[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 cipher1024):

 Good guess!

 As for trimming it down, I'm not sure how to do it. How do you normally
 proceed? Is there a better approach to commenting out functions until I
 find one that breaks the compiler?

 I'm going to try HEAD. If the fix exists, is there any chance it might get
 applied to ghc-8.0.1 and ghc-8.0.2?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13547#comment:6>
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