Type inference error with DI

[Dukc]

On Monday, 27 September 2021 at 19:36:04 UTC, Salih Dincer wrote:
>
> It is thrown an error* because of type object.Object[].
>
> (*) DIsampleFoo.d(34): Error: no property `Str` for type 
> `object.Object`

I don't think D will automatically use a common interface as a 
base type. Either change `auto test` to `ICon[] test` or make 
`ICon` an abstract class, and I think it'll work.