[Haskell-beginners] question about shared data types

[Brent Yorgey]

On Mon, Apr 29, 2013 at 11:28:03AM +0100, Ian Knopke wrote:
>
> I've been including newtype Foo in a Common.hs module that is
> included in both, as I would in C or C++. This sort of thing can easily get
> more complicated as the program grows however.

That is exactly what I would do, and is a common practice.  For
example, you will often see a module named something like
'Foo.Bar.Types' which contains declarations of common types which are
used in many other modules.

I am not sure what you mean when you say that this can get complicated
as the program grows.  I have some fairly large packages using this
technique and in practice I have not seen much complication.  Can you
give an example of the sort of complication you mean?

-Brent