{-# LANGUAGE Safe #-}-- |---- Module : Control.Monad.Fail-- Copyright : (C) 2015 David Luposchainsky,-- (C) 2015 Herbert Valerio Riedel-- License : BSD-style (see the file LICENSE)---- Maintainer : libraries@haskell.org-- Stability : provisional-- Portability : portable---- Transitional module providing the 'MonadFail' class and primitive-- instances.---- This module can be imported for defining forward compatible-- 'MonadFail' instances:---- @-- import qualified Control.Monad.Fail as Fail---- instance Monad Foo where-- (>>=) = {- ...bind impl... -}---- -- Provide legacy 'fail' implementation for when-- -- new-style MonadFail desugaring is not enabled.-- fail = Fail.fail---- instance Fail.MonadFail Foo where-- fail = {- ...fail implementation... -}-- @---- See <https://gitlab.haskell.org/haskell/prime/-/wikis/libraries/proposals/monad-fail>-- for more details.---- @since 4.9.0.0--moduleControl.Monad.Fail (MonadFail (fail ))whereimportGHC.Internal.Control.Monad.Fail