[GHC] #13695: Highly nested UNPACKed data causes panic

[GHC]

#13695: Highly nested UNPACKed data causes panic
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        Reporter:  ryanreich     |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  high          |            Milestone:  8.2.1
       Component:  Compiler      |              Version:  8.2.1-rc2
      Resolution:                |             Keywords:
Operating System:  Linux         |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:  #3990         |  Differential Rev(s):
       Wiki Page:                |
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Comment (by ryanreich):

 Okay, I did another test and found that changing the 4 to a 5 in
 BigWord.hs causes the panic again.  I don't know what number will "work"
 for you, but try increasing it until it does panic.  Weirdly, switching
 between 8.2.1 and HEAD causes that to work, but changing it to 6 breaks it
 again.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13695#comment:6>
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