---
focus: regression
reviewer: Reviewer
timestamp: 2026-05-21T14:03:35Z
pr: 247
branch: feat/195-bm25f-bench
head: 101385eb
---

# Regression Review

## Summary

This PR adds a new `rskim-bench` crate (3,704 lines, 89 tests) to the workspace. It is purely additive -- no existing crate source files, CI workflows, or feature flags were modified. The only changes to existing files are the workspace `Cargo.toml` (adding the new member) and `Cargo.lock` (adding the new package entry with no version changes to existing dependencies). All 4,327 workspace tests pass, clippy reports zero warnings, and `cargo-dist` correctly excludes the bench crate from release artifacts.

## Findings

No blocking, should-fix, or informational regression issues found.

### Verification checklist

| Check | Result |
|-------|--------|
| Existing crate source files modified | None |
| Removed exports | None |
| Changed function signatures | None |
| CI workflow changes | None |
| Feature flag changes | None |
| Dependency version conflicts | None -- all bench deps use `{ workspace = true }` |
| New transitive dependencies in Cargo.lock | None -- all deps already in workspace |
| Binary name conflicts | None -- `rskim-bench` is unique |
| cargo-dist release artifacts affected | No -- `publish = false`, no dist metadata |
| `cargo check --workspace` | Clean (0 errors, 0 warnings) |
| `cargo test --all-features` | 4,327 pass, 0 fail |
| `cargo clippy --workspace` | 0 warnings, 0 errors |
| Integration tests use external resources | No -- all synthetic/in-memory |
| Edition consistency | All crates use edition 2024 |

## Verdict

APPROVE

No regression risk detected. The change is strictly additive -- a new workspace member with `publish = false` that introduces no modifications to existing code, no dependency version changes, and no CI configuration changes. The bench crate's tests are self-contained (synthetic data, no network/filesystem fixtures) and will be stable additions to the CI test suite.
