[GHC] #9618: Undocument ImpredicativeTypes

[GHC]

#9618: Undocument ImpredicativeTypes
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       Reporter:  dfeuer             |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Documentation      |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Easy (less than 1  |         Type of failure:
  hour)                              |  None/Unknown
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
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 I understand that Simon Peyton Jones intends to make `ImpredicativeTypes`
 work some day, but it doesn't work now. I think the thing to do for now is
 to remove it from the user manual. It can be put back in later if it's
 ever fixed.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9618>
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