Re: mm-uu-extract was: How to create a higher order function?

[Leo Butler]

Emanuel Berg via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org> writes:

> Leo Butler wrote:
>
>> Q: I see you use mu4e. How do you get the code highlighted?
>> (in my Gnus, the background is distinctive blue).
>
> Yep, looks baaad!
>
> The face is `mm-uu-extract', one can disable it that way.
>
> Do `gnus-summary-show-article' with C-u to see that it looks
> like this:
>
> --8<---------------cut here---------------start------------->8---
> ;;; -*- lexical-binding: nil; -*-
> (defun negate (fun)
>   "Try to return a function returning the logical opposite of FUN."
>   (lambda (&rest args)
>     (not (apply fun args))))
> --8<---------------cut here---------------end--------------->8---

Thanks. Funny, Gnus used to show those markers, but it no longer
does...which seems like a regression to me.

Anyhow, what is the function/key sequence that inserts those markers
into a Message buffer?

TIA,
Leo