1.weak_register_no_lock
- thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
frame #0: 0x00000001bcb4caa4 libsystem_kernel.dylib`__abort_with_payload + 8
frame #1: 0x00000001bcb5195c libsystem_kernel.dylib`abort_with_payload_wrapper_internal + 104
frame #2: 0x00000001bcb518f4 libsystem_kernel.dylib`abort_with_reason + 32
frame #3: 0x00000001a33f35ec libobjc.A.dylib`_objc_fatalv(unsigned long long, unsigned long long, char const*, char*) + 108
frame #4: 0x00000001a33f3580 libobjc.A.dylib`_objc_fatal(char const*, ...) + 32
frame #5: 0x00000001a33ef0d8 libobjc.A.dylib`weak_register_no_lock + 336
frame #6: 0x00000001a33f1470 libobjc.A.dylib`objc_initWeak + 312
* frame #7: 0x0000000104a49868 UIDynamicTest`-[TestClass dealloc]
