Immutable separator to join() doesn't work

[so]

On Tue, 12 Jul 2011 00:58:04 +0300, Timon Gehr <timon.gehr at gmx.ch> wrote:

> Wouldn't that be quite invasive? I imagine every function that would  
> want to work
> on ranges would then have to provide two versions, one that does the  
> work and one
> that calls the other version after having applied the adaptor(s)?
>
> Cheers,
> -Timon

Right, we probably need to change functions but no we don't need to  
overload any of them.