Don't reexport bigint from util

ethcore/vm/Cargo.toml

@@ -6,6 +6,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 [dependencies]
 byteorder = "1.0"
 ethcore-util = { path = "../../util" }
+ethcore-bigint = { path = "../../util/bigint" }
 log = "0.3"
 common-types = { path = "../types" }
 evmjit = { path = "../../evmjit", optional = true }

ethcore/vm/src/action_params.rs

@@ -15,8 +15,9 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 //! Evm input params.
-use util::{Address, Bytes, U256};
-use util::hash::{H256};
+use bigint::prelude::U256;
+use bigint::hash::{H256};
+use util::{Address, Bytes};
 use hash::{keccak, KECCAK_EMPTY};
 use ethjson;
 

ethcore/vm/src/env_info.rs

@@ -19,7 +19,9 @@
 use std::cmp;
 use std::sync::Arc;
 use hash::keccak;
-use util::{U256, Address, H256};
+use bigint::hash::H256;
+use bigint::prelude::U256;
+use util::Address;
 use types::BlockNumber;
 use ethjson;
 
@@ -79,7 +81,8 @@ impl From<ethjson::vm::Env> for EnvInfo {
 mod tests {
 	use std::str::FromStr;
 	use super::*;
-	use util::{U256, Address};
+	use bigint::prelude::U256;
+	use util::Address;
 	use ethjson;
 
 	#[test]

ethcore/vm/src/ext.rs

@@ -17,6 +17,8 @@
 //! Interface for Evm externalities.
 
 use std::sync::Arc;
+use bigint::prelude::U256;
+use bigint::hash::H256;
 use util::*;
 use call_type::CallType;
 use env_info::EnvInfo;

ethcore/vm/src/lib.rs

@@ -17,6 +17,7 @@
 //! Virtual machines support library
 
 extern crate ethcore_util as util;
+extern crate ethcore_bigint as bigint;
 extern crate common_types as types;
 extern crate ethjson;
 extern crate rlp;

ethcore/vm/src/return_data.rs

@@ -14,7 +14,7 @@
 
 //! Return data structures
 
-use util::U256;
+use bigint::prelude::U256;
 
 /// Return data buffer. Holds memory from a previous call and a slice into that memory.
 #[derive(Debug)]
@@ -65,4 +65,4 @@ pub enum GasLeft {
 		/// Apply or revert state changes on revert.
 		apply_state: bool
 	},
-}
+}

ethcore/vm/src/tests.rs

@@ -17,7 +17,9 @@
 use std::sync::Arc;
 use std::collections::{HashMap, HashSet};
 
-use util::{H256, U256, Address, Bytes};
+use bigint::prelude::U256;
+use bigint::hash::H256;
+use util::{Address, Bytes};
 use {
 	CallType, Schedule, EnvInfo,
 	ReturnData, Ext, ContractCreateResult, MessageCallResult,