What it does

Rust 1.80.0 allows writing unsafe extern under feature(unsafe_extern_blocks), Rust 1.82.0 stabilizes it, and Edition 2024 will require it. Thus it would be nice to have a lint that ensures // SAFETY comments are in place.

undocumented_unsafe_blocks covers not just unsafe blocks (at least currently), so it could make sense to put it there, but it may make more sense to avoid adding more things into that one.

Advantage

No response

Drawbacks

No response

Example

unsafe extern {}

Should be written as:

// SAFETY: ...
unsafe extern {}