code: def parse_arguments(arguments):
      
      arguments = f"def f{arguments}: ..."
      try:
          result = ast3.parse(arguments, '<arguments>', 'exec')
      except SyntaxError:
          raise ValueError(f"invalid arguments: {arguments!r}") from None
  
      assert isinstance(result, ast3.Module)
      assert len(result.body) == 1
      assert isinstance(result.body[0], ast3.FunctionDef)
      args = result.body[0].args
      copy_type_comments_to_annotations(args)
      return args
docs: parse_arguments('(a, b, *, c=False, **d)') -> ast3.arguments
  
      Parse a string with function arguments into an AST node.