WantedConstraints, emptyWanteds, andWanteds, extendWanteds,
WantedConstraint(..), WantedEvVar(..), wantedEvVarLoc,
wantedEvVarToVar, wantedEvVarPred, splitWanteds,
WantedConstraints, emptyWanteds, andWanteds, extendWanteds,
WantedConstraint(..), WantedEvVar(..), wantedEvVarLoc,
wantedEvVarToVar, wantedEvVarPred, splitWanteds,