Hi,
I cannot build GHC head on Mac today:
"inplace/bin/ghc-stage1" -hisuf hi -osuf o -hcsuf hc -static -H32m -O
-package-name ghc-7.7.20130907 -hide-all-packages -i -icompiler/basicTypes
-icompiler/cmm -icompiler/codeGen -icompiler/coreSyn -icompiler/deSugar
-icompiler/ghci -icompiler/hsSyn -icompiler/iface -icompiler/llvmGen
-icompiler/main -icompiler/nativeGen -icompiler/parser -icompiler/prelude
-icompiler/profiling -icompiler/rename -icompiler/simplCore -icompiler/simplStg
-icompiler/specialise -icompiler/stgSyn -icompiler/stranal -icompiler/typecheck
-icompiler/types -icompiler/utils -icompiler/vectorise -icompiler/stage2/build
-icompiler/stage2/build/autogen -Icompiler/stage2/build
-Icompiler/stage2/build/autogen -Icompiler/. -Icompiler/parser -Icompiler/utils
-Icompiler/../rts/dist/build -Icompiler/stage2 -optP-DGHCI -optP-include
-optPcompiler/stage2/build/autogen/cabal_macros.h -package Cabal-1.18.0
-package array-0.4.0.2 -package base-4.7.0.0 -package bin-package-db-0.0.0.0
-package bytestring-0.10.3.0 -pack
age containers-0.5.3.1 -package directory-1.2.0.1 -package filepath-1.3.0.2
-package hoopl-3.10.0.0 -package hpc-0.6.0.1 -package process-1.2.0.0 -package
template-haskell-2.9.0.0 -package time-1.4.1 -package transformers-0.3.0.0
-package unix-2.7.0.0 -Wall -fno-warn-name-shadowing -XHaskell98 -XCPP
-XMagicHash -XUnboxedTuples -XPatternGuards -XForeignFunctionInterface
-XEmptyDataDecls -XTypeSynonymInstances -XMultiParamTypeClasses
-XFlexibleInstances -XRankNTypes -XScopedTypeVariables -XDeriveDataTypeable
-XBangPatterns -XNondecreasingIndentation -DGHCI_TABLES_NEXT_TO_CODE -DSTAGE=2
-O2 -no-user-package-db -rtsopts -odir compiler/stage2/build -hidir
compiler/stage2/build -stubdir compiler/stage2/build -dynamic-too -c
compiler/deSugar/Coverage.lhs -o compiler/stage2/build/Coverage.o -dyno
compiler/stage2/build/Coverage.dyn_o
ghc-stage1: panic! (the 'impossible' happened)
(GHC version 7.7.20130907 for i386-apple-darwin):
expectJust block_order
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
make[1]: *** [compiler/stage2/build/Parser.o] Error 1
make[1]: *** Deleting file `compiler/stage2/build/Parser.o'
make[1]: *** Waiting for unfinished jobs....
make: *** [all] Error 2
--Kazu
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