test(elm): retry elm make after clearing elm-stuff#2963
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The Elm compiler's per-project cache locking is flaky under heavy
parallel load ("elm-stuff/0.19.2/d.dat: withBinaryFile: resource busy
(file is locked)", elm/compiler#2258, seen in CI run 29758296129). The
canonical workaround is to delete elm-stuff and rebuild; do that
automatically on the first compile failure. The retry rebuilds
dependencies from the warmed shared ELM_HOME, so it only costs time
when the flake actually strikes.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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CI run 29758296129 (on #2800) failed with the Elm compiler's internal cache-locking flake:
This is a long-standing upstream issue (elm/compiler#2258, same message/file; related cache-corruption family: #2075, #2134, #1845) that 0.19.2 did not fix. Our
Warmup.elmmitigation covers the shared ELM_HOME race but not the per-run-directoryelm-stufflock.Mitigation: on compile failure, delete the run directory's
elm-stuffand retry once — the canonical workaround for this bug family. Costs nothing when the compile succeeds; a couple of seconds of dependency rebuild from the warmed ELM_HOME when the flake strikes.Test-harness-only change; no generated output is affected.
🤖 Generated with Claude Code