GNU bug report logs - #3647
23.1.50; defun* generates incorrect code for handling arglist keyword lookup

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Miles Bader <miles.bader <at> necel.com>
To: emacs-pretest-bug <at> gnu.org
Subject: 23.1.50; defun* generates incorrect code for handling arglist keyword lookup
Date: Mon, 22 Jun 2009 15:45:29 +0900

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:


Given the following code:

   (require 'cl)
   (defun* oink (&key a b) (list a b))

then evaluating:

   (oink :b :a :a 42)
   => (:a :a)

... which is incorrect.  The correct answer is (42 :A).

Looking at the macro-expansion of the above defun* form, the reason is
obvious:  the generated code uses (car (cdr (memq KEYWORD ARGLIST))) to
look up keyword argument values, which is obviously bogus if a preceding
argument value is the same as a keyword.  It would be more correct to
use (plist-get ARGUMENT KEYWORD), and that's what common-lisp systems I
tested return for this test.

However, the code in cl.el that generates keyword handling code is so
confusing, I'm not really sure how to fix this; presumably something in
`cl-do-arglist'?

Thanks,

-Miles


If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/local/share/emacs/23.1.50/etc/DEBUG for instructions.


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