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Re: [External] : Re: Lexical vs. dynamic: small examples?
From: |
Stefan Monnier |
Subject: |
Re: [External] : Re: Lexical vs. dynamic: small examples? |
Date: |
Sun, 15 Aug 2021 18:44:42 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Emanuel Berg via Users list for the GNU Emacs text editor [2021-08-16 00:22:43]
wrote:
> Lars Ingebrigtsen wrote:
>>> So the proposal/question is, instead one could have `let'
>>> _always_ be lexical, and one "with-variables-as" which
>>> would be what is now called "dynamic binding" with let.
>> These are `lexical-let' and `dlet' (in Emacs 28).
> Ha! Now you are telling...
Note that `lexical-let` is an old thing of the deprecated `cl.el`
library which let you have static scoping let-bindings before
`lexical-binding` existed.
When `lexical-binding` is not enabled it's still currently the only way
I know to get a statically scoped let-binding, but when
`lexical-binding` is enabled you can use:
(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)))
instead,
Stefan
- 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?, Emanuel Berg, 2021/08/15
- RE: [External] : Re: Lexical vs. dynamic: small examples?, Drew Adams, 2021/08/15
- 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 <=
- 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, 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, 2021/08/25
- 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