error[E0308]: mismatched types
  --> $DIR/issue-31910.rs:3:9
   |
LL |     X = Trait::Number,
   |         ^^^^^^^^^^^^^ expected `isize`, found `i32`

error[E0392]: type parameter `T` is never used
  --> $DIR/issue-31910.rs:1:11
   |
LL | enum Enum<T: Trait> {
   |           ^ unused type parameter
   |
   = help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0308, E0392.
For more information about an error, try `rustc --explain E0308`.