error[E0220]: associated type `Assoc` not found for `V`
  --> $DIR/not_well_formed.rs:10:29
   |
LL | type Foo<V> = impl Trait<V::Assoc>;
   |                             ^^^^^ associated type `Assoc` not found

error: aborting due to previous error

For more information about this error, try `rustc --explain E0220`.