`patch-tool unpack` failure (cd: too many arguments)
To reproduce, run the following commands:
$ ./head-hackage/scripts/patch-tool unpack hxt-regex-xmlschema
~/Documents/Hacking/Haskell/staging/packages ~/Documents/Hacking/Haskell/staging
Unpacking to hxt-regex-xmlschema-9.2.0.3/
Initialized empty Git repository in /home/rgscott/Documents/Hacking/Haskell/staging/packages/hxt-regex-xmlschema-9.2.0.3/.git/
~/Documents/Hacking/Haskell/staging
Added packages/hxt-regex-xmlschema-9.2.0.3 to cabal.project.local
$ ./head-hackage/scripts/patch-tool unpack hxt
~/Documents/Hacking/Haskell/staging/packages ~/Documents/Hacking/Haskell/staging
Unpacking to hxt-9.3.1.18/
./head-hackage/scripts/patch-tool: line 91: cd: too many arguments