[Haskell-beginners] how do typeclasses work again?

[Dimitri DeFigueiredo]

I would like to make a general comment that is likely not useful to the
specific question asked (which I think has already been nicely answered
by others).
But I would like to point out this video of an excellent lecture on
typeclasses given by Simon Peyton-Jones a few years ago.

https://channel9.msdn.com/posts/MDCC-TechTalk-Classes-Jim-but-not-as-we-know-them

Cheers,

Dimitri

-- 
2E45 D376 A744 C671 5100 A261 210B 8461 0FB0 CA1F