[GHC] #8743: The impossible happened : Prelude.(!!): index too large

[GHC]

#8743: The impossible happened : Prelude.(!!): index too large
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        Reporter:  erikd             |                   Owner:  nomeata
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:  7.8.1
       Component:  Compiler          |                 Version:  7.8.1-rc1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by nomeata):

 I indeed was confused. The test is already marked as `expect_broken`, and
 you are trying to fix the breakage... But it still is unrelated to the
 demand analyzer. I’ll continue the discussion in #10182, where it belongs.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8743#comment:14>
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