14 Sep
2014
14 Sep
'14
4:13 p.m.
On Sun, Sep 14, 2014 at 12:40:56PM -0700, Karl Voelker wrote:
I just discovered that Control.Monad.Error [1] has recently become deprecated in favor of Control.Monad.Except [2], and I am curious about what motivated the change. Can anyone explain?
I discovered it recently too, in a search for a package similar to ``either`` but which didn't rely on template-haskell. Not a maintainer, so just a wild guess: maybe it is because the new module hasn't got the ``class Error`` (and people wanted to get rid of it) and general less hairiness? The commits/changelog don't contain other info: https://github.com/ekmett/mtl/commits/master/Control/Monad/Except.hs