Fix #98260

[yanchen4791]

Fixes #98260

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @petrochenkov (or someone else) soon.

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[compiler-errors]

@yanchen4791 this needs a test at least

[yanchen4791]

Please note that the fix is for #98260 (not 98062).

[spastorino]

@yanchen4791 you would probably want to place a test somewhere inside src/test/ui/ with the following ...

fn main() {}

trait A {
    fn a(aa: B) -> Result<_, B> {
        Ok(())
    }
}

enum B {}

And proper error proves. Check how tests are layed out in src/test/ui

[spastorino]

And you would need to rustfmt the changed file.

[yanchen4791]

@yanchen4791 this needs a test at least

@compiler-errors A test case has been added.

[spastorino]

@bors r+

[bors]

📌 Commit f97326d has been approved by spastorino

[jackh726]

@bors rollup=never

This might have a perf effect