how to create instance even alloc return nil

test.m

#import "AppDelegate.h"

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

@interface Test : NSObject


@end

@implementation Test

+ (id)alloc {
    return nil;
}

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    id test = [Test alloc];
    NSLog(@"%@", test); // (null)
    
    // 1. use objc_msgSendSuper to call [NSObject alloc]
    id metaclass = objc_getMetaClass("NSObject");
    struct objc_super superstruct = {[Test class], metaclass};
    id obj = objc_msgSendSuper(&superstruct, @selector(alloc));
    NSLog(@"%@", obj); // <Test: 0x751dae0>
    
    // 2. just call IMP of [NSObject alloc]
    IMP allocimp = [NSObject methodForSelector:@selector(alloc)];
    id obj2 = allocimp([Test class], @selector(alloc));
    NSLog(@"%@", obj2); // <Test: 0x712e6f0>
    
    return YES;
}

@end