error[E0277]: the trait bound `u8: Tr` is not satisfied
  --> $DIR/issue-29595.rs:6:17
   |
LL |     let a: u8 = Tr::C;
   |                 ^^^^^ the trait `Tr` is not implemented for `u8`
   |
help: this trait has no implementations, consider adding one
  --> $DIR/issue-29595.rs:1:1
   |
LL | trait Tr {
   | ^^^^^^^^

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.