tyVarsOfType, tyVarsOfTypes, tyVarsOfPred,
tyVarsOfTheta, Kind, PredType(..), KindVar,
ThetaType, isUnliftedTypeKind, unliftedTypeKind,
tyVarsOfType, tyVarsOfTypes, tyVarsOfPred,
tyVarsOfTheta, Kind, PredType(..), KindVar,
ThetaType, isUnliftedTypeKind, unliftedTypeKind,