Re: (copy-marker nil)

[Andreas Röhler]

On 08.05.2018 03:46, Stefan Monnier wrote:
> > Is there a use-case for a marker pointing nowhere?
>
> Yes.
>
> >  From my point of view refusing to create such a marker makes sense.
>
> It would break existing code. 


Thats a concern. It would surprise me though. Do you have an example.


 BTW "check for a valid buffer position"
> won't work with copy-marker for other reasons (e.g. (copy-marker 0)
> returns a marker pointing to (point-min), even though 0 is not a valid
> position).

Well, zero here is a special case. But copying a marker out of nil seems 
not logically. Resp. thats how the universe started? ;)