error[E0277]: the size for values of type `str` cannot be known at compilation time
  --> $DIR/impl_wf.rs:11:6
   |
LL | trait Foo: Sized { }
   |            ----- required by this bound in `Foo`
...
LL | impl Foo for str { }
   |      ^^^ doesn't have a size known at compile-time
   |
   = help: the trait `std::marker::Sized` is not implemented for `str`

error[E0277]: the trait bound `f32: Foo` is not satisfied
  --> $DIR/impl_wf.rs:27:17
   |
LL | trait Bar {
   |       --- required by a bound in this
LL |     type Item: Foo;
   |                --- required by this bound in `Bar`
...
LL |     type Item = f32;
   |                 ^^^ the trait `Foo` is not implemented for `f32`

error[E0277]: the trait bound `f32: Foo` is not satisfied
  --> $DIR/impl_wf.rs:35:6
   |
LL | trait Baz<U: ?Sized> where U: Foo { }
   |                               --- required by this bound in `Baz`
...
LL | impl Baz<f32> for f32 { }
   |      ^^^^^^^^ the trait `Foo` is not implemented for `f32`

error: aborting due to 3 previous errors

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