396 lines
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396 lines
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<main>
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<h1 id="rustdoc-overview"><a class="header" href="#rustdoc-overview">Rustdoc overview</a></h1>
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<p><code>rustdoc</code> lives in-tree with the
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compiler and standard library. This chapter is about how it works.
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For information about Rustdoc's features and how to use them, see
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the <a href="https://doc.rust-lang.org/nightly/rustdoc/">Rustdoc book</a>.
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For more details about how rustdoc works, see the
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<a href="./rustdoc-internals.html">"Rustdoc internals" chapter</a>.</p>
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<ul>
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<li><a href="#cheat-sheet">Cheat sheet</a></li>
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<li><a href="#code-structure">Code structure</a></li>
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<li><a href="#tests">Tests</a></li>
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<li><a href="#constraints">Constraints</a></li>
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<li><a href="#multiple-runs-same-output-directory">Multiple runs, same output directory</a></li>
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<li><a href="#use-cases">Use cases</a>
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<ul>
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<li><a href="#standard-library-docs">Standard library docs</a></li>
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<li><a href="#docsrs">docs.rs</a></li>
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<li><a href="#locally-generated-docs">Locally generated docs</a></li>
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<li><a href="#self-hosted-project-docs">Self-hosted project docs</a></li>
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</ul>
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</li>
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</ul>
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<p><code>rustdoc</code> uses <code>rustc</code> internals (and, of course, the standard library), so you
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will have to build the compiler and <code>std</code> once before you can build <code>rustdoc</code>.</p>
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<p>Rustdoc is implemented entirely within the crate <a href="https://github.com/rust-lang/rust/tree/master/src/librustdoc"><code>librustdoc</code></a>. It runs
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the compiler up to the point where we have an internal representation of a
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crate (HIR) and the ability to run some queries about the types of items. <a href="./hir.html">HIR</a>
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and <a href="./query.html">queries</a> are discussed in the linked chapters.</p>
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<p><code>librustdoc</code> performs two major steps after that to render a set of
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documentation:</p>
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<ul>
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<li>"Clean" the AST into a form that's more suited to creating documentation (and
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slightly more resistant to churn in the compiler).</li>
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<li>Use this cleaned AST to render a crate's documentation, one page at a time.</li>
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</ul>
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<p>Naturally, there's more than just this, and those descriptions simplify out
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lots of details, but that's the high-level overview.</p>
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<p>(Side note: <code>librustdoc</code> is a library crate! The <code>rustdoc</code> binary is created
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using the project in <a href="https://github.com/rust-lang/rust/tree/master/src/tools/rustdoc"><code>src/tools/rustdoc</code></a>. Note that literally all that
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does is call the <code>main()</code> that's in this crate's <code>lib.rs</code>, though.)</p>
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<h2 id="cheat-sheet"><a class="header" href="#cheat-sheet">Cheat sheet</a></h2>
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<ul>
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<li>Run <code>./x setup tools</code> before getting started. This will configure <code>x</code>
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with nice settings for developing rustdoc and other tools, including
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downloading a copy of rustc rather than building it.</li>
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<li>Use <code>./x check rustdoc</code> to quickly check for compile errors.</li>
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<li>Use <code>./x build library rustdoc</code> to make a usable
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rustdoc you can run on other projects.
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<ul>
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<li>Add <code>library/test</code> to be able to use <code>rustdoc --test</code>.</li>
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<li>Run <code>rustup toolchain link stage2 build/host/stage2</code> to add a
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custom toolchain called <code>stage2</code> to your rustup environment. After
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running that, <code>cargo +stage2 doc</code> in any directory will build with
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your locally-compiled rustdoc.</li>
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</ul>
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</li>
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<li>Use <code>./x doc library</code> to use this rustdoc to generate the
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standard library docs.
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<ul>
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<li>The completed docs will be available in <code>build/host/doc</code> (under <code>core</code>, <code>alloc</code>, and <code>std</code>).</li>
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<li>If you want to copy those docs to a webserver, copy all of
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<code>build/host/doc</code>, since that's where the CSS, JS, fonts, and landing
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page are.</li>
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<li>For frontend debugging, disable the <code>rust.docs-minification</code> option in <a href="./building/how-to-build-and-run.html"><code>bootstrap.toml</code></a>.</li>
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</ul>
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</li>
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<li>Use <code>./x test tests/rustdoc*</code> to run the tests using a stage1
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rustdoc.
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<ul>
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<li>See <a href="./rustdoc-internals.html">Rustdoc internals</a> for more information about tests.</li>
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</ul>
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</li>
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</ul>
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<h2 id="code-structure"><a class="header" href="#code-structure">Code structure</a></h2>
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<p>All paths in this section are relative to <code>src/librustdoc/</code> in the rust-lang/rust repository.</p>
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<ul>
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<li>Most of the HTML printing code is in <code>html/format.rs</code> and <code>html/render/mod.rs</code>.
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It's in a bunch of functions returning <code>impl std::fmt::Display</code>.</li>
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<li>The data types that get rendered by the functions mentioned above are defined in <code>clean/types.rs</code>.
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The functions responsible for creating them from the <code>HIR</code> and the <code>rustc_middle::ty</code> IR
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live in <code>clean/mod.rs</code>.</li>
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<li>The bits specific to using rustdoc as a test harness are in
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<code>doctest.rs</code>.</li>
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<li>The Markdown renderer is loaded up in <code>html/markdown.rs</code>, including functions
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for extracting doctests from a given block of Markdown.</li>
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<li>Frontend CSS and JavaScript are stored in <code>html/static/</code>.
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<ul>
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<li>Re. JavaScript, type annotations are written using <a href="https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html">TypeScript-flavored JSDoc</a>
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comments and an external <code>.d.ts</code> file.
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This way, the code itself remains plain, valid JavaScript.
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We only use <code>tsc</code> as a linter.</li>
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</ul>
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</li>
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</ul>
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<h2 id="tests"><a class="header" href="#tests">Tests</a></h2>
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<p><code>rustdoc</code>'s integration tests are split across several test suites.
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See <a href="tests/compiletest.html#rustdoc-test-suites">Rustdoc tests suites</a> for more details.</p>
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<h2 id="constraints"><a class="header" href="#constraints">Constraints</a></h2>
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<p>We try to make rustdoc work reasonably well with JavaScript disabled, and when
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browsing local files. We support
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<a href="https://rust-lang.github.io/rfcs/1985-tiered-browser-support.html#supported-browsers">these browsers</a>.</p>
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<p>Supporting local files (<code>file:///</code> URLs) brings some surprising restrictions.
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Certain browser features that require secure origins, like <code>localStorage</code> and
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Service Workers, don't work reliably. We can still use such features but we
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should make sure pages are still usable without them.</p>
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<p>Rustdoc <a href="https://doc.rust-lang.org/rustdoc/advanced-features.html#interactions-between-platform-specific-docs">does not type-check function bodies</a>.
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This works by <a href="https://github.com/rust-lang/rust/blob/52bf0cf795dfecc8b929ebb1c1e2545c3f41d4c9/src/librustdoc/core.rs#L299-L323">overriding the built-in queries for typeck</a>,
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by <a href="https://github.com/rust-lang/rust/blob/52bf0cf795dfecc8b929ebb1c1e2545c3f41d4c9/compiler/rustc_resolve/src/late.rs#L4517">silencing name resolution errors</a>, and by <a href="https://github.com/rust-lang/rust/blob/52bf0cf795dfecc8b929ebb1c1e2545c3f41d4c9/compiler/rustc_hir_analysis/src/check/check.rs#L188-L194">not resolving opaque types</a>.
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This comes with several caveats: in particular, rustdoc <em>cannot</em> run any parts of the compiler that
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require type-checking bodies; for example it cannot generate <code>.rlib</code> files or run most lints.
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We want to move away from this model eventually, but we need some alternative for
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<a href="https://github.com/rust-lang/rust/issues/75100">the people using it</a>; see <a href="https://rust-lang.zulipchat.com/#narrow/stream/266220-rustdoc/topic/stop.20accepting.20broken.20code">various</a>
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<a href="https://rust-lang.zulipchat.com/#narrow/channel/393423-t-rustdoc.2Fmeetings/topic/meeting.202024-07-08/near/449969836">previous</a> <a href="https://rust-lang.zulipchat.com/#narrow/channel/238009-t-compiler.2Fmeetings/topic/.5Bweekly.5D.202023-01-26/near/323755789">zulip</a> <a href="https://rust-lang.zulipchat.com/#narrow/channel/266220-t-rustdoc/topic/Pre-RFC.3A.20stop.20accepting.20broken.20code">discussion</a>.
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For examples of code that breaks if this hack is removed, see
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<a href="https://github.com/rust-lang/rust/tree/163cb4ea3f0ae3bc7921cc259a08a7bf92e73ee6/tests/rustdoc-ui/error-in-impl-trait"><code>tests/rustdoc-ui/error-in-impl-trait</code></a>.</p>
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<h2 id="multiple-runs-same-output-directory"><a class="header" href="#multiple-runs-same-output-directory">Multiple runs, same output directory</a></h2>
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<p>Rustdoc can be run multiple times for varying inputs, with its output set to the
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same directory. That's how cargo produces documentation for dependencies of the
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current crate. It can also be done manually if a user wants a big
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documentation bundle with all of the docs they care about.</p>
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<p>HTML is generated independently for each crate, but there is some cross-crate
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information that we update as we add crates to the output directory:</p>
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<ul>
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<li><code>crates<SUFFIX>.js</code> holds a list of all crates in the output directory.</li>
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<li><code>search-index<SUFFIX>.js</code> holds a list of all searchable items.</li>
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<li>For each trait, there is a file under <code>implementors/.../trait.TraitName.js</code>
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containing a list of implementors of that trait. The implementors may be in
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different crates than the trait, and the JS file is updated as we discover
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new ones.</li>
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</ul>
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<h2 id="use-cases"><a class="header" href="#use-cases">Use cases</a></h2>
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<p>There are a few major use cases for rustdoc that you should keep in mind when
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working on it:</p>
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<h3 id="standard-library-docs"><a class="header" href="#standard-library-docs">Standard library docs</a></h3>
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<p>These are published at <a href="https://doc.rust-lang.org/std">https://doc.rust-lang.org/std</a> as part of the Rust release
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process. Stable releases are also uploaded to specific versioned URLs like
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<a href="https://doc.rust-lang.org/1.57.0/std/">https://doc.rust-lang.org/1.57.0/std/</a>. Beta and nightly docs are published to
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<a href="https://doc.rust-lang.org/beta/std/">https://doc.rust-lang.org/beta/std/</a> and <a href="https://doc.rust-lang.org/nightly/std/">https://doc.rust-lang.org/nightly/std/</a>.
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The docs are uploaded with the <a href="https://github.com/rust-lang/promote-release">promote-release
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tool</a> and served from S3 with
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CloudFront.</p>
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<p>The standard library docs contain five crates: alloc, core, proc_macro, std, and
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test.</p>
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<h3 id="docsrs"><a class="header" href="#docsrs">docs.rs</a></h3>
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<p>When crates are published to crates.io, docs.rs automatically builds
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and publishes their documentation, for instance at
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<a href="https://docs.rs/serde/latest/serde/">https://docs.rs/serde/latest/serde/</a>. It always builds with the current nightly
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rustdoc, so any changes you land in rustdoc are "insta-stable" in that they will
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have an immediate public effect on docs.rs. Old documentation is not rebuilt, so
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you will see some variation in UI when browsing old releases in docs.rs. Crate
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authors can request rebuilds, which will be run with the latest rustdoc.</p>
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<p>Docs.rs performs some transformations on rustdoc's output in order to save
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storage and display a navigation bar at the top. In particular, certain static
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files, like main.js and rustdoc.css, may be shared across multiple invocations
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of the same version of rustdoc. Others, like crates.js and sidebar-items.js, are
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different for different invocations. Still others, like fonts, will never
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change. These categories are distinguished using the <code>SharedResource</code> enum in
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<code>src/librustdoc/html/render/write_shared.rs</code></p>
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<p>Documentation on docs.rs is always generated for a single crate at a time, so
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the search and sidebar functionality don't include dependencies of the current
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crate.</p>
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<h3 id="locally-generated-docs"><a class="header" href="#locally-generated-docs">Locally generated docs</a></h3>
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<p>Crate authors can run <code>cargo doc --open</code> in crates they have checked
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out locally to see the docs. This is useful to check that the docs they
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are writing are useful and display correctly. It can also be useful for
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people to view documentation on crates they aren't authors of, but want to
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use. In both cases, people may use <code>--document-private-items</code> Cargo flag to
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see private methods, fields, and so on, which are normally not displayed.</p>
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<p>By default <code>cargo doc</code> will generate documentation for a crate and all of its
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dependencies. That can result in a very large documentation bundle, with a large
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(and slow) search corpus. The Cargo flag <code>--no-deps</code> inhibits that behavior and
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<h3 id="self-hosted-project-docs"><a class="header" href="#self-hosted-project-docs">Self-hosted project docs</a></h3>
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<a href="https://docs.serde.rs/">https://docs.serde.rs/</a>. This is easy to do by locally generating docs, and
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