if !testableListenArgs(tt.network1, JoinHostPort(tt.address1, "0"), "") {
			t.Logf("skipping %s test", tt.network1+" "+tt.address1)
			continue
		}

		if !supportsIPv4map() && differentWildcardAddr(tt.address1, tt.address2) {
			tt.xerr = nil
		}
		var firstErr, secondErr error
		for i := 0; i < 5; i++ {
			lns, err := newDualStackListener()
			if err != nil {
				t.Fatal(err)
			}