[GHC] #12974: Solution to regular expression is no longer valid

[GHC]

#12974: Solution to regular expression is no longer valid
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        Reporter:  pjljvdlaar    |                Owner:
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Compiler      |              Version:  8.0.1
      Resolution:                |             Keywords:  regex
Operating System:  Windows       |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Comment (by bgamari):

 Hmm, I am unable to reproduce this on x86_64 Linux with GHC 8.0.1,
 `HUnit-1.5.0.0`, and `regex-posix-0.95.2`. Trying Windows next.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12974#comment:6>
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