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<h1 class="menu-title">rules_rust</h1>
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<p>Module extensions for using rules_rust with bzlmod</p>
<h2 id="module-extensions"><a class="header" href="#module-extensions">Module Extensions</a></h2>
<ul>
<li><a href="#rust">rust</a></li>
<li><a href="#rust_host_tools">rust_host_tools</a></li>
</ul>
<p><a id="rust"></a></p>
<h2 id="rust"><a class="header" href="#rust">rust</a></h2>
<pre>
rust = use_extension("@rules_rust//rust:extensions.bzl", "rust")
rust.repository_set(<a href="#rust.repository_set-name">name</a>, <a href="#rust.repository_set-allocator_library">allocator_library</a>, <a href="#rust.repository_set-dev_components">dev_components</a>, <a href="#rust.repository_set-edition">edition</a>, <a href="#rust.repository_set-exec_triple">exec_triple</a>, <a href="#rust.repository_set-rustfmt_version">rustfmt_version</a>,
<a href="#rust.repository_set-sha256s">sha256s</a>, <a href="#rust.repository_set-target_compatible_with">target_compatible_with</a>, <a href="#rust.repository_set-target_settings">target_settings</a>, <a href="#rust.repository_set-target_triple">target_triple</a>, <a href="#rust.repository_set-urls">urls</a>, <a href="#rust.repository_set-versions">versions</a>)
rust.toolchain(<a href="#rust.toolchain-aliases">aliases</a>, <a href="#rust.toolchain-allocator_library">allocator_library</a>, <a href="#rust.toolchain-dev_components">dev_components</a>, <a href="#rust.toolchain-edition">edition</a>, <a href="#rust.toolchain-extra_exec_rustc_flags">extra_exec_rustc_flags</a>,
<a href="#rust.toolchain-extra_rustc_flags">extra_rustc_flags</a>, <a href="#rust.toolchain-extra_rustc_flags_triples">extra_rustc_flags_triples</a>, <a href="#rust.toolchain-extra_target_triples">extra_target_triples</a>,
<a href="#rust.toolchain-rust_analyzer_version">rust_analyzer_version</a>, <a href="#rust.toolchain-rustfmt_version">rustfmt_version</a>, <a href="#rust.toolchain-sha256s">sha256s</a>, <a href="#rust.toolchain-target_settings">target_settings</a>, <a href="#rust.toolchain-urls">urls</a>, <a href="#rust.toolchain-versions">versions</a>)
</pre>
<p>Rust toolchain extension.</p>
<p><strong>TAG CLASSES</strong></p>
<p><a id="rust.repository_set"></a></p>
<h3 id="repository_set"><a class="header" href="#repository_set">repository_set</a></h3>
<p>Tags for defining rust repository sets (where toolchains are defined).</p>
<p><strong>Attributes</strong></p>
<div class="table-wrapper"><table><thead><tr><th style="text-align: left">Name</th><th style="text-align: left">Description</th><th style="text-align: left">Type</th><th style="text-align: left">Mandatory</th><th style="text-align: left">Default</th></tr></thead><tbody>
<tr><td style="text-align: left"><a id="rust.repository_set-name"></a>name</td><td style="text-align: left">Name of the repository_set - if you're looking to replace default toolchains you must use the exact name you're replacing.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels#target-names">Name</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>""</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-allocator_library"></a>allocator_library</td><td style="text-align: left">Target that provides allocator functions when rust_library targets are embedded in a cc_binary.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>"@rules_rust//ffi/cc/allocator_library"</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-dev_components"></a>dev_components</td><td style="text-align: left">Whether to download the rustc-dev components (defaults to False). Requires version to be "nightly".</td><td style="text-align: left">Boolean</td><td style="text-align: left">optional</td><td style="text-align: left"><code>False</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-edition"></a>edition</td><td style="text-align: left">The rust edition to be used by default (2015, 2018, or 2021). If absent, every rule is required to specify its <code>edition</code> attribute.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>""</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-exec_triple"></a>exec_triple</td><td style="text-align: left">Exec triple for this repository_set.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>""</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-rustfmt_version"></a>rustfmt_version</td><td style="text-align: left">The version of the tool among "nightly", "beta", or an exact version.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>"nightly/2025-04-03"</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-sha256s"></a>sha256s</td><td style="text-align: left">A dict associating tool subdirectories to sha256 hashes. See <a href="#rust_repositories">rust_repositories</a> for more details.</td><td style="text-align: left"><a href="https://bazel.build/rules/lib/dict">Dictionary: String -&gt; String</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>{}</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-target_compatible_with"></a>target_compatible_with</td><td style="text-align: left">List of platform constraints this toolchain produces, for the particular target_triple this call is for.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels">List of labels</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>[]</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-target_settings"></a>target_settings</td><td style="text-align: left">A list of <code>config_settings</code> that must be satisfied by the target configuration in order for this toolchain to be selected during toolchain resolution.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels">List of labels</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>[]</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-target_triple"></a>target_triple</td><td style="text-align: left">target_triple to configure.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>""</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-urls"></a>urls</td><td style="text-align: left">A list of mirror urls containing the tools from the Rust-lang static file server. These must contain the '{}' used to substitute the tool being fetched (using .format).</td><td style="text-align: left">List of strings</td><td style="text-align: left">optional</td><td style="text-align: left"><code>["https://static.rust-lang.org/dist/{}.tar.xz"]</code></td></tr>
<tr><td style="text-align: left"><a id="rust.repository_set-versions"></a>versions</td><td style="text-align: left">A list of toolchain versions to download. This parameter only accepts one version per channel. E.g. <code>["1.65.0", "nightly/2022-11-02", "beta/2020-12-30"]</code>. May be set to an empty list (<code>[]</code>) to inhibit <code>rules_rust</code> from registering toolchains.</td><td style="text-align: left">List of strings</td><td style="text-align: left">optional</td><td style="text-align: left"><code>[]</code></td></tr>
</tbody></table>
</div>
<p><a id="rust.toolchain"></a></p>
<h3 id="toolchain"><a class="header" href="#toolchain">toolchain</a></h3>
<p>Tags for defining rust toolchains (where toolchain tools are fetched).</p>
<p><strong>Attributes</strong></p>
<div class="table-wrapper"><table><thead><tr><th style="text-align: left">Name</th><th style="text-align: left">Description</th><th style="text-align: left">Type</th><th style="text-align: left">Mandatory</th><th style="text-align: left">Default</th></tr></thead><tbody>
<tr><td style="text-align: left"><a id="rust.toolchain-aliases"></a>aliases</td><td style="text-align: left">Map of full toolchain repository name to an alias. If any repository is created by this extension matches a key in this dictionary, the name of the created repository will be remapped to the value instead. This may be required to work around path length limits on Windows.</td><td style="text-align: left"><a href="https://bazel.build/rules/lib/dict">Dictionary: String -&gt; String</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>{}</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-allocator_library"></a>allocator_library</td><td style="text-align: left">Target that provides allocator functions when rust_library targets are embedded in a cc_binary.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>"@rules_rust//ffi/cc/allocator_library"</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-dev_components"></a>dev_components</td><td style="text-align: left">Whether to download the rustc-dev components (defaults to False). Requires version to be "nightly".</td><td style="text-align: left">Boolean</td><td style="text-align: left">optional</td><td style="text-align: left"><code>False</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-edition"></a>edition</td><td style="text-align: left">The rust edition to be used by default (2015, 2018, or 2021). If absent, every rule is required to specify its <code>edition</code> attribute.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>""</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-extra_exec_rustc_flags"></a>extra_exec_rustc_flags</td><td style="text-align: left">Extra flags to pass to rustc in exec configuration</td><td style="text-align: left">List of strings</td><td style="text-align: left">optional</td><td style="text-align: left"><code>[]</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-extra_rustc_flags"></a>extra_rustc_flags</td><td style="text-align: left">Extra flags to pass to rustc in non-exec configuration</td><td style="text-align: left">List of strings</td><td style="text-align: left">optional</td><td style="text-align: left"><code>[]</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-extra_rustc_flags_triples"></a>extra_rustc_flags_triples</td><td style="text-align: left">Extra flags to pass to rustc in non-exec configuration. Key is the triple, value is the flag.</td><td style="text-align: left"><a href="https://bazel.build/rules/lib/dict">Dictionary: String -&gt; List of strings</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>{}</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-extra_target_triples"></a>extra_target_triples</td><td style="text-align: left">-</td><td style="text-align: left">List of strings</td><td style="text-align: left">optional</td><td style="text-align: left"><code>["wasm32-unknown-unknown", "wasm32-wasip1", "wasm32-wasip2"]</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-rust_analyzer_version"></a>rust_analyzer_version</td><td style="text-align: left">The version of Rustc to pair with rust-analyzer.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>""</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-rustfmt_version"></a>rustfmt_version</td><td style="text-align: left">The version of the tool among "nightly", "beta", or an exact version.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>"nightly/2025-04-03"</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-sha256s"></a>sha256s</td><td style="text-align: left">A dict associating tool subdirectories to sha256 hashes. See <a href="#rust_repositories">rust_repositories</a> for more details.</td><td style="text-align: left"><a href="https://bazel.build/rules/lib/dict">Dictionary: String -&gt; String</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>{}</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-target_settings"></a>target_settings</td><td style="text-align: left">A list of <code>config_settings</code> that must be satisfied by the target configuration in order for this toolchain to be selected during toolchain resolution.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels">List of labels</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>[]</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-urls"></a>urls</td><td style="text-align: left">A list of mirror urls containing the tools from the Rust-lang static file server. These must contain the '{}' used to substitute the tool being fetched (using .format).</td><td style="text-align: left">List of strings</td><td style="text-align: left">optional</td><td style="text-align: left"><code>["https://static.rust-lang.org/dist/{}.tar.xz"]</code></td></tr>
<tr><td style="text-align: left"><a id="rust.toolchain-versions"></a>versions</td><td style="text-align: left">A list of toolchain versions to download. This parameter only accepts one version per channel. E.g. <code>["1.65.0", "nightly/2022-11-02", "beta/2020-12-30"]</code>. May be set to an empty list (<code>[]</code>) to inhibit <code>rules_rust</code> from registering toolchains.</td><td style="text-align: left">List of strings</td><td style="text-align: left">optional</td><td style="text-align: left"><code>["1.86.0", "nightly/2025-04-03"]</code></td></tr>
</tbody></table>
</div>
<p><a id="rust_host_tools"></a></p>
<h2 id="rust_host_tools"><a class="header" href="#rust_host_tools">rust_host_tools</a></h2>
<pre>
rust_host_tools = use_extension("@rules_rust//rust:extensions.bzl", "rust_host_tools")
rust_host_tools.host_tools(<a href="#rust_host_tools.host_tools-name">name</a>, <a href="#rust_host_tools.host_tools-allocator_library">allocator_library</a>, <a href="#rust_host_tools.host_tools-dev_components">dev_components</a>, <a href="#rust_host_tools.host_tools-edition">edition</a>, <a href="#rust_host_tools.host_tools-rustfmt_version">rustfmt_version</a>,
<a href="#rust_host_tools.host_tools-sha256s">sha256s</a>, <a href="#rust_host_tools.host_tools-urls">urls</a>, <a href="#rust_host_tools.host_tools-version">version</a>)
</pre>
<p>An extension which exposes Rust tools compatible with the current host platform.</p>
<p><strong>TAG CLASSES</strong></p>
<p><a id="rust_host_tools.host_tools"></a></p>
<h3 id="host_tools"><a class="header" href="#host_tools">host_tools</a></h3>
<p><strong>Attributes</strong></p>
<div class="table-wrapper"><table><thead><tr><th style="text-align: left">Name</th><th style="text-align: left">Description</th><th style="text-align: left">Type</th><th style="text-align: left">Mandatory</th><th style="text-align: left">Default</th></tr></thead><tbody>
<tr><td style="text-align: left"><a id="rust_host_tools.host_tools-name"></a>name</td><td style="text-align: left">The name of the module to create</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels#target-names">Name</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>"rust_host_tools"</code></td></tr>
<tr><td style="text-align: left"><a id="rust_host_tools.host_tools-allocator_library"></a>allocator_library</td><td style="text-align: left">Target that provides allocator functions when rust_library targets are embedded in a cc_binary.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>"@rules_rust//ffi/cc/allocator_library"</code></td></tr>
<tr><td style="text-align: left"><a id="rust_host_tools.host_tools-dev_components"></a>dev_components</td><td style="text-align: left">Whether to download the rustc-dev components (defaults to False). Requires version to be "nightly".</td><td style="text-align: left">Boolean</td><td style="text-align: left">optional</td><td style="text-align: left"><code>False</code></td></tr>
<tr><td style="text-align: left"><a id="rust_host_tools.host_tools-edition"></a>edition</td><td style="text-align: left">The rust edition to be used by default (2015, 2018, or 2021). If absent, every rule is required to specify its <code>edition</code> attribute.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>""</code></td></tr>
<tr><td style="text-align: left"><a id="rust_host_tools.host_tools-rustfmt_version"></a>rustfmt_version</td><td style="text-align: left">The version of the tool among "nightly", "beta", or an exact version.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>"nightly/2025-04-03"</code></td></tr>
<tr><td style="text-align: left"><a id="rust_host_tools.host_tools-sha256s"></a>sha256s</td><td style="text-align: left">A dict associating tool subdirectories to sha256 hashes. See <a href="#rust_repositories">rust_repositories</a> for more details.</td><td style="text-align: left"><a href="https://bazel.build/rules/lib/dict">Dictionary: String -&gt; String</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>{}</code></td></tr>
<tr><td style="text-align: left"><a id="rust_host_tools.host_tools-urls"></a>urls</td><td style="text-align: left">A list of mirror urls containing the tools from the Rust-lang static file server. These must contain the '{}' used to substitute the tool being fetched (using .format).</td><td style="text-align: left">List of strings</td><td style="text-align: left">optional</td><td style="text-align: left"><code>["https://static.rust-lang.org/dist/{}.tar.xz"]</code></td></tr>
<tr><td style="text-align: left"><a id="rust_host_tools.host_tools-version"></a>version</td><td style="text-align: left">The version of Rust to use for tools executed on the Bazel host.</td><td style="text-align: left">String</td><td style="text-align: left">optional</td><td style="text-align: left"><code>"1.86.0"</code></td></tr>
</tbody></table>
</div>
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