On Fri, Jan 10, 2003 at 12:50:14PM +0000, Stephen Eldridge wrote:
> Using version Nov 2002 in Windows XP I find that import Trex gives me
>
> Reading file "c:\progra~1\hugs98\lib\hugs\Trex.hs":
> ERROR "c:\progra~1\hugs98\lib\hugs\Trex.hs" - Illegal export of a lone data
> cons
> tructor "EmptyRec"
>
> This can be cured by removing the export of EmptyRec from Trex.hs
> but I don't think this should be necessary.
Exporting a constructor wasn't legal Haskell, and now Hugs implements
this restriction. I think the problem is that EmptyRec isn't a real
constructor (it has type Rec EmptyRow, not Rec r), and the fix should
be to add
emptyRec = EmptyRec
and export that instead of EmptyRec (and maybe change the Show instance
to match).
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