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# Introduction

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% The Rust Compiler Plugins Guide

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<div class="unstable-feature">

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<p> <b>Warning:</b> Plugins are an advanced, unstable feature! For many details, the only available documentation is the <a href="syntax/index.html"><code>libsyntax</code></a> and <a href="rustc/index.html"><code>librustc</code></a> API docs, or even the source code itself. These internal compiler APIs are also subject to change at any time. </p>

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<p> For defining new syntax it is often much easier to use Rust's <a href="guide-macros.html">built-in macro system</a>. </p>

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<p style="margin-bottom: 0"> The code in this document uses language features not covered in the Rust Guide. See the <a href="reference.html">Reference Manual</a> for more information. </p>

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</div>

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`rustc` can load compiler plugins, which are user-provided libraries that extend the compiler's behavior with new syntax extensions, lint checks, etc.

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A plugin is a dynamic library crate with a designated "registrar" function that registers extensions with `rustc`. Other crates can use these extensions by loading the plugin crate with `#[phase(plugin)] extern crate`. See the [`rustc::plugin`](rustc/plugin/index.html) documentation for more about the mechanics of defining and loading a plugin.

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# Syntax extensions