def def_infix_op(parser, operator_token_label, prec, assoc, not_in_tree=
    False, precond_fun=None, precond_priority=0, construct_label=None,
    val_type=None, arg_types=None, eval_fun=None, ast_data=None):
    """This just calls the more general method `def_multi_infix_op`."""
    return parser.def_infix_multi_op([operator_token_label], prec, assoc,
        not_in_tree=not_in_tree, precond_fun=precond_fun, precond_priority=
        precond_priority, construct_label=construct_label, val_type=
        val_type, arg_types=arg_types, eval_fun=eval_fun, ast_data=ast_data)
