Take a look to the Haskell Report: http://www.haskell.org/onlinereport/haskell2010/haskellch9.html#x16-1710009 -- Daniel Díaz -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.haskell.org/pipermail/haskell-cafe/attachments/20100906/a5f23e10/attachment.html