The "Derivable type class" extension is barely used, I believe, and isn't even documented in the manual.
Isn't it this?: http://www.haskell.org/ghc/docs/latest/html/users_guide/generic-classes.html Oh yes, silly me. It is documented! Simon From: José Pedro Magalhães [mailto:j...@cs.uu.nl] Sent: 09 February 2011 12:20 To: Simon Peyton-Jones Cc: GHC users Subject: Re: Deriviable type classes Hi, 2011/2/9 Simon Peyton-Jones <simo...@microsoft.com<mailto:simo...@microsoft.com>> 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<http://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. Isn't it this?: http://www.haskell.org/ghc/docs/latest/html/users_guide/generic-classes.html But anyway, I can't remember seeing any use of it. Cheers, Pedro
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