separate trie from util and make its dependencies into libs:

* bytes
* hashdb
* memorydb
* nibbleslice
* nibblevec

ethcore/src/trace/executive_tracer.rs

@@ -17,7 +17,8 @@
 //! Simple executive tracer.
 
 use bigint::prelude::U256;
-use util::{Bytes, Address};
+use util::Address;
+use bytes::Bytes;
 use vm::ActionParams;
 use trace::trace::{Call, Create, Action, Res, CreateResult, CallResult, VMTrace, VMOperation, VMExecutedOperation, MemoryDiff, StorageDiff, Suicide, Reward, RewardType};
 use trace::{Tracer, VMTracer, FlatTrace, TraceError};

ethcore/src/trace/mod.rs

@@ -39,7 +39,8 @@ pub use self::types::filter::{Filter, AddressesFilter};
 
 use bigint::prelude::U256;
 use bigint::hash::H256;
-use util::{Bytes, Address, DBTransaction};
+use util::{Address, DBTransaction};
+use bytes::Bytes;
 use self::trace::{Call, Create};
 use vm::ActionParams;
 use header::BlockNumber;

ethcore/src/trace/noop_tracer.rs

@@ -17,7 +17,8 @@
 //! Nonoperative tracer.
 
 use bigint::prelude::U256;
-use util::{Bytes, Address};
+use util::Address;
+use bytes::Bytes;
 use vm::ActionParams;
 use trace::{Tracer, VMTracer, FlatTrace, TraceError};
 use trace::trace::{Call, Create, VMTrace, RewardType};

ethcore/src/trace/types/trace.rs

@@ -17,7 +17,8 @@
 //! Tracing datatypes.
 
 use bigint::prelude::U256;
-use util::{Bytes, Address};
+use util::Address;
+use bytes::Bytes;
 use hash::keccak;
 use bloomable::Bloomable;
 use rlp::*;