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Topics: Rust Full archive →

The Wire · Showcase

COROUTINE MIR BUG FIX LANDS, BORROWCK INTERNALS CLEANED UP

By RepoJournal · Filed · About Rust

bors Jacob Pratt Jonathan Brouwer RalfJung Takayuki Maeda
5 people shipped this
bors @bors 3 cited Jacob Pratt @jhpratt 3 cited Jonathan Brouwer @JonathanBrouwer 1 cited RalfJung @RalfJung Takayuki Maeda @TaKO8Ki

An unsound analysis in coroutine MIR saved local remapping just shipped, plugging a hole discovered while working on async-drop code.

The fix [1] addresses a critical flaw where the counter variable in array drop glue wasn't correctly identified as a saved local, and indices in ProjectionElem::Index weren't being patched when those locals were saved. This was found during async-drop development and represents real soundness risk. In related compiler work, the borrowck module got a structural cleanup [2] that removes the entire BlameConstraint struct by using vector indices to reference OutlivesConstraint instead, making the code simpler without changing behavior. Bootstrap also received a small but meaningful refactor [3] replacing ShouldRun::crates with crate_or_deps_filtered, addressing a long-standing TODO in the build system. Language-side, track_caller support now works on extern function item declarations [4], filling in a gap where the catch-all attr handler was incorrectly rejecting the attribute. Across crates.io-index, routine crate updates continue [5][6][7].

Action items

References

  1. [1] Rollup merge of #158655 - dingxiangfei2009:fix-remapping, r=dingxiangfei2009 rust-lang/rust
  2. [2] Rollup merge of #159201 - Enselic:best-blame-index, r=jieyouxu rust-lang/rust
  3. [3] Rollup merge of #159205 - Zalathar:crate-or-deps, r=jieyouxu rust-lang/rust
  4. [4] Rollup merge of #158535 - cezarbbb:eii-track-caller, r=bjorn3 rust-lang/rust
  5. [5] Update crate `oximedia-repair` rust-lang/crates.io-index
  6. [6] Update crate `geometry-derive` rust-lang/crates.io-index
  7. [7] Update crate `yog-api` rust-lang/crates.io-index

Quick answers

What shipped in Rust on July 14, 2026?
An unsound analysis in coroutine MIR saved local remapping just shipped, plugging a hole discovered while working on async-drop code. In total, 106 commits and 17 pull requests landed.
Who contributed to Rust on July 14, 2026?
5 developers shipped this update, including bors, RalfJung, Jacob Pratt, Takayuki Maeda, and Jonathan Brouwer.
What were the notable Rust updates?
Rollup merge of #158655 - dingxiangfei2009:fix-remapping, r=dingxiangfei2009, Rollup merge of #159201 - Enselic:best-blame-index, r=jieyouxu, and Rollup merge of #159205 - Zalathar:crate-or-deps, r=jieyouxu.

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