for review: test cases for typeclasses

[Fergus Henderson]

That looks good.

It would probably be a good idea to also move the typeclass tests
that I added in tests/hard_coded into the typeclass subdirectory.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>   |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>   |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3         |     -- the last words of T. S. Garp.