#!/usr/bin/env python3

import sys
import gc
import ctypes

def main():
    m = memoryview(bytearray(b'a'))
    a = [ctypes.c_char.from_buffer(m)]
    b = [a]
    a.append(b)
    del m, a, b
    gc.collect()
         
if __name__ == "__main__":
    sys.exit(main())