[GHC] #15005: GHC fails with “StgCmmEnv: variable not found” when trying to compile order-maintenance-0.2.1.0

[GHC]

#15005: GHC fails with “StgCmmEnv: variable not found” when trying to compile
order-maintenance-0.2.1.0
-------------------------------------+-------------------------------------
           Reporter:  jeltsch        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.4.3
          Component:  Compiler       |           Version:  8.4.2-rc1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash or panic
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 When trying to build `order-maintenance-0.2.1.0`, GHC 8.4.2-rc1 panics.
 Its output is as follows:

 {{{
 [ 1 of 21] Compiling Data.Order.Algorithm.Raw (
 src/library/Data/Order/Algorithm/Raw.hs,
 /home/wolfgang/Entwicklung/Haskell/order-maintenance-0.2.1.0/dist-
 newstyle/build/x86_64-linux/ghc-8.4.1.20180329/order-
 maintenance-0.2.1.0/build/Data/Order/Algorithm/Raw.o )
 [ 2 of 21] Compiling Data.Order.Algorithm.Raw.DietzSleatorAmortizedLog (
 src/library/Data/Order/Algorithm/Raw/DietzSleatorAmortizedLog.hs,
 /home/wolfgang/Entwicklung/Haskell/order-maintenance-0.2.1.0/dist-
 newstyle/build/x86_64-linux/ghc-8.4.1.20180329/order-
 maintenance-0.2.1.0/build/Data/Order/Algorithm/Raw/DietzSleatorAmortizedLog.o
 )
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.4.1.20180329 for x86_64-unknown-linux):
         StgCmmEnv: variable not found
   x_a46z
   local binds for:
   $tc'Label
   $tcLabel
   $tc'Cell
   $tcCell
   $trModule
   $tc'Cell1
   $tc'Cell2
   $tc'Cell3
   $trModule1
   $trModule2
   $trModule3
   $trModule4
   $tc'Label1
   $tc'Label2
   $tc'Label3
   $tcCell1
   $tcCell2
   $tcLabel1
   $tcLabel2
   lvl_r4UD
   lvl1_r4UE
   lvl2_r4UF
   lvl3_r4UG
   lvl4_r4UH
   lvl5_r4UI
   lvl6_r4UJ
   lvl7_r4UK
   lvl8_r4UL
   lvl9_r4UM
   lvl10_r4UN
   lvl11_r4UO
   lvl12_r4UP
   lvl13_r4UQ
   lvl14_r4UR
   lvl15_r4US
   lvl16_r4UT
   lvl17_r4UU
   $krep_r4UV
   $krep1_r4UW
   $krep2_r4UX
   lvl18_r4UY
   $krep3_r4UZ
   $krep4_r4V0
   $krep5_r4V1
   $krep6_r4V2
   $krep7_r4V3
   $krep8_r4V4
   $krep9_r4V5
   lvl19_r4V6
   lvl20_r4V7
   lvl21_r4V8
   lvl22_r4V9
   lvl23_r4Va
   lvl24_r4Vb
   lvl25_r4Vc
   ww_s4W2
   lwild_s4W3
   lwild1_s4W4
   noOfLabels_s4W5
   noOfLabels1_s4W6
   labelMask_s4W7
   $wnewAfterCell_s4Wa
   ww1_s4Wb
   ipv1_s4Wf
   wild_s4Wg
   ds_s4Wh
   ds2_s4Wi
   ww2_s4Wk
   ww3_s4Wl
   ww4_s4Wn
   ww5_s4Wo
   wild1_s4Wq
   smallGap_s4Wr
   wild2_s4Ws
   Call stack:
       CallStack (from HasCallStack):
         callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in
 ghc:Outputable
         pprPanic, called at compiler/codeGen/StgCmmEnv.hs:149:9 in
 ghc:StgCmmEnv

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

 The same problem exists with GHC 8.4.1.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15005>
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