user/test/com/google/gwt/dev/testdata/incrementalbuildsystem/DuplicateRoot.gwt.xml

<module>
  <inherits name="com.google.gwt.dev.testdata.incrementalbuildsystem.DuplicateLeft" />
  <inherits name="com.google.gwt.dev.testdata.incrementalbuildsystem.DuplicateRight" />
</module>