[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
           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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 If I create a haskell file called, for example, Main.hs which does not
 compile and run `ghc -ddump-json Main.hs` I will get a json formatted
 output after the error messages. This is a list of the errors, as
 expected. However if I run `runghc -ddump-json Main.hs` I get an empty
 list at the end `[]`

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