1.1.8.17. osx.cocoa.RetainCount (ObjC)
Check for leaks and improper reference count management

Examples:

void test() {
  NSString *s = [[NSString alloc] init]; // warn
}

CFStringRef test(char *bytes) {
  return CFStringCreateWithCStringNoCopy(
           0, bytes, NSNEXTSTEPStringEncoding, 0); // warn
}