diff --git a/jsontests/src/state.rs b/jsontests/src/state.rs
index e2d2f5f..760b8a1 100644
--- a/jsontests/src/state.rs
+++ b/jsontests/src/state.rs
@@ -23,15 +23,15 @@ impl Test {
 	}
 
 	pub fn unwrap_caller(&self) -> H160 {
-		let hash: H256 = self.0.transaction.secret.clone().unwrap().into();
+		let hash: H256 = self.0.transaction.secret.unwrap().into();
 		let mut secret_key = [0; 32];
-		secret_key.copy_from_slice(&hash.as_bytes()[..]);
+		secret_key.copy_from_slice(hash.as_bytes());
 		let secret = SecretKey::parse(&secret_key);
 		let public = libsecp256k1::PublicKey::from_secret_key(&secret.unwrap());
 		let mut res = [0u8; 64];
 		res.copy_from_slice(&public.serialize()[1..65]);
 
-		H160::from(H256::from_slice(Keccak256::digest(&res).as_slice()))
+		H160::from(H256::from_slice(Keccak256::digest(res).as_slice()))
 	}
 
 	pub fn unwrap_to_vicinity(&self, spec: &ForkSpec) -> Option<MemoryVicinity> {
@@ -74,11 +74,11 @@ impl Test {
 			gas_price,
 			origin: self.unwrap_caller(),
 			block_hashes: Vec::new(),
-			block_number: self.0.env.number.clone().into(),
-			block_coinbase: self.0.env.author.clone().into(),
-			block_timestamp: self.0.env.timestamp.clone().into(),
-			block_difficulty: self.0.env.difficulty.clone().into(),
-			block_gas_limit: self.0.env.gas_limit.clone().into(),
+			block_number: self.0.env.number.into(),
+			block_coinbase: self.0.env.author.into(),
+			block_timestamp: self.0.env.timestamp.into(),
+			block_difficulty: self.0.env.difficulty.into(),
+			block_gas_limit: self.0.env.gas_limit.into(),
 			chain_id: U256::one(),
 			block_base_fee_per_gas,
 		})
diff --git a/jsontests/src/utils.rs b/jsontests/src/utils.rs
index 38b52db..60bbd39 100644
--- a/jsontests/src/utils.rs
+++ b/jsontests/src/utils.rs
@@ -144,9 +144,9 @@ pub fn assert_valid_hash(h: &H256, b: &BTreeMap<H160, MemoryAccount>) {
 		.collect::<Vec<_>>();
 
 	let root = ethereum::util::sec_trie_root(tree);
-	let expect = h.clone().into();
+	let expect = h;
 
-	if root != expect {
+	if root != *expect {
 		panic!(
 			"Hash not equal; calculated: {:?}, expect: {:?}\nState: {:#x?}",
 			root, expect, b
@@ -157,7 +157,7 @@ pub fn assert_valid_hash(h: &H256, b: &BTreeMap<H160, MemoryAccount>) {
 pub fn flush() {
 	use std::io::{self, Write};
 
-	io::stdout().flush().ok().expect("Could not flush stdout");
+	io::stdout().flush().expect("Could not flush stdout");
 }
 
 pub mod transaction {
diff --git a/jsontests/tests/state.rs b/jsontests/tests/state.rs
index e38a1cb..ebefc3b 100644
--- a/jsontests/tests/state.rs
+++ b/jsontests/tests/state.rs
@@ -13,7 +13,7 @@ pub fn run(dir: &str) {
 	for entry in fs::read_dir(dest).unwrap() {
 		let entry = entry.unwrap();
 		if let Some(s) = entry.file_name().to_str() {
-			if s.starts_with(".") {
+			if s.starts_with('.') {
 				continue;
 			}
 		}
@@ -23,8 +23,8 @@ pub fn run(dir: &str) {
 		let file = File::open(path).expect("Open file failed");
 
 		let reader = BufReader::new(file);
-		let coll = serde_json::from_reader::<_, HashMap<String, statetests::Test>>(reader)
-			.expect("Parse test cases failed");
+		let coll: HashMap<String, statetests::Test> =
+			serde_json::from_reader(reader).expect("Parse test cases failed");
 
 		for (name, test) in coll {
 			statetests::test(&name, test);