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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE ExistentialQuantification #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE GeneralizedNewtypeDeriving #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances #-}</span>
<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE MultiParamTypeClasses #-}</span>
<a name="line-7"></a><span class='hs-comment'>{-# LANGUAGE UndecidableInstances #-}</span>
<a name="line-8"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 702</span>
<a name="line-11"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-12"></a><span class='hs-cpp'>#endif</span>
<a name="line-13"></a>
<a name="line-14"></a><span class='hs-cpp'>#ifndef MIN_VERSION_transformers</span>
<a name="line-15"></a><span class='hs-cpp'>#define MIN_VERSION_transformers(x,y,z) 1</span>
<a name="line-16"></a><span class='hs-cpp'>#endif</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-cpp'>#ifndef MIN_VERSION_mtl</span>
<a name="line-19"></a><span class='hs-cpp'>#define MIN_VERSION_mtl(x,y,z) 1</span>
<a name="line-20"></a><span class='hs-cpp'>#endif</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-comment'>{-# OPTIONS_GHC -fno-warn-deprecations #-}</span>
<a name="line-23"></a><span class='hs-comment'>--------------------------------------------------------------------</span>
<a name="line-24"></a><span class='hs-comment'>-- |</span>
<a name="line-25"></a><span class='hs-comment'>-- Copyright : (C) Edward Kmett 2013-2015, (c) Google Inc. 2012</span>
<a name="line-26"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-27"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-28"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-29"></a><span class='hs-comment'>-- Portability : non-portable</span>
<a name="line-30"></a><span class='hs-comment'>--</span>
<a name="line-31"></a><span class='hs-comment'>-- This module supports monads that can throw extensible exceptions. The</span>
<a name="line-32"></a><span class='hs-comment'>-- exceptions are the very same from "Control.Exception", and the operations</span>
<a name="line-33"></a><span class='hs-comment'>-- offered very similar, but here they are not limited to 'IO'.</span>
<a name="line-34"></a><span class='hs-comment'>--</span>
<a name="line-35"></a><span class='hs-comment'>-- This code is in the style of both transformers and mtl, and is compatible</span>
<a name="line-36"></a><span class='hs-comment'>-- with them, though doesn't mimic the module structure or offer the complete</span>
<a name="line-37"></a><span class='hs-comment'>-- range of features in those packages.</span>
<a name="line-38"></a><span class='hs-comment'>--</span>
<a name="line-39"></a><span class='hs-comment'>-- This is very similar to 'ErrorT' and 'MonadError', but based on features of</span>
<a name="line-40"></a><span class='hs-comment'>-- "Control.Exception". In particular, it handles the complex case of</span>
<a name="line-41"></a><span class='hs-comment'>-- asynchronous exceptions by including 'mask' in the typeclass. Note that the</span>
<a name="line-42"></a><span class='hs-comment'>-- extensible extensions feature relies on the RankNTypes language extension.</span>
<a name="line-43"></a><span class='hs-comment'>--------------------------------------------------------------------</span>
<a name="line-44"></a>
<a name="line-45"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Catch</span> <span class='hs-layout'>(</span>
<a name="line-46"></a> <span class='hs-comment'>-- * Typeclass</span>
<a name="line-47"></a> <span class='hs-comment'>-- $mtl</span>
<a name="line-48"></a> <span class='hs-conid'>MonadThrow</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-49"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>MonadCatch</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-50"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>MonadMask</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-51"></a>
<a name="line-52"></a> <span class='hs-comment'>-- * Utilities</span>
<a name="line-53"></a> <span class='hs-comment'>-- $utilities</span>
<a name="line-54"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mask_</span>
<a name="line-55"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>uninterruptibleMask_</span>
<a name="line-56"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>catchAll</span>
<a name="line-57"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>catchIOError</span>
<a name="line-58"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>catchJust</span>
<a name="line-59"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>catchIf</span>
<a name="line-60"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Handler</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>catches</span>
<a name="line-61"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>handle</span>
<a name="line-62"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>handleAll</span>
<a name="line-63"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>handleIOError</span>
<a name="line-64"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>handleJust</span>
<a name="line-65"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>handleIf</span>
<a name="line-66"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>try</span>
<a name="line-67"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tryJust</span>
<a name="line-68"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>onException</span>
<a name="line-69"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>bracket</span>
<a name="line-70"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>bracket_</span>
<a name="line-71"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>finally</span>
<a name="line-72"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>bracketOnError</span>
<a name="line-73"></a> <span class='hs-comment'>-- * Re-exports from Control.Exception</span>
<a name="line-74"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Exception</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-75"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>SomeException</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-76"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-77"></a>
<a name="line-78"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exception</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>SomeException</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-79"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>ControlException</span>
<a name="line-80"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>STM</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>STM</span>
<a name="line-81"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>RWS</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>LazyRWS</span>
<a name="line-82"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>RWS</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>StrictRWS</span>
<a name="line-83"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>LazyS</span>
<a name="line-84"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>StrictS</span>
<a name="line-85"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Writer</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>LazyW</span>
<a name="line-86"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Writer</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>StrictW</span>
<a name="line-87"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>STM</span> <span class='hs-layout'>(</span><span class='hs-conid'>STM</span><span class='hs-layout'>)</span>
<a name="line-88"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span><span class='hs-conid'>ListT</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>runListT</span><span class='hs-layout'>)</span>
<a name="line-89"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>runMaybeT</span><span class='hs-layout'>)</span>
<a name="line-90"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Error</span><span class='hs-layout'>,</span> <span class='hs-varid'>runErrorT</span><span class='hs-layout'>)</span>
<a name="line-91"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Except</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>runExceptT</span><span class='hs-layout'>)</span>
<a name="line-92"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Cont</span> <span class='hs-layout'>(</span><span class='hs-conid'>ContT</span><span class='hs-layout'>)</span>
<a name="line-93"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Identity</span>
<a name="line-94"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Reader</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Reader</span>
<a name="line-95"></a>
<a name="line-96"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ < 706</span>
<a name="line-97"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>catch</span><span class='hs-layout'>,</span> <span class='hs-varid'>foldr</span><span class='hs-layout'>)</span>
<a name="line-98"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Foldable</span>
<a name="line-99"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-100"></a><span class='hs-cpp'>#elif __GLASGOW_HASKELL__ < 710</span>
<a name="line-101"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>foldr</span><span class='hs-layout'>)</span>
<a name="line-102"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Foldable</span>
<a name="line-103"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-104"></a><span class='hs-cpp'>#endif</span>
<a name="line-105"></a>
<a name="line-106"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-107"></a><span class='hs-comment'>-- $mtl</span>
<a name="line-108"></a><span class='hs-comment'>-- The mtl style typeclass</span>
<a name="line-109"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-110"></a>
<a name="line-111"></a><a name="MonadThrow"></a><span class='hs-comment'>-- | A class for monads in which exceptions may be thrown.</span>
<a name="line-112"></a><a name="MonadThrow"></a><span class='hs-comment'>--</span>
<a name="line-113"></a><a name="MonadThrow"></a><span class='hs-comment'>-- Instances should obey the following law:</span>
<a name="line-114"></a><a name="MonadThrow"></a><span class='hs-comment'>--</span>
<a name="line-115"></a><a name="MonadThrow"></a><span class='hs-comment'>-- > throwM e >> x = throwM e</span>
<a name="line-116"></a><a name="MonadThrow"></a><span class='hs-comment'>--</span>
<a name="line-117"></a><a name="MonadThrow"></a><span class='hs-comment'>-- In other words, throwing an exception short-circuits the rest of the monadic</span>
<a name="line-118"></a><a name="MonadThrow"></a><span class='hs-comment'>-- computation.</span>
<a name="line-119"></a><a name="MonadThrow"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>where</span>
<a name="line-120"></a> <span class='hs-comment'>-- | Throw an exception. Note that this throws when this action is run in</span>
<a name="line-121"></a> <span class='hs-comment'>-- the monad @m@, not when it is applied. It is a generalization of</span>
<a name="line-122"></a> <span class='hs-comment'>-- "Control.Exception"'s 'ControlException.throwIO'.</span>
<a name="line-123"></a> <span class='hs-comment'>--</span>
<a name="line-124"></a> <span class='hs-comment'>-- Should satisfy the law:</span>
<a name="line-125"></a> <span class='hs-comment'>--</span>
<a name="line-126"></a> <span class='hs-comment'>-- > throwM e >> f = throwM e</span>
<a name="line-127"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-128"></a>
<a name="line-129"></a><a name="MonadCatch"></a><span class='hs-comment'>-- | A class for monads which allow exceptions to be caught, in particular</span>
<a name="line-130"></a><a name="MonadCatch"></a><span class='hs-comment'>-- exceptions which were thrown by 'throwM'.</span>
<a name="line-131"></a><a name="MonadCatch"></a><span class='hs-comment'>--</span>
<a name="line-132"></a><a name="MonadCatch"></a><span class='hs-comment'>-- Instances should obey the following law:</span>
<a name="line-133"></a><a name="MonadCatch"></a><span class='hs-comment'>--</span>
<a name="line-134"></a><a name="MonadCatch"></a><span class='hs-comment'>-- > catch (throwM e) f = f e</span>
<a name="line-135"></a><a name="MonadCatch"></a><span class='hs-comment'>--</span>
<a name="line-136"></a><a name="MonadCatch"></a><span class='hs-comment'>-- Note that the ability to catch an exception does /not/ guarantee that we can</span>
<a name="line-137"></a><a name="MonadCatch"></a><span class='hs-comment'>-- deal with all possible exit points from a computation. Some monads, such as</span>
<a name="line-138"></a><a name="MonadCatch"></a><span class='hs-comment'>-- continuation-based stacks, allow for more than just a success/failure</span>
<a name="line-139"></a><a name="MonadCatch"></a><span class='hs-comment'>-- strategy, and therefore @catch@ /cannot/ be used by those monads to properly</span>
<a name="line-140"></a><a name="MonadCatch"></a><span class='hs-comment'>-- implement a function such as @finally@. For more information, see</span>
<a name="line-141"></a><a name="MonadCatch"></a><span class='hs-comment'>-- 'MonadMask'.</span>
<a name="line-142"></a><a name="MonadCatch"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>where</span>
<a name="line-143"></a> <span class='hs-comment'>-- | Provide a handler for exceptions thrown during execution of the first</span>
<a name="line-144"></a> <span class='hs-comment'>-- action. Note that type of the type of the argument to the handler will</span>
<a name="line-145"></a> <span class='hs-comment'>-- constrain which exceptions are caught. See "Control.Exception"'s</span>
<a name="line-146"></a> <span class='hs-comment'>-- 'ControlException.catch'.</span>
<a name="line-147"></a> <span class='hs-varid'>catch</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-148"></a>
<a name="line-149"></a><a name="MonadMask"></a><span class='hs-comment'>-- | A class for monads which provide for the ability to account for all</span>
<a name="line-150"></a><a name="MonadMask"></a><span class='hs-comment'>-- possible exit points from a computation, and to mask asynchronous</span>
<a name="line-151"></a><a name="MonadMask"></a><span class='hs-comment'>-- exceptions. Continuation-based monads, and stacks such as @ErrorT e IO@</span>
<a name="line-152"></a><a name="MonadMask"></a><span class='hs-comment'>-- which provide for multiple failure modes, are invalid instances of this</span>
<a name="line-153"></a><a name="MonadMask"></a><span class='hs-comment'>-- class.</span>
<a name="line-154"></a><a name="MonadMask"></a><span class='hs-comment'>--</span>
<a name="line-155"></a><a name="MonadMask"></a><span class='hs-comment'>-- Note that this package /does/ provide a @MonadMask@ instance for @CatchT@.</span>
<a name="line-156"></a><a name="MonadMask"></a><span class='hs-comment'>-- This instance is /only/ valid if the base monad provides no ability to</span>
<a name="line-157"></a><a name="MonadMask"></a><span class='hs-comment'>-- provide multiple exit. For example, @IO@ or @Either@ would be invalid base</span>
<a name="line-158"></a><a name="MonadMask"></a><span class='hs-comment'>-- monads, but @Reader@ or @State@ would be acceptable.</span>
<a name="line-159"></a><a name="MonadMask"></a><span class='hs-comment'>--</span>
<a name="line-160"></a><a name="MonadMask"></a><span class='hs-comment'>-- Instances should ensure that, in the following code:</span>
<a name="line-161"></a><a name="MonadMask"></a><span class='hs-comment'>--</span>
<a name="line-162"></a><a name="MonadMask"></a><span class='hs-comment'>-- > f `finally` g</span>
<a name="line-163"></a><a name="MonadMask"></a><span class='hs-comment'>--</span>
<a name="line-164"></a><a name="MonadMask"></a><span class='hs-comment'>-- The action @g@ is called regardless of what occurs within @f@, including</span>
<a name="line-165"></a><a name="MonadMask"></a><span class='hs-comment'>-- async exceptions.</span>
<a name="line-166"></a><a name="MonadMask"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyword'>where</span>
<a name="line-167"></a> <span class='hs-comment'>-- | Runs an action with asynchronous exceptions disabled. The action is</span>
<a name="line-168"></a> <span class='hs-comment'>-- provided a method for restoring the async. environment to what it was</span>
<a name="line-169"></a> <span class='hs-comment'>-- at the 'mask' call. See "Control.Exception"'s 'ControlException.mask'.</span>
<a name="line-170"></a> <span class='hs-varid'>mask</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span>
<a name="line-171"></a>
<a name="line-172"></a> <span class='hs-comment'>-- | Like 'mask', but the masked computation is not interruptible (see</span>
<a name="line-173"></a> <span class='hs-comment'>-- "Control.Exception"'s 'ControlException.uninterruptibleMask'. WARNING:</span>
<a name="line-174"></a> <span class='hs-comment'>-- Only use if you need to mask exceptions around an interruptible operation</span>
<a name="line-175"></a> <span class='hs-comment'>-- AND you can guarantee the interruptible operation will only block for a</span>
<a name="line-176"></a> <span class='hs-comment'>-- short period of time. Otherwise you render the program/thread unresponsive</span>
<a name="line-177"></a> <span class='hs-comment'>-- and/or unkillable.</span>
<a name="line-178"></a> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span>
<a name="line-179"></a>
<a name="line-180"></a><a name="instance%20MonadThrow%20%5b%5d"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>where</span>
<a name="line-181"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-182"></a><a name="instance%20MonadThrow%20Maybe"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-conid'>Maybe</span> <span class='hs-keyword'>where</span>
<a name="line-183"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-184"></a><a name="instance%20MonadThrow%20(Either%20e)"></a><span class='hs-keyword'>instance</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>~</span> <span class='hs-conid'>SomeException</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-185"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Left</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toException</span>
<a name="line-186"></a>
<a name="line-187"></a><a name="instance%20MonadThrow%20IO"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-conid'>IO</span> <span class='hs-keyword'>where</span>
<a name="line-188"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ControlException</span><span class='hs-varop'>.</span><span class='hs-varid'>throwIO</span>
<a name="line-189"></a><a name="instance%20MonadCatch%20IO"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-conid'>IO</span> <span class='hs-keyword'>where</span>
<a name="line-190"></a> <span class='hs-varid'>catch</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ControlException</span><span class='hs-varop'>.</span><span class='hs-varid'>catch</span>
<a name="line-191"></a><a name="instance%20MonadMask%20IO"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadMask</span> <span class='hs-conid'>IO</span> <span class='hs-keyword'>where</span>
<a name="line-192"></a> <span class='hs-varid'>mask</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ControlException</span><span class='hs-varop'>.</span><span class='hs-varid'>mask</span>
<a name="line-193"></a> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ControlException</span><span class='hs-varop'>.</span><span class='hs-varid'>uninterruptibleMask</span>
<a name="line-194"></a>
<a name="line-195"></a><a name="instance%20MonadThrow%20STM"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-conid'>STM</span> <span class='hs-keyword'>where</span>
<a name="line-196"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>STM</span><span class='hs-varop'>.</span><span class='hs-varid'>throwSTM</span>
<a name="line-197"></a><a name="instance%20MonadCatch%20STM"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-conid'>STM</span> <span class='hs-keyword'>where</span>
<a name="line-198"></a> <span class='hs-varid'>catch</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>STM</span><span class='hs-varop'>.</span><span class='hs-varid'>catchSTM</span>
<a name="line-199"></a>
<a name="line-200"></a><a name="instance%20MonadThrow%20(IdentityT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-201"></a> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span>
<a name="line-202"></a><a name="instance%20MonadCatch%20(IdentityT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-203"></a> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IdentityT</span> <span class='hs-layout'>(</span><span class='hs-varid'>catch</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>runIdentityT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-204"></a><a name="instance%20MonadMask%20(IdentityT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadMask</span> <span class='hs-layout'>(</span><span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-205"></a> <span class='hs-varid'>mask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IdentityT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runIdentityT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span>
<a name="line-206"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-207"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IdentityT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>u</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runIdentityT</span>
<a name="line-208"></a> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-209"></a> <span class='hs-conid'>IdentityT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runIdentityT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span>
<a name="line-210"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IdentityT</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-211"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IdentityT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>u</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runIdentityT</span>
<a name="line-212"></a>
<a name="line-213"></a><a name="instance%20MonadThrow%20(LazyS.StateT%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-214"></a> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span>
<a name="line-215"></a><a name="instance%20MonadCatch%20(LazyS.StateT%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-216"></a> <span class='hs-varid'>catch</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-varid'>liftCatch</span> <span class='hs-varid'>catch</span>
<a name="line-217"></a><a name="instance%20MonadMask%20(LazyS.StateT%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadMask</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-218"></a> <span class='hs-varid'>mask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-varid'>runStateT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-219"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-220"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-layout'>(</span><span class='hs-varid'>u</span> <span class='hs-varop'>.</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-221"></a> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-222"></a> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-varid'>runStateT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-223"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-224"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-layout'>(</span><span class='hs-varid'>u</span> <span class='hs-varop'>.</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-225"></a>
<a name="line-226"></a><a name="instance%20MonadThrow%20(StrictS.StateT%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-227"></a> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span>
<a name="line-228"></a><a name="instance%20MonadCatch%20(StrictS.StateT%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-229"></a> <span class='hs-varid'>catch</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-varid'>liftCatch</span> <span class='hs-varid'>catch</span>
<a name="line-230"></a><a name="instance%20MonadMask%20(StrictS.StateT%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadMask</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-231"></a> <span class='hs-varid'>mask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-varid'>runStateT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-232"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-233"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-layout'>(</span><span class='hs-varid'>u</span> <span class='hs-varop'>.</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-234"></a> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-235"></a> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-varid'>runStateT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-236"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-237"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictS</span><span class='hs-varop'>.</span><span class='hs-conid'>StateT</span> <span class='hs-layout'>(</span><span class='hs-varid'>u</span> <span class='hs-varop'>.</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-238"></a>
<a name="line-239"></a><a name="instance%20MonadThrow%20(ReaderT%20r%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-240"></a> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span>
<a name="line-241"></a><a name="instance%20MonadCatch%20(ReaderT%20r%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-242"></a> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReaderT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runReaderT</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-243"></a><a name="instance%20MonadMask%20(ReaderT%20r%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadMask</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-244"></a> <span class='hs-varid'>mask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReaderT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runReaderT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>e</span>
<a name="line-245"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReaderT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReaderT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-246"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReaderT</span> <span class='hs-layout'>(</span><span class='hs-varid'>u</span> <span class='hs-varop'>.</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-247"></a> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-248"></a> <span class='hs-conid'>ReaderT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runReaderT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>e</span>
<a name="line-249"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReaderT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReaderT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-250"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>ReaderT</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ReaderT</span> <span class='hs-layout'>(</span><span class='hs-varid'>u</span> <span class='hs-varop'>.</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-251"></a>
<a name="line-252"></a><a name="instance%20MonadThrow%20(StrictW.WriterT%20w%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-253"></a> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span>
<a name="line-254"></a><a name="instance%20MonadCatch%20(StrictW.WriterT%20w%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-255"></a> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>m</span> <span class='hs-varop'>`</span><span class='hs-varid'>catch</span> <span class='hs-varop'>`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span> <span class='hs-layout'>(</span><span class='hs-varid'>h</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-256"></a><a name="instance%20MonadMask%20(StrictW.WriterT%20w%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadMask</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-257"></a> <span class='hs-varid'>mask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span>
<a name="line-258"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-259"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-260"></a> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-261"></a> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span>
<a name="line-262"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-263"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictW</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-264"></a>
<a name="line-265"></a><a name="instance%20MonadThrow%20(LazyW.WriterT%20w%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-266"></a> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span>
<a name="line-267"></a><a name="instance%20MonadCatch%20(LazyW.WriterT%20w%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-268"></a> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>m</span> <span class='hs-varop'>`</span><span class='hs-varid'>catch</span> <span class='hs-varop'>`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span> <span class='hs-layout'>(</span><span class='hs-varid'>h</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-269"></a><a name="instance%20MonadMask%20(LazyW.WriterT%20w%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadMask</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-270"></a> <span class='hs-varid'>mask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span>
<a name="line-271"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-272"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-273"></a> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-274"></a> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span>
<a name="line-275"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varid'>w</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-276"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-conid'>WriterT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyW</span><span class='hs-varop'>.</span><span class='hs-varid'>runWriterT</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-277"></a>
<a name="line-278"></a><a name="instance%20MonadThrow%20(LazyRWS.RWST%20r%20w%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-279"></a> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span>
<a name="line-280"></a><a name="instance%20MonadCatch%20(LazyRWS.RWST%20r%20w%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-281"></a> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-varid'>runRWST</span> <span class='hs-layout'>(</span><span class='hs-varid'>h</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span>
<a name="line-282"></a><a name="instance%20MonadMask%20(LazyRWS.RWST%20r%20w%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadMask</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-283"></a> <span class='hs-varid'>mask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-varid'>runRWST</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span>
<a name="line-284"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-285"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-286"></a> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-287"></a> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-varid'>runRWST</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span>
<a name="line-288"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-289"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LazyRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-290"></a>
<a name="line-291"></a><a name="instance%20MonadThrow%20(StrictRWS.RWST%20r%20w%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-292"></a> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span>
<a name="line-293"></a><a name="instance%20MonadCatch%20(StrictRWS.RWST%20r%20w%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-294"></a> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-varid'>runRWST</span> <span class='hs-layout'>(</span><span class='hs-varid'>h</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span>
<a name="line-295"></a><a name="instance%20MonadMask%20(StrictRWS.RWST%20r%20w%20s%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadMask</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-296"></a> <span class='hs-varid'>mask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-varid'>runRWST</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span>
<a name="line-297"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-298"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-299"></a> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-300"></a> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>u</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-varid'>runRWST</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>$</span> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span>
<a name="line-301"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>q</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>r</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-302"></a> <span class='hs-varid'>q</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StrictRWS</span><span class='hs-varop'>.</span><span class='hs-conid'>RWST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-303"></a>
<a name="line-304"></a><a name="instance%20MonadThrow%20(ListT%20m)"></a><span class='hs-comment'>-- Transformers which are only instances of MonadThrow and MonadCatch, not MonadMask</span>
<a name="line-305"></a><a name="instance%20MonadThrow%20(ListT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>ListT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-306"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>throwM</span>
<a name="line-307"></a><a name="instance%20MonadCatch%20(ListT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>ListT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-308"></a> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>ListT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ListT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>catch</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>runListT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-309"></a>
<a name="line-310"></a><a name="instance%20MonadThrow%20(MaybeT%20m)"></a><span class='hs-comment'>-- | Throws exceptions into the base monad.</span>
<a name="line-311"></a><a name="instance%20MonadThrow%20(MaybeT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-312"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>throwM</span>
<a name="line-313"></a><a name="instance%20MonadCatch%20(MaybeT%20m)"></a><span class='hs-comment'>-- | Catches exceptions from the base monad.</span>
<a name="line-314"></a><a name="instance%20MonadCatch%20(MaybeT%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-315"></a> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>MaybeT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MaybeT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>catch</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>runMaybeT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-316"></a>
<a name="line-317"></a><a name="instance%20MonadThrow%20(ErrorT%20e%20m)"></a><span class='hs-comment'>-- | Throws exceptions into the base monad.</span>
<a name="line-318"></a><a name="instance%20MonadThrow%20(ErrorT%20e%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-319"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>throwM</span>
<a name="line-320"></a><a name="instance%20MonadCatch%20(ErrorT%20e%20m)"></a><span class='hs-comment'>-- | Catches exceptions from the base monad.</span>
<a name="line-321"></a><a name="instance%20MonadCatch%20(ErrorT%20e%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Error</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-322"></a> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>ErrorT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ErrorT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>catch</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>runErrorT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-323"></a>
<a name="line-324"></a><a name="instance%20MonadThrow%20(ExceptT%20e%20m)"></a><span class='hs-comment'>-- | Throws exceptions into the base monad.</span>
<a name="line-325"></a><a name="instance%20MonadThrow%20(ExceptT%20e%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-326"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>throwM</span>
<a name="line-327"></a><a name="instance%20MonadCatch%20(ExceptT%20e%20m)"></a><span class='hs-comment'>-- | Catches exceptions from the base monad.</span>
<a name="line-328"></a><a name="instance%20MonadCatch%20(ExceptT%20e%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadCatch</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span> <span class='hs-varid'>e</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-329"></a> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>ExceptT</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ExceptT</span> <span class='hs-varop'>$</span> <span class='hs-varid'>catch</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>runExceptT</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-330"></a>
<a name="line-331"></a><a name="instance%20MonadThrow%20(ContT%20r%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MonadThrow</span> <span class='hs-layout'>(</span><span class='hs-conid'>ContT</span> <span class='hs-varid'>r</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-332"></a> <span class='hs-varid'>throwM</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>throwM</span>
<a name="line-333"></a><span class='hs-comment'>-- I don't believe any valid of MonadCatch exists for ContT.</span>
<a name="line-334"></a><span class='hs-comment'>-- instance MonadCatch m => MonadCatch (ContT r m) where</span>
<a name="line-335"></a>
<a name="line-336"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-337"></a><span class='hs-comment'>-- $utilities</span>
<a name="line-338"></a><span class='hs-comment'>-- These functions follow those from "Control.Exception", except that they are</span>
<a name="line-339"></a><span class='hs-comment'>-- based on methods from the 'MonadCatch' typeclass. See</span>
<a name="line-340"></a><span class='hs-comment'>-- "Control.Exception" for API usage.</span>
<a name="line-341"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-342"></a>
<a name="line-343"></a><a name="mask_"></a><span class='hs-comment'>-- | Like 'mask', but does not pass a @restore@ action to the argument.</span>
<a name="line-344"></a><span class='hs-definition'>mask_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-345"></a><span class='hs-definition'>mask_</span> <span class='hs-varid'>io</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>io</span>
<a name="line-346"></a>
<a name="line-347"></a><a name="uninterruptibleMask_"></a><span class='hs-comment'>-- | Like 'uninterruptibleMask', but does not pass a @restore@ action to the</span>
<a name="line-348"></a><span class='hs-comment'>-- argument.</span>
<a name="line-349"></a><span class='hs-definition'>uninterruptibleMask_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-350"></a><span class='hs-definition'>uninterruptibleMask_</span> <span class='hs-varid'>io</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>uninterruptibleMask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>io</span>
<a name="line-351"></a>
<a name="line-352"></a><a name="catchAll"></a><span class='hs-comment'>-- | Catches all exceptions, and somewhat defeats the purpose of the extensible</span>
<a name="line-353"></a><span class='hs-comment'>-- exception system. Use sparingly.</span>
<a name="line-354"></a><span class='hs-definition'>catchAll</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>SomeException</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-355"></a><span class='hs-definition'>catchAll</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catch</span>
<a name="line-356"></a>
<a name="line-357"></a><a name="catchIOError"></a><span class='hs-comment'>-- | Catch all 'IOError' (eqv. 'IOException') exceptions. Still somewhat too</span>
<a name="line-358"></a><span class='hs-comment'>-- general, but better than using 'catchAll'. See 'catchIf' for an easy way</span>
<a name="line-359"></a><span class='hs-comment'>-- of catching specific 'IOError's based on the predicates in "System.IO.Error".</span>
<a name="line-360"></a><span class='hs-definition'>catchIOError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>IOError</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-361"></a><span class='hs-definition'>catchIOError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catch</span>
<a name="line-362"></a>
<a name="line-363"></a><a name="catchIf"></a><span class='hs-comment'>-- | Catch exceptions only if they pass some predicate. Often useful with the</span>
<a name="line-364"></a><span class='hs-comment'>-- predicates for testing 'IOError' values in "System.IO.Error".</span>
<a name="line-365"></a><span class='hs-definition'>catchIf</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-366"></a> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-367"></a><span class='hs-definition'>catchIf</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>if</span> <span class='hs-varid'>f</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>b</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span>
<a name="line-368"></a>
<a name="line-369"></a><a name="catchJust"></a><span class='hs-comment'>-- | A more generalized way of determining which exceptions to catch at</span>
<a name="line-370"></a><span class='hs-comment'>-- run time.</span>
<a name="line-371"></a><span class='hs-definition'>catchJust</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-372"></a> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-373"></a><span class='hs-definition'>catchJust</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`catch`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span> <span class='hs-varid'>e</span>
<a name="line-374"></a>
<a name="line-375"></a><a name="handle"></a><span class='hs-comment'>-- | Flipped 'catch'. See "Control.Exception"'s 'ControlException.handle'.</span>
<a name="line-376"></a><span class='hs-definition'>handle</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-377"></a><span class='hs-definition'>handle</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flip</span> <span class='hs-varid'>catch</span>
<a name="line-378"></a><span class='hs-comment'>{-# INLINE handle #-}</span>
<a name="line-379"></a>
<a name="line-380"></a><a name="handleIOError"></a><span class='hs-comment'>-- | Flipped 'catchIOError'</span>
<a name="line-381"></a><span class='hs-definition'>handleIOError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-conid'>IOError</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-382"></a><span class='hs-definition'>handleIOError</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>handle</span>
<a name="line-383"></a>
<a name="line-384"></a><a name="handleAll"></a><span class='hs-comment'>-- | Flipped 'catchAll'</span>
<a name="line-385"></a><span class='hs-definition'>handleAll</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-conid'>SomeException</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-386"></a><span class='hs-definition'>handleAll</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>handle</span>
<a name="line-387"></a>
<a name="line-388"></a><a name="handleIf"></a><span class='hs-comment'>-- | Flipped 'catchIf'</span>
<a name="line-389"></a><span class='hs-definition'>handleIf</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-390"></a><span class='hs-definition'>handleIf</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flip</span> <span class='hs-layout'>(</span><span class='hs-varid'>catchIf</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-391"></a>
<a name="line-392"></a><a name="handleJust"></a><span class='hs-comment'>-- | Flipped 'catchJust'. See "Control.Exception"'s 'ControlException.handleJust'.</span>
<a name="line-393"></a><span class='hs-definition'>handleJust</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-394"></a><span class='hs-definition'>handleJust</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flip</span> <span class='hs-layout'>(</span><span class='hs-varid'>catchJust</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-395"></a><span class='hs-comment'>{-# INLINE handleJust #-}</span>
<a name="line-396"></a>
<a name="line-397"></a><a name="try"></a><span class='hs-comment'>-- | Similar to 'catch', but returns an 'Either' result. See "Control.Exception"'s</span>
<a name="line-398"></a><span class='hs-comment'>-- 'Control.Exception.try'.</span>
<a name="line-399"></a><span class='hs-definition'>try</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-varid'>e</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-400"></a><span class='hs-definition'>try</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Left</span><span class='hs-layout'>)</span>
<a name="line-401"></a>
<a name="line-402"></a><a name="tryJust"></a><span class='hs-comment'>-- | A variant of 'try' that takes an exception predicate to select</span>
<a name="line-403"></a><span class='hs-comment'>-- which exceptions are caught. See "Control.Exception"'s 'ControlException.tryJust'</span>
<a name="line-404"></a><span class='hs-definition'>tryJust</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-405"></a> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-406"></a><span class='hs-definition'>tryJust</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Left</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-407"></a>
<a name="line-408"></a><a name="Handler"></a><span class='hs-comment'>-- | Generalized version of 'ControlException.Handler'</span>
<a name="line-409"></a><a name="Handler"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Handler</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>e</span> <span class='hs-varop'>.</span> <span class='hs-conid'>ControlException</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Handler</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-410"></a>
<a name="line-411"></a><a name="instance%20Functor%20(Handler%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Functor</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handler</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-412"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handler</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Handler</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftM</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span>
<a name="line-413"></a>
<a name="line-414"></a><a name="catches"></a><span class='hs-comment'>-- | Catches different sorts of exceptions. See "Control.Exception"'s 'ControlException.catches'</span>
<a name="line-415"></a><span class='hs-definition'>catches</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Foldable</span> <span class='hs-varid'>f</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handler</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-416"></a><span class='hs-definition'>catches</span> <span class='hs-varid'>a</span> <span class='hs-varid'>hs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`catch`</span> <span class='hs-varid'>handler</span>
<a name="line-417"></a> <span class='hs-keyword'>where</span>
<a name="line-418"></a> <span class='hs-varid'>handler</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-varid'>probe</span> <span class='hs-layout'>(</span><span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>hs</span>
<a name="line-419"></a> <span class='hs-keyword'>where</span>
<a name="line-420"></a> <span class='hs-varid'>probe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handler</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>h</span> <span class='hs-layout'>(</span><span class='hs-conid'>ControlException</span><span class='hs-varop'>.</span><span class='hs-varid'>fromException</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-421"></a>
<a name="line-422"></a><a name="onException"></a><span class='hs-comment'>-- | Run an action only if an exception is thrown in the main action. The</span>
<a name="line-423"></a><span class='hs-comment'>-- exception is not caught, simply rethrown.</span>
<a name="line-424"></a><span class='hs-definition'>onException</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadCatch</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-425"></a><span class='hs-definition'>onException</span> <span class='hs-varid'>action</span> <span class='hs-varid'>handler</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>action</span> <span class='hs-varop'>`catchAll`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>handler</span> <span class='hs-varop'>>></span> <span class='hs-varid'>throwM</span> <span class='hs-varid'>e</span>
<a name="line-426"></a>
<a name="line-427"></a><a name="bracket"></a><span class='hs-comment'>-- | Generalized abstracted pattern of safe resource acquisition and release</span>
<a name="line-428"></a><span class='hs-comment'>-- in the face of exceptions. The first action \"acquires\" some value, which</span>
<a name="line-429"></a><span class='hs-comment'>-- is \"released\" by the second action at the end. The third action \"uses\"</span>
<a name="line-430"></a><span class='hs-comment'>-- the value and its result is the result of the 'bracket'.</span>
<a name="line-431"></a><span class='hs-comment'>--</span>
<a name="line-432"></a><span class='hs-comment'>-- If an exception occurs during the use, the release still happens before the</span>
<a name="line-433"></a><span class='hs-comment'>-- exception is rethrown.</span>
<a name="line-434"></a><span class='hs-definition'>bracket</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span>
<a name="line-435"></a><span class='hs-definition'>bracket</span> <span class='hs-varid'>acquire</span> <span class='hs-varid'>release</span> <span class='hs-varid'>use</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>unmasked</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-436"></a> <span class='hs-varid'>resource</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>acquire</span>
<a name="line-437"></a> <span class='hs-varid'>result</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unmasked</span> <span class='hs-layout'>(</span><span class='hs-varid'>use</span> <span class='hs-varid'>resource</span><span class='hs-layout'>)</span> <span class='hs-varop'>`onException`</span> <span class='hs-varid'>release</span> <span class='hs-varid'>resource</span>
<a name="line-438"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>release</span> <span class='hs-varid'>resource</span>
<a name="line-439"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>result</span>
<a name="line-440"></a>
<a name="line-441"></a><a name="bracket_"></a><span class='hs-comment'>-- | Version of 'bracket' without any value being passed to the second and</span>
<a name="line-442"></a><span class='hs-comment'>-- third actions.</span>
<a name="line-443"></a><span class='hs-definition'>bracket_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span>
<a name="line-444"></a><span class='hs-definition'>bracket_</span> <span class='hs-varid'>before</span> <span class='hs-varid'>after</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bracket</span> <span class='hs-varid'>before</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varid'>after</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varid'>action</span><span class='hs-layout'>)</span>
<a name="line-445"></a>
<a name="line-446"></a><a name="finally"></a><span class='hs-comment'>-- | Perform an action with a finalizer action that is run, even if an</span>
<a name="line-447"></a><span class='hs-comment'>-- exception occurs.</span>
<a name="line-448"></a><span class='hs-definition'>finally</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-449"></a><span class='hs-definition'>finally</span> <span class='hs-varid'>action</span> <span class='hs-varid'>finalizer</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bracket_</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>finalizer</span> <span class='hs-varid'>action</span>
<a name="line-450"></a>
<a name="line-451"></a><a name="bracketOnError"></a><span class='hs-comment'>-- | Like 'bracket', but only performs the final action if there was an</span>
<a name="line-452"></a><span class='hs-comment'>-- exception raised by the in-between computation.</span>
<a name="line-453"></a><span class='hs-definition'>bracketOnError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadMask</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>c</span>
<a name="line-454"></a><span class='hs-definition'>bracketOnError</span> <span class='hs-varid'>acquire</span> <span class='hs-varid'>release</span> <span class='hs-varid'>use</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mask</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>unmasked</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-455"></a> <span class='hs-varid'>resource</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>acquire</span>
<a name="line-456"></a> <span class='hs-varid'>unmasked</span> <span class='hs-layout'>(</span><span class='hs-varid'>use</span> <span class='hs-varid'>resource</span><span class='hs-layout'>)</span> <span class='hs-varop'>`onException`</span> <span class='hs-varid'>release</span> <span class='hs-varid'>resource</span>
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