golang a 代码
文件路径：/test/fixedbugs/issue30659.dir/a.go
// Copyright 2019 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 I interface {
I2
}
type I2 interface {
M()
}
type S struct{}
func (*S) M() {}
func New() I {
return &S{}
}