Fix State cloning.

ethcore/src/state.rs

@@ -405,6 +405,25 @@ fn should_apply_create_transaction() {
 	assert_eq!(result.trace, expected_trace);
 }
 
+#[test]
+fn should_work_when_cloned() {
+	init_log();
+
+	let a = Address::zero();
+
+	let temp = RandomTempPath::new();
+	let mut state = {
+		let mut state = get_temp_state_in(temp.as_path());
+		assert_eq!(state.exists(&a), false);
+		state.inc_nonce(&a);
+		state.commit();
+		state.clone()
+	};
+
+	state.inc_nonce(&a);
+	state.commit();
+}
+
 #[test]
 fn should_trace_failed_create_transaction() {
 	init_log();

util/src/journaldb/archivedb.rs

@@ -130,7 +130,7 @@ impl HashDB for ArchiveDB {
 impl JournalDB for ArchiveDB {
 	fn spawn(&self) -> Box<JournalDB> {
 		Box::new(ArchiveDB {
-			overlay: MemoryDB::new(),
+			overlay: self.overlay.clone(),
 			backing: self.backing.clone(),
 			latest_era: self.latest_era,
 		})

util/src/journaldb/earlymergedb.rs

@@ -322,7 +322,7 @@ impl HashDB for EarlyMergeDB {
 impl JournalDB for EarlyMergeDB {
 	fn spawn(&self) -> Box<JournalDB> {
 		Box::new(EarlyMergeDB {
-			overlay: MemoryDB::new(),
+			overlay: self.overlay.clone(),
 			backing: self.backing.clone(),
 			refs: self.refs.clone(),
 			latest_era: self.latest_era.clone(),

util/src/journaldb/overlayrecentdb.rs

@@ -85,7 +85,7 @@ impl HeapSizeOf for JournalEntry {
 impl Clone for OverlayRecentDB {
 	fn clone(&self) -> OverlayRecentDB {
 		OverlayRecentDB {
-			transaction_overlay: MemoryDB::new(),
+			transaction_overlay: self.transaction_overlay.clone(),
 			backing: self.backing.clone(),
 			journal_overlay: self.journal_overlay.clone(),
 		}