error[E0019]: constant contains unimplemented expression type
  --> $DIR/single_variant_match_ice.rs:6:5
   |
LL |     Foo::Prob => 42,
   |     ^^^^^^^^^

error[E0019]: constant contains unimplemented expression type
  --> $DIR/single_variant_match_ice.rs:10:5
   |
LL |     x => 42,
   |     ^

error[E0723]: `if`, `match`, `&&` and `||` are not stable in const fn (see issue #57563)
  --> $DIR/single_variant_match_ice.rs:18:13
   |
LL |             Prob => 0x1,
   |             ^^^^
   |
   = help: add #![feature(const_fn)] to the crate attributes to enable

error: aborting due to 3 previous errors

Some errors occurred: E0019, E0723.
For more information about an error, try `rustc --explain E0019`.