Deriviable type classes

[Simon Peyton-Jones]

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:jpm at 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 <simonpj at microsoft.com<mailto:simonpj at 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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