Review

class IRFactory.TransformDispatcher {
    @Override
    Node processAssignment(Assignment assignmentNode) {
      Node assign = processInfixExpression(assignmentNode);
      Node target = assign.getFirstChild();
      if (!validAssignmentTarget(target)) {
        errorReporter.error(
          "invalid assignment target",
          sourceName,
          target.getLineno(), "", 0);
      }
      return assign;
    }

}