There is a typo in this test.

let $x e :=

should be

let $x :=

<test-case name="K2-DataFunc-3" covers="fn-data">
      <description> fn:data() allows zero arguments in XP30/XQ30. </description>
      <created by="Michael Kay" on="2012-09-27"/>
      <dependency type="spec" value="XQ30+"/>
      <test><![CDATA[
      	let $x e := <e><f>1</f></e>
      	return $x/data()
      ]]>	
      </test>
      <result>
        <all-of>
          <assert-string-value>1</assert-string-value>
          <assert-type>xs:untypedAtomic</assert-type>
        </all-of>  
      </result>
   </test-case>