error[E0277]: the trait bound `A<_>: Bar<_>` is not satisfied --> $DIR/unused-substs-1.rs:12:13 | LL | let _ = A; | ^ the trait `Bar<_>` is not implemented for `A<_>` | = help: the trait `Bar<_>` is implemented for `A<7>` note: required by a bound in `A` --> $DIR/unused-substs-1.rs:9:11 | LL | struct A | - required by a bound in this unit struct LL | where LL | A: Bar; | ^^^^^^ required by this bound in `A` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.