deprecating Error class (Was: Proposal: add handleError to mtl)

[Henning Thielemann]

On Wed, 5 Jun 2013, Ross Paterson wrote:

> On the subject of ErrorT, I wonder if it's time to deprecate the Error class.

Since I think ErrorT gives the wrong association with the 'error' 
function, I would prefer to give up the Control.Monad.Trans.Error module 
entirely and start a new module Control.Monad.Trans.Exception. You could 
deprecate Error class and ErrorT type and stay in the version range 0.3.*.