golang b 代码
文件路径：/test/fixedbugs/bug478.dir/b.go
// Copyright 2013 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 p2
import "./a"
type S2 struct {
p1.S1
}
func (s S2) f() {}