fixes for nightly clippy (#1618)

bridges/bin/millau/node/src/chain_spec.rs

@@ -56,7 +56,7 @@ pub enum Alternative {
 
 /// Helper function to generate a crypto pair from seed
 pub fn get_from_seed<TPublic: Public>(seed: &str) -> <TPublic::Pair as Pair>::Public {
-	TPublic::Pair::from_string(&format!("//{}", seed), None)
+	TPublic::Pair::from_string(&format!("//{seed}"), None)
 		.expect("static values are valid; qed")
 		.public()
 }
@@ -150,7 +150,7 @@ fn endowed_accounts() -> Vec<AccountId> {
 	let all_authorities = ALL_AUTHORITIES_ACCOUNTS.iter().flat_map(|x| {
 		[
 			get_account_id_from_seed::<sr25519::Public>(x),
-			get_account_id_from_seed::<sr25519::Public>(&format!("{}//stash", x)),
+			get_account_id_from_seed::<sr25519::Public>(&format!("{x}//stash")),
 		]
 	});
 	vec![

bridges/bin/millau/node/src/command.rs

@@ -62,7 +62,7 @@ impl SubstrateCli for Cli {
 			match id {
 				"" | "dev" => crate::chain_spec::Alternative::Development,
 				"local" => crate::chain_spec::Alternative::LocalTestnet,
-				_ => return Err(format!("Unsupported chain specification: {}", id)),
+				_ => return Err(format!("Unsupported chain specification: {id}")),
 			}
 			.load(),
 		))

bridges/bin/millau/node/src/service.rs

@@ -293,7 +293,7 @@ pub fn new_full(mut config: Configuration) -> Result<TaskManager, ServiceError>
 
 		Box::new(move |_, subscription_executor: sc_rpc::SubscriptionTaskExecutor| {
 			let mut io = RpcModule::new(());
-			let map_err = |e| sc_service::Error::Other(format!("{}", e));
+			let map_err = |e| sc_service::Error::Other(format!("{e}"));
 			io.merge(System::new(client.clone(), pool.clone(), DenyUnsafe::No).into_rpc())
 				.map_err(map_err)?;
 			io.merge(TransactionPayment::new(client.clone()).into_rpc()).map_err(map_err)?;
@@ -314,7 +314,7 @@ pub fn new_full(mut config: Configuration) -> Result<TaskManager, ServiceError>
 					beefy_rpc_links.from_voter_best_beefy_stream.clone(),
 					subscription_executor,
 				)
-				.map_err(|e| sc_service::Error::Other(format!("{}", e)))?
+				.map_err(|e| sc_service::Error::Other(format!("{e}")))?
 				.into_rpc(),
 			)
 			.map_err(map_err)?;