#import <stdio.h>
#import <objc/objc.h>
#import <objc/Object.h>

@interface Hello : Object
- (void)hello;
@end

@implementation Hello
- (void)hello {
    printf("Hello world\n");
}
@end

int main() {
  id obj = [Hello alloc];
  [obj hello];
  return 0;
}
/* end */