isMutablePinned (MUArray _ _ (MUArrayMBA mb))  = BLK.isMutablePinned mb
isMutablePinned (MUArray _ _ (MUArrayMBA mb))  = BLK.isMutablePinned mb
isMutablePinned (MUArray _ _ (MUArrayMBA mb))  = BLK.isMutablePinned mb