[GHC] #15175: ghc: panic! (the 'impossible' happened)

[GHC]

#15175: ghc: panic! (the 'impossible' happened)
-------------------------------------+-------------------------------------
           Reporter:  MADjestic      |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.0.2
           Keywords:                 |  Operating System:  Linux
       Architecture:  x86_64         |   Type of failure:  Compile-time
  (amd64)                            |  crash or panic
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Hey guys,

 When following the installation instructions for [https://github.com
 /ivanperez-keera/SpaceInvaders/ SpaceInvaders], I am getting the following
 error:


 {{{
 [13 of 14] Compiling ObjectBehavior   ( src/ObjectBehavior.hs, dist/dist-
 sandbox-5c221c1a/build/spaceInvaders/spaceInvaders-tmp/ObjectBehavior.o )

 src/ObjectBehavior.hs:20:1: warning: [-Wunused-imports]
     The qualified import of ‘System.Random’ is redundant
       except perhaps to import instances from ‘System.Random’
     To import instances alone, use: import System.Random()

 src/ObjectBehavior.hs:23:1: warning: [-Wunused-imports]
     The import of ‘FRP.Yampa.Integration’ is redundant
       except perhaps to import instances from ‘FRP.Yampa.Integration’
     To import instances alone, use: import FRP.Yampa.Integration()

 src/ObjectBehavior.hs:24:1: warning: [-Wunused-imports]
     The import of ‘FRP.Yampa.Utilities’ is redundant
       except perhaps to import instances from ‘FRP.Yampa.Utilities’
     To import instances alone, use: import FRP.Yampa.Utilities()

 src/ObjectBehavior.hs:256:1: warning: [-Wmissing-signatures]
     Top-level binding with no type signature:
       gravity :: Vector2 Velocity

 src/ObjectBehavior.hs:263:1: warning: [-Wmissing-signatures]
     Top-level binding with no type signature:
       limit :: Ord a => a -> a -> a -> a

 src/ObjectBehavior.hs:265:1: warning: [-Wmissing-signatures]
     Top-level binding with no type signature:
       symLimit :: (Num t, Ord t) => t -> t -> t
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.0.2 for x86_64-unknown-linux):
         StgCmmEnv: variable not found
   $dNum_aoyU
   local binds for:
   $s$fVectorSpaceVector2a_$s$fVectorSpaceVector2a_$cnorm
   $s$fVectorSpaceVector2a_$s$fVectorSpaceVector2a_$cp1VectorSpace
   $sintegralAux_rsVn
   integralAux_rsVo
   lvl_rsVp
   lvl1_rsVq
   lvl2_rsVr
   lvl3_rsVs
   $sintegralAux1_rsVt
   integralAux1_rsVu
   $sintegralAux2_rsVv
   integralAux2_rsVw
   lvl4_rsVx
   lvl5_rsVy
   lvl6_rsVz
   lvl7_rsVA
   lvl8_rsVB
   lvl9_rsVC
   lvl10_rsVD
   lvl11_rsVE
   lvl13_rsVM
   lvl14_rsVN
   lvl15_rsVO
   lvl16_rsVP
   lvl17_rsVQ
   lvl18_rsVR
   lvl19_rsVS
   lvl20_rsVT
   lvl21_rsVU
   lvl22_rsVV
   lvl23_rsVW
   lvl24_rsVX
   lvl25_rsVY
   dt_rsVZ
   dt1_rsW0
   sf_rsW1
   dt2_rsW2
   lvl26_rsW3
   lvl27_rsW4
   lvl28_rsW5
   lvl29_rsW6
   lvl30_rsW7
   lvl31_rsW8
   lvl32_rsW9
   lvl33_rsWa
   lvl34_rsWb
   lvl35_rsWc
   lvl36_rsWd
   lvl37_rsWe
   lvl38_rsWf
   lvl39_rsWg
   lvl40_rsWh
   lvl41_rsWi
   lvl42_rsWj
   lvl43_rsWk
   lvl44_rsWl
   lvl45_rsWm
   lvl46_rsWn
   lvl47_rsWo
   lvl48_rsWp
   lvl49_rsWq
   lvl50_rsWr
   lvl51_rsWs
   lvl52_rsWt
   lvl53_rsWu
   lvl54_rsWv
   lvl55_rsWw
   lvl56_rsWx
   lvl57_rsWy
   lvl58_rsWz
   lvl59_rsWA
   lvl60_rsWB
   lvl61_rsWC
   lvl62_rsWD
   lvl63_rsWE
   lvl64_rsWF
   $sintegralAux3_rsWG
   integralAux5_rsWH
   ll_rsWI

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

 [https://github.com/ivanperez-
 keera/SpaceInvaders/issues/30#issuecomment-390638740 /original issue]

 {{{
 $ ghc -V
 The Glorious Glasgow Haskell Compilation System, version 8.0.2
  $ uname -a
 Linux nu 4.9.95-gentoo #1 SMP PREEMPT Wed May 9 22:32:30 CEST 2018 x86_64
 Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz GenuineIntel GNU/Linux
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15175>
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