Class.hs

{- |
Module      :  Control.Monad.Error.Class
Copyright   :  (c) Michael Weber <michael.weber@post.rwth-aachen.de> 2001,
               (c) Jeff Newbern 2003-2006,
               (c) Andriy Palamarchuk 2006
License     :  BSD-style (see the file LICENSE)

Maintainer  :  ross@soi.city.ac.uk
Stability   :  experimental
Portability :  non-portable (multi-parameter type classes)

[Computation type:] Computations which may fail or throw exceptions.

[Binding strategy:] Failure records information about the cause\/location
of the failure. Failure values bypass the bound function,
other values are used as inputs to the bound function.

[Useful for:] Building computations from sequences of functions that may fail
or using exception handling to structure error handling.

[Zero and plus:] Zero is represented by an empty error and the plus operation
executes its second argument if the first fails.

[Example type:] @'Either' 'String' a@

The Error monad (also called the Exception monad).
-}

{-
  Rendered by Michael Weber <mailto:michael.weber@post.rwth-aachen.de>,
  inspired by the Haskell Monad Template Library from
    Andy Gill (<http://web.cecs.pdx.edu/~andy/>)
-}
module Control.Monad.Error.Class (
    Error(..),
    MonadError(..),
  ) where

import "mtl" Control.Monad.Error.Class