Index: IXR/class-IXR-introspectionserver.php
===================================================================
--- IXR/class-IXR-introspectionserver.php	(revision 56283)
+++ IXR/class-IXR-introspectionserver.php	(working copy)
@@ -75,7 +75,6 @@
         }
         $method = $this->callbacks[$methodname];
         $signature = $this->signatures[$methodname];
-        $returnType = array_shift($signature);
 
         // Check the number of arguments
         if (count($args) != count($signature)) {