From: Harald Oehlmann on
> > So now, it seams to be in a semi-existing state.
> > "runonce" does not give any error but info command does not return it.
>
> If that's an accurate transcript, you have a buggy interp.  Double
> check, get more details and report.

I think I have hit myself by the interactive interpreter magic
executing external commands
when no internal one found.
There must be a command "runonce" in the path.
A small window is opened and directly closed...
exec runonce
also gives an empty string back.
---
To resume, it is allowed to rename a proc inside itself including
deletion.

Thank you all for answering. I will add a note on the wiki,
Harald