Mon Jul  9 11:22:09 PDT 2007  Ian Lynagh <[EMAIL PROTECTED]>
  * Tweak the undecidable-instance-checking logic
  Just looking at Opt_GlasgowExts is not sufficient to see if we need
  to do an instance undecidability check. Rather than try to enumerate
  all the extensions that may require us to do the check we now always
  do it.

    M ./compiler/typecheck/TcMType.lhs -4 +4

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