use ln::msgs;
use ln::msgs::{ChannelMessageHandler, HTLCFailChannelUpdate, OptionalField};
use util::test_utils;
-use util::events::{Event, EventsProvider, MessageSendEvent, MessageSendEventsProvider};
+use util::events::{Event, MessageSendEvent, MessageSendEventsProvider};
use util::ser::{Writeable, Writer};
use util::config::UserConfig;
use bitcoin::secp256k1::Secp256k1;
use bitcoin::secp256k1::key::SecretKey;
-use std::default::Default;
+use core::default::Default;
use std::io;
use ln::functional_test_utils::*;