[GHC] #10538: Simpilifier produces empty case in core, segfaults at runtime.

[GHC]

#10538: Simpilifier produces empty case in core, segfaults at runtime.
-------------------------------------+-------------------------------------
        Reporter:  sopvop            |                   Owner:  bgamari
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.2-rc1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime crash     |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * owner:   => bgamari
 * failure:  None/Unknown => Runtime crash
 * priority:  normal => high
 * milestone:   => 7.10.2


Comment:

 Oh dear. This does look like quite a bad regression. Indeed I can
 reproduce it here. I'll dig in a bit tonight.

 I'm going to milestone this for 7.10.2 as it's a crash in pure code which
 worked in 7.8.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10538#comment:1>
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