`allow_attributes` Lint does not trigger on `#[allow(warnings)]`

Summary

This is probably a bit weird, but I found this in some code: #[allow(warnings)] annotated on a function to mute all warnings in it. Now I am using the clippy::allow_attributes Lint and expected to be forced to write expect. But nothing like this happened.

Lint Name

allow_attributes

Reproducer

I tried this code:

#[allow(warnings)]
fn foo(input: &str) {
    let _first_value = input.split(',').nth(0).unwrap();
}

I expected to see this happen:

clippy telling me to write expect instead of allow

Instead, this happened:

the warning was muted so the allow(warnings) seems to be something valid, but clippy did not instruct me to use expect

Version

rustc 1.83.0-nightly (f79a912d9 2024-09-18)
binary: rustc
commit-hash: f79a912d9edc3ad4db910c0e93672ed5c65133fa
commit-date: 2024-09-18
host: x86_64-unknown-linux-gnu
release: 1.83.0-nightly
LLVM version: 19.1.0

Start at the allow_attributes lint entry point and reproduce the issue with the Rust snippet in this report. Done means the lint reports #[allow(warnings)] and recommends expect as described, with the existing behavior checked against the reproducer.