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rust/tests/ui/issues
Matthias Krüger ae7615039f Rollup merge of #134536 - Urgau:fn-ptr-option, r=compiler-errors,traviscross
Lint on fn pointers comparisons in external macros

This PR extends the recently stabilized `unpredictable_function_pointer_comparisons` lint ~~to also lint on `Option<{function pointer}>` and~~ as well as linting in external macros (as to catch `assert_eq!` and others).

```rust
assert_eq!(Some::<FnPtr>(func), Some(func as unsafe extern "C" fn()));
//~^ WARN function pointer comparisons

#[derive(PartialEq, Eq)]
struct A {
    f: fn(),
    //~^ WARN function pointer comparisons
}
```

Fixes https://github.com/rust-lang/rust/issues/134527
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