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* bug#31718: 26.1; Strange behavior of `cond'
@ 2018-06-05  6:26 Ikumi Keita
  2018-06-05  8:07 ` Andreas Schwab
  2018-06-16 15:10 ` Paul Eggert
  0 siblings, 2 replies; 18+ messages in thread
From: Ikumi Keita @ 2018-06-05  6:26 UTC (permalink / raw)
  To: 31718

The special form `cond' does not return expected value under a specific
condition.

[How to reproduce]
1. Save the following file as /tmp/test.el
---- test.el ---------------------------------------------------------
(defun xyz (arg)
  "dummy"
;    (cond ((eq arg nil) ; OK
;    (cond ((eq arg 'abc) ; OK
;    (cond ((eq arg 'def) ; OK
    (cond ((eq arg 'default) ; NG
;    (cond ((eq arg 'default1) ; OK
	   "A")
	  (t
	   "B")))

(byte-compile 'xyz)

(insert (xyz t)) ; should "B", but "A" in actual
----------------------------------------------------------------------
2. emacs-26.1 -Q -l /tmp/test.el
3. Expected result:
   "B" is inserted in *scratch*
   Actual result:
   "A" is inserted in *scratch*

[Some notes related to this issue]
a. As the comments written in the above code, only the symbol `default'
   triggers this behavior.
b. Emacs 25.3 doesn't have this problem.
c. If `xyz' is not byte compiled, `cond' works as expected.
d. It seems that the following entry in NEWS is related:
** Certain cond/pcase/cl-case forms are now compiled using a faster jump
table implementation.  This uses a new bytecode op 'switch', which
isn't compatible with previous Emacs versions.  This functionality can
be disabled by setting 'byte-compile-cond-use-jump-table' to nil.
   If I replace the line `(byte-compile 'xyz)' with
(let ((byte-compile-cond-use-jump-table nil))
  (byte-compile 'xyz))
   in the above example, `cond' works as expected.


In GNU Emacs 26.1 (build 1, x86_64-unknown-freebsd11.1, GTK+ Version 3.22.29)
 of 2018-05-30 built on freebsd.vmware
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
Recent messages:
Saving file /home/keita/Mail/drafts/1...
Wrote /home/keita/Mail/drafts/1
next-line: End of buffer [2 times]
Saving file /home/keita/Mail/drafts/1...
Wrote /home/keita/Mail/drafts/1
next-line: End of buffer [4 times]
Sending...backgrounded
Scanning +drafts...done
No messages in +drafts, range (all)
Quit [2 times]
user-error: No cross-references in this node
Configured using:
 'configure --with-canna --with-canna-includes=/usr/local/canna/include
--with-canna-libraries=/usr/local/canna/lib --mandir=/usr/local/man
--without-xim --with-sound=yes --with-file-notification=yes
--disable-largefile --without-pop CFLAGS=-O3'

Configured features:
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LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LCMS2

Important settings:
  value of $EMACSLOADPATH: /home/keita/elisp:
  value of $LANG: ja_JP.eucJP
  value of $XMODIFIERS: @im=fcitx
  locale-coding-system: japanese-iso-8bit-unix

Major mode: Info

Minor modes in effect:
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Load-path shadows:
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~/elisp/tex-buf hides /usr/local/share/emacs/site-lisp/auctex/tex-buf
~/elisp/tex hides /usr/local/share/emacs/site-lisp/auctex/tex
~/elisp/reftex-parse hides /usr/local/share/emacs/26.1/lisp/textmodes/reftex-parse

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backquote dbusbind kqueue lcms2 dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 585780 62716)
 (symbols 48 43330 1)
 (miscs 40 1448 1041)
 (strings 32 118129 14954)
 (string-bytes 1 4152041)
 (vectors 16 71953)
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 (intervals 56 6509 2189)
 (buffers 992 42))





^ permalink raw reply	[flat|nested] 18+ messages in thread

end of thread, other threads:[~2018-06-17  4:44 UTC | newest]

Thread overview: 18+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2018-06-05  6:26 bug#31718: 26.1; Strange behavior of `cond' Ikumi Keita
2018-06-05  8:07 ` Andreas Schwab
2018-06-06  5:41   ` Ikumi Keita
2018-06-06  7:41     ` Robert Cochran
2018-06-06  9:14       ` Ikumi Keita
2018-06-12  1:34         ` Robert Cochran
2018-06-12 22:22           ` Noam Postavsky
2018-06-13  5:51             ` Ikumi Keita
2018-06-13  6:26               ` Vibhav Pant
2018-06-16 15:10 ` Paul Eggert
2018-06-16 15:20   ` Eli Zaretskii
2018-06-16 15:28     ` Paul Eggert
2018-06-16 16:02       ` Eli Zaretskii
2018-06-16 16:45         ` Paul Eggert
2018-06-16 15:23   ` Noam Postavsky
2018-06-16 15:30     ` Paul Eggert
2018-06-16 23:00       ` Drew Adams
2018-06-17  4:44   ` Michael Heerdegen

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