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NSAssert([self.delegate conformsToProtocol: @protocol(UISearchBarDelegate)], @"Some Error.");
Protocol *counter = @protocol(ReferenceCounting);
@protocol ReferenceCounting
-setRefCount: (int)count;
-(int)refCount;
-incrementCount;
-decrementCount;
@end
@interface Formatter : NSObject<Formatting, Prettifying>
@end
if ([receiver conformsTo: @protocol(ReferenceCounting)])
{
[receiver incrementCount];
}
@protocol B;
@protocol A
-Foo: (id<B>)anObject;
@end
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