fix(ci): pin fuzz toolchain to nightly explicitly#98
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fuzz.yml pins `dtolnay/rust-toolchain` to a SHA (supply-chain safety) with a `# nightly` comment. That action derives the channel from its ref, and a SHA ref can't convey "nightly", so the action falls back to stable. cargo-fuzz then fails to build every target with "the option `Z` is only accepted on the nightly compiler" (it needs `-Z sanitizer=address`). The current pinned SHA happens to still resolve nightly, but the pending Dependabot bump (#93) to a newer SHA surfaced the latent break — all four fuzz jobs failed on that PR while ci.yml (legitimately stable) passed. Set `toolchain: nightly` explicitly so the channel no longer depends on which SHA the action is pinned to. This unblocks the Dependabot action bump. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This was referenced Jun 17, 2026
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Problem
All four fuzz jobs fail to build whenever
dtolnay/rust-toolchainis pinned to a SHA that the action doesn't resolve as nightly:fuzz.ymlpins the action to a SHA (supply-chain safety) with only a# nightlycomment. The action derives its channel from the ref it's called with, and a SHA can't convey "nightly", so it falls back to stable — but cargo-fuzz needs nightly (-Z sanitizer=address).The current pinned SHA still happens to resolve nightly, so main is green. The pending Dependabot bump (#93) to a newer SHA surfaced the latent break: all 4 fuzz jobs failed on #93 while every
ci.ymljob (legitimately stable) passed.Fix
Set
toolchain: nightlyexplicitly on the fuzzrust-toolchainstep, so the channel no longer depends on which SHA the action is pinned to. This unblocks the Dependabot action bump (#93).Verification
This PR's own
fuzzjobs (lexer, parser, roundtrip, sql) are the test — they must go green with the explicit nightly channel.🤖 Generated with Claude Code
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