Nougat 7.1  |  7.1.1_r28
Golang程序  |  18行  |  247 B 

// 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 a

type S interface{
	F() T
}

type T struct {
	S
}

type U struct {
	error
}