import trio import tractor async def assert_err(): assert 0 async def main(): async with tractor.open_nursery() as n: real_actors = [] for i in range(3): real_actors.append(await n.start_actor( f'actor_{i}', enable_modules=[__name__], )) # start one actor that will fail immediately await n.run_in_actor(assert_err) # should error here with a ``RemoteActorError`` containing # an ``AssertionError`` and all the other actors have been cancelled if __name__ == '__main__': try: # also raises trio.run(main) except tractor.RemoteActorError: print("Look Maa that actor failed hard, hehhh!")