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

[GHC]

#10158: Panic compiling singletons: StgCmmEnv: variable not found
-------------------------------------+-------------------------------------
              Reporter:  trommler    |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:  7.11
  (CodeGen)                          |  Operating System:  Unknown/Multiple
              Keywords:              |   Type of failure:  None/Unknown
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
 `cabal install singletons` panics like this with HEAD:

 {{{
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.11.20150313 for x86_64-unknown-linux):
         StgCmmEnv: variable not found
   cobox_a1Job
   local binds for:
   sConst
   sAsTypeOf
   sId
   %:++
   sMap
   sFoldr
   %$
   %$!
   $WLet_1627796109GoSym3KindInference
   $WLet_1627796109GoSym2KindInference
   $WLet_1627796109GoSym1KindInference
   $WLet_1627796109GoSym0KindInference
   $WSeqSym1KindInference
   $WSeqSym0KindInference
   $WFlipSym2KindInference
   $WFlipSym1KindInference
   $WFlipSym0KindInference
   $WConstSym1KindInference
   $WConstSym0KindInference
   $WAsTypeOfSym1KindInference
   $WAsTypeOfSym0KindInference
   $WIdSym0KindInference
   $W:++$###
   $W:++$$###
   $WMapSym0KindInference
   $WMapSym1KindInference
   $WFoldrSym2KindInference
   $WFoldrSym1KindInference
   $WFoldrSym0KindInference
   $WLambda_1627796009Sym3KindInference
   $WLambda_1627796009Sym2KindInference
   $WLambda_1627796009Sym1KindInference
   $WLambda_1627796009Sym0KindInference
   $W:.$$$###
   $W:.$$###
   $W:.$###
   %$1
   sAsTypeOf1
   sConst1
   sFlip1
   sId1
   sSeq1
   a_r1JEg
   sF_s1JFN
   sG_s1JFO
   sA_1627796004_s1JFP

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10158>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler