go issue6977 源码
golang issue6977 代码
文件路径：/test/fixedbugs/issue6977.go
// errorcheck
// 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 p
import "io"
// Alan's initial report.
type I interface { f(); String() string }
type J interface { g(); String() string }
type IJ1 = interface { I; J }
type IJ2 = interface { f(); g(); String() string }
var _ = (*IJ1)(nil) == (*IJ2)(nil) // static assert that IJ1 and IJ2 are identical types
// The canonical example.
type ReadWriteCloser interface { io.ReadCloser; io.WriteCloser }
// Some more cases.
type M interface { m() }
type M32 interface { m() int32 }
type M64 interface { m() int64 }
type U1 interface { m() }
type U2 interface { m(); M }
type U3 interface { M; m() }
type U4 interface { M; M; M }
type U5 interface { U1; U2; U3; U4 }
type U6 interface { m(); m() } // ERROR "duplicate method .*m"
type U7 interface { M32; m() } // ERROR "duplicate method .*m"
type U8 interface { m(); M32 } // ERROR "duplicate method .*m"
type U9 interface { M32; M64 } // ERROR "duplicate method .*m"
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