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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="API documentation for the Rust `Group` struct in crate `proc_macro`."><meta name="keywords" content="rust, rustlang, rust-lang, Group"><title>proc_macro::Group - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../proc_macro/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a><p class='location'>Struct Group</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.delimiter">delimiter</a><a href="#method.stream">stream</a><a href="#method.span">span</a><a href="#method.set_span">set_span</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-From%3CGroup%3E">From&lt;Group&gt;</a><a href="#impl-Clone">Clone</a><a href="#impl-Debug">Debug</a><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a><a href="#impl-Display">Display</a></div></div><p class='location'><a href='index.html'>proc_macro</a></p><script>window.sidebarCurrent = {name: 'Group', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>proc_macro</a>::<wbr><a class="struct" href=''>Group</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version '></span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>&#x2212;</span>]</a></span><a class='srclink' href='../src/proc_macro/lib.rs.html#597-601' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct Group { /* fields omitted */ }</pre></div><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API.  (<code>proc_macro </code><a href="https://github.com/rust-lang/rust/issues/38356">#38356</a>)</div></div><div class='docblock'><p>A delimited token stream.</p>
<p>A <code>Group</code> internally contains a <code>TokenStream</code> which is surrounded by <code>Delimiter</code>s.</p>
</div>
                    <h2 id='methods' class='small-section-header'>
                      Methods<a href='#methods' class='anchor'></a>
                    </h2>
                <h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../proc_macro/struct.Group.html" title="struct proc_macro::Group">Group</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#626-673' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.new' class='fnname'>new</a>(delimiter: <a class="enum" href="../proc_macro/enum.Delimiter.html" title="enum proc_macro::Delimiter">Delimiter</a>, stream: <a class="struct" href="../proc_macro/struct.TokenStream.html" title="struct proc_macro::TokenStream">TokenStream</a>) -&gt; <a class="struct" href="../proc_macro/struct.Group.html" title="struct proc_macro::Group">Group</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#633-639' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API.  (<code>proc_macro </code><a href="https://github.com/rust-lang/rust/issues/38356">#38356</a>)</div></div><div class='docblock'><p>Creates a new <code>Group</code> with the given delimiter and token stream.</p>
<p>This constructor will set the span for this group to
<code>Span::call_site()</code>. To change the span you can use the <code>set_span</code>
method below.</p>
</div><h4 id='method.delimiter' class="method"><span id='delimiter.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.delimiter' class='fnname'>delimiter</a>(&amp;self) -&gt; <a class="enum" href="../proc_macro/enum.Delimiter.html" title="enum proc_macro::Delimiter">Delimiter</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#643-645' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API.  (<code>proc_macro </code><a href="https://github.com/rust-lang/rust/issues/38356">#38356</a>)</div></div><div class='docblock'><p>Returns the delimiter of this <code>Group</code></p>
</div><h4 id='method.stream' class="method"><span id='stream.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.stream' class='fnname'>stream</a>(&amp;self) -&gt; <a class="struct" href="../proc_macro/struct.TokenStream.html" title="struct proc_macro::TokenStream">TokenStream</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#652-654' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API.  (<code>proc_macro </code><a href="https://github.com/rust-lang/rust/issues/38356">#38356</a>)</div></div><div class='docblock'><p>Returns the <code>TokenStream</code> of tokens that are delimited in this <code>Group</code>.</p>
<p>Note that the returned token stream does not include the delimiter
returned above.</p>
</div><h4 id='method.span' class="method"><span id='span.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.span' class='fnname'>span</a>(&amp;self) -&gt; <a class="struct" href="../proc_macro/struct.Span.html" title="struct proc_macro::Span">Span</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#659-661' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API.  (<code>proc_macro </code><a href="https://github.com/rust-lang/rust/issues/38356">#38356</a>)</div></div><div class='docblock'><p>Returns the span for the delimiters of this token stream, spanning the
entire <code>Group</code>.</p>
</div><h4 id='method.set_span' class="method"><span id='set_span.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.set_span' class='fnname'>set_span</a>(&amp;mut self, span: <a class="struct" href="../proc_macro/struct.Span.html" title="struct proc_macro::Span">Span</a>)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#670-672' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API.  (<code>proc_macro </code><a href="https://github.com/rust-lang/rust/issues/38356">#38356</a>)</div></div><div class='docblock'><p>Configures the span for this <code>Group</code>'s delimiters, but not its internal
tokens.</p>
<p>This method will <strong>not</strong> set the span of all the internal tokens spanned
by this group, but rather it will only set the span of the delimiter
tokens at the level of the <code>Group</code>.</p>
</div></div>
                <h2 id='implementations' class='small-section-header'>
                  Trait Implementations<a href='#implementations' class='anchor'></a>
                </h2>
                <div id='implementations-list'><h3 id='impl-From%3CGroup%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="../core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="../proc_macro/struct.Group.html" title="struct proc_macro::Group">Group</a>&gt; for <a class="enum" href="../proc_macro/enum.TokenTree.html" title="enum proc_macro::TokenTree">TokenTree</a></code><a href='#impl-From%3CGroup%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#550-554' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.from' class="method"><span id='from.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(g: <a class="struct" href="../proc_macro/struct.Group.html" title="struct proc_macro::Group">Group</a>) -&gt; <a class="enum" href="../proc_macro/enum.TokenTree.html" title="enum proc_macro::TokenTree">TokenTree</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#551-553' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs the conversion.</p>
</div></div><h3 id='impl-Clone' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../proc_macro/struct.Group.html" title="struct proc_macro::Group">Group</a></code><a href='#impl-Clone' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#595' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&amp;self) -&gt; <a class="struct" href="../proc_macro/struct.Group.html" title="struct proc_macro::Group">Group</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#595' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns a copy of the value. <a href="../core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&amp;mut self, source: <a class="primitive" href="../std/primitive.reference.html">&amp;</a>Self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='../src/core/clone.rs.html#130-132' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="../core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="../core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../proc_macro/struct.Group.html" title="struct proc_macro::Group">Group</a></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#595' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="../core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#595' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="../core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl !<a class="trait" href="../core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../proc_macro/struct.Group.html" title="struct proc_macro::Group">Group</a></code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#604' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl !<a class="trait" href="../core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../proc_macro/struct.Group.html" title="struct proc_macro::Group">Group</a></code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#606' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Display' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="../core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for <a class="struct" href="../proc_macro/struct.Group.html" title="struct proc_macro::Group">Group</a></code><a href='#impl-Display' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#679-683' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='docblock'><p>Prints the group as a string that should be losslessly convertible back
into the same group (modulo spans), except for possibly <code>TokenTree::Group</code>s
with <code>Delimiter::None</code> delimiters.</p>
</div><div class='impl-items'><h4 id='method.fmt-1' class="method"><span id='fmt.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../core/fmt/trait.Display.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="../core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro/lib.rs.html#680-682' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="../core/fmt/trait.Display.html#tymethod.fmt">Read more</a></p>
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