_exempt, any(not(wrap_proc_macro), super_unstable)))]
     #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))]
     </span><span class="kw">pub fn </span>after(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         Span::_new(<span class="self">self</span>.inner.after())
     }

     <span class="doccomment">/// Create a new span encompassing `self` and `other`.
     ///
     /// Returns `None` if `self` and `other` are from different files.
     ///
     /// Warning: the underlying [`proc_macro::Span::join`] method is
     /// nightly-only. When called from within a procedural macro not using a
     /// nightly compiler, this method will always return `None`.
     ///
     /// [`proc_macro::Span::join`]: https://doc.rust-lang.org/proc_macro/struct.Span.html#method.join
     </span><span class="kw">pub fn </span>join(<span class="kw-2">&amp;</span><span class="self">self</span>, other: Span) -&gt; <span class="prelude-ty">Option</span>&lt;Span&gt; {
         <span class="self">self</span>.inner.join(other.inner).map(Span::_new)
     }

     <span class="doccomment">/// Compares two spans to see if they&#39;re equal.
     ///
     /// This method is semver exempt and not exposed by default.
     </span><span class="attribute">#[cfg(procmacro2_semver_exempt)]
     #[cfg_attr(doc_cfg, doc(cfg(procmacro2_semver_exempt)))]
     </span><span class="kw">pub fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Span) -&gt; bool {
         <span class="self">self</span>.inner.eq(<span class="kw-2">&amp;</span>other.inner)
     }

     <span class="doccomment">/// Returns the source text behind a span. This preserves the original
     /// source code, including spaces and comments. It only returns a result if
     /// the span corresponds to real source code.
     ///
     /// Note: The observable result of a macro should only rely on the tokens
     /// and not on this source text. The result of this function is a best
     /// effort to be used for diagnostics only.
     </span><span class="kw">pub fn </span>source_text(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;String&gt; {
         <span class="self">self</span>.inner.source_text()
     }
 }

 <span class="doccomment">/// Prints a span in a form convenient for debugging.
 </span><span class="kw">impl </span>Debug <span class="kw">for </span>Span {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Debug::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, f)
     }
 }

 <span class="doccomment">/// A single token or a delimited sequence of token trees (e.g. `[1, (), ..]`).
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub enum </span>TokenTree {
     <span class="doccomment">/// A token stream surrounded by bracket delimiters.
     </span>Group(Group),
     <span class="doccomment">/// An identifier.
     </span>Ident(Ident),
     <span class="doccomment">/// A single punctuation character (`+`, `,`, `$`, etc.).
     </span>Punct(Punct),
     <span class="doccomment">/// A literal character (`&#39;a&#39;`), string (`&quot;hello&quot;`), number (`2.3`), etc.
     </span>Literal(Literal),
 }

 <span class="kw">impl </span>TokenTree {
     <span class="doccomment">/// Returns the span of this tree, delegating to the `span` method of
     /// the contained token or a delimited stream.
     </span><span class="kw">pub fn </span>span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         <span class="kw">match </span><span class="self">self </span>{
             TokenTree::Group(t) =&gt; t.span(),
             TokenTree::Ident(t) =&gt; t.span(),
             TokenTree::Punct(t) =&gt; t.span(),
             TokenTree::Literal(t) =&gt; t.span(),
         }
     }

     <span class="doccomment">/// Configures the span for *only this token*.
     ///
     /// Note that if this token is a `Group` then this method will not configure
     /// the span of each of the internal tokens, this will simply delegate to
     /// the `set_span` method of each variant.
     </span><span class="kw">pub fn </span>set_span(<span class="kw-2">&amp;mut </span><span class="self">self</span>, span: Span) {
         <span class="kw">match </span><span class="self">self </span>{
             TokenTree::Group(t) =&gt; t.set_span(span),
             TokenTree::Ident(t) =&gt; t.set_span(span),
             TokenTree::Punct(t) =&gt; t.set_span(span),
             TokenTree::Literal(t) =&gt; t.set_span(span),
         }
     }
 }

 <span class="kw">impl </span>From&lt;Group&gt; <span class="kw">for </span>TokenTree {
     <span class="kw">fn </span>from(g: Group) -&gt; <span class="self">Self </span>{
         TokenTree::Group(g)
     }
 }

 <span class="kw">impl </span>From&lt;Ident&gt; <span class="kw">for </span>TokenTree {
     <span class="kw">fn </span>from(g: Ident) -&gt; <span class="self">Self </span>{
         TokenTree::Ident(g)
     }
 }

 <span class="kw">impl </span>From&lt;Punct&gt; <span class="kw">for </span>TokenTree {
     <span class="kw">fn </span>from(g: Punct) -&gt; <span class="self">Self </span>{
         TokenTree::Punct(g)
     }
 }

 <span class="kw">impl </span>From&lt;Literal&gt; <span class="kw">for </span>TokenTree {
     <span class="kw">fn </span>from(g: Literal) -&gt; <span class="self">Self </span>{
         TokenTree::Literal(g)
     }
 }

 <span class="doccomment">/// Prints the token tree as a string that is supposed to be losslessly
 /// convertible back into the same token tree (modulo spans), except for
 /// possibly `TokenTree::Group`s with `Delimiter::None` delimiters and negative
 /// numeric literals.
 </span><span class="kw">impl </span>Display <span class="kw">for </span>TokenTree {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="kw">match </span><span class="self">self </span>{
             TokenTree::Group(t) =&gt; Display::fmt(t, f),
             TokenTree::Ident(t) =&gt; Display::fmt(t, f),
             TokenTree::Punct(t) =&gt; Display::fmt(t, f),
             TokenTree::Literal(t) =&gt; Display::fmt(t, f),
         }
     }
 }

 <span class="doccomment">/// Prints token tree in a form convenient for debugging.
 </span><span class="kw">impl </span>Debug <span class="kw">for </span>TokenTree {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="comment">// Each of these has the name in the struct type in the derived debug,
         // so don&#39;t bother with an extra layer of indirection
         </span><span class="kw">match </span><span class="self">self </span>{
             TokenTree::Group(t) =&gt; Debug::fmt(t, f),
             TokenTree::Ident(t) =&gt; {
                 <span class="kw">let </span><span class="kw-2">mut </span>debug = f.debug_struct(<span class="string">&quot;Ident&quot;</span>);
                 debug.field(<span class="string">&quot;sym&quot;</span>, <span class="kw-2">&amp;</span><span class="macro">format_args!</span>(<span class="string">&quot;{}&quot;</span>, t));
                 imp::debug_span_field_if_nontrivial(<span class="kw-2">&amp;mut </span>debug, t.span().inner);
                 debug.finish()
             }
             TokenTree::Punct(t) =&gt; Debug::fmt(t, f),
             TokenTree::Literal(t) =&gt; Debug::fmt(t, f),
         }
     }
 }

 <span class="doccomment">/// A delimited token stream.
 ///
 /// A `Group` internally contains a `TokenStream` which is surrounded by
 /// `Delimiter`s.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>Group {
     inner: imp::Group,
 }

 <span class="doccomment">/// Describes how a sequence of token trees is delimited.
 </span><span class="attribute">#[derive(Copy, Clone, Debug, Eq, PartialEq)]
 </span><span class="kw">pub enum </span>Delimiter {
     <span class="doccomment">/// `( ... )`
     </span>Parenthesis,
     <span class="doccomment">/// `{ ... }`
     </span>Brace,
     <span class="doccomment">/// `[ ... ]`
     </span>Bracket,
     <span class="doccomment">/// `Ø ... Ø`
     ///
     /// An implicit delimiter, that may, for example, appear around tokens
     /// coming from a &quot;macro variable&quot; `$var`. It is important to preserve
     /// operator priorities in cases like `$var * 3` where `$var` is `1 + 2`.
     /// Implicit delimiters may not survive roundtrip of a token stream through
     /// a string.
     </span><span class="prelude-val">None</span>,
 }

 <span class="kw">impl </span>Group {
     <span class="kw">fn </span>_new(inner: imp::Group) -&gt; <span class="self">Self </span>{
         Group { inner }
     }

     <span class="kw">fn </span>_new_fallback(inner: fallback::Group) -&gt; <span class="self">Self </span>{
         Group {
             inner: inner.into(),
         }
     }

     <span class="doccomment">/// Creates a new `Group` with the given delimiter and token stream.
     ///
     /// This constructor will set the span for this group to
     /// `Span::call_site()`. To change the span you can use the `set_span`
     /// method below.
     </span><span class="kw">pub fn </span>new(delimiter: Delimiter, stream: TokenStream) -&gt; <span class="self">Self </span>{
         Group {
             inner: imp::Group::new(delimiter, stream.inner),
         }
     }

     <span class="doccomment">/// Returns the punctuation used as the delimiter for this group: a set of
     /// parentheses, square brackets, or curly braces.
     </span><span class="kw">pub fn </span>delimiter(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Delimiter {
         <span class="self">self</span>.inner.delimiter()
     }

     <span class="doccomment">/// Returns the `TokenStream` of tokens that are delimited in this `Group`.
     ///
     /// Note that the returned token stream does not include the delimiter
     /// returned above.
     </span><span class="kw">pub fn </span>stream(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
         TokenStream::_new(<span class="self">self</span>.inner.stream())
     }

     <span class="doccomment">/// Returns the span for the delimiters of this token stream, spanning the
     /// entire `Group`.
     ///
     /// ```text
     /// pub fn span(&amp;self) -&gt; Span {
     ///            ^^^^^^^
     /// ```
     </span><span class="kw">pub fn </span>span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         Span::_new(<span class="self">self</span>.inner.span())
     }

     <span class="doccomment">/// Returns the span pointing to the opening delimiter of this group.
     ///
     /// ```text
     /// pub fn span_open(&amp;self) -&gt; Span {
     ///                 ^
     /// ```
     </span><span class="kw">pub fn </span>span_open(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         Span::_new(<span class="self">self</span>.inner.span_open())
     }

     <span class="doccomment">/// Returns the span pointing to the closing delimiter of this group.
     ///
     /// ```text
     /// pub fn span_close(&amp;self) -&gt; Span {
     ///                        ^
     /// ```
     </span><span class="kw">pub fn </span>span_close(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         Span::_new(<span class="self">self</span>.inner.span_close())
     }

     <span class="doccomment">/// Returns an object that holds this group&#39;s `span_open()` and
     /// `span_close()` together (in a more compact representation than holding
     /// those 2 spans individually).
     </span><span class="kw">pub fn </span>delim_span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; DelimSpan {
         DelimSpan::new(<span class="kw-2">&amp;</span><span class="self">self</span>.inner)
     }

     <span class="doccomment">/// Configures the span for this `Group`&#39;s delimiters, but not its internal
     /// tokens.
     ///
     /// This method will **not** set the span of all the internal tokens spanned
     /// by this group, but rather it will only set the span of the delimiter
     /// tokens at the level of the `Group`.
     </span><span class="kw">pub fn </span>set_span(<span class="kw-2">&amp;mut </span><span class="self">self</span>, span: Span) {
         <span class="self">self</span>.inner.set_span(span.inner);
     }
 }

 <span class="doccomment">/// Prints the group as a string that should be losslessly convertible back
 /// into the same group (modulo spans), except for possibly `TokenTree::Group`s
 /// with `Delimiter::None` delimiters.
 </span><span class="kw">impl </span>Display <span class="kw">for </span>Group {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Display::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, formatter)
     }
 }

 <span class="kw">impl </span>Debug <span class="kw">for </span>Group {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Debug::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, formatter)
     }
 }

 <span class="doccomment">/// A `Punct` is a single punctuation character like `+`, `-` or `#`.
 ///
 /// Multicharacter operators like `+=` are represented as two instances of
 /// `Punct` with different forms of `Spacing` returned.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>Punct {
     ch: char,
     spacing: Spacing,
     span: Span,
 }

 <span class="doccomment">/// Whether a `Punct` is followed immediately by another `Punct` or followed by
 /// another token or whitespace.
 </span><span class="attribute">#[derive(Copy, Clone, Debug, Eq, PartialEq)]
 </span><span class="kw">pub enum </span>Spacing {
     <span class="doccomment">/// E.g. `+` is `Alone` in `+ =`, `+ident` or `+()`.
     </span>Alone,
     <span class="doccomment">/// E.g. `+` is `Joint` in `+=` or `&#39;` is `Joint` in `&#39;#`.
     ///
     /// Additionally, single quote `&#39;` can join with identifiers to form
     /// lifetimes `&#39;ident`.
     </span>Joint,
 }

 <span class="kw">impl </span>Punct {
     <span class="doccomment">/// Creates a new `Punct` from the given character and spacing.
     ///
     /// The `ch` argument must be a valid punctuation character permitted by the
     /// language, otherwise the function will panic.
     ///
     /// The returned `Punct` will have the default span of `Span::call_site()`
     /// which can be further configured with the `set_span` method below.
     </span><span class="kw">pub fn </span>new(ch: char, spacing: Spacing) -&gt; <span class="self">Self </span>{
         Punct {
             ch,
             spacing,
             span: Span::call_site(),
         }
     }

     <span class="doccomment">/// Returns the value of this punctuation character as `char`.
     </span><span class="kw">pub fn </span>as_char(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; char {
         <span class="self">self</span>.ch
     }

     <span class="doccomment">/// Returns the spacing of this punctuation character, indicating whether
     /// it&#39;s immediately followed by another `Punct` in the token stream, so
     /// they can potentially be combined into a multicharacter operator
     /// (`Joint`), or it&#39;s followed by some other token or whitespace (`Alone`)
     /// so the operator has certainly ended.
     </span><span class="kw">pub fn </span>spacing(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Spacing {
         <span class="self">self</span>.spacing
     }

     <span class="doccomment">/// Returns the span for this punctuation character.
     </span><span class="kw">pub fn </span>span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         <span class="self">self</span>.span
     }

     <span class="doccomment">/// Configure the span for this punctuation character.
     </span><span class="kw">pub fn </span>set_span(<span class="kw-2">&amp;mut </span><span class="self">self</span>, span: Span) {
         <span class="self">self</span>.span = span;
     }
 }

 <span class="doccomment">/// Prints the punctuation character as a string that should be losslessly
 /// convertible back into the same character.
 </span><span class="kw">impl </span>Display <span class="kw">for </span>Punct {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Display::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.ch, f)
     }
 }

 <span class="kw">impl </span>Debug <span class="kw">for </span>Punct {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="kw">let </span><span class="kw-2">mut </span>debug = fmt.debug_struct(<span class="string">&quot;Punct&quot;</span>);
         debug.field(<span class="string">&quot;char&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.ch);
         debug.field(<span class="string">&quot;spacing&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.spacing);
         imp::debug_span_field_if_nontrivial(<span class="kw-2">&amp;mut </span>debug, <span class="self">self</span>.span.inner);
         debug.finish()
     }
 }

 <span class="doccomment">/// A word of Rust code, which may be a keyword or legal variable name.
 ///
 /// An identifier consists of at least one Unicode code point, the first of
 /// which has the XID_Start property and the rest of which have the XID_Continue
 /// property.
 ///
 /// - The empty string is not an identifier. Use `Option&lt;Ident&gt;`.
 /// - A lifetime is not an identifier. Use `syn::Lifetime` instead.
 ///
 /// An identifier constructed with `Ident::new` is permitted to be a Rust
 /// keyword, though parsing one through its [`Parse`] implementation rejects
 /// Rust keywords. Use `input.call(Ident::parse_any)` when parsing to match the
 /// behaviour of `Ident::new`.
 ///
 /// [`Parse`]: https://docs.rs/syn/1.0/syn/parse/trait.Parse.html
 ///
 /// # Examples
 ///
 /// A new ident can be created from a string using the `Ident::new` function.
 /// A span must be provided explicitly which governs the name resolution
 /// behavior of the resulting identifier.
 ///
 /// ```
 /// use proc_macro2::{Ident, Span};
 ///
 /// fn main() {
 ///     let call_ident = Ident::new(&quot;calligraphy&quot;, Span::call_site());
 ///
 ///     println!(&quot;{}&quot;, call_ident);
 /// }
 /// ```
 ///
 /// An ident can be interpolated into a token stream using the `quote!` macro.
 ///
 /// ```
 /// use proc_macro2::{Ident, Span};
 /// use quote::quote;
 ///
 /// fn main() {
 ///     let ident = Ident::new(&quot;demo&quot;, Span::call_site());
 ///
 ///     // Create a variable binding whose name is this ident.
 ///     let expanded = quote! { let #ident = 10; };
 ///
 ///     // Create a variable binding with a slightly different name.
 ///     let temp_ident = Ident::new(&amp;format!(&quot;new_{}&quot;, ident), Span::call_site());
 ///     let expanded = quote! { let #temp_ident = 10; };
 /// }
 /// ```
 ///
 /// A string representation of the ident is available through the `to_string()`
 /// method.
 ///
 /// ```
 /// # use proc_macro2::{Ident, Span};
 /// #
 /// # let ident = Ident::new(&quot;another_identifier&quot;, Span::call_site());
 /// #
 /// // Examine the ident as a string.
 /// let ident_string = ident.to_string();
 /// if ident_string.len() &gt; 60 {
 ///     println!(&quot;Very long identifier: {}&quot;, ident_string)
 /// }
 /// ```
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>Ident {
     inner: imp::Ident,
     _marker: Marker,
 }

 <span class="kw">impl </span>Ident {
     <span class="kw">fn </span>_new(inner: imp::Ident) -&gt; <span class="self">Self </span>{
         Ident {
             inner,
             _marker: Marker,
         }
     }

     <span class="doccomment">/// Creates a new `Ident` with the given `string` as well as the specified
     /// `span`.
     ///
     /// The `string` argument must be a valid identifier permitted by the
     /// language, otherwise the function will panic.
     ///
     /// Note that `span`, currently in rustc, configures the hygiene information
     /// for this identifier.
     ///
     /// As of this time `Span::call_site()` explicitly opts-in to &quot;call-site&quot;
     /// hygiene meaning that identifiers created with this span will be resolved
     /// as if they were written directly at the location of the macro call, and
     /// other code at the macro call site will be able to refer to them as well.
     ///
     /// Later spans like `Span::def_site()` will allow to opt-in to
     /// &quot;definition-site&quot; hygiene meaning that identifiers created with this
     /// span will be resolved at the location of the macro definition and other
     /// code at the macro call site will not be able to refer to them.
     ///
     /// Due to the current importance of hygiene this constructor, unlike other
     /// tokens, requires a `Span` to be specified at construction.
     ///
     /// # Panics
     ///
     /// Panics if the input string is neither a keyword nor a legal variable
     /// name. If you are not sure whether the string contains an identifier and
     /// need to handle an error case, use
     /// &lt;a href=&quot;https://docs.rs/syn/1.0/syn/fn.parse_str.html&quot;&gt;&lt;code
     ///   style=&quot;padding-right:0;&quot;&gt;syn::parse_str&lt;/code&gt;&lt;/a&gt;&lt;code
     ///   style=&quot;padding-left:0;&quot;&gt;::&amp;lt;Ident&amp;gt;&lt;/code&gt;
     /// rather than `Ident::new`.
     </span><span class="kw">pub fn </span>new(string: <span class="kw-2">&amp;</span>str, span: Span) -&gt; <span class="self">Self </span>{
         Ident::_new(imp::Ident::new(string, span.inner))
     }

     <span class="doccomment">/// Same as `Ident::new`, but creates a raw identifier (`r#ident`). The
     /// `string` argument must be a valid identifier permitted by the language
     /// (including keywords, e.g. `fn`). Keywords which are usable in path
     /// segments (e.g. `self`, `super`) are not supported, and will cause a
     /// panic.
     </span><span class="kw">pub fn </span>new_raw(string: <span class="kw-2">&amp;</span>str, span: Span) -&gt; <span class="self">Self </span>{
         Ident::_new_raw(string, span)
     }

     <span class="kw">fn </span>_new_raw(string: <span class="kw-2">&amp;</span>str, span: Span) -&gt; <span class="self">Self </span>{
         Ident::_new(imp::Ident::new_raw(string, span.inner))
     }

     <span class="doccomment">/// Returns the span of this `Ident`.
     </span><span class="kw">pub fn </span>span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         Span::_new(<span class="self">self</span>.inner.span())
     }

     <span class="doccomment">/// Configures the span of this `Ident`, possibly changing its hygiene
     /// context.
     </span><span class="kw">pub fn </span>set_span(<span class="kw-2">&amp;mut </span><span class="self">self</span>, span: Span) {
         <span class="self">self</span>.inner.set_span(span.inner);
     }
 }

 <span class="kw">impl </span>PartialEq <span class="kw">for </span>Ident {
     <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Ident) -&gt; bool {
         <span class="self">self</span>.inner == other.inner
     }
 }

 <span class="kw">impl</span>&lt;T&gt; PartialEq&lt;T&gt; <span class="kw">for </span>Ident
 <span class="kw">where
     </span>T: <span class="question-mark">?</span>Sized + AsRef&lt;str&gt;,
 {
     <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>T) -&gt; bool {
         <span class="self">self</span>.inner == other
     }
 }

 <span class="kw">impl </span>Eq <span class="kw">for </span>Ident {}

 <span class="kw">impl </span>PartialOrd <span class="kw">for </span>Ident {
     <span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Ident) -&gt; <span class="prelude-ty">Option</span>&lt;Ordering&gt; {
         <span class="prelude-val">Some</span>(<span class="self">self</span>.cmp(other))
     }
 }

 <span class="kw">impl </span>Ord <span class="kw">for </span>Ident {
     <span class="kw">fn </span>cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Ident) -&gt; Ordering {
         <span class="self">self</span>.to_string().cmp(<span class="kw-2">&amp;</span>other.to_string())
     }
 }

 <span class="kw">impl </span>Hash <span class="kw">for </span>Ident {
     <span class="kw">fn </span>hash&lt;H: Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, hasher: <span class="kw-2">&amp;mut </span>H) {
         <span class="self">self</span>.to_string().hash(hasher);
     }
 }

 <span class="doccomment">/// Prints the identifier as a string that should be losslessly convertible back
 /// into the same identifier.
 </span><span class="kw">impl </span>Display <span class="kw">for </span>Ident {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Display::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, f)
     }
 }

 <span class="kw">impl </span>Debug <span class="kw">for </span>Ident {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Debug::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, f)
     }
 }

 <span class="doccomment">/// A literal string (`&quot;hello&quot;`), byte string (`b&quot;hello&quot;`), character (`&#39;a&#39;`),
 /// byte character (`b&#39;a&#39;`), an integer or floating point number with or without
 /// a suffix (`1`, `1u8`, `2.3`, `2.3f32`).
 ///
 /// Boolean literals like `true` and `false` do not belong here, they are
 /// `Ident`s.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>Literal {
     inner: imp::Literal,
     _marker: Marker,
 }

 <span class="macro">macro_rules! </span>suffixed_int_literals {
     ($(<span class="macro-nonterminal">$name</span>:ident =&gt; <span class="macro-nonterminal">$kind</span>:ident,)<span class="kw-2">*</span>) =&gt; ($(
         <span class="doccomment">/// Creates a new suffixed integer literal with the specified value.
         ///
         /// This function will create an integer like `1u32` where the integer
         /// value specified is the first part of the token and the integral is
         /// also suffixed at the end. Literals created from negative numbers may
         /// not survive roundtrips through `TokenStream` or strings and may be
         /// broken into two tokens (`-` and positive literal).
         ///
         /// Literals created through this method have the `Span::call_site()`
         /// span by default, which can be configured with the `set_span` method
         /// below.
         </span><span class="kw">pub fn </span><span class="macro-nonterminal">$name</span>(n: <span class="macro-nonterminal">$kind</span>) -&gt; Literal {
             Literal::_new(imp::Literal::<span class="macro-nonterminal">$name</span>(n))
         }
     )<span class="kw-2">*</span>)
 }

 <span class="macro">macro_rules! </span>unsuffixed_int_literals {
     ($(<span class="macro-nonterminal">$name</span>:ident =&gt; <span class="macro-nonterminal">$kind</span>:ident,)<span class="kw-2">*</span>) =&gt; ($(
         <span class="doccomment">/// Creates a new unsuffixed integer literal with the specified value.
         ///
         /// This function will create an integer like `1` where the integer
         /// value specified is the first part of the token. No suffix is
         /// specified on this token, meaning that invocations like
         /// `Literal::i8_unsuffixed(1)` are equivalent to
         /// `Literal::u32_unsuffixed(1)`. Literals created from negative numbers
         /// may not survive roundtrips through `TokenStream` or strings and may
         /// be broken into two tokens (`-` and positive literal).
         ///
         /// Literals created through this method have the `Span::call_site()`
         /// span by default, which can be configured with the `set_span` method
         /// below.
         </span><span class="kw">pub fn </span><span class="macro-nonterminal">$name</span>(n: <span class="macro-nonterminal">$kind</span>) -&gt; Literal {
             Literal::_new(imp::Literal::<span class="macro-nonterminal">$name</span>(n))
         }
     )<span class="kw-2">*</span>)
 }

 <span class="kw">impl </span>Literal {
     <span class="kw">fn </span>_new(inner: imp::Literal) -&gt; <span class="self">Self </span>{
         Literal {
             inner,
             _marker: Marker,
         }
     }

     <span class="kw">fn </span>_new_fallback(inner: fallback::Literal) -&gt; <span class="self">Self </span>{
         Literal {
             inner: inner.into(),
             _marker: Marker,
         }
     }

     <span class="macro">suffixed_int_literals! </span>{
         u8_suffixed =&gt; u8,
         u16_suffixed =&gt; u16,
         u32_suffixed =&gt; u32,
         u64_suffixed =&gt; u64,
         u128_suffixed =&gt; u128,
         usize_suffixed =&gt; usize,
         i8_suffixed =&gt; i8,
         i16_suffixed =&gt; i16,
         i32_suffixed =&gt; i32,
         i64_suffixed =&gt; i64,
         i128_suffixed =&gt; i128,
         isize_suffixed =&gt; isize,
     }

     <span class="macro">unsuffixed_int_literals! </span>{
         u8_unsuffixed =&gt; u8,
         u16_unsuffixed =&gt; u16,
         u32_unsuffixed =&gt; u32,
         u64_unsuffixed =&gt; u64,
         u128_unsuffixed =&gt; u128,
         usize_unsuffixed =&gt; usize,
         i8_unsuffixed =&gt; i8,
         i16_unsuffixed =&gt; i16,
         i32_unsuffixed =&gt; i32,
         i64_unsuffixed =&gt; i64,
         i128_unsuffixed =&gt; i128,
         isize_unsuffixed =&gt; isize,
     }

     <span class="doccomment">/// Creates a new unsuffixed floating-point literal.
     ///
     /// This constructor is similar to those like `Literal::i8_unsuffixed` where
     /// the float&#39;s value is emitted directly into the token but no suffix is
     /// used, so it may be inferred to be a `f64` later in the compiler.
     /// Literals created from negative numbers may not survive round-trips
     /// through `TokenStream` or strings and may be broken into two tokens (`-`
     /// and positive literal).
     ///
     /// # Panics
     ///
     /// This function requires that the specified float is finite, for example
     /// if it is infinity or NaN this function will panic.
     </span><span class="kw">pub fn </span>f64_unsuffixed(f: f64) -&gt; Literal {
         <span class="macro">assert!</span>(f.is_finite());
         Literal::_new(imp::Literal::f64_unsuffixed(f))
     }

     <span class="doccomment">/// Creates a new suffixed floating-point literal.
     ///
     /// This constructor will create a literal like `1.0f64` where the value
     /// specified is the preceding part of the token and `f64` is the suffix of
     /// the token. This token will always be inferred to be an `f64` in the
     /// compiler. Literals created from negative numbers may not survive
     /// round-trips through `TokenStream` or strings and may be broken into two
     /// tokens (`-` and positive literal).
     ///
     /// # Panics
     ///
     /// This function requires that the specified float is finite, for example
     /// if it is infinity or NaN this function will panic.
     </span><span class="kw">pub fn </span>f64_suffixed(f: f64) -&gt; Literal {
         <span class="macro">assert!</span>(f.is_finite());
         Literal::_new(imp::Literal::f64_suffixed(f))
     }

     <span class="doccomment">/// Creates a new unsuffixed floating-point literal.
     ///
     /// This constructor is similar to those like `Literal::i8_unsuffixed` where
     /// the float&#39;s value is emitted directly into the token but no suffix is
     /// used, so it may be inferred to be a `f64` later in the compiler.
     /// Literals created from negative numbers may not survive round-trips
     /// through `TokenStream` or strings and may be broken into two tokens (`-`
     /// and positive literal).
     ///
     /// # Panics
     ///
     /// This function requires that the specified float is finite, for example
     /// if it is infinity or NaN this function will panic.
     </span><span class="kw">pub fn </span>f32_unsuffixed(f: f32) -&gt; Literal {
         <span class="macro">assert!</span>(f.is_finite());
         Literal::_new(imp::Literal::f32_unsuffixed(f))
     }

     <span class="doccomment">/// Creates a new suffixed floating-point literal.
     ///
     /// This constructor will create a literal like `1.0f32` where the value
     /// specified is the preceding part of the token and `f32` is the suffix of
     /// the token. This token will always be inferred to be an `f32` in the
     /// compiler. Literals created from negative numbers may not survive
     /// round-trips through `TokenStream` or strings and may be broken into two
     /// tokens (`-` and positive literal).
     ///
     /// # Panics
     ///
     /// This function requires that the specified float is finite, for example
     /// if it is infinity or NaN this function will panic.
     </span><span class="kw">pub fn </span>f32_suffixed(f: f32) -&gt; Literal {
         <span class="macro">assert!</span>(f.is_finite());
         Literal::_new(imp::Literal::f32_suffixed(f))
     }

     <span class="doccomment">/// String literal.
     </span><span class="kw">pub fn </span>string(string: <span class="kw-2">&amp;</span>str) -&gt; Literal {
         Literal::_new(imp::Literal::string(string))
     }

     <span class="doccomment">/// Character literal.
     </span><span class="kw">pub fn </span>character(ch: char) -&gt; Literal {
         Literal::_new(imp::Literal::character(ch))
     }

     <span class="doccomment">/// Byte string literal.
     </span><span class="kw">pub fn </span>byte_string(s: <span class="kw-2">&amp;</span>[u8]) -&gt; Literal {
         Literal::_new(imp::Literal::byte_string(s))
     }

     <span class="doccomment">/// Returns the span encompassing this literal.
     </span><span class="kw">pub fn </span>span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         Span::_new(<span class="self">self</span>.inner.span())
     }

     <span class="doccomment">/// Configures the span associated for this literal.
     </span><span class="kw">pub fn </span>set_span(<span class="kw-2">&amp;mut </span><span class="self">self</span>, span: Span) {
         <span class="self">self</span>.inner.set_span(span.inner);
     }

     <span class="doccomment">/// Returns a `Span` that is a subset of `self.span()` containing only
     /// the source bytes in range `range`. Returns `None` if the would-be
     /// trimmed span is outside the bounds of `self`.
     ///
     /// Warning: the underlying [`proc_macro::Literal::subspan`] method is
     /// nightly-only. When called from within a procedural macro not using a
     /// nightly compiler, this method will always return `None`.
     ///
     /// [`proc_macro::Literal::subspan`]: https://doc.rust-lang.org/proc_macro/struct.Literal.html#method.subspan
     </span><span class="kw">pub fn </span>subspan&lt;R: RangeBounds&lt;usize&gt;&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, range: R) -&gt; <span class="prelude-ty">Option</span>&lt;Span&gt; {
         <span class="self">self</span>.inner.subspan(range).map(Span::_new)
     }

     <span class="comment">// Intended for the `quote!` macro to use when constructing a proc-macro2
     // token out of a macro_rules $:literal token, which is already known to be
     // a valid literal. This avoids reparsing/validating the literal&#39;s string
     // representation. This is not public API other than for quote.
     </span><span class="attribute">#[doc(hidden)]
     </span><span class="kw">pub unsafe fn </span>from_str_unchecked(repr: <span class="kw-2">&amp;</span>str) -&gt; <span class="self">Self </span>{
         Literal::_new(imp::Literal::from_str_unchecked(repr))
     }
 }

 <span class="kw">impl </span>FromStr <span class="kw">for </span>Literal {
     <span class="kw">type </span><span class="prelude-val">Err </span>= LexError;

     <span class="kw">fn </span>from_str(repr: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, LexError&gt; {
         repr.parse().map(Literal::_new).map_err(|inner| LexError {
             inner,
             _marker: Marker,
         })
     }
 }

 <span class="kw">impl </span>Debug <span class="kw">for </span>Literal {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Debug::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, f)
     }
 }

 <span class="kw">impl </span>Display <span class="kw">for </span>Literal {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         Display::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, f)
     }
 }

 <span class="doccomment">/// Public implementation details for the `TokenStream` type, such as iterators.
 </span><span class="kw">pub mod </span>token_stream {
     <span class="kw">use </span><span class="kw">crate</span>::marker::Marker;
     <span class="kw">use crate</span>::{imp, TokenTree};
     <span class="kw">use </span>core::fmt::{<span class="self">self</span>, Debug};

     <span class="kw">pub use </span><span class="kw">crate</span>::TokenStream;

     <span class="doccomment">/// An iterator over `TokenStream`&#39;s `TokenTree`s.
     ///
     /// The iteration is &quot;shallow&quot;, e.g. the iterator doesn&#39;t recurse into
     /// delimited groups, and returns whole groups as token trees.
     </span><span class="attribute">#[derive(Clone)]
     </span><span class="kw">pub struct </span>IntoIter {
         inner: imp::TokenTreeIter,
         _marker: Marker,
     }

     <span class="kw">impl </span>Iterator <span class="kw">for </span>IntoIter {
         <span class="kw">type </span>Item = TokenTree;

         <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;TokenTree&gt; {
             <span class="self">self</span>.inner.next()
         }

         <span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
             <span class="self">self</span>.inner.size_hint()
         }
     }

     <span class="kw">impl </span>Debug <span class="kw">for </span>IntoIter {
         <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
             f.write_str(<span class="string">&quot;TokenStream &quot;</span>)<span class="question-mark">?</span>;
             f.debug_list().entries(<span class="self">self</span>.clone()).finish()
         }
     }

     <span class="kw">impl </span>IntoIterator <span class="kw">for </span>TokenStream {
         <span class="kw">type </span>Item = TokenTree;
         <span class="kw">type </span>IntoIter = IntoIter;

         <span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; IntoIter {
             IntoIter {
                 inner: <span class="self">self</span>.inner.into_iter(),
                 _marker: Marker,
             }
         }
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="proc_macro2" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>