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  [The "BSD license"]
  Copyright (c) 2005-2009 Terence Parr
  All rights reserved.
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
 2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
 3. The name of the author may not be used to endorse or promote products
     derived from this software without specific prior written permission.
package org.antlr.runtime.tree;
	public RewriteRuleTokenStream(TreeAdaptor adaptorString elementDescription) {

Create a stream with one element
								  String elementDescription,
								  Object oneElement)

Create a stream, but feed off an existing list
								  String elementDescription,
								  List elements)

Get next token from stream and make a node for it
	public Object nextNode() {
		Token t = (Token)_next();
		return .create(t);
	public Token nextToken() {
		return (Token)_next();

Don't convert to a tree unless they explicitly call nextTree. This way we can do hetero tree nodes in rewrite.
	protected Object toTree(Object el) {
		return el;
	protected Object dup(Object el) {
		throw new UnsupportedOperationException("dup can't be called for a token stream.");
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