throw new UnsupportedOperationException("visitListOfExpressions");
    }

    // remaining methods are here to make sure we didn't forget anything

    @Override
    public void visitBreakStatement(BreakStatement stat) {
    }

    @Override
    public void visitContinueStatement(ContinueStatement stat) {
    }

    @Override
    public void visitConstantExpression(ConstantExpression expr) {