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RE: Can't M-x compile-defun `edebug' because dynamic variables are false
From: |
Drew Adams |
Subject: |
RE: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical. |
Date: |
Thu, 13 Feb 2020 12:43:29 -0800 (PST) |
> > Can we please fix the doc, to make things clear?
>
> I added:
>
> Note that since this is a function, it can only return
> non-@code{nil} for variables which are permanently special, but not
> for those that are only special in the current lexical scope.
Thanks very much for working on this.
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.
I looked in Elisp nodes `Using Lexical Binding',
where `special-variable-p' is documented, and
`Defining Variables', where `defvar' is doc'd.
"special" variable seems to be defined as a term
in each of those nodes, BTW. (I also looked in
node `Variable Scoping'.)
Node `Defining Variables' seems to say that using
`defvar' is enough to make a variable "always"
dynamic:
The variable is marked as "special", meaning
that it should always be dynamically bound
^^^^^^
(*note Variable Scoping::).
Is "always" something different from "permanent"?
Sorry, but I really don't understand what is meant
by what you wrote. I also don't understand the
implication, "since this is a function".
^^^^^
But maybe that's because I don't understand
"permanently special" and "only special in the
current lexical scope".
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?)
- RE: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical., Drew Adams, 2020/02/13
- Re: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical., Stefan Monnier, 2020/02/13
- RE: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical.,
Drew Adams <=
- Re: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical., Stefan Monnier, 2020/02/13
- RE: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical., Drew Adams, 2020/02/13
- Re: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical., Stefan Monnier, 2020/02/13
- RE: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical., Drew Adams, 2020/02/14
- Re: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical., Stefan Monnier, 2020/02/14
- RE: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical., Drew Adams, 2020/02/17
- Re: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical., Stefan Monnier, 2020/02/13
- RE: Can't M-x compile-defun `edebug' because dynamic variables are falsely taken as lexical., Drew Adams, 2020/02/13