On Tue, Feb 18, 2003 at 11:51:06AM -0800, Iavor S. Diatchki wrote:
> the recent updates of the module system seem to have broken Trex.
> the problem is that Hugs.Trex tries to export "EmptyRec" which is a data
> constructor and so cannot be named explicitly in an export list.
> (interestingly enough the Prelude does the same, but no error seems to
> occur)
There's an ugly hack for the prelude, so (:) and EmptyRec can escape.
(Another consequence: if you import Prelude(), you don't even have (:)).
> a quick fix that seems to work is to change the Hugs.Trex module as follows:
>
> module Hugs.Trex( module Hugs.Trex ) where
>
> import Hugs.Prelude as Hugs.Trex -- ( Rec, EmptyRec, EmptyRow )
>
> of course now Trex exports the whole of the Prelude, but hey it is a
> quick fix :-)
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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