[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#18059: 24.3.92; defvar and special variables
From: |
Noam Postavsky |
Subject: |
bug#18059: 24.3.92; defvar and special variables |
Date: |
Tue, 13 Feb 2018 19:27:43 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux) |
Noam Postavsky <npostavs@users.sourceforge.net> writes:
> Stefan Monnier <monnier@IRO.UMontreal.CA> writes:
>
>>> I noticed doing (let () (defvar x)) seems to be the same as (progn
>>> (defvar x)), which may be a bug.
>>
>> Both interpretations would make sense, so given the lack of
>> documentation about the intention, we could consider it as a feature as
>> much as a bug.
>>
>> Have you checked whether the behavior is the same with the
>> byte-compiler?
>
> Yes, it's the same.
It's the same when let-binding a lexical variable, but not when binding
a dynamic one.
;; -*- lexical-binding: t -*-
(defvar foo-dynamic 'foo)
(let ((foo-dynamic 99))
(defvar x))
(let ((x 1))
(setq testfun (lambda () x)))
(message "%S" (funcall testfun))
gives
Symbol’s value as variable is void: x
when running the interpreted version, and
1
when running the compiled version.
- bug#18059: 24.3.92; defvar and special variables, (continued)
- bug#18059: 24.3.92; defvar and special variables, Michael Heerdegen, 2018/02/10
- bug#18059: 24.3.92; defvar and special variables, Drew Adams, 2018/02/10
- bug#18059: 24.3.92; defvar and special variables, Noam Postavsky, 2018/02/10
- bug#18059: 24.3.92; defvar and special variables, Stefan Monnier, 2018/02/11
- bug#18059: 24.3.92; defvar and special variables, Noam Postavsky, 2018/02/11
- bug#18059: 24.3.92; defvar and special variables, Michael Heerdegen, 2018/02/11
- bug#18059: 24.3.92; defvar and special variables, Noam Postavsky, 2018/02/11
- bug#18059: 24.3.92; defvar and special variables,
Noam Postavsky <=
- bug#18059: 24.3.92; defvar and special variables, Noam Postavsky, 2018/02/18
- bug#18059: 24.3.92; defvar and special variables, Michael Heerdegen, 2018/02/18
- bug#18059: 24.3.92; defvar and special variables, Noam Postavsky, 2018/02/21
- bug#18059: 24.3.92; defvar and special variables, Drew Adams, 2018/02/21
- bug#18059: 24.3.92; defvar and special variables, Noam Postavsky, 2018/02/21
- bug#18059: 24.3.92; defvar and special variables, Noam Postavsky, 2018/02/21
- bug#18059: 24.3.92; defvar and special variables, Drew Adams, 2018/02/21
- bug#18059: 24.3.92; defvar and special variables, Noam Postavsky, 2018/02/21
- bug#18059: 24.3.92; defvar and special variables, Drew Adams, 2018/02/21
- bug#18059: 24.3.92; defvar and special variables, Stefan Monnier, 2018/02/21