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| <main> |
| <h1 id="getting-started"><a class="header" href="#getting-started">Getting Started</a></h1> |
| <p>Thank you for your interest in contributing to Rust! |
| There are many ways to contribute, and we appreciate all of them.</p> |
| <p>For general information about how to contribute to Rust, |
| see <a href="https://forge.rust-lang.org/how-to-start-contributing.html">Forge</a>. |
| The rest of this section is about how to contribute to the compiler specifically.</p> |
| <p>This documentation is <em>not</em> intended to be comprehensive; |
| it is meant to be a quick guide for the most useful things. |
| For more information, |
| see <a href="building/how-to-build-and-run.html">How to build and run the compiler</a>.</p> |
| <h2 id="finding-help"><a class="header" href="#finding-help">Finding help</a></h2> |
| <p>See also <a href="https://forge.rust-lang.org/how-to-start-contributing.html#asking-questions">“Asking |
| Questions”</a>.</p> |
| <h3 id="experts"><a class="header" href="#experts">Experts</a></h3> |
| <p>Not all <code>t-compiler</code> members are experts on all parts of <code>rustc</code>; |
| it’s a pretty large project. |
| To find out who could have some expertise on |
| different parts of the compiler, <a href="https://github.com/rust-lang/rust/blob/HEAD/triagebot.toml">consult triagebot assign groups</a>. |
| The sections that start with <code>[assign*</code> in <code>triagebot.toml</code> file. |
| But also, feel free to ask questions even if you can’t figure out who to ping.</p> |
| <p>Another way to find experts for a given part of the compiler is to see who has made recent commits. |
| For example, to find people who have recently worked on name resolution since the 1.68.2 release, |
| you could run <code>git shortlog -n 1.68.2.. compiler/rustc_resolve/</code>. |
| Ignore any commits starting with |
| “Rollup merge” or commits by <code>@bors</code> (see <a href="./contributing.html#ci">CI contribution procedures</a> for |
| more information about these commits).</p> |
| <h2 id="what-should-i-work-on"><a class="header" href="#what-should-i-work-on">What should I work on?</a></h2> |
| <p>The <code>rust</code> monorepo is quite large and it can be difficult to know which parts need |
| help, or are a good starting place for beginners. |
| Here are some suggested starting places.</p> |
| <h3 id="easy-or-mentored-issues"><a class="header" href="#easy-or-mentored-issues">Easy or mentored issues</a></h3> |
| <p>If you’re looking for somewhere to start, check out the following <a href="https://github.com/rust-lang/rust/issues?q=is%3Aopen%20is%3Aissue%20org%3Arust-lang%20no%3Aassignee%20label%3AE-easy%2CE-medium%2CE-help-wanted%2CE-mentor%20-label%3AS-blocked%20-linked%3Apr">issue |
| search</a>. |
| See the <a href="https://forge.rust-lang.org/release/issue-triaging.html">Triage</a> for an explanation of these labels. |
| You can also try filtering the search to areas you’re interested in. |
| For example:</p> |
| <ul> |
| <li><code>label:T-compiler</code> will only show issues related to the compiler</li> |
| <li><code>label:A-diagnostics</code> will only show diagnostic issues</li> |
| </ul> |
| <p>Not all important or beginner work has issue labels. |
| See below for how to find work that isn’t labelled.</p> |
| <h3 id="recurring-work"><a class="header" href="#recurring-work">Recurring work</a></h3> |
| <p>Some work is too large to be done by a single person. |
| In this case, it’s common to have “Tracking issues” to co-ordinate the work between contributors. |
| Here are some example tracking issues where |
| it’s easy to pick up work without a large time commitment:</p> |
| <ul> |
| <li><em>Add recurring work items here.</em></li> |
| </ul> |
| <p>If you find more recurring work, please feel free to add it here!</p> |
| <h3 id="diagnostic-issues"><a class="header" href="#diagnostic-issues">Diagnostic issues</a></h3> |
| <p>Many diagnostic issues are self-contained and don’t need detailed background knowledge of the |
| compiler. |
| You can see a list of diagnostic issues <a href="https://github.com/rust-lang/rust/issues?q=is%3Aissue+is%3Aopen+label%3AA-diagnostics+no%3Aassignee">here</a>.</p> |
| <h3 id="picking-up-abandoned-pull-requests"><a class="header" href="#picking-up-abandoned-pull-requests">Picking up abandoned pull requests</a></h3> |
| <p>Sometimes, contributors send a pull request, but later find out that they don’t have enough |
| time to work on it, or they simply are not interested in it anymore. |
| Such PRs are often eventually closed and they receive the <code>S-inactive</code> label. |
| You could try to examine some of these PRs and pick up the work. |
| You can find the list of such PRs <a href="https://github.com/rust-lang/rust/pulls?q=is%3Apr+label%3AS-inactive+is%3Aclosed">here</a>.</p> |
| <p>If the PR has been implemented in some other way in the meantime, the <code>S-inactive</code> label |
| should be removed from it. |
| If not, and it seems that there is still interest in the change, |
| you can try to rebase the pull request on top of the latest <code>main</code> branch and send a new |
| pull request, continuing the work on the feature.</p> |
| <h3 id="writing-tests"><a class="header" href="#writing-tests">Writing tests</a></h3> |
| <p>Issues that have been resolved but do not have a regression test are marked with the <code>E-needs-test</code> label. |
| Writing unit tests is a low-risk, |
| lower-priority task that offers new contributors a great opportunity to familiarize themselves |
| with the testing infrastructure and contribution workflow. |
| You can see a list of needs test issues <a href="https://github.com/rust-lang/rust/issues?q=is%3Aissue%20is%3Aopen%20label%3AE-needs-test%20no%3Aassignee">here</a>.</p> |
| <h3 id="contributing-to-std-standard-library"><a class="header" href="#contributing-to-std-standard-library">Contributing to std (standard library)</a></h3> |
| <p>See <a href="https://std-dev-guide.rust-lang.org/">std-dev-guide</a>.</p> |
| <h3 id="other-ways-to-contribute"><a class="header" href="#other-ways-to-contribute">Other ways to contribute</a></h3> |
| <p>See <a href="https://forge.rust-lang.org/how-to-start-contributing.html#how-to-start-contributing-1">Forge</a>.</p> |
| <h2 id="cloning-and-building"><a class="header" href="#cloning-and-building">Cloning and Building</a></h2> |
| <p>See <a href="./building/how-to-build-and-run.html">“How to build and run the compiler”</a>.</p> |
| <h2 id="bug-fixes-or-normal-code-changes"><a class="header" href="#bug-fixes-or-normal-code-changes">Bug fixes or “normal” code changes</a></h2> |
| <p>For most PRs, no special procedures are needed. |
| You can just <a href="git.html#opening-a-pr">open a PR</a>, and it will be reviewed, approved, and merged. |
| This includes most bug fixes, refactorings, and other user-invisible changes. |
| The next few sections talk about exceptions to this rule.</p> |
| <p>Also, note that it is perfectly acceptable to open WIP PRs or GitHub <a href="https://github.blog/2019-02-14-introducing-draft-pull-requests/">Draft PRs</a>. |
| Some people prefer to do this so they can get feedback along the |
| way or share their code with a collaborator. |
| Others do this so they can utilize |
| the CI to build and test their PR (e.g. when developing on a slow machine).</p> |
| <h2 id="pull-requests"><a class="header" href="#pull-requests">Pull requests</a></h2> |
| <p>Pull requests (or PRs for short) are the primary mechanism we use to change Rust. |
| GitHub itself has some <a href="https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests">great documentation</a> on using the Pull Request feature. |
| We use the <a href="https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/getting-started/about-collaborative-development-models#fork-and-pull-model">“fork and pull” model</a>, |
| where contributors push changes to their personal fork and create pull requests to |
| bring those changes into the source repository. |
| We have <a href="git.html">a chapter</a> on how to use Git when contributing to Rust.</p> |
| <blockquote> |
| <p><strong>Advice for potentially large, complex, cross-cutting and/or very domain-specific changes</strong></p> |
| <p>The compiler reviewers on rotation usually each have areas of the compiler that they know well, |
| but also have areas that they are not very familiar with. If your PR contains changes that are |
| large, complex, cross-cutting and/or highly domain-specific, it becomes very difficult to find a |
| suitable reviewer who is comfortable in reviewing all of the changes in such a PR. This is also |
| true if the changes are not only compiler-specific but also contain changes which fall under the |
| purview of reviewers from other teams, like the standard library team. <a href="https://github.com/rust-lang/rust/blob/HEAD/triagebot.toml">There’s a bot</a> |
| which notifies the relevant teams and pings people who have set up specific alerts based on the |
| files modified.</p> |
| <p>Before making such changes, you are strongly encouraged to <strong>discuss your proposed changes with |
| the compiler team beforehand</strong> (and with other teams that the changes would require approval |
| from), and work with the compiler team to see if we can help you <strong>break down a large potentially |
| unreviewable PR into a series of smaller more individually reviewable PRs</strong>.</p> |
| <p>You can communicate with the compiler team by creating a <a href="https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler">#t-compiler thread on Zulip</a> |
| to discuss your proposed changes.</p> |
| <p>Communicating with the compiler team beforehand helps in several ways:</p> |
| <ol> |
| <li>It increases the likelihood of your PRs being reviewed in a timely manner. |
| <ul> |
| <li>We can help you identify suitable reviewers <em>before</em> you open actual PRs, or help find |
| advisors and liaisons to help you navigate the change procedures, or help with running |
| try-jobs, perf runs and crater runs as suitable.</li> |
| </ul> |
| </li> |
| <li>It helps the compiler team track your changes.</li> |
| <li>The compiler team can perform vibe checks on your changes early and often, to see if the |
| direction of the changes align with what the compiler team prefers to see.</li> |
| <li>Helps to avoid situations where you may have invested significant time and effort into large |
| changes that the compiler team might not be willing to accept, or finding out very late that the |
| changes are in a direction that the compiler team disagrees with.</li> |
| </ol> |
| </blockquote> |
| <h2 id="issue-triage"><a class="header" href="#issue-triage">Issue triage</a></h2> |
| <p>Please see <a href="https://forge.rust-lang.org/release/issue-triaging.html">https://forge.rust-lang.org/release/issue-triaging.html</a>.</p> |
| <h2 id="other-resources"><a class="header" href="#other-resources">Other Resources</a></h2> |
| <p>This section has moved to the <a href="./about-this-guide.html#other-places-to-find-information">“About this guide”</a> chapter.</p> |
| |
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