1@class A;
2
3@class A;
4
5@class A;
6
7@class B;
8
9@protocol P1;
10
11@protocol P2;
12@protocol P2;
13
14struct S1;
15struct S2;
16struct S2;
17
18int func1(int);
19
20void eventually_noreturn(void);
21