//! [BOLT #9]: https://github.com/lightningnetwork/lightning-rfc/blob/master/09-features.md
//! [messages]: crate::ln::msgs
-use std::{cmp, fmt};
-use std::marker::PhantomData;
+use core::{cmp, fmt};
+use core::marker::PhantomData;
use bitcoin::bech32;
use bitcoin::bech32::{Base32Len, FromBase32, ToBase32, u5, WriteBase32};