The guts of prod/AxisStep.xml#Axes112 are:
      <dependency type="spec" value="XQ30+"/>
      <test>/*/namespace-node()</test>
      <result>
         <error code="XPST0003"/><!-- unclear, see bug 20736 -->
      </result>

Bug 20736
    https://www.w3.org/Bugs/Public/show_bug.cgi?id=20736
was resolved on 2013-01-29:
    https://lists.w3.org/Archives/Member/w3c-xsl-query/2013Jan/0088.html
resulting in this text in the XQuery 3.0 spec:
    If the axis name is omitted from an axis step, ...
    if the NodeTest in an axis step is a NamespaceNodeTest
    then a static error is raised [err:XQST0134]

(where the Appendix F blurb for XQST0134 is:
"XQuery 3.0 does not support the namespace axis.")

So presumably the <result> of this test-case should be changed to:
    <error code="XPST0134"/>