Re: [BUG] When calling org-tree-to-indirect-buffer: (wrong-type-argument listp org-fold-outline) in org-fold-core-get-folding-spec-from-alias [9.6.6 (release_9.6.6 @ /gnu/store/c7vqk20kf6zw73klr8bacnh0gqahk5dd-emacs-29.1-29.1/share/emacs/29.1/lisp/org/)]

[Ihor Radchenko <yantar92@posteo.net>]

Adam Porter <adam@alphapapa.net> writes:

>> 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:

You re-define `alist-get' in one of the callers in a way that cannot
handle normal alists like (key . value), not (key . list-value).

(cl-defun burly-follow-url-org-mode (&key buffer query)
  "In BUFFER, jump to heading and position from QUERY, and return a buffer.
If QUERY specifies that the buffer should be indirect, a new,
indirect buffer is returned.  Otherwise BUFFER is returned."
  ;; `pcase's map support uses `alist-get', which does not work with string keys
  ;; unless its TESTFN arg is bound to, e.g. `equal', but `map-elt' has deprecated
  ;; its TESTFN arg, and there's no way to pass it or bind it when using `pcase'
  ;; anyway.  So we rebind `alist-get' to a function that uses `assoc-string'.
  (with-current-buffer buffer
    (cl-letf (((symbol-function 'alist-get)
               (lambda (key alist &optional _default _remove _testfn)
                 ;; Only the first value in the list of values is returned, so multiple
                 ;; values are not supported.  I don't expect this to be a problem...
                 (cadr (assoc-string key alist)))))

Handled.
Not an Org bug.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
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