Implicit conversion to base interface doesn't work inside initialization of AA of objects

[bearophile via Digitalmars-d]

Reduced:

interface IBase {}
class Impl(T): IBase {
     T value;
}
void main() {
     IBase a = true ? (new Impl!uint) : (new Impl!string);
}



test.d(6,23): Error: cannot implicitly convert expression (new 
Impl!uint) of type object.Object to test.IBase

Bye,
bearophile