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class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">proc_macro2/</div>wrapper.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"> <a href="#1" id="1">1</a> <a href="#2" id="2">2</a> <a href="#3" id="3">3</a> <a href="#4" id="4">4</a> <a href="#5" id="5">5</a> <a href="#6" id="6">6</a> <a href="#7" id="7">7</a> <a href="#8" id="8">8</a> <a href="#9" id="9">9</a> <a href="#10" id="10">10</a> <a href="#11" id="11">11</a> <a href="#12" id="12">12</a> <a href="#13" id="13">13</a> <a href="#14" id="14">14</a> <a href="#15" id="15">15</a> <a href="#16" id="16">16</a> <a href="#17" id="17">17</a> <a href="#18" id="18">18</a> <a href="#19" id="19">19</a> <a href="#20" id="20">20</a> <a href="#21" id="21">21</a> <a href="#22" id="22">22</a> <a href="#23" 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id="930">930</a> <a href="#931" id="931">931</a> <a href="#932" id="932">932</a> <a href="#933" id="933">933</a> <a href="#934" id="934">934</a> <a href="#935" id="935">935</a> <a href="#936" id="936">936</a> <a href="#937" id="937">937</a> <a href="#938" id="938">938</a> <a href="#939" id="939">939</a> <a href="#940" id="940">940</a> <a href="#941" id="941">941</a> <a href="#942" id="942">942</a> <a href="#943" id="943">943</a> <a href="#944" id="944">944</a> <a href="#945" id="945">945</a> <a href="#946" id="946">946</a> <a href="#947" id="947">947</a> <a href="#948" id="948">948</a> <a href="#949" id="949">949</a> <a href="#950" id="950">950</a> <a href="#951" id="951">951</a> <a href="#952" id="952">952</a> <a href="#953" id="953">953</a> <a href="#954" id="954">954</a> <a href="#955" id="955">955</a> <a href="#956" id="956">956</a> <a href="#957" id="957">957</a> <a href="#958" id="958">958</a> <a href="#959" id="959">959</a> <a href="#960" id="960">960</a> <a href="#961" id="961">961</a> <a href="#962" id="962">962</a> <a href="#963" id="963">963</a> <a href="#964" id="964">964</a> <a href="#965" id="965">965</a> <a href="#966" id="966">966</a> <a href="#967" id="967">967</a> <a href="#968" id="968">968</a> <a href="#969" id="969">969</a> <a href="#970" id="970">970</a> <a href="#971" id="971">971</a> <a href="#972" id="972">972</a> <a href="#973" id="973">973</a> <a href="#974" id="974">974</a> <a href="#975" id="975">975</a> <a href="#976" id="976">976</a> <a href="#977" id="977">977</a> <a href="#978" id="978">978</a> <a href="#979" id="979">979</a> <a href="#980" id="980">980</a> <a href="#981" id="981">981</a> <a href="#982" id="982">982</a> <a href="#983" id="983">983</a> <a href="#984" id="984">984</a> <a href="#985" id="985">985</a> <a href="#986" id="986">986</a> <a href="#987" id="987">987</a> <a href="#988" id="988">988</a> <a href="#989" id="989">989</a> <a href="#990" id="990">990</a> <a href="#991" id="991">991</a> <a href="#992" id="992">992</a> <a href="#993" id="993">993</a> <a href="#994" id="994">994</a> <a href="#995" id="995">995</a> <a href="#996" id="996">996</a> <a href="#997" id="997">997</a> <a href="#998" id="998">998</a> <a href="#999" id="999">999</a> <a href="#1000" id="1000">1000</a> <a href="#1001" id="1001">1001</a> <a href="#1002" id="1002">1002</a> <a href="#1003" id="1003">1003</a></pre></div><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::detection::inside_proc_macro; <span class="kw">use </span><span class="kw">crate</span>::fallback::{<span class="self">self</span>, FromStr2 <span class="kw">as _</span>}; <span class="attr">#[cfg(span_locations)] </span><span class="kw">use </span><span class="kw">crate</span>::location::LineColumn; <span class="kw">use crate</span>::{Delimiter, Punct, Spacing, TokenTree}; <span class="kw">use </span>core::fmt::{<span class="self">self</span>, Debug, Display}; <span class="attr">#[cfg(span_locations)] </span><span class="kw">use </span>core::ops::Range; <span class="kw">use </span>core::ops::RangeBounds; <span class="kw">use </span>std::ffi::CStr; <span class="attr">#[cfg(super_unstable)] </span><span class="kw">use </span>std::path::PathBuf; <span class="attr">#[derive(Clone)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>TokenStream { Compiler(DeferredTokenStream), Fallback(fallback::TokenStream), } <span class="comment">// Work around https://github.com/rust-lang/rust/issues/65080. // In `impl Extend<TokenTree> for TokenStream` which is used heavily by quote, // we hold on to the appended tokens and do proc_macro::TokenStream::extend as // late as possible to batch together consecutive uses of the Extend impl. </span><span class="attr">#[derive(Clone)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>DeferredTokenStream { stream: proc_macro::TokenStream, extra: Vec<proc_macro::TokenTree>, } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>LexError { Compiler(proc_macro::LexError), Fallback(fallback::LexError), <span class="comment">// Rustc was supposed to return a LexError, but it panicked instead. // https://github.com/rust-lang/rust/issues/58736 </span>CompilerPanic, } <span class="attr">#[cold] </span><span class="kw">fn </span>mismatch(line: u32) -> ! { <span class="attr">#[cfg(procmacro2_backtrace)] </span>{ <span class="kw">let </span>backtrace = std::backtrace::Backtrace::force_capture(); <span class="macro">panic!</span>(<span class="string">"compiler/fallback mismatch L{}\n\n{}"</span>, line, backtrace) } <span class="attr">#[cfg(not(procmacro2_backtrace))] </span>{ <span class="macro">panic!</span>(<span class="string">"compiler/fallback mismatch L{}"</span>, line) } } <span class="kw">impl </span>DeferredTokenStream { <span class="kw">fn </span>new(stream: proc_macro::TokenStream) -> <span class="self">Self </span>{ DeferredTokenStream { stream, extra: Vec::new(), } } <span class="kw">fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="self">self</span>.stream.is_empty() && <span class="self">self</span>.extra.is_empty() } <span class="kw">fn </span>evaluate_now(<span class="kw-2">&mut </span><span class="self">self</span>) { <span class="comment">// If-check provides a fast short circuit for the common case of `extra` // being empty, which saves a round trip over the proc macro bridge. // Improves macro expansion time in winrt by 6% in debug mode. </span><span class="kw">if </span>!<span class="self">self</span>.extra.is_empty() { <span class="self">self</span>.stream.extend(<span class="self">self</span>.extra.drain(..)); } } <span class="kw">fn </span>into_token_stream(<span class="kw-2">mut </span><span class="self">self</span>) -> proc_macro::TokenStream { <span class="self">self</span>.evaluate_now(); <span class="self">self</span>.stream } } <span class="kw">impl </span>TokenStream { <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new() -> <span class="self">Self </span>{ <span class="kw">if </span>inside_proc_macro() { TokenStream::Compiler(DeferredTokenStream::new(proc_macro::TokenStream::new())) } <span class="kw">else </span>{ TokenStream::Fallback(fallback::TokenStream::new()) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>from_str_checked(src: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, LexError> { <span class="kw">if </span>inside_proc_macro() { <span class="prelude-val">Ok</span>(TokenStream::Compiler(DeferredTokenStream::new( proc_macro::TokenStream::from_str_checked(src)<span class="question-mark">?</span>, ))) } <span class="kw">else </span>{ <span class="prelude-val">Ok</span>(TokenStream::Fallback( fallback::TokenStream::from_str_checked(src)<span class="question-mark">?</span>, )) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="kw">match </span><span class="self">self </span>{ TokenStream::Compiler(tts) => tts.is_empty(), TokenStream::Fallback(tts) => tts.is_empty(), } } <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -> proc_macro::TokenStream { <span class="kw">match </span><span class="self">self </span>{ TokenStream::Compiler(s) => s.into_token_stream(), TokenStream::Fallback(<span class="kw">_</span>) => mismatch(<span class="macro">line!</span>()), } } <span class="kw">fn </span>unwrap_stable(<span class="self">self</span>) -> fallback::TokenStream { <span class="kw">match </span><span class="self">self </span>{ TokenStream::Compiler(<span class="kw">_</span>) => mismatch(<span class="macro">line!</span>()), TokenStream::Fallback(s) => s, } } } <span class="kw">impl </span>Display <span class="kw">for </span>TokenStream { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ TokenStream::Compiler(tts) => Display::fmt(<span class="kw-2">&</span>tts.clone().into_token_stream(), f), TokenStream::Fallback(tts) => Display::fmt(tts, f), } } } <span class="kw">impl </span>From<proc_macro::TokenStream> <span class="kw">for </span>TokenStream { <span class="kw">fn </span>from(inner: proc_macro::TokenStream) -> <span class="self">Self </span>{ TokenStream::Compiler(DeferredTokenStream::new(inner)) } } <span class="kw">impl </span>From<TokenStream> <span class="kw">for </span>proc_macro::TokenStream { <span class="kw">fn </span>from(inner: TokenStream) -> <span class="self">Self </span>{ <span class="kw">match </span>inner { TokenStream::Compiler(inner) => inner.into_token_stream(), TokenStream::Fallback(inner) => { proc_macro::TokenStream::from_str_unchecked(<span class="kw-2">&</span>inner.to_string()) } } } } <span class="kw">impl </span>From<fallback::TokenStream> <span class="kw">for </span>TokenStream { <span class="kw">fn </span>from(inner: fallback::TokenStream) -> <span class="self">Self </span>{ TokenStream::Fallback(inner) } } <span class="comment">// Assumes inside_proc_macro(). </span><span class="kw">fn </span>into_compiler_token(token: TokenTree) -> proc_macro::TokenTree { <span class="kw">match </span>token { TokenTree::Group(tt) => proc_macro::TokenTree::Group(tt.inner.unwrap_nightly()), TokenTree::Punct(tt) => { <span class="kw">let </span>spacing = <span class="kw">match </span>tt.spacing() { Spacing::Joint => proc_macro::Spacing::Joint, Spacing::Alone => proc_macro::Spacing::Alone, }; <span class="kw">let </span><span class="kw-2">mut </span>punct = proc_macro::Punct::new(tt.as_char(), spacing); punct.set_span(tt.span().inner.unwrap_nightly()); proc_macro::TokenTree::Punct(punct) } TokenTree::Ident(tt) => proc_macro::TokenTree::Ident(tt.inner.unwrap_nightly()), TokenTree::Literal(tt) => proc_macro::TokenTree::Literal(tt.inner.unwrap_nightly()), } } <span class="kw">impl </span>From<TokenTree> <span class="kw">for </span>TokenStream { <span class="kw">fn </span>from(token: TokenTree) -> <span class="self">Self </span>{ <span class="kw">if </span>inside_proc_macro() { TokenStream::Compiler(DeferredTokenStream::new(proc_macro::TokenStream::from( into_compiler_token(token), ))) } <span class="kw">else </span>{ TokenStream::Fallback(fallback::TokenStream::from(token)) } } } <span class="kw">impl </span>FromIterator<TokenTree> <span class="kw">for </span>TokenStream { <span class="kw">fn </span>from_iter<I: IntoIterator<Item = TokenTree>>(trees: I) -> <span class="self">Self </span>{ <span class="kw">if </span>inside_proc_macro() { TokenStream::Compiler(DeferredTokenStream::new( trees.into_iter().map(into_compiler_token).collect(), )) } <span class="kw">else </span>{ TokenStream::Fallback(trees.into_iter().collect()) } } } <span class="kw">impl </span>FromIterator<TokenStream> <span class="kw">for </span>TokenStream { <span class="kw">fn </span>from_iter<I: IntoIterator<Item = TokenStream>>(streams: I) -> <span class="self">Self </span>{ <span class="kw">let </span><span class="kw-2">mut </span>streams = streams.into_iter(); <span class="kw">match </span>streams.next() { <span class="prelude-val">Some</span>(TokenStream::Compiler(<span class="kw-2">mut </span>first)) => { first.evaluate_now(); first.stream.extend(streams.map(|s| <span class="kw">match </span>s { TokenStream::Compiler(s) => s.into_token_stream(), TokenStream::Fallback(<span class="kw">_</span>) => mismatch(<span class="macro">line!</span>()), })); TokenStream::Compiler(first) } <span class="prelude-val">Some</span>(TokenStream::Fallback(<span class="kw-2">mut </span>first)) => { first.extend(streams.map(|s| <span class="kw">match </span>s { TokenStream::Fallback(s) => s, TokenStream::Compiler(<span class="kw">_</span>) => mismatch(<span class="macro">line!</span>()), })); TokenStream::Fallback(first) } <span class="prelude-val">None </span>=> TokenStream::new(), } } } <span class="kw">impl </span>Extend<TokenTree> <span class="kw">for </span>TokenStream { <span class="kw">fn </span>extend<I: IntoIterator<Item = TokenTree>>(<span class="kw-2">&mut </span><span class="self">self</span>, stream: I) { <span class="kw">match </span><span class="self">self </span>{ TokenStream::Compiler(tts) => { <span class="comment">// Here is the reason for DeferredTokenStream. </span><span class="kw">for </span>token <span class="kw">in </span>stream { tts.extra.push(into_compiler_token(token)); } } TokenStream::Fallback(tts) => tts.extend(stream), } } } <span class="kw">impl </span>Extend<TokenStream> <span class="kw">for </span>TokenStream { <span class="kw">fn </span>extend<I: IntoIterator<Item = TokenStream>>(<span class="kw-2">&mut </span><span class="self">self</span>, streams: I) { <span class="kw">match </span><span class="self">self </span>{ TokenStream::Compiler(tts) => { tts.evaluate_now(); tts.stream .extend(streams.into_iter().map(TokenStream::unwrap_nightly)); } TokenStream::Fallback(tts) => { tts.extend(streams.into_iter().map(TokenStream::unwrap_stable)); } } } } <span class="kw">impl </span>Debug <span class="kw">for </span>TokenStream { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ TokenStream::Compiler(tts) => Debug::fmt(<span class="kw-2">&</span>tts.clone().into_token_stream(), f), TokenStream::Fallback(tts) => Debug::fmt(tts, f), } } } <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">&</span><span class="self">self</span>) -> Span { <span class="kw">match </span><span class="self">self </span>{ LexError::Compiler(<span class="kw">_</span>) | LexError::CompilerPanic => Span::call_site(), LexError::Fallback(e) => Span::Fallback(e.span()), } } } <span class="kw">impl </span>From<proc_macro::LexError> <span class="kw">for </span>LexError { <span class="kw">fn </span>from(e: proc_macro::LexError) -> <span class="self">Self </span>{ LexError::Compiler(e) } } <span class="kw">impl </span>From<fallback::LexError> <span class="kw">for </span>LexError { <span class="kw">fn </span>from(e: fallback::LexError) -> <span class="self">Self </span>{ LexError::Fallback(e) } } <span class="kw">impl </span>Debug <span class="kw">for </span>LexError { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ LexError::Compiler(e) => Debug::fmt(e, f), LexError::Fallback(e) => Debug::fmt(e, f), LexError::CompilerPanic => { <span class="kw">let </span>fallback = fallback::LexError::call_site(); Debug::fmt(<span class="kw-2">&</span>fallback, f) } } } } <span class="kw">impl </span>Display <span class="kw">for </span>LexError { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ LexError::Compiler(e) => Display::fmt(e, f), LexError::Fallback(e) => Display::fmt(e, f), LexError::CompilerPanic => { <span class="kw">let </span>fallback = fallback::LexError::call_site(); Display::fmt(<span class="kw-2">&</span>fallback, f) } } } } <span class="attr">#[derive(Clone)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>TokenTreeIter { Compiler(proc_macro::token_stream::IntoIter), Fallback(fallback::TokenTreeIter), } <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>) -> TokenTreeIter { <span class="kw">match </span><span class="self">self </span>{ TokenStream::Compiler(tts) => { TokenTreeIter::Compiler(tts.into_token_stream().into_iter()) } TokenStream::Fallback(tts) => TokenTreeIter::Fallback(tts.into_iter()), } } } <span class="kw">impl </span>Iterator <span class="kw">for </span>TokenTreeIter { <span class="kw">type </span>Item = TokenTree; <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><TokenTree> { <span class="kw">let </span>token = <span class="kw">match </span><span class="self">self </span>{ TokenTreeIter::Compiler(iter) => iter.next()<span class="question-mark">?</span>, TokenTreeIter::Fallback(iter) => <span class="kw">return </span>iter.next(), }; <span class="prelude-val">Some</span>(<span class="kw">match </span>token { proc_macro::TokenTree::Group(tt) => { TokenTree::Group(<span class="kw">crate</span>::Group::_new(Group::Compiler(tt))) } proc_macro::TokenTree::Punct(tt) => { <span class="kw">let </span>spacing = <span class="kw">match </span>tt.spacing() { proc_macro::Spacing::Joint => Spacing::Joint, proc_macro::Spacing::Alone => Spacing::Alone, }; <span class="kw">let </span><span class="kw-2">mut </span>o = Punct::new(tt.as_char(), spacing); o.set_span(<span class="kw">crate</span>::Span::_new(Span::Compiler(tt.span()))); TokenTree::Punct(o) } proc_macro::TokenTree::Ident(s) => { TokenTree::Ident(<span class="kw">crate</span>::Ident::_new(Ident::Compiler(s))) } proc_macro::TokenTree::Literal(l) => { TokenTree::Literal(<span class="kw">crate</span>::Literal::_new(Literal::Compiler(l))) } }) } <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { <span class="kw">match </span><span class="self">self </span>{ TokenTreeIter::Compiler(tts) => tts.size_hint(), TokenTreeIter::Fallback(tts) => tts.size_hint(), } } } <span class="attr">#[derive(Clone, PartialEq, Eq)] #[cfg(super_unstable)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>SourceFile { Compiler(proc_macro::SourceFile), Fallback(fallback::SourceFile), } <span class="attr">#[cfg(super_unstable)] </span><span class="kw">impl </span>SourceFile { <span class="kw">fn </span>nightly(sf: proc_macro::SourceFile) -> <span class="self">Self </span>{ SourceFile::Compiler(sf) } <span class="doccomment">/// Get the path to this source file as a string. </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>path(<span class="kw-2">&</span><span class="self">self</span>) -> PathBuf { <span class="kw">match </span><span class="self">self </span>{ SourceFile::Compiler(a) => a.path(), SourceFile::Fallback(a) => a.path(), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_real(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="kw">match </span><span class="self">self </span>{ SourceFile::Compiler(a) => a.is_real(), SourceFile::Fallback(a) => a.is_real(), } } } <span class="attr">#[cfg(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">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ SourceFile::Compiler(a) => Debug::fmt(a, f), SourceFile::Fallback(a) => Debug::fmt(a, f), } } } <span class="attr">#[derive(Copy, Clone)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Span { Compiler(proc_macro::Span), Fallback(fallback::Span), } <span class="kw">impl </span>Span { <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>call_site() -> <span class="self">Self </span>{ <span class="kw">if </span>inside_proc_macro() { Span::Compiler(proc_macro::Span::call_site()) } <span class="kw">else </span>{ Span::Fallback(fallback::Span::call_site()) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>mixed_site() -> <span class="self">Self </span>{ <span class="kw">if </span>inside_proc_macro() { Span::Compiler(proc_macro::Span::mixed_site()) } <span class="kw">else </span>{ Span::Fallback(fallback::Span::mixed_site()) } } <span class="attr">#[cfg(super_unstable)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>def_site() -> <span class="self">Self </span>{ <span class="kw">if </span>inside_proc_macro() { Span::Compiler(proc_macro::Span::def_site()) } <span class="kw">else </span>{ Span::Fallback(fallback::Span::def_site()) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>resolved_at(<span class="kw-2">&</span><span class="self">self</span>, other: Span) -> Span { <span class="kw">match </span>(<span class="self">self</span>, other) { (Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.resolved_at(b)), (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.resolved_at(b)), (Span::Compiler(<span class="kw">_</span>), Span::Fallback(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), (Span::Fallback(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>located_at(<span class="kw-2">&</span><span class="self">self</span>, other: Span) -> Span { <span class="kw">match </span>(<span class="self">self</span>, other) { (Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.located_at(b)), (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.located_at(b)), (Span::Compiler(<span class="kw">_</span>), Span::Fallback(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), (Span::Fallback(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>unwrap(<span class="self">self</span>) -> proc_macro::Span { <span class="kw">match </span><span class="self">self </span>{ Span::Compiler(s) => s, Span::Fallback(<span class="kw">_</span>) => <span class="macro">panic!</span>(<span class="string">"proc_macro::Span is only available in procedural macros"</span>), } } <span class="attr">#[cfg(super_unstable)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>source_file(<span class="kw-2">&</span><span class="self">self</span>) -> SourceFile { <span class="kw">match </span><span class="self">self </span>{ Span::Compiler(s) => SourceFile::nightly(s.source_file()), Span::Fallback(s) => SourceFile::Fallback(s.source_file()), } } <span class="attr">#[cfg(span_locations)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>byte_range(<span class="kw-2">&</span><span class="self">self</span>) -> Range<usize> { <span class="kw">match </span><span class="self">self </span>{ <span class="attr">#[cfg(proc_macro_span)] </span>Span::Compiler(s) => s.byte_range(), <span class="attr">#[cfg(not(proc_macro_span))] </span>Span::Compiler(<span class="kw">_</span>) => <span class="number">0</span>..<span class="number">0</span>, Span::Fallback(s) => s.byte_range(), } } <span class="attr">#[cfg(span_locations)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>start(<span class="kw-2">&</span><span class="self">self</span>) -> LineColumn { <span class="kw">match </span><span class="self">self </span>{ <span class="attr">#[cfg(proc_macro_span)] </span>Span::Compiler(s) => LineColumn { line: s.line(), column: s.column().saturating_sub(<span class="number">1</span>), }, <span class="attr">#[cfg(not(proc_macro_span))] </span>Span::Compiler(<span class="kw">_</span>) => LineColumn { line: <span class="number">0</span>, column: <span class="number">0 </span>}, Span::Fallback(s) => s.start(), } } <span class="attr">#[cfg(span_locations)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>end(<span class="kw-2">&</span><span class="self">self</span>) -> LineColumn { <span class="kw">match </span><span class="self">self </span>{ <span class="attr">#[cfg(proc_macro_span)] </span>Span::Compiler(s) => { <span class="kw">let </span>end = s.end(); LineColumn { line: end.line(), column: end.column().saturating_sub(<span class="number">1</span>), } } <span class="attr">#[cfg(not(proc_macro_span))] </span>Span::Compiler(<span class="kw">_</span>) => LineColumn { line: <span class="number">0</span>, column: <span class="number">0 </span>}, Span::Fallback(s) => s.end(), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>join(<span class="kw-2">&</span><span class="self">self</span>, other: Span) -> <span class="prelude-ty">Option</span><Span> { <span class="kw">let </span>ret = <span class="kw">match </span>(<span class="self">self</span>, other) { <span class="attr">#[cfg(proc_macro_span)] </span>(Span::Compiler(a), Span::Compiler(b)) => Span::Compiler(a.join(b)<span class="question-mark">?</span>), (Span::Fallback(a), Span::Fallback(b)) => Span::Fallback(a.join(b)<span class="question-mark">?</span>), <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, }; <span class="prelude-val">Some</span>(ret) } <span class="attr">#[cfg(super_unstable)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Span) -> bool { <span class="kw">match </span>(<span class="self">self</span>, other) { (Span::Compiler(a), Span::Compiler(b)) => a.eq(b), (Span::Fallback(a), Span::Fallback(b)) => a.eq(b), <span class="kw">_ </span>=> <span class="bool-val">false</span>, } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>source_text(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><String> { <span class="kw">match </span><span class="self">self </span>{ <span class="attr">#[cfg(not(no_source_text))] </span>Span::Compiler(s) => s.source_text(), <span class="attr">#[cfg(no_source_text)] </span>Span::Compiler(<span class="kw">_</span>) => <span class="prelude-val">None</span>, Span::Fallback(s) => s.source_text(), } } <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -> proc_macro::Span { <span class="kw">match </span><span class="self">self </span>{ Span::Compiler(s) => s, Span::Fallback(<span class="kw">_</span>) => mismatch(<span class="macro">line!</span>()), } } } <span class="kw">impl </span>From<proc_macro::Span> <span class="kw">for </span><span class="kw">crate</span>::Span { <span class="kw">fn </span>from(proc_span: proc_macro::Span) -> <span class="self">Self </span>{ <span class="kw">crate</span>::Span::_new(Span::Compiler(proc_span)) } } <span class="kw">impl </span>From<fallback::Span> <span class="kw">for </span>Span { <span class="kw">fn </span>from(inner: fallback::Span) -> <span class="self">Self </span>{ Span::Fallback(inner) } } <span class="kw">impl </span>Debug <span class="kw">for </span>Span { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ Span::Compiler(s) => Debug::fmt(s, f), Span::Fallback(s) => Debug::fmt(s, f), } } } <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">&mut </span>fmt::DebugStruct, span: Span) { <span class="kw">match </span>span { Span::Compiler(s) => { debug.field(<span class="string">"span"</span>, <span class="kw-2">&</span>s); } Span::Fallback(s) => fallback::debug_span_field_if_nontrivial(debug, s), } } <span class="attr">#[derive(Clone)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Group { Compiler(proc_macro::Group), Fallback(fallback::Group), } <span class="kw">impl </span>Group { <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(delimiter: Delimiter, stream: TokenStream) -> <span class="self">Self </span>{ <span class="kw">match </span>stream { TokenStream::Compiler(tts) => { <span class="kw">let </span>delimiter = <span class="kw">match </span>delimiter { Delimiter::Parenthesis => proc_macro::Delimiter::Parenthesis, Delimiter::Bracket => proc_macro::Delimiter::Bracket, Delimiter::Brace => proc_macro::Delimiter::Brace, Delimiter::None => proc_macro::Delimiter::None, }; Group::Compiler(proc_macro::Group::new(delimiter, tts.into_token_stream())) } TokenStream::Fallback(stream) => { Group::Fallback(fallback::Group::new(delimiter, stream)) } } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>delimiter(<span class="kw-2">&</span><span class="self">self</span>) -> Delimiter { <span class="kw">match </span><span class="self">self </span>{ Group::Compiler(g) => <span class="kw">match </span>g.delimiter() { proc_macro::Delimiter::Parenthesis => Delimiter::Parenthesis, proc_macro::Delimiter::Bracket => Delimiter::Bracket, proc_macro::Delimiter::Brace => Delimiter::Brace, proc_macro::Delimiter::None => Delimiter::None, }, Group::Fallback(g) => g.delimiter(), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>stream(<span class="kw-2">&</span><span class="self">self</span>) -> TokenStream { <span class="kw">match </span><span class="self">self </span>{ Group::Compiler(g) => TokenStream::Compiler(DeferredTokenStream::new(g.stream())), Group::Fallback(g) => TokenStream::Fallback(g.stream()), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { <span class="kw">match </span><span class="self">self </span>{ Group::Compiler(g) => Span::Compiler(g.span()), Group::Fallback(g) => Span::Fallback(g.span()), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>span_open(<span class="kw-2">&</span><span class="self">self</span>) -> Span { <span class="kw">match </span><span class="self">self </span>{ Group::Compiler(g) => Span::Compiler(g.span_open()), Group::Fallback(g) => Span::Fallback(g.span_open()), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>span_close(<span class="kw-2">&</span><span class="self">self</span>) -> Span { <span class="kw">match </span><span class="self">self </span>{ Group::Compiler(g) => Span::Compiler(g.span_close()), Group::Fallback(g) => Span::Fallback(g.span_close()), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { <span class="kw">match </span>(<span class="self">self</span>, span) { (Group::Compiler(g), Span::Compiler(s)) => g.set_span(s), (Group::Fallback(g), Span::Fallback(s)) => g.set_span(s), (Group::Compiler(<span class="kw">_</span>), Span::Fallback(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), (Group::Fallback(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), } } <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -> proc_macro::Group { <span class="kw">match </span><span class="self">self </span>{ Group::Compiler(g) => g, Group::Fallback(<span class="kw">_</span>) => mismatch(<span class="macro">line!</span>()), } } } <span class="kw">impl </span>From<fallback::Group> <span class="kw">for </span>Group { <span class="kw">fn </span>from(g: fallback::Group) -> <span class="self">Self </span>{ Group::Fallback(g) } } <span class="kw">impl </span>Display <span class="kw">for </span>Group { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, formatter: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ Group::Compiler(group) => Display::fmt(group, formatter), Group::Fallback(group) => Display::fmt(group, formatter), } } } <span class="kw">impl </span>Debug <span class="kw">for </span>Group { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, formatter: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ Group::Compiler(group) => Debug::fmt(group, formatter), Group::Fallback(group) => Debug::fmt(group, formatter), } } } <span class="attr">#[derive(Clone)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Ident { Compiler(proc_macro::Ident), Fallback(fallback::Ident), } <span class="kw">impl </span>Ident { <span class="attr">#[track_caller] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new_checked(string: <span class="kw-2">&</span>str, span: Span) -> <span class="self">Self </span>{ <span class="kw">match </span>span { Span::Compiler(s) => Ident::Compiler(proc_macro::Ident::new(string, s)), Span::Fallback(s) => Ident::Fallback(fallback::Ident::new_checked(string, s)), } } <span class="attr">#[track_caller] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new_raw_checked(string: <span class="kw-2">&</span>str, span: Span) -> <span class="self">Self </span>{ <span class="kw">match </span>span { Span::Compiler(s) => Ident::Compiler(proc_macro::Ident::new_raw(string, s)), Span::Fallback(s) => Ident::Fallback(fallback::Ident::new_raw_checked(string, s)), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { <span class="kw">match </span><span class="self">self </span>{ Ident::Compiler(t) => Span::Compiler(t.span()), Ident::Fallback(t) => Span::Fallback(t.span()), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { <span class="kw">match </span>(<span class="self">self</span>, span) { (Ident::Compiler(t), Span::Compiler(s)) => t.set_span(s), (Ident::Fallback(t), Span::Fallback(s)) => t.set_span(s), (Ident::Compiler(<span class="kw">_</span>), Span::Fallback(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), (Ident::Fallback(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), } } <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -> proc_macro::Ident { <span class="kw">match </span><span class="self">self </span>{ Ident::Compiler(s) => s, Ident::Fallback(<span class="kw">_</span>) => mismatch(<span class="macro">line!</span>()), } } } <span class="kw">impl </span>From<fallback::Ident> <span class="kw">for </span>Ident { <span class="kw">fn </span>from(inner: fallback::Ident) -> <span class="self">Self </span>{ Ident::Fallback(inner) } } <span class="kw">impl </span>PartialEq <span class="kw">for </span>Ident { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Ident) -> bool { <span class="kw">match </span>(<span class="self">self</span>, other) { (Ident::Compiler(t), Ident::Compiler(o)) => t.to_string() == o.to_string(), (Ident::Fallback(t), Ident::Fallback(o)) => t == o, (Ident::Compiler(<span class="kw">_</span>), Ident::Fallback(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), (Ident::Fallback(<span class="kw">_</span>), Ident::Compiler(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), } } } <span class="kw">impl</span><T> PartialEq<T> <span class="kw">for </span>Ident <span class="kw">where </span>T: <span class="question-mark">?</span>Sized + AsRef<str>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>T) -> bool { <span class="kw">let </span>other = other.as_ref(); <span class="kw">match </span><span class="self">self </span>{ Ident::Compiler(t) => t.to_string() == other, Ident::Fallback(t) => t == other, } } } <span class="kw">impl </span>Display <span class="kw">for </span>Ident { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ Ident::Compiler(t) => Display::fmt(t, f), Ident::Fallback(t) => Display::fmt(t, f), } } } <span class="kw">impl </span>Debug <span class="kw">for </span>Ident { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ Ident::Compiler(t) => Debug::fmt(t, f), Ident::Fallback(t) => Debug::fmt(t, f), } } } <span class="attr">#[derive(Clone)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Literal { Compiler(proc_macro::Literal), Fallback(fallback::Literal), } <span class="macro">macro_rules!</span> suffixed_numbers { ($(<span class="macro-nonterminal">$name</span>:ident => <span class="macro-nonterminal">$kind</span>:ident,)<span class="kw-2">*</span>) => ($( <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span><span class="macro-nonterminal">$name</span>(n: <span class="macro-nonterminal">$kind</span>) -> Literal { <span class="kw">if </span>inside_proc_macro() { Literal::Compiler(proc_macro::Literal::<span class="macro-nonterminal">$name</span>(n)) } <span class="kw">else </span>{ Literal::Fallback(fallback::Literal::<span class="macro-nonterminal">$name</span>(n)) } } )<span class="kw-2">*</span>) } <span class="macro">macro_rules!</span> unsuffixed_integers { ($(<span class="macro-nonterminal">$name</span>:ident => <span class="macro-nonterminal">$kind</span>:ident,)<span class="kw-2">*</span>) => ($( <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span><span class="macro-nonterminal">$name</span>(n: <span class="macro-nonterminal">$kind</span>) -> Literal { <span class="kw">if </span>inside_proc_macro() { Literal::Compiler(proc_macro::Literal::<span class="macro-nonterminal">$name</span>(n)) } <span class="kw">else </span>{ Literal::Fallback(fallback::Literal::<span class="macro-nonterminal">$name</span>(n)) } } )<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>from_str_checked(repr: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, LexError> { <span class="kw">if </span>inside_proc_macro() { <span class="kw">let </span>literal = proc_macro::Literal::from_str_checked(repr)<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>(Literal::Compiler(literal)) } <span class="kw">else </span>{ <span class="kw">let </span>literal = fallback::Literal::from_str_checked(repr)<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>(Literal::Fallback(literal)) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">unsafe fn </span>from_str_unchecked(repr: <span class="kw-2">&</span>str) -> <span class="self">Self </span>{ <span class="kw">if </span>inside_proc_macro() { Literal::Compiler(proc_macro::Literal::from_str_unchecked(repr)) } <span class="kw">else </span>{ Literal::Fallback(<span class="kw">unsafe </span>{ fallback::Literal::from_str_unchecked(repr) }) } } <span class="macro">suffixed_numbers!</span> { u8_suffixed => u8, u16_suffixed => u16, u32_suffixed => u32, u64_suffixed => u64, u128_suffixed => u128, usize_suffixed => usize, i8_suffixed => i8, i16_suffixed => i16, i32_suffixed => i32, i64_suffixed => i64, i128_suffixed => i128, isize_suffixed => isize, f32_suffixed => f32, f64_suffixed => f64, } <span class="macro">unsuffixed_integers!</span> { u8_unsuffixed => u8, u16_unsuffixed => u16, u32_unsuffixed => u32, u64_unsuffixed => u64, u128_unsuffixed => u128, usize_unsuffixed => usize, i8_unsuffixed => i8, i16_unsuffixed => i16, i32_unsuffixed => i32, i64_unsuffixed => i64, i128_unsuffixed => i128, isize_unsuffixed => isize, } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>f32_unsuffixed(f: f32) -> Literal { <span class="kw">if </span>inside_proc_macro() { Literal::Compiler(proc_macro::Literal::f32_unsuffixed(f)) } <span class="kw">else </span>{ Literal::Fallback(fallback::Literal::f32_unsuffixed(f)) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>f64_unsuffixed(f: f64) -> Literal { <span class="kw">if </span>inside_proc_macro() { Literal::Compiler(proc_macro::Literal::f64_unsuffixed(f)) } <span class="kw">else </span>{ Literal::Fallback(fallback::Literal::f64_unsuffixed(f)) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>string(string: <span class="kw-2">&</span>str) -> Literal { <span class="kw">if </span>inside_proc_macro() { Literal::Compiler(proc_macro::Literal::string(string)) } <span class="kw">else </span>{ Literal::Fallback(fallback::Literal::string(string)) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>character(ch: char) -> Literal { <span class="kw">if </span>inside_proc_macro() { Literal::Compiler(proc_macro::Literal::character(ch)) } <span class="kw">else </span>{ Literal::Fallback(fallback::Literal::character(ch)) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>byte_character(byte: u8) -> Literal { <span class="kw">if </span>inside_proc_macro() { Literal::Compiler({ <span class="attr">#[cfg(not(no_literal_byte_character))] </span>{ proc_macro::Literal::byte_character(byte) } <span class="attr">#[cfg(no_literal_byte_character)] </span>{ <span class="kw">let </span>fallback = fallback::Literal::byte_character(byte); proc_macro::Literal::from_str_unchecked(<span class="kw-2">&</span>fallback.repr) } }) } <span class="kw">else </span>{ Literal::Fallback(fallback::Literal::byte_character(byte)) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>byte_string(bytes: <span class="kw-2">&</span>[u8]) -> Literal { <span class="kw">if </span>inside_proc_macro() { Literal::Compiler(proc_macro::Literal::byte_string(bytes)) } <span class="kw">else </span>{ Literal::Fallback(fallback::Literal::byte_string(bytes)) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>c_string(string: <span class="kw-2">&</span>CStr) -> Literal { <span class="kw">if </span>inside_proc_macro() { Literal::Compiler({ <span class="attr">#[cfg(not(no_literal_c_string))] </span>{ proc_macro::Literal::c_string(string) } <span class="attr">#[cfg(no_literal_c_string)] </span>{ <span class="kw">let </span>fallback = fallback::Literal::c_string(string); proc_macro::Literal::from_str_unchecked(<span class="kw-2">&</span>fallback.repr) } }) } <span class="kw">else </span>{ Literal::Fallback(fallback::Literal::c_string(string)) } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { <span class="kw">match </span><span class="self">self </span>{ Literal::Compiler(lit) => Span::Compiler(lit.span()), Literal::Fallback(lit) => Span::Fallback(lit.span()), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { <span class="kw">match </span>(<span class="self">self</span>, span) { (Literal::Compiler(lit), Span::Compiler(s)) => lit.set_span(s), (Literal::Fallback(lit), Span::Fallback(s)) => lit.set_span(s), (Literal::Compiler(<span class="kw">_</span>), Span::Fallback(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), (Literal::Fallback(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) => mismatch(<span class="macro">line!</span>()), } } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>subspan<R: RangeBounds<usize>>(<span class="kw-2">&</span><span class="self">self</span>, range: R) -> <span class="prelude-ty">Option</span><Span> { <span class="kw">match </span><span class="self">self </span>{ <span class="attr">#[cfg(proc_macro_span)] </span>Literal::Compiler(lit) => lit.subspan(range).map(Span::Compiler), <span class="attr">#[cfg(not(proc_macro_span))] </span>Literal::Compiler(_lit) => <span class="prelude-val">None</span>, Literal::Fallback(lit) => lit.subspan(range).map(Span::Fallback), } } <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -> proc_macro::Literal { <span class="kw">match </span><span class="self">self </span>{ Literal::Compiler(s) => s, Literal::Fallback(<span class="kw">_</span>) => mismatch(<span class="macro">line!</span>()), } } } <span class="kw">impl </span>From<fallback::Literal> <span class="kw">for </span>Literal { <span class="kw">fn </span>from(s: fallback::Literal) -> <span class="self">Self </span>{ Literal::Fallback(s) } } <span class="kw">impl </span>Display <span class="kw">for </span>Literal { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ Literal::Compiler(t) => Display::fmt(t, f), Literal::Fallback(t) => Display::fmt(t, f), } } } <span class="kw">impl </span>Debug <span class="kw">for </span>Literal { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { <span class="kw">match </span><span class="self">self </span>{ Literal::Compiler(t) => Debug::fmt(t, f), Literal::Fallback(t) => Debug::fmt(t, f), } } } <span class="attr">#[cfg(span_locations)] </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>invalidate_current_thread_spans() { <span class="kw">if </span>inside_proc_macro() { <span class="macro">panic!</span>( <span class="string">"proc_macro2::extra::invalidate_current_thread_spans is not available in procedural macros" </span>); } <span class="kw">else </span>{ <span class="kw">crate</span>::fallback::invalidate_current_thread_spans(); } } </code></pre></div></section></main></body></html>