diff --git a/Cargo.lock b/Cargo.lock
index d9c963809..fd99ff8f2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -348,6 +348,7 @@ dependencies = [
  "libc 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nix 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocksdb 0.4.3 (git+https://github.com/arkpar/rust-rocksdb.git)",
  "rust-crypto 0.2.35 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/ethcore/src/basic_authority.rs b/ethcore/src/basic_authority.rs
index af0bcb207..e1dab7c17 100644
--- a/ethcore/src/basic_authority.rs
+++ b/ethcore/src/basic_authority.rs
@@ -24,7 +24,7 @@ use engine::*;
 use evm::{Schedule, Factory};
 use ethjson;
 
-/// BasicAuthority params.
+/// `BasicAuthority` params.
 #[derive(Debug, PartialEq)]
 pub struct BasicAuthorityParams {
 	/// Gas limit divisor.
@@ -45,7 +45,7 @@ impl From<ethjson::spec::BasicAuthorityParams> for BasicAuthorityParams {
 	}
 }
 
-/// Engine using BasicAuthority proof-of-work consensus algorithm, suitable for Ethereum
+/// Engine using `BasicAuthority` proof-of-work consensus algorithm, suitable for Ethereum
 /// mainnet chains in the Olympic, Frontier and Homestead eras.
 pub struct BasicAuthority {
 	params: CommonParams,
@@ -192,7 +192,7 @@ impl Header {
 	}
 }
 
-/// Create a new test chain spec with BasicAuthority consensus engine.
+/// Create a new test chain spec with `BasicAuthority` consensus engine.
 pub fn new_test_authority() -> Spec { Spec::load(include_bytes!("../res/test_authority.json")) }
 
 #[cfg(test)]
diff --git a/ethcore/src/client/client.rs b/ethcore/src/client/client.rs
index ed5460ffd..23b81b34e 100644
--- a/ethcore/src/client/client.rs
+++ b/ethcore/src/client/client.rs
@@ -42,7 +42,7 @@ use env_info::EnvInfo;
 use executive::{Executive, Executed, TransactOptions, contract_address};
 use receipt::LocalizedReceipt;
 pub use blockchain::CacheSize as BlockChainCacheSize;
-use trace::{TraceDB, ImportRequest as TraceImportRequest, LocalizedTrace, Database as TraceDatabase, Filter as TracedbFilter};
+use trace::{TraceDB, ImportRequest as TraceImportRequest, LocalizedTrace, Database as TraceDatabase};
 use trace;
 
 /// General block status
diff --git a/miner/src/miner.rs b/miner/src/miner.rs
index 66545c8e1..78ff824f6 100644
--- a/miner/src/miner.rs
+++ b/miner/src/miner.rs
@@ -166,9 +166,9 @@ impl Miner {
 				trace!(target: "miner", "prepare_sealing: block has transaction - attempting internal seal.");
 				// block with transactions - see if we can seal immediately.
 				let a = self.accounts.read().unwrap();
-				let s = chain.generate_seal(block.block(), match a.deref() {
-					&Some(ref x) => Some(x.deref() as &AccountProvider),
-					&None => None,
+				let s = chain.generate_seal(block.block(), match *a.deref() {
+					Some(ref x) => Some(x.deref() as &AccountProvider),
+					None => None,
 				});
 				if let Some(seal) = s {
 					trace!(target: "miner", "prepare_sealing: managed internal seal. importing...");
@@ -183,7 +183,7 @@ impl Miner {
 					}
 					return;
 				} else {
-					trace!(target: "miner", "prepare_sealing: unable to generate seal internally");					
+					trace!(target: "miner", "prepare_sealing: unable to generate seal internally");
 				}
 			}
 			if sealing_work.peek_last_ref().map_or(true, |pb| pb.block().fields().header.hash() != block.block().fields().header.hash()) {
diff --git a/parity/main.rs b/parity/main.rs
index 4fa18bd4d..0228527dd 100644
--- a/parity/main.rs
+++ b/parity/main.rs
@@ -208,7 +208,7 @@ fn execute_client(conf: Configuration) {
 }
 
 fn flush_stdout() {
-	::std::io::stdout().flush().ok().expect("stdout is flushable; qed");
+	::std::io::stdout().flush().expect("stdout is flushable; qed");
 }
 
 fn execute_account_cli(conf: Configuration) {