[GHC] #15660: source file modify race leads to inconsistent error message

[GHC]

#15660: source file modify race leads to inconsistent error message
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        Reporter:  joeyhess          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Indeed this is a known limitation of GHC's implementation of caret
 diagnostics (which indeed re-reads the source file to extract the span
 indicated in the error message).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15660#comment:1>
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