Delphi interface inheritance: Why can't I access ancestor interface's members?

Question

Assume you have the following:

//Note the original example I posted didn\'t reproduce the problem so
//I created an clean example  
  type
    IParent = inte         


        

Answer 1

edit: This answer is no longer relevant because it was posted before the original question got modified.

---

This compiles in Delphi 2010:

type
  IParent = interface(IInterface)
    function DoSomething: String;
  end;

  IChild = interface(IParent)
    function DoSomethingElse: string;
  end;

  TMyClass = class(TInterfacedObject, IChild)
  private
  public
    function DoSomething: String;
    function DoSomethingElse: String;
  end;

// ... 

procedure Test;
var
  MyObject : IChild;
begin
  MyObject := TMyClass.Create;
  MyObject.DoSomething;
end;