[GHC] #11106: Optimizer changes behavior in 7.10.3

[GHC]

#11106: Optimizer changes behavior in 7.10.3
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           Reporter:  dsf            |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The repository at https://github.com/ddssff/ghcbug contains a four module
 package that works when compiled with -O2, but fails when compiled with
 -O2.  The cabal file builds working and failing executable.

 One of the modules has OPTIONS_GHC -O0 in the header, so the bug is
 related to mixing modules with different optimization levels.  Other than
 that, I have little idea what is going on.

 The bug was present in 7.10,2, and is definitely still present in
 7.10.3-rc1.  I doubt it has been fixed since then.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11106>
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