patch applied (ghc): Be more relaxed about reporting ambiguous class methods

[Simon Peyton Jones]

Wed Jan  3 08:07:03 PST 2007  simonpj at microsoft.com
  * Be more relaxed about reporting ambiguous class methods
  	(MERGE to STABLE branch, pls)
  
  This patch makes us a bit more relaxed about ambiguous 
  class method types.  See tc223 for an example.
  
  Reported by Yitzchak Gale
  

    M ./compiler/typecheck/TcTyClsDecls.lhs -2 +8