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From: Eric Abrahamsen <eric@ericabrahamsen.net>
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Subject: Re: How do I pass a variable defined in a wrapping let, to a lambda?
Date: Sun, 13 Mar 2022 09:06:02 -0700
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Emanuel Berg via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> Steinar Bang wrote:
>
>>> They've got a lexical-binding cookie at the top of the
>>> file, but you don't! :)
>>
>> Wait..? What...?  Huh...?
>>
>> This thing:  -*- lexical-binding: t; -*- ?
>
> Why didn't that work, you had it when you asked the question?

He didn't have it in his .emacs file.