golang bug474 代码
文件路径：/test/fixedbugs/bug474.go
/ run
/ Copyright 2013 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.
/ Bug in method values: escape analysis was off.
package main
import "sync"
var called = false
type T struct {
once sync.Once
}
func (t *T) M() {
called = true
}
func main() {
var t T
t.once.Do(t.M)
if !called {
panic("not called")
}
}