method-copy-experiment

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

@interface A : NSObject - (void)abc; @end
@interface B : A @end
@interface C : B @end
@implementation A - (void)abc { NSLog(@"-[A abc]"); } @end
@implementation B @end
@implementation C - (void)abc { [super abc]; NSLog(@"-[C abc]"); } @end
@interface X : NSObject - (void)xyz; @end
@implementation X
+ (void)load {
	Method method = class_getInstanceMethod([C class], @selector(abc));
	IMP imp = method_getImplementation(method);
	const char *typeEncoding = method_getTypeEncoding(method);
	class_addMethod(self, @selector(xyz), imp, typeEncoding);
}
@end

int main(int argc, char *argv[]) {
	[[X new] xyz];
}