patch applied (hugs98): report the top-level goal when hitting the cutoff (fixes #65)

20 Apr 2007

      Fri Apr 20 13:28:47 PDT 2007  Ross Paterson 
  * report the top-level goal when hitting the cutoff (fixes #65)

  Formerly cutoffExceeded() reported the current goal, which was not
  necessarily part of the problematic cycle.  For example, given

      class C a where
          f :: a -> a

      instance (Eq a, C a) => C a

      test = f True

  it reported that it could not prove Eq Bool, even though this is
  provable in one step.

    M ./src/preds.c -6 +22