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Clean build from source yields:
[ 7 of 19] Compiling Paths_cabal_dev ( dist\build\autogen\Paths_cabal_dev.hs, d
[ 8 of 19] Compiling Distribution.Dev.CabalInstall ( src\Distribution\Dev\CabalI
nstall.hs, dist\build\cabal-dev\cabal-dev-tmp\Distribution\Dev\CabalInstall.o )
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... ghc.exe: internal error: R_X86_64_PC32: Hig
h bits are set in 7fa7fcb95a0 for WaitForSingleObject
(GHC version 7.6.1 for x86_64_unknown_mingw32)
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
cabal.exe: Error: some packages failed to install:
cabal-dev-0.9.1 failed during the building phase. The exception was:
I'll investigate this with the GHC team, but thought I ought to report it here too.