bug#17979: 24.3.92; Unhelpful error message with bad mail-user-agent

[Lars Ingebrigtsen]

Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr> writes:

> I just made a typo:
>
>   (setq mail-user-agent 'no-such-user-agent)
>
> If I call compose-mail, I receive the following error message:
>
>   compose-mail: Symbol's function definition is void: nil
>
> Granted, it's a user error, but the error message could be more helpful.

I've now made the error message more explicit in Emacs 27.1.

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   bloggy blog: http://lars.ingebrigtsen.no