bug#59920: [PATCH] Make checkdoc warn if not using lexical-binding

[Stefan Kangas <stefankangas@gmail.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> +(defcustom checkdoc-lexical-binding-flag t
>> +  "Non-nil means generate warnings if file is not using lexical binding.
>> +See Info node `(elisp) Converting to Lexical Binding' for more."
>> +  :type 'boolean
>> +  :version "29.1")
>
> Should be "30.1", I guess?

Yes, well spotted.

>> +                 (checkdoc-create-error
>> +                  "The first line should end with \"-*- lexical-binding: t -*-\""
>
> Is this accurate?  IOW, does the lexical-binding cookie have to be the
> last on the first line?

You're right, it's not accurate.  I changed it to say:

    The first line should contain "-*- lexical-binding: t -*-"

> Otherwise, LGTM, thanks.

Thanks.