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To: ding@gnus.org
From: Wayne Harris <wharris1@protonmail.com>
Subject: Re: my attach this buffer
Date: Mon, 23 Aug 2021 09:06:10 -0300
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Uwe Brauer <oub@mat.ucm.es> writes:

[...]

> (defun my-attach-this-buffer ()
>   "Send the whole buffer, funny to note that such a function does not exist."
>   (interactive)
>   (let  ((src-buf (buffer-file-name (current-buffer))))
>     (gnus-summary-post-news)
>     (mail-text)
>     (mml-attach-buffer src-buf "application/octet-stream" nil nil)
>     (message-goto-to)))

What version of Gnus are you using?  I don't have mail-text on my Gnus
v5.13 running on GNU Emacs 27.1 (build 1, x86_64-w64-mingw32) of
2020-08-21.