patch applied (ghc-6.10/ghc): Improve error message in deriving (fix Trac #2851)

[Ian Lynagh]

Tue Dec 30 08:59:06 PST 2008  simonpj at microsoft.com
  * Improve error message in deriving (fix Trac #2851)

    M ./compiler/typecheck/TcDeriv.lhs -1 +3

View patch online:
http://darcs.haskell.org/ghc-6.10/ghc/_darcs/patches/20081230165906-1287e-c4408c509e0da57216c885cd0d2c8d507a0136d8.gz