Transient ranges

[Andrei Alexandrescu via Digitalmars-d]

On 05/30/2016 09:26 AM, Steven Schveighoffer wrote:
> Here is how I think about it: the front element is valid and stable
> until you call popFront. After that, anything goes for the old front.

Yah, we should have formal language in the library reference about this. 
-- Andrei