patch applied (ghc): Improve error messages for ' deriving' clauses

Simon Peyton Jones simonpj at microsoft.com
Fri Mar 16 10:30:40 EDT 2007 

Fri Mar 16 07:28:24 PDT 2007  simonpj at microsoft.com
  * Improve error messages for 'deriving' clauses
  
  This patch improves the misleading error message reported in Trac #1133.
  
  Please merge the patch to the 6.6.1 branch.
  

    M ./compiler/typecheck/TcDeriv.lhs -21 +19

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