| // 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" |
