use prelude::*;
use alloc::collections::LinkedList;
use alloc::fmt::Debug;
-use std::sync::{Arc, Mutex};
+use sync::{Arc, Mutex};
use core::sync::atomic::{AtomicUsize, Ordering};
use core::{cmp, hash, fmt, mem};
use core::ops::Deref;
use bitcoin::secp256k1::key::{SecretKey, PublicKey};
use prelude::*;
- use std::sync::{Arc, Mutex};
+ use sync::{Arc, Mutex};
use core::sync::atomic::Ordering;
#[derive(Clone)]