[GHC] #14082: -ddump-json does not escape output properly

[GHC]

#14082: -ddump-json does not escape output properly
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        Reporter:  dramforever       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
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 dramforever):

 Looks like
 https://phabricator.haskell.org/diffusion/GHC/browse/master/compiler/utils/Json.hs;884bd21a917f607b5a44e038e06f78d0b765ea63$42

 A typo causes `"` to be escaped to `"`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14082#comment:1>
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