Add clone method to some types

beacon_chain/types/src/beacon_state.rs

@@ -7,7 +7,7 @@ use super::shard_reassignment_record::ShardReassignmentRecord;
 use super::validator_record::ValidatorRecord;
 use super::Hash256;
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Clone)]
 pub struct BeaconState {
     // Misc
     pub slot: u64,

beacon_chain/types/src/candidate_pow_receipt_root_record.rs

@@ -1,6 +1,6 @@
 use super::Hash256;
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Clone)]
 pub struct CandidatePoWReceiptRootRecord {
     pub candidate_pow_receipt_root: Hash256,
     pub votes: u64,

beacon_chain/types/src/shard_reassignment_record.rs

@@ -1,4 +1,4 @@
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Clone)]
 pub struct ShardReassignmentRecord {
     pub validator_index: u64,
     pub shard: u64,