diff --git a/substrate/client/transaction-pool/graph/src/base_pool.rs b/substrate/client/transaction-pool/graph/src/base_pool.rs
index 445ef0adaf..9b644bbdb3 100644
--- a/substrate/client/transaction-pool/graph/src/base_pool.rs
+++ b/substrate/client/transaction-pool/graph/src/base_pool.rs
@@ -155,13 +155,13 @@ impl<Hash: Clone, Extrinsic: Clone> Transaction<Hash, Extrinsic> {
 	/// every reason to be commented. That's why we `Transaction` is not `Clone`,
 	/// but there's explicit `duplicate` method.
 	pub fn duplicate(&self) -> Self {
-		Transaction {
+		Self {
 			data: self.data.clone(),
-			bytes: self.bytes.clone(),
+			bytes: self.bytes,
 			hash: self.hash.clone(),
-			priority: self.priority.clone(),
+			priority: self.priority,
 			source: self.source,
-			valid_till: self.valid_till.clone(),
+			valid_till: self.valid_till,
 			requires: self.requires.clone(),
 			provides: self.provides.clone(),
 			propagate: self.propagate,
@@ -174,16 +174,9 @@ impl<Hash, Extrinsic> fmt::Debug for Transaction<Hash, Extrinsic> where
 	Extrinsic: fmt::Debug,
 {
 	fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-		fn print_tags(fmt: &mut fmt::Formatter, tags: &[Tag]) -> fmt::Result {
-			let mut it = tags.iter();
-			if let Some(t) = it.next() {
-				write!(fmt, "{}", HexDisplay::from(t))?;
-			}
-			for t in it {
-				write!(fmt, ",{}", HexDisplay::from(t))?;
-			}
-			Ok(())
-		}
+		let join_tags = |tags: &[Tag]| {
+			tags.iter().map(|tag| HexDisplay::from(tag).to_string()).collect::<Vec<_>>().join(", ")
+		};
 
 		write!(fmt, "Transaction {{ ")?;
 		write!(fmt, "hash: {:?}, ", &self.hash)?;
@@ -192,11 +185,8 @@ impl<Hash, Extrinsic> fmt::Debug for Transaction<Hash, Extrinsic> where
 		write!(fmt, "bytes: {:?}, ", &self.bytes)?;
 		write!(fmt, "propagate: {:?}, ", &self.propagate)?;
 		write!(fmt, "source: {:?}, ", &self.source)?;
-		write!(fmt, "requires: [")?;
-		print_tags(fmt, &self.requires)?;
-		write!(fmt, "], provides: [")?;
-		print_tags(fmt, &self.provides)?;
-		write!(fmt, "], ")?;
+		write!(fmt, "requires: [{}], ", join_tags(&self.requires))?;
+		write!(fmt, "provides: [{}], ", join_tags(&self.provides))?;
 		write!(fmt, "data: {:?}", &self.data)?;
 		write!(fmt, "}}")?;
 		Ok(())
@@ -239,7 +229,7 @@ impl<Hash: hash::Hash + Member + Serialize, Ex: std::fmt::Debug> Default for Bas
 impl<Hash: hash::Hash + Member + Serialize, Ex: std::fmt::Debug> BasePool<Hash, Ex> {
 	/// Create new pool given reject_future_transactions flag.
 	pub fn new(reject_future_transactions: bool) -> Self {
-		BasePool {
+		Self {
 			reject_future_transactions,
 			future: Default::default(),
 			ready: Default::default(),
@@ -320,13 +310,8 @@ impl<Hash: hash::Hash + Member + Serialize, Ex: std::fmt::Debug> BasePool<Hash,
 		let mut first = true;
 		let mut to_import = vec![tx];
 
-		loop {
-			// take first transaction from the list
-			let tx = match to_import.pop() {
-				Some(tx) => tx,
-				None => break,
-			};
-
+		// take first transaction from the list
+		while let Some(tx) = to_import.pop() {
 			// find transactions in Future that it unlocks
 			to_import.append(&mut self.future.satisfy_tags(&tx.transaction.provides));
 
@@ -1087,7 +1072,7 @@ mod tests {
 			}),
 			"Transaction { \
 hash: 4, priority: 1000, valid_till: 64, bytes: 1, propagate: true, \
-source: TransactionSource::External, requires: [03,02], provides: [04], data: [4]}".to_owned()
+source: TransactionSource::External, requires: [03, 02], provides: [04], data: [4]}".to_owned()
 		);
 	}
 
diff --git a/substrate/client/transaction-pool/graph/src/future.rs b/substrate/client/transaction-pool/graph/src/future.rs
index 98d49817e3..9dcfd13808 100644
--- a/substrate/client/transaction-pool/graph/src/future.rs
+++ b/substrate/client/transaction-pool/graph/src/future.rs
@@ -47,24 +47,22 @@ impl<Hash: fmt::Debug, Ex: fmt::Debug> fmt::Debug for WaitingTransaction<Hash, E
 		write!(fmt, "WaitingTransaction {{ ")?;
 		write!(fmt, "imported_at: {:?}, ", self.imported_at)?;
 		write!(fmt, "transaction: {:?}, ", self.transaction)?;
-		write!(fmt, "missing_tags: {{")?;
-		let mut it = self.missing_tags.iter().map(|tag| HexDisplay::from(tag));
-		if let Some(tag) = it.next() {
-			write!(fmt, "{}", tag)?;
-		}
-		for tag in it {
-			write!(fmt, ", {}", tag)?;
-		}
-		write!(fmt, " }}}}")
+		write!(
+			fmt, 
+			"missing_tags: {{{}}}", 
+			self.missing_tags.iter()
+				.map(|tag| HexDisplay::from(tag).to_string()).collect::<Vec<_>>().join(", "),
+		)?;
+		write!(fmt, "}}")
 	}
 }
 
 impl<Hash, Ex> Clone for WaitingTransaction<Hash, Ex> {
 	fn clone(&self) -> Self {
-		WaitingTransaction {
+		Self {
 			transaction: self.transaction.clone(),
 			missing_tags: self.missing_tags.clone(),
-			imported_at: self.imported_at.clone(),
+			imported_at: self.imported_at,
 		}
 	}
 }
@@ -90,7 +88,7 @@ impl<Hash, Ex> WaitingTransaction<Hash, Ex> {
 			.cloned()
 			.collect();
 
-		WaitingTransaction {
+		Self {
 			transaction: Arc::new(transaction),
 			missing_tags,
 			imported_at: Instant::now(),
@@ -123,7 +121,7 @@ pub struct FutureTransactions<Hash: hash::Hash + Eq, Ex> {
 
 impl<Hash: hash::Hash + Eq, Ex> Default for FutureTransactions<Hash, Ex> {
 	fn default() -> Self {
-		FutureTransactions {
+		Self {
 			wanted_tags: Default::default(),
 			waiting: Default::default(),
 		}
diff --git a/substrate/client/transaction-pool/graph/src/listener.rs b/substrate/client/transaction-pool/graph/src/listener.rs
index d707c0a0f8..563243bf45 100644
--- a/substrate/client/transaction-pool/graph/src/listener.rs
+++ b/substrate/client/transaction-pool/graph/src/listener.rs
@@ -20,12 +20,14 @@
 use std::{
 	collections::HashMap, hash, fmt::Debug,
 };
+
 use linked_hash_map::LinkedHashMap;
 use serde::Serialize;
-use crate::{watcher, ChainApi, ExtrinsicHash, BlockHash};
 use log::{debug, trace, warn};
 use sp_runtime::traits;
 
+use crate::{watcher, ChainApi, ExtrinsicHash, BlockHash};
+
 /// Extrinsic pool default listener.
 pub struct Listener<H: hash::Hash + Eq, C: ChainApi> {
 	watchers: HashMap<H, watcher::Sender<H, ExtrinsicHash<C>>>,
@@ -37,7 +39,7 @@ const MAX_FINALITY_WATCHERS: usize = 512;
 
 impl<H: hash::Hash + Eq + Debug, C: ChainApi> Default for Listener<H, C> {
 	fn default() -> Self {
-		Listener {
+		Self {
 			watchers: Default::default(),
 			finality_watchers: Default::default(),
 		}
@@ -115,7 +117,7 @@ impl<H: hash::Hash + traits::Member + Serialize, C: ChainApi> Listener<H, C> {
 		while self.finality_watchers.len() > MAX_FINALITY_WATCHERS {
 			if let Some((hash, txs)) = self.finality_watchers.pop_front() {
 				for tx in txs {
-					self.fire(&tx, |s| s.finality_timeout(hash.clone()));
+					self.fire(&tx, |s| s.finality_timeout(hash));
 				}
 			}
 		}
diff --git a/substrate/client/transaction-pool/graph/src/pool.rs b/substrate/client/transaction-pool/graph/src/pool.rs
index eee14049d4..8a60ea80bc 100644
--- a/substrate/client/transaction-pool/graph/src/pool.rs
+++ b/substrate/client/transaction-pool/graph/src/pool.rs
@@ -21,8 +21,6 @@ use std::{
 	sync::Arc,
 };
 
-use crate::{base_pool as base, watcher::Watcher};
-
 use futures::Future;
 use sp_runtime::{
 	generic::BlockId,
@@ -35,6 +33,7 @@ use sp_transaction_pool::error;
 use wasm_timer::Instant;
 use futures::channel::mpsc::Receiver;
 
+use crate::{base_pool as base, watcher::Watcher};
 use crate::validated_pool::ValidatedPool;
 pub use crate::validated_pool::{IsValidator, ValidatedTransaction};
 
@@ -111,7 +110,7 @@ pub struct Options {
 
 impl Default for Options {
 	fn default() -> Self {
-		Options {
+		Self {
 			ready: base::Limit {
 				count: 8192,
 				total_bytes: 20 * 1024 * 1024,
@@ -151,7 +150,7 @@ where
 impl<B: ChainApi> Pool<B> {
 	/// Create a new transaction pool.
 	pub fn new(options: Options, is_validator: IsValidator, api: Arc<B>) -> Self {
-		Pool {
+		Self {
 			validated_pool: Arc::new(ValidatedPool::new(options, is_validator, api)),
 		}
 	}
@@ -193,7 +192,7 @@ impl<B: ChainApi> Pool<B> {
 		res.expect("One extrinsic passed; one result returned; qed")
 	}
 
-	/// Import a single extrinsic and starts to watch their progress in the pool.
+	/// Import a single extrinsic and starts to watch its progress in the pool.
 	pub async fn submit_and_watch(
 		&self,
 		at: &BlockId<B::Block>,
@@ -242,8 +241,8 @@ impl<B: ChainApi> Pool<B> {
 
 		// Prune all transactions that provide given tags
 		let prune_status = self.validated_pool.prune_tags(in_pool_tags)?;
-		let pruned_transactions = hashes.into_iter().cloned()
-			.chain(prune_status.pruned.iter().map(|tx| tx.hash.clone()));
+		let pruned_transactions = hashes.iter().cloned()
+			.chain(prune_status.pruned.iter().map(|tx| tx.hash));
 		self.validated_pool.fire_pruned(at, pruned_transactions)
 	}
 
@@ -337,7 +336,7 @@ impl<B: ChainApi> Pool<B> {
 		// note that `known_imported_hashes` will be rejected here due to temporary ban.
 		let pruned_hashes = prune_status.pruned
 			.iter()
-			.map(|tx| tx.hash.clone()).collect::<Vec<_>>();
+			.map(|tx| tx.hash).collect::<Vec<_>>();
 		let pruned_transactions = prune_status.pruned
 			.into_iter()
 			.map(|tx| (tx.source, tx.data.clone()));
@@ -402,7 +401,7 @@ impl<B: ChainApi> Pool<B> {
 
 		let ignore_banned = matches!(check, CheckBannedBeforeVerify::No);
 		if let Err(err) = self.validated_pool.check_is_known(&hash, ignore_banned) {
-			return (hash.clone(), ValidatedTransaction::Invalid(hash, err.into()))
+			return (hash, ValidatedTransaction::Invalid(hash, err))
 		}
 
 		let validation_result = self.validated_pool.api().validate_transaction(
@@ -413,17 +412,17 @@ impl<B: ChainApi> Pool<B> {
 
 		let status = match validation_result {
 			Ok(status) => status,
-			Err(e) => return (hash.clone(), ValidatedTransaction::Invalid(hash, e)),
+			Err(e) => return (hash, ValidatedTransaction::Invalid(hash, e)),
 		};
 
 		let validity = match status {
 			Ok(validity) => {
 				if validity.provides.is_empty() {
-					ValidatedTransaction::Invalid(hash.clone(), error::Error::NoTagsProvided.into())
+					ValidatedTransaction::Invalid(hash, error::Error::NoTagsProvided.into())
 				} else {
 					ValidatedTransaction::valid_at(
 						block_number.saturated_into::<u64>(),
-						hash.clone(),
+						hash,
 						source,
 						xt,
 						bytes,
@@ -432,9 +431,9 @@ impl<B: ChainApi> Pool<B> {
 				}
 			},
 			Err(TransactionValidityError::Invalid(e)) =>
-				ValidatedTransaction::Invalid(hash.clone(), error::Error::InvalidTransaction(e).into()),
+				ValidatedTransaction::Invalid(hash, error::Error::InvalidTransaction(e).into()),
 			Err(TransactionValidityError::Unknown(e)) =>
-				ValidatedTransaction::Unknown(hash.clone(), error::Error::UnknownTransaction(e).into()),
+				ValidatedTransaction::Unknown(hash, error::Error::UnknownTransaction(e).into()),
 		};
 
 		(hash, validity)
diff --git a/substrate/client/transaction-pool/graph/src/ready.rs b/substrate/client/transaction-pool/graph/src/ready.rs
index c2af4f9cb9..4ede9241d8 100644
--- a/substrate/client/transaction-pool/graph/src/ready.rs
+++ b/substrate/client/transaction-pool/graph/src/ready.rs
@@ -50,7 +50,7 @@ pub struct TransactionRef<Hash, Ex> {
 
 impl<Hash, Ex> Clone for TransactionRef<Hash, Ex> {
 	fn clone(&self) -> Self {
-		TransactionRef {
+		Self {
 			transaction: self.transaction.clone(),
 			insertion_id: self.insertion_id,
 		}
@@ -93,7 +93,7 @@ pub struct ReadyTx<Hash, Ex> {
 
 impl<Hash: Clone, Ex> Clone for ReadyTx<Hash, Ex> {
 	fn clone(&self) -> Self {
-		ReadyTx {
+		Self {
 			transaction: self.transaction.clone(),
 			unlocks: self.unlocks.clone(),
 			requires_offset: self.requires_offset,
@@ -128,7 +128,7 @@ impl<Hash, Ex> tracked_map::Size for ReadyTx<Hash, Ex> {
 
 impl<Hash: hash::Hash + Eq, Ex> Default for ReadyTransactions<Hash, Ex> {
 	fn default() -> Self {
-		ReadyTransactions {
+		Self {
 			insertion_id: Default::default(),
 			provided_tags: Default::default(),
 			ready: Default::default(),
@@ -259,7 +259,7 @@ impl<Hash: hash::Hash + Member + Serialize, Ex> ReadyTransactions<Hash, Ex> {
 	/// (i.e. the entire subgraph that this transaction is a start of will be removed).
 	/// All removed transactions are returned.
 	pub fn remove_subtree(&mut self, hashes: &[Hash]) -> Vec<Arc<Transaction<Hash, Ex>>> {
-		let to_remove = hashes.iter().cloned().collect::<Vec<_>>();
+		let to_remove = hashes.to_vec();
 		self.remove_subtree_with_tag_filter(to_remove, None)
 	}
 
diff --git a/substrate/client/transaction-pool/graph/src/rotator.rs b/substrate/client/transaction-pool/graph/src/rotator.rs
index 3d9b359fd3..4c800c7671 100644
--- a/substrate/client/transaction-pool/graph/src/rotator.rs
+++ b/substrate/client/transaction-pool/graph/src/rotator.rs
@@ -48,7 +48,7 @@ pub struct PoolRotator<Hash> {
 
 impl<Hash: hash::Hash + Eq> Default for PoolRotator<Hash> {
 	fn default() -> Self {
-		PoolRotator {
+		Self {
 			ban_time: Duration::from_secs(60 * 30),
 			banned_until: Default::default(),
 		}
@@ -78,7 +78,6 @@ impl<Hash: hash::Hash + Eq + Clone> PoolRotator<Hash> {
 		}
 	}
 
-
 	/// Bans extrinsic if it's stale.
 	///
 	/// Returns `true` if extrinsic is stale and got banned.
diff --git a/substrate/client/transaction-pool/graph/src/tracked_map.rs b/substrate/client/transaction-pool/graph/src/tracked_map.rs
index 9cd6ad84b4..98fd9e21b3 100644
--- a/substrate/client/transaction-pool/graph/src/tracked_map.rs
+++ b/substrate/client/transaction-pool/graph/src/tracked_map.rs
@@ -22,7 +22,7 @@ use std::{
 };
 use parking_lot::{RwLock, RwLockWriteGuard, RwLockReadGuard};
 
-/// Something that can report it's size.
+/// Something that can report its size.
 pub trait Size {
 	fn size(&self) -> usize;
 }
@@ -64,14 +64,14 @@ impl<K, V> TrackedMap<K, V> {
 	}
 
 	/// Lock map for read.
-	pub fn read<'a>(&'a self) -> TrackedMapReadAccess<'a, K, V> {
+	pub fn read(&self) -> TrackedMapReadAccess<K, V> {
 		TrackedMapReadAccess {
 			inner_guard: self.index.read(),
 		}
 	}
 
 	/// Lock map for write.
-	pub fn write<'a>(&'a self) -> TrackedMapWriteAccess<'a, K, V> {
+	pub fn write(&self) -> TrackedMapWriteAccess<K, V> {
 		TrackedMapWriteAccess {
 			inner_guard: self.index.write(),
 			bytes: &self.bytes,
@@ -90,7 +90,7 @@ where
 	K: Eq + std::hash::Hash
 {
 	/// Lock map for read.
-	pub fn read<'a>(&'a self) -> TrackedMapReadAccess<'a, K, V> {
+	pub fn read(&self) -> TrackedMapReadAccess<K, V> {
 		TrackedMapReadAccess {
 			inner_guard: self.0.read(),
 		}
@@ -136,10 +136,10 @@ where
 		let new_bytes = val.size();
 		self.bytes.fetch_add(new_bytes as isize, AtomicOrdering::Relaxed);
 		self.length.fetch_add(1, AtomicOrdering::Relaxed);
-		self.inner_guard.insert(key, val).and_then(|old_val| {
+		self.inner_guard.insert(key, val).map(|old_val| {
 			self.bytes.fetch_sub(old_val.size() as isize, AtomicOrdering::Relaxed);
 			self.length.fetch_sub(1, AtomicOrdering::Relaxed);
-			Some(old_val)
+			old_val
 		})
 	}
 
@@ -186,4 +186,4 @@ mod tests {
 		assert_eq!(map.bytes(), 1);
 		assert_eq!(map.len(), 1);
 	}
-}
\ No newline at end of file
+}
diff --git a/substrate/client/transaction-pool/graph/src/validated_pool.rs b/substrate/client/transaction-pool/graph/src/validated_pool.rs
index c02aab47d8..6042189e87 100644
--- a/substrate/client/transaction-pool/graph/src/validated_pool.rs
+++ b/substrate/client/transaction-pool/graph/src/validated_pool.rs
@@ -22,12 +22,7 @@ use std::{
 	sync::Arc,
 };
 
-use crate::base_pool as base;
-use crate::listener::Listener;
-use crate::rotator::PoolRotator;
-use crate::watcher::Watcher;
 use serde::Serialize;
-
 use parking_lot::{Mutex, RwLock};
 use sp_runtime::{
 	generic::BlockId,
@@ -39,7 +34,10 @@ use wasm_timer::Instant;
 use futures::channel::mpsc::{channel, Sender};
 use retain_mut::RetainMut;
 
-use crate::base_pool::PruneStatus;
+use crate::base_pool::{self as base, PruneStatus};
+use crate::listener::Listener;
+use crate::rotator::PoolRotator;
+use crate::watcher::Watcher;
 use crate::pool::{
 	EventStream, Options, ChainApi, BlockHash, ExtrinsicHash, ExtrinsicFor, TransactionFor,
 };
@@ -95,13 +93,13 @@ pub struct IsValidator(Box<dyn Fn() -> bool + Send + Sync>);
 
 impl From<bool> for IsValidator {
 	fn from(is_validator: bool) -> Self {
-		IsValidator(Box::new(move || is_validator))
+		Self(Box::new(move || is_validator))
 	}
 }
 
 impl From<Box<dyn Fn() -> bool + Send + Sync>> for IsValidator {
 	fn from(is_validator: Box<dyn Fn() -> bool + Send + Sync>) -> Self {
-		IsValidator(is_validator)
+		Self(is_validator)
 	}
 }
 
@@ -134,7 +132,7 @@ impl<B: ChainApi> ValidatedPool<B> {
 	/// Create a new transaction pool.
 	pub fn new(options: Options, is_validator: IsValidator, api: Arc<B>) -> Self {
 		let base_pool = base::BasePool::new(options.reject_future_transactions);
-		ValidatedPool {
+		Self {
 			is_validator,
 			options,
 			listener: Default::default(),
@@ -168,7 +166,7 @@ impl<B: ChainApi> ValidatedPool<B> {
 		if !ignore_banned && self.is_banned(tx_hash) {
 			Err(error::Error::TemporarilyBanned.into())
 		} else if self.pool.read().is_imported(tx_hash) {
-			Err(error::Error::AlreadyImported(Box::new(tx_hash.clone())).into())
+			Err(error::Error::AlreadyImported(Box::new(*tx_hash)).into())
 		} else {
 			Ok(())
 		}
@@ -209,7 +207,7 @@ impl<B: ChainApi> ValidatedPool<B> {
 				if let base::Imported::Ready { ref hash, .. } = imported {
 					self.import_notification_sinks.lock()
 						.retain_mut(|sink| {
-							match sink.try_send(hash.clone()) {
+							match sink.try_send(*hash) {
 								Ok(()) => true,
 								Err(e) => {
 									if e.is_full() {
@@ -225,15 +223,15 @@ impl<B: ChainApi> ValidatedPool<B> {
 
 				let mut listener = self.listener.write();
 				fire_events(&mut *listener, &imported);
-				Ok(imported.hash().clone())
+				Ok(*imported.hash())
 			},
 			ValidatedTransaction::Invalid(hash, err) => {
 				self.rotator.ban(&Instant::now(), std::iter::once(hash));
-				Err(err.into())
+				Err(err)
 			},
 			ValidatedTransaction::Unknown(hash, err) => {
 				self.listener.write().invalid(&hash, false);
-				Err(err.into())
+				Err(err)
 			},
 		}
 	}
@@ -258,9 +256,9 @@ impl<B: ChainApi> ValidatedPool<B> {
 			let removed = {
 				let mut pool = self.pool.write();
 				let removed = pool.enforce_limits(ready_limit, future_limit)
-					.into_iter().map(|x| x.hash.clone()).collect::<HashSet<_>>();
+					.into_iter().map(|x| x.hash).collect::<HashSet<_>>();
 				// ban all removed transactions
-				self.rotator.ban(&Instant::now(), removed.iter().map(|x| x.clone()));
+				self.rotator.ban(&Instant::now(), removed.iter().copied());
 				removed
 			};
 			if !removed.is_empty() {
@@ -295,9 +293,9 @@ impl<B: ChainApi> ValidatedPool<B> {
 			},
 			ValidatedTransaction::Invalid(hash, err) => {
 				self.rotator.ban(&Instant::now(), std::iter::once(hash));
-				Err(err.into())
+				Err(err)
 			},
-			ValidatedTransaction::Unknown(_, err) => Err(err.into()),
+			ValidatedTransaction::Unknown(_, err) => Err(err),
 		}
 	}
 
@@ -327,9 +325,9 @@ impl<B: ChainApi> ValidatedPool<B> {
 				// note we are not considering tx with hash invalid here - we just want
 				// to remove it along with dependent transactions and `remove_subtree()`
 				// does exactly what we need
-				let removed = pool.remove_subtree(&[hash.clone()]);
+				let removed = pool.remove_subtree(&[hash]);
 				for removed_tx in removed {
-					let removed_hash = removed_tx.hash.clone();
+					let removed_hash = removed_tx.hash;
 					let updated_transaction = updated_transactions.remove(&removed_hash);
 					let tx_to_resubmit = if let Some(updated_tx) = updated_transaction {
 						updated_tx
@@ -343,7 +341,7 @@ impl<B: ChainApi> ValidatedPool<B> {
 						ValidatedTransaction::Valid(transaction)
 					};
 
-					initial_statuses.insert(removed_hash.clone(), Status::Ready);
+					initial_statuses.insert(removed_hash, Status::Ready);
 					txs_to_resubmit.push((removed_hash, tx_to_resubmit));
 				}
 				// make sure to remove the hash even if it's not present in the pool any more.
@@ -370,7 +368,7 @@ impl<B: ChainApi> ValidatedPool<B> {
 										final_statuses.insert(hash, Status::Failed);
 									}
 									for tx in removed {
-										final_statuses.insert(tx.hash.clone(), Status::Dropped);
+										final_statuses.insert(tx.hash, Status::Dropped);
 									}
 								},
 								base::Imported::Future { .. } => {
@@ -400,7 +398,7 @@ impl<B: ChainApi> ValidatedPool<B> {
 				// queue, updating final statuses as required
 				if reject_future_transactions {
 					for future_tx in pool.clear_future() {
-						final_statuses.insert(future_tx.hash.clone(), Status::Dropped);
+						final_statuses.insert(future_tx.hash, Status::Dropped);
 					}
 				}
 
@@ -428,7 +426,7 @@ impl<B: ChainApi> ValidatedPool<B> {
 		self.pool.read().by_hashes(&hashes)
 			.into_iter()
 			.map(|existing_in_pool| existing_in_pool
-				.map(|transaction| transaction.provides.iter().cloned().collect()))
+				.map(|transaction| transaction.provides.to_vec()))
 			.collect()
 	}
 
@@ -477,7 +475,7 @@ impl<B: ChainApi> ValidatedPool<B> {
 			.into_iter()
 			.enumerate()
 			.filter_map(|(idx, r)| match r.map_err(error::IntoPoolError::into_pool_error) {
-				Err(Ok(error::Error::InvalidTransaction(_))) => Some(pruned_hashes[idx].clone()),
+				Err(Ok(error::Error::InvalidTransaction(_))) => Some(pruned_hashes[idx]),
 				_ => None,
 			});
 		// Fire `pruned` notifications for collected hashes and make sure to include
@@ -498,7 +496,7 @@ impl<B: ChainApi> ValidatedPool<B> {
 		hashes: impl Iterator<Item=ExtrinsicHash<B>>,
 	) -> Result<(), B::Error> {
 		let header_hash = self.api.block_id_to_hash(at)?
-			.ok_or_else(|| error::Error::InvalidBlockId(format!("{:?}", at)).into())?;
+			.ok_or_else(|| error::Error::InvalidBlockId(format!("{:?}", at)))?;
 		let mut listener = self.listener.write();
 		let mut set = HashSet::with_capacity(hashes.size_hint().0);
 		for h in hashes {
@@ -519,13 +517,13 @@ impl<B: ChainApi> ValidatedPool<B> {
 	/// See `prune_tags` if you want this.
 	pub fn clear_stale(&self, at: &BlockId<B::Block>) -> Result<(), B::Error> {
 		let block_number = self.api.block_id_to_number(at)?
-			.ok_or_else(|| error::Error::InvalidBlockId(format!("{:?}", at)).into())?
+			.ok_or_else(|| error::Error::InvalidBlockId(format!("{:?}", at)))?
 			.saturated_into::<u64>();
 		let now = Instant::now();
 		let to_remove = {
 			self.ready()
 				.filter(|tx| self.rotator.ban_if_stale(&now, block_number, &tx))
-				.map(|tx| tx.hash.clone())
+				.map(|tx| tx.hash)
 				.collect::<Vec<_>>()
 		};
 		let futures_to_remove: Vec<ExtrinsicHash<B>> = {
@@ -533,7 +531,7 @@ impl<B: ChainApi> ValidatedPool<B> {
 			let mut hashes = Vec::new();
 			for tx in p.futures() {
 				if self.rotator.ban_if_stale(&now, block_number, &tx) {
-					hashes.push(tx.hash.clone());
+					hashes.push(tx.hash);
 				}
 			}
 			hashes
diff --git a/substrate/client/transaction-pool/src/lib.rs b/substrate/client/transaction-pool/src/lib.rs
index b6f19ba376..efd5a7a143 100644
--- a/substrate/client/transaction-pool/src/lib.rs
+++ b/substrate/client/transaction-pool/src/lib.rs
@@ -167,7 +167,7 @@ impl<PoolApi, Block> BasicPool<PoolApi, Block>
 		let (revalidation_queue, background_task, notifier) =
 			revalidation::RevalidationQueue::new_test(pool_api.clone(), pool.clone());
 		(
-			BasicPool {
+			Self {
 				api: pool_api,
 				pool,
 				revalidation_queue: Arc::new(revalidation_queue),
@@ -203,7 +203,7 @@ impl<PoolApi, Block> BasicPool<PoolApi, Block>
 			spawner.spawn("txpool-background", background_task);
 		}
 
-		BasicPool {
+		Self {
 			api: pool_api,
 			pool,
 			revalidation_queue: Arc::new(revalidation_queue),