(unknownPredicate: StringAdd).self
(unknownPredicate: StringFormat).self
(unknownPredicate: ArrowAssoc[UnknownPredicate]).x
(Since version 2.10.0) Use leftOfArrow
instead
(unknownPredicate: Ensuring[UnknownPredicate]).x
(Since version 2.10.0) Use resultOfEnsuring
instead