649     def _check_arguments(self, fac, check):  argument
663             return fac(args)
690         def fac(args):  function
692         self._check_arguments(fac, self.stmt)
850         def fac(args):  function
852         self._check_arguments(fac, self.expr)
871     def _check_comprehension(self, fac):  argument
872         self.expr(fac([]), "comprehension with no generators")
875         self.expr(fac([g]), "must have Store context")
878         self.expr(fac([g]), "must have Load context")
882         self.expr(fac([g]), "None disallowed")
884         self.expr(fac([g]), "must have Load context")
886     def _simple_comp(self, fac):  argument
889         self.expr(fac(ast.Name("x", ast.Store()), [g]),
892             return fac(ast.Name("x", ast.Store()), gens)
984     def _sequence(self, fac):  argument
985         self.expr(fac([None], ast.Load()), "None disallowed")
986         self.expr(fac([ast.Name("x", ast.Store())], ast.Load()),