bug#61962: 30.0.50; New trouble with symbols with positions

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 7 Mar 2023 10:24:41 +0000
> Cc: Mattias Engdegård <mattiase@acm.org>,
>   Eli Zaretskii <eliz@gnu.org>, 61962-done@debbugs.gnu.org
> From: Alan Mackenzie <acm@muc.de>
> 
> I've now written safe-copy-tree, and committed it together with the fix
> in bytecomp.el to master.

Next time when you post a patch and ask for comments, please allow
some time for responses, including to those who might be in different
time zones or have less free time on their hands.  13 hours you waited
is definitely not enough.

Btw, what are these "NEW STOUGH" markers you added to bytecomp.el:

+;;;; NEW STOUGH, 2023-03-05
+                    (byte-run-strip-symbol-positions
+;;;; END OF NEW STOUGH
                    (byte-compile-sexp
                      (let ((form (read-positioning-symbols (current-buffer))))
                        (push form byte-compile-form-stack)
                        (eval-sexp-add-defvars
                         form
-                        start-read-position))))
+                        start-read-position)))
+;;;; NEW STOUGH, 2023-03-05
+                    )
+;;;; END OF NEW STOUGH
+                                              )

Also, how about adding some tests, to make sure we don't regress in
this area in the future?