error[E0277]: the trait bound `T: Bound` is not satisfied
  --> $DIR/issue-21837.rs:18:9
   |
LL | impl<T> Trait2 for Foo<T> {} //~ ERROR the trait bound `T: Bound` is not satisfied
   |         ^^^^^^ the trait `Bound` is not implemented for `T`
   |
   = help: consider adding a `where T: Bound` bound
note: required by `Foo`
  --> $DIR/issue-21837.rs:12:1
   |
LL | pub struct Foo<T: Bound>(T);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

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