[GHC] #9674: Foldable doesn't have any laws

[GHC]

#9674: Foldable doesn't have any laws
-------------------------------------+-------------------------------------
       Reporter:  dfeuer             |                   Owner:  ekmett
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Core Libraries     |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  Documentation bug
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 The documentation for `Foldable` doesn't list any laws. I don't know
 exactly what its laws may be, but there are, at least, several implicit in
 the default method definitions.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9674>
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