error: constant of non-structural type `B` in a pattern
  --> $DIR/issue-62307-match-ref-ref-forbidden-without-eq.rs:35:9
   |
LL | struct B(i32);
   | -------- `B` must be annotated with `#[derive(PartialEq)]` to be usable in patterns
...
LL |     const RR_B1: & & B = & & B(1);
   |     ------------------ constant defined here
...
LL |         RR_B1 => { println!("CLAIM RR0: {:?} matches {:?}", RR_B1, RR_B0); }
   |         ^^^^^ constant of non-structural type
   |
note: the `PartialEq` trait must be derived, manual `impl`s are not sufficient; see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details
  --> $DIR/issue-62307-match-ref-ref-forbidden-without-eq.rs:22:1
   |
LL | impl PartialEq for B {
   | ^^^^^^^^^^^^^^^^^^^^

error: constant of non-structural type `B` in a pattern
  --> $DIR/issue-62307-match-ref-ref-forbidden-without-eq.rs:42:9
   |
LL | struct B(i32);
   | -------- `B` must be annotated with `#[derive(PartialEq)]` to be usable in patterns
...
LL |     const RR_B1: & & B = & & B(1);
   |     ------------------ constant defined here
...
LL |         RR_B1 => { println!("CLAIM RR1: {:?} matches {:?}", RR_B1, RR_B1); }
   |         ^^^^^ constant of non-structural type
   |
note: the `PartialEq` trait must be derived, manual `impl`s are not sufficient; see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details
  --> $DIR/issue-62307-match-ref-ref-forbidden-without-eq.rs:22:1
   |
LL | impl PartialEq for B {
   | ^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors