src/test/ui/consts/match_ice.stderr

   1 error: to use a constant of type `S` in a pattern, `S` must be annotated with `#[derive(PartialEq, Eq)]`
   2   --> $DIR/match_ice.rs:11:9
   3    |
   4 LL |         C => {}
   5    |         ^
   6
   7 error: aborting due to previous error
   8