-- | Versions of 'mutable_' and 'constant_' restricted to 'Exp' 'String', used to avoid
--   ambiguous type errors.
mutableStr_, constantStr_ :: Exp String -> Action (Exp String)
mutableStr_ = mutable_
mutableStr_, constantStr_ :: Exp String -> Action (Exp String)
mutableStr_ = mutable_
mutableStr_ = mutable_