1 error: to use a constant of type `Foo` in a pattern, `Foo` must be annotated with `#[derive(PartialEq, Eq)]`
2 --> $DIR/ice-6254.rs:12:9
4 LL | FOO_REF_REF => {},
7 = note: `-D indirect-structural-match` implied by `-D warnings`
8 = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
9 = note: for more information, see issue #62411 <https://github.com/rust-lang/rust/issues/62411>
11 error: aborting due to previous error