import sys
import weakref
import os

class Object:
    def __del__(self, builtin_print=print, file=sys.stderr):
        # fails because sys.stderr is already closed
        builtin_print("__del__", file=file)

def callback(*obj, builtin_print=print, file=sys.stderr):
    # not called: weak references cleared instead
    builtin_print("weakref callback", file=file)

def unraisable(obj, os_exit=os._exit):
    # not called: sys.unraisablehook already cleared
    os_exit(5)

obj = Object()
sys.obj_ref = weakref.ref(obj, callback)
sys.unraisablehook = unraisable