From: src/test/ui/codemap_tests/two_files.rs Error E0404 needs a span_label, updating it from: ``` error[E0404]: `Bar` is not a trait --> src/test/ui/codemap_tests/two_files.rs:16:6 | 16 | impl Bar for Baz { } | ^^^ | = note: type aliases cannot be used for traits ``` to: ``` error[E0404]: `Bar` is not a trait --> src/test/ui/codemap_tests/two_files.rs:16:6 | 16 | impl Bar for Baz { } | ^^^ not a trait | = note: type aliases cannot be used for traits ``` Note: this is a UI test, so you'll need to update the corresponding `src/test/ui/codemap_tests/two_files.stderr` file. You can test the UI tests by running: ``` python src/bootstrap/bootstrap.py --stage 1 --step check-ui ```