[GHC] #16167: -ddump-json output empty with runghc

[GHC]

#16167: -ddump-json output empty with runghc
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        Reporter:  shmish111         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:  x86_64
 Type of failure:  Incorrect         |  (amd64)
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by shmish111):

 Interesting, with 8.6.3 there is no output at all, also `-ddump-json
 -ddump-to-file` does not produce a file (I guess that makes sense based on
 the fact that `-ddump-json` seems to not do anything.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16167#comment:2>
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