type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    function pro(a: string): string; overload;    <--- 에러 없다.
    function pro(a: integer): integer; overload; <---에러 없다.
    { Public declarations }
  end;


type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    function pro(a: string): string; overload;    <--- 에러 없다.
  private
    { Private declarations }
  public
    function pro(a: integer): integer; overload; <---에러 없다.
    { Public declarations }
  end;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    function pro(a: string): string; overload;    <--- 에러 발생
    function pro(a: integer): integer; overload; <---에러 발생
  private
    { Private declarations }
  public
    { Public declarations }
  end;


위 3가지가 왜 그런지 궁금하네요.. ^^