I just updated org-mode using package.el and got release 9.5.3
Now I get an error in `org-at-timestamp-p` (OATP), which is invoked when
calling `org-agenda`.
I checked the repository and the problem is in commit 1f617727f1, which
added to this function the following code block:
```
- (let* ((regexp (if extended
- (if (eq extended 'agenda)
- org-element--timestamp-regexp
- org-ts-regexp3)
- org-ts-regexp2))
+ (let* ((regexp
+ (if extended
+ (if (eq extended 'agenda)
+ (rx (or (regexp org-ts-regexp3)
+ (regexp org-element--timestamp-regexp)))
+ org-ts-regexp3)
+ org-ts-regexp2))
```
The issue arises where OATP uses `rx` to process a regex stored in
`org-ts-regexp3`:
```
(rx (or (regexp org-ts-regexp3) ; here
(regexp org-element--timestamp-regexp)))
```
This fails because `rx-check` checks the sub-expression `(regexp
org-ts-regexp3)` to make sure that `org-ts-regexp3` is a string, but
`org-ts-regexp3` is not evaluated, and the *symbol* `org-ts-regexp3` is
not a string (it's a symbol), even though it's *value* is a string.
I'm not sure whether this is a bug in org-mode proper (I would have
thought this would be caught before release) or perhaps org-mode expects
some version of `rx.el` that I do not have. Unfortunately, I don't see
a version number in `rx.el`, only a copyright date.
I am running Emacs 25 (Aquamacs). So, maybe this code requires Emacs 26?
If so, it would be nice if org-mode 9.5.3 was tagged as incompatible
with Emacs 25? (It would also be nice if package mode supported
roll-back, but that's OT here!)
