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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="A writer intended to support `libtest`s output capturing for use in unit tests."><title>TestWriter in tracing_subscriber::fmt - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tracing_subscriber" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing_subscriber/index.html">tracing_subscriber</a><span class="version">0.3.18</span></h2></div><h2 class="location"><a href="#">TestWriter</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.new">new</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-TestWriter">Debug</a></li><li><a href="#impl-Default-for-TestWriter">Default</a></li><li><a href="#impl-MakeWriter%3C'a%3E-for-TestWriter">MakeWriter&lt;&#x27;a&gt;</a></li><li><a href="#impl-Write-for-TestWriter">Write</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-TestWriter">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-TestWriter">RefUnwindSafe</a></li><li><a href="#impl-Send-for-TestWriter">Send</a></li><li><a href="#impl-Sync-for-TestWriter">Sync</a></li><li><a href="#impl-Unpin-for-TestWriter">Unpin</a></li><li><a href="#impl-UnwindSafe-for-TestWriter">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow&lt;T&gt;</a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut&lt;T&gt;</a></li><li><a href="#impl-From%3CT%3E-for-T">From&lt;T&gt;</a></li><li><a href="#impl-Instrument-for-T">Instrument</a></li><li><a href="#impl-Into%3CU%3E-for-T">Into&lt;U&gt;</a></li><li><a href="#impl-MakeWriterExt%3C'a%3E-for-M">MakeWriterExt&lt;&#x27;a&gt;</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom&lt;U&gt;</a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto&lt;U&gt;</a></li><li><a href="#impl-WithSubscriber-for-T">WithSubscriber</a></li></ul></section><h2><a href="index.html">In tracing_subscriber::fmt</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Struct <a href="../index.html">tracing_subscriber</a>::<wbr><a href="index.html">fmt</a>::<wbr><a class="struct" href="#">TestWriter</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/tracing_subscriber/fmt/writer.rs.html#511-513">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub struct TestWriter { <span class="comment">/* private fields */</span> }</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A writer intended to support <a href="https://doc.rust-lang.org/book/ch11-02-running-tests.html#showing-function-output"><code>libtest</code>s output capturing</a> for use in unit tests.</p>
<p><code>TestWriter</code> is used by <a href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber"><code>fmt::Subscriber</code></a> or <a href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer"><code>fmt::Layer</code></a> to enable capturing support.</p>
<p><code>cargo test</code> can only capture output from the standard librarys <a href="https://doc.rust-lang.org/1.80.0/std/macro.print.html" title="macro std::print"><code>print!</code></a> macro. See
<a href="https://doc.rust-lang.org/book/ch11-02-running-tests.html#showing-function-output"><code>libtest</code>s output capturing</a> for more details about output capturing.</p>
<p>Writing to <a href="https://doc.rust-lang.org/1.80.0/std/io/stdio/fn.stdout.html" title="fn std::io::stdio::stdout"><code>io::stdout</code></a> and <a href="https://doc.rust-lang.org/1.80.0/std/io/stdio/fn.stderr.html" title="fn std::io::stdio::stderr"><code>io::stderr</code></a> produces the same results as using
<a href="https://doc.rust-lang.org/cargo/commands/cargo-test.html"><code>libtest</code>s <code>--nocapture</code> option</a> which may make the results look unreadable.</p>
</div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-TestWriter" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#703-708">source</a><a href="#impl-TestWriter" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#705-707">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>() -&gt; Self</h4></section></summary><div class="docblock"><p>Returns a new <code>TestWriter</code> with the default configuration.</p>
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-TestWriter" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#510">source</a><a href="#impl-Debug-for-TestWriter" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#510">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.80.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-TestWriter" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#510">source</a><a href="#impl-Default-for-TestWriter" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.default" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#510">source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -&gt; <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a> <a href="#" class="tooltip" data-notable-ty="TestWriter"></a></h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a href="https://doc.rust-lang.org/1.80.0/core/default/trait.Default.html#tymethod.default">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-MakeWriter%3C'a%3E-for-TestWriter" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#722-728">source</a><a href="#impl-MakeWriter%3C'a%3E-for-TestWriter" class="anchor">§</a><h3 class="code-header">impl&lt;'a&gt; <a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">MakeWriter</a>&lt;'a&gt; for <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Writer" class="associatedtype trait-impl"><a href="#associatedtype.Writer" class="anchor">§</a><h4 class="code-header">type <a href="trait.MakeWriter.html#associatedtype.Writer" class="associatedtype">Writer</a> = <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h4></section></summary><div class='docblock'>The concrete <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html" title="trait std::io::Write"><code>io::Write</code></a> implementation returned by <a href="trait.MakeWriter.html#tymethod.make_writer" title="method tracing_subscriber::fmt::MakeWriter::make_writer"><code>make_writer</code></a>.</div></details><details class="toggle method-toggle" open><summary><section id="method.make_writer" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#725-727">source</a><a href="#method.make_writer" class="anchor">§</a><h4 class="code-header">fn <a href="trait.MakeWriter.html#tymethod.make_writer" class="fn">make_writer</a>(&amp;'a self) -&gt; Self::<a class="associatedtype" href="trait.MakeWriter.html#associatedtype.Writer" title="type tracing_subscriber::fmt::MakeWriter::Writer">Writer</a></h4></section></summary><div class='docblock'>Returns an instance of <a href="trait.MakeWriter.html#associatedtype.Writer" title="associated type tracing_subscriber::fmt::MakeWriter::Writer"><code>Writer</code></a>. <a href="trait.MakeWriter.html#tymethod.make_writer">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.make_writer_for" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#205-208">source</a><a href="#method.make_writer_for" class="anchor">§</a><h4 class="code-header">fn <a href="trait.MakeWriter.html#method.make_writer_for" class="fn">make_writer_for</a>(&amp;'a self, meta: &amp;<a class="struct" href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a>&lt;'_&gt;) -&gt; Self::<a class="associatedtype" href="trait.MakeWriter.html#associatedtype.Writer" title="type tracing_subscriber::fmt::MakeWriter::Writer">Writer</a></h4></section></summary><div class='docblock'>Returns a <a href="trait.MakeWriter.html#associatedtype.Writer" title="associated type tracing_subscriber::fmt::MakeWriter::Writer"><code>Writer</code></a> for writing data from the span or event described
by the provided <a href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata"><code>Metadata</code></a>. <a href="trait.MakeWriter.html#method.make_writer_for">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Write-for-TestWriter" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#710-720">source</a><a href="#impl-Write-for-TestWriter" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.write" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#711-715">source</a><a href="#method.write" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#tymethod.write" class="fn">write</a>(&amp;mut self, buf: &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.u8.html">u8</a>]) -&gt; <a class="type" href="https://doc.rust-lang.org/1.80.0/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>&gt;</h4></section></summary><div class='docblock'>Write a buffer into this writer, returning how many bytes were written. <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#tymethod.write">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.flush" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#717-719">source</a><a href="#method.flush" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#tymethod.flush" class="fn">flush</a>(&amp;mut self) -&gt; <a class="type" href="https://doc.rust-lang.org/1.80.0/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>&gt;</h4></section></summary><div class='docblock'>Flush this output stream, ensuring that all intermediately buffered
contents reach their destination. <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#tymethod.flush">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.write_vectored" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.36.0">1.36.0</span> · <a class="src" href="https://doc.rust-lang.org/1.80.0/src/std/io/mod.rs.html#1622">source</a></span><a href="#method.write_vectored" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.write_vectored" class="fn">write_vectored</a>(&amp;mut self, bufs: &amp;[<a class="struct" href="https://doc.rust-lang.org/1.80.0/std/io/struct.IoSlice.html" title="struct std::io::IoSlice">IoSlice</a>&lt;'_&gt;]) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>, <a class="struct" href="https://doc.rust-lang.org/1.80.0/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Like <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#tymethod.write" title="method std::io::Write::write"><code>write</code></a>, except that it writes from a slice of buffers. <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.write_vectored">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.is_write_vectored" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/std/io/mod.rs.html#1637">source</a><a href="#method.is_write_vectored" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.is_write_vectored" class="fn">is_write_vectored</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>can_vector</code>&nbsp;<a href="https://github.com/tokio-rs/tracing/issues/69941">#69941</a>)</span></div></span><div class='docblock'>Determines if this <code>Write</code>r has an efficient <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.write_vectored" title="method std::io::Write::write_vectored"><code>write_vectored</code></a>
implementation. <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.is_write_vectored">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.write_all" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.80.0/src/std/io/mod.rs.html#1699">source</a></span><a href="#method.write_all" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.write_all" class="fn">write_all</a>(&amp;mut self, buf: &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.u8.html">u8</a>]) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.80.0/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Attempts to write an entire buffer into this writer. <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.write_all">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.write_all_vectored" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/std/io/mod.rs.html#1761">source</a><a href="#method.write_all_vectored" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.write_all_vectored" class="fn">write_all_vectored</a>(&amp;mut self, bufs: &amp;mut [<a class="struct" href="https://doc.rust-lang.org/1.80.0/std/io/struct.IoSlice.html" title="struct std::io::IoSlice">IoSlice</a>&lt;'_&gt;]) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.80.0/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>write_all_vectored</code>&nbsp;<a href="https://github.com/tokio-rs/tracing/issues/70436">#70436</a>)</span></div></span><div class='docblock'>Attempts to write multiple buffers into this writer. <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.write_all_vectored">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.write_fmt" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.80.0/src/std/io/mod.rs.html#1814">source</a></span><a href="#method.write_fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.write_fmt" class="fn">write_fmt</a>(&amp;mut self, fmt: <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/fmt/struct.Arguments.html" title="struct core::fmt::Arguments">Arguments</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.80.0/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Writes a formatted string into this writer, returning any error
encountered. <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.write_fmt">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.by_ref" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.80.0/src/std/io/mod.rs.html#1874-1876">source</a></span><a href="#method.by_ref" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.by_ref" class="fn">by_ref</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;mut Self</a><div class="where">where
Self: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class='docblock'>Creates a “by reference” adapter for this instance of <code>Write</code>. <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html#method.by_ref">Read more</a></div></details></div></details></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-TestWriter" class="impl"><a href="#impl-Freeze-for-TestWriter" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section><section id="impl-RefUnwindSafe-for-TestWriter" class="impl"><a href="#impl-RefUnwindSafe-for-TestWriter" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section><section id="impl-Send-for-TestWriter" class="impl"><a href="#impl-Send-for-TestWriter" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section><section id="impl-Sync-for-TestWriter" class="impl"><a href="#impl-Sync-for-TestWriter" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section><section id="impl-Unpin-for-TestWriter" class="impl"><a href="#impl-Unpin-for-TestWriter" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section><section id="impl-UnwindSafe-for-TestWriter" class="impl"><a href="#impl-UnwindSafe-for-TestWriter" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/any.rs.html#141">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#210">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#217">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Instrument-for-T" class="impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#325">source</a><a href="#impl-Instrument-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="../../tracing/instrument/trait.Instrument.html" title="trait tracing::instrument::Instrument">Instrument</a> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.instrument" class="method trait-impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#86">source</a><a href="#method.instrument" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.Instrument.html#method.instrument" class="fn">instrument</a>(self, span: <a class="struct" href="../../tracing/span/struct.Span.html" title="struct tracing::span::Span">Span</a>) -&gt; <a class="struct" href="../../tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a>&lt;Self&gt;</h4></section></summary><div class='docblock'>Instruments this type with the provided <a href="../../tracing/span/struct.Span.html" title="struct tracing::span::Span"><code>Span</code></a>, returning an
<code>Instrumented</code> wrapper. <a href="../../tracing/instrument/trait.Instrument.html#method.instrument">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.in_current_span" class="method trait-impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#128">source</a><a href="#method.in_current_span" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.Instrument.html#method.in_current_span" class="fn">in_current_span</a>(self) -&gt; <a class="struct" href="../../tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a>&lt;Self&gt;</h4></section></summary><div class='docblock'>Instruments this type with the <a href="../../tracing/span/struct.Span.html#method.current" title="associated function tracing::span::Span::current">current</a> <a href="../../tracing/span/struct.Span.html" title="struct tracing::span::Span"><code>Span</code></a>, returning an
<code>Instrumented</code> wrapper. <a href="../../tracing/instrument/trait.Instrument.html#method.in_current_span">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -&gt; U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
<p>That is, this conversion is whatever the implementation of
<code><a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for U</code> chooses to do.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-MakeWriterExt%3C'a%3E-for-M" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#1201">source</a><a href="#impl-MakeWriterExt%3C'a%3E-for-M" class="anchor">§</a><h3 class="code-header">impl&lt;'a, M&gt; <a class="trait" href="writer/trait.MakeWriterExt.html" title="trait tracing_subscriber::fmt::writer::MakeWriterExt">MakeWriterExt</a>&lt;'a&gt; for M<div class="where">where
M: <a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">MakeWriter</a>&lt;'a&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with_max_level" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#276-281">source</a><a href="#method.with_max_level" class="anchor">§</a><h4 class="code-header">fn <a href="writer/trait.MakeWriterExt.html#method.with_max_level" class="fn">with_max_level</a>(self, level: <a class="struct" href="../../tracing_core/metadata/struct.Level.html" title="struct tracing_core::metadata::Level">Level</a>) -&gt; <a class="struct" href="writer/struct.WithMaxLevel.html" title="struct tracing_subscriber::fmt::writer::WithMaxLevel">WithMaxLevel</a>&lt;Self&gt;<div class="where">where
Self: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class='docblock'>Wraps <code>self</code> and returns a <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> that will only write output
for events at or below the provided verbosity <a href="../../tracing_core/metadata/struct.Level.html" title="struct tracing_core::metadata::Level"><code>Level</code></a>. For instance,
<code>Level::TRACE</code> is considered to be _more verbose<code>than</code>Level::INFO`. <a href="writer/trait.MakeWriterExt.html#method.with_max_level">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.with_min_level" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#318-323">source</a><a href="#method.with_min_level" class="anchor">§</a><h4 class="code-header">fn <a href="writer/trait.MakeWriterExt.html#method.with_min_level" class="fn">with_min_level</a>(self, level: <a class="struct" href="../../tracing_core/metadata/struct.Level.html" title="struct tracing_core::metadata::Level">Level</a>) -&gt; <a class="struct" href="writer/struct.WithMinLevel.html" title="struct tracing_subscriber::fmt::writer::WithMinLevel">WithMinLevel</a>&lt;Self&gt;<div class="where">where
Self: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class='docblock'>Wraps <code>self</code> and returns a <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> that will only write output
for events at or above the provided verbosity <a href="../../tracing_core/metadata/struct.Level.html" title="struct tracing_core::metadata::Level"><code>Level</code></a>. <a href="writer/trait.MakeWriterExt.html#method.with_min_level">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.with_filter" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#397-403">source</a><a href="#method.with_filter" class="anchor">§</a><h4 class="code-header">fn <a href="writer/trait.MakeWriterExt.html#method.with_filter" class="fn">with_filter</a>&lt;F&gt;(self, filter: F) -&gt; <a class="struct" href="writer/struct.WithFilter.html" title="struct tracing_subscriber::fmt::writer::WithFilter">WithFilter</a>&lt;Self, F&gt;<div class="where">where
Self: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
F: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(&amp;<a class="struct" href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a>&lt;'_&gt;) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class='docblock'>Wraps <code>self</code> with a predicate that takes a span or events <a href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata"><code>Metadata</code></a>
and returns a <code>bool</code>. The returned <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a>s
<a href="trait.MakeWriter.html#method.make_writer_for" title="method tracing_subscriber::fmt::MakeWriter::make_writer_for"><code>MakeWriter::make_writer_for</code></a> method will check the predicate to
determine if a writer should be produced for a given span or event. <a href="writer/trait.MakeWriterExt.html#method.with_filter">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.and" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#452-458">source</a><a href="#method.and" class="anchor">§</a><h4 class="code-header">fn <a href="writer/trait.MakeWriterExt.html#method.and" class="fn">and</a>&lt;B&gt;(self, other: B) -&gt; <a class="struct" href="writer/struct.Tee.html" title="struct tracing_subscriber::fmt::writer::Tee">Tee</a>&lt;Self, B&gt; <a href="#" class="tooltip" data-notable-ty="Tee&lt;Self, B&gt;"></a><div class="where">where
Self: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
B: <a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">MakeWriter</a>&lt;'a&gt; + <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class='docblock'>Combines <code>self</code> with another type implementing <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a>, returning
a new <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> that produces <a href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html" title="trait std::io::Write">writers</a> that write to <em>both</em>
outputs. <a href="writer/trait.MakeWriterExt.html#method.and">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.or_else" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/writer.rs.html#483-490">source</a><a href="#method.or_else" class="anchor">§</a><h4 class="code-header">fn <a href="writer/trait.MakeWriterExt.html#method.or_else" class="fn">or_else</a>&lt;W, B&gt;(self, other: B) -&gt; <a class="struct" href="writer/struct.OrElse.html" title="struct tracing_subscriber::fmt::writer::OrElse">OrElse</a>&lt;Self, B&gt;<div class="where">where
Self: <a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">MakeWriter</a>&lt;'a, Writer = <a class="type" href="writer/type.OptionalWriter.html" title="type tracing_subscriber::fmt::writer::OptionalWriter">OptionalWriter</a>&lt;W&gt;&gt; + <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
B: <a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">MakeWriter</a>&lt;'a&gt; + <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
W: <a class="trait" href="https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html" title="trait std::io::Write">Write</a>,</div></h4></section></summary><div class='docblock'>Combines <code>self</code> with another type implementing <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a>, returning
a new <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> that calls <code>other</code>s <a href="trait.MakeWriter.html#tymethod.make_writer" title="method tracing_subscriber::fmt::MakeWriter::make_writer"><code>make_writer</code></a> if <code>self</code>s
<code>make_writer</code> returns <a href="writer/enum.EitherWriter.html#method.none" title="associated function tracing_subscriber::fmt::writer::EitherWriter::none"><code>OptionalWriter::none</code></a>. <a href="writer/trait.MakeWriterExt.html#method.or_else">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-WithSubscriber-for-T" class="impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#393">source</a><a href="#impl-WithSubscriber-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="../../tracing/instrument/trait.WithSubscriber.html" title="trait tracing::instrument::WithSubscriber">WithSubscriber</a> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with_subscriber" class="method trait-impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#176-178">source</a><a href="#method.with_subscriber" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_subscriber" class="fn">with_subscriber</a>&lt;S&gt;(self, subscriber: S) -&gt; <a class="struct" href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a>&lt;Self&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="../../tracing_core/dispatcher/struct.Dispatch.html" title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>&gt;,</div></h4></section></summary><div class='docblock'>Attaches the provided <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> to this type, returning a
<a href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_subscriber">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.with_current_subscriber" class="method trait-impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#228">source</a><a href="#method.with_current_subscriber" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_current_subscriber" class="fn">with_current_subscriber</a>(self) -&gt; <a class="struct" href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a>&lt;Self&gt;</h4></section></summary><div class='docblock'>Attaches the current <a href="../../tracing/dispatcher/index.html#setting-the-default-subscriber" title="mod tracing::dispatcher">default</a> <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> to this type, returning a
<a href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_current_subscriber">Read more</a></div></details></div></details></div><script type="text/json" id="notable-traits-data">{"Tee<Self, B>":"<h3>Notable traits for <code><a class=\"struct\" href=\"writer/struct.Tee.html\" title=\"struct tracing_subscriber::fmt::writer::Tee\">Tee</a>&lt;A, B&gt;</code></h3><pre><code><div class=\"where\">impl&lt;A, B&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html\" title=\"trait std::io::Write\">Write</a> for <a class=\"struct\" href=\"writer/struct.Tee.html\" title=\"struct tracing_subscriber::fmt::writer::Tee\">Tee</a>&lt;A, B&gt;<div class=\"where\">where\n A: <a class=\"trait\" href=\"https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html\" title=\"trait std::io::Write\">Write</a>,\n B: <a class=\"trait\" href=\"https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html\" title=\"trait std::io::Write\">Write</a>,</div></div>","TestWriter":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.TestWriter.html\" title=\"struct tracing_subscriber::fmt::TestWriter\">TestWriter</a></code></h3><pre><code><div class=\"where\">impl <a class=\"trait\" href=\"https://doc.rust-lang.org/1.80.0/std/io/trait.Write.html\" title=\"trait std::io::Write\">Write</a> for <a class=\"struct\" href=\"struct.TestWriter.html\" title=\"struct tracing_subscriber::fmt::TestWriter\">TestWriter</a></div>"}</script></section></div></main></body></html>