// run | |
// 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() | |
} |