Excerpts from Edward Z. Yang's message of Fri Jan 01 13:27:49 -0500 2010: > I upgraded, but now both Control.Monad.Failure and Control.Monad.Error > claim to be exporting "Error". Is this correct, and if so, which one > should I hide? Sorry my bad; I should have been importing Control.Monad.Failure.MTL. The error has gone away. Cheers, Edwadrd