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* bug#25166: 26.0.50; It shouldn't be possible to set the function cell of nil and t
@ 2016-12-11  9:41 Philipp
  2016-12-11 18:38 ` Glenn Morris
  0 siblings, 1 reply; 15+ messages in thread
From: Philipp @ 2016-12-11  9:41 UTC (permalink / raw)
  To: 25166


You can set the function cell of nil and t using `fset' and friends.
But you can't call the `nil' function using (nil) (it does work with
(t)).  I think that attempting to set the function cell of nil and t is
almost always a bug -- probably the programmer wanted to set a real
symbol, but some of the constants got passed.  I propose to signal an
error (e.g. `setting-constant') whenever the function cell of nil and t
is modified; maybe the same should happen for keywords.


In GNU Emacs 26.0.50.5 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2016-12-10 built on localhost
Repository revision: dc62ea38e36b5de47893a60a76d66b7a79bf6437
Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
System Description:	Ubuntu 14.04 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --enable-checking --enable-check-lisp-object-type
 'CFLAGS=-O0 -ggdb3''

Configured features:
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TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
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  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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format env code-pages mule custom widget hashtable-print-readable
backquote inotify dynamic-setting system-font-setting
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Memory information:
((conses 16 97085 5586)
 (symbols 48 20041 0)
 (miscs 40 331 105)
 (strings 32 17859 3593)
 (string-bytes 1 580498)
 (vectors 16 13985)
 (vector-slots 8 448755 7198)
 (floats 8 179 25)
 (intervals 56 201 0)
 (buffers 976 11)
 (heap 1024 47360 1053))





^ permalink raw reply	[flat|nested] 15+ messages in thread

end of thread, other threads:[~2017-10-29 18:10 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-12-11  9:41 bug#25166: 26.0.50; It shouldn't be possible to set the function cell of nil and t Philipp
2016-12-11 18:38 ` Glenn Morris
2016-12-12 20:25   ` Glenn Morris
2016-12-26 19:29     ` Philipp Stephani
2016-12-26 19:41       ` Philipp Stephani
2016-12-26 19:47       ` Eli Zaretskii
2016-12-27 15:15         ` Stefan Monnier
2016-12-27 22:49           ` Eli Zaretskii
2016-12-27 23:11             ` Stefan Monnier
2017-05-01 14:44               ` Philipp Stephani
2017-05-01 15:12                 ` Eli Zaretskii
2017-10-27 17:59                   ` Noam Postavsky
2017-10-28 16:16                     ` Stefan Monnier
2017-10-28 16:45                       ` Noam Postavsky
2017-10-29 18:10                         ` Stefan Monnier

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