21 Sep
2012
21 Sep
'12
11:38 a.m.
On Fri, Sep 21, 2012 at 12:30 AM, David Fox
I was wondering about this:
-- My goal with this instance was to make it work just enough to do what -- I want when used with the HStringTemplate library. instance Data UUID where toConstr uu = mkConstr uuidType (show uu) [] (error "fixity") gunfold _ _ = error "gunfold" dataTypeOf _ = uuidType
Is there any reason not to just say "deriving Data" in the type declaration?
I didn't want my 'Data' instance to leak the details of the constructor. Also I don't know much about how 'Data' works. I think a similar conversation is going on about the Data declarations in the 'containers' library. Antoine