Fix compile error for Windows build
commitc7852b5a6758a12b1a2395f93927924be7ded3bc
authorHerbert Valerio Riedel <hvr@gnu.org>
Thu, 22 Sep 2016 07:45:59 +0000 (22 09:45 +0200)
committerHerbert Valerio Riedel <hvr@gnu.org>
Thu, 22 Sep 2016 07:47:36 +0000 (22 09:47 +0200)
treeb224981dbd90db5b817746d09dc7d04c0f63992d
parentf87738df20fa6531ef1680b79ca777d58dbc2fe4
Fix compile error for Windows build

Turns out that `RankNTypes` is only needed for the windows-conditional
code parts in `CreatePipe`
Cabal/Distribution/Compat/CreatePipe.hs