Bless tests

Author: mu001999

tests/ui/associated-consts/assoc-const-eq-ambiguity.stderr

@@ -27,6 +27,12 @@ LL |     const C: &'static str;
 ...
 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