[emacs-berlin] Info-copy-current-node-name with function call to ‘info’

[jman]

Hello emacsers!

I've found in this blog post an interesting tip:
https://susam.net/emacs-info-expression.html

I knew that pressing `c` in info-mode will copy the info page title, example:

- Press `C-h i`
- Press `c`
- The text "(dir) Top" is now in the kill buffer

The blog post explains that by pressing "C-0 c" (that's control+zero then `c`) the whole lisp 
command invokation is copied, example:

(info "(dir) Top")

which is cool! However it doesn't work for me. My emacs 30.2 (Debian/forky) shows the message "0 is 
undefined" when I press `C-0` while in info-mode. Tried also running "emacs -Q" to prune out chances 
of misconfigurations on my end.

Any hint?

Thanks