Subject: bug#44229: 27.1; Can not set tabulated-list-format with variable

From: Lars Ingebrigtsen <[email-masked]>
Date: Mon, 26 Oct 2020 22:26:03 +0100

dalanicolai <[email-masked]> writes:

> (defvar col1-width 4)
> (defvar col2-width 10)
>
> (define-derived-mode tabular-bug-demo-mode
>   tabulated-list-mode "tab-bug"
>   "Major mode for Tab-bug."
>   (setq-local tabulated-list-format [("Col1" col1-width nil)
>                                      ("Col2" col2-width nil)])
>   (tabulated-list-init-header))

[] quotes whatever you feed it, so that's not a list with a string, a
number and nil, but a string, a symbol, and nil.

You probably want

`[("Col1" ,col1-width nil)
  ("Col2" ,col2-width nil)]

or use the functions `vector' and `list' instead of literals.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no