[go-nuts] Why the following code is data race free ?

[Ting Yuan]

I wrote a simple function and hope it has a race alarm under the `-race` 
flag:

package main

import (
        "fmt"
        "time"
)

func main() {
        a := 1
        go func() {
                fmt.Println(a) // If I remove this instruction, the 
detector will report a data race
                a = 3
        }()
        fmt.Println(a)
        time.Sleep(time.Second)
}

I am confused, why there is no data race in the above program. I'm using 
go1.17.2 linux/amd64

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