[GHC] #9446: Segfault when using unsafe vector operations

[GHC]

#9446: Segfault when using unsafe vector operations
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       Reporter:  snoyberg        |                   Owner:
           Type:  bug             |                  Status:  new
       Priority:  normal          |               Milestone:
      Component:  Compiler        |                 Version:  7.8.3
       Keywords:                  |        Operating System:  Linux
   Architecture:  x86_64 (amd64)  |         Type of failure:  Runtime crash
     Difficulty:  Unknown         |               Test Case:
     Blocked By:                  |                Blocking:
Related Tickets:                  |  Differential Revisions:
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 I was working on some benchmarks and I ran into this issue. It's actually
 very difficult to reproduce; changing the attached file in different ways
 makes the bug go away quite quickly. But with the attached file, I
 regularly get a `internal error: evacuate: strange closure type 0`
 message, though on more complicated versions of the code I was working on,
 the integer would change for each run.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9446>
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