[GHC] #9455: Data.Data documentation has a broken link

[GHC]

#9455: Data.Data documentation has a broken link
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              Reporter:  ryantm      |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  low         |        Milestone:
             Component:              |          Version:  7.8.2
  libraries/base                     |         Keywords:  documentation
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Easy (less than 1
  Unknown/Multiple                   |  hour)
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by hvr):

 I guess we should simply link to http://research.microsoft.com/en-
 us/um/people/simonpj/papers/hmap/ instead, which I assume will be more
 stable?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9455#comment:1>
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