Hi Ihor,

On 8/28/23 04:24, Ihor Radchenko wrote:
Adam Porter <a...@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.

My apologies, I overlooked that when investigating the problem. Thanks for your work.

Adam

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