fix handling on associated type bounds

[calebcartwright]

Fixes #3657 and fixes #3660

[calebcartwright]

I still need to add tests, but not entirely sure where they should go

[topecongiro]

Thank you for the PR!

Assuming that's the correct/expected behavior, where should I add tests for that? Should they go under an issue-3657 directory under ./tests/source/ and ./tests/target/?

You could add tests to existing files (e.g., source/type.rs and target/type.rs) or create new ones (e.g., source/associated_type_bounds.rs and target/associated_type_bounds.rs). We do not have a strict naming convention. They could be any name as long as the suffix of their file path matches.

[calebcartwright]

Tests added, thanks @scampi and @topecongiro!

[scampi]

LGTM!