liftMaybe -package:sbv
Lift a Maybe value into the Unpickler monad.
The 1. arg is the attached error message
Lift a maybe into the
Fail effect, causing failure if it's
Nothing.
Lift a maybe to an Alternative.
Lift a
Maybe value into the
MaybeT monad transformer.
Translate a maybe value into wizard success/failure.
Lift an MaybeK into an MaybeKT.
Lift a Maybe value to a pickler.
Nothing is mapped to the zero pickler, Just x is
pickled with xpLift x.