[GHC] #9453: The example for GHC Generics is kinda broken

[GHC]

#9453: The example for GHC Generics is kinda broken
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              Reporter:  Feuerbach   |            Owner:  dreixel
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:              |          Version:  7.8.2
  Documentation                      |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by dreixel):

 Yes; certainly if the way the compiler nests sums in the automatic
 derivation of `Generic` instances changes, or if the user is giving their
 own instances, there is no guarantee that the serialisation outcome is the
 same. I could perhaps add a note to the example in the manual to highlight
 the fact that it doesn't try to work across different versions of the
 compiler. Updating the example to deal with different nestings would be
 overkill, I think.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9453#comment:2>
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