Can't find interface-file declaration for type constructor or class integer-gmp:GHC.Integer.Type.Integer
simonpj at microsoft.com
Fri Aug 19 00:39:42 CEST 2011
It's hard to know what Ian had in mind, but I'm sure he'll tell us when he gets back from holiday.
Meanwhile, yes, it is hard to reconcile
* The wish to have multiple implementations of Integer
* The wired-in knowledge that GHC has
* The desire to have optimising rewrite rules in client libraries
I suggested one approach in the ticket earlier today; there might be others. It might be good to figure out a good design before going much further into implementation.
| -----Original Message-----
| From: Johan Tibell [mailto:johan.tibell at gmail.com]
| Sent: 18 August 2011 18:14
| To: Simon Peyton-Jones
| Cc: glasgow-haskell-users
| Subject: Re: Can't find interface-file declaration for type constructor or class
| On Thu, Aug 18, 2011 at 7:07 PM, Simon Peyton-Jones
| <simonpj at microsoft.com> 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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