ghc: panic! (the 'impossible' happened) -- Please report this as a GHC bug
The compiler asked me to report this.
/Users/megacz/proj/icfp09/ghc/ghc/stage1-inplace/ghc -DGHCI_TABLES_NEXT_TO_CODE -DSTAGE=2 -package-name ghc-6.11.20081208 -hide-all-packages -no-user-package-conf -i -idist-stage2/build -inativeGen -ibasicTypes -icmm -icodeGen -icoreSyn -icprAnalysis -ideSugar -ighci -ihsSyn -iiface -imain -iparser -iprelude -iprofiling -irename -isimplCore -isimplStg -ispecialise -istgSyn -istranal -itypecheck -itypes -iutils -ivectorise -idist-stage2/build/autogen -Idist-stage2/build/autogen -Idist-stage2/build -I../libffi/build/include -Istage2plus -I../libraries/base/cbits -I../libraries/base/include -I. -Iparser -Iutils -optP-DGHCI -optP-include -optPdist-stage2/build/autogen/cabal_macros.h -odir dist-stage2/build -hidir dist-stage2/build -stubdir dist-stage2/build -package Cabal-1.5.5 -package array-0.2.0.0 -package base-4.0.0.0 -package bytestring-0.9.1.4 -package containers-0.2.0.0 -package directory-1.0.0.2 -package filepath-1.1.0.1 -package haskell98-1.0.1.0 -package hpc-0.5.0.2 -package old-time-1.0.0.1 -package process-1.0.1.1 -package template-haskell-2.3.0.0 -package unix-2.3.1.0 -O -Wall -fno-warn-name-shadowing -fno-warn-orphans -XCPP -XMagicHash -XUnboxedTuples -XPatternGuards -XForeignFunctionInterface -XEmptyDataDecls -XTypeSynonymInstances -XMultiParamTypeClasses -XFlexibleInstances -XRank2Types -XScopedTypeVariables -XDeriveDataTypeable -prof -hisuf p_hi -hcsuf p_hc -osuf p_o -idist-stage2/build -H32m -O -Rghc-timing -O2 -c nativeGen/MachRegs.lhs -o dist-stage2/build/MachRegs.p_o -ohi dist-stage2/build/MachRegs.p_hi
ghc: panic! (the 'impossible' happened)
(GHC version 6.11.20081208 for i386-apple-darwin):
CoreToStg.myCollectArgs
(__scc {trivColorable ghc-6.11.20081208:MachRegs !}
ghc-6.11.20081208:MachRegs.isSqueesed{v r2zH} [gid] 0 0)
eta_s2Gv{v} [lid]
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
<<ghc: 127672968 bytes, 16 GCs, 5231957/10604544 avg/max bytes residency (3 samples), 38M in use, 0.00 INIT (0.00 elapsed), 0.36 MUT (0.46 elapsed), 0.16 GC (0.19 elapsed) :ghc>>
make[4]: *** [dist-stage2/build/MachRegs.p_o] Error 1
make[3]: *** [all] Error 1
make[2]: *** [build.stage.2] Error 2
make[1]: *** [stage2] Error 2
make: *** [bootstrap2] Error 2
This is using git HEAD, commit 2aba6f168b7bcb4f8c7c8e8f7cdc340a0ccb56e7