removed util::common

ethcore/src/engines/validator_set/contract.rs

@@ -126,6 +126,7 @@ impl ValidatorSet for ValidatorContract {
 
 #[cfg(test)]
 mod tests {
+	use std::sync::Arc;
 	use rustc_hex::FromHex;
 	use util::*;
 	use rlp::encode;

ethcore/src/engines/validator_set/multi.rs

@@ -142,6 +142,7 @@ impl ValidatorSet for Multi {
 
 #[cfg(test)]
 mod tests {
+	use std::sync::Arc;
 	use std::collections::BTreeMap;
 	use account_provider::AccountProvider;
 	use client::{BlockChainClient, EngineClient};

ethcore/src/engines/validator_set/safe_contract.rs

@@ -16,7 +16,7 @@
 
 /// Validator set maintained in a contract, updated using `getValidators` method.
 
-use std::sync::Weak;
+use std::sync::{Weak, Arc};
 use futures::Future;
 use native_contracts::ValidatorSet as Provider;
 
@@ -422,6 +422,7 @@ impl ValidatorSet for ValidatorSafeContract {
 
 #[cfg(test)]
 mod tests {
+	use std::sync::Arc;
 	use rustc_hex::FromHex;
 	use util::*;
 	use types::ids::BlockId;

ethcore/src/engines/validator_set/test.rs

@@ -17,8 +17,9 @@
 /// Used for Engine testing.
 
 use std::str::FromStr;
+use std::sync::Arc;
 use std::sync::atomic::{AtomicUsize, Ordering as AtomicOrdering};
-use util::{Arc, Bytes, H256, Address, HeapSizeOf};
+use util::{Bytes, H256, Address, HeapSizeOf};
 
 use engines::{Call, Engine};
 use header::{Header, BlockNumber};