From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Drew Adams <drew.adams@oracle.com>
Cc: Alan Mackenzie <acm@muc.de>, emacs-devel@gnu.org
Subject: Re: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical.
Date: Thu, 13 Feb 2020 17:09:46 -0500 [thread overview]
Message-ID: <jwv36benntq.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <256f068f-5a0a-4127-aa7c-633eae24f15f@default> (Drew Adams's message of "Thu, 13 Feb 2020 12:43:29 -0800 (PST)")
> But I'm afraid I don't know what a permanent versus
> temporary special variable is.
> And I haven't found
> anything in the doc that has helped me with that.
It's the term used in the part that describes `defvar`:
Note that specifying a value, even @code{nil}, marks the variable as
special permanently. Whereas if @var{value} is omitted then the
variable is only marked special locally (i.e.@: within the current
lexical scope, or file if at the top-level). This can be useful for
suppressing byte compilation warnings, see @ref{Compiler Errors}.
> AFAIK, in Common Lisp a variable is either special
> or it's not. If it is then its binding by `let'
> is dynamic, and if it's not then its let-binding
> is lexical. (No?)
Same for us.
Does Common Lisp offer something like `special-variable-p`?
Stefan
next prev parent reply other threads:[~2020-02-13 22:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-03 14:14 Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical Alan Mackenzie
2017-01-03 18:35 ` Stefan Monnier
2017-01-03 21:32 ` Alan Mackenzie
2017-01-03 21:48 ` Stefan Monnier
2017-01-04 13:39 ` Alan Mackenzie
2017-01-04 15:23 ` Stefan Monnier
2017-01-04 20:04 ` Alan Mackenzie
2017-01-04 21:49 ` Stefan Monnier
2017-01-04 22:02 ` Alan Mackenzie
2017-01-04 22:26 ` Stefan Monnier
2017-01-04 22:44 ` Drew Adams
2017-01-05 10:54 ` Alan Mackenzie
2020-02-13 16:42 ` Drew Adams
2020-02-13 20:02 ` Stefan Monnier
2020-02-13 20:43 ` Drew Adams
2020-02-13 22:09 ` Stefan Monnier [this message]
2020-02-14 1:07 ` Drew Adams
2020-02-14 2:24 ` Stefan Monnier
2020-02-14 17:25 ` Drew Adams
2020-02-14 19:19 ` Stefan Monnier
2020-02-17 18:23 ` Drew Adams
2020-02-13 22:11 ` Stefan Monnier
2020-02-14 1:13 ` Drew Adams
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