问题枚举类型为什么不支持点引用？

1 unit Unit2;
2
3
4 interface
5
6 type
7 TMyType &＃61; (My1,My2,My3);
8
9 implementation
10
11 end.

1 unit Unit1;
2
3 interface
4
5 uses
6 Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
7 Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;
8
9 type
10 TForm1 &＃61; class(TForm)
11 Button1: TButton;
12 procedure Button1Click(Sender: TObject);
13 private
14 { Private declarations }
15 public
16 { Public declarations }
17 end;
18
19 var
20 Form1: TForm1;
21
22 implementation
23 uses
24 Unit2;//引用枚举类型所在单元
25 {$R *.dfm}
26
27 procedure TForm1.Button1Click(Sender: TObject);
28 var
29 tMy: TMyType; //定义一个类型变量
30 begin
31 tMy :&＃61; Unit2.My1; //XE10.2 D7都支持
32 tMy :&＃61; Tmytype(0); //XE10.2 D7都支持
33 tMy :&＃61; Tmytype.My1; //XE10.2支持 D2007 D7不支持
34 tMy :&＃61; Tmytype(My1);//XE10.2支持&＃xff0c;但我感觉没有意义
35 end;
36
37 end.