error[E0220]: associated type `unknown` not found for `T`
  --> $DIR/unknown-assoc-with-const-arg.rs:4:21
   |
LL |     fn a<T>() -> T::unknown<{}> {}
   |                     ^^^^^^^ associated type `unknown` not found

error[E0220]: associated type `unknown` not found for `T`
  --> $DIR/unknown-assoc-with-const-arg.rs:14:18
   |
LL |     fn a() -> T::unknown<{}> {}
   |                  ^^^^^^^ associated type `unknown` not found

error[E0433]: failed to resolve: use of undeclared type `NOT_EXIST`
  --> $DIR/unknown-assoc-with-const-arg.rs:9:15
   |
LL |     fn a() -> NOT_EXIST::unknown<{}> {}
   |               ^^^^^^^^^ use of undeclared type `NOT_EXIST`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0220, E0433.
For more information about an error, try `rustc --explain E0220`.