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bug#27016: possible bug in `defsetf'


From: npostavs
Subject: bug#27016: possible bug in `defsetf'
Date: Mon, 22 May 2017 08:11:25 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux)

tags 27016 unreproducible
quit

Rafael D Sorkin <rsorkin@perimeterinstitute.ca> writes:

> emacs-version                         ; 24.5.1
> (setq pair (cons 3 4))                        ; (3 . 4)
> (foobar pair)                         ; Symbol's function definition is void: 
> foobar
> (setf (foobar pair) 0)                        ; (foobar pair) is not a valid 
> place expression 
> (unless t
>   (defalias 'foobar 'cons)
>   (defsetf foobar setcar))            ; nil 
> (foobar pair)                         ; same as above
> (setf (foobar pair) 0)                        ; 0       !
> pair                                  ; (0 . 4) !

I'm not able to reproduce this behaviour on 24.5, the second setf throws
an error just like the first.  How are you evaluating these exactly
(starting from emacs -Q)?  I tried C-x C-e on each sexp in turn.





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