error[E0223]: ambiguous associated type
  --> $DIR/issue-107087.rs:16:5
   |
LL |     A::B::<>::C
   |     ^^^^^^^^
   |
help: use fully-qualified syntax
   |
LL -     A::B::<>::C
LL +     <A<_> as Foo>::B::<>::C
   |

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0223`.