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<p class='location'>Struct Chain</p><div class="block items"><ul><li><a href="#methods">Methods</a></li><li><a href="#implementations">Trait Implementations</a></li></ul></div><p class='location'><a href='../index.html'>std</a>::<wbr><a href='index.html'>io</a></p><script>window.sidebarCurrent = {name: 'Chain', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>std</a>::<wbr><a href='index.html'>io</a>::<wbr><a class="struct" href=''>Chain</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/std/io/mod.rs.html#1503-1507' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct Chain<T, U> { /* fields omitted */ }</pre><div class='docblock'><p>Adaptor to chain together two readers.</p>
<p>This struct is generally created by calling <a href="trait.Read.html#method.chain"><code>chain</code></a> on a reader.
Please see the documentation of <a href="trait.Read.html#method.chain"><code>chain</code></a> for more details.</p>
</div><h2 id='methods'>Methods</h2><h3 class='impl'><span class='in-band'><code>impl<T, U> <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1509-1588' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.into_inner' class="method"><span id='into_inner.v' class='invisible'><code>fn <a href='#method.into_inner' class='fnname'>into_inner</a>(self) -> <a class="primitive" href="../primitive.tuple.html">(</a>T, U<a class="primitive" href="../primitive.tuple.html">)</a></code></span></h4>
<div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>more_io_inner_methods </code><a href="https://github.com/rust-lang/rust/issues/41519">#41519</a>)</div></div><div class='docblock'><p>Consumes the <code>Chain</code>, returning the wrapped readers.</p>
<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="attribute">#<span class="op">!</span>[<span class="ident">feature</span>(<span class="ident">more_io_inner_methods</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">foo_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"foo.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bar_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"bar.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">chain</span> <span class="op">=</span> <span class="ident">foo_file</span>.<span class="ident">chain</span>(<span class="ident">bar_file</span>);
<span class="kw">let</span> (<span class="ident">foo_file</span>, <span class="ident">bar_file</span>) <span class="op">=</span> <span class="ident">chain</span>.<span class="ident">into_inner</span>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Bfeature(more_io_inner_methods)%5D%0A%0Afn%20main()%20%7B%0Ause%20std%3A%3Aio%3B%0Ause%20std%3A%3Aio%3A%3Aprelude%3A%3A*%3B%0Ause%20std%3A%3Afs%3A%3AFile%3B%0A%0Afn%20foo()%20-%3E%20io%3A%3AResult%3C()%3E%20%7B%0Alet%20mut%20foo_file%20%3D%20File%3A%3Aopen(%22foo.txt%22)%3F%3B%0Alet%20mut%20bar_file%20%3D%20File%3A%3Aopen(%22bar.txt%22)%3F%3B%0A%0Alet%20chain%20%3D%20foo_file.chain(bar_file)%3B%0Alet%20(foo_file%2C%20bar_file)%20%3D%20chain.into_inner()%3B%0AOk(())%0A%7D%0A%7D&version=nightly">Run</a></pre>
</div><h4 id='method.get_ref' class="method"><span id='get_ref.v' class='invisible'><code>fn <a href='#method.get_ref' class='fnname'>get_ref</a>(&self) -> <a class="primitive" href="../primitive.tuple.html">(</a>&T, &U<a class="primitive" href="../primitive.tuple.html">)</a></code></span></h4>
<div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>more_io_inner_methods </code><a href="https://github.com/rust-lang/rust/issues/41519">#41519</a>)</div></div><div class='docblock'><p>Gets references to the underlying readers in this <code>Chain</code>.</p>
<h1 id='examples-1' class='section-header'><a href='#examples-1'>Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="attribute">#<span class="op">!</span>[<span class="ident">feature</span>(<span class="ident">more_io_inner_methods</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">foo_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"foo.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bar_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"bar.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">chain</span> <span class="op">=</span> <span class="ident">foo_file</span>.<span class="ident">chain</span>(<span class="ident">bar_file</span>);
<span class="kw">let</span> (<span class="ident">foo_file</span>, <span class="ident">bar_file</span>) <span class="op">=</span> <span class="ident">chain</span>.<span class="ident">get_ref</span>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Bfeature(more_io_inner_methods)%5D%0A%0Afn%20main()%20%7B%0Ause%20std%3A%3Aio%3B%0Ause%20std%3A%3Aio%3A%3Aprelude%3A%3A*%3B%0Ause%20std%3A%3Afs%3A%3AFile%3B%0A%0Afn%20foo()%20-%3E%20io%3A%3AResult%3C()%3E%20%7B%0Alet%20mut%20foo_file%20%3D%20File%3A%3Aopen(%22foo.txt%22)%3F%3B%0Alet%20mut%20bar_file%20%3D%20File%3A%3Aopen(%22bar.txt%22)%3F%3B%0A%0Alet%20chain%20%3D%20foo_file.chain(bar_file)%3B%0Alet%20(foo_file%2C%20bar_file)%20%3D%20chain.get_ref()%3B%0AOk(())%0A%7D%0A%7D&version=nightly">Run</a></pre>
</div><h4 id='method.get_mut' class="method"><span id='get_mut.v' class='invisible'><code>fn <a href='#method.get_mut' class='fnname'>get_mut</a>(&mut self) -> <a class="primitive" href="../primitive.tuple.html">(</a>&mut T, &mut U<a class="primitive" href="../primitive.tuple.html">)</a></code></span></h4>
<div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>more_io_inner_methods </code><a href="https://github.com/rust-lang/rust/issues/41519">#41519</a>)</div></div><div class='docblock'><p>Gets mutable references to the underlying readers in this <code>Chain</code>.</p>
<p>Care should be taken to avoid modifying the internal I/O state of the
underlying readers as doing so may corrupt the internal state of this
<code>Chain</code>.</p>
<h1 id='examples-2' class='section-header'><a href='#examples-2'>Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="attribute">#<span class="op">!</span>[<span class="ident">feature</span>(<span class="ident">more_io_inner_methods</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">foo_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"foo.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bar_file</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"bar.txt"</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chain</span> <span class="op">=</span> <span class="ident">foo_file</span>.<span class="ident">chain</span>(<span class="ident">bar_file</span>);
<span class="kw">let</span> (<span class="ident">foo_file</span>, <span class="ident">bar_file</span>) <span class="op">=</span> <span class="ident">chain</span>.<span class="ident">get_mut</span>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Bfeature(more_io_inner_methods)%5D%0A%0Afn%20main()%20%7B%0Ause%20std%3A%3Aio%3B%0Ause%20std%3A%3Aio%3A%3Aprelude%3A%3A*%3B%0Ause%20std%3A%3Afs%3A%3AFile%3B%0A%0Afn%20foo()%20-%3E%20io%3A%3AResult%3C()%3E%20%7B%0Alet%20mut%20foo_file%20%3D%20File%3A%3Aopen(%22foo.txt%22)%3F%3B%0Alet%20mut%20bar_file%20%3D%20File%3A%3Aopen(%22bar.txt%22)%3F%3B%0A%0Alet%20mut%20chain%20%3D%20foo_file.chain(bar_file)%3B%0Alet%20(foo_file%2C%20bar_file)%20%3D%20chain.get_mut()%3B%0AOk(())%0A%7D%0A%7D&version=nightly">Run</a></pre>
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../std/fmt/trait.Debug.html" title="trait std::fmt::Debug">Debug</a>, U: <a class="trait" href="../../std/fmt/trait.Debug.html" title="trait std::fmt::Debug">Debug</a>> <a class="trait" href="../../std/fmt/trait.Debug.html" title="trait std::fmt::Debug">Debug</a> for <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.16.0'>1.16.0</div><a class='srclink' href='../../src/std/io/mod.rs.html#1591-1598' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='../../std/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="../../std/fmt/struct.Formatter.html" title="struct std::fmt::Formatter">Formatter</a>) -> <a class="type" href="../../std/fmt/type.Result.html" title="type std::fmt::Result">Result</a></code></span></h4>
<div class='docblock'><p>Formats the value using the given formatter.</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>, U: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>> <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/std/io/mod.rs.html#1601-1611' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.read' class="method"><span id='read.v' class='invisible'><code>fn <a href='../../std/io/trait.Read.html#tymethod.read' class='fnname'>read</a>(&mut self, buf: <a class="primitive" href="../primitive.slice.html">&mut [</a><a class="primitive" href="../primitive.u8.html">u8</a><a class="primitive" href="../primitive.slice.html">]</a>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.usize.html">usize</a>></code></span></h4>
<div class='docblock'><p>Pull some bytes from this source into the specified buffer, returning how many bytes were read. <a href="../../std/io/trait.Read.html#tymethod.read">Read more</a></p>
</div><h4 id='method.read_to_end' class="method"><span id='read_to_end.v' class='invisible'><code>fn <a href='../../std/io/trait.Read.html#method.read_to_end' class='fnname'>read_to_end</a>(&mut self, buf: &mut <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><<a class="primitive" href="../primitive.u8.html">u8</a>>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.usize.html">usize</a>></code></span></h4>
<div class='docblock'><p>Read all bytes until EOF in this source, placing them into <code>buf</code>. <a href="../../std/io/trait.Read.html#method.read_to_end">Read more</a></p>
</div><h4 id='method.read_to_string' class="method"><span id='read_to_string.v' class='invisible'><code>fn <a href='../../std/io/trait.Read.html#method.read_to_string' class='fnname'>read_to_string</a>(&mut self, buf: &mut <a class="struct" href="../../std/string/struct.String.html" title="struct std::string::String">String</a>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.usize.html">usize</a>></code></span></h4>
<div class='docblock'><p>Read all bytes until EOF in this source, placing them into <code>buf</code>. <a href="../../std/io/trait.Read.html#method.read_to_string">Read more</a></p>
</div><h4 id='method.read_exact' class="method"><span id='read_exact.v' class='invisible'><code>fn <a href='../../std/io/trait.Read.html#method.read_exact' class='fnname'>read_exact</a>(&mut self, buf: <a class="primitive" href="../primitive.slice.html">&mut [</a><a class="primitive" href="../primitive.u8.html">u8</a><a class="primitive" href="../primitive.slice.html">]</a>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.tuple.html">()</a>></code><div class='since' title='Stable since Rust version 1.6.0'>1.6.0</div></span></h4>
<div class='docblock'><p>Read the exact number of bytes required to fill <code>buf</code>. <a href="../../std/io/trait.Read.html#method.read_exact">Read more</a></p>
</div><h4 id='method.by_ref' class="method"><span id='by_ref.v' class='invisible'><code>fn <a href='../../std/io/trait.Read.html#method.by_ref' class='fnname'>by_ref</a>(&mut self) -> &mut Self <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></h4>
<div class='docblock'><p>Creates a "by reference" adaptor for this instance of <code>Read</code>. <a href="../../std/io/trait.Read.html#method.by_ref">Read more</a></p>
</div><h4 id='method.bytes' class="method"><span id='bytes.v' class='invisible'><code>fn <a href='../../std/io/trait.Read.html#method.bytes' class='fnname'>bytes</a>(self) -> <a class="struct" href="../../std/io/struct.Bytes.html" title="struct std::io::Bytes">Bytes</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></h4>
<div class='docblock'><p>Transforms this <code>Read</code> instance to an <code>Iterator</code> over its bytes. <a href="../../std/io/trait.Read.html#method.bytes">Read more</a></p>
</div><h4 id='method.chars' class="method"><span id='chars.v' class='invisible'><code>fn <a href='../../std/io/trait.Read.html#method.chars' class='fnname'>chars</a>(self) -> <a class="struct" href="../../std/io/struct.Chars.html" title="struct std::io::Chars">Chars</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></h4>
<div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>io </code><a href="https://github.com/rust-lang/rust/issues/27802">#27802</a>)</summary><p>the semantics of a partial read/write of where errors happen is currently unclear and may change</p>
</details></div></div><div class='docblock'><p>Transforms this <code>Read</code> instance to an <code>Iterator</code> over <code>char</code>s. <a href="../../std/io/trait.Read.html#method.chars">Read more</a></p>
</div><h4 id='method.chain' class="method"><span id='chain.v' class='invisible'><code>fn <a href='../../std/io/trait.Read.html#method.chain' class='fnname'>chain</a><R: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a>>(self, next: R) -> <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><Self, R> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></h4>
<div class='docblock'><p>Creates an adaptor which will chain this stream with another. <a href="../../std/io/trait.Read.html#method.chain">Read more</a></p>
</div><h4 id='method.take' class="method"><span id='take.v' class='invisible'><code>fn <a href='../../std/io/trait.Read.html#method.take' class='fnname'>take</a>(self, limit: <a class="primitive" href="../primitive.u64.html">u64</a>) -> <a class="struct" href="../../std/io/struct.Take.html" title="struct std::io::Take">Take</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></h4>
<div class='docblock'><p>Creates an adaptor which will read at most <code>limit</code> bytes from it. <a href="../../std/io/trait.Read.html#method.take">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../std/io/trait.BufRead.html" title="trait std::io::BufRead">BufRead</a>, U: <a class="trait" href="../../std/io/trait.BufRead.html" title="trait std::io::BufRead">BufRead</a>> <a class="trait" href="../../std/io/trait.BufRead.html" title="trait std::io::BufRead">BufRead</a> for <a class="struct" href="../../std/io/struct.Chain.html" title="struct std::io::Chain">Chain</a><T, U></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div><a class='srclink' href='../../src/std/io/mod.rs.html#1614-1632' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.fill_buf' class="method"><span id='fill_buf.v' class='invisible'><code>fn <a href='../../std/io/trait.BufRead.html#tymethod.fill_buf' class='fnname'>fill_buf</a>(&mut self) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.slice.html">&[</a><a class="primitive" href="../primitive.u8.html">u8</a><a class="primitive" href="../primitive.slice.html">]</a>></code></span></h4>
<div class='docblock'><p>Fills the internal buffer of this object, returning the buffer contents. <a href="../../std/io/trait.BufRead.html#tymethod.fill_buf">Read more</a></p>
</div><h4 id='method.consume' class="method"><span id='consume.v' class='invisible'><code>fn <a href='../../std/io/trait.BufRead.html#tymethod.consume' class='fnname'>consume</a>(&mut self, amt: <a class="primitive" href="../primitive.usize.html">usize</a>)</code></span></h4>
<div class='docblock'><p>Tells this buffer that <code>amt</code> bytes have been consumed from the buffer, so they should no longer be returned in calls to <code>read</code>. <a href="../../std/io/trait.BufRead.html#tymethod.consume">Read more</a></p>
</div><h4 id='method.read_until' class="method"><span id='read_until.v' class='invisible'><code>fn <a href='../../std/io/trait.BufRead.html#method.read_until' class='fnname'>read_until</a>(&mut self, byte: <a class="primitive" href="../primitive.u8.html">u8</a>, buf: &mut <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><<a class="primitive" href="../primitive.u8.html">u8</a>>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.usize.html">usize</a>></code></span></h4>
<div class='docblock'><p>Read all bytes into <code>buf</code> until the delimiter <code>byte</code> or EOF is reached. <a href="../../std/io/trait.BufRead.html#method.read_until">Read more</a></p>
</div><h4 id='method.read_line' class="method"><span id='read_line.v' class='invisible'><code>fn <a href='../../std/io/trait.BufRead.html#method.read_line' class='fnname'>read_line</a>(&mut self, buf: &mut <a class="struct" href="../../std/string/struct.String.html" title="struct std::string::String">String</a>) -> <a class="type" href="../../std/io/type.Result.html" title="type std::io::Result">Result</a><<a class="primitive" href="../primitive.usize.html">usize</a>></code></span></h4>
<div class='docblock'><p>Read all bytes until a newline (the 0xA byte) is reached, and append them to the provided buffer. <a href="../../std/io/trait.BufRead.html#method.read_line">Read more</a></p>
</div><h4 id='method.split' class="method"><span id='split.v' class='invisible'><code>fn <a href='../../std/io/trait.BufRead.html#method.split' class='fnname'>split</a>(self, byte: <a class="primitive" href="../primitive.u8.html">u8</a>) -> <a class="struct" href="../../std/io/struct.Split.html" title="struct std::io::Split">Split</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></h4>
<div class='docblock'><p>Returns an iterator over the contents of this reader split on the byte <code>byte</code>. <a href="../../std/io/trait.BufRead.html#method.split">Read more</a></p>
</div><h4 id='method.lines' class="method"><span id='lines.v' class='invisible'><code>fn <a href='../../std/io/trait.BufRead.html#method.lines' class='fnname'>lines</a>(self) -> <a class="struct" href="../../std/io/struct.Lines.html" title="struct std::io::Lines">Lines</a><Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></span></h4>
<div class='docblock'><p>Returns an iterator over the lines of this reader. <a href="../../std/io/trait.BufRead.html#method.lines">Read more</a></p>
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