1 @interface Foo(LeftSub) <P1>
2 - (void)left_sub;
3 @end
4 
5 @protocol P3
6 - (void)p3_method;
7 @property (retain) id p3_prop;
8 @end
9 
10 @interface Foo(LeftP3) <P3>
11 @end
12