Hi Ihor,

On 8/25/23 03:19, Ihor Radchenko wrote:

Debugger entered--Lisp error: (wrong-type-argument listp org-fold-outline)
   car(org-fold-outline)
   alist-get(org-fold-outline ((:alias . org-link) (org-link . org-link) 
(:alias . org-link-description) (org-link-description . org-link-description) 
(property-drawer . org-fold-drawer) (drawer . org-fold-drawer) (:alias . 
org-fold-drawer) (org-fold-drawer . org-fold-drawer) (verse-block . 
org-fold-block) (src-block . org-fold-block) (special-block . org-fold-block) 
(quote-block . org-fold-block) (export-block . org-fold-block) (example-block . 
org-fold-block) (dynamic-block . org-fold-block) (comment-block . 
org-fold-block) (center-block . org-fold-block) (block . org-fold-block) 
(:alias . org-fold-block) (org-fold-block . org-fold-block) (plain-list . 
org-fold-outline) (inlinetask . org-fold-outline) (outline . org-fold-outline) 
(heading . org-fold-outline) (headline . org-fold-outline) (:alias . 
org-fold-outline) (org-fold-outline . org-fold-outline)))
   org-fold-core-get-folding-spec-from-alias(org-fold-outline)
   org-fold-core--property-symbol-get-create(org-fold-outline)

This is a very strange backtrace.
When I run that `alist-get' call manually, there is no error. And
`alist-get' does not call `car'.

May you try to re-generate the backtrace again?

It is indeed strange. I generated the backtrace several times over several sessions before reporting. I also can reproduce it in a clean Emacs configuration like so:

Using with-emacs.sh on Emacs 29.1:

1.  Run "with-emacs.sh -i burly"
2.  "C-x C-f /tmp/test.org RET"
3.  Input a file like so:

  * Heading A
  ** Heading A1

4.  With point on Heading A1, "C-c C-x b".
5.  "M-x delete-other-windows RET" to show only the subtree buffer.
6.  "M-x burly-bookmark-windows RET", input name, save bookmark.
7.  Kill the file's buffer and delete-other-windows.
8.  "C-x r b" select bookmark that was created, and open it.
9.  You should get the error, and with debug-on-error, the backtrace.

This bug breaks burly's functionality to bookmark and restore subtree buffers, which worked fine before upgrading to Emacs 29.1.

Thanks,
Adam

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