[Haskell-cafe] Factoring into type classes

[Luke Palmer]

On Mon, Jan 19, 2009 at 3:58 AM, Patai Gergely <patai_gergely at fastmail.fm>wrote:

> However, there are other type classes that are too general to assign
> such concrete uses to. For instance, if a data structure can have more
> than one meaningful (and useful) Functor or Monoid instance,


As a side curiosity, I would love to see an example of any data structure
which has more than one Functor instance.  Especially those which have more
than one useful functor instance.

Luke
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