Ranges, constantly frustrating

[Marc Schütz" <schuetzm at gmx.net>]

On Friday, 14 February 2014 at 17:42:53 UTC, bearophile wrote:
> Isn't this discussion about adding an index to a range? If it 
> is, then I have shown why adding it in the language is a bad 
> idea.

As far as I understand it, it's about adding an index to 
_foreach_, as is already supported for arrays:

foreach(v; [1,2,3,4])
     writeln(v);
foreach(i, v; [1,2,3,4])
     writeln(i, " => ", v);

But for ranges, the second form is not possible:

foreach(v; iota(4))           // ok
     writeln(v);
foreach(i, v; iota(4))        // Error: cannot infer argument 
types
     writeln(i, " => ", v);