Re: [xmonad] darcs patch: Correct warnings with ghc-6.12 (and 1 more)

Adam Vogt writes:

- compatibility with base-4 or 3 (base-2 untested) by using extensible-exceptions. This adds an additional dependency for users of ghc<6.10)

From memory, extensible-exceptions needs >=GHC-6.8, so using it means

there's no more base-2 compatability. On the other hand, do we really need to keep support for