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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/fallback.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>fallback.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="attribute">#[cfg(span_locations)]
 </span><span class="kw">use </span><span class="kw">crate</span>::location::LineColumn;
 <span class="kw">use </span><span class="kw">crate</span>::parse::{<span class="self">self</span>, Cursor};
 <span class="kw">use </span><span class="kw">crate</span>::rcvec::{RcVec, RcVecBuilder, RcVecIntoIter, RcVecMut};
 <span class="kw">use crate</span>::{Delimiter, Spacing, TokenTree};
 <span class="attribute">#[cfg(all(span_locations, not(fuzzing)))]
 </span><span class="kw">use </span>core::cell::RefCell;
 <span class="attribute">#[cfg(span_locations)]
 </span><span class="kw">use </span>core::cmp;
 <span class="kw">use </span>core::fmt::{<span class="self">self</span>, Debug, Display, Write};
 <span class="kw">use </span>core::iter::FromIterator;
 <span class="kw">use </span>core::mem::ManuallyDrop;
 <span class="kw">use </span>core::ops::RangeBounds;
 <span class="kw">use </span>core::ptr;
 <span class="kw">use </span>core::str::FromStr;
 <span class="kw">use </span>std::path::PathBuf;

 <span class="doccomment">/// Force use of proc-macro2&#39;s fallback implementation of the API for now, even
 /// if the compiler&#39;s implementation is available.
 </span><span class="kw">pub fn </span>force() {
     <span class="attribute">#[cfg(wrap_proc_macro)]
     </span><span class="kw">crate</span>::detection::force_fallback();
 }

 <span class="doccomment">/// Resume using the compiler&#39;s implementation of the proc macro API if it is
 /// available.
 </span><span class="kw">pub fn </span>unforce() {
     <span class="attribute">#[cfg(wrap_proc_macro)]
     </span><span class="kw">crate</span>::detection::unforce_fallback();
 }

 <span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>TokenStream {
     inner: RcVec&lt;TokenTree&gt;,
 }

 <span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>LexError {
     <span class="kw">pub</span>(<span class="kw">crate</span>) span: Span,
 }

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

     <span class="kw">fn </span>call_site() -&gt; <span class="self">Self </span>{
         LexError {
             span: Span::call_site(),
         }
     }
 }

 <span class="kw">impl </span>TokenStream {
     <span class="kw">pub fn </span>new() -&gt; <span class="self">Self </span>{
         TokenStream {
             inner: RcVecBuilder::new().build(),
         }
     }

     <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.len() == <span class="number">0
     </span>}

     <span class="kw">fn </span>take_inner(<span class="self">self</span>) -&gt; RcVecBuilder&lt;TokenTree&gt; {
         <span class="kw">let </span>nodrop = ManuallyDrop::new(<span class="self">self</span>);
         <span class="kw">unsafe </span>{ ptr::read(<span class="kw-2">&amp;</span>nodrop.inner) }.make_owned()
     }
 }

 <span class="kw">fn </span>push_token_from_proc_macro(<span class="kw-2">mut </span>vec: RcVecMut&lt;TokenTree&gt;, token: TokenTree) {
     <span class="comment">// https://github.com/dtolnay/proc-macro2/issues/235
     </span><span class="kw">match </span>token {
         <span class="attribute">#[cfg(not(no_bind_by_move_pattern_guard))]
         </span>TokenTree::Literal(<span class="kw">crate</span>::Literal {
             <span class="attribute">#[cfg(wrap_proc_macro)]
                 </span>inner: <span class="kw">crate</span>::imp::Literal::Fallback(literal),
             <span class="attribute">#[cfg(not(wrap_proc_macro))]
                 </span>inner: literal,
             ..
         }) <span class="kw">if </span>literal.repr.starts_with(<span class="string">&#39;-&#39;</span>) =&gt; {
             push_negative_literal(vec, literal);
         }
         <span class="attribute">#[cfg(no_bind_by_move_pattern_guard)]
         </span>TokenTree::Literal(<span class="kw">crate</span>::Literal {
             <span class="attribute">#[cfg(wrap_proc_macro)]
                 </span>inner: <span class="kw">crate</span>::imp::Literal::Fallback(literal),
             <span class="attribute">#[cfg(not(wrap_proc_macro))]
                 </span>inner: literal,
             ..
         }) =&gt; {
             <span class="kw">if </span>literal.repr.starts_with(<span class="string">&#39;-&#39;</span>) {
                 push_negative_literal(vec, literal);
             } <span class="kw">else </span>{
                 vec.push(TokenTree::Literal(<span class="kw">crate</span>::Literal::_new_fallback(literal)));
             }
         }
         <span class="kw">_ </span>=&gt; vec.push(token),
     }

     <span class="attribute">#[cold]
     </span><span class="kw">fn </span>push_negative_literal(<span class="kw-2">mut </span>vec: RcVecMut&lt;TokenTree&gt;, <span class="kw-2">mut </span>literal: Literal) {
         literal.repr.remove(<span class="number">0</span>);
         <span class="kw">let </span><span class="kw-2">mut </span>punct = <span class="kw">crate</span>::Punct::new(<span class="string">&#39;-&#39;</span>, Spacing::Alone);
         punct.set_span(<span class="kw">crate</span>::Span::_new_fallback(literal.span));
         vec.push(TokenTree::Punct(punct));
         vec.push(TokenTree::Literal(<span class="kw">crate</span>::Literal::_new_fallback(literal)));
     }
 }

 <span class="comment">// Nonrecursive to prevent stack overflow.
 </span><span class="kw">impl </span>Drop <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="kw">match </span><span class="self">self</span>.inner.get_mut() {
             <span class="prelude-val">Some</span>(inner) =&gt; inner,
             <span class="prelude-val">None </span>=&gt; <span class="kw">return</span>,
         };
         <span class="kw">while let </span><span class="prelude-val">Some</span>(token) = inner.pop() {
             <span class="kw">let </span>group = <span class="kw">match </span>token {
                 TokenTree::Group(group) =&gt; group.inner,
                 <span class="kw">_ </span>=&gt; <span class="kw">continue</span>,
             };
             <span class="attribute">#[cfg(wrap_proc_macro)]
             </span><span class="kw">let </span>group = <span class="kw">match </span>group {
                 <span class="kw">crate</span>::imp::Group::Fallback(group) =&gt; group,
                 <span class="kw">crate</span>::imp::Group::Compiler(<span class="kw">_</span>) =&gt; <span class="kw">continue</span>,
             };
             inner.extend(group.stream.take_inner());
         }
     }
 }

 <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>TokenStreamBuilder {
     inner: RcVecBuilder&lt;TokenTree&gt;,
 }

 <span class="kw">impl </span>TokenStreamBuilder {
     <span class="kw">pub fn </span>new() -&gt; <span class="self">Self </span>{
         TokenStreamBuilder {
             inner: RcVecBuilder::new(),
         }
     }

     <span class="kw">pub fn </span>with_capacity(cap: usize) -&gt; <span class="self">Self </span>{
         TokenStreamBuilder {
             inner: RcVecBuilder::with_capacity(cap),
         }
     }

     <span class="kw">pub fn </span>push_token_from_parser(<span class="kw-2">&amp;mut </span><span class="self">self</span>, tt: TokenTree) {
         <span class="self">self</span>.inner.push(tt);
     }

     <span class="kw">pub fn </span>build(<span class="self">self</span>) -&gt; TokenStream {
         TokenStream {
             inner: <span class="self">self</span>.inner.build(),
         }
     }
 }

 <span class="attribute">#[cfg(span_locations)]
 </span><span class="kw">fn </span>get_cursor(src: <span class="kw-2">&amp;</span>str) -&gt; Cursor {
     <span class="attribute">#[cfg(fuzzing)]
     </span><span class="kw">return </span>Cursor { rest: src, off: <span class="number">1 </span>};

     <span class="comment">// Create a dummy file &amp; add it to the source map
     </span><span class="attribute">#[cfg(not(fuzzing))]
     </span>SOURCE_MAP.with(|cm| {
         <span class="kw">let </span><span class="kw-2">mut </span>cm = cm.borrow_mut();
         <span class="kw">let </span>span = cm.add_file(src);
         Cursor {
             rest: src,
             off: span.lo,
         }
     })
 }

 <span class="attribute">#[cfg(not(span_locations))]
 </span><span class="kw">fn </span>get_cursor(src: <span class="kw-2">&amp;</span>str) -&gt; Cursor {
     Cursor { rest: src }
 }

 <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="comment">// Create a dummy file &amp; add it to the source map
         </span><span class="kw">let </span><span class="kw-2">mut </span>cursor = get_cursor(src);

         <span class="comment">// Strip a byte order mark if present
         </span><span class="kw">const </span>BYTE_ORDER_MARK: <span class="kw-2">&amp;</span>str = <span class="string">&quot;\u{feff}&quot;</span>;
         <span class="kw">if </span>cursor.starts_with(BYTE_ORDER_MARK) {
             cursor = cursor.advance(BYTE_ORDER_MARK.len());
         }

         parse::token_stream(cursor)
     }
 }

 <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 {
         f.write_str(<span class="string">&quot;cannot parse string into token stream&quot;</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 {
         <span class="kw">let </span><span class="kw-2">mut </span>joint = <span class="bool-val">false</span>;
         <span class="kw">for </span>(i, tt) <span class="kw">in </span><span class="self">self</span>.inner.iter().enumerate() {
             <span class="kw">if </span>i != <span class="number">0 </span>&amp;&amp; !joint {
                 <span class="macro">write!</span>(f, <span class="string">&quot; &quot;</span>)<span class="question-mark">?</span>;
             }
             joint = <span class="bool-val">false</span>;
             <span class="kw">match </span>tt {
                 TokenTree::Group(tt) =&gt; Display::fmt(tt, f),
                 TokenTree::Ident(tt) =&gt; Display::fmt(tt, f),
                 TokenTree::Punct(tt) =&gt; {
                     joint = tt.spacing() == Spacing::Joint;
                     Display::fmt(tt, f)
                 }
                 TokenTree::Literal(tt) =&gt; Display::fmt(tt, f),
             }<span class="question-mark">?</span>;
         }

         <span class="prelude-val">Ok</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 {
         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="attribute">#[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>{
         inner
             .to_string()
             .parse()
             .expect(<span class="string">&quot;compiler token stream parse failed&quot;</span>)
     }
 }

 <span class="attribute">#[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
             .to_string()
             .parse()
             .expect(<span class="string">&quot;failed to parse to compiler tokens&quot;</span>)
     }
 }

 <span class="kw">impl </span>From&lt;TokenTree&gt; <span class="kw">for </span>TokenStream {
     <span class="kw">fn </span>from(tree: TokenTree) -&gt; <span class="self">Self </span>{
         <span class="kw">let </span><span class="kw-2">mut </span>stream = RcVecBuilder::new();
         push_token_from_proc_macro(stream.as_mut(), tree);
         TokenStream {
             inner: stream.build(),
         }
     }
 }

 <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;(tokens: I) -&gt; <span class="self">Self </span>{
         <span class="kw">let </span><span class="kw-2">mut </span>stream = TokenStream::new();
         stream.extend(tokens);
         stream
     }
 }

 <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>{
         <span class="kw">let </span><span class="kw-2">mut </span>v = RcVecBuilder::new();

         <span class="kw">for </span>stream <span class="kw">in </span>streams {
             v.extend(stream.take_inner());
         }

         TokenStream { inner: v.build() }
     }
 }

 <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>, tokens: I) {
         <span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="self">self</span>.inner.make_mut();
         tokens
             .into_iter()
             .for_each(|token| push_token_from_proc_macro(vec.as_mut(), token));
     }
 }

 <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.make_mut().extend(streams.into_iter().flatten());
     }
 }

 <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">type </span>TokenTreeIter = RcVecIntoIter&lt;TokenTree&gt;;

 <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 = TokenTreeIter;

     <span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; TokenTreeIter {
         <span class="self">self</span>.take_inner().into_iter()
     }
 }

 <span class="attribute">#[derive(Clone, PartialEq, Eq)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>SourceFile {
     path: PathBuf,
 }

 <span class="kw">impl </span>SourceFile {
     <span class="doccomment">/// Get the path to this source file as a string.
     </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>.path.clone()
     }

     <span class="kw">pub fn </span>is_real(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="comment">// XXX(nika): Support real files in the future?
         </span><span class="bool-val">false
     </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 {
         f.debug_struct(<span class="string">&quot;SourceFile&quot;</span>)
             .field(<span class="string">&quot;path&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.path())
             .field(<span class="string">&quot;is_real&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.is_real())
             .finish()
     }
 }

 <span class="attribute">#[cfg(all(span_locations, not(fuzzing)))]
 </span><span class="macro">thread_local! </span>{
     <span class="kw">static </span>SOURCE_MAP: RefCell&lt;SourceMap&gt; = RefCell::new(SourceMap {
         <span class="comment">// NOTE: We start with a single dummy file which all call_site() and
         // def_site() spans reference.
         </span>files: <span class="macro">vec!</span>[FileInfo {
             source_text: String::new(),
             span: Span { lo: <span class="number">0</span>, hi: <span class="number">0 </span>},
             lines: <span class="macro">vec!</span>[<span class="number">0</span>],
         }],
     });
 }

 <span class="attribute">#[cfg(all(span_locations, not(fuzzing)))]
 </span><span class="kw">struct </span>FileInfo {
     source_text: String,
     span: Span,
     lines: Vec&lt;usize&gt;,
 }

 <span class="attribute">#[cfg(all(span_locations, not(fuzzing)))]
 </span><span class="kw">impl </span>FileInfo {
     <span class="kw">fn </span>offset_line_column(<span class="kw-2">&amp;</span><span class="self">self</span>, offset: usize) -&gt; LineColumn {
         <span class="macro">assert!</span>(<span class="self">self</span>.span_within(Span {
             lo: offset <span class="kw">as </span>u32,
             hi: offset <span class="kw">as </span>u32
         }));
         <span class="kw">let </span>offset = offset - <span class="self">self</span>.span.lo <span class="kw">as </span>usize;
         <span class="kw">match </span><span class="self">self</span>.lines.binary_search(<span class="kw-2">&amp;</span>offset) {
             <span class="prelude-val">Ok</span>(found) =&gt; LineColumn {
                 line: found + <span class="number">1</span>,
                 column: <span class="number">0</span>,
             },
             <span class="prelude-val">Err</span>(idx) =&gt; LineColumn {
                 line: idx,
                 column: offset - <span class="self">self</span>.lines[idx - <span class="number">1</span>],
             },
         }
     }

     <span class="kw">fn </span>span_within(<span class="kw-2">&amp;</span><span class="self">self</span>, span: Span) -&gt; bool {
         span.lo &gt;= <span class="self">self</span>.span.lo &amp;&amp; span.hi &lt;= <span class="self">self</span>.span.hi
     }

     <span class="kw">fn </span>source_text(<span class="kw-2">&amp;</span><span class="self">self</span>, span: Span) -&gt; String {
         <span class="kw">let </span>lo = (span.lo - <span class="self">self</span>.span.lo) <span class="kw">as </span>usize;
         <span class="kw">let </span>hi = (span.hi - <span class="self">self</span>.span.lo) <span class="kw">as </span>usize;
         <span class="self">self</span>.source_text[lo..hi].to_owned()
     }
 }

 <span class="doccomment">/// Computes the offsets of each line in the given source string
 /// and the total number of characters
 </span><span class="attribute">#[cfg(all(span_locations, not(fuzzing)))]
 </span><span class="kw">fn </span>lines_offsets(s: <span class="kw-2">&amp;</span>str) -&gt; (usize, Vec&lt;usize&gt;) {
     <span class="kw">let </span><span class="kw-2">mut </span>lines = <span class="macro">vec!</span>[<span class="number">0</span>];
     <span class="kw">let </span><span class="kw-2">mut </span>total = <span class="number">0</span>;

     <span class="kw">for </span>ch <span class="kw">in </span>s.chars() {
         total += <span class="number">1</span>;
         <span class="kw">if </span>ch == <span class="string">&#39;\n&#39; </span>{
             lines.push(total);
         }
     }

     (total, lines)
 }

 <span class="attribute">#[cfg(all(span_locations, not(fuzzing)))]
 </span><span class="kw">struct </span>SourceMap {
     files: Vec&lt;FileInfo&gt;,
 }

 <span class="attribute">#[cfg(all(span_locations, not(fuzzing)))]
 </span><span class="kw">impl </span>SourceMap {
     <span class="kw">fn </span>next_start_pos(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; u32 {
         <span class="comment">// Add 1 so there&#39;s always space between files.
         //
         // We&#39;ll always have at least 1 file, as we initialize our files list
         // with a dummy file.
         </span><span class="self">self</span>.files.last().unwrap().span.hi + <span class="number">1
     </span>}

     <span class="kw">fn </span>add_file(<span class="kw-2">&amp;mut </span><span class="self">self</span>, src: <span class="kw-2">&amp;</span>str) -&gt; Span {
         <span class="kw">let </span>(len, lines) = lines_offsets(src);
         <span class="kw">let </span>lo = <span class="self">self</span>.next_start_pos();
         <span class="comment">// XXX(nika): Should we bother doing a checked cast or checked add here?
         </span><span class="kw">let </span>span = Span {
             lo,
             hi: lo + (len <span class="kw">as </span>u32),
         };

         <span class="self">self</span>.files.push(FileInfo {
             source_text: src.to_owned(),
             span,
             lines,
         });

         span
     }

     <span class="attribute">#[cfg(procmacro2_semver_exempt)]
     </span><span class="kw">fn </span>filepath(<span class="kw-2">&amp;</span><span class="self">self</span>, span: Span) -&gt; PathBuf {
         <span class="kw">for </span>(i, file) <span class="kw">in </span><span class="self">self</span>.files.iter().enumerate() {
             <span class="kw">if </span>file.span_within(span) {
                 <span class="kw">return </span>PathBuf::from(<span class="kw">if </span>i == <span class="number">0 </span>{
                     <span class="string">&quot;&lt;unspecified&gt;&quot;</span>.to_owned()
                 } <span class="kw">else </span>{
                     <span class="macro">format!</span>(<span class="string">&quot;&lt;parsed string {}&gt;&quot;</span>, i)
                 });
             }
         }
         <span class="macro">unreachable!</span>(<span class="string">&quot;Invalid span with no related FileInfo!&quot;</span>);
     }

     <span class="kw">fn </span>fileinfo(<span class="kw-2">&amp;</span><span class="self">self</span>, span: Span) -&gt; <span class="kw-2">&amp;</span>FileInfo {
         <span class="kw">for </span>file <span class="kw">in </span><span class="kw-2">&amp;</span><span class="self">self</span>.files {
             <span class="kw">if </span>file.span_within(span) {
                 <span class="kw">return </span>file;
             }
         }
         <span class="macro">unreachable!</span>(<span class="string">&quot;Invalid span with no related FileInfo!&quot;</span>);
     }
 }

 <span class="attribute">#[derive(Clone, Copy, PartialEq, Eq)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Span {
     <span class="attribute">#[cfg(span_locations)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) lo: u32,
     <span class="attribute">#[cfg(span_locations)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) hi: u32,
 }

 <span class="kw">impl </span>Span {
     <span class="attribute">#[cfg(not(span_locations))]
     </span><span class="kw">pub fn </span>call_site() -&gt; <span class="self">Self </span>{
         Span {}
     }

     <span class="attribute">#[cfg(span_locations)]
     </span><span class="kw">pub fn </span>call_site() -&gt; <span class="self">Self </span>{
         Span { lo: <span class="number">0</span>, hi: <span class="number">0 </span>}
     }

     <span class="attribute">#[cfg(not(no_hygiene))]
     </span><span class="kw">pub fn </span>mixed_site() -&gt; <span class="self">Self </span>{
         Span::call_site()
     }

     <span class="attribute">#[cfg(procmacro2_semver_exempt)]
     </span><span class="kw">pub fn </span>def_site() -&gt; <span class="self">Self </span>{
         Span::call_site()
     }

     <span class="kw">pub fn </span>resolved_at(<span class="kw-2">&amp;</span><span class="self">self</span>, _other: Span) -&gt; Span {
         <span class="comment">// Stable spans consist only of line/column information, so
         // `resolved_at` and `located_at` only select which span the
         // caller wants line/column information from.
         </span><span class="kw-2">*</span><span class="self">self
     </span>}

     <span class="kw">pub fn </span>located_at(<span class="kw-2">&amp;</span><span class="self">self</span>, other: Span) -&gt; Span {
         other
     }

     <span class="attribute">#[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 {
         <span class="attribute">#[cfg(fuzzing)]
         </span><span class="kw">return </span>SourceFile {
             path: PathBuf::from(<span class="string">&quot;&lt;unspecified&gt;&quot;</span>),
         };

         <span class="attribute">#[cfg(not(fuzzing))]
         </span>SOURCE_MAP.with(|cm| {
             <span class="kw">let </span>cm = cm.borrow();
             <span class="kw">let </span>path = cm.filepath(<span class="kw-2">*</span><span class="self">self</span>);
             SourceFile { path }
         })
     }

     <span class="attribute">#[cfg(span_locations)]
     </span><span class="kw">pub fn </span>start(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; LineColumn {
         <span class="attribute">#[cfg(fuzzing)]
         </span><span class="kw">return </span>LineColumn { line: <span class="number">0</span>, column: <span class="number">0 </span>};

         <span class="attribute">#[cfg(not(fuzzing))]
         </span>SOURCE_MAP.with(|cm| {
             <span class="kw">let </span>cm = cm.borrow();
             <span class="kw">let </span>fi = cm.fileinfo(<span class="kw-2">*</span><span class="self">self</span>);
             fi.offset_line_column(<span class="self">self</span>.lo <span class="kw">as </span>usize)
         })
     }

     <span class="attribute">#[cfg(span_locations)]
     </span><span class="kw">pub fn </span>end(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; LineColumn {
         <span class="attribute">#[cfg(fuzzing)]
         </span><span class="kw">return </span>LineColumn { line: <span class="number">0</span>, column: <span class="number">0 </span>};

         <span class="attribute">#[cfg(not(fuzzing))]
         </span>SOURCE_MAP.with(|cm| {
             <span class="kw">let </span>cm = cm.borrow();
             <span class="kw">let </span>fi = cm.fileinfo(<span class="kw-2">*</span><span class="self">self</span>);
             fi.offset_line_column(<span class="self">self</span>.hi <span class="kw">as </span>usize)
         })
     }

     <span class="attribute">#[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 {
             <span class="attribute">#[cfg(span_locations)]
             </span>lo: <span class="self">self</span>.lo,
             <span class="attribute">#[cfg(span_locations)]
             </span>hi: <span class="self">self</span>.lo,
         }
     }

     <span class="attribute">#[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 {
             <span class="attribute">#[cfg(span_locations)]
             </span>lo: <span class="self">self</span>.hi,
             <span class="attribute">#[cfg(span_locations)]
             </span>hi: <span class="self">self</span>.hi,
         }
     }

     <span class="attribute">#[cfg(not(span_locations))]
     </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="prelude-val">Some</span>(Span {})
     }

     <span class="attribute">#[cfg(span_locations)]
     </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="attribute">#[cfg(fuzzing)]
         </span><span class="kw">return </span>{
             <span class="kw">let _ </span>= other;
             <span class="prelude-val">None
         </span>};

         <span class="attribute">#[cfg(not(fuzzing))]
         </span>SOURCE_MAP.with(|cm| {
             <span class="kw">let </span>cm = cm.borrow();
             <span class="comment">// If `other` is not within the same FileInfo as us, return None.
             </span><span class="kw">if </span>!cm.fileinfo(<span class="kw-2">*</span><span class="self">self</span>).span_within(other) {
                 <span class="kw">return </span><span class="prelude-val">None</span>;
             }
             <span class="prelude-val">Some</span>(Span {
                 lo: cmp::min(<span class="self">self</span>.lo, other.lo),
                 hi: cmp::max(<span class="self">self</span>.hi, other.hi),
             })
         })
     }

     <span class="attribute">#[cfg(not(span_locations))]
     </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="prelude-val">None
     </span>}

     <span class="attribute">#[cfg(span_locations)]
     </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="attribute">#[cfg(fuzzing)]
         </span><span class="kw">return </span><span class="prelude-val">None</span>;

         <span class="attribute">#[cfg(not(fuzzing))]
         </span>{
             <span class="kw">if </span><span class="self">self</span>.is_call_site() {
                 <span class="prelude-val">None
             </span>} <span class="kw">else </span>{
                 <span class="prelude-val">Some</span>(SOURCE_MAP.with(|cm| cm.borrow().fileinfo(<span class="kw-2">*</span><span class="self">self</span>).source_text(<span class="kw-2">*</span><span class="self">self</span>)))
             }
         }
     }

     <span class="attribute">#[cfg(not(span_locations))]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>first_byte(<span class="self">self</span>) -&gt; <span class="self">Self </span>{
         <span class="self">self
     </span>}

     <span class="attribute">#[cfg(span_locations)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>first_byte(<span class="self">self</span>) -&gt; <span class="self">Self </span>{
         Span {
             lo: <span class="self">self</span>.lo,
             hi: cmp::min(<span class="self">self</span>.lo.saturating_add(<span class="number">1</span>), <span class="self">self</span>.hi),
         }
     }

     <span class="attribute">#[cfg(not(span_locations))]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>last_byte(<span class="self">self</span>) -&gt; <span class="self">Self </span>{
         <span class="self">self
     </span>}

     <span class="attribute">#[cfg(span_locations)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>last_byte(<span class="self">self</span>) -&gt; <span class="self">Self </span>{
         Span {
             lo: cmp::max(<span class="self">self</span>.hi.saturating_sub(<span class="number">1</span>), <span class="self">self</span>.lo),
             hi: <span class="self">self</span>.hi,
         }
     }

     <span class="attribute">#[cfg(span_locations)]
     </span><span class="kw">fn </span>is_call_site(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.lo == <span class="number">0 </span>&amp;&amp; <span class="self">self</span>.hi == <span class="number">0
     </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 {
         <span class="attribute">#[cfg(span_locations)]
         </span><span class="kw">return </span><span class="macro">write!</span>(f, <span class="string">&quot;bytes({}..{})&quot;</span>, <span class="self">self</span>.lo, <span class="self">self</span>.hi);

         <span class="attribute">#[cfg(not(span_locations))]
         </span><span class="macro">write!</span>(f, <span class="string">&quot;Span&quot;</span>)
     }
 }

 <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>debug_span_field_if_nontrivial(debug: <span class="kw-2">&amp;mut </span>fmt::DebugStruct, span: Span) {
     <span class="attribute">#[cfg(span_locations)]
     </span>{
         <span class="kw">if </span>span.is_call_site() {
             <span class="kw">return</span>;
         }
     }

     <span class="kw">if </span><span class="macro">cfg!</span>(span_locations) {
         debug.field(<span class="string">&quot;span&quot;</span>, <span class="kw-2">&amp;</span>span);
     }
 }

 <span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Group {
     delimiter: Delimiter,
     stream: TokenStream,
     span: Span,
 }

 <span class="kw">impl </span>Group {
     <span class="kw">pub fn </span>new(delimiter: Delimiter, stream: TokenStream) -&gt; <span class="self">Self </span>{
         Group {
             delimiter,
             stream,
             span: Span::call_site(),
         }
     }

     <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>.delimiter
     }

     <span class="kw">pub fn </span>stream(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
         <span class="self">self</span>.stream.clone()
     }

     <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="kw">pub fn </span>span_open(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         <span class="self">self</span>.span.first_byte()
     }

     <span class="kw">pub fn </span>span_close(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Span {
         <span class="self">self</span>.span.last_byte()
     }

     <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="kw">impl </span>Display <span class="kw">for </span>Group {
     <span class="comment">// We attempt to match libproc_macro&#39;s formatting.
     // Empty parens: ()
     // Nonempty parens: (...)
     // Empty brackets: []
     // Nonempty brackets: [...]
     // Empty braces: { }
     // Nonempty braces: { ... }
     </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 {
         <span class="kw">let </span>(open, close) = <span class="kw">match </span><span class="self">self</span>.delimiter {
             Delimiter::Parenthesis =&gt; (<span class="string">&quot;(&quot;</span>, <span class="string">&quot;)&quot;</span>),
             Delimiter::Brace =&gt; (<span class="string">&quot;{ &quot;</span>, <span class="string">&quot;}&quot;</span>),
             Delimiter::Bracket =&gt; (<span class="string">&quot;[&quot;</span>, <span class="string">&quot;]&quot;</span>),
             Delimiter::None =&gt; (<span class="string">&quot;&quot;</span>, <span class="string">&quot;&quot;</span>),
         };

         f.write_str(open)<span class="question-mark">?</span>;
         Display::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.stream, f)<span class="question-mark">?</span>;
         <span class="kw">if </span><span class="self">self</span>.delimiter == Delimiter::Brace &amp;&amp; !<span class="self">self</span>.stream.inner.is_empty() {
             f.write_str(<span class="string">&quot; &quot;</span>)<span class="question-mark">?</span>;
         }
         f.write_str(close)<span class="question-mark">?</span>;

         <span class="prelude-val">Ok</span>(())
     }
 }

 <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>, 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;Group&quot;</span>);
         debug.field(<span class="string">&quot;delimiter&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.delimiter);
         debug.field(<span class="string">&quot;stream&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.stream);
         debug_span_field_if_nontrivial(<span class="kw-2">&amp;mut </span>debug, <span class="self">self</span>.span);
         debug.finish()
     }
 }

 <span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Ident {
     sym: String,
     span: Span,
     raw: bool,
 }

 <span class="kw">impl </span>Ident {
     <span class="kw">fn </span>_new(string: <span class="kw-2">&amp;</span>str, raw: bool, span: Span) -&gt; <span class="self">Self </span>{
         validate_ident(string, raw);

         Ident {
             sym: string.to_owned(),
             span,
             raw,
         }
     }

     <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(string, <span class="bool-val">false</span>, 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(string, <span class="bool-val">true</span>, 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="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="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_ident_start(c: char) -&gt; bool {
     c == <span class="string">&#39;_&#39; </span>|| unicode_ident::is_xid_start(c)
 }

 <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_ident_continue(c: char) -&gt; bool {
     unicode_ident::is_xid_continue(c)
 }

 <span class="kw">fn </span>validate_ident(string: <span class="kw-2">&amp;</span>str, raw: bool) {
     <span class="kw">if </span>string.is_empty() {
         <span class="macro">panic!</span>(<span class="string">&quot;Ident is not allowed to be empty; use Option&lt;Ident&gt;&quot;</span>);
     }

     <span class="kw">if </span>string.bytes().all(|digit| digit &gt;= <span class="string">b&#39;0&#39; </span>&amp;&amp; digit &lt;= <span class="string">b&#39;9&#39;</span>) {
         <span class="macro">panic!</span>(<span class="string">&quot;Ident cannot be a number; use Literal instead&quot;</span>);
     }

     <span class="kw">fn </span>ident_ok(string: <span class="kw-2">&amp;</span>str) -&gt; bool {
         <span class="kw">let </span><span class="kw-2">mut </span>chars = string.chars();
         <span class="kw">let </span>first = chars.next().unwrap();
         <span class="kw">if </span>!is_ident_start(first) {
             <span class="kw">return </span><span class="bool-val">false</span>;
         }
         <span class="kw">for </span>ch <span class="kw">in </span>chars {
             <span class="kw">if </span>!is_ident_continue(ch) {
                 <span class="kw">return </span><span class="bool-val">false</span>;
             }
         }
         <span class="bool-val">true
     </span>}

     <span class="kw">if </span>!ident_ok(string) {
         <span class="macro">panic!</span>(<span class="string">&quot;{:?} is not a valid Ident&quot;</span>, string);
     }

     <span class="kw">if </span>raw {
         <span class="kw">match </span>string {
             <span class="string">&quot;_&quot; </span>| <span class="string">&quot;super&quot; </span>| <span class="string">&quot;self&quot; </span>| <span class="string">&quot;Self&quot; </span>| <span class="string">&quot;crate&quot; </span>=&gt; {
                 <span class="macro">panic!</span>(<span class="string">&quot;`r#{}` cannot be a raw identifier&quot;</span>, string);
             }
             <span class="kw">_ </span>=&gt; {}
         }
     }
 }

 <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>.sym == other.sym &amp;&amp; <span class="self">self</span>.raw == other.raw
     }
 }

 <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="kw">let </span>other = other.as_ref();
         <span class="kw">if </span><span class="self">self</span>.raw {
             other.starts_with(<span class="string">&quot;r#&quot;</span>) &amp;&amp; <span class="self">self</span>.sym == other[<span class="number">2</span>..]
         } <span class="kw">else </span>{
             <span class="self">self</span>.sym == other
         }
     }
 }

 <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 {
         <span class="kw">if </span><span class="self">self</span>.raw {
             f.write_str(<span class="string">&quot;r#&quot;</span>)<span class="question-mark">?</span>;
         }
         Display::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.sym, f)
     }
 }

 <span class="kw">impl </span>Debug <span class="kw">for </span>Ident {
     <span class="comment">// Ident(proc_macro), Ident(r#union)
     </span><span class="attribute">#[cfg(not(span_locations))]
     </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 {
         <span class="kw">let </span><span class="kw-2">mut </span>debug = f.debug_tuple(<span class="string">&quot;Ident&quot;</span>);
         debug.field(<span class="kw-2">&amp;</span><span class="macro">format_args!</span>(<span class="string">&quot;{}&quot;</span>, <span class="self">self</span>));
         debug.finish()
     }

     <span class="comment">// Ident {
     //     sym: proc_macro,
     //     span: bytes(128..138)
     // }
     </span><span class="attribute">#[cfg(span_locations)]
     </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 {
         <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>, <span class="self">self</span>));
         debug_span_field_if_nontrivial(<span class="kw-2">&amp;mut </span>debug, <span class="self">self</span>.span);
         debug.finish()
     }
 }

 <span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Literal {
     repr: String,
     span: Span,
 }

 <span class="macro">macro_rules! </span>suffixed_numbers {
     ($(<span class="macro-nonterminal">$name</span>:ident =&gt; <span class="macro-nonterminal">$kind</span>:ident,)<span class="kw-2">*</span>) =&gt; ($(
         <span class="kw">pub fn </span><span class="macro-nonterminal">$name</span>(n: <span class="macro-nonterminal">$kind</span>) -&gt; Literal {
             Literal::_new(<span class="macro">format!</span>(<span class="macro">concat!</span>(<span class="string">&quot;{}&quot;</span>, <span class="macro">stringify!</span>(<span class="macro-nonterminal">$kind</span>)), n))
         }
     )<span class="kw-2">*</span>)
 }

 <span class="macro">macro_rules! </span>unsuffixed_numbers {
     ($(<span class="macro-nonterminal">$name</span>:ident =&gt; <span class="macro-nonterminal">$kind</span>:ident,)<span class="kw-2">*</span>) =&gt; ($(
         <span class="kw">pub fn </span><span class="macro-nonterminal">$name</span>(n: <span class="macro-nonterminal">$kind</span>) -&gt; Literal {
             Literal::_new(n.to_string())
         }
     )<span class="kw-2">*</span>)
 }

 <span class="kw">impl </span>Literal {
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>_new(repr: String) -&gt; <span class="self">Self </span>{
         Literal {
             repr,
             span: Span::call_site(),
         }
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">unsafe fn </span>from_str_unchecked(repr: <span class="kw-2">&amp;</span>str) -&gt; <span class="self">Self </span>{
         Literal::_new(repr.to_owned())
     }

     <span class="macro">suffixed_numbers! </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,

         f32_suffixed =&gt; f32,
         f64_suffixed =&gt; f64,
     }

     <span class="macro">unsuffixed_numbers! </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="kw">pub fn </span>f32_unsuffixed(f: f32) -&gt; Literal {
         <span class="kw">let </span><span class="kw-2">mut </span>s = f.to_string();
         <span class="kw">if </span>!s.contains(<span class="string">&#39;.&#39;</span>) {
             s.push_str(<span class="string">&quot;.0&quot;</span>);
         }
         Literal::_new(s)
     }

     <span class="kw">pub fn </span>f64_unsuffixed(f: f64) -&gt; Literal {
         <span class="kw">let </span><span class="kw-2">mut </span>s = f.to_string();
         <span class="kw">if </span>!s.contains(<span class="string">&#39;.&#39;</span>) {
             s.push_str(<span class="string">&quot;.0&quot;</span>);
         }
         Literal::_new(s)
     }

     <span class="kw">pub fn </span>string(t: <span class="kw-2">&amp;</span>str) -&gt; Literal {
         <span class="kw">let </span><span class="kw-2">mut </span>repr = String::with_capacity(t.len() + <span class="number">2</span>);
         repr.push(<span class="string">&#39;&quot;&#39;</span>);
         <span class="kw">let </span><span class="kw-2">mut </span>chars = t.chars();
         <span class="kw">while let </span><span class="prelude-val">Some</span>(ch) = chars.next() {
             <span class="kw">if </span>ch == <span class="string">&#39;\0&#39; </span>{
                 repr.push_str(
                     <span class="kw">if </span>chars
                         .as_str()
                         .starts_with(|next| <span class="string">&#39;0&#39; </span>&lt;= next &amp;&amp; next &lt;= <span class="string">&#39;7&#39;</span>)
                     {
                         <span class="comment">// circumvent clippy::octal_escapes lint
                         </span><span class="string">&quot;\\x00&quot;
                     </span>} <span class="kw">else </span>{
                         <span class="string">&quot;\\0&quot;
                     </span>},
                 );
             } <span class="kw">else if </span>ch == <span class="string">&#39;\&#39;&#39; </span>{
                 <span class="comment">// escape_debug turns this into &quot;\&#39;&quot; which is unnecessary.
                 </span>repr.push(ch);
             } <span class="kw">else </span>{
                 repr.extend(ch.escape_debug());
             }
         }
         repr.push(<span class="string">&#39;&quot;&#39;</span>);
         Literal::_new(repr)
     }

     <span class="kw">pub fn </span>character(t: char) -&gt; Literal {
         <span class="kw">let </span><span class="kw-2">mut </span>repr = String::new();
         repr.push(<span class="string">&#39;\&#39;&#39;</span>);
         <span class="kw">if </span>t == <span class="string">&#39;&quot;&#39; </span>{
             <span class="comment">// escape_debug turns this into &#39;\&quot;&#39; which is unnecessary.
             </span>repr.push(t);
         } <span class="kw">else </span>{
             repr.extend(t.escape_debug());
         }
         repr.push(<span class="string">&#39;\&#39;&#39;</span>);
         Literal::_new(repr)
     }

     <span class="kw">pub fn </span>byte_string(bytes: <span class="kw-2">&amp;</span>[u8]) -&gt; Literal {
         <span class="kw">let </span><span class="kw-2">mut </span>escaped = <span class="string">&quot;b\&quot;&quot;</span>.to_string();
         <span class="kw">let </span><span class="kw-2">mut </span>bytes = bytes.iter();
         <span class="kw">while let </span><span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>b) = bytes.next() {
             <span class="attribute">#[allow(clippy::match_overlapping_arm)]
             </span><span class="kw">match </span>b {
                 <span class="string">b&#39;\0&#39; </span>=&gt; escaped.push_str(<span class="kw">match </span>bytes.as_slice().first() {
                     <span class="comment">// circumvent clippy::octal_escapes lint
                     </span><span class="prelude-val">Some</span>(<span class="string">b&#39;0&#39;</span>..=<span class="string">b&#39;7&#39;</span>) =&gt; <span class="string">r&quot;\x00&quot;</span>,
                     <span class="kw">_ </span>=&gt; <span class="string">r&quot;\0&quot;</span>,
                 }),
                 <span class="string">b&#39;\t&#39; </span>=&gt; escaped.push_str(<span class="string">r&quot;\t&quot;</span>),
                 <span class="string">b&#39;\n&#39; </span>=&gt; escaped.push_str(<span class="string">r&quot;\n&quot;</span>),
                 <span class="string">b&#39;\r&#39; </span>=&gt; escaped.push_str(<span class="string">r&quot;\r&quot;</span>),
                 <span class="string">b&#39;&quot;&#39; </span>=&gt; escaped.push_str(<span class="string">&quot;\\\&quot;&quot;</span>),
                 <span class="string">b&#39;\\&#39; </span>=&gt; escaped.push_str(<span class="string">&quot;\\\\&quot;</span>),
                 <span class="string">b&#39;\x20&#39;</span>..=<span class="string">b&#39;\x7E&#39; </span>=&gt; escaped.push(b <span class="kw">as </span>char),
                 <span class="kw">_ </span>=&gt; {
                     <span class="kw">let _ </span>= <span class="macro">write!</span>(escaped, <span class="string">&quot;\\x{:02X}&quot;</span>, b);
                 }
             }
         }
         escaped.push(<span class="string">&#39;&quot;&#39;</span>);
         Literal::_new(escaped)
     }

     <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="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="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="attribute">#[cfg(not(span_locations))]
         </span>{
             <span class="kw">let _ </span>= range;
             <span class="prelude-val">None
         </span>}

         <span class="attribute">#[cfg(span_locations)]
         </span>{
             <span class="kw">use </span><span class="kw">crate</span>::convert::usize_to_u32;
             <span class="kw">use </span>core::ops::Bound;

             <span class="kw">let </span>lo = <span class="kw">match </span>range.start_bound() {
                 Bound::Included(start) =&gt; {
                     <span class="kw">let </span>start = usize_to_u32(<span class="kw-2">*</span>start)<span class="question-mark">?</span>;
                     <span class="self">self</span>.span.lo.checked_add(start)<span class="question-mark">?
                 </span>}
                 Bound::Excluded(start) =&gt; {
                     <span class="kw">let </span>start = usize_to_u32(<span class="kw-2">*</span>start)<span class="question-mark">?</span>;
                     <span class="self">self</span>.span.lo.checked_add(start)<span class="question-mark">?</span>.checked_add(<span class="number">1</span>)<span class="question-mark">?
                 </span>}
                 Bound::Unbounded =&gt; <span class="self">self</span>.span.lo,
             };
             <span class="kw">let </span>hi = <span class="kw">match </span>range.end_bound() {
                 Bound::Included(end) =&gt; {
                     <span class="kw">let </span>end = usize_to_u32(<span class="kw-2">*</span>end)<span class="question-mark">?</span>;
                     <span class="self">self</span>.span.lo.checked_add(end)<span class="question-mark">?</span>.checked_add(<span class="number">1</span>)<span class="question-mark">?
                 </span>}
                 Bound::Excluded(end) =&gt; {
                     <span class="kw">let </span>end = usize_to_u32(<span class="kw-2">*</span>end)<span class="question-mark">?</span>;
                     <span class="self">self</span>.span.lo.checked_add(end)<span class="question-mark">?
                 </span>}
                 Bound::Unbounded =&gt; <span class="self">self</span>.span.hi,
             };
             <span class="kw">if </span>lo &lt;= hi &amp;&amp; hi &lt;= <span class="self">self</span>.span.hi {
                 <span class="prelude-val">Some</span>(Span { lo, hi })
             } <span class="kw">else </span>{
                 <span class="prelude-val">None
             </span>}
         }
     }
 }

 <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>, <span class="self">Self</span>::Err&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>cursor = get_cursor(repr);
         <span class="attribute">#[cfg(span_locations)]
         </span><span class="kw">let </span>lo = cursor.off;

         <span class="kw">let </span>negative = cursor.starts_with_char(<span class="string">&#39;-&#39;</span>);
         <span class="kw">if </span>negative {
             cursor = cursor.advance(<span class="number">1</span>);
             <span class="kw">if </span>!cursor.starts_with_fn(|ch| ch.is_ascii_digit()) {
                 <span class="kw">return </span><span class="prelude-val">Err</span>(LexError::call_site());
             }
         }

         <span class="kw">if let </span><span class="prelude-val">Ok</span>((rest, <span class="kw-2">mut </span>literal)) = parse::literal(cursor) {
             <span class="kw">if </span>rest.is_empty() {
                 <span class="kw">if </span>negative {
                     literal.repr.insert(<span class="number">0</span>, <span class="string">&#39;-&#39;</span>);
                 }
                 literal.span = Span {
                     <span class="attribute">#[cfg(span_locations)]
                     </span>lo,
                     <span class="attribute">#[cfg(span_locations)]
                     </span>hi: rest.off,
                 };
                 <span class="kw">return </span><span class="prelude-val">Ok</span>(literal);
             }
         }
         <span class="prelude-val">Err</span>(LexError::call_site())
     }
 }

 <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>.repr, f)
     }
 }

 <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>, 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;Literal&quot;</span>);
         debug.field(<span class="string">&quot;lit&quot;</span>, <span class="kw-2">&amp;</span><span class="macro">format_args!</span>(<span class="string">&quot;{}&quot;</span>, <span class="self">self</span>.repr));
         debug_span_field_if_nontrivial(<span class="kw-2">&amp;mut </span>debug, <span class="self">self</span>.span);
         debug.finish()
     }
 }
 </code></pre></div>
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