Printing 如何评估缓冲区并将所有内容打印到另一个缓冲区？

我在这上面搜索了几个小时，我已经放弃了。也许你能帮忙

我所要做的就是在缓冲区中计算LISP并查看打印的所有内容。例如：

(setq NUMBERS (list 1 2 3))
(add-to-list 'NUMBERS 4 t)
(print NUMBERS)

所以我做了M-x评估缓冲区，我没有看到打印的数字。（使用M-x M-e时不会发生这种情况，但我不想对每一行都这样做，也不想每次都标记区域。我只想计算整个缓冲区）。我查阅了eval buffer的描述，发现有一个用于打印的参数，但我不能给它任何值，因为我不知道在那里实际键入什么。也许是“打印”吧？但是（通用参数）只提供数值，所以我迷路了

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基本问题：如何评估整个缓冲区并实际查看打印的内容？

这使输出显示在Emacs 27.1中的回显区域中：

(print NUMBERS t)

尽管文件上说：

Optional argument PRINTCHARFUN is the output stream, which can be one
of these:

   - a buffer, in which case output is inserted into that buffer at point;
   - a marker, in which case output is inserted at marker’s position;
   - a function, in which case that function is called once for each
     character of OBJECT’s printed representation;
   - a symbol, in which case that symbol’s function definition is called; or
   - t, in which case the output is displayed in the echo area.

If PRINTCHARFUN is omitted, the value of ‘standard-output’ (which see)
is used instead.

标准输出是：

Its value is t