@staticmethod
def p_compu_vtab_optional_list(p):
    """compu_vtab_optional_list : compu_vtab_optional
                                    | compu_vtab_optional compu_vtab_optional_list"""
    try:
        p[0] = [p[1]] + p[2]
    except IndexError:
        p[0] = [p[1]]
