error: to use a constant of type `Foo` in a pattern, `Foo` must be annotated with `#[derive(PartialEq, Eq)]` --> $DIR/ice-6254.rs:13:9 | LL | FOO_REF_REF => {}, | ^^^^^^^^^^^ | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #62411 = 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 = note: `-D indirect-structural-match` implied by `-D warnings` = help: to override `-D warnings` add `#[allow(indirect_structural_match)]` error: aborting due to 1 previous error