[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):

 Replying to [comment:10 cipher1024]:
 > Is there is a way to disregard the libraries' upper bound on base? Could
 that work?

 With `cabal`, that's possible with the `--allow-newer` flag. `stack-1.4.0`
 and later apparently
 [https://github.com/commercialhaskell/stack/issues/922 also has] an
 `allow-newer` config option, although I've never tried that.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13547#comment:11>
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