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Re: How to tame compiler?
From: |
Jean Louis |
Subject: |
Re: How to tame compiler? |
Date: |
Sat, 1 May 2021 09:03:56 +0300 |
User-agent: |
Mutt/2.0.6 (2021-03-06) |
* Michael Heerdegen <michael_heerdegen@web.de> [2021-05-01 03:44]:
> Jean Louis <bugs@gnu.support> writes:
>
> > As I have recently implemented new function that use `eval' to expand
> > various variables and these variables are not visibly used in the
> > program, I would like to tame the compiler, as I get these warnings:
> >
> > In rcd-send-email:
> > rcd-mailing.el:225:62: Warning: Unused lexical variable `unsubscribe-url'
> > rcd-mailing.el:231:21: Warning: Unused lexical variable `hello-name'
> > rcd-mailing.el:234:72: Warning: Unused lexical variable `unsubscribe-text'
> > rcd-mailing.el:252:11: Warning: Unused lexical variable `body'
> >
> > What is happening here is that those variables are used but inside of
> > `eval' form which is expanded dynamically when program runs. Compiler
> > cannot see that.
> >
> > Is there a way to avoid these warnings?
>
> Independent from the question whether your usage of `eval' is good or
> valid - there must be some real problem here: if the compiler tells that
> the lexical variables are unused, their values will not be available in
> you `eval' call - you would have to create dynamical bindings for
> that.
How do I go to create dynamical bindings? Help me.
This file works:
(let* ((hello-name "Joe")
(template "⟦ hello-name ⟧")
(expanded (rcd-template-eval template)))
expanded) ⇒ "Joe"
while this one does not work:
;; -*- lexical-binding: t; -*-
(let* ((hello-name "Joe")
(template "⟦ hello-name ⟧")
(expanded (rcd-template-eval template)))
expanded) ⇒ ""
and to make it work I did this:
;; -*- lexical-binding: t; -*-
(let* ((hello-name "Joe")
(template "⟦ hello-name ⟧")
(lexical-binding nil)
(expanded (rcd-template-eval template)))
expanded)
(ignore 'hello-name)
however, that simple example does not work, but what is astonishing I
have sent 900+ emails yesterday and they were expanded just fine.
The file test.el with above code is not working.
My file with lexical-binding: t is working.
I am using it and I do not know why it does work.
Without (lexical-binding nil) it did not work. It seems I have to use
that to make it work, but in smallest example it does not.
Maybe it is something completely else.
--
Jean
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