[GHC] #10158: Panic compiling singletons: StgCmmEnv: variable not found

[GHC]

#10158: Panic compiling singletons: StgCmmEnv: variable not found
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        Reporter:  trommler          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.11
  (CodeGen)                          |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  Compile-time      |               Test Case:
  crash                              |                Blocking:
      Blocked By:                    |  Differential Revisions:
 Related Tickets:                    |
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Comment (by simonpj):

 I do not.  I just looked at the -ddump-ds trace from compiling singletons,
 noted the missing binding of a coercion, and traced it back to the
 flattener.

 With enough thought I might be able to construct a test case (as might
 you), but there are so many other things to do too

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10158#comment:5>
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