error[E0222]: ambiguous associated constant `K` in bounds of `Trait0`
  --> $DIR/ambiguity.rs:12:25
   |
LL |     type const K: ();
   |     ----------------
   |     |
   |     ambiguous `K` from `Parent0<u32>`
   |     ambiguous `K` from `Parent0<i32>`
...
LL | fn take0(_: impl Trait0<K = const { }>) {}
   |                         ^^^^^^^^^^^^^ ambiguous associated constant `K`
   |
   = help: consider introducing a new type parameter `T` and adding `where` constraints:
               where
                   T: Trait0,
                   T: Parent0<u32>::K = const { },
                   T: Parent0<i32>::K = const { }

error[E0222]: ambiguous associated constant `C` in bounds of `Trait1`
  --> $DIR/ambiguity.rs:23:25
   |
LL |     type const C: i32;
   |     ----------------- ambiguous `C` from `Parent1`
...
LL |     type const C: &'static str;
   |     -------------------------- ambiguous `C` from `Parent2`
...
LL | fn take1(_: impl Trait1<C = "?">) {}
   |                         ^^^^^^^ ambiguous associated constant `C`
   |
   = help: consider introducing a new type parameter `T` and adding `where` constraints:
               where
                   T: Trait1,
                   T: Parent2::C = "?",
                   T: Parent1::C = "?"

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0222`.