[GHC] #13433: Segmentation faults in profiled way

[GHC]

#13433: Segmentation faults in profiled way
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by dfeuer):

 Replying to [comment:7 bgamari]:
 > Quick update: At this point I have determined that the issue is the fix
 to #5654. Ultimately it seems like we are ending up with a `stg_sel_5_upd`
 being invoked on a `SimplEnv.FloatFlag`, which is not a single-constructor
 record (it is a enumeration). Naturally, things go terribly awry. Still
 trying to work out exactly how we get into this situation.

 How can the fix to a closed ticket fix a new one? I'm missing something.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13433#comment:8>
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