bug#50460: 27.1; defcustom for mail-user-agent is too strict?

[Lars Ingebrigtsen]

David Bremner <david@tethera.net> writes:

> The defcustom for mail-user-agent looks like
>
> :type '(radio (function-item :tag "Message package"
>                              :format "%t\n"
>                              message-user-agent)
> ;; [...] snip                               
>               (function-item :tag "Message with full Gnus features"
>                              :format "%t\n"
>                              gnus-user-agent)
>               (function :tag "Other"))
>
> This means that a symbol without a function definition cannot be set
> (using customize) as mail-user-agent. This seem inconsistent with the
> docstring of define-mail-user-agent, 

Yup.  Now fixed in Emacs 28.

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