[GHC] #12206: No exposed API to get full text of ErrMsg

[GHC]

#12206: No exposed API to get full text of ErrMsg
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        Reporter:  bit               |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHC API           |              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):
       Wiki Page:                    |
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Comment (by mpickering):

 Seems like a sensible suggestion. Could you perhaps submit a patch
 exposing it?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12206#comment:1>
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