:var 传入 Table 变量不起作用?

读到这样一段代码 https://orgmode.org/org.html#Environment-of-a-Code-Block

  • table

    A table named with a ‘NAME’ keyword.

#+NAME: example-table 
| 1 | 
| 2 | 
| 3 | 
| 4 | 

#+NAME: table-length 
#+BEGIN_SRC emacs-lisp :var table=example-table   
(length table) 
#+END_SRC
#+RESULTS: table-length
:4

C-c C-c执行, 按照文档应该在result中显示 :4

我执行后, 却将结果显示echo area中 “4” #+RESULTS不起作用.

org-example-pass-table-to-var