gistfile1.java

final boolean[] ok = new boolean[]{true};
final int[] returnCount = new int[]{0};
NodeTraversal.traverse(compiler, block, new AbstractShallowCallback() {
  @Override
  public void visit(NodeTraversal t, Node n, Node parent) {
    if (n.isName() && "arguments".equals(n.getString())) {
      ok[0] = false;
    }
    if(n.isReturn()) {
      returnCount[0]++;
    }
    // Look for eval or just let people shoot themselves in the foot?
  }
});