error: constant of non-structural type `EnumSet<Enum8>` in a pattern
  --> $DIR/issue-72896-non-partial-eq-const.rs:19:9
   |
LL | enum Enum8 { }
   | ---------- must be annotated with `#[derive(PartialEq)]` to be usable in patterns
...
LL | const CONST_SET: EnumSet<Enum8> = EnumSet { __enumset_underlying: 3 };
   | ------------------------------- constant defined here
...
LL |         CONST_SET => { /* ok */ }
   |         ^^^^^^^^^ 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