private <T extends AST> void doFindAllNodes(AST node, Class<T> clazz, List<T> found) {
		do {
			if ( clazz.isAssignableFrom( node.getClass() ) ) {
				found.add( (T) node );
			}
			if ( node.getFirstChild() != null ) {
				doFindAllNodes( node.getFirstChild(), clazz, found );
			}
			node = node.getNextSibling();
		} while ( node != null );
	}