Issues

• TypeScript: worker overlays symlink the build output, so worker builds write through to the real tree and parallel workers race — both false SURVIVED and false KILLED

  unclebob/mutator#31 · Filter by author columforge opened on Nov 6, 2026

• TypeScript: a test that imports its module as '.' or '..' is linked, not copied, so its mutants are reported SURVIVED

  unclebob/mutator#29 · Filter by author MatthewRamsey opened on Nov 3, 2026

• Go: in a go.work workspace or with a relative replace, workers cannot build, so every mutant counts as KILLED

  unclebob/mutator#27 · Filter by author vrazdalovschi opened on Nov 1, 2026

• test_git_status_keeps_real_names_and_fails_closed fails when git output is translated

  unclebob/mutator#24 · Filter by author D4rk4 opened on Oct 30, 2026
  1

• A differential run can carry a killed outcome onto a surviving mutant and exit 0

  unclebob/mutator#21 · Filter by author andrewmolyuk opened on Oct 30, 2026
  1

• Edits made to the file under test during a run are reverted when the run ends

  unclebob/mutator#20 · Filter by author andrewmolyuk opened on Oct 30, 2026

• Tests that import through a linked directory test the original file, so mutants are reported SURVIVED (Python: tests/../src)

  unclebob/mutator#19 · Filter by author brendanphall opened on Oct 29, 2026
  2

• Mutants that do not compile count as KILLED, which inflates the score (Go: + on strings)

  unclebob/mutator#18 · Filter by author szybnev opened on Oct 28, 2026

• Go: a full run grows GOCACHE without bound (235 GB) and fills the disk

  unclebob/mutator#17 · Filter by author szybnev opened on Oct 28, 2026

• With --lines, uncovered sites of the whole file are still listed and counted

  unclebob/mutator#13 · Filter by author lohmag opened on Oct 28, 2026

• Workers leave out source in a directory named build, out, dist, target or coverage, so every mutant is reported KILLED

  unclebob/mutator#12 · Filter by author lohmag opened on Oct 28, 2026

• Python: is, in, @, //, %, ** and += are never mutated

  unclebob/mutator#10 · Filter by author dvokhmintsev opened on Oct 27, 2026

• Python: mutants in an uncovered elif condition are run and reported as SURVIVED

  unclebob/mutator#9 · Filter by author dvokhmintsev opened on Oct 27, 2026

• Kotlin mutation testing

  unclebob/mutator#6 · Filter by author aminHZDEV opened on Oct 26, 2026

• Java mutation testing does not work on Gradle projects

  unclebob/mutator#3 · Filter by author aminHZDEV opened on Oct 26, 2026

• Go: coverage profile is never matched, so every site is reported uncovered and the run exits 0

  unclebob/mutator#2 · Filter by author philipjkim opened on Oct 24, 2026

• Rust: parallel workers report surviving mutants as KILLED (cold compile hits the timeout)

  unclebob/mutator#1 · Filter by author camilo-polytropic opened on Oct 2, 2026
  1