Re: Deprecation: foreach: loop index implicitly converted from size_t to int

[BoQsc via Digitalmars-d-learn]

A horrible alternative would be to use `alias` on `size_t` to 
make up a new pseudo-type that is more aligned with the code 
logic.

```
alias integer = size_t;
import std.stdio : writefln;
void main() {
    auto arr = [
        [5, 15],      // 20
        [2, 3, 2, 3], // 10
        [3, 6, 2, 9], // 20
    ];

    foreach (integer i, row; arr)
    {
        double total = 0.0;
        foreach (e; row)
            total += e;

        auto avg = total / row.length;
        writefln("AVG [row=%d]: %.2f", i, avg);
    }
}
```