From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Thuna <thuna.cing@gmail.com>
Cc: help-gnu-emacs@gnu.org
Subject: Re: `eval'ing form in the current lexical environment
Date: Sun, 07 Jul 2024 22:49:41 -0400 [thread overview]
Message-ID: <jwvbk3861rz.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87y16c3acc.fsf@gmail.com> (Thuna's message of "Mon, 08 Jul 2024 04:07:31 +0200")
> All macros are expanded and processed, thus `(,head ,@args) above is
> /necessarily/ a function call... that is, unless it is later redefined
> as a macro.
I think this is the part I don't understand: why do you worry about
`head` being a function (or undefined) during macro-expansion but
a macro at run-time?
If the code is compiled, such a change leads to an error and we blame
the change, not the compiler.
E.g. M-: (disassemble '(lambda () (foobar 5))) RET
turns into the byte-code:
byte code:
args: nil
0 constant foobar
1 constant 5
2 call 1
3 return
and this `call` just signals an error if `foobar` is not a function at
run-time.
So, I think what I'm saying is that you should probably not try to
handle this case at all.
Stefan
next prev parent reply other threads:[~2024-07-08 2:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-07 18:55 `eval'ing form in the current lexical environment Thuna
2024-07-07 19:16 ` Stefan Monnier via Users list for the GNU Emacs text editor
2024-07-08 2:07 ` Thuna
2024-07-08 2:49 ` Stefan Monnier [this message]
2024-07-08 21:38 ` Thuna
2024-07-08 22:03 ` Stefan Monnier
2024-07-08 22:42 ` Thuna
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