private boolean checkJikesSuper(Expression expr) {
		if (expr instanceof LocalStoreOperator || expr instanceof IIncOperator)
			return false;
		if (expr instanceof Operator) {
			Expression subExpr[] = ((Operator) expr).getSubExpressions();
			for (int i = 0; i < subExpr.length; i++) {
				if (!checkJikesSuper(subExpr[i]))
					return false;
			}
		}
		return true;
	}