| error: to use a constant of type `Cow<'_, str>` in a pattern, `Cow<'_, str>` must be annotated with `#[derive(PartialEq)]` | |
| --> $DIR/issue-89088.rs:16:9 | |
| | | |
| LL | FOO => todo!(), | |
| | ^^^ | |
| | | |
| = note: the traits must be derived, manual `impl`s are not sufficient | |
| = note: see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details | |
| error: aborting due to 1 previous error | |