Declare step 017 (AB)

The pipeline

<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:p="http://www.w3.org/ns/xproc" xmlns:test="http://test" version="3.0" type="test:test">
   <p:output port="result"/>
   <p:declare-step type="test:test">
      <p:output port="result"/>
      <p:identity>
         <p:with-input>
            <test-failed/>
         </p:with-input>
      </p:identity>
   </p:declare-step>
   <p:identity>
      <p:with-input>
         <test-failed/>
      </p:with-input>
   </p:identity>
</p:declare-step>