mkClass, classTyVars, classArity,
classKey, className, classSelIds, classTyCon, classMethods,
classBigSig, classExtraBigSig, classTvsFds, classSCTheta
mkClass, classTyVars, classArity,
classKey, className, classSelIds, classTyCon, classMethods,
classBigSig, classExtraBigSig, classTvsFds, classSCTheta