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