[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):

 Awesome that helps a lot, thank you!

 I departed from the plan just to see if `ghc-8.2.1` has  the bug still.
 Since most libraries don't support `base-4.10.0.0` it didn't get far
 enough to tell. Is there is a way to disregard the libraries' upper bound
 on base? Could that work? Otherwise, I'll just get back to minimizing the
 example.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13547#comment:10>
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