<test-case name="try-012">
    <description>Use err:description local variable, implicitly declared</description>
    <created by="O'Neil Delpratt" on="2012-03-02"/>
    <environment ref="err"/><test><![CDATA[
        declare function local:f($d as xs:integer) { 10 div $d };
        try { local:f(0) } catch * {$err:description}
      ]]></test>
    <result>
      <any-of>
        <assert-string-value>Integer division by zero</assert-string-value>
        <assert-type>xs:string</assert-type>
      </any-of>
    </result>
  </test-case>

I don't think an error description is defined for err:FOAR0001 so this test shouldn't assert description "Integer division by zero".  Also, I think it is valid for $err:description to be empty.