import libxml2

libxml2.debugMemory(True)

d = libxml2.parseDoc("<fish/>")
for expr in ("/fish[.=$var]", "local-name('one','two')", "~?)%^*("):
    try:
        result = d.xpathEval(expr)
    except libxml2.xpathError, e:
        print "xpathError raised:", e
    else:
        raise ValueError("Unexpected success", expr, result)
d.freeDoc()

libxml2.cleanupParser()
leakedbytes = libxml2.debugMemory(True)
if leakedbytes == 0:
    print "OK"
else:
    print "Memory leak", leakedbytes, "bytes"
    # drop file to .memdump file in cwd, but won't work if not compiled in
    libxml2.dumpMemory()