error[E0277]: the trait bound `T: Bound` is not satisfied
  --> $DIR/issue-21837.rs:8:9
   |
LL | pub struct Foo<T: Bound>(T);
   | ---------------------------- required by `Foo`
...
LL | impl<T> Trait2 for Foo<T> {}
   |      -  ^^^^^^ the trait `Bound` is not implemented for `T`
   |      |
   |      help: consider restricting this bound: `T: Bound`

error: aborting due to previous error

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