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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">ghc-7.4.2: The GHC API</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Safe Haskell</th><td>None</td></tr></table><p class="caption">IOEnv</p></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><span class="keyword">data</span>  <a href="#t:IOEnv">IOEnv</a> env a</li><li class="src short">module <a href="MonadUtils.html">MonadUtils</a></li><li class="src short"><a href="#v:failM">failM</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</li><li class="src short"><a href="#v:failWithM">failWithM</a> ::  <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</li><li class="src short"><span class="keyword">data</span>  <a href="#t:IOEnvFailure">IOEnvFailure</a>  = <a href="#v:IOEnvFailure">IOEnvFailure</a></li><li class="src short"><a href="#v:getEnv">getEnv</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env env</li><li class="src short"><a href="#v:setEnv">setEnv</a> ::  env' -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env' a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</li><li class="src short"><a href="#v:updEnv">updEnv</a> ::  (env -&gt; env') -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env' a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</li><li class="src short"><a href="#v:runIOEnv">runIOEnv</a> ::  env -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> a</li><li class="src short"><a href="#v:unsafeInterleaveM">unsafeInterleaveM</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</li><li class="src short"><a href="#v:tryM">tryM</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env r -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env (<a href="../base-4.5.1.0/Data-Either.html#t:Either">Either</a> <a href="IOEnv.html#t:IOEnvFailure">IOEnvFailure</a> r)</li><li class="src short"><a href="#v:tryAllM">tryAllM</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env r -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env (<a href="../base-4.5.1.0/Data-Either.html#t:Either">Either</a> <a href="../base-4.5.1.0/Control-Exception-Base.html#t:SomeException">SomeException</a> r)</li><li class="src short"><a href="#v:tryMostM">tryMostM</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env r -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env (<a href="../base-4.5.1.0/Data-Either.html#t:Either">Either</a> <a href="../base-4.5.1.0/Control-Exception-Base.html#t:SomeException">SomeException</a> r)</li><li class="src short"><a href="#v:fixM">fixM</a> ::  (a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a) -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</li><li class="src short"><span class="keyword">data</span>  <a href="#t:IORef">IORef</a> a</li><li class="src short"><a href="#v:newMutVar">newMutVar</a> ::  a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env (<a href="IOEnv.html#t:IORef">IORef</a> a)</li><li class="src short"><a href="#v:readMutVar">readMutVar</a> ::  <a href="IOEnv.html#t:IORef">IORef</a> a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</li><li class="src short"><a href="#v:writeMutVar">writeMutVar</a> ::  <a href="IOEnv.html#t:IORef">IORef</a> a -&gt; a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env ()</li><li class="src short"><a href="#v:updMutVar">updMutVar</a> ::  <a href="IOEnv.html#t:IORef">IORef</a> a -&gt; (a -&gt; a) -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env ()</li><li class="src short"><a href="#v:atomicUpdMutVar">atomicUpdMutVar</a> ::  <a href="IOEnv.html#t:IORef">IORef</a> a -&gt; (a -&gt; (a, b)) -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env b</li><li class="src short"><a href="#v:atomicUpdMutVar-39-">atomicUpdMutVar'</a> ::  <a href="IOEnv.html#t:IORef">IORef</a> a -&gt; (a -&gt; (a, b)) -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env b</li></ul></div><div id="interface"><h1>Documentation</h1><div class="top"><p class="src"><span class="keyword">data</span>  <a name="t:IOEnv" class="def">IOEnv</a> env a </p><div class="subs instances"><p id="control.i:IOEnv" class="caption collapser" onclick="toggleSection('i:IOEnv')">Instances</p><div id="section.i:IOEnv" class="show"><table><tr><td class="src"><a href="../base-4.5.1.0/Control-Monad.html#t:Monad">Monad</a> (<a href="IOEnv.html#t:IOEnv">IOEnv</a> m)</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="../base-4.5.1.0/Control-Monad.html#t:Functor">Functor</a> (<a href="IOEnv.html#t:IOEnv">IOEnv</a> m)</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="../base-4.5.1.0/Control-Monad.html#t:MonadPlus">MonadPlus</a> <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> =&gt; <a href="../base-4.5.1.0/Control-Monad.html#t:MonadPlus">MonadPlus</a> (<a href="IOEnv.html#t:IOEnv">IOEnv</a> env)</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="MonadUtils.html#t:Applicative">Applicative</a> (<a href="IOEnv.html#t:IOEnv">IOEnv</a> m)</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="../template-haskell-2.7.0.0/Language-Haskell-TH-Syntax.html#t:Quasi">Quasi</a> (<a href="IOEnv.html#t:IOEnv">IOEnv</a> (<a href="TcRnTypes.html#t:Env">Env</a> <a href="TcRnTypes.html#t:TcGblEnv">TcGblEnv</a> <a href="TcRnTypes.html#t:TcLclEnv">TcLclEnv</a>))</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="MonadUtils.html#t:MonadIO">MonadIO</a> (<a href="IOEnv.html#t:IOEnv">IOEnv</a> env)</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="UniqSupply.html#t:MonadUnique">MonadUnique</a> (<a href="IOEnv.html#t:IOEnv">IOEnv</a> (<a href="TcRnTypes.html#t:Env">Env</a> gbl lcl))</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="HscTypes.html#t:MonadThings">MonadThings</a> (<a href="IOEnv.html#t:IOEnv">IOEnv</a> (<a href="TcRnTypes.html#t:Env">Env</a> <a href="TcRnTypes.html#t:TcGblEnv">TcGblEnv</a> <a href="TcRnTypes.html#t:TcLclEnv">TcLclEnv</a>))</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="HscTypes.html#t:MonadThings">MonadThings</a> (<a href="IOEnv.html#t:IOEnv">IOEnv</a> (<a href="TcRnTypes.html#t:Env">Env</a> DsGblEnv DsLclEnv))</td><td class="doc empty">&nbsp;</td></tr></table></div></div></div><div class="top"><p class="src">module <a href="MonadUtils.html">MonadUtils</a></p></div><div class="top"><p class="src"><a name="v:failM" class="def">failM</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</p></div><div class="top"><p class="src"><a name="v:failWithM" class="def">failWithM</a> ::  <a href="../base-4.5.1.0/Data-String.html#t:String">String</a> -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</p></div><div class="top"><p class="src"><span class="keyword">data</span>  <a name="t:IOEnvFailure" class="def">IOEnvFailure</a>  </p><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:IOEnvFailure" class="def">IOEnvFailure</a></td><td class="doc empty">&nbsp;</td></tr></table></div><div class="subs instances"><p id="control.i:IOEnvFailure" class="caption collapser" onclick="toggleSection('i:IOEnvFailure')">Instances</p><div id="section.i:IOEnvFailure" class="show"><table><tr><td class="src"><a href="../base-4.5.1.0/Text-Show.html#t:Show">Show</a> <a href="IOEnv.html#t:IOEnvFailure">IOEnvFailure</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="../base-4.5.1.0/Data-Typeable-Internal.html#t:Typeable">Typeable</a> <a href="IOEnv.html#t:IOEnvFailure">IOEnvFailure</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Panic.html#t:Exception">Exception</a> <a href="IOEnv.html#t:IOEnvFailure">IOEnvFailure</a></td><td class="doc empty">&nbsp;</td></tr></table></div></div></div><div class="top"><p class="src"><a name="v:getEnv" class="def">getEnv</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env env</p></div><div class="top"><p class="src"><a name="v:setEnv" class="def">setEnv</a> ::  env' -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env' a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</p><div class="doc"><p>Perform a computation with a different environment
</p></div></div><div class="top"><p class="src"><a name="v:updEnv" class="def">updEnv</a> ::  (env -&gt; env') -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env' a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</p><div class="doc"><p>Perform a computation with an altered environment
</p></div></div><div class="top"><p class="src"><a name="v:runIOEnv" class="def">runIOEnv</a> ::  env -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a -&gt; <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> a</p></div><div class="top"><p class="src"><a name="v:unsafeInterleaveM" class="def">unsafeInterleaveM</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</p></div><div class="top"><p class="src"><a name="v:tryM" class="def">tryM</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env r -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env (<a href="../base-4.5.1.0/Data-Either.html#t:Either">Either</a> <a href="IOEnv.html#t:IOEnvFailure">IOEnvFailure</a> r)</p></div><div class="top"><p class="src"><a name="v:tryAllM" class="def">tryAllM</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env r -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env (<a href="../base-4.5.1.0/Data-Either.html#t:Either">Either</a> <a href="../base-4.5.1.0/Control-Exception-Base.html#t:SomeException">SomeException</a> r)</p></div><div class="top"><p class="src"><a name="v:tryMostM" class="def">tryMostM</a> ::  <a href="IOEnv.html#t:IOEnv">IOEnv</a> env r -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env (<a href="../base-4.5.1.0/Data-Either.html#t:Either">Either</a> <a href="../base-4.5.1.0/Control-Exception-Base.html#t:SomeException">SomeException</a> r)</p></div><div class="top"><p class="src"><a name="v:fixM" class="def">fixM</a> ::  (a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a) -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</p></div><div class="top"><p class="src"><span class="keyword">data</span>  <a name="t:IORef" class="def">IORef</a> a <a href="../base-4.5.1.0/src/GHC-IORef.html#IORef" class="link">Source</a></p><div class="doc"><p>A mutable variable in the <code><a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a></code> monad
</p></div><div class="subs instances"><p id="control.i:IORef" class="caption collapser" onclick="toggleSection('i:IORef')">Instances</p><div id="section.i:IORef" class="show"><table><tr><td class="src"><a href="../base-4.5.1.0/Data-Typeable-Internal.html#t:Typeable1">Typeable1</a> <a href="IOEnv.html#t:IORef">IORef</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="../base-4.5.1.0/Data-Eq.html#t:Eq">Eq</a> (<a href="IOEnv.html#t:IORef">IORef</a> a)</td><td class="doc empty">&nbsp;</td></tr></table></div></div></div><div class="top"><p class="src"><a name="v:newMutVar" class="def">newMutVar</a> ::  a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env (<a href="IOEnv.html#t:IORef">IORef</a> a)</p></div><div class="top"><p class="src"><a name="v:readMutVar" class="def">readMutVar</a> ::  <a href="IOEnv.html#t:IORef">IORef</a> a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env a</p></div><div class="top"><p class="src"><a name="v:writeMutVar" class="def">writeMutVar</a> ::  <a href="IOEnv.html#t:IORef">IORef</a> a -&gt; a -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env ()</p></div><div class="top"><p class="src"><a name="v:updMutVar" class="def">updMutVar</a> ::  <a href="IOEnv.html#t:IORef">IORef</a> a -&gt; (a -&gt; a) -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env ()</p></div><div class="top"><p class="src"><a name="v:atomicUpdMutVar" class="def">atomicUpdMutVar</a> ::  <a href="IOEnv.html#t:IORef">IORef</a> a -&gt; (a -&gt; (a, b)) -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env b</p><div class="doc"><p>Atomically update the reference.  Does not force the evaluation of the
 new variable contents.  For strict update, use <code><a href="IOEnv.html#v:atomicUpdMutVar-39-">atomicUpdMutVar'</a></code>.
</p></div></div><div class="top"><p class="src"><a name="v:atomicUpdMutVar-39-" class="def">atomicUpdMutVar'</a> ::  <a href="IOEnv.html#t:IORef">IORef</a> a -&gt; (a -&gt; (a, b)) -&gt; <a href="IOEnv.html#t:IOEnv">IOEnv</a> env b</p><div class="doc"><p>Strict variant of <code><a href="IOEnv.html#v:atomicUpdMutVar">atomicUpdMutVar</a></code>.
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