Bump clippy & Fix warnings (#2109)

* Bump clippy

* Fixing warnings

Cargo.lock

@@ -3,7 +3,7 @@ name = "parity"
 version = "1.4.0"
 dependencies = [
  "ansi_term 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "clippy 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "ctrlc 1.1.1 (git+https://github.com/ethcore/rust-ctrlc.git)",
  "daemonize 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "docopt 0.6.80 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -138,15 +138,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "clippy"
-version = "0.0.85"
+version = "0.0.90"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "clippy_lints 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy_lints 0.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "clippy_lints"
-version = "0.0.85"
+version = "0.0.90"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "matches 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -268,7 +268,7 @@ version = "1.4.0"
 dependencies = [
  "bit-set 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bloomchain 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "clippy 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethash 1.4.0",
@@ -287,7 +287,7 @@ dependencies = [
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "rayon 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rlp 0.1.0",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -309,7 +309,7 @@ dependencies = [
 name = "ethcore-dapps"
 version = "1.4.0"
 dependencies = [
- "clippy 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethabi 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore-devtools 1.4.0",
  "ethcore-rpc 1.4.0",
@@ -451,7 +451,7 @@ dependencies = [
 name = "ethcore-rpc"
 version = "1.4.0"
 dependencies = [
- "clippy 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethash 1.4.0",
  "ethcore 1.4.0",
  "ethcore-devtools 1.4.0",
@@ -479,7 +479,7 @@ dependencies = [
 name = "ethcore-signer"
 version = "1.4.0"
 dependencies = [
- "clippy 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore-devtools 1.4.0",
  "ethcore-io 1.4.0",
@@ -517,7 +517,8 @@ version = "1.4.0"
 dependencies = [
  "ansi_term 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "arrayvec 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "clippy 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bigint 0.1.0",
+ "clippy 0.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "elastic-array 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "eth-secp256k1 0.5.4 (git+https://github.com/ethcore/rust-secp256k1)",
@@ -603,7 +604,7 @@ dependencies = [
 name = "ethsync"
 version = "1.4.0"
 dependencies = [
- "clippy 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clippy 0.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethcore 1.4.0",
  "ethcore-io 1.4.0",
@@ -1307,7 +1308,7 @@ dependencies = [
 
 [[package]]
 name = "rayon"
-version = "0.3.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1863,8 +1864,8 @@ dependencies = [
 "checksum bytes 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c129aff112dcc562970abb69e2508b40850dd24c274761bb50fb8a0067ba6c27"
 "checksum bytes 0.4.0-dev (git+https://github.com/carllerche/bytes)" = "<none>"
 "checksum cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "de1e760d7b6535af4241fca8bd8adf68e2e7edacc6b29f5d399050c5e48cf88c"
-"checksum clippy 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)" = "97f6d6efa6d7aec74d4eca1be62164b605d43b7fcb5256e9db0449f685130cba"
+"checksum clippy 0.0.90 (registry+https://github.com/rust-lang/crates.io-index)" = "d19bda68c3db98e3a780342f6101b44312fef20a5f13ce756d1202a35922b01b"
-"checksum clippy_lints 0.0.85 (registry+https://github.com/rust-lang/crates.io-index)" = "dc96d3c877b63943b08ce3037c0ae8fd3bd5dead5fab11178b93afc71ca16031"
+"checksum clippy_lints 0.0.90 (registry+https://github.com/rust-lang/crates.io-index)" = "3d4ed67c69b9bb35169be2538691d290a3aa0cbfd4b9f0bfb7c221fc1d399a96"
 "checksum cookie 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "90266f45846f14a1e986c77d1e9c2626b8c342ed806fe60241ec38cc8697b245"
 "checksum crossbeam 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)" = "fb974f835e90390c5f9dfac00f05b06dc117299f5ea4e85fbc7bb443af4911cc"
 "checksum ctrlc 1.1.1 (git+https://github.com/ethcore/rust-ctrlc.git)" = "<none>"
@@ -1950,7 +1951,7 @@ dependencies = [
 "checksum quick-error 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0aad603e8d7fb67da22dbdf1f4b826ce8829e406124109e73cf1b2454b93a71c"
 "checksum quine-mc_cluskey 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a6683b0e23d80813b1a535841f0048c1537d3f86d63c999e8373b39a9b0eb74a"
 "checksum rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "2791d88c6defac799c3f20d74f094ca33b9332612d9aef9078519c82e4fe04a5"
-"checksum rayon 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "941deb43a6254b9867fec1e0caeda38a2ad905ab18c57f7c68c396ca68998c07"
+"checksum rayon 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "655df67c314c30fa3055a365eae276eb88aa4f3413a352a1ab32c1320eda41ea"
 "checksum regex 0.1.68 (registry+https://github.com/rust-lang/crates.io-index)" = "b4329b8928a284580a1c63ec9d846b12f6d3472317243ff7077aff11f23f2b29"
 "checksum regex-syntax 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "841591b1e05609a643e3b4d0045fce04f701daba7151ddcd3ad47b080693d5a9"
 "checksum ring 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d059a6a96d3be79042e3f70eb97945912839265f9d8ab45b921abaf266c70dbb"

Cargo.toml

@@ -42,7 +42,7 @@ ethcore-logger = { path = "logger" }
 rlp = { path = "util/rlp" }
 json-ipc-server = { git = "https://github.com/ethcore/json-ipc-server.git" }
 ethcore-dapps = { path = "dapps", optional = true }
-clippy = { version = "0.0.85", optional = true}
+clippy = { version = "0.0.90", optional = true}
 ethcore-stratum = { path = "stratum" }
 
 [target.'cfg(windows)'.dependencies]

dapps/Cargo.toml

@@ -33,7 +33,7 @@ parity-dapps-status = { git = "https://github.com/ethcore/parity-ui.git", versio
 parity-dapps-home = { git = "https://github.com/ethcore/parity-ui.git", version = "1.4" }
 parity-dapps-wallet = { git = "https://github.com/ethcore/parity-ui.git", version = "1.4", optional = true }
 mime_guess = { version = "1.6.1" }
-clippy = { version = "0.0.85", optional = true}
+clippy = { version = "0.0.90", optional = true}
 
 [build-dependencies]
 serde_codegen = { version = "0.8", optional = true }

db/Cargo.toml

@@ -11,7 +11,7 @@ build = "build.rs"
 ethcore-ipc-codegen = { path = "../ipc/codegen" }
 
 [dependencies]
-clippy = { version = "0.0.85", optional = true}
+clippy = { version = "0.0.90", optional = true}
 ethcore-devtools = { path = "../devtools" }
 ethcore-ipc = { path = "../ipc/rpc" }
 rocksdb = { git = "https://github.com/ethcore/rust-rocksdb" }

ethcore/Cargo.toml

@@ -20,12 +20,12 @@ num_cpus = "0.2"
 crossbeam = "0.2.9"
 lazy_static = "0.2"
 bloomchain = "0.1"
-rayon = "0.3.1"
+rayon = "0.4.2"
 semver = "0.2"
 bit-set = "0.4"
 time = "0.1"
 evmjit = { path = "../evmjit", optional = true }
-clippy = { version = "0.0.85", optional = true}
+clippy = { version = "0.0.90", optional = true}
 ethash = { path = "../ethash" }
 ethcore-util = { path = "../util" }
 ethcore-io = { path = "../util/io" }

ethcore/src/block.rs

@@ -417,7 +417,7 @@ impl ClosedBlock {
 	}
 
 	/// Given an engine reference, reopen the `ClosedBlock` into an `OpenBlock`.
-	pub fn reopen<'a>(self, engine: &'a Engine) -> OpenBlock<'a> {
+	pub fn reopen(self, engine: &Engine) -> OpenBlock {
 		// revert rewards (i.e. set state back at last transaction's state).
 		let mut block = self.block;
 		block.state = self.unclosed_state;

ethcore/src/blockchain/blockchain.rs

@@ -1617,7 +1617,7 @@ mod tests {
 		let mut block_header = bc.block_header(&best_hash);
 
 		while !block_header.is_none() {
-			block_header = bc.block_header(&block_header.unwrap().parent_hash());
+			block_header = bc.block_header(block_header.unwrap().parent_hash());
 		}
 		assert!(bc.cache_size().blocks > 1024 * 1024);
 

ethcore/src/ethereum/ethash.rs

@@ -160,7 +160,7 @@ impl Engine for Ethash {
 		let fields = block.fields_mut();
 
 		// Bestow block reward
-		fields.state.add_balance(&fields.header.author(), &(reward + reward / U256::from(32) * U256::from(fields.uncles.len())));
+		fields.state.add_balance(fields.header.author(), &(reward + reward / U256::from(32) * U256::from(fields.uncles.len())));
 
 		// Bestow uncle rewards
 		let current_number = fields.header.number();

ethcore/src/miner/miner.rs

@@ -246,6 +246,7 @@ impl Miner {
 		self.sealing_work.lock().queue.peek_last_ref().map(|b| b.base().clone())
 	}
 
+	#[cfg_attr(feature="dev", allow(match_same_arms))]
 	/// Prepares new block for sealing including top transactions from queue.
 	fn prepare_block(&self, chain: &MiningBlockChainClient) -> (ClosedBlock, Option<H256>) {
 		{
@@ -672,6 +673,7 @@ impl MinerService for Miner {
 		results
 	}
 
+	#[cfg_attr(feature="dev", allow(collapsible_if))]
 	fn import_own_transaction(
 		&self,
 		chain: &MiningBlockChainClient,

ethcore/src/miner/transaction_queue.rs

@@ -949,7 +949,7 @@ mod test {
 		new_tx_pair(default_nonce(), default_gas_price(), nonce_increment, gas_price_increment)
 	}
 
-	/// Returns two transactions with identical (sender, nonce) but different gas_price/hash.
+	/// Returns two transactions with identical (sender, nonce) but different gas price/hash.
 	fn new_similar_tx_pair() -> (SignedTransaction, SignedTransaction) {
 		new_tx_pair_default(0.into(), 1.into())
 	}

ethcore/src/snapshot/tests/helpers.rs

@@ -45,6 +45,7 @@ impl StateProducer {
 		}
 	}
 
+	#[cfg_attr(feature="dev", allow(let_and_return))]
 	/// Tick the state producer. This alters the state, writing new data into
 	/// the database.
 	pub fn tick<R: Rng>(&mut self, rng: &mut R, db: &mut HashDB) {

ethcore/src/spec/spec.rs

@@ -183,7 +183,7 @@ impl Spec {
 			let r = Rlp::new(&seal);
 			(0..self.seal_fields).map(|i| r.at(i).as_raw().to_vec()).collect()
 		});
-		return header;
+		header
 	}
 
 	/// Compose the genesis block for this chain.
@@ -278,7 +278,7 @@ mod tests {
 	// https://github.com/ethcore/parity/issues/1840
 	#[test]
 	fn test_load_empty() {
-		assert!(Spec::load(&vec![] as &[u8]).is_err());
+		assert!(Spec::load(&[] as &[u8]).is_err());
 	}
 
 	#[test]

ethcore/src/state/mod.rs

@@ -1314,13 +1314,13 @@ fn storage_at_from_database() {
 	let temp = RandomTempPath::new();
 	let (root, db) = {
 		let mut state = get_temp_state_in(temp.as_path());
-		state.set_storage(&a, H256::from(&U256::from(01u64)), H256::from(&U256::from(69u64)));
+		state.set_storage(&a, H256::from(&U256::from(1u64)), H256::from(&U256::from(69u64)));
 		state.commit().unwrap();
 		state.drop()
 	};
 
 	let s = State::from_existing(db, root, U256::from(0u8), Default::default()).unwrap();
-	assert_eq!(s.storage_at(&a, &H256::from(&U256::from(01u64))), H256::from(&U256::from(69u64)));
+	assert_eq!(s.storage_at(&a, &H256::from(&U256::from(1u64))), H256::from(&U256::from(69u64)));
 }
 
 #[test]

json/Cargo.toml

@@ -10,7 +10,7 @@ rustc-serialize = "0.3"
 serde = "0.8"
 serde_json = "0.8"
 serde_macros = { version = "0.8", optional = true }
-clippy = { version = "0.0.85", optional = true}
+clippy = { version = "0.0.90", optional = true}
 
 [build-dependencies]
 serde_codegen = { version = "0.8", optional = true }

parity/boot.rs

@@ -54,12 +54,10 @@ pub fn payload<B: ipc::BinaryConvertable>() -> Result<B, BootError> {
 
 	let mut buffer = Vec::new();
 	try!(
-		io::stdin().read_to_end(&mut buffer)
+		io::stdin().read_to_end(&mut buffer).map_err(BootError::ReadArgs)
-			.map_err(|io_err| BootError::ReadArgs(io_err))
 	);
 
-	ipc::binary::deserialize::<B>(&buffer)
+	ipc::binary::deserialize::<B>(&buffer).map_err(BootError::DecodeArgs)
-		.map_err(|binary_error| BootError::DecodeArgs(binary_error))
 }
 
 pub fn register(hv_url: &str, control_url: &str, module_id: IpcModuleId) -> GuardedSocket<HypervisorServiceClient<NanoSocket>>{
@@ -73,7 +71,7 @@ pub fn register(hv_url: &str, control_url: &str, module_id: IpcModuleId) -> Guar
 pub fn dependency<C: WithSocket<NanoSocket>>(url: &str)
 	-> Result<GuardedSocket<C>, BootError>
 {
-	nanoipc::generic_client::<C>(url).map_err(|socket_err| BootError::DependencyConnect(socket_err))
+	nanoipc::generic_client::<C>(url).map_err(BootError::DependencyConnect)
 }
 
 pub fn main_thread() -> Arc<AtomicBool> {

parity/cli/usage.rs

@@ -169,14 +169,10 @@ macro_rules! usage {
 						let result = rustc_serialize::Decodable::decode(&mut toml::Decoder::new(toml::Value::Table(value)));
 						match result {
 							Ok(config) => Ok(config),
-							Err(e) => {
+							Err(e) => Err(e.into()),
-								return Err(e.into());
-							}
 						}
 					},
-					None => {
+					None => Err(ArgsError::Parsing(value_parser.errors)),
-						return Err(ArgsError::Parsing(value_parser.errors));
-					},
 				}
 			}
 

rpc/Cargo.toml

@@ -27,7 +27,7 @@ rlp = { path = "../util/rlp" }
 rustc-serialize = "0.3"
 transient-hashmap = "0.1"
 serde_macros = { version = "0.8.0", optional = true }
-clippy = { version = "0.0.85", optional = true}
+clippy = { version = "0.0.90", optional = true}
 json-ipc-server = { git = "https://github.com/ethcore/json-ipc-server.git" }
 ethcore-ipc = { path = "../ipc/rpc" }
 time = "0.1"

signer/Cargo.toml

@@ -22,7 +22,7 @@ ethcore-rpc = { path = "../rpc" }
 ethcore-devtools = { path = "../devtools" }
 parity-dapps-signer = { git = "https://github.com/ethcore/parity-ui.git", version = "1.4", optional = true}
 
-clippy = { version = "0.0.85", optional = true}
+clippy = { version = "0.0.90", optional = true}
 
 [features]
 dev = ["clippy"]

signer/src/ws_server/mod.rs

@@ -127,7 +127,7 @@ impl Server {
 		// Spawn a thread with event loop
 		let handle = thread::spawn(move || {
 			ph.catch_panic(move || {
-				match ws.listen(addr.clone()).map_err(ServerError::from) {
+				match ws.listen(addr).map_err(ServerError::from) {
 					Err(ServerError::IoError(io)) => die(format!(
 						"Signer: Could not start listening on specified address. Make sure that no other instance is running on Signer's port. Details: {:?}",
 						io

sync/Cargo.toml

@@ -17,7 +17,7 @@ ethcore-network = { path = "../util/network" }
 ethcore-io = { path = "../util/io" }
 ethcore = { path = "../ethcore" }
 rlp = { path = "../util/rlp" }
-clippy = { version = "0.0.85", optional = true}
+clippy = { version = "0.0.90", optional = true}
 log = "0.3"
 env_logger = "0.3"
 time = "0.1.34"

sync/src/chain.rs

@@ -807,7 +807,7 @@ impl ChainSync {
 		}
 
 		let manifest_rlp = try!(r.at(0));
-		let manifest = match ManifestData::from_rlp(&manifest_rlp.as_raw()) {
+		let manifest = match ManifestData::from_rlp(manifest_rlp.as_raw()) {
 			Err(e) => {
 				trace!(target: "sync", "{}: Ignored bad manifest: {:?}", peer_id, e);
 				io.disconnect_peer(peer_id);
@@ -995,7 +995,7 @@ impl ChainSync {
 						self.request_snapshot_data(io, peer_id);
 					}
 				},
-				SyncState::SnapshotManifest => (), //already downloading from other peer
+				SyncState::SnapshotManifest | //already downloading from other peer
 					SyncState::Waiting | SyncState::SnapshotWaiting => ()
 			}
 		}
@@ -1439,8 +1439,7 @@ impl ChainSync {
 			},
 			None => {
 				trace!(target: "sync", "{}: No manifest to return", peer_id);
-				let rlp = RlpStream::new_list(0);
+				RlpStream::new_list(0)
-				rlp
 			}
 		};
 		Ok(Some((SNAPSHOT_MANIFEST_PACKET, rlp)))
@@ -1457,8 +1456,7 @@ impl ChainSync {
 				rlp
 			},
 			None => {
-				let rlp = RlpStream::new_list(0);
+				RlpStream::new_list(0)
-				rlp
 			}
 		};
 		Ok(Some((SNAPSHOT_DATA_PACKET, rlp)))
@@ -1543,6 +1541,7 @@ impl ChainSync {
 		})
 	}
 
+	#[cfg_attr(feature="dev", allow(match_same_arms))]
 	pub fn maintain_peers(&mut self, io: &mut SyncIo) {
 		let tick = time::precise_time_s();
 		let mut aborting = Vec::new();
@@ -1712,7 +1711,7 @@ impl ChainSync {
 			return 0;
 		}
 
-		let all_transactions_hashes = transactions.iter().map(|ref tx| tx.hash()).collect::<HashSet<H256>>();
+		let all_transactions_hashes = transactions.iter().map(|tx| tx.hash()).collect::<HashSet<H256>>();
 		let all_transactions_rlp = {
 			let mut packet = RlpStream::new_list(transactions.len());
 			for tx in &transactions { packet.append(tx); }
@@ -1862,8 +1861,8 @@ mod tests {
 	fn return_receipts_empty() {
 		let mut client = TestBlockChainClient::new();
 		let mut queue = VecDeque::new();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let result = ChainSync::return_receipts(&io, &UntrustedRlp::new(&[0xc0]), 0);
 
@@ -1875,8 +1874,8 @@ mod tests {
 		let mut client = TestBlockChainClient::new();
 		let mut queue = VecDeque::new();
 		let sync = dummy_sync_with_peer(H256::new(), &client);
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let mut receipt_list = RlpStream::new_list(4);
 		receipt_list.append(&H256::from("0000000000000000000000000000000000000000000000005555555555555555"));
@@ -1931,8 +1930,8 @@ mod tests {
 		let hashes: Vec<_> = headers.iter().map(|h| HeaderView::new(h).sha3()).collect();
 
 		let mut queue = VecDeque::new();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let unknown: H256 = H256::new();
 		let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_hash_req(&unknown, 1, 0, false)), 0);
@@ -1970,8 +1969,8 @@ mod tests {
 		let mut client = TestBlockChainClient::new();
 		let mut queue = VecDeque::new();
 		let sync = dummy_sync_with_peer(H256::new(), &client);
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let mut node_list = RlpStream::new_list(3);
 		node_list.append(&H256::from("0000000000000000000000000000000000000000000000005555555555555555"));
@@ -2026,8 +2025,8 @@ mod tests {
 		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(10), &client);
 		let chain_info = client.chain_info();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let lagging_peers = sync.get_lagging_peers(&chain_info, &io);
 
@@ -2058,8 +2057,8 @@ mod tests {
 		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let chain_info = client.chain_info();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let peers = sync.get_lagging_peers(&chain_info, &io);
 		let peer_count = sync.propagate_new_hashes(&chain_info, &mut io, &peers);
@@ -2079,8 +2078,8 @@ mod tests {
 		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let chain_info = client.chain_info();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 		let peers = sync.get_lagging_peers(&chain_info, &io);
 		let peer_count = sync.propagate_blocks(&chain_info, &mut io, &[], &peers);
 
@@ -2100,8 +2099,8 @@ mod tests {
 		let hash = client.block_hash(BlockID::Number(99)).unwrap();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let chain_info = client.chain_info();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 		let peers = sync.get_lagging_peers(&chain_info, &io);
 		let peer_count = sync.propagate_blocks(&chain_info, &mut io, &[hash.clone()], &peers);
 
@@ -2120,8 +2119,8 @@ mod tests {
 		client.insert_transaction_to_queue();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(1), &client);
 		let mut queue = VecDeque::new();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 		let peer_count = sync.propagate_new_transactions(&mut io);
 		// Try to propagate same transactions for the second time
 		let peer_count2 = sync.propagate_new_transactions(&mut io);
@@ -2142,8 +2141,8 @@ mod tests {
 		client.insert_transaction_to_queue();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(1), &client);
 		let mut queue = VecDeque::new();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 		let peer_count = sync.propagate_new_transactions(&mut io);
 		sync.chain_new_blocks(&mut io, &[], &[], &[], &[], &[]);
 		// Try to propagate same transactions for the second time
@@ -2166,17 +2165,17 @@ mod tests {
 		client.insert_transaction_to_queue();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(1), &client);
 		let mut queue = VecDeque::new();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
 		// should sent some
 		{
-			let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+			let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 			let peer_count = sync.propagate_new_transactions(&mut io);
 			assert_eq!(1, io.queue.len());
 			assert_eq!(1, peer_count);
 		}
 		// Insert some more
 		client.insert_transaction_to_queue();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 		// Propagate new transactions
 		let peer_count2 = sync.propagate_new_transactions(&mut io);
 		// And now the peer should have all transactions
@@ -2202,8 +2201,8 @@ mod tests {
 		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		//sync.have_common_block = true;
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let block = UntrustedRlp::new(&block_data);
 
@@ -2221,8 +2220,8 @@ mod tests {
 
 		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let block = UntrustedRlp::new(&block_data);
 
@@ -2237,8 +2236,8 @@ mod tests {
 		client.add_blocks(10, EachBlockWith::Uncle);
 		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let empty_data = vec![];
 		let block = UntrustedRlp::new(&empty_data);
@@ -2254,8 +2253,8 @@ mod tests {
 		client.add_blocks(10, EachBlockWith::Uncle);
 		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let hashes_data = get_dummy_hashes();
 		let hashes_rlp = UntrustedRlp::new(&hashes_data);
@@ -2271,8 +2270,8 @@ mod tests {
 		client.add_blocks(10, EachBlockWith::Uncle);
 		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let empty_hashes_data = vec![];
 		let hashes_rlp = UntrustedRlp::new(&empty_hashes_data);
@@ -2291,8 +2290,8 @@ mod tests {
 		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let chain_info = client.chain_info();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let peers = sync.get_lagging_peers(&chain_info, &io);
 		sync.propagate_new_hashes(&chain_info, &mut io, &peers);
@@ -2311,8 +2310,8 @@ mod tests {
 		let mut queue = VecDeque::new();
 		let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
 		let chain_info = client.chain_info();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		let peers = sync.get_lagging_peers(&chain_info, &io);
 		sync.propagate_blocks(&chain_info, &mut io, &[], &peers);
@@ -2346,8 +2345,8 @@ mod tests {
 		// when
 		{
 			let mut queue = VecDeque::new();
-			let mut ss = TestSnapshotService::new();
+			let ss = TestSnapshotService::new();
-			let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+			let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 			io.chain.miner.chain_new_blocks(io.chain, &[], &[], &[], &good_blocks);
 			sync.chain_new_blocks(&mut io, &[], &[], &[], &good_blocks, &[]);
 			assert_eq!(io.chain.miner.status().transactions_in_future_queue, 0);
@@ -2361,8 +2360,8 @@ mod tests {
 		}
 		{
 			let mut queue = VecDeque::new();
-			let mut ss = TestSnapshotService::new();
+			let ss = TestSnapshotService::new();
-			let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+			let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 			io.chain.miner.chain_new_blocks(io.chain, &[], &[], &good_blocks, &retracted_blocks);
 			sync.chain_new_blocks(&mut io, &[], &[], &good_blocks, &retracted_blocks, &[]);
 		}
@@ -2386,8 +2385,8 @@ mod tests {
 		let retracted_blocks = vec![client.block_hash_delta_minus(1)];
 
 		let mut queue = VecDeque::new();
-		let mut ss = TestSnapshotService::new();
+		let ss = TestSnapshotService::new();
-		let mut io = TestIo::new(&mut client, &mut ss, &mut queue, None);
+		let mut io = TestIo::new(&mut client, &ss, &mut queue, None);
 
 		// when
 		sync.chain_new_blocks(&mut io, &[], &[], &[], &good_blocks, &[]);

sync/src/tests/snapshot.rs

@@ -74,14 +74,14 @@ impl SnapshotService for TestSnapshotService {
 	}
 
 	fn status(&self) -> RestorationStatus {
-		match &*self.restoration_manifest.lock() {
+		match *self.restoration_manifest.lock() {
-			&Some(ref manifest) if self.state_restoration_chunks.lock().len() == manifest.state_hashes.len() &&
+			Some(ref manifest) if self.state_restoration_chunks.lock().len() == manifest.state_hashes.len() &&
 				self.block_restoration_chunks.lock().len() == manifest.block_hashes.len() => RestorationStatus::Inactive,
-			&Some(_) => RestorationStatus::Ongoing {
+			Some(_) => RestorationStatus::Ongoing {
 				state_chunks_done: self.state_restoration_chunks.lock().len() as u32,
 				block_chunks_done: self.block_restoration_chunks.lock().len() as u32,
 			},
-			&None => RestorationStatus::Inactive,
+			None => RestorationStatus::Inactive,
 		}
 	}
 
@@ -98,13 +98,13 @@ impl SnapshotService for TestSnapshotService {
 	}
 
 	fn restore_state_chunk(&self, hash: H256, chunk: Bytes) {
-		if self.restoration_manifest.lock().as_ref().map_or(false, |ref m| m.state_hashes.iter().any(|h| h == &hash)) {
+		if self.restoration_manifest.lock().as_ref().map_or(false, |m| m.state_hashes.iter().any(|h| h == &hash)) {
 			self.state_restoration_chunks.lock().insert(hash, chunk);
 		}
 	}
 
 	fn restore_block_chunk(&self, hash: H256, chunk: Bytes) {
-		if self.restoration_manifest.lock().as_ref().map_or(false, |ref m| m.block_hashes.iter().any(|h| h == &hash)) {
+		if self.restoration_manifest.lock().as_ref().map_or(false, |m| m.block_hashes.iter().any(|h| h == &hash)) {
 			self.block_restoration_chunks.lock().insert(hash, chunk);
 		}
 	}

util/Cargo.toml

@@ -23,7 +23,7 @@ rlp = { path = "rlp" }
 heapsize = { version = "0.3", features = ["unstable"] }
 itertools = "0.4"
 sha3 = { path = "sha3" }
-clippy = { version = "0.0.85", optional = true}
+clippy = { version = "0.0.90", optional = true}
 ethcore-devtools = { path = "../devtools" }
 libc = "0.2.7"
 vergen = "0.1"

util/network/Cargo.toml

@@ -14,7 +14,7 @@ time = "0.1.34"
 tiny-keccak = "1.0"
 rust-crypto = "0.2.34"
 slab = "0.2"
-clippy = { version = "0.0.85", optional = true}
+clippy = { version = "0.0.90", optional = true}
 igd = "0.5.0"
 libc = "0.2.7"
 parking_lot = "0.2.6"

util/src/kvdb.rs

@@ -330,8 +330,8 @@ impl Database {
 
 	/// Commit buffered changes to database.
 	pub fn flush(&self) -> Result<(), String> {
-		match &*self.db.read() {
+		match *self.db.read() {
-			&Some(DBAndColumns { ref db, ref cfs }) => {
+			Some(DBAndColumns { ref db, ref cfs }) => {
 				let batch = WriteBatch::new();
 				let mut overlay = self.overlay.write();
 
@@ -366,15 +366,15 @@ impl Database {
 				}
 				db.write_opt(batch, &self.write_opts)
 			},
-			&None => Err("Database is closed".to_owned())
+			None => Err("Database is closed".to_owned())
 		}
 	}
 
 
 	/// Commit transaction to database.
 	pub fn write(&self, tr: DBTransaction) -> Result<(), String> {
-		match &*self.db.read() {
+		match *self.db.read() {
-			&Some(DBAndColumns { ref db, ref cfs }) => {
+			Some(DBAndColumns { ref db, ref cfs }) => {
 				let batch = WriteBatch::new();
 				let ops = tr.ops;
 				for op in ops {
@@ -393,14 +393,14 @@ impl Database {
 				}
 				db.write_opt(batch, &self.write_opts)
 			},
-			&None => Err("Database is closed".to_owned())
+			None => Err("Database is closed".to_owned())
 		}
 	}
 
 	/// Get value by key.
 	pub fn get(&self, col: Option<u32>, key: &[u8]) -> Result<Option<Bytes>, String> {
-		match &*self.db.read() {
+		match *self.db.read() {
-			&Some(DBAndColumns { ref db, ref cfs }) => {
+			Some(DBAndColumns { ref db, ref cfs }) => {
 				let overlay = &self.overlay.read()[Self::to_overlay_column(col)];
 				match overlay.get(key) {
 					Some(&KeyState::Insert(ref value)) | Some(&KeyState::InsertCompressed(ref value)) => Ok(Some(value.clone())),
@@ -412,15 +412,15 @@ impl Database {
 					},
 				}
 			},
-			&None => Ok(None),
+			None => Ok(None),
 		}
 	}
 
 	/// Get value by partial key. Prefix size should match configured prefix size. Only searches flushed values.
 	// TODO: support prefix seek for unflushed data
 	pub fn get_by_prefix(&self, col: Option<u32>, prefix: &[u8]) -> Option<Box<[u8]>> {
-		match &*self.db.read() {
+		match *self.db.read() {
-			&Some(DBAndColumns { ref db, ref cfs }) => {
+			Some(DBAndColumns { ref db, ref cfs }) => {
 				let mut iter = col.map_or_else(|| db.iterator(IteratorMode::From(prefix, Direction::Forward)),
 					|c| db.iterator_cf(cfs[c as usize], IteratorMode::From(prefix, Direction::Forward)).unwrap());
 				match iter.next() {
@@ -429,19 +429,19 @@ impl Database {
 					_ => None
 				}
 			},
-			&None => None,
+			None => None,
 		}
 	}
 
 	/// Get database iterator for flushed data.
 	pub fn iter(&self, col: Option<u32>) -> DatabaseIterator {
 		//TODO: iterate over overlay
-		match &*self.db.read() {
+		match *self.db.read() {
-			&Some(DBAndColumns { ref db, ref cfs }) => {
+			Some(DBAndColumns { ref db, ref cfs }) => {
 				col.map_or_else(|| DatabaseIterator { iter: db.iterator(IteratorMode::Start) },
 					|c| DatabaseIterator { iter: db.iterator_cf(cfs[c as usize], IteratorMode::Start).unwrap() })
 			},
-			&None => panic!("Not supported yet") //TODO: return an empty iterator or change return type
+			None => panic!("Not supported yet") //TODO: return an empty iterator or change return type
 		}
 	}
 

util/src/trie/recorder.rs

@@ -63,6 +63,12 @@ pub struct BasicRecorder {
 	min_depth: u32,
 }
 
+impl Default for BasicRecorder {
+	fn default() -> Self {
+		BasicRecorder::new()
+	}
+}
+
 impl BasicRecorder {
 	/// Create a new `BasicRecorder` which records all given nodes.
 	#[inline]

util/src/trie/triedb.rs

@@ -128,7 +128,7 @@ impl<'db> TrieDB<'db> {
 	}
 
 	/// Get the root node's RLP.
-	fn root_node<'a, R: 'a + Recorder>(&self, r: &'a mut R) -> super::Result<Node> {
+	fn root_node<R: Recorder>(&self, r: &mut R) -> super::Result<Node> {
 		self.root_data(r).map(Node::decoded)
 	}