Unsafe variable capture in loop

gistfile1.txt

func Test(t *testing.T) {
	a := map[int]int{
	}
	var b sync.Map
	for i := 0; i < 2000; i++ {
		a[i] = i
	}

	var wg sync.WaitGroup
	wg.Add(2000)
	for k, v := range a{
		go func() {
			b.Store(k, v)
			wg.Done()
		}()
	}
	wg.Wait()
	for i := 0; i < 2000; i++ {
		v, ok := b.Load(i)
		if !ok {
			t.Fatal("missing")
		}
		if v != i {
			t.Fatal("wrong val")
		}
	}
}