2019-10-24 Compiler Team Triage Meeting

Oct. 30, 2019 · Wesley Wiser on behalf of the compiler team

The compiler team had our weekly triage meeting on 2019-10-24. You can find the minutes on the compiler-team repository. Each week, we have general announcements from the team followed by check-ins from two fo the compiler team working groups.


  • @simulacrum landed the rust-std split PR which decreases the size of the rustc-dev rustup component #65474

Working group sync


  • Rust 1.40 (current nightly) will be the first stable release without the HIR borrow checker. This means Non Lexical Lifetimes will be available on Rust 2015.

  • At this point, wg-nll has completed its purpose and will be disbanded.

    • wg-polonius is still going strong though!

Link to full discussion


  • Work is proceeding slowly but steadily. There are regular triage meetings every Monday on the compiler calendar.

  • The current goal is to refactor/audit compiler locks and other parts of the parallel query system and to investigate improving performance.

  • The current MVP is to do high-level parallelization in a few critical places such as typechecking & linting.

  • Currently, we're not seeing the speedups we want from parallelization but work is ongoing to remove locking and improve the jobserver integration.

  • Video recording of last meeting

Link to full discussion