go typeswitch2 源码
golang typeswitch2 代码
文件路径：/test/typeswitch2.go
// errorcheck
// 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.
// Verify that various erroneous type switches are caught by the compiler.
// Does not compile.
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 { // ERROR "duplicate"
w()
r()
}:
return "wr"
}
return ""
}
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