[GHC] #13584: ghci parse error on operator info

[GHC]

#13584: ghci parse error on operator info
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        Reporter:  akegalj           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  GHCi              |              Version:  8.0.2
      Resolution:                    |             Keywords:  parse, info,
                                     |  operator
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Incorrect result  |  (amd64)
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 It is indeed strange that these parse differently. I would argue that we
 should reject `(+ )`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13584#comment:2>
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