On 5 June 2012 17:52, Andres Löh <and...@well-typed.com> wrote: > Hi Bas. > > I haven't thought about this for long, but ... > >> data ProxyWrapper constraint = >> forall a. constraint a => ProxyWrapper (Proxy a) > > I'm assuming adding Typable a in ProxyWrapper is not an option for you?
No, I would rather keep that type as unconstrained as possible. > So then what about: > > class (c1 a, c2 a) => Ext c1 c2 a > instance (c1 a, c2 a) => Ext c1 c2 a > > typeOfInnerProxy :: ProxyWrapper (Ext Typeable constraint) -> TypeRep > typeOfInnerProxy (ProxyWrapper p) = typeOfArg p > > This will certainly require all sorts of undecidable instances :) But > does it work for you? It works. Thanks a lot! Cheers, Bas _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
