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error: constant of non-structural type `Cow<'_, str>` in a pattern
--> $DIR/issue-89088.rs:16:9
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LL | const FOO: &A = &A::Field(Cow::Borrowed("foo"));
| ------------- constant defined here
...
LL | FOO => todo!(),
| ^^^ constant of non-structural type
--> $SRC_DIR/alloc/src/borrow.rs:LL:COL
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= note: `Cow<'_, str>` must be annotated with `#[derive(PartialEq)]` to be usable in patterns
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= note: see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details
error: aborting due to 1 previous error
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