std.v2020.algorithm etc[ WAS: Is run.d going to be expand for runtime and the phobos library?]

[Andrei Alexandrescu]

On 6/24/20 10:17 AM, Joseph Rushton Wakeling wrote:
> 
> I'm struck that no one AFAICS has suggested the following alternative: 
> instead of `tail`, to allow popFront() (and if implemented, popBack()) 
> to return an `Option!(ElementType, None)`.
> 
> What is returned would be either the popped element, or None if no more 
> elements remain (with the nice by-product of no longer getting assert 
> failures if pop{Front,Back} are called when the range is empty).

I think the discussion about tail() had to do with immutable ranges. 
Having popXxx() return something would still have it mutate the range.