Review

class UnfoldCompoundAssignments {
  /**
   * Unfolds a compound assignment node {@code lhs op= rhs} to {@code lhs = lhs
   * op rhs}.
   *
   * @param node a compound assignment node
   */
  private void unfoldCompoundAssignment(Node node) {
    Node lhs = node.getFirstChild();
    Preconditions.checkArgument(!NodeUtil.mayHaveSideEffects(lhs),
        "Cannot unfold compound assignment if LHS can have side effects");
    Node newRhs = node.cloneTree();
    newRhs.setType(NodeUtil.getOpFromAssignmentOp(node));
    node.replaceChildAfter(lhs, newRhs);
    node.setType(Token.ASSIGN);
    compiler.reportCodeChange();
  }

}