[GHC] #14159: Decomposition of path sometimes fails

[GHC]

#14159: Decomposition of path sometimes fails
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           Reporter:  Phyx-             |             Owner:  (none)
               Type:  bug               |            Status:  new
           Priority:  normal            |         Milestone:  8.2.2
          Component:  Compiler          |           Version:  8.2.1
           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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 The path decomposition sometimes fails in SysTools with an
 `INVALID_FUNCTION` error. The fall back method never executes because of
 the unexpected raised exception.

 This makes the Windows tarballs a but unpredictable when placed in random
 folders and starting up from random cwd.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14159>
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