Rust switches to external iteration

[bearophile]

Andrei Alexandrescu:

> That would be a win if input ranges are very frequent.

As I have explained in one of my recent answers in this thread in 
Python "input ranges" are used all the time.

So in your analysis you should also hypothesize how frequent 
input ranges are going to appear in D if you offer a handy and 
compact built-in syntax to create them.


> A consideration is also the cost of adding yield to the 
> language (somehow this often gets neglected in the excitement 
> of adding stuff).

Of course. C#, its history and coding probably is a starting 
point to assess how much complexity causes this addition.

Bye,
bearophile