It was reported in #haskell that xmonad-contrib does not compile with
ghc HEAD. We tracked it down to (>>>) no longer being exported from
Control.Arrow. It is now a member of the Category superclass and defined
in Control.Category but it is no longer exported from Control.Arrow.
It seems that any code that does not define its own arrow instances would
still be able to work unchanged if (>>>) and (<<<) were just to be
re-exported from Control.Arrow.
So here's a completely untested patch to do that.
Duncan
Fri Apr 25 10:11:13 BST 2008 Duncan Coutts