Processing as TTImp Written TTC Yaffle> Bye for now! Processing as TTImp Vect2.yaff:25:1--26:1:{pat 0 {b:27} : Type} => {pat 0 {a:26} : Type} => ($resolved186 {b:27}[1] {a:26}[0] $resolved168 ($resolved177 {a:26}[0]) ($resolved177 {b:27}[1])) is not a valid impossible pattern because it typechecks Yaffle> Bye for now! Processing as TTImp Vect3.yaff:25:1--26:1:Not a valid impossible pattern: Vect3.yaff:25:9--25:11:When unifying: $resolved167 and ($resolved175 ?Main.{n:21}_[] ?Main.{b:19}_[]) Vect3.yaff:25:9--25:11:Type mismatch: $resolved167 and ($resolved175 ?Main.{n:21}_[] ?Main.{b:19}_[]) Yaffle> Bye for now!