Panic when building HEAD with BuildFlavour=quickest: "Can't use Integer in integer-*"

$ uname -op
x86_64 GNU/Linux

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.8.3

$ git log --oneline | head -1
fa75309 Update .mailmap

$ make
===--- building phase 0
make -r --no-print-directory -f ghc.mk phase=0 phase_0_builds
make[1]: Nothing to be done for `phase_0_builds'.
===--- building phase 1
make -r --no-print-directory -f ghc.mk phase=1 phase_1_builds
make[1]: Nothing to be done for `phase_1_builds'.
===--- building final phase
make -r --no-print-directory -f ghc.mk phase=final all
"inplace/bin/ghc-stage1" -hisuf hi -osuf  o -hcsuf hc -static  -H64m -O0 -fasm    -this-package-key integ_2MbWUstH60IEgCAexOk3v3 -hide-all-packages -i -ilibraries/integer-gmp2/src/ -ilibraries/integer-gmp2/dist-install/build -ilibraries/integer-gmp2/dist-install/build/autogen -Ilibraries/integer-gmp2/dist-install/build -Ilibraries/integer-gmp2/dist-install/build/autogen -Ilibraries/integer-gmp2/include    -optP-include -optPlibraries/integer-gmp2/dist-install/build/autogen/cabal_macros.h -package-key ghcpr_BE58KUgBe9ELCsPXiJ1Q2r -this-package-key integer-gmp -Wall -XHaskell2010 -O0 -fasm  -no-user-package-db -rtsopts      -odir libraries/integer-gmp2/dist-install/build -hidir libraries/integer-gmp2/dist-install/build -stubdir libraries/integer-gmp2/dist-install/build  -dynamic-too -c libraries/integer-gmp2/src//GHC/Integer/Type.hs -o libraries/integer-gmp2/dist-install/build/GHC/Integer/Type.o -dyno libraries/integer-gmp2/dist-install/build/GHC/Integer/Type.dyn_o
ghc-stage1: panic! (the 'impossible' happened)
  (GHC version 7.9.20141114 for x86_64-unknown-linux):
	Can't use Integer in integer-*

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

make[1]: *** [libraries/integer-gmp2/dist-install/build/GHC/Integer/Type.o] Error 1
make: *** [all] Error 2

Trac metadata

Trac field	Value
Version	7.8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	hvr
Operating system
Architecture