rustperf Rust performance guide (v0)rustperf rule ids (slugs)rustperf corpus targets rustperf evidence policy

rs-alloc-hot — alloc/clone in loop (Vec::new / .clone / to_string / to_owned)rs-clock-hot — measured, still hint rs-collect-vec-hot — collect::<Vec<_>> in loop vs .count()rs-file-open-hot — measured, still hint rs-format-rebind-hot — format! rebind accumulation in loop rs-map-new-hot — measured, hint rs-println-hot — writeln/println each iter vs buffer then write rs-regex-new-hot — measured, still hint

rs-alloc-in-loop — renamed 2026-10-27 (Asia/Shanghai)rs-clock-in-loop — renamed 2026-10-27 (Asia/Shanghai)rs-collect-vec-in-loop — renamed 2026-10-27 (Asia/Shanghai)rs-file-open-in-loop — renamed 2026-10-27 (Asia/Shanghai)rs-format-rebind-in-loop — renamed 2026-10-27 (Asia/Shanghai)rs-map-new-in-loop — renamed 2026-10-27 (Asia/Shanghai)rs-println-in-loop — renamed 2026-10-27 (Asia/Shanghai)rs-regex-new-in-loop — renamed 2026-10-27 (Asia/Shanghai)rs-string-plus-in-loop — String += / push_str in loop rs-string-plus-in-loop — removed 2026-10-23 (Asia/Shanghai)rs-vec-no-capacity — Vec::new + push vs with_capacity rs-vec-no-capacity — removed 2026-10-23 (Asia/Shanghai)

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rs-format-rebind-in-loop — renamed 2026-10-27 (Asia/Shanghai)

Status: renamed to rs-format-rebind-hot. The old slug is a tombstone and must never be reused.

Reason: default matching is --scope all (not loop-only). Slug names that contain in-loop mislead humans and models into treating non-loop sites as out of scope.

Active rule: rs-format-rebind-hot. Opt in to --scope loop (or kit-equivalent) for the former in-loop-only match where supported.

rs-file-open-in-loop — renamed 2026-10-27 (Asia/Shanghai)

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