[Hat] ... and another?

1 Nov 2005

      I think there's a bug in unique naming for instances of (originally)  
derived classes.

Putting this in one file:

data Result = Result {
                   resultModule :: TagString,
                   resultName :: TagString,
                   resultType :: TagString,
                   resultInfo :: [Reason],
                   resultScore :: Score
                   }
                   deriving Show

and this in another:

data ClassTable = ClassTable (Map.Map String [TypeMatch])
                   deriving Show

generates code that has the function a25v28v25v31showsPrec in both  
modules, and thus causes this error:

Hat/MatchClass.hs:30:12:
     Ambiguous occurrence `a25v28v25v31showsPrec'
     It could refer to either `Hat.MatchClass.a25v28v25v31showsPrec',  
defined at Hat/MatchClass.hs:368:0
                           or `Hat.Result.a25v28v25v31showsPrec',  
imported from Hat.Result at Hat/MatchClass.hs:11:0-16

Bob

[Hat] ... and another?

Thomas Davie