Fixing clippy warnings

sync/src/chain.rs

@@ -1307,7 +1307,7 @@ impl ChainSync {
 		where T: Fn(&Address) -> U256
 	{
 		let mut queue = self.transaction_queue.lock().unwrap();
-		queue.add(transaction, fetch_nonce);
+		let _ = queue.add(transaction, fetch_nonce);
 	}
 }
 

sync/src/lib.rs

@@ -17,9 +17,10 @@
 #![warn(missing_docs)]
 #![cfg_attr(all(nightly, feature="dev"), feature(plugin))]
 #![cfg_attr(all(nightly, feature="dev"), plugin(clippy))]
-
 // Keeps consistency (all lines with `.clone()`) and helpful when changing ref to non-ref.
 #![cfg_attr(all(nightly, feature="dev"), allow(clone_on_copy))]
+// In most cases it expresses function flow better
+#![cfg_attr(all(nightly, feature="dev"), allow(if_not_else))]
 
 //! Blockchain sync module
 //! Implements ethereum protocol version 63 as specified here:
@@ -172,6 +173,7 @@ impl NetworkProtocolHandler<SyncMessage> for EthSync {
 		self.sync.write().unwrap().maintain_sync(&mut NetSyncIo::new(io, self.chain.deref()));
 	}
 
+	#[allow(single_match)]
 	fn message(&self, io: &NetworkContext<SyncMessage>, message: &SyncMessage) {
 		match *message {
 			SyncMessage::NewChainBlocks { ref good, ref bad, ref retracted } => {

sync/src/transaction_queue.rs

@@ -79,6 +79,7 @@
 //!		- When it's removed from `current` - all transactions from this sender (`current` & `future`) are recalculated.
 //!
 
+use std::default::Default;
 use std::cmp::{Ordering};
 use std::collections::{HashMap, BTreeSet};
 use util::numbers::{Uint, U256};
@@ -102,6 +103,7 @@ struct TransactionOrder {
 	hash: H256,
 }
 
+
 impl TransactionOrder {
 	fn for_transaction(tx: &VerifiedTransaction, base_nonce: U256) -> Self {
 		TransactionOrder {
@@ -253,6 +255,12 @@ pub struct TransactionQueue {
 	last_nonces: HashMap<Address, U256>,
 }
 
+impl Default for TransactionQueue {
+	fn default() -> Self {
+		TransactionQueue::new()
+	}
+}
+
 impl TransactionQueue {
 	/// Creates new instance of this Queue
 	pub fn new() -> Self {