golang b 代码
文件路径：/test/fixedbugs/issue43551.dir/b.go
// Copyright 2021 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 b
import "./a"
type S a.S
type Key a.Key
func (s S) A() Key {
return Key(a.S(s).A())
}