Add untested minimum viable block processing

beacon_chain/types/src/active_state.rs

@@ -1,8 +1,5 @@
 use super::Hash256;
-use super::{
-    AttestationRecord,
-    SpecialRecord,
-};
+use super::{AttestationRecord, SpecialRecord};
 
 #[derive(Debug, PartialEq)]
 pub struct ActiveState {
@@ -11,3 +8,10 @@ pub struct ActiveState {
     pub recent_block_hashes: Vec<Hash256>,
     pub randao_mix: Hash256,
 }
+
+impl ActiveState {
+    // TODO: implement this.
+    pub fn canonical_root(&self) -> Hash256 {
+        Hash256::zero()
+    }
+}

beacon_chain/types/src/crystallized_state.rs

@@ -1,9 +1,8 @@
-use super::validator_record::ValidatorRecord;
 use super::crosslink_record::CrosslinkRecord;
 use super::shard_and_committee::ShardAndCommittee;
+use super::validator_record::ValidatorRecord;
 use super::Hash256;
 
-
 #[derive(Debug, PartialEq)]
 pub struct CrystallizedState {
     pub validator_set_change_slot: u64,
@@ -20,3 +19,10 @@ pub struct CrystallizedState {
     pub post_fork_version: u32,
     pub fork_slot_number: u32,
 }
+
+impl CrystallizedState {
+    // TODO: implement this.
+    pub fn canonical_root(&self) -> Hash256 {
+        Hash256::zero()
+    }
+}