What will the output of program №39 show

What will be the output when the following program is run?

import (
        "fmt"
        "sync"
        )

func main () {
    var wg sync.WaitGroup
    m := make(map[int]int)

    for i := 0 ; i < 10; i++{
        wg.Add(1)
        go func(key int) {
            defer wg.Done()
            m[key] = key * key
        }(i)
    }
    wg.Wait()
            
    for key, val := range m{
        fmt.Printf("Key: %d, Value: %d\n", key, val)
    }
}