Printing a range of ranges drains them

[Salih Dincer]

On Monday, 27 May 2024 at 00:25:42 UTC, Steven Schveighoffer 
wrote:

> So, does anyone expect this behavior? If so, can you explain 
> why you think this is intentionally designed this way?
>

I think everything is as it should be. Because each element in 
mdarr is a copy of each other. It will appear blank unless you 
rewind. You can see the situation with the reward() function:

```d
     //...
     auto a = R(arr.ptr, arr.length);
     auto arrs = [ a, a, a ];

     void reward(R[] r)
     {
         foreach(i,ref e; r)
         {
             ++i;
             foreach(_; 0..i)
             {
                 --e.ptr;
                 ++e.len;
             }
         }
     }
     writeln(arrs); // [[1, 2, 3], [1, 2, 3], [1, 2, 3]]
     reward(arrs);
     writeln(arrs); // [[3], [2, 3], [1, 2, 3]]
}
```

SDB at 79