def METHOD_NAME(*args, **kws):
    # Fold keyword args
    try:
        bound = pysig.bind(*args, **kws)
    except TypeError as e:
        msg = "In '%s': %s" % (instance_class, e)
        e.args = (msg,)
        raise
    assert not bound.kwargs
    return types.BaseTuple.from_types(bound.args, instance_class)