// so it is suspicious if this test passes and others don't
	m[0] = 0
	ch := make(chan bool, 1)
	go func() {
		for range m {
		}
		ch <- true
	}()
	for range m {
	}
	<-ch
}

func TestRaceMapLen(t *testing.T) {
	m := make(map[string]bool)
	ch := make(chan bool, 1)
	go func() {
		_ = len(m)
		ch <- true
	}()
	m[""] = true
	<-ch
}

func TestRaceMapDelete(t *testing.T) {