!7 set flag WeakRefVMBusListener_debug. cprint2 TestWeakRefVMBusListener { start-thread { S msg = "yoyoyo"; repeat 3 { vmBus_onMessage_weakRef(msg, arg -> enter { print("Got arg: " + arg); }); } int i = 0; repeat 10 { vmBus_send(msg, print(++i)); sleepSeconds(1); } print("GC"); gc(); repeat 10 { vmBus_send(msg, print(++i)); sleepSeconds(1); } } }