BigInt foreach loop

[Q. Schroll via Digitalmars-d-learn]

On Friday, 4 August 2017 at 16:40:08 UTC, Stefan Koch wrote:
> [..]
>
> foreach(x;A .. B)
> it's lowerd to
> auto limit = B;
> auto key = A;
> for(auto x = key;key < limit;++key)
> {
>  // use x
> }

That's enough to know that the foreach loop does not reuse the 
space for the iteration variable. That was what I cared about.