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// $G $D/$F.go && $L $F.$A && ./$A.out

// 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

type I interface{}

func foo1(i int) int     { return i }
func foo2(i int32) int32 { return i }
func main() {
        var i I
        i = 1
        var v1 = i.(int)
        if foo1(v1) != 1 {
                panic(1)
        }
        var v2 = int32(i.(int))
        if foo2(v2) != 1 {
                panic(2)
        }
        
        shouldPanic(p1)
}

func p1() {
        var i I
        i = 1
        var v3 = i.(int32) // This type conversion should fail at runtime.
        if foo2(v3) != 1 {
                panic(3)
        }
}

func shouldPanic(f func()) {
        defer func() {
                if recover() == nil {
                        panic("function should panic")
                }
        }()
        f()
}