[GHC] #11414: Panic with -XStrict: StgCmmEnv: variable not found

[GHC]

#11414: Panic with -XStrict: StgCmmEnv: variable not found
-------------------------------------+-------------------------------------
           Reporter:  thomie         |             Owner:
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  7.11
           Keywords:  Strict         |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 {{{
 {-# LANGUAGE Strict #-}
 main = print $ let x = undefined in True
 }}}


 Using HEAD or GHC 8.0:
 {{{
 $ ghc-8.0.0.20160109 Test.hs
 [1 of 1] Compiling Main             ( Test.hs, Test.o )
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.0.0.20160109 for x86_64-unknown-linux):
         StgCmmEnv: variable not found
   $dIP_aDK
   local binds for:

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

 Using a devel2 build:
 {{{
 $ ./inplace/bin/ghc-stage2 Test.hs
 [1 of 1] Compiling Main             ( Test.hs, Test.o )
 WARNING: file compiler/simplCore/OccurAnal.hs, line 66
   Glomming in Main: [aDO :->]
 WARNING: file compiler/coreSyn/CoreSubst.hs, line 278
   CoreSubst.lookupIdSubst simpleOptExpr $dIP_aDO
   InScope [aDM :-> a_aDM]
 WARNING: file compiler/simplCore/OccurAnal.hs, line 66
   Glomming in Main: [aDO :-> Once]
 WARNING: file compiler/simplCore/SimplEnv.hs, line 530 $dIP_aDO
 WARNING: file compiler/simplCore/OccurAnal.hs, line 66
   Glomming in Main: [aDO :-> Once]
 WARNING: file compiler/simplCore/SimplEnv.hs, line 530 $dIP_aDO
 ghc-stage2: panic! (the 'impossible' happened)
   (GHC version 8.1.20160103 for x86_64-unknown-linux):
         ASSERT failed! file compiler/stgSyn/CoreToStg.hs line 1025
 $dIP_aDO

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

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11414>
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