diff --git a/dapps/src/tests/helpers/mod.rs b/dapps/src/tests/helpers/mod.rs
index 4ee21c8f4..81ed5ed41 100644
--- a/dapps/src/tests/helpers/mod.rs
+++ b/dapps/src/tests/helpers/mod.rs
@@ -268,7 +268,7 @@ impl Server {
 		};
 
 		let mut allowed_hosts: Option<Vec<Host>> = allowed_hosts.into();
-		allowed_hosts.as_mut().map(|mut hosts| {
+		allowed_hosts.as_mut().map(|hosts| {
 			hosts.push(format!("http://*.{}:*", DAPPS_DOMAIN).into());
 			hosts.push(format!("http://*.{}", DAPPS_DOMAIN).into());
 		});
diff --git a/ethcore/src/machine.rs b/ethcore/src/machine.rs
index 2536384e6..667211c52 100644
--- a/ethcore/src/machine.rs
+++ b/ethcore/src/machine.rs
@@ -263,7 +263,7 @@ impl EthereumMachine {
 				} else if block_number < ext.eip150_transition {
 					Schedule::new_homestead()
 				} else {
-					/// There's no max_code_size transition so we tie it to eip161abc
+					// There's no max_code_size transition so we tie it to eip161abc
 					let max_code_size = if block_number >= ext.eip161abc_transition {
 						self.params.max_code_size as usize
 					} else {
diff --git a/ethkey/src/extended.rs b/ethkey/src/extended.rs
index 45ed0547f..c545cd3e4 100644
--- a/ethkey/src/extended.rs
+++ b/ethkey/src/extended.rs
@@ -477,8 +477,8 @@ mod tests {
 			.expect("Seed should be valid H128")
 			.to_vec();
 
-		/// private key from bitcoin test vector
-		/// xprv9wTYmMFdV23N2TdNG573QoEsfRrWKQgWeibmLntzniatZvR9BmLnvSxqu53Kw1UmYPxLgboyZQaXwTCg8MSY3H2EU4pWcQDnRnrVA1xe8fs
+		// private key from bitcoin test vector
+		// xprv9wTYmMFdV23N2TdNG573QoEsfRrWKQgWeibmLntzniatZvR9BmLnvSxqu53Kw1UmYPxLgboyZQaXwTCg8MSY3H2EU4pWcQDnRnrVA1xe8fs
 		let test_private = H256::from_str("e8f32e723decf4051aefac8e2c93c9c5b214313817cdb01a1494b917c8436b35")
 			.expect("Private should be decoded ok");
 
@@ -489,8 +489,8 @@ mod tests {
 
 	#[test]
 	fn test_vector_1() {
-		/// xprv9uHRZZhk6KAJC1avXpDAp4MDc3sQKNxDiPvvkX8Br5ngLNv1TxvUxt4cV1rGL5hj6KCesnDYUhd7oWgT11eZG7XnxHrnYeSvkzY7d2bhkJ7
-		/// H(0)
+		// xprv9uHRZZhk6KAJC1avXpDAp4MDc3sQKNxDiPvvkX8Br5ngLNv1TxvUxt4cV1rGL5hj6KCesnDYUhd7oWgT11eZG7XnxHrnYeSvkzY7d2bhkJ7
+		// H(0)
 		test_extended(
 			|secret| secret.derive(2147483648.into()),
 			H256::from_str("edb2e14f9ee77d26dd93b4ecede8d16ed408ce149b6cd80b0715a2d911a0afea")
@@ -500,8 +500,8 @@ mod tests {
 
 	#[test]
 	fn test_vector_2() {
-		/// xprv9wTYmMFdV23N2TdNG573QoEsfRrWKQgWeibmLntzniatZvR9BmLnvSxqu53Kw1UmYPxLgboyZQaXwTCg8MSY3H2EU4pWcQDnRnrVA1xe8fs
-		/// H(0)/1
+		// xprv9wTYmMFdV23N2TdNG573QoEsfRrWKQgWeibmLntzniatZvR9BmLnvSxqu53Kw1UmYPxLgboyZQaXwTCg8MSY3H2EU4pWcQDnRnrVA1xe8fs
+		// H(0)/1
 		test_extended(
 			|secret| secret.derive(2147483648.into()).derive(1.into()),
 			H256::from_str("3c6cb8d0f6a264c91ea8b5030fadaa8e538b020f0a387421a12de9319dc93368")
diff --git a/hw/src/trezor.rs b/hw/src/trezor.rs
index a89d26f66..239968120 100644
--- a/hw/src/trezor.rs
+++ b/hw/src/trezor.rs
@@ -201,7 +201,7 @@ impl Manager {
 		where F: Fn() -> Result<R, &'static str>
 	{
 		let mut err = Error::KeyNotFound;
-		/// Try to open device a few times.
+		// Try to open device a few times.
 		for _ in 0..10 {
 			match f() {
 				Ok(handle) => return Ok(handle),
diff --git a/rpc/src/v1/tests/mocked/eth.rs b/rpc/src/v1/tests/mocked/eth.rs
index 96329d18c..337ef9513 100644
--- a/rpc/src/v1/tests/mocked/eth.rs
+++ b/rpc/src/v1/tests/mocked/eth.rs
@@ -471,7 +471,7 @@ fn rpc_eth_transaction_count() {
 
 #[test]
 fn rpc_eth_transaction_count_next_nonce() {
-	let tester = EthTester::new_with_options(EthClientOptions::with(|mut options| {
+	let tester = EthTester::new_with_options(EthClientOptions::with(|options| {
 		options.pending_nonce_from_queue = true;
 	}));
 	tester.miner.increment_last_nonce(1.into());
@@ -1104,7 +1104,7 @@ fn rpc_get_work_returns_correct_work_package() {
 
 #[test]
 fn rpc_get_work_should_not_return_block_number() {
-	let eth_tester = EthTester::new_with_options(EthClientOptions::with(|mut options| {
+	let eth_tester = EthTester::new_with_options(EthClientOptions::with(|options| {
 		options.send_block_number_in_get_work = false;
 	}));
 	eth_tester.miner.set_author(Address::from_str("d46e8dd67c5d32be8058bb8eb970870f07244567").unwrap());
diff --git a/secret_store/src/key_server_cluster/admin_sessions/share_move_session.rs b/secret_store/src/key_server_cluster/admin_sessions/share_move_session.rs
index a19a9eee0..d193e9efd 100644
--- a/secret_store/src/key_server_cluster/admin_sessions/share_move_session.rs
+++ b/secret_store/src/key_server_cluster/admin_sessions/share_move_session.rs
@@ -419,7 +419,7 @@ impl<T> SessionImpl<T> where T: SessionTransport {
 
 		// find share source
 		{
-			let mut move_confirmations_to_receive = data.move_confirmations_to_receive.as_mut()
+			let move_confirmations_to_receive = data.move_confirmations_to_receive.as_mut()
 				.expect("move_confirmations_to_receive are filled during consensus establishing; move confirmations are processed after this; qed");
 			if !move_confirmations_to_receive.remove(sender) {
 				return Err(Error::InvalidMessage);
diff --git a/util/table/src/lib.rs b/util/table/src/lib.rs
index bef453426..78b2c646a 100644
--- a/util/table/src/lib.rs
+++ b/util/table/src/lib.rs
@@ -247,7 +247,7 @@ mod test {
 
 		// when
 		{
-			let mut row = table.row_mut(&1).unwrap();
+			let row = table.row_mut(&1).unwrap();
 			row.remove(&1);
 			row.remove(&2);
 		}