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  1. <!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 `TokenTree` enum in crate `proc_macro2`."><meta name="keywords" content="rust, rustlang, rust-lang, TokenTree"><title>proc_macro2::TokenTree - 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></head><body class="rustdoc enum"><!--[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><p class='location'>Enum TokenTree</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#variants">Variants</a><div class="sidebar-links"><a href="#variant.Group">Group</a><a href="#variant.Ident">Ident</a><a href="#variant.Punct">Punct</a><a href="#variant.Literal">Literal</a></div><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><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-Extend%3CTokenTree%3E">Extend&lt;TokenTree&gt;</a><a href="#impl-FromIterator%3CTokenTree%3E">FromIterator&lt;TokenTree&gt;</a><a href="#impl-Clone">Clone</a><a href="#impl-From%3CGroup%3E">From&lt;Group&gt;</a><a href="#impl-From%3CIdent%3E">From&lt;Ident&gt;</a><a href="#impl-From%3CPunct%3E">From&lt;Punct&gt;</a><a href="#impl-From%3CLiteral%3E">From&lt;Literal&gt;</a><a href="#impl-Display">Display</a><a href="#impl-Debug">Debug</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a></div></div><p class='location'><a href='index.html'>proc_macro2</a></p><script>window.sidebarCurrent = {name: 'TokenTree', ty: 'enum', 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'>Enum <a href='index.html'>proc_macro2</a>::<wbr><a class="enum" href=''>TokenTree</a></span><span class='out-of-band'><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_macro2/lib.rs.html#397-406' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust enum'>pub enum TokenTree {
    2. 

  2.     Group(<a class="struct" href="../proc_macro2/struct.Group.html" title="struct proc_macro2::Group">Group</a>),
    3. 

  3.     Ident(<a class="struct" href="../proc_macro2/struct.Ident.html" title="struct proc_macro2::Ident">Ident</a>),
    4. 

  4.     Punct(<a class="struct" href="../proc_macro2/struct.Punct.html" title="struct proc_macro2::Punct">Punct</a>),
    5. 

  5.     Literal(<a class="struct" href="../proc_macro2/struct.Literal.html" title="struct proc_macro2::Literal">Literal</a>),
    6. 

  6. }</pre></div><div class='docblock'><p>A single token or a delimited sequence of token trees (e.g. <code>[1, (), ..]</code>).</p>
    7. 

  7. </div><h2 id='variants' class='variants small-section-header'>
    8. 

  8.                    Variants<a href='#variants' class='anchor'></a></h2>
    9. 

  9. <span id="variant.Group" class="variant small-section-header"><a href="#variant.Group" class="anchor field"></a><span id='Group.v' class='invisible'><code>Group(<a class="struct" href="../proc_macro2/struct.Group.html" title="struct proc_macro2::Group">Group</a>)</code></span></span><div class='docblock'><p>A token stream surrounded by bracket delimiters.</p>
    10. 

  10. </div><span id="variant.Ident" class="variant small-section-header"><a href="#variant.Ident" class="anchor field"></a><span id='Ident.v' class='invisible'><code>Ident(<a class="struct" href="../proc_macro2/struct.Ident.html" title="struct proc_macro2::Ident">Ident</a>)</code></span></span><div class='docblock'><p>An identifier.</p>
    11. 

  11. </div><span id="variant.Punct" class="variant small-section-header"><a href="#variant.Punct" class="anchor field"></a><span id='Punct.v' class='invisible'><code>Punct(<a class="struct" href="../proc_macro2/struct.Punct.html" title="struct proc_macro2::Punct">Punct</a>)</code></span></span><div class='docblock'><p>A single punctuation character (<code>+</code>, <code>,</code>, <code>$</code>, etc.).</p>
    12. 

  12. </div><span id="variant.Literal" class="variant small-section-header"><a href="#variant.Literal" class="anchor field"></a><span id='Literal.v' class='invisible'><code>Literal(<a class="struct" href="../proc_macro2/struct.Literal.html" title="struct proc_macro2::Literal">Literal</a>)</code></span></span><div class='docblock'><p>A literal character (<code>'a'</code>), string (<code>&quot;hello&quot;</code>), number (<code>2.3</code>), etc.</p>
    13. 

  13. </div>
    14. 

  14.                     <h2 id='methods' class='small-section-header'>
    15. 

  15.                       Methods<a href='#methods' class='anchor'></a>
    16. 

  16.                     </h2>
    17. 

  17.                 <h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</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_macro2/lib.rs.html#408-433' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><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_macro2/struct.Span.html" title="struct proc_macro2::Span">Span</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#411-418' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns the span of this tree, delegating to the <code>span</code> method of
    18. 

  18. the contained token or a delimited stream.</p>
    19. 

  19. </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_macro2/struct.Span.html" title="struct proc_macro2::Span">Span</a>)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#425-432' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Configures the span for <em>only this token</em>.</p>
    20. 

  20. <p>Note that if this token is a <code>Group</code> then this method will not configure
    21. 

  21. the span of each of the internal tokens, this will simply delegate to
    22. 

  22. the <code>set_span</code> method of each variant.</p>
    23. 

  23. </div></div>
    24. 

  24.                 <h2 id='implementations' class='small-section-header'>
    25. 

  25.                   Trait Implementations<a href='#implementations' class='anchor'></a>
    26. 

  26.                 </h2>
    27. 

  27.                 <div id='implementations-list'><h3 id='impl-Extend%3CTokenTree%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.Extend.html" title="trait core::iter::traits::Extend">Extend</a>&lt;<a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a>&gt; for <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a></code><a href='#impl-Extend%3CTokenTree%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#166-170' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.extend' class="method"><span id='extend.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/iter/traits/trait.Extend.html#tymethod.extend' class='fnname'>extend</a>&lt;I:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a>&lt;Item = <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a>&gt;&gt;(&amp;mut self, streams: I)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#167-169' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Extends a collection with the contents of an iterator. <a href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.Extend.html#tymethod.extend">Read more</a></p>
    28. 

  28. </div></div><h3 id='impl-FromIterator%3CTokenTree%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.FromIterator.html" title="trait core::iter::traits::FromIterator">FromIterator</a>&lt;<a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a>&gt; for <a class="struct" href="../proc_macro2/struct.TokenStream.html" title="struct proc_macro2::TokenStream">TokenStream</a></code><a href='#impl-FromIterator%3CTokenTree%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#180-184' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='docblock'><p>Collects a number of token trees into a single stream.</p>
    29. 

  29. </div><div class='impl-items'><h4 id='method.from_iter' class="method"><span id='from_iter.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/iter/traits/trait.FromIterator.html#tymethod.from_iter' class='fnname'>from_iter</a>&lt;I:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a>&lt;Item = <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a>&gt;&gt;(streams: I) -&gt; Self</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#181-183' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates a value from an iterator. <a href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.FromIterator.html#tymethod.from_iter">Read more</a></p>
    30. 

  30. </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="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</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_macro2/lib.rs.html#396' 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='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&amp;self) -&gt; <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#396' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
    31. 

  31. </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='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&amp;mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/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='https://doc.rust-lang.org/nightly/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="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
    32. 

  32. </div></div><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="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="../proc_macro2/struct.Group.html" title="struct proc_macro2::Group">Group</a>&gt; for <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::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_macro2/lib.rs.html#435-439' 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='https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(g: <a class="struct" href="../proc_macro2/struct.Group.html" title="struct proc_macro2::Group">Group</a>) -&gt; <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#436-438' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs the conversion.</p>
    33. 

  33. </div></div><h3 id='impl-From%3CIdent%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="../proc_macro2/struct.Ident.html" title="struct proc_macro2::Ident">Ident</a>&gt; for <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></code><a href='#impl-From%3CIdent%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#441-445' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.from-1' class="method"><span id='from.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(g: <a class="struct" href="../proc_macro2/struct.Ident.html" title="struct proc_macro2::Ident">Ident</a>) -&gt; <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#442-444' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs the conversion.</p>
    34. 

  34. </div></div><h3 id='impl-From%3CPunct%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="../proc_macro2/struct.Punct.html" title="struct proc_macro2::Punct">Punct</a>&gt; for <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></code><a href='#impl-From%3CPunct%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#447-451' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.from-2' class="method"><span id='from.v-2' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(g: <a class="struct" href="../proc_macro2/struct.Punct.html" title="struct proc_macro2::Punct">Punct</a>) -&gt; <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#448-450' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs the conversion.</p>
    35. 

  35. </div></div><h3 id='impl-From%3CLiteral%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="../proc_macro2/struct.Literal.html" title="struct proc_macro2::Literal">Literal</a>&gt; for <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></code><a href='#impl-From%3CLiteral%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#453-457' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.from-3' class="method"><span id='from.v-3' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(g: <a class="struct" href="../proc_macro2/struct.Literal.html" title="struct proc_macro2::Literal">Literal</a>) -&gt; <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/proc_macro2/lib.rs.html#454-456' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs the conversion.</p>
    36. 

  36. </div></div><h3 id='impl-Display' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</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_macro2/lib.rs.html#463-472' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='docblock'><p>Prints the token tree as a string that is supposed to be losslessly
    37. 

  37. convertible back into the same token tree (modulo spans), except for
    38. 

  38. possibly <code>TokenTree::Group</code>s with <code>Delimiter::None</code> delimiters and negative
    39. 

  39. numeric literals.</p>
    40. 

  40. </div><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='https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/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_macro2/lib.rs.html#464-471' 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="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt">Read more</a></p>
    41. 

  41. </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="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</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_macro2/lib.rs.html#475-492' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='docblock'><p>Prints token tree in a form convenient for debugging.</p>
    42. 

  42. </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='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/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_macro2/lib.rs.html#476-491' 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="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
    43. 

  43. </div></div></div>
    44. 

  44.                 <h2 id='synthetic-implementations' class='small-section-header'>
    45. 

  45.                   Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a>
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  47.                 <div id='synthetic-implementations-list'>
    48. 

  48.             <h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'></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="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="enum" href="../proc_macro2/enum.TokenTree.html" title="enum proc_macro2::TokenTree">TokenTree</a></code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div></div></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>&#9166;</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../";window.currentCrate = "proc_macro2";</script><script src="../aliases.js"></script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>
    49.