# Collect classfiles (absolute) that were claimed by sources (relative)
      for source in compile_context.sources:
        classes = computed_classes_by_source.get(source, [])
        add_products_by_target(classes)
        if classes_by_source is not None:
          classes_by_source[source].add_abs_paths(classes_dir, classes)

      # And any that were not claimed by sources (NB: `None` map key.)
      unclaimed_classes = computed_classes_by_source.get(None, [])
      if unclaimed_classes:
        self.context.log.debug(
          items_to_report_element(unclaimed_classes, 'class'),
          ' not claimed by analysis for ',
          str(compile_context.target)
        )
        add_products_by_target(unclaimed_classes)