[Issue 18410] [REG 2.079a] Conflict between overloads distinguished by parameter constness

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18410

--- Comment #1 from Basile B. <b2.temp at gmx.com> ---
The second example is unrelated actually. I can see the same problem with

```
struct  Bar
{
    this(const int){}
    this(const const(int)){}
}
```

DMD 2.078.2 still accepts. Not 2.079a

--