File: no-eq-branch-fail.stderr

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error: constant of non-structural type `Foo` in a pattern
  --> $DIR/no-eq-branch-fail.rs:19:9
   |
LL | enum Foo {
   | -------- `Foo` must be annotated with `#[derive(PartialEq)]` to be usable in patterns
...
LL | const BAR_BAZ: Foo = if 42 == 42 {
   | ------------------ constant defined here
...
LL |         BAR_BAZ => panic!(),
   |         ^^^^^^^ constant of non-structural type
   |
   = note: see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details

error: aborting due to 1 previous error