[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 skvadrik):

 So the breakage was **not** caused by the change of grammar (`(-.->)(..)`
 is parsed as neither `qcon` nor `oqtycon`, it is parsed as `qvar`). It was
 caused by removal of `setRdrNameSpace` call.

 D1888 breaks one test (`make test TEST=mod89`): we get error instead of
 warning and the message is different (perhaps less informative).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11432#comment:24>
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