[GHC] #13388: Caret diagnostics interact badly with hsc2hs

[GHC]

#13388: Caret diagnostics interact badly with hsc2hs
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Rufflewind):

 WIP differentials:

 - https://phabricator.haskell.org/D3313 (ghc)
 - https://phabricator.haskell.org/D3314 (hsc2hs)

 Note: the new pragma will be just `{-# COLUMN 12345 #-}`, because it’s
 simpler for both ghc and hsc2hs.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13388#comment:3>
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