Tracking Issue: Polonius Alpha on nightly
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@jackh726 is already working on this.
Since Aug 3, 2026.
C-tracking-issue
- Dominant language
- Rust
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Description
This is intended to be a "tracking issue" for anything related to enabling Polonius Alpha on nightly ahead of stabilization.
If you encounter an issue (a bug, unsoundness, or significant performance regression) related to the borrow checker while Polonius Alpha is enabled, please feel free to post here. Issues requiring longer discussion can also be discussed on Zulip.
Status: Enabled on nightly (starting nightly-2026-08-06)
Relevant links:
- Blog post: https://blog.rust-lang.org/2026/08/04/enabling-polonius-alpha-on-nighty/
- Zulip stream for discussion: https://rust-lang.zulipchat.com/#narrow/channel/186049-t-types.2Fpolonius/topic/Polonius.20Alpha.20enabled.20on.20nightly/near/614373312
- Enabling PR: https://github.com/rust-lang/rust/pull/159343
- MCP: https://github.com/rust-lang/compiler-team/issues/1015
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Assessment
This issue has not been assessed yet.