Unexpected behaviour of foreach statement

[Arredondo]

On Friday, 2 March 2018 at 10:32:08 UTC, Jonathan M Davis wrote:
> foreach does not support indices for ranges, only arrays. When 
> you have
>
> foreach(e; range)
>
> it gets lowered to
>
> foreach(auto __range = range; !__range.empty; 
> __range.popFront())
> {
>     auto e = __range.front;
> }
>
> There are no indices involved there, and if a range isn't a 
> random-access range, it doesn't support any kind of indices 
> anyway. The compiler would have to add a variable to count the 
> elements, and it doesn't support that.

I understand. I guess I was expecting the compiler to 
automatically do something along the lines of what enumerate 
does. Although, a nicer error message would have saved the day 
just as well.

Arredondo