golang a 代码
文件路径：/test/fixedbugs/bug492.dir/a.go
// Copyright 2014 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 a
type s struct {
s string
}
func F1(s s) {
}
func F2() s {
return s{""}
}