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Re: [External] : Re: Lexical vs. dynamic: small examples?
From: |
Emanuel Berg |
Subject: |
Re: [External] : Re: Lexical vs. dynamic: small examples? |
Date: |
Thu, 26 Aug 2021 01:40:20 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
> So why does it "work" with no defvar, just `setq'?
Indeed, it works with just `setq', and no `defvar'!
Now the byte-compiler instead warns about a reference to
a free variable. Maybe it shouldn't do that and instead warn
when one uses `defvar'?
;;; -*- lexical-binding: t -*-
;;;
;;; this file:
;;; http://user.it.uu.se/~embe8573/emacs-init/geh.el
;;; https://dataswamp.org/~incal/emacs-init/geh.el
(defmacro slet (bindings &rest body)
(unless lexical-binding
(error "`slet' requires `lexical-binding' to be enabled") )
`(funcall
(lambda ,(mapcar #'car bindings)
,@body)
,@(mapcar #'cadr bindings) ))
(setq b 200)
(defun fun ()
b) ; geh.el:18:3: Warning: reference to free variable ‘b’
(slet ((b 1))
(list b (fun)) ) ; (1 200)
(let ((b 2))
(list b (fun))) ; (2 200)
--
underground experts united
https://dataswamp.org/~incal
- Re: [External] : Re: Lexical vs. dynamic: small examples?, (continued)
- RE: [External] : Re: Lexical vs. dynamic: small examples?, Drew Adams, 2021/08/15
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Arthur Miller, 2021/08/15
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Lars Ingebrigtsen, 2021/08/15
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/15
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Stefan Monnier, 2021/08/15
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/20
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Stefan Monnier, 2021/08/23
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/25
- Re: [External] : Re: Lexical vs. dynamic: small examples?,
Emanuel Berg <=
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/25
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/25
- FW: [External] : Re: Lexical vs. dynamic: small examples?, Drew Adams, 2021/08/26
- Re: FW: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/26
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/25
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Stefan Monnier, 2021/08/25
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/25
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/27
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/27
- Re: [External] : Re: Lexical vs. dynamic: small examples?, Emanuel Berg, 2021/08/15