error: enum with generic parameters is not supported
 --> tests/ui/generic_enum.rs:3:5
  |
3 |     enum A<T> {
  |     ^^^^^^^^^

error: enum with generic parameters is not supported
 --> tests/ui/generic_enum.rs:7:5
  |
7 |     enum B<T> where T: Copy {
  |     ^^^^^^^^^

error: enum with where-clause is not supported
  --> tests/ui/generic_enum.rs:11:12
   |
11 |     enum C where void: Copy {
   |            ^^^^^^^^^^^^^^^^