Fixing warnings (#1321)

ethcore/src/state.rs

@@ -229,11 +229,11 @@ impl State {
 			// collect all the addresses which have changed.
 			let addresses = self.cache.borrow().iter().map(|(addr, _)| addr.clone()).collect::<Vec<_>>();
 
-			for a in addresses.iter() {
+			for a in &addresses {
-				if self.code(a).map(|c| c.sha3() == broken_dao).unwrap_or(false) {
+				if self.code(a).map_or(false, |c| c.sha3() == broken_dao) {
 					// Figure out if the balance has been reduced.
 					let maybe_original = SecTrieDB::new(self.db.as_hashdb(), &self.root).expect(SEC_TRIE_DB_UNWRAP_STR).get(&a).map(Account::from_rlp);
-					if maybe_original.map(|original| *original.balance() > self.balance(a)).unwrap_or(false) {
+					if maybe_original.map_or(false, |original| *original.balance() > self.balance(a)) {
 						return Err(Error::Transaction(TransactionError::DAORescue));
 					}
 				}

ethcore/src/tests/client.rs

@@ -113,6 +113,7 @@ fn can_collect_garbage() {
 }
 
 #[test]
+#[cfg_attr(feature="dev", allow(useless_vec))]
 fn can_generate_gas_price_statistics() {
 	let client_result = generate_dummy_client_with_data(16, 1, &vec_into![0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]);
 	let client = client_result.reference();

ethcore/src/tests/helpers.rs

@@ -140,7 +140,7 @@ pub fn create_test_block_with_data(header: &Header, transactions: &[SignedTransa
 }
 
 pub fn generate_dummy_client(block_number: u32) -> GuardedTempResult<Arc<Client>> {
-	generate_dummy_client_with_spec_and_data(Spec::new_test, block_number, 0, &(vec![]))
+	generate_dummy_client_with_spec_and_data(Spec::new_test, block_number, 0, &[])
 }
 
 pub fn generate_dummy_client_with_data(block_number: u32, txs_per_block: usize, tx_gas_prices: &[U256]) -> GuardedTempResult<Arc<Client>> {

sync/src/chain.rs

@@ -1170,7 +1170,7 @@ impl ChainSync {
 								.expect("chain.tree_route and chain.find_uncles only return hahses of blocks that are in the blockchain. qed.")).number();
 							hash_rlp.append(&block_hash);
 							hash_rlp.append(&number);
-							rlp_stream.append_raw(&hash_rlp.as_raw(), 1);
+							rlp_stream.append_raw(hash_rlp.as_raw(), 1);
 						}
 						Some(rlp_stream.out())
 					}

sync/src/lib.rs

@@ -124,12 +124,11 @@ impl EthSync {
 	/// Creates and register protocol with the network service
 	pub fn new(config: SyncConfig, chain: Arc<Client>) -> Arc<EthSync> {
 		let sync = ChainSync::new(config, chain.deref());
-		let sync = Arc::new(EthSync {
+		Arc::new(EthSync {
 			chain: chain,
 			sync: RwLock::new(sync),
 			io_channel: RwLock::new(IoChannel::disconnected()),
-		});
+		})
-		sync
 	}
 
 	/// Register protocol with the network service

util/src/network/host.rs

@@ -252,7 +252,7 @@ impl<'s, Message> NetworkContext<'s, Message> where Message: Send + Sync + Clone
 
 	/// Check if the session is still active.
 	pub fn is_expired(&self) -> bool {
-		self.session.as_ref().map(|s| s.lock().unwrap().expired()).unwrap_or(false)
+		self.session.as_ref().map_or(false, |s| s.lock().unwrap().expired())
 	}
 
 	/// Register a new IO timer. 'IoHandler::timeout' will be called with the token.