[GHC] #10659: Regression concurrent/conc034 -O Core Lint errors : in result of Simplifier

[GHC]

#10659: Regression concurrent/conc034 -O Core Lint errors : in result of Simplifier
-------------------------------------+-------------------------------------
        Reporter:  thomie            |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.10.2-rc1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
                                     |  concurrent/conc034,
                                     |  libraries/array/tests/array001
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * milestone:  7.10.2 => 7.12.1


Comment:

 We discussed this in the GHC call today. SPJ is working on a fix although
 isn't concerned that the issue found by Core lint jeopardizes real-world
 programs. Indeed the binary produced by compiling without `-dcore-lint`
 runs as expected.

 Marked on `ghc-7.10` as broken in
 dc771a80c2222e4843c71af09d78fef35fba9b06.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10659#comment:3>
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