Can't find interface-file declaration for type constructor or class integer-gmp:GHC.Integer.Type.Integer

Johan Tibell johan.tibell at
Thu Aug 18 19:13:45 CEST 2011

On Thu, Aug 18, 2011 at 7:07 PM, Simon Peyton-Jones
<simonpj at> wrote:
> | I shouldn't have to modify PrelNames since I kept GHC.Integer.Type,
> | no? Or does PrelNames have to contain the name of the module that
> | originally defined the type?
> Yes, exactly!

This causes some trouble though, as the module named in PrelNames must
exist in both in integer-gmp and integer-simple i.e. it must be some
generic name like GHC.Integer.Type rather than a name containing e.g.
GMP. I could keep the data type definition where it is
(GHC.Integer.Type) but then I would have a hard time exporting it from
e.g. GHC.Integer.GMP.Internals without undoing Ian's patch which
removed the slightly odd GHC.Integer -> GHC.Integer.GMP.Internals ->
GHC.Integer.Type module dependency in integer-gmp.

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