etwork-Mom-Stompl-Patterns-Basic.html#t:OnError">OnError</a></code>: Error Handler;
</li><li> IO r: Action that definex the proxy's lifetime;
           its result <em>r</em> is also the result of <em>withPubProxy</em>.
</li></ul></div></div><h1 id="g:11">Exceptions and Error Handling
</h1><div class="top"><p class="src"><span class="keyword">data</span>  <a name="t:PatternsException" class="def">PatternsException</a>  </p><div class="doc"><p>Patterns Exception
</p></div><div class="subs constructors"><p cl