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* bug#24913: 25.1.50; Emacs accepts undocumented and confusing combinations of &optional and &rest in argument lists
@ 2016-11-09 21:17 Philipp Stephani
  2016-11-10 12:58 ` Philipp Stephani
  0 siblings, 1 reply; 8+ messages in thread
From: Philipp Stephani @ 2016-11-09 21:17 UTC (permalink / raw)
  To: 24913


For example:

(funcall (lambda (&optional &rest &rest &optional x) (list x)) 'a)
=> ((a))

Obviously here the &rest keyword "wins", but I think that's overly
confusing.  Such an argument list is most likely a programmer mistake,
and should signal an error to make the programmer aware of the mistake.



In GNU Emacs 25.1.50.13 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2016-11-09 built on localhost
Repository revision: eb364fddec1431f459166cebb36f09f6b371dd71
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

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

Configured features:
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TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

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

Major mode: Lisp Interaction

Minor modes in effect:
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  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
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Recent messages:
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Features:
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Memory information:
((conses 16 88939 12159)
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 (vectors 16 12779)
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 (floats 8 166 60)
 (intervals 56 209 0)
 (buffers 976 24)
 (heap 1024 23753 956))

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^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2016-11-20 12:41 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-11-09 21:17 bug#24913: 25.1.50; Emacs accepts undocumented and confusing combinations of &optional and &rest in argument lists Philipp Stephani
2016-11-10 12:58 ` Philipp Stephani
2016-11-10 16:56   ` Gemini Lasswell
2016-11-19 16:40     ` Philipp Stephani
2016-11-20  6:31       ` Gemini Lasswell
2016-11-20 12:41         ` Philipp Stephani
2016-11-18  9:06   ` Eli Zaretskii
2016-11-18 17:37     ` Philipp Stephani

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