Friends

Just a heads-up.  Pedro is working on implementing "Generic Defaults", as 
described in his Haskell Symposium 2010 paper 
www.dreixel.net/research/pdf/gdmh_nocolor.pdf

It will replace (and improve on) the "Derivable type classes" stuff in GHC at 
the moment, which was originally presented in a paper of that title that Ralf 
and I wrote in the 2000 Haskell workshop 
http://research.microsoft.com/en-us/um/people/simonpj/papers/derive.htm.

The "Derivable type class" extension is barely used, I believe, and isn't even 
documented in the manual.  So I propose to switch from one to the other, rather 
than to try to support both.  This change will happen in GHC 7.2 or 7.4, 
depending on when Pedro is done.

Please yell if you are a secret user of derivable type classes, so this change 
would discombobulate you.

Simon


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