quickcheck doesn't build with ghc 7.6.1

[Thomas Dziedzic]

Hi,

I'm just writing this to inform you that ghc 7.6.1 no longer provides
extensible exceptions.

I believe it is now under Control.Exception.Base at least according to
http://haskell.1045720.n5.nabble.com/GHC-7173-Unnecessary-constraints-in-inferred-type-td5716458.html

Therefore quickcheck doesn't build with ghc 7.6.1

Thanks for your time!

- Thomas Dziedzic