Does this no longer have the cycle?

blockmaybefixed.m

#import <Foundation/Foundation.h>

@interface A : NSObject
- (void)doThingWithObject:(id)o completion:(void(^)(void))completionHandler;
@end

@implementation A
- (void)doThingWithObject:(id)o completion:(void(^)(void))completionHandler
{
  NSLog(@"object: %@", o);
  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    if(completionHandler) completionHandler();
  });
}
@end

int main(int argc, char *argv[]) {
  @autoreleasepool {
    A *a = [A new];
    NSArray *someThings = @[@0, @1, @2];
    NSEnumerator *e = [someThings objectEnumerator];
    void(^ completionHandler)(void);
    __unsafe_unretained __block void(^handler)(void);
    completionHandler = ^{
      id o = [e nextObject];
      if (o) {
        [a doThingWithObject:o completion:handler];
      }
    };
    completionHandler = [completionHandler copy];
    handler = completionHandler;
    completionHandler();
    sleep(1);
  }
}

When the variable it's not a block I use __weak. But I get another warning with this

Bot with a block I'm clueless.