rust/tests/ui/consts/issue-89088.stderr

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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