golang bug256 代码
文件路径：/test/fixedbugs/bug256.go
/ errorcheck
/ Copyright 2010 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
package main
type T U / bogus "invalid recursive type T" from 6g
type U int
const x T = 123
type V V / ERROR "invalid recursive type"