Implicit type conversion depending on assignment

[Alexander Zhirov]

Is it possible to convert such records inside the structure to 
the assigned type?

```d
struct MyVal
{
     string value;
     // Here it would be possible to use an alias to this, but it 
can only be used 1 time
}

auto a = MyVal("100");
auto b = MyVal("11.2");

int MyInt = a;        // Implicitly convert to target type
float myFloat = b;    // Implicitly convert to target type
```