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Re: Why "symbol's value" error about a list?
From: |
Alan Mackenzie |
Subject: |
Re: Why "symbol's value" error about a list? |
Date: |
Mon, 5 Feb 2018 20:35:44 +0000 |
User-agent: |
Mutt/1.7.2 (2016-11-26) |
Hello, Richard.
On Sun, Feb 04, 2018 at 20:06:39 -0500, Richard Stallman wrote:
> [[[ To any NSA and FBI agents reading my email: please consider ]]]
> [[[ whether defending the US Constitution against all enemies, ]]]
> [[[ foreign or domestic, requires you to follow Snowden's example. ]]]
> > For example, suppose you have a Lisp program that produces the
> > following error message when compiled/executed:
> > Symbol's value as variable is void: 'аbbrevs-changed
> Does that error message really happen? If so, how can I reproduce it?
In Emacs-25.3 -Q, do
M-: (message "(setq foo 'bar)") RET
, followed by getting the output from *Messages* into the kill ring with
M-w, followed by
M-: C-y RET
. You might think you are executing (setq foo 'bar). You're not.
You're executing (setq foo ’bar), where the ’ is a Unicode curly quote.
The error message given out is:
Symbol's value as variable is void: ’bar
. If you're like me, you will read that as the symbol "bar" is void,
rather than the symbol "’bar" is void.
This is a result of the change in `message', silently to convert ' to a
curly quote, by default. Some of us were unhappy at this change and
protested against it.
> I understand that the character 'а' is not ASCII a. That explains why
> 'аbbrevs-changed' is not known as a variable. But I'm talking about
> a different issue, which has nothing to do with character coding.
> Suppose it were 'foobaz', all ASCII, and we got an error such as
> > Symbol's value as variable is void: 'foobaz
> That still seems wrong.
Again "’foobaz", not "foobaz" is the symbol, here.
> If the error was that foobaz was void, the error message should not
> include a quote. It should say
> > Symbol's value as variable is void: foobaz
Yes.
> Or if the error was that 'foobaz is used instead of a symbol, the error
> message should say
> > Wrong type argument: symbolp, (quote foobaz)
In the recent pretest, Emacs-26.0.91, when a curly quote appears at the
start of a symbol, the reader rejects it, giving the error message:
read--expression: Invalid read syntax: "strange quote", "'"
. This is somewhat controversional, and is what the recent discussion
has been about.
> --
> Dr Richard Stallman
> President, Free Software Foundation (https://gnu.org, https://fsf.org)
> Internet Hall-of-Famer (https://internethalloffame.org)
> Skype: No way! See https://stallman.org/skype.html.
--
Alan Mackenzie (Nuremberg, Germany).
- Re: Change of Lisp syntax for "fancy" quotes in Emacs 27?, (continued)
- Re: Change of Lisp syntax for "fancy" quotes in Emacs 27?, Alan Mackenzie, 2018/02/04
- RE: Change of Lisp syntax for "fancy" quotes in Emacs 27?, Drew Adams, 2018/02/04
- Re: Change of Lisp syntax for "fancy" quotes in Emacs 27?, Noam Postavsky, 2018/02/04
- RE: Change of Lisp syntax for "fancy" quotes in Emacs 27?, Drew Adams, 2018/02/03
- Re: Change of Lisp syntax for "fancy" quotes in Emacs 27?, Noam Postavsky, 2018/02/03
- Re: Change of Lisp syntax for "fancy" quotes in Emacs 27?, Richard Stallman, 2018/02/04
- Why "symbol's value" error about a list?, Richard Stallman, 2018/02/04
- Re: Why "symbol's value" error about a list?,
Alan Mackenzie <=
- RE: Why "symbol's value" error about a list?, Drew Adams, 2018/02/05
- Re: Why "symbol's value" error about a list?, Eli Zaretskii, 2018/02/05
- Re: Why "symbol's value" error about a list?, Tim Cross, 2018/02/06
- Re: Why "symbol's value" error about a list?, Eli Zaretskii, 2018/02/06
- RE: Why "symbol's value" error about a list?, Drew Adams, 2018/02/06
- RE: Why "symbol's value" error about a list?, Drew Adams, 2018/02/06
- Re: Why "symbol's value" error about a list?, Eli Zaretskii, 2018/02/06
- Re: Why "symbol's value" error about a list?, Richard Stallman, 2018/02/06
- Re: Why "symbol's value" error about a list?, Noam Postavsky, 2018/02/06
- Re: Why "symbol's value" error about a list?, Richard Stallman, 2018/02/06