[GHC] #14754: -O1 changes result at runtime

[GHC]

#14754: -O1 changes result at runtime
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        Reporter:  Bodigrim          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.4.1-alpha1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"606edbfba14b025ce85a02e5ed7c03e8a097d692/ghc"
 606edbfb/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="606edbfba14b025ce85a02e5ed7c03e8a097d692"
 testsuite: Add testcase for #14754
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14754#comment:7>
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