ghc 7.6.1 libs
Merge branch 'experimental/hack-nix' into refs/top-bases/experimental/updates

* experimental/hack-nix:
  ghc 7.6.1 libs
Merge commit 'refs/top-bases/experimental/updates' into experimental/updates

* commit 'refs/top-bases/experimental/updates':
  ghc 7.6.1 libs