[GHC] #10688: Incorrect program produced, different result with equivalent code

[GHC]

#10688: Incorrect program produced, different result with equivalent code
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        Reporter:  Ideophage         |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by ezyang):

 Is it possible to upload a (presumably large) program which reproduces the
 problem?  Even some code snippets would help; what's the stopping
 condition of `takeWhile`?  Can you reproduce with `-O0`? Can you try with
 7.10.2 or even the latest master version of GHC? Some description of what
 the code does would also be useful.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10688#comment:1>
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