golang bug291 代码
文件路径：/test/fixedbugs/bug291.go
/ run
/ Copyright 2010 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.
/ https://golang.org/issue/915
package main
type T struct {
x int
}
var t = &T{42}
var i interface{} = t
var tt, ok = i.(*T)
func main() {
if tt == nil || tt.x != 42 {
println("BUG")
}
}