[ANNOUNCE] GHC 8.4.2-rc1 now available

[Wolfgang Jeltsch]

Am Sonntag, den 01.04.2018, 17:05 -0400 schrieb Ben Gamari:
> Hello everyone,
> 
> The GHC team is proud to announce the first release candidate of
> 8.4.2.
> the source distribution, binary distributions, and documentation are
> available at
> 
>     https://downloads.haskell.org/~ghc/8.4.2-rc1

Hi!

Unfortunately, this release candidate cannot build
order-maintenance-0.2.1.0. When trying, the “impossible” happens.
The full output is below. I’ll file a bug report soon.

Any chance that this will be fixed before the 8.4.2 release?

All the best,
Wolfgang

Full output:

> [ 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