The Go Memory Model
文章结尾有这么一段代码，理解的不是很透彻，谁给讲解一下，谢谢！
There are subtler variants on this theme, such as this program.
type T struct {
msg string
}
var g *T
func setup() {
t := new(T)
t.msg = "hello, world"
g = t
}
func main() {
go setup()
for g == nil {
}
print(g.msg)
}
Even if main observes g != nil and exits its loop, there is no guarantee that it will observe the initialized value for g.msg.
In all these examples, the solution is the same: use explicit synchronization.
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