Hi Dimitrios,
Done: http://hackage.haskell.org/trac/ghc/ticket/4981
BTW although I said in my original email that this happened on GHC 6.12
as well as GHC 7, it looks like that's not the case for the cutdown
example. I'm fairly sure that it happened with my original code; let me
know if it's
You are doing something very delicate here, akin to overlapping instances.
You have an instance
instance PatchInspect (PrimOf p)) = Conflict p
and a function
clever :: (Conflict (OnPrim p), ..) = ...
So if a constraint (Conflict blah) arises in the RHS of clever,
Hi Simon,
You talk about the timing of application of the instance declaration
instancePatchInspect (PrimOf p)) = Conflict p
but the constraint is actually defined in the class declaration, and I
don't have any instance declarations for Conflict p itself.
classPatchInspect (PrimOf p)) =
Hi Ganesh, you are right Simon's answer is not correct.
The cause of your problem is I believe quite involved -- I think I know what's
going on (Simon: it seems to be
an overlap problem indeed but between a different instance and given arising
from a superclass when trying to
solve a 'silent
