if err != nil {
		t.Fatalf("Marshal(%v) got error %v", ip, err)
	}
	back := string(jsb)
	if back != orig {
		t.Errorf("Marshal(Unmarshal(%q)) got %q, want %q", orig, back, orig)
	}
}

func TestAddrFrom16(t *testing.T) {
	tests := []struct {
		name string
		in   [16]byte
		want Addr
	}{
		{
			name: "v6-raw",
			in:   [...]byte{15: 1},
			want: MkAddr(Mk128(0, 1), Z6noz),
		},
		{