darcs patch: Add equating p x y = p x == p y

[Duncan Coutts]

Wed Oct 11 15:14:32 BST 2006  Duncan Coutts <duncan.coutts at worc.ox.ac.uk>
  * Add equating p x y = p x == p y
  Just as useful as the 'comparing' function from Data.Ord,
  but for cases where we check equality rather than ordering.
  Use like: groupBy (equating fst)
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