update for base 4.7

[joeyh]

Could this please be updated to work with base 4.7?

I tried to adjust the requirements manually, but it indeed fails to build with this version:

Control/Exception/Lifted.hs:271:8:
Cannot instantiate unification variable α1' with a type involving foralls: (forall a. m a -> m a) -> m b Perhaps you want -XImpredicativeTypes In the expression: liftBaseOp E.mask ∘ liftRestore In an equation formask': mask = liftBaseOp E.mask ∘ liftRestore

The reason I'm using such a new ghc is a bit of a long story. The recently available ghc-android cross compiler uses ghc from git, perhaps with good reason, since it does patch parts of it.

[basvandijk]

I currently don't have base-4.7 installed so I can't yet fix and test it. Would you consider making a pull request for this?

[kazu-yamamoto]

I have a patch and can send a pull request. Do you think "base < 5" is reasonable? This is related to: basvandijk/monad-control#14

The ImpredicativeTypes extension is also necessary in addition to losing the upper limit of base.

[basvandijk]

Sure send me a pull request. base < 5 is fine.

[kazu-yamamoto]

I sent a pull request. #15