Oh! I'd completely forgotten about this idea. Looking at Data.LinearMap in vector-space, I see a comment about exactly this ambiguity, as well as the start of a new module that wraps a data type around the linear map representation. I don't recall whether I got stuck or just distracted.
On Sat, Apr 17, 2010 at 3:46 AM, Roman Leshchinskiy <r...@cse.unsw.edu.au>wrote: > On 17/04/2010, at 11:00, Conal Elliott wrote: > > > I'm unsure now, but I think I tried making Basis a data type (not syn) > and ran into the problem I mentioned above. The Basis *synonyms* also have > HasTrie instances, which is crucially important. If we switch to > (injective) data types, then we lose the HasTrie instances. I'd be okay > with defining HasTrie instances (preferably via "deriving") for the > associated Basis data types, but I couldn't figure out how to. Maybe it's > not possible currently, or maybe I just didn't know how. > > Could you perhaps make (:-*) a proper type rather than a synonym? That > would help with the ambiguity. > > Roman > > >
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