diff --git a/src/block.rs b/src/block.rs
index 3c42e4e27..6ed97f6a7 100644
--- a/src/block.rs
+++ b/src/block.rs
@@ -123,7 +123,7 @@ impl<'engine> OpenBlock<'engine> {
 		}
 	}
 
-	/// Turn this into a `ClosedBlock`. A BlockChain must be provided in order to figure ou the uncles.
+	/// Turn this into a `ClosedBlock`. A BlockChain must be provided in order to figure out the uncles.
 	pub fn close(self, _uncles: Vec<Header>) -> ClosedBlock<'engine> { unimplemented!(); }
 }
 
@@ -155,11 +155,10 @@ impl IsBlock for SealedBlock {
 
 #[test]
 fn open_block() {
-	use super::*;
 	use spec::*;
 	let engine = Spec::new_test().to_engine().unwrap();
 	let genesis_header = engine.spec().genesis_header();
 	let mut db = OverlayDB::new_temp();
 	engine.spec().ensure_db_good(&mut db);
-	let b = OpenBlock::new(engine.deref(), db, &genesis_header, vec![genesis_header.hash()]);
+	let _ = OpenBlock::new(engine.deref(), db, &genesis_header, vec![genesis_header.hash()]);
 }
\ No newline at end of file
diff --git a/src/ethereum/ethash.rs b/src/ethereum/ethash.rs
index 13b1f6a46..a238330ea 100644
--- a/src/ethereum/ethash.rs
+++ b/src/ethereum/ethash.rs
@@ -31,16 +31,10 @@ impl Engine for Ethash {
 #[test]
 fn playpen() {
 	use super::*;
-	use state::*;
 	let engine = new_morden().to_engine().unwrap();
 	let genesis_header = engine.spec().genesis_header();
 	let mut db = OverlayDB::new_temp();
 	engine.spec().ensure_db_good(&mut db);
-	assert!(SecTrieDB::new(&db, &genesis_header.state_root).contains(&address_from_hex("102e61f5d8f9bc71d0ad4a084df4e65e05ce0e1c")));
-	{
-		let s = State::from_existing(db.clone(), genesis_header.state_root.clone(), engine.account_start_nonce());
-		assert_eq!(s.balance(&address_from_hex("0000000000000000000000000000000000000001")), U256::from(1u64));
-	}
-	let b = OpenBlock::new(engine.deref(), db, &genesis_header, vec![genesis_header.hash()]);
+	let _ = OpenBlock::new(engine.deref(), db, &genesis_header, vec![genesis_header.hash()]);
 //	let c = b.close();
 }
\ No newline at end of file
diff --git a/src/ethereum/mod.rs b/src/ethereum/mod.rs
index e743c6d09..ed1950d64 100644
--- a/src/ethereum/mod.rs
+++ b/src/ethereum/mod.rs
@@ -56,7 +56,7 @@ mod tests {
 		let genesis = morden.genesis_block();
 		assert_eq!(BlockView::new(&genesis).header_view().sha3(), H256::from_str("0cd786a2425d16f152c658316c423e6ce1181e15c3295826d7c9904cba9ce303").unwrap());
 
-		morden.to_engine();
+		let _ = morden.to_engine();
 	}
 
 	#[test]
@@ -67,6 +67,6 @@ mod tests {
 		let genesis = frontier.genesis_block();
 		assert_eq!(BlockView::new(&genesis).header_view().sha3(), H256::from_str("d4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3").unwrap());
 
-		frontier.to_engine();
+		let _ = frontier.to_engine();
 	}
 }
\ No newline at end of file