Tricky semantics of ranges & potentially numerous Phobos bugs

[Tommi]

On Tuesday, 16 October 2012 at 05:49:11 UTC, Jonathan M Davis 
wrote:
> So, I don't really know what the right answer is, but I 
> _really_ don't like the idea of having to worry about
> the result of front changing after a call to popFront
> in every single function that ever uses front.

Isn't the deeper underlying problem here the fact that there's no 
generic way to make a deep copy in this language (does any 
language?) Making a deep copy of front would be a clean solution. 
I don't know how to implement this generic deep copying 
functionality though. For example: what would be the semantics of 
deep-copying a range?