opNext: Simplified ranges

[Dukc]

On Saturday, 5 November 2022 at 18:08:39 UTC, Paul Backus wrote:
> On Saturday, 5 November 2022 at 15:17:42 UTC, Steven 
> Schveighoffer wrote:
>> This can be solved by a wrapper:
> 
> You'd think, but if you actually try this, it turns out it 
> doesn't work: the compiler is "smart" enough to see through the 
> `alias this`, and makes a copy of `range.refOf._get` (the 
> actual range object) instead of `range.refOf` (the wrapper).

This works:

```D
void main()
{   import std.range : inputRangeObject, refRange;
     import std.stdio;

     auto testPiece = [1,2,3,4,5];
     foreach(el; (&testPiece).refRange.inputRangeObject)
     {   if(el == 3) break;
     }
     writeln(testPiece); // [3, 4, 5]
}
```

It's far from satisfying though. Ugly to begin with, and worse, 
incompatible with any function attributes.