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

[Roman Cheplyaka]

* Henning Thielemann <lemming at henning-thielemann.de> [2013-06-06 12:14:10+0200]
> 
> 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.

... which would give the wrong association with exceptions (in the
Control.Exception sense). I don't see how this is an improvement.

Roman