(fastTrackEntry: StringAdd).self
(fastTrackEntry: StringFormat).self
(fastTrackEntry: ArrowAssoc[(FastTrack.this)#FastTrackEntry]).x
(Since version 2.10.0) Use leftOfArrow
instead
(fastTrackEntry: Ensuring[(FastTrack.this)#FastTrackEntry]).x
(Since version 2.10.0) Use resultOfEnsuring
instead