1 // errchk $G -e $D/$F.go
3 // Copyright 2009 The Go Authors. All rights reserved.
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file.
11 func whatis(x interface{}) string {
15 case int: // ERROR "duplicate"
19 case io.Reader: // ERROR "duplicate"
21 case interface { r(); w() }:
23 case interface { w(); r() }: // ERROR "duplicate"