Superclass defaults

[Simon Peyton-Jones]

| > If someone felt able to act as moderator for the discussion, willing
| > to summarise conclusions, open questions, and so on, on the wiki
| > page, that would be enormously helpful.
| 
| I'm up for that role, if that's appropriate.

I'll take you up on that, thank you!  I've added some "SLPJ note" notes to http://hackage.haskell.org/trac/ghc/wiki/DefaultSuperclassInstances which could perhaps do with clarifying.

Simon

PS: to avoid spam, maybe now we have advertised this thread, we should restrict it to ghc-users?  The *current* library question about mappend etc can stay on libraries.