ghc/packages/Cabal is not a valid repository name
On 2016-11-05 I was able to follow the newcomer build instructions https://ghc.haskell.org/trac/ghc/wiki/Newcomers and built ghc on Windows with MSYS2 x64. I am now repeating those steps and see that doing a clean recursive clone of ghc fails for the Cabal submodule and many others ...
$ git clone --recursive git://github.com/ghc/ghc
Cloning into '/d/Dev/Src/ghc/libraries/Cabal'...
fatal: remote error:
ghc/packages/Cabal is not a valid repository name
I tried the exact same recursive clone on OSX and it completed without error.