Lexical binding at top of file

Lexical binding at top of file

[Heime]

To enable lexical binding in an elisp library, a line is put at the top of the file:

;; -*- lexical-binding: t -*-

Would the following also be good (three ;;; and the file name) ?  

;;; file.el -*- lexical-binding: t -*-

Any idea when it would it be possible not to need the declaration, as lexical binding
for library files would be implicit ?.

Re: Lexical binding at top of file

[Stefan Monnier via Users list for the GNU Emacs text editor]

> ;;; file.el -*- lexical-binding: t -*-
> Any idea when it would it be possible not to need the declaration,

Current best guess: Emacs-32 or Emacs-31?


        Stefan

Re: Lexical binding at top of file

[Heime]

On Sunday, July 7th, 2024 at 3:13 AM, Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> wrote:

> > ;;; file.el -- lexical-binding: t --
> > Any idea when it would it be possible not to need the declaration,
> 
> Current best guess: Emacs-32 or Emacs-31?
> 
> Stefan

Does the lexical-binding: t apply when there is an arbitrary number of
comment characters ? 

;;; file.el -*- lexical-binding: t -*-

Re: Lexical binding at top of file

[CToID]

On 2024-07-07 Sun 21:31 UTC+0800, Heime <heimeborgia@protonmail.com> said:

> Does the lexical-binding: t apply when there is an arbitrary number of
> comment characters ?
> 
> ;;; file.el -*- lexical-binding: t -*-
> 

This is the first line from `git-rebase.el` from magit.

;;; git-rebase.el --- Edit Git rebase files  -*- lexical-binding:t -*-

So one can probably have some characters in front of the actually var 
list.  Not sure if it's arbitrary tho.

-- 
Best,
ID

Re: Lexical binding at top of file

[Stefan Monnier via Users list for the GNU Emacs text editor]

> This is the first line from `git-rebase.el` from magit.
>
> ;;; git-rebase.el --- Edit Git rebase files  -*- lexical-binding:t -*-
>
> So one can probably have some characters in front of the actually var list.
> Not sure if it's arbitrary tho.

If it's not clearly documented in the ELisp manual (or you find it too
difficult to find), please report it as a bug.


        Stefan

Re: Lexical binding at top of file

[CToID]

On 2024-07-07 Sun 23:39 UTC+0800, Stefan Monnier via Users list for the 
GNU Emacs text editor <help-gnu-emacs@gnu.org> said:

> If it's not clearly documented in the ELisp manual (or you find it too
> difficult to find), please report it as a bug.

I don't see it mentioned anywhere in both Emacs and Elisp manual.  In 
Emacs manual, it only mentions that it can be placed on the second line 
of a shell script.  Elisp manual doesn't even mention how it should look 
like.

-- 
Best,
ID