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Improve alloc `Vec::retain_mut` performance - #149784

Merged

bors merged 2 commits into

rust-lang:mainfrom

fereidani:retain_mut

Jan 5, 2026

Commits on Jan 5, 2026
- Add feature flag `likely/unlikely` for alloc
  fereidani
  committed
  0330cc2
- Improve and optimize retain_mut implementation
  fereidani
  committed
  bd79ea1