[GHC] #11432: Cannot export operator newtype

[GHC]

#11432: Cannot export operator newtype
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        Reporter:  phadej            |                Owner:  skvadrik
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  8.0.1-rc1
      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:D1888
       Wiki Page:                    |
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Comment (by simonpj):

 I'm fine with a better error message.

 It would be Much Better if the "note" part only came out if there
 ''actually was'' a type constructor `(%%)` in scope. And that should be
 easy to check.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11432#comment:27>
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