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Subject: |
24.3.50; A macro object does not necessarily have `lambda' as its cadr |
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Fri, 6 Sep 2013 22:39:58 -0700 (PDT) |
AFAICT, (elisp) `Defining Macros' is the closest thing we have to doc
telling you how to test whether a Lisp object is a macro. There is no
`macro-p' predicate or similar in Emacs Lisp, unless I'm missing
something. (Shouldn't there be?)
Anyway, this Elisp manual node says that a macro is a list whose car is
`macro' and whose `cdr' is a lambda expression. That's not true if the
`defmacro' was byte-compiled. The macro is then a list whose car is `macro'
but whose cdr is byte code, AFAICT. So this will not work, for example:
(defun macro-p (obj)
(and (fboundp obj)
(let ((def (symbol-function obj)))
(and (consp def)
(eq (car def) 'macro)
(eq (cadr def) 'lambda)))))
In GNU Emacs 24.3.50.1 (i686-pc-mingw32)
of 2013-08-23 on ODIEONE
Bzr revision: 113986 address@hidden
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
`configure --prefix=/c/Devel/emacs/binary --enable-checking=yes,glyphs
'CFLAGS=-O0 -g3' LDFLAGS=-Lc:/Devel/emacs/lib
CPPFLAGS=-Ic:/Devel/emacs/include'
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Subject: |
Re: bug#15296: 24.3.50; A macro object does not necessarily have `lambda' as its cadr |
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Date: |
Sun, 08 Sep 2013 14:01:53 -0400 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) |
> `macro' and whose `cdr' is a lambda expression. That's not true if the
I changed it to say "function" instead.
Stefan
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