api-docs/crates-enclave/src/tracing_core/metadata.rs.html - incubator-teaclave-website - Git at Google

 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/tracing-core-0.1.31/src/metadata.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>metadata.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../tracing_core/index.html"><div class="logo-container">
                     <img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../tracing_core/index.html">
                         <img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
 <span id="2">2</span>
 <span id="3">3</span>
 <span id="4">4</span>
 <span id="5">5</span>
 <span id="6">6</span>
 <span id="7">7</span>
 <span id="8">8</span>
 <span id="9">9</span>
 <span id="10">10</span>
 <span id="11">11</span>
 <span id="12">12</span>
 <span id="13">13</span>
 <span id="14">14</span>
 <span id="15">15</span>
 <span id="16">16</span>
 <span id="17">17</span>
 <span id="18">18</span>
 <span id="19">19</span>
 <span id="20">20</span>
 <span id="21">21</span>
 <span id="22">22</span>
 <span id="23">23</span>
 <span id="24">24</span>
 <span id="25">25</span>
 <span id="26">26</span>
 <span id="27">27</span>
 <span id="28">28</span>
 <span id="29">29</span>
 <span id="30">30</span>
 <span id="31">31</span>
 <span id="32">32</span>
 <span id="33">33</span>
 <span id="34">34</span>
 <span id="35">35</span>
 <span id="36">36</span>
 <span id="37">37</span>
 <span id="38">38</span>
 <span id="39">39</span>
 <span id="40">40</span>
 <span id="41">41</span>
 <span id="42">42</span>
 <span id="43">43</span>
 <span id="44">44</span>
 <span id="45">45</span>
 <span id="46">46</span>
 <span id="47">47</span>
 <span id="48">48</span>
 <span id="49">49</span>
 <span id="50">50</span>
 <span id="51">51</span>
 <span id="52">52</span>
 <span id="53">53</span>
 <span id="54">54</span>
 <span id="55">55</span>
 <span id="56">56</span>
 <span id="57">57</span>
 <span id="58">58</span>
 <span id="59">59</span>
 <span id="60">60</span>
 <span id="61">61</span>
 <span id="62">62</span>
 <span id="63">63</span>
 <span id="64">64</span>
 <span id="65">65</span>
 <span id="66">66</span>
 <span id="67">67</span>
 <span id="68">68</span>
 <span id="69">69</span>
 <span id="70">70</span>
 <span id="71">71</span>
 <span id="72">72</span>
 <span id="73">73</span>
 <span id="74">74</span>
 <span id="75">75</span>
 <span id="76">76</span>
 <span id="77">77</span>
 <span id="78">78</span>
 <span id="79">79</span>
 <span id="80">80</span>
 <span id="81">81</span>
 <span id="82">82</span>
 <span id="83">83</span>
 <span id="84">84</span>
 <span id="85">85</span>
 <span id="86">86</span>
 <span id="87">87</span>
 <span id="88">88</span>
 <span id="89">89</span>
 <span id="90">90</span>
 <span id="91">91</span>
 <span id="92">92</span>
 <span id="93">93</span>
 <span id="94">94</span>
 <span id="95">95</span>
 <span id="96">96</span>
 <span id="97">97</span>
 <span id="98">98</span>
 <span id="99">99</span>
 <span id="100">100</span>
 <span id="101">101</span>
 <span id="102">102</span>
 <span id="103">103</span>
 <span id="104">104</span>
 <span id="105">105</span>
 <span id="106">106</span>
 <span id="107">107</span>
 <span id="108">108</span>
 <span id="109">109</span>
 <span id="110">110</span>
 <span id="111">111</span>
 <span id="112">112</span>
 <span id="113">113</span>
 <span id="114">114</span>
 <span id="115">115</span>
 <span id="116">116</span>
 <span id="117">117</span>
 <span id="118">118</span>
 <span id="119">119</span>
 <span id="120">120</span>
 <span id="121">121</span>
 <span id="122">122</span>
 <span id="123">123</span>
 <span id="124">124</span>
 <span id="125">125</span>
 <span id="126">126</span>
 <span id="127">127</span>
 <span id="128">128</span>
 <span id="129">129</span>
 <span id="130">130</span>
 <span id="131">131</span>
 <span id="132">132</span>
 <span id="133">133</span>
 <span id="134">134</span>
 <span id="135">135</span>
 <span id="136">136</span>
 <span id="137">137</span>
 <span id="138">138</span>
 <span id="139">139</span>
 <span id="140">140</span>
 <span id="141">141</span>
 <span id="142">142</span>
 <span id="143">143</span>
 <span id="144">144</span>
 <span id="145">145</span>
 <span id="146">146</span>
 <span id="147">147</span>
 <span id="148">148</span>
 <span id="149">149</span>
 <span id="150">150</span>
 <span id="151">151</span>
 <span id="152">152</span>
 <span id="153">153</span>
 <span id="154">154</span>
 <span id="155">155</span>
 <span id="156">156</span>
 <span id="157">157</span>
 <span id="158">158</span>
 <span id="159">159</span>
 <span id="160">160</span>
 <span id="161">161</span>
 <span id="162">162</span>
 <span id="163">163</span>
 <span id="164">164</span>
 <span id="165">165</span>
 <span id="166">166</span>
 <span id="167">167</span>
 <span id="168">168</span>
 <span id="169">169</span>
 <span id="170">170</span>
 <span id="171">171</span>
 <span id="172">172</span>
 <span id="173">173</span>
 <span id="174">174</span>
 <span id="175">175</span>
 <span id="176">176</span>
 <span id="177">177</span>
 <span id="178">178</span>
 <span id="179">179</span>
 <span id="180">180</span>
 <span id="181">181</span>
 <span id="182">182</span>
 <span id="183">183</span>
 <span id="184">184</span>
 <span id="185">185</span>
 <span id="186">186</span>
 <span id="187">187</span>
 <span id="188">188</span>
 <span id="189">189</span>
 <span id="190">190</span>
 <span id="191">191</span>
 <span id="192">192</span>
 <span id="193">193</span>
 <span id="194">194</span>
 <span id="195">195</span>
 <span id="196">196</span>
 <span id="197">197</span>
 <span id="198">198</span>
 <span id="199">199</span>
 <span id="200">200</span>
 <span id="201">201</span>
 <span id="202">202</span>
 <span id="203">203</span>
 <span id="204">204</span>
 <span id="205">205</span>
 <span id="206">206</span>
 <span id="207">207</span>
 <span id="208">208</span>
 <span id="209">209</span>
 <span id="210">210</span>
 <span id="211">211</span>
 <span id="212">212</span>
 <span id="213">213</span>
 <span id="214">214</span>
 <span id="215">215</span>
 <span id="216">216</span>
 <span id="217">217</span>
 <span id="218">218</span>
 <span id="219">219</span>
 <span id="220">220</span>
 <span id="221">221</span>
 <span id="222">222</span>
 <span id="223">223</span>
 <span id="224">224</span>
 <span id="225">225</span>
 <span id="226">226</span>
 <span id="227">227</span>
 <span id="228">228</span>
 <span id="229">229</span>
 <span id="230">230</span>
 <span id="231">231</span>
 <span id="232">232</span>
 <span id="233">233</span>
 <span id="234">234</span>
 <span id="235">235</span>
 <span id="236">236</span>
 <span id="237">237</span>
 <span id="238">238</span>
 <span id="239">239</span>
 <span id="240">240</span>
 <span id="241">241</span>
 <span id="242">242</span>
 <span id="243">243</span>
 <span id="244">244</span>
 <span id="245">245</span>
 <span id="246">246</span>
 <span id="247">247</span>
 <span id="248">248</span>
 <span id="249">249</span>
 <span id="250">250</span>
 <span id="251">251</span>
 <span id="252">252</span>
 <span id="253">253</span>
 <span id="254">254</span>
 <span id="255">255</span>
 <span id="256">256</span>
 <span id="257">257</span>
 <span id="258">258</span>
 <span id="259">259</span>
 <span id="260">260</span>
 <span id="261">261</span>
 <span id="262">262</span>
 <span id="263">263</span>
 <span id="264">264</span>
 <span id="265">265</span>
 <span id="266">266</span>
 <span id="267">267</span>
 <span id="268">268</span>
 <span id="269">269</span>
 <span id="270">270</span>
 <span id="271">271</span>
 <span id="272">272</span>
 <span id="273">273</span>
 <span id="274">274</span>
 <span id="275">275</span>
 <span id="276">276</span>
 <span id="277">277</span>
 <span id="278">278</span>
 <span id="279">279</span>
 <span id="280">280</span>
 <span id="281">281</span>
 <span id="282">282</span>
 <span id="283">283</span>
 <span id="284">284</span>
 <span id="285">285</span>
 <span id="286">286</span>
 <span id="287">287</span>
 <span id="288">288</span>
 <span id="289">289</span>
 <span id="290">290</span>
 <span id="291">291</span>
 <span id="292">292</span>
 <span id="293">293</span>
 <span id="294">294</span>
 <span id="295">295</span>
 <span id="296">296</span>
 <span id="297">297</span>
 <span id="298">298</span>
 <span id="299">299</span>
 <span id="300">300</span>
 <span id="301">301</span>
 <span id="302">302</span>
 <span id="303">303</span>
 <span id="304">304</span>
 <span id="305">305</span>
 <span id="306">306</span>
 <span id="307">307</span>
 <span id="308">308</span>
 <span id="309">309</span>
 <span id="310">310</span>
 <span id="311">311</span>
 <span id="312">312</span>
 <span id="313">313</span>
 <span id="314">314</span>
 <span id="315">315</span>
 <span id="316">316</span>
 <span id="317">317</span>
 <span id="318">318</span>
 <span id="319">319</span>
 <span id="320">320</span>
 <span id="321">321</span>
 <span id="322">322</span>
 <span id="323">323</span>
 <span id="324">324</span>
 <span id="325">325</span>
 <span id="326">326</span>
 <span id="327">327</span>
 <span id="328">328</span>
 <span id="329">329</span>
 <span id="330">330</span>
 <span id="331">331</span>
 <span id="332">332</span>
 <span id="333">333</span>
 <span id="334">334</span>
 <span id="335">335</span>
 <span id="336">336</span>
 <span id="337">337</span>
 <span id="338">338</span>
 <span id="339">339</span>
 <span id="340">340</span>
 <span id="341">341</span>
 <span id="342">342</span>
 <span id="343">343</span>
 <span id="344">344</span>
 <span id="345">345</span>
 <span id="346">346</span>
 <span id="347">347</span>
 <span id="348">348</span>
 <span id="349">349</span>
 <span id="350">350</span>
 <span id="351">351</span>
 <span id="352">352</span>
 <span id="353">353</span>
 <span id="354">354</span>
 <span id="355">355</span>
 <span id="356">356</span>
 <span id="357">357</span>
 <span id="358">358</span>
 <span id="359">359</span>
 <span id="360">360</span>
 <span id="361">361</span>
 <span id="362">362</span>
 <span id="363">363</span>
 <span id="364">364</span>
 <span id="365">365</span>
 <span id="366">366</span>
 <span id="367">367</span>
 <span id="368">368</span>
 <span id="369">369</span>
 <span id="370">370</span>
 <span id="371">371</span>
 <span id="372">372</span>
 <span id="373">373</span>
 <span id="374">374</span>
 <span id="375">375</span>
 <span id="376">376</span>
 <span id="377">377</span>
 <span id="378">378</span>
 <span id="379">379</span>
 <span id="380">380</span>
 <span id="381">381</span>
 <span id="382">382</span>
 <span id="383">383</span>
 <span id="384">384</span>
 <span id="385">385</span>
 <span id="386">386</span>
 <span id="387">387</span>
 <span id="388">388</span>
 <span id="389">389</span>
 <span id="390">390</span>
 <span id="391">391</span>
 <span id="392">392</span>
 <span id="393">393</span>
 <span id="394">394</span>
 <span id="395">395</span>
 <span id="396">396</span>
 <span id="397">397</span>
 <span id="398">398</span>
 <span id="399">399</span>
 <span id="400">400</span>
 <span id="401">401</span>
 <span id="402">402</span>
 <span id="403">403</span>
 <span id="404">404</span>
 <span id="405">405</span>
 <span id="406">406</span>
 <span id="407">407</span>
 <span id="408">408</span>
 <span id="409">409</span>
 <span id="410">410</span>
 <span id="411">411</span>
 <span id="412">412</span>
 <span id="413">413</span>
 <span id="414">414</span>
 <span id="415">415</span>
 <span id="416">416</span>
 <span id="417">417</span>
 <span id="418">418</span>
 <span id="419">419</span>
 <span id="420">420</span>
 <span id="421">421</span>
 <span id="422">422</span>
 <span id="423">423</span>
 <span id="424">424</span>
 <span id="425">425</span>
 <span id="426">426</span>
 <span id="427">427</span>
 <span id="428">428</span>
 <span id="429">429</span>
 <span id="430">430</span>
 <span id="431">431</span>
 <span id="432">432</span>
 <span id="433">433</span>
 <span id="434">434</span>
 <span id="435">435</span>
 <span id="436">436</span>
 <span id="437">437</span>
 <span id="438">438</span>
 <span id="439">439</span>
 <span id="440">440</span>
 <span id="441">441</span>
 <span id="442">442</span>
 <span id="443">443</span>
 <span id="444">444</span>
 <span id="445">445</span>
 <span id="446">446</span>
 <span id="447">447</span>
 <span id="448">448</span>
 <span id="449">449</span>
 <span id="450">450</span>
 <span id="451">451</span>
 <span id="452">452</span>
 <span id="453">453</span>
 <span id="454">454</span>
 <span id="455">455</span>
 <span id="456">456</span>
 <span id="457">457</span>
 <span id="458">458</span>
 <span id="459">459</span>
 <span id="460">460</span>
 <span id="461">461</span>
 <span id="462">462</span>
 <span id="463">463</span>
 <span id="464">464</span>
 <span id="465">465</span>
 <span id="466">466</span>
 <span id="467">467</span>
 <span id="468">468</span>
 <span id="469">469</span>
 <span id="470">470</span>
 <span id="471">471</span>
 <span id="472">472</span>
 <span id="473">473</span>
 <span id="474">474</span>
 <span id="475">475</span>
 <span id="476">476</span>
 <span id="477">477</span>
 <span id="478">478</span>
 <span id="479">479</span>
 <span id="480">480</span>
 <span id="481">481</span>
 <span id="482">482</span>
 <span id="483">483</span>
 <span id="484">484</span>
 <span id="485">485</span>
 <span id="486">486</span>
 <span id="487">487</span>
 <span id="488">488</span>
 <span id="489">489</span>
 <span id="490">490</span>
 <span id="491">491</span>
 <span id="492">492</span>
 <span id="493">493</span>
 <span id="494">494</span>
 <span id="495">495</span>
 <span id="496">496</span>
 <span id="497">497</span>
 <span id="498">498</span>
 <span id="499">499</span>
 <span id="500">500</span>
 <span id="501">501</span>
 <span id="502">502</span>
 <span id="503">503</span>
 <span id="504">504</span>
 <span id="505">505</span>
 <span id="506">506</span>
 <span id="507">507</span>
 <span id="508">508</span>
 <span id="509">509</span>
 <span id="510">510</span>
 <span id="511">511</span>
 <span id="512">512</span>
 <span id="513">513</span>
 <span id="514">514</span>
 <span id="515">515</span>
 <span id="516">516</span>
 <span id="517">517</span>
 <span id="518">518</span>
 <span id="519">519</span>
 <span id="520">520</span>
 <span id="521">521</span>
 <span id="522">522</span>
 <span id="523">523</span>
 <span id="524">524</span>
 <span id="525">525</span>
 <span id="526">526</span>
 <span id="527">527</span>
 <span id="528">528</span>
 <span id="529">529</span>
 <span id="530">530</span>
 <span id="531">531</span>
 <span id="532">532</span>
 <span id="533">533</span>
 <span id="534">534</span>
 <span id="535">535</span>
 <span id="536">536</span>
 <span id="537">537</span>
 <span id="538">538</span>
 <span id="539">539</span>
 <span id="540">540</span>
 <span id="541">541</span>
 <span id="542">542</span>
 <span id="543">543</span>
 <span id="544">544</span>
 <span id="545">545</span>
 <span id="546">546</span>
 <span id="547">547</span>
 <span id="548">548</span>
 <span id="549">549</span>
 <span id="550">550</span>
 <span id="551">551</span>
 <span id="552">552</span>
 <span id="553">553</span>
 <span id="554">554</span>
 <span id="555">555</span>
 <span id="556">556</span>
 <span id="557">557</span>
 <span id="558">558</span>
 <span id="559">559</span>
 <span id="560">560</span>
 <span id="561">561</span>
 <span id="562">562</span>
 <span id="563">563</span>
 <span id="564">564</span>
 <span id="565">565</span>
 <span id="566">566</span>
 <span id="567">567</span>
 <span id="568">568</span>
 <span id="569">569</span>
 <span id="570">570</span>
 <span id="571">571</span>
 <span id="572">572</span>
 <span id="573">573</span>
 <span id="574">574</span>
 <span id="575">575</span>
 <span id="576">576</span>
 <span id="577">577</span>
 <span id="578">578</span>
 <span id="579">579</span>
 <span id="580">580</span>
 <span id="581">581</span>
 <span id="582">582</span>
 <span id="583">583</span>
 <span id="584">584</span>
 <span id="585">585</span>
 <span id="586">586</span>
 <span id="587">587</span>
 <span id="588">588</span>
 <span id="589">589</span>
 <span id="590">590</span>
 <span id="591">591</span>
 <span id="592">592</span>
 <span id="593">593</span>
 <span id="594">594</span>
 <span id="595">595</span>
 <span id="596">596</span>
 <span id="597">597</span>
 <span id="598">598</span>
 <span id="599">599</span>
 <span id="600">600</span>
 <span id="601">601</span>
 <span id="602">602</span>
 <span id="603">603</span>
 <span id="604">604</span>
 <span id="605">605</span>
 <span id="606">606</span>
 <span id="607">607</span>
 <span id="608">608</span>
 <span id="609">609</span>
 <span id="610">610</span>
 <span id="611">611</span>
 <span id="612">612</span>
 <span id="613">613</span>
 <span id="614">614</span>
 <span id="615">615</span>
 <span id="616">616</span>
 <span id="617">617</span>
 <span id="618">618</span>
 <span id="619">619</span>
 <span id="620">620</span>
 <span id="621">621</span>
 <span id="622">622</span>
 <span id="623">623</span>
 <span id="624">624</span>
 <span id="625">625</span>
 <span id="626">626</span>
 <span id="627">627</span>
 <span id="628">628</span>
 <span id="629">629</span>
 <span id="630">630</span>
 <span id="631">631</span>
 <span id="632">632</span>
 <span id="633">633</span>
 <span id="634">634</span>
 <span id="635">635</span>
 <span id="636">636</span>
 <span id="637">637</span>
 <span id="638">638</span>
 <span id="639">639</span>
 <span id="640">640</span>
 <span id="641">641</span>
 <span id="642">642</span>
 <span id="643">643</span>
 <span id="644">644</span>
 <span id="645">645</span>
 <span id="646">646</span>
 <span id="647">647</span>
 <span id="648">648</span>
 <span id="649">649</span>
 <span id="650">650</span>
 <span id="651">651</span>
 <span id="652">652</span>
 <span id="653">653</span>
 <span id="654">654</span>
 <span id="655">655</span>
 <span id="656">656</span>
 <span id="657">657</span>
 <span id="658">658</span>
 <span id="659">659</span>
 <span id="660">660</span>
 <span id="661">661</span>
 <span id="662">662</span>
 <span id="663">663</span>
 <span id="664">664</span>
 <span id="665">665</span>
 <span id="666">666</span>
 <span id="667">667</span>
 <span id="668">668</span>
 <span id="669">669</span>
 <span id="670">670</span>
 <span id="671">671</span>
 <span id="672">672</span>
 <span id="673">673</span>
 <span id="674">674</span>
 <span id="675">675</span>
 <span id="676">676</span>
 <span id="677">677</span>
 <span id="678">678</span>
 <span id="679">679</span>
 <span id="680">680</span>
 <span id="681">681</span>
 <span id="682">682</span>
 <span id="683">683</span>
 <span id="684">684</span>
 <span id="685">685</span>
 <span id="686">686</span>
 <span id="687">687</span>
 <span id="688">688</span>
 <span id="689">689</span>
 <span id="690">690</span>
 <span id="691">691</span>
 <span id="692">692</span>
 <span id="693">693</span>
 <span id="694">694</span>
 <span id="695">695</span>
 <span id="696">696</span>
 <span id="697">697</span>
 <span id="698">698</span>
 <span id="699">699</span>
 <span id="700">700</span>
 <span id="701">701</span>
 <span id="702">702</span>
 <span id="703">703</span>
 <span id="704">704</span>
 <span id="705">705</span>
 <span id="706">706</span>
 <span id="707">707</span>
 <span id="708">708</span>
 <span id="709">709</span>
 <span id="710">710</span>
 <span id="711">711</span>
 <span id="712">712</span>
 <span id="713">713</span>
 <span id="714">714</span>
 <span id="715">715</span>
 <span id="716">716</span>
 <span id="717">717</span>
 <span id="718">718</span>
 <span id="719">719</span>
 <span id="720">720</span>
 <span id="721">721</span>
 <span id="722">722</span>
 <span id="723">723</span>
 <span id="724">724</span>
 <span id="725">725</span>
 <span id="726">726</span>
 <span id="727">727</span>
 <span id="728">728</span>
 <span id="729">729</span>
 <span id="730">730</span>
 <span id="731">731</span>
 <span id="732">732</span>
 <span id="733">733</span>
 <span id="734">734</span>
 <span id="735">735</span>
 <span id="736">736</span>
 <span id="737">737</span>
 <span id="738">738</span>
 <span id="739">739</span>
 <span id="740">740</span>
 <span id="741">741</span>
 <span id="742">742</span>
 <span id="743">743</span>
 <span id="744">744</span>
 <span id="745">745</span>
 <span id="746">746</span>
 <span id="747">747</span>
 <span id="748">748</span>
 <span id="749">749</span>
 <span id="750">750</span>
 <span id="751">751</span>
 <span id="752">752</span>
 <span id="753">753</span>
 <span id="754">754</span>
 <span id="755">755</span>
 <span id="756">756</span>
 <span id="757">757</span>
 <span id="758">758</span>
 <span id="759">759</span>
 <span id="760">760</span>
 <span id="761">761</span>
 <span id="762">762</span>
 <span id="763">763</span>
 <span id="764">764</span>
 <span id="765">765</span>
 <span id="766">766</span>
 <span id="767">767</span>
 <span id="768">768</span>
 <span id="769">769</span>
 <span id="770">770</span>
 <span id="771">771</span>
 <span id="772">772</span>
 <span id="773">773</span>
 <span id="774">774</span>
 <span id="775">775</span>
 <span id="776">776</span>
 <span id="777">777</span>
 <span id="778">778</span>
 <span id="779">779</span>
 <span id="780">780</span>
 <span id="781">781</span>
 <span id="782">782</span>
 <span id="783">783</span>
 <span id="784">784</span>
 <span id="785">785</span>
 <span id="786">786</span>
 <span id="787">787</span>
 <span id="788">788</span>
 <span id="789">789</span>
 <span id="790">790</span>
 <span id="791">791</span>
 <span id="792">792</span>
 <span id="793">793</span>
 <span id="794">794</span>
 <span id="795">795</span>
 <span id="796">796</span>
 <span id="797">797</span>
 <span id="798">798</span>
 <span id="799">799</span>
 <span id="800">800</span>
 <span id="801">801</span>
 <span id="802">802</span>
 <span id="803">803</span>
 <span id="804">804</span>
 <span id="805">805</span>
 <span id="806">806</span>
 <span id="807">807</span>
 <span id="808">808</span>
 <span id="809">809</span>
 <span id="810">810</span>
 <span id="811">811</span>
 <span id="812">812</span>
 <span id="813">813</span>
 <span id="814">814</span>
 <span id="815">815</span>
 <span id="816">816</span>
 <span id="817">817</span>
 <span id="818">818</span>
 <span id="819">819</span>
 <span id="820">820</span>
 <span id="821">821</span>
 <span id="822">822</span>
 <span id="823">823</span>
 <span id="824">824</span>
 <span id="825">825</span>
 <span id="826">826</span>
 <span id="827">827</span>
 <span id="828">828</span>
 <span id="829">829</span>
 <span id="830">830</span>
 <span id="831">831</span>
 <span id="832">832</span>
 <span id="833">833</span>
 <span id="834">834</span>
 <span id="835">835</span>
 <span id="836">836</span>
 <span id="837">837</span>
 <span id="838">838</span>
 <span id="839">839</span>
 <span id="840">840</span>
 <span id="841">841</span>
 <span id="842">842</span>
 <span id="843">843</span>
 <span id="844">844</span>
 <span id="845">845</span>
 <span id="846">846</span>
 <span id="847">847</span>
 <span id="848">848</span>
 <span id="849">849</span>
 <span id="850">850</span>
 <span id="851">851</span>
 <span id="852">852</span>
 <span id="853">853</span>
 <span id="854">854</span>
 <span id="855">855</span>
 <span id="856">856</span>
 <span id="857">857</span>
 <span id="858">858</span>
 <span id="859">859</span>
 <span id="860">860</span>
 <span id="861">861</span>
 <span id="862">862</span>
 <span id="863">863</span>
 <span id="864">864</span>
 <span id="865">865</span>
 <span id="866">866</span>
 <span id="867">867</span>
 <span id="868">868</span>
 <span id="869">869</span>
 <span id="870">870</span>
 <span id="871">871</span>
 <span id="872">872</span>
 <span id="873">873</span>
 <span id="874">874</span>
 <span id="875">875</span>
 <span id="876">876</span>
 <span id="877">877</span>
 <span id="878">878</span>
 <span id="879">879</span>
 <span id="880">880</span>
 <span id="881">881</span>
 <span id="882">882</span>
 <span id="883">883</span>
 <span id="884">884</span>
 <span id="885">885</span>
 <span id="886">886</span>
 <span id="887">887</span>
 <span id="888">888</span>
 <span id="889">889</span>
 <span id="890">890</span>
 <span id="891">891</span>
 <span id="892">892</span>
 <span id="893">893</span>
 <span id="894">894</span>
 <span id="895">895</span>
 <span id="896">896</span>
 <span id="897">897</span>
 <span id="898">898</span>
 <span id="899">899</span>
 <span id="900">900</span>
 <span id="901">901</span>
 <span id="902">902</span>
 <span id="903">903</span>
 <span id="904">904</span>
 <span id="905">905</span>
 <span id="906">906</span>
 <span id="907">907</span>
 <span id="908">908</span>
 <span id="909">909</span>
 <span id="910">910</span>
 <span id="911">911</span>
 <span id="912">912</span>
 <span id="913">913</span>
 <span id="914">914</span>
 <span id="915">915</span>
 <span id="916">916</span>
 <span id="917">917</span>
 <span id="918">918</span>
 <span id="919">919</span>
 <span id="920">920</span>
 <span id="921">921</span>
 <span id="922">922</span>
 <span id="923">923</span>
 <span id="924">924</span>
 <span id="925">925</span>
 <span id="926">926</span>
 <span id="927">927</span>
 <span id="928">928</span>
 <span id="929">929</span>
 <span id="930">930</span>
 <span id="931">931</span>
 <span id="932">932</span>
 <span id="933">933</span>
 <span id="934">934</span>
 <span id="935">935</span>
 <span id="936">936</span>
 <span id="937">937</span>
 <span id="938">938</span>
 <span id="939">939</span>
 <span id="940">940</span>
 <span id="941">941</span>
 <span id="942">942</span>
 <span id="943">943</span>
 <span id="944">944</span>
 <span id="945">945</span>
 <span id="946">946</span>
 <span id="947">947</span>
 <span id="948">948</span>
 <span id="949">949</span>
 <span id="950">950</span>
 <span id="951">951</span>
 <span id="952">952</span>
 <span id="953">953</span>
 <span id="954">954</span>
 <span id="955">955</span>
 <span id="956">956</span>
 <span id="957">957</span>
 <span id="958">958</span>
 <span id="959">959</span>
 <span id="960">960</span>
 <span id="961">961</span>
 <span id="962">962</span>
 <span id="963">963</span>
 <span id="964">964</span>
 <span id="965">965</span>
 <span id="966">966</span>
 <span id="967">967</span>
 <span id="968">968</span>
 <span id="969">969</span>
 <span id="970">970</span>
 <span id="971">971</span>
 <span id="972">972</span>
 <span id="973">973</span>
 <span id="974">974</span>
 <span id="975">975</span>
 <span id="976">976</span>
 <span id="977">977</span>
 <span id="978">978</span>
 <span id="979">979</span>
 <span id="980">980</span>
 <span id="981">981</span>
 <span id="982">982</span>
 <span id="983">983</span>
 <span id="984">984</span>
 <span id="985">985</span>
 <span id="986">986</span>
 <span id="987">987</span>
 <span id="988">988</span>
 <span id="989">989</span>
 <span id="990">990</span>
 <span id="991">991</span>
 <span id="992">992</span>
 <span id="993">993</span>
 <span id="994">994</span>
 <span id="995">995</span>
 <span id="996">996</span>
 <span id="997">997</span>
 <span id="998">998</span>
 <span id="999">999</span>
 <span id="1000">1000</span>
 <span id="1001">1001</span>
 <span id="1002">1002</span>
 <span id="1003">1003</span>
 <span id="1004">1004</span>
 <span id="1005">1005</span>
 <span id="1006">1006</span>
 <span id="1007">1007</span>
 <span id="1008">1008</span>
 <span id="1009">1009</span>
 <span id="1010">1010</span>
 <span id="1011">1011</span>
 <span id="1012">1012</span>
 <span id="1013">1013</span>
 <span id="1014">1014</span>
 <span id="1015">1015</span>
 <span id="1016">1016</span>
 <span id="1017">1017</span>
 <span id="1018">1018</span>
 <span id="1019">1019</span>
 <span id="1020">1020</span>
 <span id="1021">1021</span>
 <span id="1022">1022</span>
 <span id="1023">1023</span>
 <span id="1024">1024</span>
 <span id="1025">1025</span>
 <span id="1026">1026</span>
 <span id="1027">1027</span>
 <span id="1028">1028</span>
 <span id="1029">1029</span>
 <span id="1030">1030</span>
 <span id="1031">1031</span>
 <span id="1032">1032</span>
 <span id="1033">1033</span>
 <span id="1034">1034</span>
 <span id="1035">1035</span>
 <span id="1036">1036</span>
 <span id="1037">1037</span>
 <span id="1038">1038</span>
 <span id="1039">1039</span>
 <span id="1040">1040</span>
 <span id="1041">1041</span>
 <span id="1042">1042</span>
 <span id="1043">1043</span>
 <span id="1044">1044</span>
 <span id="1045">1045</span>
 <span id="1046">1046</span>
 <span id="1047">1047</span>
 <span id="1048">1048</span>
 <span id="1049">1049</span>
 <span id="1050">1050</span>
 <span id="1051">1051</span>
 <span id="1052">1052</span>
 <span id="1053">1053</span>
 <span id="1054">1054</span>
 <span id="1055">1055</span>
 <span id="1056">1056</span>
 <span id="1057">1057</span>
 <span id="1058">1058</span>
 <span id="1059">1059</span>
 <span id="1060">1060</span>
 <span id="1061">1061</span>
 <span id="1062">1062</span>
 <span id="1063">1063</span>
 <span id="1064">1064</span>
 <span id="1065">1065</span>
 <span id="1066">1066</span>
 <span id="1067">1067</span>
 <span id="1068">1068</span>
 <span id="1069">1069</span>
 <span id="1070">1070</span>
 <span id="1071">1071</span>
 <span id="1072">1072</span>
 <span id="1073">1073</span>
 <span id="1074">1074</span>
 <span id="1075">1075</span>
 <span id="1076">1076</span>
 <span id="1077">1077</span>
 <span id="1078">1078</span>
 <span id="1079">1079</span>
 <span id="1080">1080</span>
 <span id="1081">1081</span>
 <span id="1082">1082</span>
 <span id="1083">1083</span>
 <span id="1084">1084</span>
 <span id="1085">1085</span>
 <span id="1086">1086</span>
 <span id="1087">1087</span>
 <span id="1088">1088</span>
 <span id="1089">1089</span>
 <span id="1090">1090</span>
 <span id="1091">1091</span>
 <span id="1092">1092</span>
 <span id="1093">1093</span>
 <span id="1094">1094</span>
 <span id="1095">1095</span>
 <span id="1096">1096</span>
 <span id="1097">1097</span>
 <span id="1098">1098</span>
 <span id="1099">1099</span>
 <span id="1100">1100</span>
 <span id="1101">1101</span>
 <span id="1102">1102</span>
 <span id="1103">1103</span>
 <span id="1104">1104</span>
 <span id="1105">1105</span>
 <span id="1106">1106</span>
 <span id="1107">1107</span>
 <span id="1108">1108</span>
 <span id="1109">1109</span>
 <span id="1110">1110</span>
 <span id="1111">1111</span>
 <span id="1112">1112</span>
 <span id="1113">1113</span>
 <span id="1114">1114</span>
 <span id="1115">1115</span>
 </pre><pre class="rust"><code><span class="doccomment">//! Metadata describing trace data.
 </span><span class="kw">use super</span>::{callsite, field};
 <span class="kw">use </span><span class="kw">crate</span>::stdlib::{
     cmp, fmt,
     str::FromStr,
     sync::atomic::{AtomicUsize, Ordering},
 };

 <span class="doccomment">/// Metadata describing a [span] or [event].
 ///
 /// All spans and events have the following metadata:
 /// - A [name], represented as a static string.
 /// - A [target], a string that categorizes part of the system where the span
 ///   or event occurred. The `tracing` macros default to using the module
 ///   path where the span or event originated as the target, but it may be
 ///   overridden.
 /// - A [verbosity level]. This determines how verbose a given span or event
 ///   is, and allows enabling or disabling more verbose diagnostics
 ///   situationally. See the documentation for the [`Level`] type for details.
 /// - The names of the [fields] defined by the span or event.
 /// - Whether the metadata corresponds to a span or event.
 ///
 /// In addition, the following optional metadata describing the source code
 /// location where the span or event originated _may_ be provided:
 /// - The [file name]
 /// - The [line number]
 /// - The [module path]
 ///
 /// Metadata is used by [`Subscriber`]s when filtering spans and events, and it
 /// may also be used as part of their data payload.
 ///
 /// When created by the `event!` or `span!` macro, the metadata describing a
 /// particular event or span is constructed statically and exists as a single
 /// static instance. Thus, the overhead of creating the metadata is
 /// _significantly_ lower than that of creating the actual span. Therefore,
 /// filtering is based on metadata, rather than on the constructed span.
 ///
 /// ## Equality
 ///
 /// In well-behaved applications, two `Metadata` with equal
 /// [callsite identifiers] will be equal in all other ways (i.e., have the same
 /// `name`, `target`, etc.). Consequently, in release builds, [`Metadata::eq`]
 /// *only* checks that its arguments have equal callsites. However, the equality
 /// of `Metadata`&#39;s other fields is checked in debug builds.
 ///
 /// [span]: super::span
 /// [event]: super::event
 /// [name]: Self::name
 /// [target]: Self::target
 /// [fields]: Self::fields
 /// [verbosity level]: Self::level
 /// [file name]: Self::file
 /// [line number]: Self::line
 /// [module path]: Self::module_path
 /// [`Subscriber`]: super::subscriber::Subscriber
 /// [callsite identifiers]: Self::callsite
 </span><span class="kw">pub struct </span>Metadata&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// The name of the span described by this metadata.
     </span>name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,

     <span class="doccomment">/// The part of the system that the span that this metadata describes
     /// occurred in.
     </span>target: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str,

     <span class="doccomment">/// The level of verbosity of the described span.
     </span>level: Level,

     <span class="doccomment">/// The name of the Rust module where the span occurred, or `None` if this
     /// could not be determined.
     </span>module_path: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt;,

     <span class="doccomment">/// The name of the source code file where the span occurred, or `None` if
     /// this could not be determined.
     </span>file: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt;,

     <span class="doccomment">/// The line number in the source code file where the span occurred, or
     /// `None` if this could not be determined.
     </span>line: <span class="prelude-ty">Option</span>&lt;u32&gt;,

     <span class="doccomment">/// The names of the key-value fields attached to the described span or
     /// event.
     </span>fields: field::FieldSet,

     <span class="doccomment">/// The kind of the callsite.
     </span>kind: Kind,
 }

 <span class="doccomment">/// Indicates whether the callsite is a span or event.
 </span><span class="attribute">#[derive(Clone, Eq, PartialEq)]
 </span><span class="kw">pub struct </span>Kind(u8);

 <span class="doccomment">/// Describes the level of verbosity of a span or event.
 ///
 /// # Comparing Levels
 ///
 /// `Level` implements the [`PartialOrd`] and [`Ord`] traits, allowing two
 /// `Level`s to be compared to determine which is considered more or less
 /// verbose. Levels which are more verbose are considered &quot;greater than&quot; levels
 /// which are less verbose, with [`Level::ERROR`] considered the lowest, and
 /// [`Level::TRACE`] considered the highest.
 ///
 /// For example:
 /// ```
 /// use tracing_core::Level;
 ///
 /// assert!(Level::TRACE &gt; Level::DEBUG);
 /// assert!(Level::ERROR &lt; Level::WARN);
 /// assert!(Level::INFO &lt;= Level::DEBUG);
 /// assert_eq!(Level::TRACE, Level::TRACE);
 /// ```
 ///
 /// # Filtering
 ///
 /// `Level`s are typically used to implement filtering that determines which
 /// spans and events are enabled. Depending on the use case, more or less
 /// verbose diagnostics may be desired. For example, when running in
 /// development, [`DEBUG`]-level traces may be enabled by default. When running in
 /// production, only [`INFO`]-level and lower traces might be enabled. Libraries
 /// may include very verbose diagnostics at the [`DEBUG`] and/or [`TRACE`] levels.
 /// Applications using those libraries typically chose to ignore those traces. However, when
 /// debugging an issue involving said libraries, it may be useful to temporarily
 /// enable the more verbose traces.
 ///
 /// The [`LevelFilter`] type is provided to enable filtering traces by
 /// verbosity. `Level`s can be compared against [`LevelFilter`]s, and
 /// [`LevelFilter`] has a variant for each `Level`, which compares analogously
 /// to that level. In addition, [`LevelFilter`] adds a [`LevelFilter::OFF`]
 /// variant, which is considered &quot;less verbose&quot; than every other `Level`. This is
 /// intended to allow filters to completely disable tracing in a particular context.
 ///
 /// For example:
 /// ```
 /// use tracing_core::{Level, LevelFilter};
 ///
 /// assert!(LevelFilter::OFF &lt; Level::TRACE);
 /// assert!(LevelFilter::TRACE &gt; Level::DEBUG);
 /// assert!(LevelFilter::ERROR &lt; Level::WARN);
 /// assert!(LevelFilter::INFO &lt;= Level::DEBUG);
 /// assert!(LevelFilter::INFO &gt;= Level::INFO);
 /// ```
 ///
 /// ## Examples
 ///
 /// Below is a simple example of how a [`Subscriber`] could implement filtering through
 /// a [`LevelFilter`]. When a span or event is recorded, the [`Subscriber::enabled`] method
 /// compares the span or event&#39;s `Level` against the configured [`LevelFilter`].
 /// The optional [`Subscriber::max_level_hint`] method can also be implemented to allow spans
 /// and events above a maximum verbosity level to be skipped more efficiently,
 /// often improving performance in short-lived programs.
 ///
 /// ```
 /// use tracing_core::{span, Event, Level, LevelFilter, Subscriber, Metadata};
 /// # use tracing_core::span::{Id, Record, Current};
 ///
 /// #[derive(Debug)]
 /// pub struct MySubscriber {
 ///     /// The most verbose level that this subscriber will enable.
 ///     max_level: LevelFilter,
 ///
 ///     // ...
 /// }
 ///
 /// impl MySubscriber {
 ///     /// Returns a new `MySubscriber` which will record spans and events up to
 ///     /// `max_level`.
 ///     pub fn with_max_level(max_level: LevelFilter) -&gt; Self {
 ///         Self {
 ///             max_level,
 ///             // ...
 ///         }
 ///     }
 /// }
 /// impl Subscriber for MySubscriber {
 ///     fn enabled(&amp;self, meta: &amp;Metadata&lt;&#39;_&gt;) -&gt; bool {
 ///         // A span or event is enabled if it is at or below the configured
 ///         // maximum level.
 ///         meta.level() &lt;= &amp;self.max_level
 ///     }
 ///
 ///     // This optional method returns the most verbose level that this
 ///     // subscriber will enable. Although implementing this method is not
 ///     // *required*, it permits additional optimizations when it is provided,
 ///     // allowing spans and events above the max level to be skipped
 ///     // more efficiently.
 ///     fn max_level_hint(&amp;self) -&gt; Option&lt;LevelFilter&gt; {
 ///         Some(self.max_level)
 ///     }
 ///
 ///     // Implement the rest of the subscriber...
 ///     fn new_span(&amp;self, span: &amp;span::Attributes&lt;&#39;_&gt;) -&gt; span::Id {
 ///         // ...
 ///         # drop(span); Id::from_u64(1)
 ///     }

 ///     fn event(&amp;self, event: &amp;Event&lt;&#39;_&gt;) {
 ///         // ...
 ///         # drop(event);
 ///     }
 ///
 ///     // ...
 ///     # fn enter(&amp;self, _: &amp;Id) {}
 ///     # fn exit(&amp;self, _: &amp;Id) {}
 ///     # fn record(&amp;self, _: &amp;Id, _: &amp;Record&lt;&#39;_&gt;) {}
 ///     # fn record_follows_from(&amp;self, _: &amp;Id, _: &amp;Id) {}
 /// }
 /// ```
 ///
 /// It is worth noting that the `tracing-subscriber` crate provides [additional
 /// APIs][envfilter] for performing more sophisticated filtering, such as
 /// enabling different levels based on which module or crate a span or event is
 /// recorded in.
 ///
 /// [`DEBUG`]: Level::DEBUG
 /// [`INFO`]: Level::INFO
 /// [`TRACE`]: Level::TRACE
 /// [`Subscriber::enabled`]: crate::subscriber::Subscriber::enabled
 /// [`Subscriber::max_level_hint`]: crate::subscriber::Subscriber::max_level_hint
 /// [`Subscriber`]: crate::subscriber::Subscriber
 /// [envfilter]: https://docs.rs/tracing-subscriber/latest/tracing_subscriber/filter/struct.EnvFilter.html
 </span><span class="attribute">#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
 </span><span class="kw">pub struct </span>Level(LevelInner);

 <span class="doccomment">/// A filter comparable to a verbosity [`Level`].
 ///
 /// If a [`Level`] is considered less than a `LevelFilter`, it should be
 /// considered enabled; if greater than or equal to the `LevelFilter`,
 /// that level is disabled. See [`LevelFilter::current`] for more
 /// details.
 ///
 /// Note that this is essentially identical to the `Level` type, but with the
 /// addition of an [`OFF`] level that completely disables all trace
 /// instrumentation.
 ///
 /// See the documentation for the [`Level`] type to see how `Level`s
 /// and `LevelFilter`s interact.
 ///
 /// [`OFF`]: LevelFilter::OFF
 </span><span class="attribute">#[repr(transparent)]
 #[derive(Copy, Clone, Eq, PartialEq, Hash)]
 </span><span class="kw">pub struct </span>LevelFilter(<span class="prelude-ty">Option</span>&lt;Level&gt;);

 <span class="doccomment">/// Indicates that a string could not be parsed to a valid level.
 </span><span class="attribute">#[derive(Clone, Debug)]
 </span><span class="kw">pub struct </span>ParseLevelFilterError(());

 <span class="kw">static </span>MAX_LEVEL: AtomicUsize = AtomicUsize::new(LevelFilter::OFF_USIZE);

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

 </span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Metadata&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="doccomment">/// Construct new metadata for a span or event, with a name, target, level, field
     /// names, and optional source code location.
     </span><span class="kw">pub const fn </span>new(
         name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str,
         target: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str,
         level: Level,
         file: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt;,
         line: <span class="prelude-ty">Option</span>&lt;u32&gt;,
         module_path: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt;,
         fields: field::FieldSet,
         kind: Kind,
     ) -&gt; <span class="self">Self </span>{
         Metadata {
             name,
             target,
             level,
             module_path,
             file,
             line,
             fields,
             kind,
         }
     }

     <span class="doccomment">/// Returns the names of the fields on the described span or event.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>fields(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>field::FieldSet {
         <span class="kw-2">&amp;</span><span class="self">self</span>.fields
     }

     <span class="doccomment">/// Returns the level of verbosity of the described span or event.
     </span><span class="kw">pub fn </span>level(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Level {
         <span class="kw-2">&amp;</span><span class="self">self</span>.level
     }

     <span class="doccomment">/// Returns the name of the span.
     </span><span class="kw">pub fn </span>name(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str {
         <span class="self">self</span>.name
     }

     <span class="doccomment">/// Returns a string describing the part of the system where the span or
     /// event that this metadata describes occurred.
     ///
     /// Typically, this is the module path, but alternate targets may be set
     /// when spans or events are constructed.
     </span><span class="kw">pub fn </span>target(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str {
         <span class="self">self</span>.target
     }

     <span class="doccomment">/// Returns the path to the Rust module where the span occurred, or
     /// `None` if the module path is unknown.
     </span><span class="kw">pub fn </span>module_path(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt; {
         <span class="self">self</span>.module_path
     }

     <span class="doccomment">/// Returns the name of the source code file where the span
     /// occurred, or `None` if the file is unknown
     </span><span class="kw">pub fn </span>file(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt; {
         <span class="self">self</span>.file
     }

     <span class="doccomment">/// Returns the line number in the source code file where the span
     /// occurred, or `None` if the line number is unknown.
     </span><span class="kw">pub fn </span>line(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;u32&gt; {
         <span class="self">self</span>.line
     }

     <span class="doccomment">/// Returns an opaque `Identifier` that uniquely identifies the callsite
     /// this `Metadata` originated from.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>callsite(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; callsite::Identifier {
         <span class="self">self</span>.fields.callsite()
     }

     <span class="doccomment">/// Returns true if the callsite kind is `Event`.
     </span><span class="kw">pub fn </span>is_event(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.kind.is_event()
     }

     <span class="doccomment">/// Return true if the callsite kind is `Span`.
     </span><span class="kw">pub fn </span>is_span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.kind.is_span()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; fmt::Debug <span class="kw">for </span>Metadata&lt;<span class="lifetime">&#39;a</span>&gt; {
     <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&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="kw">let </span><span class="kw-2">mut </span>meta = f.debug_struct(<span class="string">&quot;Metadata&quot;</span>);
         meta.field(<span class="string">&quot;name&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.name)
             .field(<span class="string">&quot;target&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.target)
             .field(<span class="string">&quot;level&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.level);

         <span class="kw">if let </span><span class="prelude-val">Some</span>(path) = <span class="self">self</span>.module_path() {
             meta.field(<span class="string">&quot;module_path&quot;</span>, <span class="kw-2">&amp;</span>path);
         }

         <span class="kw">match </span>(<span class="self">self</span>.file(), <span class="self">self</span>.line()) {
             (<span class="prelude-val">Some</span>(file), <span class="prelude-val">Some</span>(line)) =&gt; {
                 meta.field(<span class="string">&quot;location&quot;</span>, <span class="kw-2">&amp;</span><span class="macro">format_args!</span>(<span class="string">&quot;{}:{}&quot;</span>, file, line));
             }
             (<span class="prelude-val">Some</span>(file), <span class="prelude-val">None</span>) =&gt; {
                 meta.field(<span class="string">&quot;file&quot;</span>, <span class="kw-2">&amp;</span><span class="macro">format_args!</span>(<span class="string">&quot;{}&quot;</span>, file));
             }

             <span class="comment">// Note: a line num with no file is a kind of weird case that _probably_ never occurs...
             </span>(<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(line)) =&gt; {
                 meta.field(<span class="string">&quot;line&quot;</span>, <span class="kw-2">&amp;</span>line);
             }
             (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) =&gt; {}
         };

         meta.field(<span class="string">&quot;fields&quot;</span>, <span class="kw-2">&amp;</span><span class="macro">format_args!</span>(<span class="string">&quot;{}&quot;</span>, <span class="self">self</span>.fields))
             .field(<span class="string">&quot;callsite&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.callsite())
             .field(<span class="string">&quot;kind&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.kind)
             .finish()
     }
 }

 <span class="kw">impl </span>Kind {
     <span class="kw">const </span>EVENT_BIT: u8 = <span class="number">1 </span>&lt;&lt; <span class="number">0</span>;
     <span class="kw">const </span>SPAN_BIT: u8 = <span class="number">1 </span>&lt;&lt; <span class="number">1</span>;
     <span class="kw">const </span>HINT_BIT: u8 = <span class="number">1 </span>&lt;&lt; <span class="number">2</span>;

     <span class="doccomment">/// `Event` callsite
     </span><span class="kw">pub const </span>EVENT: Kind = Kind(<span class="self">Self</span>::EVENT_BIT);

     <span class="doccomment">/// `Span` callsite
     </span><span class="kw">pub const </span>SPAN: Kind = Kind(<span class="self">Self</span>::SPAN_BIT);

     <span class="doccomment">/// `enabled!` callsite. [`Subscriber`][`crate::subscriber::Subscriber`]s can assume
     /// this `Kind` means they will never recieve a
     /// full event with this [`Metadata`].
     </span><span class="kw">pub const </span>HINT: Kind = Kind(<span class="self">Self</span>::HINT_BIT);

     <span class="doccomment">/// Return true if the callsite kind is `Span`
     </span><span class="kw">pub fn </span>is_span(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.<span class="number">0 </span>&amp; <span class="self">Self</span>::SPAN_BIT == <span class="self">Self</span>::SPAN_BIT
     }

     <span class="doccomment">/// Return true if the callsite kind is `Event`
     </span><span class="kw">pub fn </span>is_event(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.<span class="number">0 </span>&amp; <span class="self">Self</span>::EVENT_BIT == <span class="self">Self</span>::EVENT_BIT
     }

     <span class="doccomment">/// Return true if the callsite kind is `Hint`
     </span><span class="kw">pub fn </span>is_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.<span class="number">0 </span>&amp; <span class="self">Self</span>::HINT_BIT == <span class="self">Self</span>::HINT_BIT
     }

     <span class="doccomment">/// Sets that this `Kind` is a [hint](Self::HINT).
     ///
     /// This can be called on [`SPAN`](Self::SPAN) and [`EVENT`](Self::EVENT)
     /// kinds to construct a hint callsite that also counts as a span or event.
     </span><span class="kw">pub const fn </span>hint(<span class="self">self</span>) -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>(<span class="self">self</span>.<span class="number">0 </span>| <span class="self">Self</span>::HINT_BIT)
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Kind {
     <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&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.write_str(<span class="string">&quot;Kind(&quot;</span>)<span class="question-mark">?</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>has_bits = <span class="bool-val">false</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>write_bit = |name: <span class="kw-2">&amp;</span>str| {
             <span class="kw">if </span>has_bits {
                 f.write_str(<span class="string">&quot; | &quot;</span>)<span class="question-mark">?</span>;
             }
             f.write_str(name)<span class="question-mark">?</span>;
             has_bits = <span class="bool-val">true</span>;
             <span class="prelude-val">Ok</span>(())
         };

         <span class="kw">if </span><span class="self">self</span>.is_event() {
             write_bit(<span class="string">&quot;EVENT&quot;</span>)<span class="question-mark">?</span>;
         }

         <span class="kw">if </span><span class="self">self</span>.is_span() {
             write_bit(<span class="string">&quot;SPAN&quot;</span>)<span class="question-mark">?</span>;
         }

         <span class="kw">if </span><span class="self">self</span>.is_hint() {
             write_bit(<span class="string">&quot;HINT&quot;</span>)<span class="question-mark">?</span>;
         }

         <span class="comment">// if none of the expected bits were set, something is messed up, so
         // just print the bits for debugging purposes
         </span><span class="kw">if </span>!has_bits {
             <span class="macro">write!</span>(f, <span class="string">&quot;{:#b}&quot;</span>, <span class="self">self</span>.<span class="number">0</span>)<span class="question-mark">?</span>;
         }

         f.write_str(<span class="string">&quot;)&quot;</span>)
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Eq <span class="kw">for </span>Metadata&lt;<span class="lifetime">&#39;a</span>&gt; {}

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; PartialEq <span class="kw">for </span>Metadata&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="attribute">#[inline]
     </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 class="self">Self</span>) -&gt; bool {
         <span class="kw">if </span>core::ptr::eq(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw-2">&amp;</span>other) {
             <span class="bool-val">true
         </span>} <span class="kw">else if </span><span class="macro">cfg!</span>(not(debug_assertions)) {
             <span class="comment">// In a well-behaving application, two `Metadata` can be assumed to
             // be totally equal so long as they share the same callsite.
             </span><span class="self">self</span>.callsite() == other.callsite()
         } <span class="kw">else </span>{
             <span class="comment">// However, when debug-assertions are enabled, do not assume that
             // the application is well-behaving; check every field of `Metadata`
             // for equality.

             // `Metadata` is destructured here to ensure a compile-error if the
             // fields of `Metadata` change.
             </span><span class="kw">let </span>Metadata {
                 name: lhs_name,
                 target: lhs_target,
                 level: lhs_level,
                 module_path: lhs_module_path,
                 file: lhs_file,
                 line: lhs_line,
                 fields: lhs_fields,
                 kind: lhs_kind,
             } = <span class="self">self</span>;

             <span class="kw">let </span>Metadata {
                 name: rhs_name,
                 target: rhs_target,
                 level: rhs_level,
                 module_path: rhs_module_path,
                 file: rhs_file,
                 line: rhs_line,
                 fields: rhs_fields,
                 kind: rhs_kind,
             } = <span class="kw-2">&amp;</span>other;

             <span class="comment">// The initial comparison of callsites is purely an optimization;
             // it can be removed without affecting the overall semantics of the
             // expression.
             </span><span class="self">self</span>.callsite() == other.callsite()
                 &amp;&amp; lhs_name == rhs_name
                 &amp;&amp; lhs_target == rhs_target
                 &amp;&amp; lhs_level == rhs_level
                 &amp;&amp; lhs_module_path == rhs_module_path
                 &amp;&amp; lhs_file == rhs_file
                 &amp;&amp; lhs_line == rhs_line
                 &amp;&amp; lhs_fields == rhs_fields
                 &amp;&amp; lhs_kind == rhs_kind
         }
     }
 }

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

 </span><span class="kw">impl </span>Level {
     <span class="doccomment">/// The &quot;error&quot; level.
     ///
     /// Designates very serious errors.
     </span><span class="kw">pub const </span>ERROR: Level = Level(LevelInner::Error);
     <span class="doccomment">/// The &quot;warn&quot; level.
     ///
     /// Designates hazardous situations.
     </span><span class="kw">pub const </span>WARN: Level = Level(LevelInner::Warn);
     <span class="doccomment">/// The &quot;info&quot; level.
     ///
     /// Designates useful information.
     </span><span class="kw">pub const </span>INFO: Level = Level(LevelInner::Info);
     <span class="doccomment">/// The &quot;debug&quot; level.
     ///
     /// Designates lower priority information.
     </span><span class="kw">pub const </span>DEBUG: Level = Level(LevelInner::Debug);
     <span class="doccomment">/// The &quot;trace&quot; level.
     ///
     /// Designates very low priority, often extremely verbose, information.
     </span><span class="kw">pub const </span>TRACE: Level = Level(LevelInner::Trace);

     <span class="doccomment">/// Returns the string representation of the `Level`.
     ///
     /// This returns the same string as the `fmt::Display` implementation.
     </span><span class="kw">pub fn </span>as_str(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             Level::TRACE =&gt; <span class="string">&quot;TRACE&quot;</span>,
             Level::DEBUG =&gt; <span class="string">&quot;DEBUG&quot;</span>,
             Level::INFO =&gt; <span class="string">&quot;INFO&quot;</span>,
             Level::WARN =&gt; <span class="string">&quot;WARN&quot;</span>,
             Level::ERROR =&gt; <span class="string">&quot;ERROR&quot;</span>,
         }
     }
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Level {
     <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&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             Level::TRACE =&gt; f.pad(<span class="string">&quot;TRACE&quot;</span>),
             Level::DEBUG =&gt; f.pad(<span class="string">&quot;DEBUG&quot;</span>),
             Level::INFO =&gt; f.pad(<span class="string">&quot;INFO&quot;</span>),
             Level::WARN =&gt; f.pad(<span class="string">&quot;WARN&quot;</span>),
             Level::ERROR =&gt; f.pad(<span class="string">&quot;ERROR&quot;</span>),
         }
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;std&quot;</span>)))]
 </span><span class="kw">impl </span><span class="kw">crate</span>::stdlib::error::Error <span class="kw">for </span>ParseLevelError {}

 <span class="kw">impl </span>FromStr <span class="kw">for </span>Level {
     <span class="kw">type </span><span class="prelude-val">Err </span>= ParseLevelError;
     <span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, ParseLevelError&gt; {
         s.parse::&lt;usize&gt;()
             .map_err(|<span class="kw">_</span>| ParseLevelError { _p: () })
             .and_then(|num| <span class="kw">match </span>num {
                 <span class="number">1 </span>=&gt; <span class="prelude-val">Ok</span>(Level::ERROR),
                 <span class="number">2 </span>=&gt; <span class="prelude-val">Ok</span>(Level::WARN),
                 <span class="number">3 </span>=&gt; <span class="prelude-val">Ok</span>(Level::INFO),
                 <span class="number">4 </span>=&gt; <span class="prelude-val">Ok</span>(Level::DEBUG),
                 <span class="number">5 </span>=&gt; <span class="prelude-val">Ok</span>(Level::TRACE),
                 <span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(ParseLevelError { _p: () }),
             })
             .or_else(|<span class="kw">_</span>| <span class="kw">match </span>s {
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;error&quot;</span>) =&gt; <span class="prelude-val">Ok</span>(Level::ERROR),
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;warn&quot;</span>) =&gt; <span class="prelude-val">Ok</span>(Level::WARN),
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;info&quot;</span>) =&gt; <span class="prelude-val">Ok</span>(Level::INFO),
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;debug&quot;</span>) =&gt; <span class="prelude-val">Ok</span>(Level::DEBUG),
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;trace&quot;</span>) =&gt; <span class="prelude-val">Ok</span>(Level::TRACE),
                 <span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(ParseLevelError { _p: () }),
             })
     }
 }

 <span class="attribute">#[repr(usize)]
 #[derive(Copy, Clone, Debug, Hash, Eq, PartialEq)]
 </span><span class="kw">enum </span>LevelInner {
     <span class="doccomment">/// The &quot;trace&quot; level.
     ///
     /// Designates very low priority, often extremely verbose, information.
     </span>Trace = <span class="number">0</span>,
     <span class="doccomment">/// The &quot;debug&quot; level.
     ///
     /// Designates lower priority information.
     </span>Debug = <span class="number">1</span>,
     <span class="doccomment">/// The &quot;info&quot; level.
     ///
     /// Designates useful information.
     </span>Info = <span class="number">2</span>,
     <span class="doccomment">/// The &quot;warn&quot; level.
     ///
     /// Designates hazardous situations.
     </span>Warn = <span class="number">3</span>,
     <span class="doccomment">/// The &quot;error&quot; level.
     ///
     /// Designates very serious errors.
     </span>Error = <span class="number">4</span>,
 }

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

 </span><span class="kw">impl </span>From&lt;Level&gt; <span class="kw">for </span>LevelFilter {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>from(level: Level) -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>::from_level(level)
     }
 }

 <span class="kw">impl </span>From&lt;<span class="prelude-ty">Option</span>&lt;Level&gt;&gt; <span class="kw">for </span>LevelFilter {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>from(level: <span class="prelude-ty">Option</span>&lt;Level&gt;) -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>(level)
     }
 }

 <span class="kw">impl </span>From&lt;LevelFilter&gt; <span class="kw">for </span><span class="prelude-ty">Option</span>&lt;Level&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>from(filter: LevelFilter) -&gt; <span class="self">Self </span>{
         filter.into_level()
     }
 }

 <span class="kw">impl </span>LevelFilter {
     <span class="doccomment">/// The &quot;off&quot; level.
     ///
     /// Designates that trace instrumentation should be completely disabled.
     </span><span class="kw">pub const </span>OFF: LevelFilter = LevelFilter(<span class="prelude-val">None</span>);
     <span class="doccomment">/// The &quot;error&quot; level.
     ///
     /// Designates very serious errors.
     </span><span class="kw">pub const </span>ERROR: LevelFilter = LevelFilter::from_level(Level::ERROR);
     <span class="doccomment">/// The &quot;warn&quot; level.
     ///
     /// Designates hazardous situations.
     </span><span class="kw">pub const </span>WARN: LevelFilter = LevelFilter::from_level(Level::WARN);
     <span class="doccomment">/// The &quot;info&quot; level.
     ///
     /// Designates useful information.
     </span><span class="kw">pub const </span>INFO: LevelFilter = LevelFilter::from_level(Level::INFO);
     <span class="doccomment">/// The &quot;debug&quot; level.
     ///
     /// Designates lower priority information.
     </span><span class="kw">pub const </span>DEBUG: LevelFilter = LevelFilter::from_level(Level::DEBUG);
     <span class="doccomment">/// The &quot;trace&quot; level.
     ///
     /// Designates very low priority, often extremely verbose, information.
     </span><span class="kw">pub const </span>TRACE: LevelFilter = LevelFilter(<span class="prelude-val">Some</span>(Level::TRACE));

     <span class="doccomment">/// Returns a `LevelFilter` that enables spans and events with verbosity up
     /// to and including `level`.
     </span><span class="kw">pub const fn </span>from_level(level: Level) -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>(<span class="prelude-val">Some</span>(level))
     }

     <span class="doccomment">/// Returns the most verbose [`Level`] that this filter accepts, or `None`
     /// if it is [`OFF`].
     ///
     /// [`OFF`]: LevelFilter::OFF
     </span><span class="kw">pub const fn </span>into_level(<span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Level&gt; {
         <span class="self">self</span>.<span class="number">0
     </span>}

     <span class="comment">// These consts are necessary because `as` casts are not allowed as
     // match patterns.
     </span><span class="kw">const </span>ERROR_USIZE: usize = LevelInner::Error <span class="kw">as </span>usize;
     <span class="kw">const </span>WARN_USIZE: usize = LevelInner::Warn <span class="kw">as </span>usize;
     <span class="kw">const </span>INFO_USIZE: usize = LevelInner::Info <span class="kw">as </span>usize;
     <span class="kw">const </span>DEBUG_USIZE: usize = LevelInner::Debug <span class="kw">as </span>usize;
     <span class="kw">const </span>TRACE_USIZE: usize = LevelInner::Trace <span class="kw">as </span>usize;
     <span class="comment">// Using the value of the last variant + 1 ensures that we match the value
     // for `Option::None` as selected by the niche optimization for
     // `LevelFilter`. If this is the case, converting a `usize` value into a
     // `LevelFilter` (in `LevelFilter::current`) will be an identity conversion,
     // rather than generating a lookup table.
     </span><span class="kw">const </span>OFF_USIZE: usize = LevelInner::Error <span class="kw">as </span>usize + <span class="number">1</span>;

     <span class="doccomment">/// Returns a `LevelFilter` that matches the most verbose [`Level`] that any
     /// currently active [`Subscriber`] will enable.
     ///
     /// User code should treat this as a *hint*. If a given span or event has a
     /// level *higher* than the returned `LevelFilter`, it will not be enabled.
     /// However, if the level is less than or equal to this value, the span or
     /// event is *not* guaranteed to be enabled; the subscriber will still
     /// filter each callsite individually.
     ///
     /// Therefore, comparing a given span or event&#39;s level to the returned
     /// `LevelFilter` **can** be used for determining if something is
     /// *disabled*, but **should not** be used for determining if something is
     /// *enabled*.
     ///
     /// [`Level`]: super::Level
     /// [`Subscriber`]: super::Subscriber
     </span><span class="attribute">#[inline(always)]
     </span><span class="kw">pub fn </span>current() -&gt; <span class="self">Self </span>{
         <span class="kw">match </span>MAX_LEVEL.load(Ordering::Relaxed) {
             <span class="self">Self</span>::ERROR_USIZE =&gt; <span class="self">Self</span>::ERROR,
             <span class="self">Self</span>::WARN_USIZE =&gt; <span class="self">Self</span>::WARN,
             <span class="self">Self</span>::INFO_USIZE =&gt; <span class="self">Self</span>::INFO,
             <span class="self">Self</span>::DEBUG_USIZE =&gt; <span class="self">Self</span>::DEBUG,
             <span class="self">Self</span>::TRACE_USIZE =&gt; <span class="self">Self</span>::TRACE,
             <span class="self">Self</span>::OFF_USIZE =&gt; <span class="self">Self</span>::OFF,
             <span class="attribute">#[cfg(debug_assertions)]
             </span>unknown =&gt; <span class="macro">unreachable!</span>(
                 <span class="string">&quot;/!\\ `LevelFilter` representation seems to have changed! /!\\ \n\
                 This is a bug (and it&#39;s pretty bad). Please contact the `tracing` \
                 maintainers. Thank you and I&#39;m sorry.\n \
                 The offending repr was: {:?}&quot;</span>,
                 unknown,
             ),
             <span class="attribute">#[cfg(not(debug_assertions))]
             </span><span class="kw">_ </span>=&gt; <span class="kw">unsafe </span>{
                 <span class="comment">// Using `unreachable_unchecked` here (rather than
                 // `unreachable!()`) is necessary to ensure that rustc generates
                 // an identity conversion from integer -&gt; discriminant, rather
                 // than generating a lookup table. We want to ensure this
                 // function is a single `mov` instruction (on x86) if at all
                 // possible, because it is called *every* time a span/event
                 // callsite is hit; and it is (potentially) the only code in the
                 // hottest path for skipping a majority of callsites when level
                 // filtering is in use.
                 //
                 // safety: This branch is only truly unreachable if we guarantee
                 // that no values other than the possible enum discriminants
                 // will *ever* be present. The `AtomicUsize` is initialized to
                 // the `OFF` value. It is only set by the `set_max` function,
                 // which takes a `LevelFilter` as a parameter. This restricts
                 // the inputs to `set_max` to the set of valid discriminants.
                 // Therefore, **as long as `MAX_VALUE` is only ever set by
                 // `set_max`**, this is safe.
                 </span><span class="kw">crate</span>::stdlib::hint::unreachable_unchecked()
             },
         }
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_max(LevelFilter(level): LevelFilter) {
         <span class="kw">let </span>val = <span class="kw">match </span>level {
             <span class="prelude-val">Some</span>(Level(level)) =&gt; level <span class="kw">as </span>usize,
             <span class="prelude-val">None </span>=&gt; <span class="self">Self</span>::OFF_USIZE,
         };

         <span class="comment">// using an AcqRel swap ensures an ordered relationship of writes to the
         // max level.
         </span>MAX_LEVEL.swap(val, Ordering::AcqRel);
     }
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>LevelFilter {
     <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&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             LevelFilter::OFF =&gt; f.pad(<span class="string">&quot;off&quot;</span>),
             LevelFilter::ERROR =&gt; f.pad(<span class="string">&quot;error&quot;</span>),
             LevelFilter::WARN =&gt; f.pad(<span class="string">&quot;warn&quot;</span>),
             LevelFilter::INFO =&gt; f.pad(<span class="string">&quot;info&quot;</span>),
             LevelFilter::DEBUG =&gt; f.pad(<span class="string">&quot;debug&quot;</span>),
             LevelFilter::TRACE =&gt; f.pad(<span class="string">&quot;trace&quot;</span>),
         }
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>LevelFilter {
     <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&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             LevelFilter::OFF =&gt; f.pad(<span class="string">&quot;LevelFilter::OFF&quot;</span>),
             LevelFilter::ERROR =&gt; f.pad(<span class="string">&quot;LevelFilter::ERROR&quot;</span>),
             LevelFilter::WARN =&gt; f.pad(<span class="string">&quot;LevelFilter::WARN&quot;</span>),
             LevelFilter::INFO =&gt; f.pad(<span class="string">&quot;LevelFilter::INFO&quot;</span>),
             LevelFilter::DEBUG =&gt; f.pad(<span class="string">&quot;LevelFilter::DEBUG&quot;</span>),
             LevelFilter::TRACE =&gt; f.pad(<span class="string">&quot;LevelFilter::TRACE&quot;</span>),
         }
     }
 }

 <span class="kw">impl </span>FromStr <span class="kw">for </span>LevelFilter {
     <span class="kw">type </span><span class="prelude-val">Err </span>= ParseLevelFilterError;
     <span class="kw">fn </span>from_str(from: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Err&gt; {
         from.parse::&lt;usize&gt;()
             .ok()
             .and_then(|num| <span class="kw">match </span>num {
                 <span class="number">0 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::OFF),
                 <span class="number">1 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::ERROR),
                 <span class="number">2 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::WARN),
                 <span class="number">3 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::INFO),
                 <span class="number">4 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::DEBUG),
                 <span class="number">5 </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::TRACE),
                 <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
             })
             .or_else(|| <span class="kw">match </span>from {
                 <span class="string">&quot;&quot; </span>=&gt; <span class="prelude-val">Some</span>(LevelFilter::ERROR),
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;error&quot;</span>) =&gt; <span class="prelude-val">Some</span>(LevelFilter::ERROR),
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;warn&quot;</span>) =&gt; <span class="prelude-val">Some</span>(LevelFilter::WARN),
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;info&quot;</span>) =&gt; <span class="prelude-val">Some</span>(LevelFilter::INFO),
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;debug&quot;</span>) =&gt; <span class="prelude-val">Some</span>(LevelFilter::DEBUG),
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;trace&quot;</span>) =&gt; <span class="prelude-val">Some</span>(LevelFilter::TRACE),
                 s <span class="kw">if </span>s.eq_ignore_ascii_case(<span class="string">&quot;off&quot;</span>) =&gt; <span class="prelude-val">Some</span>(LevelFilter::OFF),
                 <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
             })
             .ok_or(ParseLevelFilterError(()))
     }
 }

 <span class="doccomment">/// Returned if parsing a `Level` fails.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>ParseLevelError {
     _p: (),
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>ParseLevelError {
     <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&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.pad(
             <span class="string">&quot;error parsing level: expected one of \&quot;error\&quot;, \&quot;warn\&quot;, \
              \&quot;info\&quot;, \&quot;debug\&quot;, \&quot;trace\&quot;, or a number 1-5&quot;</span>,
         )
     }
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>ParseLevelFilterError {
     <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&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.pad(
             <span class="string">&quot;error parsing level filter: expected one of \&quot;off\&quot;, \&quot;error\&quot;, \
             \&quot;warn\&quot;, \&quot;info\&quot;, \&quot;debug\&quot;, \&quot;trace\&quot;, or a number 0-5&quot;</span>,
         )
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>ParseLevelFilterError {}

 <span class="comment">// ==== Level and LevelFilter comparisons ====

 // /!\ BIG, IMPORTANT WARNING /!\
 // Do NOT mess with these implementations! They are hand-written for a reason!
 //
 // Since comparing `Level`s and `LevelFilter`s happens in a *very* hot path
 // (potentially, every time a span or event macro is hit, regardless of whether
 // or not is enabled), we *need* to ensure that these comparisons are as fast as
 // possible. Therefore, we have some requirements:
 //
 // 1. We want to do our best to ensure that rustc will generate integer-integer
 //    comparisons wherever possible.
 //
 //    The derived `Ord`/`PartialOrd` impls for `LevelFilter` will not do this,
 //    because `LevelFilter`s are represented by `Option&lt;Level&gt;`, rather than as
 //    a separate `#[repr(usize)]` enum. This was (unfortunately) necessary for
 //    backwards-compatibility reasons, as the  `tracing` crate&#39;s original
 //    version of `LevelFilter` defined `const fn` conversions between `Level`s
 //    and `LevelFilter`, so we&#39;re stuck with the `Option&lt;Level&gt;` repr.
 //    Therefore, we need hand-written `PartialOrd` impls that cast both sides of
 //    the comparison to `usize`s, to force the compiler to generate integer
 //    compares.
 //
 // 2. The hottest `Level`/`LevelFilter` comparison, the one that happens every
 //    time a callsite is hit, occurs *within the `tracing` crate&#39;s macros*.
 //    This means that the comparison is happening *inside* a crate that
 //    *depends* on `tracing-core`, not in `tracing-core` itself. The compiler
 //    will only inline function calls across crate boundaries if the called
 //    function is annotated with an `#[inline]` attribute, and we *definitely*
 //    want the comparison functions to be inlined: as previously mentioned, they
 //    should compile down to a single integer comparison on release builds, and
 //    it seems really sad to push an entire stack frame to call a function
 //    consisting of one `cmp` instruction!
 //
 //    Therefore, we need to ensure that all the comparison methods have
 //    `#[inline]` or `#[inline(always)]` attributes. It&#39;s not sufficient to just
 //    add the attribute to `partial_cmp` in a manual implementation of the
 //    trait, since it&#39;s the comparison operators (`lt`, `le`, `gt`, and `ge`)
 //    that will actually be *used*, and the default implementation of *those*
 //    methods, which calls `partial_cmp`, does not have an inline annotation.
 //
 // 3. We need the comparisons to be inverted. The discriminants for the
 //    `LevelInner` enum are assigned in &quot;backwards&quot; order, with `TRACE` having
 //    the *lowest* value. However, we want `TRACE` to compare greater-than all
 //    other levels.
 //
 //    Why are the numeric values inverted? In order to ensure that `LevelFilter`
 //    (which, as previously mentioned, *has* to be internally represented by an
 //    `Option&lt;Level&gt;`) compiles down to a single integer value. This is
 //    necessary for storing the global max in an `AtomicUsize`, and for ensuring
 //    that we use fast integer-integer comparisons, as mentioned previously. In
 //    order to ensure this, we exploit the niche optimization. The niche
 //    optimization for `Option&lt;{enum with a numeric repr}&gt;` will choose
 //    `(HIGHEST_DISCRIMINANT_VALUE + 1)` as the representation for `None`.
 //    Therefore, the integer representation of `LevelFilter::OFF` (which is
 //    `None`) will be the number 5. `OFF` must compare higher than every other
 //    level in order for it to filter as expected. Since we want to use a single
 //    `cmp` instruction, we can&#39;t special-case the integer value of `OFF` to
 //    compare higher, as that will generate more code. Instead, we need it to be
 //    on one end of the enum, with `ERROR` on the opposite end, so we assign the
 //    value 0 to `ERROR`.
 //
 //    This *does* mean that when parsing `LevelFilter`s or `Level`s from
 //    `String`s, the integer values are inverted, but that doesn&#39;t happen in a
 //    hot path.
 //
 //    Note that we manually invert the comparisons by swapping the left-hand and
 //    right-hand side. Using `Ordering::reverse` generates significantly worse
 //    code (per Matt Godbolt&#39;s Compiler Explorer).
 //
 // Anyway, that&#39;s a brief history of why this code is the way it is. Don&#39;t
 // change it unless you know what you&#39;re doing.

 </span><span class="kw">impl </span>PartialEq&lt;LevelFilter&gt; <span class="kw">for </span>Level {
     <span class="attribute">#[inline(always)]
     </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>LevelFilter) -&gt; bool {
         <span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize == filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>)
     }
 }

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

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>lt(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; bool {
         (other.<span class="number">0 </span><span class="kw">as </span>usize) &lt; (<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>le(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; bool {
         (other.<span class="number">0 </span><span class="kw">as </span>usize) &lt;= (<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>gt(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; bool {
         (other.<span class="number">0 </span><span class="kw">as </span>usize) &gt; (<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>ge(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; bool {
         (other.<span class="number">0 </span><span class="kw">as </span>usize) &gt;= (<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize)
     }
 }

 <span class="kw">impl </span>Ord <span class="kw">for </span>Level {
     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; cmp::Ordering {
         (other.<span class="number">0 </span><span class="kw">as </span>usize).cmp(<span class="kw-2">&amp;</span>(<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize))
     }
 }

 <span class="kw">impl </span>PartialOrd&lt;LevelFilter&gt; <span class="kw">for </span>Level {
     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; <span class="prelude-ty">Option</span>&lt;cmp::Ordering&gt; {
         <span class="prelude-val">Some</span>(filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>).cmp(<span class="kw-2">&amp;</span>(<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize)))
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>lt(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; bool {
         filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>) &lt; (<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>le(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; bool {
         filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>) &lt;= (<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>gt(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; bool {
         filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>) &gt; (<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>ge(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; bool {
         filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>) &gt;= (<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize)
     }
 }

 <span class="attribute">#[inline(always)]
 </span><span class="kw">fn </span>filter_as_usize(x: <span class="kw-2">&amp;</span><span class="prelude-ty">Option</span>&lt;Level&gt;) -&gt; usize {
     <span class="kw">match </span>x {
         <span class="prelude-val">Some</span>(Level(f)) =&gt; <span class="kw-2">*</span>f <span class="kw">as </span>usize,
         <span class="prelude-val">None </span>=&gt; LevelFilter::OFF_USIZE,
     }
 }

 <span class="kw">impl </span>PartialEq&lt;Level&gt; <span class="kw">for </span>LevelFilter {
     <span class="attribute">#[inline(always)]
     </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>Level) -&gt; bool {
         filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>) == other.<span class="number">0 </span><span class="kw">as </span>usize
     }
 }

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

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>lt(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; bool {
         filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>) &lt; filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>le(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; bool {
         filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>) &lt;= filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>gt(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; bool {
         filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>) &gt; filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>ge(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LevelFilter) -&gt; bool {
         filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>) &gt;= filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>)
     }
 }

 <span class="kw">impl </span>Ord <span class="kw">for </span>LevelFilter {
     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; cmp::Ordering {
         filter_as_usize(<span class="kw-2">&amp;</span>other.<span class="number">0</span>).cmp(<span class="kw-2">&amp;</span>filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>))
     }
 }

 <span class="kw">impl </span>PartialOrd&lt;Level&gt; <span class="kw">for </span>LevelFilter {
     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; <span class="prelude-ty">Option</span>&lt;cmp::Ordering&gt; {
         <span class="prelude-val">Some</span>((other.<span class="number">0 </span><span class="kw">as </span>usize).cmp(<span class="kw-2">&amp;</span>filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>)))
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>lt(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; bool {
         (other.<span class="number">0 </span><span class="kw">as </span>usize) &lt; filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>le(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; bool {
         (other.<span class="number">0 </span><span class="kw">as </span>usize) &lt;= filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>gt(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; bool {
         (other.<span class="number">0 </span><span class="kw">as </span>usize) &gt; filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>)
     }

     <span class="attribute">#[inline(always)]
     </span><span class="kw">fn </span>ge(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Level) -&gt; bool {
         (other.<span class="number">0 </span><span class="kw">as </span>usize) &gt;= filter_as_usize(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>)
     }
 }

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use super</span>::<span class="kw-2">*</span>;
     <span class="kw">use </span><span class="kw">crate</span>::stdlib::mem;

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>level_from_str() {
         <span class="macro">assert_eq!</span>(<span class="string">&quot;error&quot;</span>.parse::&lt;Level&gt;().unwrap(), Level::ERROR);
         <span class="macro">assert_eq!</span>(<span class="string">&quot;4&quot;</span>.parse::&lt;Level&gt;().unwrap(), Level::DEBUG);
         <span class="macro">assert!</span>(<span class="string">&quot;0&quot;</span>.parse::&lt;Level&gt;().is_err())
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>filter_level_conversion() {
         <span class="kw">let </span>mapping = [
             (LevelFilter::OFF, <span class="prelude-val">None</span>),
             (LevelFilter::ERROR, <span class="prelude-val">Some</span>(Level::ERROR)),
             (LevelFilter::WARN, <span class="prelude-val">Some</span>(Level::WARN)),
             (LevelFilter::INFO, <span class="prelude-val">Some</span>(Level::INFO)),
             (LevelFilter::DEBUG, <span class="prelude-val">Some</span>(Level::DEBUG)),
             (LevelFilter::TRACE, <span class="prelude-val">Some</span>(Level::TRACE)),
         ];
         <span class="kw">for </span>(filter, level) <span class="kw">in </span>mapping.iter() {
             <span class="macro">assert_eq!</span>(filter.into_level(), <span class="kw-2">*</span>level);
             <span class="kw">match </span>level {
                 <span class="prelude-val">Some</span>(level) =&gt; {
                     <span class="kw">let </span>actual: LevelFilter = (<span class="kw-2">*</span>level).into();
                     <span class="macro">assert_eq!</span>(actual, <span class="kw-2">*</span>filter);
                 }
                 <span class="prelude-val">None </span>=&gt; {
                     <span class="kw">let </span>actual: LevelFilter = <span class="prelude-val">None</span>.into();
                     <span class="macro">assert_eq!</span>(actual, <span class="kw-2">*</span>filter);
                 }
             }
         }
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>level_filter_is_usize_sized() {
         <span class="macro">assert_eq!</span>(
             mem::size_of::&lt;LevelFilter&gt;(),
             mem::size_of::&lt;usize&gt;(),
             <span class="string">&quot;`LevelFilter` is no longer `usize`-sized! global MAX_LEVEL may now be invalid!&quot;
         </span>)
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>level_filter_reprs() {
         <span class="kw">let </span>mapping = [
             (LevelFilter::OFF, LevelInner::Error <span class="kw">as </span>usize + <span class="number">1</span>),
             (LevelFilter::ERROR, LevelInner::Error <span class="kw">as </span>usize),
             (LevelFilter::WARN, LevelInner::Warn <span class="kw">as </span>usize),
             (LevelFilter::INFO, LevelInner::Info <span class="kw">as </span>usize),
             (LevelFilter::DEBUG, LevelInner::Debug <span class="kw">as </span>usize),
             (LevelFilter::TRACE, LevelInner::Trace <span class="kw">as </span>usize),
         ];
         <span class="kw">for </span><span class="kw-2">&amp;</span>(filter, expected) <span class="kw">in </span><span class="kw-2">&amp;</span>mapping {
             <span class="kw">let </span>repr = <span class="kw">unsafe </span>{
                 <span class="comment">// safety: The entire purpose of this test is to assert that the
                 // actual repr matches what we expect it to be --- we&#39;re testing
                 // that *other* unsafe code is sound using the transmuted value.
                 // We&#39;re not going to do anything with it that might be unsound.
                 </span>mem::transmute::&lt;LevelFilter, usize&gt;(filter)
             };
             <span class="macro">assert_eq!</span>(expected, repr, <span class="string">&quot;repr changed for {:?}&quot;</span>, filter)
         }
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="tracing_core" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>