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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: unreachable pattern
  --> $DIR/issue-78057.rs:14:9
   |
LL |         FOO => {},
   |         --- matches any value
LL |
LL |         _ => {}
   |         ^ unreachable pattern
   |
note: the lint level is defined here
  --> $DIR/issue-78057.rs:1:9
   |
LL | #![deny(unreachable_patterns)]
   |         ^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors