Language edition/toolchain drift
Rust 2024 unsafe extern blocks edition guide
Edition migration turns a previously valid FFI declaration into a compiler error.
Agent Quick Fix
Repair against the current Rust 2024 contract, then keep the change narrow and source-backed.
Product: Rust 2024
Current-contract area: FFI `extern` block requires `unsafe`
Likely root cause: Edition migration turns a previously valid FFI declaration into a compiler error.
Repair direction: Verifier checks idiomatic migration while preserving cross-version intent where required.Symptom
Edition migration turns a previously valid FFI declaration into a compiler error.
Why This Happens
Source may compile under an older edition/toolchain; current edition migration rules and tool metadata are external to the repo's immediate error context.
Common Wrong Fixes
- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.
Codex Search Keywords
These are the search terms observed in a neutral Codex validation run for this failure shape.
Rust 2024 unsafe extern blocks edition guide
https://doc.rust-lang.org/edition-guide/rust-2024/unsafe-extern.html