interface ICon
{
  string Str();
}

class Foo : ICon
{
  string Str() {
    return "Foo";
  }
}

class Bar : ICon
{
  string Str() {
    return "Bar";
  }
}

import std.stdio;

void main()
{
  auto foo = new Foo();
  ICon bar = new Bar();
  /* replace ICon with auto,
   * please...*/
  auto test =
  [
    foo, bar
  ];
  foreach(t; test)
  {
    t.Str.writeln;
  }
}

It is thrown an error* because of type object.Object[].

(*) DIsampleFoo.d(34): Error: no property Str for type object.Object

On Monday, 27 September 2021 at 19:36:04 UTC, Salih Dincer wrote:

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.