gistfile1.m

/// Root Class
@interface Root : NSObject
@end

@implementation Root

static NSString *const SelectorSuffix = @":";

- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector
{
    NSMethodSignature *signature = [super methodSignatureForSelector:aSelector];

    // Not called.

    return signature;
}

- (void)forwardInvocation:(NSInvocation *)anInvocation
{
  // Of course not called.
}


@end


@interface SubRoot : Root
@property (strong, nonatomic) id object;
@end

@implementation SubRoot
- (id)object
{
  NSString *blah = @"hello world";
  
  return blah;
}