error[E0599]: no method named `foo` found for struct `Bar` in the current scope
  --> $DIR/issue-21659-show-relevant-trait-impls-3.rs:20:8
   |
LL | struct Bar;
   | ---------- method `foo` not found for this struct
...
LL |     f1.foo(1usize);
   |        ^^^ method not found in `Bar`
   |
   = help: items from traits can only be used if the trait is implemented and in scope
note: `Foo` defines an item `foo`, perhaps you need to implement it
  --> $DIR/issue-21659-show-relevant-trait-impls-3.rs:1:1
   |
LL | trait Foo<A> {
   | ^^^^^^^^^^^^

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0599`.