error[E0277]: the trait bound `Bar: Foo<usize>` is not satisfied
  --> $DIR/issue-21659-show-relevant-trait-impls-1.rs:34:8
   |
34 |     f1.foo(1usize);
   |        ^^^ the trait `Foo<usize>` is not implemented for `Bar`
   |
   = help: the following implementations were found:
             <Bar as Foo<i32>>
             <Bar as Foo<u8>>

error: aborting due to previous error(s)