[GHC] #15457: (~) and (!) are parsed inconsistently in types (plus documentation warts)

[GHC]

#15457: (~) and (!) are parsed inconsistently in types (plus documentation warts)
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        Reporter:  RyanGlScott       |                Owner:  int-index
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.4.3
  (Parser)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5180
       Wiki Page:                    |
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Changes (by int-index):

 * differential:   => Phab:D5180


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15457#comment:4>
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