error[E0223]: ambiguous associated constant
  --> $DIR/ambiguous-assoc-const.rs:10:20
   |
LL | fn foo() -> Blah<{ Tr::N }> {
   |                    ^^^^^
   |
help: if there were a type named `Example` that implemented `Tr`, you could use the fully-qualified path
   |
LL - fn foo() -> Blah<{ Tr::N }> {
LL + fn foo() -> Blah<{ <Example as Tr>::N }> {
   |

error: aborting due to 1 previous error

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