libxml2.debugMemory(True)
expect="""--> Invalid expression
---> xmlXPathEval: evaluation failed
--> Invalid expression
---> xmlXPathEval: evaluation failed
--> Invalid expression
---> xmlXPathEval: evaluation failed
--> Invalid expression
---> xmlXPathEval: evaluation failed
--> Invalid expression
---> xmlXPathEval: evaluation failed
--> Invalid expression
---> xmlXPathEval: evaluation failed
--> Invalid expression
---> xmlXPathEval: evaluation failed
--> Invalid expression
---> xmlXPathEval: evaluation failed
--> Invalid expression
---> xmlXPathEval: evaluation failed
--> Invalid expression
---> xmlXPathEval: evaluation failed
"""
err=""
def callback(ctx, str):