go/test/typeswitch3.go

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// errchk $G -e $D/$F.go
// Copyright 2011 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
type I interface {
M()
}
func main(){
var x I
switch x.(type) {
case string: // ERROR "impossible"
println("FAIL")
}
}