lexical-let void function

lexical-let void function

[GNU Hacker]

I find `lexical-let' func in a old emacs script, but it is a void
function in my emacs version 28.0.92

maybe require it any emacs package?

Re: lexical-let void function

[Óscar Fuentes]

GNU Hacker <project@gnuhacker.org> writes:

> I find `lexical-let' func in a old emacs script, but it is a void
> function in my emacs version 28.0.92
>
> maybe require it any emacs package?

(require 'cl)

Emacs now provides "native" lexical binding. See the "Lexical binding"
node in the Elisp manual.

Re: lexical-let void function

[Emanuel Berg via Users list for the GNU Emacs text editor]

Óscar Fuentes wrote:

>> maybe require it any emacs package?
>
> (require 'cl)

But that's deprecated and it isn't in `cl-lib' ...

See? I told you ...

> Emacs now provides "native" lexical binding

Sure, but the CL extentions are in Elisp as well and they are
shipped with vanilla Emacs. (Just saying, I agree it's much
better LOL.)

> See the "Lexical binding" node in the Elisp manual.

:)

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Re: lexical-let void function

[GNU Hacker]

Óscar Fuentes <ofv@wanadoo.es> writes:
> GNU Hacker <project@gnuhacker.org> writes:

>> I find `lexical-let' func in a old emacs script, but it is a void
>> function in my emacs version 28.0.92

>> maybe require it any emacs package?

> (require 'cl)

> Emacs now provides "native" lexical binding. See the "Lexical binding"
> node in the Elisp manual.

Package cl is deprecated in emacs 28.0.92

I fixed it adding

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

to the first line

Just do

M-x elisp-enable-lexical-binding

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Re: lexical-let void function

[Emanuel Berg via Users list for the GNU Emacs text editor]

GNU Hacker wrote:

> I fixed it adding
>
>  -*- lexical-binding: t; -*-
>
> to the first line

Not adding 

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

in Joe Sixpack Elisp is considered a bug today, even.

And I guess I agree since I always thought such a cookie is
a poor man's solution! Badnesses: not the Lisp syntax,
a misuse of comment notation, reminds me of the
C preprocessor, etc ...

Sorry to repeat this like a paleo-parrot on Terra Prima, but
give us explicit code i.e. dlet/llet/slet ...

(Where `let' would be an alias to `llet', or the other way
around perhaps.)

> Just do
>
> M-x elisp-enable-lexical-binding

Fragile.

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Re: lexical-let void function

[Emanuel Berg via Users list for the GNU Emacs text editor]

GNU Hacker wrote:

> I fixed it adding
>
>  -*- lexical-binding: t; -*-
>
> to the first line

Now fix all the rest:

$ grep -L lexical-binding **/*.el

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Re: lexical-let void function

[Emanuel Berg via Users list for the GNU Emacs text editor]

GNU Hacker wrote:

> I find `lexical-let' func in a old emacs script, but it is
> a void function in my emacs version 28.0.92
>
> maybe require it any emacs package?

My intuition tells me to avoid using that ...

Use

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

topmost and then just `let' even tho it's ugly.

Something's up with `lexical-let' ... but don't know what?

But as for what it is, it is

  lexical-let is a Lisp macro in ‘cl.el’.

  (lexical-let BINDINGS BODY)

  Like ‘let’, but lexically scoped.
  The main visible difference is that lambdas inside BODY will
  create lexical closures as in Common Lisp.

  Probably introduced at or before Emacs version 24.3.

That docstring isn't good either BTW as has been mentioned ...

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