<!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 `/home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.93/src/wrapper.rs`."><title>wrapper.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="proc_macro2" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.0 (9fc6b4312 2025-01-07)" data-channel="1.84.0" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="../../static.files/src-script-56102188.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div 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" id="23">23</a>
<a href="#24" id="24">24</a>
<a href="#25" id="25">25</a>
<a href="#26" id="26">26</a>
<a href="#27" id="27">27</a>
<a href="#28" id="28">28</a>
<a href="#29" id="29">29</a>
<a href="#30" id="30">30</a>
<a href="#31" id="31">31</a>
<a href="#32" id="32">32</a>
<a href="#33" id="33">33</a>
<a href="#34" id="34">34</a>
<a href="#35" id="35">35</a>
<a href="#36" id="36">36</a>
<a href="#37" id="37">37</a>
<a href="#38" id="38">38</a>
<a href="#39" id="39">39</a>
<a href="#40" id="40">40</a>
<a href="#41" id="41">41</a>
<a href="#42" id="42">42</a>
<a href="#43" id="43">43</a>
<a href="#44" id="44">44</a>
<a href="#45" id="45">45</a>
<a href="#46" id="46">46</a>
<a href="#47" id="47">47</a>
<a href="#48" id="48">48</a>
<a href="#49" id="49">49</a>
<a href="#50" id="50">50</a>
<a href="#51" id="51">51</a>
<a href="#52" id="52">52</a>
<a href="#53" id="53">53</a>
<a href="#54" id="54">54</a>
<a href="#55" id="55">55</a>
<a href="#56" id="56">56</a>
<a href="#57" id="57">57</a>
<a href="#58" id="58">58</a>
<a href="#59" id="59">59</a>
<a href="#60" id="60">60</a>
<a href="#61" id="61">61</a>
<a href="#62" id="62">62</a>
<a href="#63" id="63">63</a>
<a href="#64" id="64">64</a>
<a href="#65" id="65">65</a>
<a href="#66" id="66">66</a>
<a href="#67" id="67">67</a>
<a href="#68" id="68">68</a>
<a href="#69" id="69">69</a>
<a href="#70" id="70">70</a>
<a href="#71" id="71">71</a>
<a href="#72" id="72">72</a>
<a href="#73" id="73">73</a>
<a href="#74" id="74">74</a>
<a href="#75" id="75">75</a>
<a href="#76" id="76">76</a>
<a href="#77" id="77">77</a>
<a href="#78" id="78">78</a>
<a href="#79" id="79">79</a>
<a href="#80" id="80">80</a>
<a href="#81" id="81">81</a>
<a href="#82" id="82">82</a>
<a href="#83" id="83">83</a>
<a href="#84" id="84">84</a>
<a href="#85" id="85">85</a>
<a href="#86" id="86">86</a>
<a href="#87" id="87">87</a>
<a href="#88" id="88">88</a>
<a href="#89" id="89">89</a>
<a href="#90" id="90">90</a>
<a href="#91" id="91">91</a>
<a href="#92" id="92">92</a>
<a href="#93" id="93">93</a>
<a href="#94" id="94">94</a>
<a href="#95" id="95">95</a>
<a href="#96" id="96">96</a>
<a href="#97" id="97">97</a>
<a href="#98" id="98">98</a>
<a href="#99" id="99">99</a>
<a href="#100" id="100">100</a>
<a href="#101" id="101">101</a>
<a href="#102" id="102">102</a>
<a href="#103" id="103">103</a>
<a href="#104" id="104">104</a>
<a href="#105" id="105">105</a>
<a href="#106" id="106">106</a>
<a href="#107" id="107">107</a>
<a href="#108" id="108">108</a>
<a href="#109" id="109">109</a>
<a href="#110" id="110">110</a>
<a href="#111" id="111">111</a>
<a href="#112" id="112">112</a>
<a href="#113" id="113">113</a>
<a href="#114" id="114">114</a>
<a href="#115" id="115">115</a>
<a href="#116" id="116">116</a>
<a href="#117" id="117">117</a>
<a href="#118" id="118">118</a>
<a href="#119" id="119">119</a>
<a href="#120" id="120">120</a>
<a href="#121" id="121">121</a>
<a href="#122" id="122">122</a>
<a href="#123" id="123">123</a>
<a href="#124" id="124">124</a>
<a href="#125" id="125">125</a>
<a href="#126" id="126">126</a>
<a href="#127" id="127">127</a>
<a href="#128" id="128">128</a>
<a href="#129" id="129">129</a>
<a href="#130" id="130">130</a>
<a href="#131" id="131">131</a>
<a href="#132" id="132">132</a>
<a href="#133" id="133">133</a>
<a href="#134" id="134">134</a>
<a href="#135" id="135">135</a>
<a href="#136" id="136">136</a>
<a href="#137" id="137">137</a>
<a href="#138" id="138">138</a>
<a href="#139" id="139">139</a>
<a href="#140" id="140">140</a>
<a href="#141" id="141">141</a>
<a href="#142" id="142">142</a>
<a href="#143" id="143">143</a>
<a href="#144" id="144">144</a>
<a href="#145" id="145">145</a>
<a href="#146" id="146">146</a>
<a href="#147" id="147">147</a>
<a href="#148" id="148">148</a>
<a href="#149" id="149">149</a>
<a href="#150" id="150">150</a>
<a href="#151" id="151">151</a>
<a href="#152" id="152">152</a>
<a href="#153" id="153">153</a>
<a href="#154" id="154">154</a>
<a href="#155" id="155">155</a>
<a href="#156" id="156">156</a>
<a href="#157" id="157">157</a>
<a href="#158" id="158">158</a>
<a href="#159" id="159">159</a>
<a href="#160" id="160">160</a>
<a href="#161" id="161">161</a>
<a href="#162" id="162">162</a>
<a href="#163" id="163">163</a>
<a href="#164" id="164">164</a>
<a href="#165" id="165">165</a>
<a href="#166" id="166">166</a>
<a href="#167" id="167">167</a>
<a href="#168" id="168">168</a>
<a href="#169" id="169">169</a>
<a href="#170" id="170">170</a>
<a href="#171" id="171">171</a>
<a href="#172" id="172">172</a>
<a href="#173" id="173">173</a>
<a href="#174" id="174">174</a>
<a href="#175" id="175">175</a>
<a href="#176" id="176">176</a>
<a href="#177" id="177">177</a>
<a href="#178" id="178">178</a>
<a href="#179" id="179">179</a>
<a href="#180" id="180">180</a>
<a href="#181" id="181">181</a>
<a href="#182" id="182">182</a>
<a href="#183" id="183">183</a>
<a href="#184" id="184">184</a>
<a href="#185" id="185">185</a>
<a href="#186" id="186">186</a>
<a href="#187" id="187">187</a>
<a href="#188" id="188">188</a>
<a href="#189" id="189">189</a>
<a href="#190" id="190">190</a>
<a href="#191" id="191">191</a>
<a href="#192" id="192">192</a>
<a href="#193" id="193">193</a>
<a href="#194" id="194">194</a>
<a href="#195" id="195">195</a>
<a href="#196" id="196">196</a>
<a href="#197" id="197">197</a>
<a href="#198" id="198">198</a>
<a href="#199" id="199">199</a>
<a href="#200" id="200">200</a>
<a href="#201" id="201">201</a>
<a href="#202" id="202">202</a>
<a href="#203" id="203">203</a>
<a href="#204" id="204">204</a>
<a href="#205" id="205">205</a>
<a href="#206" id="206">206</a>
<a href="#207" id="207">207</a>
<a href="#208" id="208">208</a>
<a href="#209" id="209">209</a>
<a href="#210" id="210">210</a>
<a href="#211" id="211">211</a>
<a href="#212" id="212">212</a>
<a href="#213" id="213">213</a>
<a href="#214" id="214">214</a>
<a href="#215" id="215">215</a>
<a href="#216" id="216">216</a>
<a href="#217" id="217">217</a>
<a href="#218" id="218">218</a>
<a href="#219" id="219">219</a>
<a href="#220" id="220">220</a>
<a href="#221" id="221">221</a>
<a href="#222" id="222">222</a>
<a href="#223" id="223">223</a>
<a href="#224" id="224">224</a>
<a href="#225" id="225">225</a>
<a href="#226" id="226">226</a>
<a href="#227" id="227">227</a>
<a href="#228" id="228">228</a>
<a href="#229" id="229">229</a>
<a href="#230" id="230">230</a>
<a href="#231" id="231">231</a>
<a href="#232" id="232">232</a>
<a href="#233" id="233">233</a>
<a href="#234" id="234">234</a>
<a href="#235" id="235">235</a>
<a href="#236" id="236">236</a>
<a href="#237" id="237">237</a>
<a href="#238" id="238">238</a>
<a href="#239" id="239">239</a>
<a href="#240" id="240">240</a>
<a href="#241" id="241">241</a>
<a href="#242" id="242">242</a>
<a href="#243" id="243">243</a>
<a href="#244" id="244">244</a>
<a href="#245" id="245">245</a>
<a href="#246" id="246">246</a>
<a href="#247" id="247">247</a>
<a href="#248" id="248">248</a>
<a href="#249" id="249">249</a>
<a href="#250" id="250">250</a>
<a href="#251" id="251">251</a>
<a href="#252" id="252">252</a>
<a href="#253" id="253">253</a>
<a href="#254" id="254">254</a>
<a href="#255" id="255">255</a>
<a href="#256" id="256">256</a>
<a href="#257" id="257">257</a>
<a href="#258" id="258">258</a>
<a href="#259" id="259">259</a>
<a href="#260" id="260">260</a>
<a href="#261" id="261">261</a>
<a href="#262" id="262">262</a>
<a href="#263" id="263">263</a>
<a href="#264" id="264">264</a>
<a href="#265" id="265">265</a>
<a href="#266" id="266">266</a>
<a href="#267" id="267">267</a>
<a href="#268" id="268">268</a>
<a href="#269" id="269">269</a>
<a href="#270" id="270">270</a>
<a href="#271" id="271">271</a>
<a href="#272" id="272">272</a>
<a href="#273" id="273">273</a>
<a href="#274" id="274">274</a>
<a href="#275" id="275">275</a>
<a href="#276" id="276">276</a>
<a href="#277" id="277">277</a>
<a href="#278" id="278">278</a>
<a href="#279" id="279">279</a>
<a href="#280" id="280">280</a>
<a href="#281" id="281">281</a>
<a href="#282" id="282">282</a>
<a href="#283" id="283">283</a>
<a href="#284" id="284">284</a>
<a href="#285" id="285">285</a>
<a href="#286" id="286">286</a>
<a href="#287" id="287">287</a>
<a href="#288" id="288">288</a>
<a href="#289" id="289">289</a>
<a href="#290" id="290">290</a>
<a href="#291" id="291">291</a>
<a href="#292" id="292">292</a>
<a href="#293" id="293">293</a>
<a href="#294" id="294">294</a>
<a href="#295" id="295">295</a>
<a href="#296" id="296">296</a>
<a href="#297" id="297">297</a>
<a href="#298" id="298">298</a>
<a href="#299" id="299">299</a>
<a href="#300" id="300">300</a>
<a href="#301" id="301">301</a>
<a href="#302" id="302">302</a>
<a href="#303" id="303">303</a>
<a href="#304" id="304">304</a>
<a href="#305" id="305">305</a>
<a href="#306" id="306">306</a>
<a href="#307" id="307">307</a>
<a href="#308" id="308">308</a>
<a href="#309" id="309">309</a>
<a href="#310" id="310">310</a>
<a href="#311" id="311">311</a>
<a href="#312" id="312">312</a>
<a href="#313" id="313">313</a>
<a href="#314" id="314">314</a>
<a href="#315" id="315">315</a>
<a href="#316" id="316">316</a>
<a href="#317" id="317">317</a>
<a href="#318" id="318">318</a>
<a href="#319" id="319">319</a>
<a href="#320" id="320">320</a>
<a href="#321" id="321">321</a>
<a href="#322" id="322">322</a>
<a href="#323" id="323">323</a>
<a href="#324" id="324">324</a>
<a href="#325" id="325">325</a>
<a href="#326" id="326">326</a>
<a href="#327" id="327">327</a>
<a href="#328" id="328">328</a>
<a href="#329" id="329">329</a>
<a href="#330" id="330">330</a>
<a href="#331" id="331">331</a>
<a href="#332" id="332">332</a>
<a href="#333" id="333">333</a>
<a href="#334" id="334">334</a>
<a href="#335" id="335">335</a>
<a href="#336" id="336">336</a>
<a href="#337" id="337">337</a>
<a href="#338" id="338">338</a>
<a href="#339" id="339">339</a>
<a href="#340" id="340">340</a>
<a href="#341" id="341">341</a>
<a href="#342" id="342">342</a>
<a href="#343" id="343">343</a>
<a href="#344" id="344">344</a>
<a href="#345" id="345">345</a>
<a href="#346" id="346">346</a>
<a href="#347" id="347">347</a>
<a href="#348" id="348">348</a>
<a href="#349" id="349">349</a>
<a href="#350" id="350">350</a>
<a href="#351" id="351">351</a>
<a href="#352" id="352">352</a>
<a href="#353" id="353">353</a>
<a href="#354" id="354">354</a>
<a href="#355" id="355">355</a>
<a href="#356" id="356">356</a>
<a href="#357" id="357">357</a>
<a href="#358" id="358">358</a>
<a href="#359" id="359">359</a>
<a href="#360" id="360">360</a>
<a href="#361" id="361">361</a>
<a href="#362" id="362">362</a>
<a href="#363" id="363">363</a>
<a href="#364" id="364">364</a>
<a href="#365" id="365">365</a>
<a href="#366" id="366">366</a>
<a href="#367" id="367">367</a>
<a href="#368" id="368">368</a>
<a href="#369" id="369">369</a>
<a href="#370" id="370">370</a>
<a href="#371" id="371">371</a>
<a href="#372" id="372">372</a>
<a href="#373" id="373">373</a>
<a href="#374" id="374">374</a>
<a href="#375" id="375">375</a>
<a href="#376" id="376">376</a>
<a href="#377" id="377">377</a>
<a href="#378" id="378">378</a>
<a href="#379" id="379">379</a>
<a href="#380" id="380">380</a>
<a href="#381" id="381">381</a>
<a href="#382" id="382">382</a>
<a href="#383" id="383">383</a>
<a href="#384" id="384">384</a>
<a href="#385" id="385">385</a>
<a href="#386" id="386">386</a>
<a href="#387" id="387">387</a>
<a href="#388" id="388">388</a>
<a href="#389" id="389">389</a>
<a href="#390" id="390">390</a>
<a href="#391" id="391">391</a>
<a href="#392" id="392">392</a>
<a href="#393" id="393">393</a>
<a href="#394" id="394">394</a>
<a href="#395" id="395">395</a>
<a href="#396" id="396">396</a>
<a href="#397" id="397">397</a>
<a href="#398" id="398">398</a>
<a href="#399" id="399">399</a>
<a href="#400" id="400">400</a>
<a href="#401" id="401">401</a>
<a href="#402" id="402">402</a>
<a href="#403" id="403">403</a>
<a href="#404" id="404">404</a>
<a href="#405" id="405">405</a>
<a href="#406" id="406">406</a>
<a href="#407" id="407">407</a>
<a href="#408" id="408">408</a>
<a href="#409" id="409">409</a>
<a href="#410" id="410">410</a>
<a href="#411" id="411">411</a>
<a href="#412" id="412">412</a>
<a href="#413" id="413">413</a>
<a href="#414" id="414">414</a>
<a href="#415" id="415">415</a>
<a href="#416" id="416">416</a>
<a href="#417" id="417">417</a>
<a href="#418" id="418">418</a>
<a href="#419" id="419">419</a>
<a href="#420" id="420">420</a>
<a href="#421" id="421">421</a>
<a href="#422" id="422">422</a>
<a href="#423" id="423">423</a>
<a href="#424" id="424">424</a>
<a href="#425" id="425">425</a>
<a href="#426" id="426">426</a>
<a href="#427" id="427">427</a>
<a href="#428" id="428">428</a>
<a href="#429" id="429">429</a>
<a href="#430" id="430">430</a>
<a href="#431" id="431">431</a>
<a href="#432" id="432">432</a>
<a href="#433" id="433">433</a>
<a href="#434" id="434">434</a>
<a href="#435" id="435">435</a>
<a href="#436" id="436">436</a>
<a href="#437" id="437">437</a>
<a href="#438" id="438">438</a>
<a href="#439" id="439">439</a>
<a href="#440" id="440">440</a>
<a href="#441" id="441">441</a>
<a href="#442" id="442">442</a>
<a href="#443" id="443">443</a>
<a href="#444" id="444">444</a>
<a href="#445" id="445">445</a>
<a href="#446" id="446">446</a>
<a href="#447" id="447">447</a>
<a href="#448" id="448">448</a>
<a href="#449" id="449">449</a>
<a href="#450" id="450">450</a>
<a href="#451" id="451">451</a>
<a href="#452" id="452">452</a>
<a href="#453" id="453">453</a>
<a href="#454" id="454">454</a>
<a href="#455" id="455">455</a>
<a href="#456" id="456">456</a>
<a href="#457" id="457">457</a>
<a href="#458" id="458">458</a>
<a href="#459" id="459">459</a>
<a href="#460" id="460">460</a>
<a href="#461" id="461">461</a>
<a href="#462" id="462">462</a>
<a href="#463" id="463">463</a>
<a href="#464" id="464">464</a>
<a href="#465" id="465">465</a>
<a href="#466" id="466">466</a>
<a href="#467" id="467">467</a>
<a href="#468" id="468">468</a>
<a href="#469" id="469">469</a>
<a href="#470" id="470">470</a>
<a href="#471" id="471">471</a>
<a href="#472" id="472">472</a>
<a href="#473" id="473">473</a>
<a href="#474" id="474">474</a>
<a href="#475" id="475">475</a>
<a href="#476" id="476">476</a>
<a href="#477" id="477">477</a>
<a href="#478" id="478">478</a>
<a href="#479" id="479">479</a>
<a href="#480" id="480">480</a>
<a href="#481" id="481">481</a>
<a href="#482" id="482">482</a>
<a href="#483" id="483">483</a>
<a href="#484" id="484">484</a>
<a href="#485" id="485">485</a>
<a href="#486" id="486">486</a>
<a href="#487" id="487">487</a>
<a href="#488" id="488">488</a>
<a href="#489" id="489">489</a>
<a href="#490" id="490">490</a>
<a href="#491" id="491">491</a>
<a href="#492" id="492">492</a>
<a href="#493" id="493">493</a>
<a href="#494" id="494">494</a>
<a href="#495" id="495">495</a>
<a href="#496" id="496">496</a>
<a href="#497" id="497">497</a>
<a href="#498" id="498">498</a>
<a href="#499" id="499">499</a>
<a href="#500" id="500">500</a>
<a href="#501" id="501">501</a>
<a href="#502" id="502">502</a>
<a href="#503" id="503">503</a>
<a href="#504" id="504">504</a>
<a href="#505" id="505">505</a>
<a href="#506" id="506">506</a>
<a href="#507" id="507">507</a>
<a href="#508" id="508">508</a>
<a href="#509" id="509">509</a>
<a href="#510" id="510">510</a>
<a href="#511" id="511">511</a>
<a href="#512" id="512">512</a>
<a href="#513" id="513">513</a>
<a href="#514" id="514">514</a>
<a href="#515" id="515">515</a>
<a href="#516" id="516">516</a>
<a href="#517" id="517">517</a>
<a href="#518" id="518">518</a>
<a href="#519" id="519">519</a>
<a href="#520" id="520">520</a>
<a href="#521" id="521">521</a>
<a href="#522" id="522">522</a>
<a href="#523" id="523">523</a>
<a href="#524" id="524">524</a>
<a href="#525" id="525">525</a>
<a href="#526" id="526">526</a>
<a href="#527" id="527">527</a>
<a href="#528" id="528">528</a>
<a href="#529" id="529">529</a>
<a href="#530" id="530">530</a>
<a href="#531" id="531">531</a>
<a href="#532" id="532">532</a>
<a href="#533" id="533">533</a>
<a href="#534" id="534">534</a>
<a href="#535" id="535">535</a>
<a href="#536" id="536">536</a>
<a href="#537" id="537">537</a>
<a href="#538" id="538">538</a>
<a href="#539" id="539">539</a>
<a href="#540" id="540">540</a>
<a href="#541" id="541">541</a>
<a href="#542" id="542">542</a>
<a href="#543" id="543">543</a>
<a href="#544" id="544">544</a>
<a href="#545" id="545">545</a>
<a href="#546" id="546">546</a>
<a href="#547" id="547">547</a>
<a href="#548" id="548">548</a>
<a href="#549" id="549">549</a>
<a href="#550" id="550">550</a>
<a href="#551" id="551">551</a>
<a href="#552" id="552">552</a>
<a href="#553" id="553">553</a>
<a href="#554" id="554">554</a>
<a href="#555" id="555">555</a>
<a href="#556" id="556">556</a>
<a href="#557" id="557">557</a>
<a href="#558" id="558">558</a>
<a href="#559" id="559">559</a>
<a href="#560" id="560">560</a>
<a href="#561" id="561">561</a>
<a href="#562" id="562">562</a>
<a href="#563" id="563">563</a>
<a href="#564" id="564">564</a>
<a href="#565" id="565">565</a>
<a href="#566" id="566">566</a>
<a href="#567" id="567">567</a>
<a href="#568" id="568">568</a>
<a href="#569" id="569">569</a>
<a href="#570" id="570">570</a>
<a href="#571" id="571">571</a>
<a href="#572" id="572">572</a>
<a href="#573" id="573">573</a>
<a href="#574" id="574">574</a>
<a href="#575" id="575">575</a>
<a href="#576" id="576">576</a>
<a href="#577" id="577">577</a>
<a href="#578" id="578">578</a>
<a href="#579" id="579">579</a>
<a href="#580" id="580">580</a>
<a href="#581" id="581">581</a>
<a href="#582" id="582">582</a>
<a href="#583" id="583">583</a>
<a href="#584" id="584">584</a>
<a href="#585" id="585">585</a>
<a href="#586" id="586">586</a>
<a href="#587" id="587">587</a>
<a href="#588" id="588">588</a>
<a href="#589" id="589">589</a>
<a href="#590" id="590">590</a>
<a href="#591" id="591">591</a>
<a href="#592" id="592">592</a>
<a href="#593" id="593">593</a>
<a href="#594" id="594">594</a>
<a href="#595" id="595">595</a>
<a href="#596" id="596">596</a>
<a href="#597" id="597">597</a>
<a href="#598" id="598">598</a>
<a href="#599" id="599">599</a>
<a href="#600" id="600">600</a>
<a href="#601" id="601">601</a>
<a href="#602" id="602">602</a>
<a href="#603" id="603">603</a>
<a href="#604" id="604">604</a>
<a href="#605" id="605">605</a>
<a href="#606" id="606">606</a>
<a href="#607" id="607">607</a>
<a href="#608" id="608">608</a>
<a href="#609" id="609">609</a>
<a href="#610" id="610">610</a>
<a href="#611" id="611">611</a>
<a href="#612" id="612">612</a>
<a href="#613" id="613">613</a>
<a href="#614" id="614">614</a>
<a href="#615" id="615">615</a>
<a href="#616" id="616">616</a>
<a href="#617" id="617">617</a>
<a href="#618" id="618">618</a>
<a href="#619" id="619">619</a>
<a href="#620" id="620">620</a>
<a href="#621" id="621">621</a>
<a href="#622" id="622">622</a>
<a href="#623" id="623">623</a>
<a href="#624" id="624">624</a>
<a href="#625" id="625">625</a>
<a href="#626" id="626">626</a>
<a href="#627" id="627">627</a>
<a href="#628" id="628">628</a>
<a href="#629" id="629">629</a>
<a href="#630" id="630">630</a>
<a href="#631" id="631">631</a>
<a href="#632" id="632">632</a>
<a href="#633" id="633">633</a>
<a href="#634" id="634">634</a>
<a href="#635" id="635">635</a>
<a href="#636" id="636">636</a>
<a href="#637" id="637">637</a>
<a href="#638" id="638">638</a>
<a href="#639" id="639">639</a>
<a href="#640" id="640">640</a>
<a href="#641" id="641">641</a>
<a href="#642" id="642">642</a>
<a href="#643" id="643">643</a>
<a href="#644" id="644">644</a>
<a href="#645" id="645">645</a>
<a href="#646" id="646">646</a>
<a href="#647" id="647">647</a>
<a href="#648" id="648">648</a>
<a href="#649" id="649">649</a>
<a href="#650" id="650">650</a>
<a href="#651" id="651">651</a>
<a href="#652" id="652">652</a>
<a href="#653" id="653">653</a>
<a href="#654" id="654">654</a>
<a href="#655" id="655">655</a>
<a href="#656" id="656">656</a>
<a href="#657" id="657">657</a>
<a href="#658" id="658">658</a>
<a href="#659" id="659">659</a>
<a href="#660" id="660">660</a>
<a href="#661" id="661">661</a>
<a href="#662" id="662">662</a>
<a href="#663" id="663">663</a>
<a href="#664" id="664">664</a>
<a href="#665" id="665">665</a>
<a href="#666" id="666">666</a>
<a href="#667" id="667">667</a>
<a href="#668" id="668">668</a>
<a href="#669" id="669">669</a>
<a href="#670" id="670">670</a>
<a href="#671" id="671">671</a>
<a href="#672" id="672">672</a>
<a href="#673" id="673">673</a>
<a href="#674" id="674">674</a>
<a href="#675" id="675">675</a>
<a href="#676" id="676">676</a>
<a href="#677" id="677">677</a>
<a href="#678" id="678">678</a>
<a href="#679" id="679">679</a>
<a href="#680" id="680">680</a>
<a href="#681" id="681">681</a>
<a href="#682" id="682">682</a>
<a href="#683" id="683">683</a>
<a href="#684" id="684">684</a>
<a href="#685" id="685">685</a>
<a href="#686" id="686">686</a>
<a href="#687" id="687">687</a>
<a href="#688" id="688">688</a>
<a href="#689" id="689">689</a>
<a href="#690" id="690">690</a>
<a href="#691" id="691">691</a>
<a href="#692" id="692">692</a>
<a href="#693" id="693">693</a>
<a href="#694" id="694">694</a>
<a href="#695" id="695">695</a>
<a href="#696" id="696">696</a>
<a href="#697" id="697">697</a>
<a href="#698" id="698">698</a>
<a href="#699" id="699">699</a>
<a href="#700" id="700">700</a>
<a href="#701" id="701">701</a>
<a href="#702" id="702">702</a>
<a href="#703" id="703">703</a>
<a href="#704" id="704">704</a>
<a href="#705" id="705">705</a>
<a href="#706" id="706">706</a>
<a href="#707" id="707">707</a>
<a href="#708" id="708">708</a>
<a href="#709" id="709">709</a>
<a href="#710" id="710">710</a>
<a href="#711" id="711">711</a>
<a href="#712" id="712">712</a>
<a href="#713" id="713">713</a>
<a href="#714" id="714">714</a>
<a href="#715" id="715">715</a>
<a href="#716" id="716">716</a>
<a href="#717" id="717">717</a>
<a href="#718" id="718">718</a>
<a href="#719" id="719">719</a>
<a href="#720" id="720">720</a>
<a href="#721" id="721">721</a>
<a href="#722" id="722">722</a>
<a href="#723" id="723">723</a>
<a href="#724" id="724">724</a>
<a href="#725" id="725">725</a>
<a href="#726" id="726">726</a>
<a href="#727" id="727">727</a>
<a href="#728" id="728">728</a>
<a href="#729" id="729">729</a>
<a href="#730" id="730">730</a>
<a href="#731" id="731">731</a>
<a href="#732" id="732">732</a>
<a href="#733" id="733">733</a>
<a href="#734" id="734">734</a>
<a href="#735" id="735">735</a>
<a href="#736" id="736">736</a>
<a href="#737" id="737">737</a>
<a href="#738" id="738">738</a>
<a href="#739" id="739">739</a>
<a href="#740" id="740">740</a>
<a href="#741" id="741">741</a>
<a href="#742" id="742">742</a>
<a href="#743" id="743">743</a>
<a href="#744" id="744">744</a>
<a href="#745" id="745">745</a>
<a href="#746" id="746">746</a>
<a href="#747" id="747">747</a>
<a href="#748" id="748">748</a>
<a href="#749" id="749">749</a>
<a href="#750" id="750">750</a>
<a href="#751" id="751">751</a>
<a href="#752" id="752">752</a>
<a href="#753" id="753">753</a>
<a href="#754" id="754">754</a>
<a href="#755" id="755">755</a>
<a href="#756" id="756">756</a>
<a href="#757" id="757">757</a>
<a href="#758" id="758">758</a>
<a href="#759" id="759">759</a>
<a href="#760" id="760">760</a>
<a href="#761" id="761">761</a>
<a href="#762" id="762">762</a>
<a href="#763" id="763">763</a>
<a href="#764" id="764">764</a>
<a href="#765" id="765">765</a>
<a href="#766" id="766">766</a>
<a href="#767" id="767">767</a>
<a href="#768" id="768">768</a>
<a href="#769" id="769">769</a>
<a href="#770" id="770">770</a>
<a href="#771" id="771">771</a>
<a href="#772" id="772">772</a>
<a href="#773" id="773">773</a>
<a href="#774" id="774">774</a>
<a href="#775" id="775">775</a>
<a href="#776" id="776">776</a>
<a href="#777" id="777">777</a>
<a href="#778" id="778">778</a>
<a href="#779" id="779">779</a>
<a href="#780" id="780">780</a>
<a href="#781" id="781">781</a>
<a href="#782" id="782">782</a>
<a href="#783" id="783">783</a>
<a href="#784" id="784">784</a>
<a href="#785" id="785">785</a>
<a href="#786" id="786">786</a>
<a href="#787" id="787">787</a>
<a href="#788" id="788">788</a>
<a href="#789" id="789">789</a>
<a href="#790" id="790">790</a>
<a href="#791" id="791">791</a>
<a href="#792" id="792">792</a>
<a href="#793" id="793">793</a>
<a href="#794" id="794">794</a>
<a href="#795" id="795">795</a>
<a href="#796" id="796">796</a>
<a href="#797" id="797">797</a>
<a href="#798" id="798">798</a>
<a href="#799" id="799">799</a>
<a href="#800" id="800">800</a>
<a href="#801" id="801">801</a>
<a href="#802" id="802">802</a>
<a href="#803" id="803">803</a>
<a href="#804" id="804">804</a>
<a href="#805" id="805">805</a>
<a href="#806" id="806">806</a>
<a href="#807" id="807">807</a>
<a href="#808" id="808">808</a>
<a href="#809" id="809">809</a>
<a href="#810" id="810">810</a>
<a href="#811" id="811">811</a>
<a href="#812" id="812">812</a>
<a href="#813" id="813">813</a>
<a href="#814" id="814">814</a>
<a href="#815" id="815">815</a>
<a href="#816" id="816">816</a>
<a href="#817" id="817">817</a>
<a href="#818" id="818">818</a>
<a href="#819" id="819">819</a>
<a href="#820" id="820">820</a>
<a href="#821" id="821">821</a>
<a href="#822" id="822">822</a>
<a href="#823" id="823">823</a>
<a href="#824" id="824">824</a>
<a href="#825" id="825">825</a>
<a href="#826" id="826">826</a>
<a href="#827" id="827">827</a>
<a href="#828" id="828">828</a>
<a href="#829" id="829">829</a>
<a href="#830" id="830">830</a>
<a href="#831" id="831">831</a>
<a href="#832" id="832">832</a>
<a href="#833" id="833">833</a>
<a href="#834" id="834">834</a>
<a href="#835" id="835">835</a>
<a href="#836" id="836">836</a>
<a href="#837" id="837">837</a>
<a href="#838" id="838">838</a>
<a href="#839" id="839">839</a>
<a href="#840" id="840">840</a>
<a href="#841" id="841">841</a>
<a href="#842" id="842">842</a>
<a href="#843" id="843">843</a>
<a href="#844" id="844">844</a>
<a href="#845" id="845">845</a>
<a href="#846" id="846">846</a>
<a href="#847" id="847">847</a>
<a href="#848" id="848">848</a>
<a href="#849" id="849">849</a>
<a href="#850" id="850">850</a>
<a href="#851" id="851">851</a>
<a href="#852" id="852">852</a>
<a href="#853" id="853">853</a>
<a href="#854" id="854">854</a>
<a href="#855" id="855">855</a>
<a href="#856" id="856">856</a>
<a href="#857" id="857">857</a>
<a href="#858" id="858">858</a>
<a href="#859" id="859">859</a>
<a href="#860" id="860">860</a>
<a href="#861" id="861">861</a>
<a href="#862" id="862">862</a>
<a href="#863" id="863">863</a>
<a href="#864" id="864">864</a>
<a href="#865" id="865">865</a>
<a href="#866" id="866">866</a>
<a href="#867" id="867">867</a>
<a href="#868" id="868">868</a>
<a href="#869" id="869">869</a>
<a href="#870" id="870">870</a>
<a href="#871" id="871">871</a>
<a href="#872" id="872">872</a>
<a href="#873" id="873">873</a>
<a href="#874" id="874">874</a>
<a href="#875" id="875">875</a>
<a href="#876" id="876">876</a>
<a href="#877" id="877">877</a>
<a href="#878" id="878">878</a>
<a href="#879" id="879">879</a>
<a href="#880" id="880">880</a>
<a href="#881" id="881">881</a>
<a href="#882" id="882">882</a>
<a href="#883" id="883">883</a>
<a href="#884" id="884">884</a>
<a href="#885" id="885">885</a>
<a href="#886" id="886">886</a>
<a href="#887" id="887">887</a>
<a href="#888" id="888">888</a>
<a href="#889" id="889">889</a>
<a href="#890" id="890">890</a>
<a href="#891" id="891">891</a>
<a href="#892" id="892">892</a>
<a href="#893" id="893">893</a>
<a href="#894" id="894">894</a>
<a href="#895" id="895">895</a>
<a href="#896" id="896">896</a>
<a href="#897" id="897">897</a>
<a href="#898" id="898">898</a>
<a href="#899" id="899">899</a>
<a href="#900" id="900">900</a>
<a href="#901" id="901">901</a>
<a href="#902" id="902">902</a>
<a href="#903" id="903">903</a>
<a href="#904" id="904">904</a>
<a href="#905" id="905">905</a>
<a href="#906" id="906">906</a>
<a href="#907" id="907">907</a>
<a href="#908" id="908">908</a>
<a href="#909" id="909">909</a>
<a href="#910" id="910">910</a>
<a href="#911" id="911">911</a>
<a href="#912" id="912">912</a>
<a href="#913" id="913">913</a>
<a href="#914" id="914">914</a>
<a href="#915" id="915">915</a>
<a href="#916" id="916">916</a>
<a href="#917" id="917">917</a>
<a href="#918" id="918">918</a>
<a href="#919" id="919">919</a>
<a href="#920" id="920">920</a>
<a href="#921" id="921">921</a>
<a href="#922" id="922">922</a>
<a href="#923" id="923">923</a>
<a href="#924" id="924">924</a>
<a href="#925" id="925">925</a>
<a href="#926" id="926">926</a>
<a href="#927" id="927">927</a>
<a href="#928" id="928">928</a>
<a href="#929" id="929">929</a>
<a href="#930" 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&lt;TokenTree&gt; 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&lt;proc_macro::TokenTree&gt;,
}

<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) -&gt; ! {
    <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) -&gt; <span class="self">Self </span>{
        DeferredTokenStream {
            stream,
            extra: Vec::new(),
        }
    }

    <span class="kw">fn </span>is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
        <span class="self">self</span>.stream.is_empty() &amp;&amp; <span class="self">self</span>.extra.is_empty()
    }

    <span class="kw">fn </span>evaluate_now(<span class="kw-2">&amp;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>) -&gt; 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() -&gt; <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">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, LexError&gt; {
        <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">&amp;</span><span class="self">self</span>) -&gt; bool {
        <span class="kw">match </span><span class="self">self </span>{
            TokenStream::Compiler(tts) =&gt; tts.is_empty(),
            TokenStream::Fallback(tts) =&gt; tts.is_empty(),
        }
    }

    <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -&gt; proc_macro::TokenStream {
        <span class="kw">match </span><span class="self">self </span>{
            TokenStream::Compiler(s) =&gt; s.into_token_stream(),
            TokenStream::Fallback(<span class="kw">_</span>) =&gt; mismatch(<span class="macro">line!</span>()),
        }
    }

    <span class="kw">fn </span>unwrap_stable(<span class="self">self</span>) -&gt; fallback::TokenStream {
        <span class="kw">match </span><span class="self">self </span>{
            TokenStream::Compiler(<span class="kw">_</span>) =&gt; mismatch(<span class="macro">line!</span>()),
            TokenStream::Fallback(s) =&gt; s,
        }
    }
}

<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">match </span><span class="self">self </span>{
            TokenStream::Compiler(tts) =&gt; Display::fmt(<span class="kw-2">&amp;</span>tts.clone().into_token_stream(), f),
            TokenStream::Fallback(tts) =&gt; Display::fmt(tts, f),
        }
    }
}

<span class="kw">impl </span>From&lt;proc_macro::TokenStream&gt; <span class="kw">for </span>TokenStream {
    <span class="kw">fn </span>from(inner: proc_macro::TokenStream) -&gt; <span class="self">Self </span>{
        TokenStream::Compiler(DeferredTokenStream::new(inner))
    }
}

<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>{
        <span class="kw">match </span>inner {
            TokenStream::Compiler(inner) =&gt; inner.into_token_stream(),
            TokenStream::Fallback(inner) =&gt; {
                proc_macro::TokenStream::from_str_unchecked(<span class="kw-2">&amp;</span>inner.to_string())
            }
        }
    }
}

<span class="kw">impl </span>From&lt;fallback::TokenStream&gt; <span class="kw">for </span>TokenStream {
    <span class="kw">fn </span>from(inner: fallback::TokenStream) -&gt; <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) -&gt; proc_macro::TokenTree {
    <span class="kw">match </span>token {
        TokenTree::Group(tt) =&gt; proc_macro::TokenTree::Group(tt.inner.unwrap_nightly()),
        TokenTree::Punct(tt) =&gt; {
            <span class="kw">let </span>spacing = <span class="kw">match </span>tt.spacing() {
                Spacing::Joint =&gt; proc_macro::Spacing::Joint,
                Spacing::Alone =&gt; 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) =&gt; proc_macro::TokenTree::Ident(tt.inner.unwrap_nightly()),
        TokenTree::Literal(tt) =&gt; proc_macro::TokenTree::Literal(tt.inner.unwrap_nightly()),
    }
}

<span class="kw">impl </span>From&lt;TokenTree&gt; <span class="kw">for </span>TokenStream {
    <span class="kw">fn </span>from(token: TokenTree) -&gt; <span class="self">Self </span>{
        <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&lt;TokenTree&gt; <span class="kw">for </span>TokenStream {
    <span class="kw">fn </span>from_iter&lt;I: IntoIterator&lt;Item = TokenTree&gt;&gt;(trees: I) -&gt; <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&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>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)) =&gt; {
                first.evaluate_now();
                first.stream.extend(streams.map(|s| <span class="kw">match </span>s {
                    TokenStream::Compiler(s) =&gt; s.into_token_stream(),
                    TokenStream::Fallback(<span class="kw">_</span>) =&gt; mismatch(<span class="macro">line!</span>()),
                }));
                TokenStream::Compiler(first)
            }
            <span class="prelude-val">Some</span>(TokenStream::Fallback(<span class="kw-2">mut </span>first)) =&gt; {
                first.extend(streams.map(|s| <span class="kw">match </span>s {
                    TokenStream::Fallback(s) =&gt; s,
                    TokenStream::Compiler(<span class="kw">_</span>) =&gt; mismatch(<span class="macro">line!</span>()),
                }));
                TokenStream::Fallback(first)
            }
            <span class="prelude-val">None </span>=&gt; TokenStream::new(),
        }
    }
}

<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>, stream: I) {
        <span class="kw">match </span><span class="self">self </span>{
            TokenStream::Compiler(tts) =&gt; {
                <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) =&gt; tts.extend(stream),
        }
    }
}

<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="kw">match </span><span class="self">self </span>{
            TokenStream::Compiler(tts) =&gt; {
                tts.evaluate_now();
                tts.stream
                    .extend(streams.into_iter().map(TokenStream::unwrap_nightly));
            }
            TokenStream::Fallback(tts) =&gt; {
                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">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self </span>{
            TokenStream::Compiler(tts) =&gt; Debug::fmt(<span class="kw-2">&amp;</span>tts.clone().into_token_stream(), f),
            TokenStream::Fallback(tts) =&gt; 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">&amp;</span><span class="self">self</span>) -&gt; Span {
        <span class="kw">match </span><span class="self">self </span>{
            LexError::Compiler(<span class="kw">_</span>) | LexError::CompilerPanic =&gt; Span::call_site(),
            LexError::Fallback(e) =&gt; Span::Fallback(e.span()),
        }
    }
}

<span class="kw">impl </span>From&lt;proc_macro::LexError&gt; <span class="kw">for </span>LexError {
    <span class="kw">fn </span>from(e: proc_macro::LexError) -&gt; <span class="self">Self </span>{
        LexError::Compiler(e)
    }
}

<span class="kw">impl </span>From&lt;fallback::LexError&gt; <span class="kw">for </span>LexError {
    <span class="kw">fn </span>from(e: fallback::LexError) -&gt; <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">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self </span>{
            LexError::Compiler(e) =&gt; Debug::fmt(e, f),
            LexError::Fallback(e) =&gt; Debug::fmt(e, f),
            LexError::CompilerPanic =&gt; {
                <span class="kw">let </span>fallback = fallback::LexError::call_site();
                Debug::fmt(<span class="kw-2">&amp;</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">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self </span>{
            LexError::Compiler(e) =&gt; Display::fmt(e, f),
            LexError::Fallback(e) =&gt; Display::fmt(e, f),
            LexError::CompilerPanic =&gt; {
                <span class="kw">let </span>fallback = fallback::LexError::call_site();
                Display::fmt(<span class="kw-2">&amp;</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>) -&gt; TokenTreeIter {
        <span class="kw">match </span><span class="self">self </span>{
            TokenStream::Compiler(tts) =&gt; {
                TokenTreeIter::Compiler(tts.into_token_stream().into_iter())
            }
            TokenStream::Fallback(tts) =&gt; 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">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;TokenTree&gt; {
        <span class="kw">let </span>token = <span class="kw">match </span><span class="self">self </span>{
            TokenTreeIter::Compiler(iter) =&gt; iter.next()<span class="question-mark">?</span>,
            TokenTreeIter::Fallback(iter) =&gt; <span class="kw">return </span>iter.next(),
        };
        <span class="prelude-val">Some</span>(<span class="kw">match </span>token {
            proc_macro::TokenTree::Group(tt) =&gt; {
                TokenTree::Group(<span class="kw">crate</span>::Group::_new(Group::Compiler(tt)))
            }
            proc_macro::TokenTree::Punct(tt) =&gt; {
                <span class="kw">let </span>spacing = <span class="kw">match </span>tt.spacing() {
                    proc_macro::Spacing::Joint =&gt; Spacing::Joint,
                    proc_macro::Spacing::Alone =&gt; 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) =&gt; {
                TokenTree::Ident(<span class="kw">crate</span>::Ident::_new(Ident::Compiler(s)))
            }
            proc_macro::TokenTree::Literal(l) =&gt; {
                TokenTree::Literal(<span class="kw">crate</span>::Literal::_new(Literal::Compiler(l)))
            }
        })
    }

    <span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
        <span class="kw">match </span><span class="self">self </span>{
            TokenTreeIter::Compiler(tts) =&gt; tts.size_hint(),
            TokenTreeIter::Fallback(tts) =&gt; 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) -&gt; <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">&amp;</span><span class="self">self</span>) -&gt; PathBuf {
        <span class="kw">match </span><span class="self">self </span>{
            SourceFile::Compiler(a) =&gt; a.path(),
            SourceFile::Fallback(a) =&gt; a.path(),
        }
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_real(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
        <span class="kw">match </span><span class="self">self </span>{
            SourceFile::Compiler(a) =&gt; a.is_real(),
            SourceFile::Fallback(a) =&gt; 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">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self </span>{
            SourceFile::Compiler(a) =&gt; Debug::fmt(a, f),
            SourceFile::Fallback(a) =&gt; 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() -&gt; <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() -&gt; <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() -&gt; <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">&amp;</span><span class="self">self</span>, other: Span) -&gt; Span {
        <span class="kw">match </span>(<span class="self">self</span>, other) {
            (Span::Compiler(a), Span::Compiler(b)) =&gt; Span::Compiler(a.resolved_at(b)),
            (Span::Fallback(a), Span::Fallback(b)) =&gt; Span::Fallback(a.resolved_at(b)),
            (Span::Compiler(<span class="kw">_</span>), Span::Fallback(<span class="kw">_</span>)) =&gt; mismatch(<span class="macro">line!</span>()),
            (Span::Fallback(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) =&gt; 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">&amp;</span><span class="self">self</span>, other: Span) -&gt; Span {
        <span class="kw">match </span>(<span class="self">self</span>, other) {
            (Span::Compiler(a), Span::Compiler(b)) =&gt; Span::Compiler(a.located_at(b)),
            (Span::Fallback(a), Span::Fallback(b)) =&gt; Span::Fallback(a.located_at(b)),
            (Span::Compiler(<span class="kw">_</span>), Span::Fallback(<span class="kw">_</span>)) =&gt; mismatch(<span class="macro">line!</span>()),
            (Span::Fallback(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) =&gt; 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>) -&gt; proc_macro::Span {
        <span class="kw">match </span><span class="self">self </span>{
            Span::Compiler(s) =&gt; s,
            Span::Fallback(<span class="kw">_</span>) =&gt; <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">&amp;</span><span class="self">self</span>) -&gt; SourceFile {
        <span class="kw">match </span><span class="self">self </span>{
            Span::Compiler(s) =&gt; SourceFile::nightly(s.source_file()),
            Span::Fallback(s) =&gt; 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">&amp;</span><span class="self">self</span>) -&gt; Range&lt;usize&gt; {
        <span class="kw">match </span><span class="self">self </span>{
            <span class="attr">#[cfg(proc_macro_span)]
            </span>Span::Compiler(s) =&gt; s.byte_range(),
            <span class="attr">#[cfg(not(proc_macro_span))]
            </span>Span::Compiler(<span class="kw">_</span>) =&gt; <span class="number">0</span>..<span class="number">0</span>,
            Span::Fallback(s) =&gt; 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">&amp;</span><span class="self">self</span>) -&gt; LineColumn {
        <span class="kw">match </span><span class="self">self </span>{
            <span class="attr">#[cfg(proc_macro_span)]
            </span>Span::Compiler(s) =&gt; 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>) =&gt; LineColumn { line: <span class="number">0</span>, column: <span class="number">0 </span>},
            Span::Fallback(s) =&gt; 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">&amp;</span><span class="self">self</span>) -&gt; LineColumn {
        <span class="kw">match </span><span class="self">self </span>{
            <span class="attr">#[cfg(proc_macro_span)]
            </span>Span::Compiler(s) =&gt; {
                <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>) =&gt; LineColumn { line: <span class="number">0</span>, column: <span class="number">0 </span>},
            Span::Fallback(s) =&gt; s.end(),
        }
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">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="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)) =&gt; Span::Compiler(a.join(b)<span class="question-mark">?</span>),
            (Span::Fallback(a), Span::Fallback(b)) =&gt; Span::Fallback(a.join(b)<span class="question-mark">?</span>),
            <span class="kw">_ </span>=&gt; <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">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Span) -&gt; bool {
        <span class="kw">match </span>(<span class="self">self</span>, other) {
            (Span::Compiler(a), Span::Compiler(b)) =&gt; a.eq(b),
            (Span::Fallback(a), Span::Fallback(b)) =&gt; a.eq(b),
            <span class="kw">_ </span>=&gt; <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">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;String&gt; {
        <span class="kw">match </span><span class="self">self </span>{
            <span class="attr">#[cfg(not(no_source_text))]
            </span>Span::Compiler(s) =&gt; s.source_text(),
            <span class="attr">#[cfg(no_source_text)]
            </span>Span::Compiler(<span class="kw">_</span>) =&gt; <span class="prelude-val">None</span>,
            Span::Fallback(s) =&gt; s.source_text(),
        }
    }

    <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -&gt; proc_macro::Span {
        <span class="kw">match </span><span class="self">self </span>{
            Span::Compiler(s) =&gt; s,
            Span::Fallback(<span class="kw">_</span>) =&gt; mismatch(<span class="macro">line!</span>()),
        }
    }
}

<span class="kw">impl </span>From&lt;proc_macro::Span&gt; <span class="kw">for </span><span class="kw">crate</span>::Span {
    <span class="kw">fn </span>from(proc_span: proc_macro::Span) -&gt; <span class="self">Self </span>{
        <span class="kw">crate</span>::Span::_new(Span::Compiler(proc_span))
    }
}

<span class="kw">impl </span>From&lt;fallback::Span&gt; <span class="kw">for </span>Span {
    <span class="kw">fn </span>from(inner: fallback::Span) -&gt; <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">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self </span>{
            Span::Compiler(s) =&gt; Debug::fmt(s, f),
            Span::Fallback(s) =&gt; 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">&amp;mut </span>fmt::DebugStruct, span: Span) {
    <span class="kw">match </span>span {
        Span::Compiler(s) =&gt; {
            debug.field(<span class="string">"span"</span>, <span class="kw-2">&amp;</span>s);
        }
        Span::Fallback(s) =&gt; 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) -&gt; <span class="self">Self </span>{
        <span class="kw">match </span>stream {
            TokenStream::Compiler(tts) =&gt; {
                <span class="kw">let </span>delimiter = <span class="kw">match </span>delimiter {
                    Delimiter::Parenthesis =&gt; proc_macro::Delimiter::Parenthesis,
                    Delimiter::Bracket =&gt; proc_macro::Delimiter::Bracket,
                    Delimiter::Brace =&gt; proc_macro::Delimiter::Brace,
                    Delimiter::None =&gt; proc_macro::Delimiter::None,
                };
                Group::Compiler(proc_macro::Group::new(delimiter, tts.into_token_stream()))
            }
            TokenStream::Fallback(stream) =&gt; {
                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">&amp;</span><span class="self">self</span>) -&gt; Delimiter {
        <span class="kw">match </span><span class="self">self </span>{
            Group::Compiler(g) =&gt; <span class="kw">match </span>g.delimiter() {
                proc_macro::Delimiter::Parenthesis =&gt; Delimiter::Parenthesis,
                proc_macro::Delimiter::Bracket =&gt; Delimiter::Bracket,
                proc_macro::Delimiter::Brace =&gt; Delimiter::Brace,
                proc_macro::Delimiter::None =&gt; Delimiter::None,
            },
            Group::Fallback(g) =&gt; g.delimiter(),
        }
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>stream(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
        <span class="kw">match </span><span class="self">self </span>{
            Group::Compiler(g) =&gt; TokenStream::Compiler(DeferredTokenStream::new(g.stream())),
            Group::Fallback(g) =&gt; TokenStream::Fallback(g.stream()),
        }
    }

    <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="kw">match </span><span class="self">self </span>{
            Group::Compiler(g) =&gt; Span::Compiler(g.span()),
            Group::Fallback(g) =&gt; 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">&amp;</span><span class="self">self</span>) -&gt; Span {
        <span class="kw">match </span><span class="self">self </span>{
            Group::Compiler(g) =&gt; Span::Compiler(g.span_open()),
            Group::Fallback(g) =&gt; 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">&amp;</span><span class="self">self</span>) -&gt; Span {
        <span class="kw">match </span><span class="self">self </span>{
            Group::Compiler(g) =&gt; Span::Compiler(g.span_close()),
            Group::Fallback(g) =&gt; 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">&amp;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)) =&gt; g.set_span(s),
            (Group::Fallback(g), Span::Fallback(s)) =&gt; g.set_span(s),
            (Group::Compiler(<span class="kw">_</span>), Span::Fallback(<span class="kw">_</span>)) =&gt; mismatch(<span class="macro">line!</span>()),
            (Group::Fallback(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) =&gt; mismatch(<span class="macro">line!</span>()),
        }
    }

    <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -&gt; proc_macro::Group {
        <span class="kw">match </span><span class="self">self </span>{
            Group::Compiler(g) =&gt; g,
            Group::Fallback(<span class="kw">_</span>) =&gt; mismatch(<span class="macro">line!</span>()),
        }
    }
}

<span class="kw">impl </span>From&lt;fallback::Group&gt; <span class="kw">for </span>Group {
    <span class="kw">fn </span>from(g: fallback::Group) -&gt; <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">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self </span>{
            Group::Compiler(group) =&gt; Display::fmt(group, formatter),
            Group::Fallback(group) =&gt; 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">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self </span>{
            Group::Compiler(group) =&gt; Debug::fmt(group, formatter),
            Group::Fallback(group) =&gt; 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">&amp;</span>str, span: Span) -&gt; <span class="self">Self </span>{
        <span class="kw">match </span>span {
            Span::Compiler(s) =&gt; Ident::Compiler(proc_macro::Ident::new(string, s)),
            Span::Fallback(s) =&gt; 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">&amp;</span>str, span: Span) -&gt; <span class="self">Self </span>{
        <span class="kw">match </span>span {
            Span::Compiler(s) =&gt; Ident::Compiler(proc_macro::Ident::new_raw(string, s)),
            Span::Fallback(s) =&gt; 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">&amp;</span><span class="self">self</span>) -&gt; Span {
        <span class="kw">match </span><span class="self">self </span>{
            Ident::Compiler(t) =&gt; Span::Compiler(t.span()),
            Ident::Fallback(t) =&gt; 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">&amp;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)) =&gt; t.set_span(s),
            (Ident::Fallback(t), Span::Fallback(s)) =&gt; t.set_span(s),
            (Ident::Compiler(<span class="kw">_</span>), Span::Fallback(<span class="kw">_</span>)) =&gt; mismatch(<span class="macro">line!</span>()),
            (Ident::Fallback(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) =&gt; mismatch(<span class="macro">line!</span>()),
        }
    }

    <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -&gt; proc_macro::Ident {
        <span class="kw">match </span><span class="self">self </span>{
            Ident::Compiler(s) =&gt; s,
            Ident::Fallback(<span class="kw">_</span>) =&gt; mismatch(<span class="macro">line!</span>()),
        }
    }
}

<span class="kw">impl </span>From&lt;fallback::Ident&gt; <span class="kw">for </span>Ident {
    <span class="kw">fn </span>from(inner: fallback::Ident) -&gt; <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">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Ident) -&gt; bool {
        <span class="kw">match </span>(<span class="self">self</span>, other) {
            (Ident::Compiler(t), Ident::Compiler(o)) =&gt; t.to_string() == o.to_string(),
            (Ident::Fallback(t), Ident::Fallback(o)) =&gt; t == o,
            (Ident::Compiler(<span class="kw">_</span>), Ident::Fallback(<span class="kw">_</span>)) =&gt; mismatch(<span class="macro">line!</span>()),
            (Ident::Fallback(<span class="kw">_</span>), Ident::Compiler(<span class="kw">_</span>)) =&gt; mismatch(<span class="macro">line!</span>()),
        }
    }
}

<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">match </span><span class="self">self </span>{
            Ident::Compiler(t) =&gt; t.to_string() == other,
            Ident::Fallback(t) =&gt; t == 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">match </span><span class="self">self </span>{
            Ident::Compiler(t) =&gt; Display::fmt(t, f),
            Ident::Fallback(t) =&gt; 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">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self </span>{
            Ident::Compiler(t) =&gt; Debug::fmt(t, f),
            Ident::Fallback(t) =&gt; 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 =&gt; <span class="macro-nonterminal">$kind</span>:ident,)<span class="kw-2">*</span>) =&gt; ($(
        <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>) -&gt; 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 =&gt; <span class="macro-nonterminal">$kind</span>:ident,)<span class="kw-2">*</span>) =&gt; ($(
        <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>) -&gt; 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">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, LexError&gt; {
        <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">&amp;</span>str) -&gt; <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 =&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_integers!</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</span>(<span class="kw">crate</span>) <span class="kw">fn </span>f32_unsuffixed(f: f32) -&gt; 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) -&gt; 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">&amp;</span>str) -&gt; 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) -&gt; 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) -&gt; 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">&amp;</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">&amp;</span>[u8]) -&gt; 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">&amp;</span>CStr) -&gt; 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">&amp;</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">&amp;</span><span class="self">self</span>) -&gt; Span {
        <span class="kw">match </span><span class="self">self </span>{
            Literal::Compiler(lit) =&gt; Span::Compiler(lit.span()),
            Literal::Fallback(lit) =&gt; 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">&amp;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)) =&gt; lit.set_span(s),
            (Literal::Fallback(lit), Span::Fallback(s)) =&gt; lit.set_span(s),
            (Literal::Compiler(<span class="kw">_</span>), Span::Fallback(<span class="kw">_</span>)) =&gt; mismatch(<span class="macro">line!</span>()),
            (Literal::Fallback(<span class="kw">_</span>), Span::Compiler(<span class="kw">_</span>)) =&gt; mismatch(<span class="macro">line!</span>()),
        }
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">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="kw">match </span><span class="self">self </span>{
            <span class="attr">#[cfg(proc_macro_span)]
            </span>Literal::Compiler(lit) =&gt; lit.subspan(range).map(Span::Compiler),
            <span class="attr">#[cfg(not(proc_macro_span))]
            </span>Literal::Compiler(_lit) =&gt; <span class="prelude-val">None</span>,
            Literal::Fallback(lit) =&gt; lit.subspan(range).map(Span::Fallback),
        }
    }

    <span class="kw">fn </span>unwrap_nightly(<span class="self">self</span>) -&gt; proc_macro::Literal {
        <span class="kw">match </span><span class="self">self </span>{
            Literal::Compiler(s) =&gt; s,
            Literal::Fallback(<span class="kw">_</span>) =&gt; mismatch(<span class="macro">line!</span>()),
        }
    }
}

<span class="kw">impl </span>From&lt;fallback::Literal&gt; <span class="kw">for </span>Literal {
    <span class="kw">fn </span>from(s: fallback::Literal) -&gt; <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">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self </span>{
            Literal::Compiler(t) =&gt; Display::fmt(t, f),
            Literal::Fallback(t) =&gt; 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">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self </span>{
            Literal::Compiler(t) =&gt; Debug::fmt(t, f),
            Literal::Fallback(t) =&gt; 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>