On Mon, Jan 13, 2014 at 6:47 AM, João Cristóvão <jmacristovao@gmail.com> wrote:
Then I see it defined in GHC Head - but unfortunatelly not all packages support it yet. And I can only guess that installing base 4.7 on top of GHC 7.6.3 would certainly result in Cabal Hell.

It's not even possible, since base includes the runtime.

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