b>
<p>
<div class=slotDescription>
Evaluates code in the context of sender. Returns self.
  <br/>
  Another form is <tt>Error ifError(error, code)</tt>. 
  Note: <tt>error</tt> slot is set in the context of sender, Locals object is not created!
</div>
<a name="Error-isError"></a><b>
isError
</b>
<p>
<div class=slotDescription>
Returns true.
</div>
<a name="Error-raiseIfError"></a><b>
raiseIfError
</b>
<p>
<div class=slotDescription>
Raises exception.
</div>
<a name="Error-returnIfError"></a><b>
returnIfErro