| error: to use a constant of type `Opaque` in a pattern, `Opaque` must be annotated with `#[derive(PartialEq, Eq)]` | |
| --> $DIR/issue-78057.rs:12:9 | |
| | | |
| LL | FOO => {}, | |
| | ^^^ | |
| | | |
| = note: the traits must be derived, manual `impl`s are not sufficient | |
| = note: see https://doc.rust-lang.org/stable/std/marker/trait.StructuralEq.html for details | |
| error: aborting due to 1 previous error | |