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unit test;

interface

type
  BaseClass = class
  protected
    procedure ChildProc; virtual; abstract;
  published
    procedure Go();
  end;

type
  ChildClass = class(BaseClass)
  published
    procedure ChildProc;
  end;

implementation

procedure BaseClass.Go();
begin
  Self.ChildProc()
end;

procedure ChildClass.ChildProc;
begin
  writeln('bla');
end;

end.					

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program ptest;
{$APPTYPE CONSOLE}

uses
  SysUtils,
  test in 'test.pas';

var
  bla: ChildClass;

begin
  try
    bla := ChildClass.Create();
    bla.Go();

  except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;

end.					

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type
  ChildClass = class(BaseClass)
  published
    procedure ChildProc; override;
  end;