Re: GNU Emacs raison d'etre

[Eli Zaretskii]

> Cc: address@hidden, address@hidden,
>  address@hidden, address@hidden, address@hidden,
>  address@hidden, address@hidden, address@hidden,
>  address@hidden, address@hidden, address@hidden,
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> From: martin rudalics <address@hidden>
> Date: Wed, 20 May 2020 19:45:38 +0200
> 
> Right.  Then I'm lost.  With either
> 
> (defun my-fun (string) "")
> 
> or
> 
> (defun my-fun (string) t)
> 
> and
> 
> (setq set-message-function 'my-fun)
> 
> (message "?") displays "?".  What am I doing wrong?

You are evaluation the call to 'message', so the return value is
printed in the echo-area by the evaluation.  The telltale quotes are
the indication of that.