I'm developing some iOS app with the latest Xcode. I'm currently interested in Xcode's Leaks tool.

And I used Leaks to run my app (which contains thousands of lines of code and is in no way memory safe). I ran my app and did all kinds of stuff on it. But Leaks just didn't report any leaking (as was in this screen shot <http://d.pr/NKbF>).

I then tried to use this set of codes to *simulate* some leaks:

```
int i = rand();
NSMutableString *leak = [[NSMutableString alloc] initWithFormat:@"%d qwerty", i];
leak = NULL;

```

But again no leaks were reported.

Help... Anyone can help me? :-(