[GHC] #13547: ghc: panic! StgCmmEnv: variable not found

[GHC]

#13547: ghc: panic! StgCmmEnv: variable not found
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        Reporter:  cipher1024        |                Owner:  (none)
            Type:  bug               |               Status:  infoneeded
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
  (CodeGen)                          |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  10158             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Another useful check would be to build this with GHC HEAD. It's possible
 that this bug has already been fixed there (e.g., this might be a
 duplicate of #12944, but it's hard to tell).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13547#comment:5>
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