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http://issues.apache.org/bugzilla/show_bug.cgi?id=39694

           Summary: <macrodef>: multiple use of element inside nested
                    <patternset>s fails
           Product: Ant
           Version: 1.6.5
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core tasks
        AssignedTo: dev@ant.apache.org
        ReportedBy: [EMAIL PROTECTED]


When a <macrodef> has a nested <copy> with two nested <fileset>s each of which
referencing the same <element>, Ant fails with: 
BUILD FAILED
/qv/apps/u117424/elements.xml:10: The following error occurred while executing
this line:
/qv/apps/u117424/elements.xml:20: Missing attribute "name" for a pattern

However this should be a legal operation.

It appears that the first use of the element is destructive, causing some/all
element data to be null upon the second use.

e.g.
    <copy todir="outdir">
      <fileset>
        <myelement/>
      </fileset>
      <fileset>
        <myelement/>   <!-- myelement->* == null !! -->
     </fileset>
    </copy>

The second instance of myelement appears to be nullified by the first.

Attached build.xml to follow demonstrating the failure.

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