[go-nuts] confusion about the implemention of tryStore func in sync.map

[avtimp]

I am learning sync.map recently, but the implemention of tryStore func 
<https://go.googlesource.com/go/+/go1.11/src/sync/map.go#169> makes me 
confused, 
why not use the code below instead



func (e *entry) tryStore(i *interface{}) bool {
   for {
       p = atomic.LoadPointer(&e.p)
       if p == expunged {
           return false
       }
       if atomic.CompareAndSwapPointer(&e.p, p, unsafe.Pointer(i)) {
           return true
       }
   }
}


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