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<p class='location'>Crate proc_macro2</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'proc_macro2', ty: 'mod', relpath: '../'};</script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>proc_macro2</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/proc_macro2/lib.rs.html#1-590' title='goto source code'>[src]</a></span></h1><div class='docblock'><p>A "shim crate" intended to multiplex the <a href="https://doc.rust-lang.org/proc_macro/"><code>proc_macro</code></a> API on to stable
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Rust.</p>
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<p>Procedural macros in Rust operate over the upstream
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<a href="https://doc.rust-lang.org/proc_macro/struct.TokenStream.html"><code>proc_macro::TokenStream</code></a> type. This type currently is quite
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conservative and exposed no internal implementation details. Nightly
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compilers, however, contain a much richer interface. This richer interface
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allows fine-grained inspection of the token stream which avoids
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stringification/re-lexing and also preserves span information.</p>
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<p>The upcoming APIs added to <a href="https://doc.rust-lang.org/proc_macro/"><code>proc_macro</code></a> upstream are the foundation for
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productive procedural macros in the ecosystem. To help prepare the ecosystem
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for using them this crate serves to both compile on stable and nightly and
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mirrors the API-to-be. The intention is that procedural macros which switch
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to use this crate will be trivially able to switch to the upstream
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<code>proc_macro</code> crate once its API stabilizes.</p>
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<p>In the meantime this crate also has a <code>nightly</code> Cargo feature which
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enables it to reimplement itself with the unstable API of <a href="https://doc.rust-lang.org/proc_macro/"><code>proc_macro</code></a>.
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This'll allow immediate usage of the beneficial upstream API, particularly
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around preserving span information.</p>
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<td><a class="mod" href="token_stream/index.html"
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title='mod proc_macro2::token_stream'>token_stream</a></td>
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title='struct proc_macro2::Group'>Group</a></td>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Literal.html"
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title='struct proc_macro2::Literal'>Literal</a></td>
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<td class='docblock-short'>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Op.html"
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title='struct proc_macro2::Op'>Op</a></td>
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</td>
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title='struct proc_macro2::TokenStream'>TokenStream</a></td>
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title='enum proc_macro2::Delimiter'>Delimiter</a></td>
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title='enum proc_macro2::Spacing'>Spacing</a></td>
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