error[E0322]: explicit impls for the `DiscriminantKind` trait are not permitted
  --> $DIR/forbidden-discriminant-kind-impl.rs:9:1
   |
LL | impl DiscriminantKind for NewType {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ impl of `DiscriminantKind` not allowed

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0322`.