[GHC] #13190: Add a flag to dump compiler output as JSON

[GHC]

#13190: Add a flag to dump compiler output as JSON
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        Reporter:  mpickering        |                Owner:  mpickering
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3010
       Wiki Page:                    |
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Comment (by mpickering):

 Replying to [comment:1 simonpj]:
 > I don't know much about JSON but the basic idea seems good.
 >
 > This is just for error messages, right, not for (say `-ddump-simpl`)?

 All compiler output will be formatted as structured JSON. The consumer can
 filter out logging messages from -ddump-simpl output from warnings as they
 desire. This information is tracked in the `Severity` argument.

 >
 > Perhaps `-ddump-X` isn't the right connotation.  Maybe `-djson-errors`?

 That much is up for discussion. It is named this way as it hooks into the
 same machinery which controls `-ddump-to-file` and related flags.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13190#comment:2>
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