What should be the preferred way of declaring completely abstract
types, without any meaningful representation known anywhere, for use
as a tag only (of the Ptr type from some new Foreign library)?
1. data CFile = CFile
GHC -Wall warns that I don't use the data constructor anywhere.
Right, this is what I indend to do, I don't want to export it,
and I don't want this warning.
2. newtype CFile = CFile CFile
This is really without any non-bottom representation. The problem
is as the previous one.
3. data CFile
This syntax is not currently supported. Would it make sense?
4. ???
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