// net.Listener().Addr().String when the listen address was ":n", even
// if the machine has halfway configured IPv6 such that it can bind on
// "::" not connect back to that same address.
func TestDialListenerAddr(t *testing.T) {
	if !testableNetwork("tcp4") {
		t.Skipf("skipping: can't listen on tcp4")
	}

	// The original issue report was for listening on just ":0" on a system that