[GHC] #14078: -ddump-json doesn't work well with GHCi

[GHC]

#14078: -ddump-json doesn't work well with GHCi
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        Reporter:  dramforever       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  GHCi              |              Version:  8.2.1
      Resolution:                    |             Keywords:  JSON
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 mpickering, do you think we will be able to fix this by 8.6?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14078#comment:9>
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