Enum with only a single member

[Chris Angelico]

On Tue, Jan 10, 2017 at 7:33 PM, Paul Rubin <no.email at nospam.invalid> wrote:
>> That is, a singleton enum?
>
> Why stop there?  You can make empty ones too.  (Zerotons?)

Sure you *can*, but I can't think of any time they'd be useful. Can
you give an example?

ChrisA