fuzz: RUSTC_WRAPPER must exec the rustc Cargo passed - #326
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September 4, 2026 11:05
Cargo invokes `$WRAPPER $RUSTC <args>`. Prefixing another `rustc` made nightly probe fail with "multiple input filenames" (rustc path and `-`). Both fuzz jobs died before compile. Exec `"$@" -A warnings` instead.
NixOS has no /bin/echo; the wrapper protocol pin must not assume a FHS echo. A tiny sh helper is enough.
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Cause
workflow_dispatchafter #324 failed in ~40s on both jobs:RUSTC_WRAPPERis$WRAPPER $RUSTC <args>. The script didexec rustc "$@", so rustc saw its own path as an input file.Fix
exec "$@" -A warnings. Pin infuzz-run.test.sh. No workflow YAML.Re-dispatch
fuzzafter merge.