bug#66991: Confusion in interactive-form with commands with bare interactive forms.

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 7 Nov 2023 16:38:51 +0000
> From: Alan Mackenzie <acm@muc.de>
> 
> Consider commands with no arguments, and do interactive-form on them:
> 
> (interactive-form 'x-print-frames-dialog) => (interactive "") # a primitive
> 
> (interactive-form 'universal-argument) => (interactive nil) # a native
>                                                       compiled command.
> The result is the same from a byte compiled command.
> 
> Write (defun foo () (interactive)) in *scratch*, and C-M-x to evaluate
> it:
> (interactive-form 'foo) => (interactive).
> 
> That's three different inconsistent ways of expressing "(interactive".
> This is a bug.  For consistency's sake, two of them must be incorrect.

Why?  Please explain in more positive terms why two out of three must
be bugs, not just in some abstract philosophical terms.

> I believe the correct one is the last of these, "(interactive)" which is
> after all, what appears in the Lisp sources.  The fix should be
> relatively simple, in Finteractive_form in src/data.c

Please wait with implementing a fix until we discuss the issue and
decide whether and how it should be fixed.

Adding Stefan to the discussion.