mirror of
https://github.com/golang/go
synced 2024-11-21 16:14:42 -07:00
1912632019
bonus: type switch now detects multiple uses of identical interface types. bonus: interface types are now order-independent, following the spec. R=ken2 CC=golang-dev https://golang.org/cl/194053
29 lines
562 B
Go
29 lines
562 B
Go
// errchk $G -e $D/$F.go
|
|
|
|
// Copyright 2009 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 main
|
|
|
|
import "io"
|
|
|
|
func whatis(x interface{}) string {
|
|
switch x.(type) {
|
|
case int:
|
|
return "int"
|
|
case int: // ERROR "duplicate"
|
|
return "int8"
|
|
case io.Reader:
|
|
return "Reader1"
|
|
case io.Reader: // ERROR "duplicate"
|
|
return "Reader2"
|
|
case interface { r(); w() }:
|
|
return "rw"
|
|
case interface { w(); r() }: // ERROR "duplicate"
|
|
return "wr"
|
|
|
|
}
|
|
return ""
|
|
}
|