@staticmethod
def p_a2ml_enumerator_list(p):
    """a2ml_enumerator_list : a2ml_enumerator
                                | a2ml_enumerator COMMA a2ml_enumerator_list"""
    try:
        p[0] = [p[1]] + p[3]
    except IndexError:
        p[0] = [p[1]]
