[GHC] #9031: ghc panic: RegAlloc.Liveness.computeLivenss

[GHC]

#9031: ghc panic: RegAlloc.Liveness.computeLivenss
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        Reporter:  jwlato              |            Owner:
            Type:  bug                 |           Status:  new
        Priority:  normal              |        Milestone:
       Component:  Compiler            |          Version:  7.8.2
      Resolution:                      |         Keywords:
Operating System:  Unknown/Multiple    |     Architecture:
 Type of failure:  Compile-time crash  |  Unknown/Multiple
       Test Case:                      |       Difficulty:  Unknown
        Blocking:                      |       Blocked By:
                                       |  Related Tickets:
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Comment (by jwlato):

 Paul, thanks very much.  I've created a self-contained test case based on
 your code (I believe it's the same issue I'm having).  When I try to
 compile the attached files with

 {{{
 ghc -O2 Top.hs
 }}}

 I get the same error.

 One interesting thing is that this error seems to require that
 `pawnAdvanceSquares` is called in multiple locations, even though in the
 generated core it only appears once.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9031#comment:4>
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