RE: [External] : Re: master 927b885 1/3: Disable filtering of commands in M-x completion

[Drew Adams]

> I don't understand what you are saying.  Commands with "r" interactive
> spec always signaled an error if mark wasn't set, it's a very old and
> documented behavior.  What do you mean by "just work" here?

Dunno what the mystery is.
For me it just works; no error raised.

(defun foo (&optional beg end)
 (interactive "r")
 (message "FOO"))

1. `emacs -Q'
2. Eval that defun.
3. `M-x foo'

Just works.
No mark set, no active region, no error.
What am I missing?