(p)
const_list : '[' const_list_seq ']'
const_list : '[' const_list_seq ']'
const_list : [ const_list_seq ]
def p_const_list(p):
    '''const_list : '[' const_list_seq ']' '''
    p[0] = p[2]
def p_const_list ( p ) : p [ 0 ] = p [ 2 ]