liftMaybe -package:sbv

Lift a Maybe value into the Unpickler monad. The 1. arg is the attached error message
Lift a Maybe computation into the ExceptT monad.
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.
Lifts a Maybe into any MonadError error. This function injects the passed option if the Maybe is Nothing.
Translate a maybe value into wizard success/failure.
liftMaybe in a lifted Monad
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.