[Haskell-cafe] Need an example of new type constructor with zero data constructors

[James Brown]

What's the purpose to allow data declarations with no constructors?

On Fri, Aug 12, 2016 at 11:08 AM, Sergey N. Yashin <yashin.sergey at gmail.com>
wrote:

> For zero data constructors you need to use only EmptyDataDecls
> <https://prime.haskell.org/wiki/EmptyDataDecls> extension.
>
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