rust-lang / rust-lang/rust-clippy

`missing_safety_doc` lint doesn't trigger on `extern` block function declarations

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Dominant language
Rust
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Description

extern "C" {
  pub fn __aeabi_memcpy(dest: *mut u8, src: *const u8, byte_count: usize);
}

This doesn't trigger the missing_safety_doc lint, though it probably should.

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Research direction

Start by reproducing the shown Rust example with the missing_safety_doc lint and inspect the lint's handling of extern block function declarations. Done means the declaration triggers the lint with the expected safety-documentation diagnostic, with coverage in the relevant Clippy lint tests.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
38/100

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