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

<module>
  <inherits name="com.google.gwt.dev.testdata.incrementalbuildsystem.ParallelLeft" />
  <inherits name="com.google.gwt.dev.testdata.incrementalbuildsystem.ParallelRight" />
  <source path="" includes="SomeClass.java" />
</module>