What was so crazy about IFTI for parent agregate via ctor call ?

[user1234]

For reference it's the old DIP 40 [0] so a thing like

```d
struct IPersonallyPresentYouDip40(T)
{
     this(T t){}
}

void main()
{
     auto v = IPersonallyPresentYouDip40(0); // infer `int` for `T`
}
```

should work.

[0]: https://wiki.dlang.org/DIP40