import asyncio
class EvilLoop:
    def call_soon(*args):
        # will crash before it actually gets here 
        print(args)
    def get_debug(self):
        return False
    def __getattribute__(self, name):
        global tracker
        if name == "call_soon":
            fut.remove_done_callback(tracker)
            del tracker
            print("returning call_soon method after clearing callback0")
        return object.__getattribute__(self, name)
class TrackDel:
    def __del__(self):
        print("deleted", self)
fut = asyncio.Future(loop=EvilLoop())
tracker = TrackDel()
fut.add_done_callback(tracker)
fut.set_result("kaboom")

deleted <__main__.TrackDel object at 0x7f4ab660a420>
returning call_soon method after clearing callback0
Python/context.c:534: _PyObject_GC_UNTRACK: Assertion "_PyObject_GC_IS_TRACKED(((PyObject*)(op)))" failed: object not tracked by the garbage collector
Enable tracemalloc to get the memory block allocation traceback
object address  : 0x7f4ab64ca4b0
object refcount : 0
object type     : 0x9bfc60
object type name: _contextvars.Context
object repr     : <refcnt 0 at 0x7f4ab64ca4b0>
Fatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailed
Python runtime state: initialized
TypeError: EvilLoop.call_soon() got an unexpected keyword argument 'context'