edison question

[Brian Huffman]

The Collection module just defines the OrdColl class, without giving any 
instances for it. To use the Collection module directly, you would have to 
define one or more instances yourself, something like this:

data Bag a = ...
instance OrdColl Bag a where
  insert a c = ...
  minElem c = ...
  ...

But I assume that you don't want to implement your own collection datatype or 
write your own insert, minElem, etc. Luckily, Edison comes with a few 
pre-defined instances of OrdColl, each in a separate module. You just have to 
import the one you want.

Replace the line
> import qualified Collection as C
with
> import qualified SkewHeap as C
(or LazyPairingHeap, or SplayHeap, or UnbalancedSet) and it should work fine.

Hope this helps.
- Brian Huffman