[GHC] #10822: GHC inconsistently handles \\?\ for long paths on Windows

[GHC]

#10822: GHC inconsistently handles \\?\ for long paths on Windows
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        Reporter:  snoyberg      |                Owner:
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Compiler      |              Version:  7.10.2
      Resolution:                |             Keywords:
Operating System:  Windows       |         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 ezyang):

 But then the best thing to do is figure out exactly what the state of
 short path support is in the toolchain, lobby projects to fix this, and
 eventually get this fixed. upstream is broken is not an excuse to throw
 ones hands up and give up.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10822#comment:3>
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