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points by brabel 1 day ago | 0 comments

emacs 31+ started emiting this warning for my custom Lisp files:

Warning (files): Missing ‘lexical-binding’ cookie in "~/.emacs.d/custom.el". You can add one with ‘M-x elisp-enable-lexical-binding RET’. See ‘(elisp)Selecting Lisp Dialect’ and ‘(elisp)Converting to Lexical Binding’ for more information.

I am still trying to figure out what to do! The manual is quite verbose and I haven't had the patience to go through it yet.

[–] Jtsummers 1 day ago

If you open the file and execute:

  M-x elisp-enable-lexical-binding RET

It will add a cookie (lexical-binding) to the top of the file. If you want to do it manually put this:

  ;; -*- lexical-binding: nil; -*-

or this:

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

at the top of your custom.el file. They want it to be explicit now because eventually lexical will be the default. If you put in the former then when lexical becomes the default, the file will still use the current dynamic bindings. And if you use the latter, if there are issues you'll discover them now before the default changes and you're surprised by it.

[–] jibalt 1 day ago

It told you exactly what to do.