bug#62583: Guile 3.0.9 crashes when calling set-car! on the last node of '(...)

[Rui Zhang]

Reproduction:

    (let ((xs '(1)))
      (set-car! xs 0))

or

    (let ((xs '(1 2)))
      (set-car! (cdr xs) 0))

Guile will segfault executing this code, and only when set-car! is called on 
the last node.  I believe the expectation is that it does not segfault and xs 
will be modified to (0) or (1 0) in these two examples.

If I use (list 1) instead of '(1), Guile does not seem to segfault.  Maybe '(1) 
is constructed differently?


$ guile --version
guile (GNU Guile) 3.0.9
Copyright (C) 2023 Free Software Foundation, Inc.

License LGPLv3+: GNU LGPL 3 or later <http://gnu.org/licenses/lgpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

$ ./config.guess
x86_64-pc-linux-gnu


Best regards,
-Rui