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b54c60b76a
Found by accident, and worse than the bug that found it. Five deliberately
broken decode cases came back green through `build.lua --test --isa x86`, while
running the same suite directly reported "253/258 PASSED, 5 FAILED".
Two independent holes, both open, so neither backstopped the other:
- the x86 test binary ended at `print_summary()` and never called `os.exit`,
so it exited 0 no matter how many cases failed;
- `do_test` looked for the words "N failed" in the output, and the x86
harness prints "N FAILED" — a lowercase-only Lua pattern, so the largest
suite in the tree was exempt from its own gate.
The exit code is the check that should have been load-bearing, so the harness
sets it. The output match stays as a backstop for a suite that forgets to, and
is now case-insensitive.
How long this has been true is not knowable from here — every x86 regression
since the pattern was written would have been reported as PASS.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Riok9vMpkLmo78wsVKJHhz