diff --git a/beacon_node/beacon_chain/src/beacon_chain.rs b/beacon_node/beacon_chain/src/beacon_chain.rs
index 49e2cec83..0becbf2c9 100644
--- a/beacon_node/beacon_chain/src/beacon_chain.rs
+++ b/beacon_node/beacon_chain/src/beacon_chain.rs
@@ -3,6 +3,7 @@ use crate::errors::{BeaconChainError as Error, BlockProductionError};
 use crate::fork_choice::{Error as ForkChoiceError, ForkChoice};
 use crate::metrics::Metrics;
 use crate::persisted_beacon_chain::{PersistedBeaconChain, BEACON_CHAIN_DB_KEY};
+use crate::BeaconChainError;
 use lmd_ghost::LmdGhost;
 use log::trace;
 use operation_pool::DepositInsertStatus;
@@ -11,19 +12,18 @@ use parking_lot::{RwLock, RwLockReadGuard};
 use slog::{error, info, warn, Logger};
 use slot_clock::SlotClock;
 use state_processing::per_block_processing::errors::{
-    AttesterSlashingValidationError, DepositValidationError,
-    ExitValidationError, ProposerSlashingValidationError, TransferValidationError,
+    AttesterSlashingValidationError, DepositValidationError, ExitValidationError,
+    ProposerSlashingValidationError, TransferValidationError,
 };
 use state_processing::{
-    per_block_processing, per_block_processing_without_verifying_block_signature,
-    per_slot_processing, BlockProcessingError, common
+    common, per_block_processing, per_block_processing_without_verifying_block_signature,
+    per_slot_processing, BlockProcessingError,
 };
 use std::sync::Arc;
 use store::iter::{BestBlockRootsIterator, BlockIterator, BlockRootsIterator, StateRootsIterator};
 use store::{Error as DBError, Store};
 use tree_hash::TreeHash;
 use types::*;
-use crate::BeaconChainError;
 
 // Text included in blocks.
 // Must be 32-bytes or panic.
@@ -511,17 +511,21 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
     ///
     /// If valid, the attestation is added to the `op_pool` and aggregated with another attestation
     /// if possible.
-    pub fn process_attestation(
-        &self,
-        attestation: Attestation<T::EthSpec>,
-    ) -> Result<(), Error> {
+    pub fn process_attestation(&self, attestation: Attestation<T::EthSpec>) -> Result<(), Error> {
         self.metrics.attestation_processing_requests.inc();
         let timer = self.metrics.attestation_processing_times.start_timer();
 
         if let Some(state) = self.get_attestation_state(&attestation) {
-            if self.fork_choice.should_process_attestation(&state, &attestation)? {
+            if self
+                .fork_choice
+                .should_process_attestation(&state, &attestation)?
+            {
                 let indexed_attestation = common::get_indexed_attestation(&state, &attestation)?;
-                per_block_processing::is_valid_indexed_attestation(&state, &indexed_attestation, &self.spec)?;
+                per_block_processing::is_valid_indexed_attestation(
+                    &state,
+                    &indexed_attestation,
+                    &self.spec,
+                )?;
                 self.fork_choice.process_attestation(&state, &attestation)?;
             }
         }
@@ -540,12 +544,20 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
     }
 
     /// Retrieves the `BeaconState` used to create the attestation.
-    fn get_attestation_state(&self, attestation: &Attestation<T::EthSpec>) -> Option<BeaconState<T::EthSpec>> {
+    fn get_attestation_state(
+        &self,
+        attestation: &Attestation<T::EthSpec>,
+    ) -> Option<BeaconState<T::EthSpec>> {
         // Current state is used if the attestation targets a historic block and a slot within an
         // equal or adjacent epoch.
         let slots_per_epoch = T::EthSpec::slots_per_epoch();
-        let min_slot = (self.state.read().slot.epoch(slots_per_epoch) - 1).start_slot(slots_per_epoch);
-        let blocks = BestBlockRootsIterator::owned(self.store.clone(), self.state.read().clone(), self.state.read().slot.clone());
+        let min_slot =
+            (self.state.read().slot.epoch(slots_per_epoch) - 1).start_slot(slots_per_epoch);
+        let blocks = BestBlockRootsIterator::owned(
+            self.store.clone(),
+            self.state.read().clone(),
+            self.state.read().slot.clone(),
+        );
         for (root, slot) in blocks {
             if root == attestation.data.target.root {
                 return Some(self.state.read().clone());
@@ -554,15 +566,18 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             if slot == min_slot {
                 break;
             }
-        };
+        }
 
         // A different state is retrieved from the database.
-        match self.store.get::<BeaconBlock<T::EthSpec>>(&attestation.data.target.root) {
+        match self
+            .store
+            .get::<BeaconBlock<T::EthSpec>>(&attestation.data.target.root)
+        {
             Ok(Some(block)) => match self.store.get::<BeaconState<T::EthSpec>>(&block.state_root) {
                 Ok(state) => state,
-                _ => None
+                _ => None,
             },
-            _ => None
+            _ => None,
         }
     }
 
@@ -1031,4 +1046,3 @@ impl From<BeaconStateError> for Error {
         Error::BeaconStateError(e)
     }
 }
-
diff --git a/beacon_node/beacon_chain/src/errors.rs b/beacon_node/beacon_chain/src/errors.rs
index 4e2170ca8..266c598ac 100644
--- a/beacon_node/beacon_chain/src/errors.rs
+++ b/beacon_node/beacon_chain/src/errors.rs
@@ -1,9 +1,11 @@
 use crate::fork_choice::Error as ForkChoiceError;
 use crate::metrics::Error as MetricsError;
+use state_processing::per_block_processing::errors::{
+    AttestationValidationError, IndexedAttestationValidationError,
+};
 use state_processing::BlockProcessingError;
 use state_processing::SlotProcessingError;
 use types::*;
-use state_processing::per_block_processing::errors::{AttestationValidationError, IndexedAttestationValidationError};
 
 macro_rules! easy_from_to {
     ($from: ident, $to: ident) => {
@@ -33,7 +35,7 @@ pub enum BeaconChainError {
     SlotProcessingError(SlotProcessingError),
     MetricsError(String),
     AttestationValidationError(AttestationValidationError),
-    IndexedAttestationValidationError(IndexedAttestationValidationError)
+    IndexedAttestationValidationError(IndexedAttestationValidationError),
 }
 
 easy_from_to!(SlotProcessingError, BeaconChainError);
diff --git a/beacon_node/beacon_chain/src/fork_choice.rs b/beacon_node/beacon_chain/src/fork_choice.rs
index 3900575ae..d16a8f9a8 100644
--- a/beacon_node/beacon_chain/src/fork_choice.rs
+++ b/beacon_node/beacon_chain/src/fork_choice.rs
@@ -3,7 +3,9 @@ use lmd_ghost::LmdGhost;
 use state_processing::common::get_attesting_indices;
 use std::sync::Arc;
 use store::{Error as StoreError, Store};
-use types::{Attestation, BeaconBlock, BeaconState, BeaconStateError, Epoch, EthSpec, Hash256, Slot};
+use types::{
+    Attestation, BeaconBlock, BeaconState, BeaconStateError, Epoch, EthSpec, Hash256, Slot,
+};
 
 type Result<T> = std::result::Result<T, Error>;
 
@@ -171,7 +173,11 @@ impl<T: BeaconChainTypes> ForkChoice<T> {
     }
 
     /// Determines whether or not the given attestation contains a latest message.
-    pub fn should_process_attestation(&self, state: &BeaconState<T::EthSpec>, attestation: &Attestation<T::EthSpec>) -> Result<bool> {
+    pub fn should_process_attestation(
+        &self,
+        state: &BeaconState<T::EthSpec>,
+        attestation: &Attestation<T::EthSpec>,
+    ) -> Result<bool> {
         let validator_indices =
             get_attesting_indices(state, &attestation.data, &attestation.aggregation_bits)?;
 
@@ -179,12 +185,11 @@ impl<T: BeaconChainTypes> ForkChoice<T> {
 
         Ok(validator_indices
             .iter()
-            .find(|&&v| {
-                match self.backend.latest_message(v) {
-                    Some((_, slot)) => block_slot > slot,
-                    None => true
-                }
-            }).is_some())
+            .find(|&&v| match self.backend.latest_message(v) {
+                Some((_, slot)) => block_slot > slot,
+                None => true,
+            })
+            .is_some())
     }
 
     // Returns the latest message for a given validator
@@ -224,4 +229,3 @@ impl From<String> for Error {
         Error::BackendError(e)
     }
 }
-
diff --git a/beacon_node/beacon_chain/src/test_utils.rs b/beacon_node/beacon_chain/src/test_utils.rs
index 8f0d4c8ee..ab1a31690 100644
--- a/beacon_node/beacon_chain/src/test_utils.rs
+++ b/beacon_node/beacon_chain/src/test_utils.rs
@@ -178,12 +178,7 @@ where
             if let BlockProcessingOutcome::Processed { block_root } = outcome {
                 head_block_root = Some(block_root);
 
-                self.add_free_attestations(
-                    &attestation_strategy,
-                    &new_state,
-                    block_root,
-                    slot,
-                );
+                self.add_free_attestations(&attestation_strategy, &new_state, block_root, slot);
             } else {
                 panic!("block should be successfully processed: {:?}", outcome);
             }
diff --git a/beacon_node/beacon_chain/tests/tests.rs b/beacon_node/beacon_chain/tests/tests.rs
index cc1a84973..5b8a09faf 100644
--- a/beacon_node/beacon_chain/tests/tests.rs
+++ b/beacon_node/beacon_chain/tests/tests.rs
@@ -8,7 +8,7 @@ use lmd_ghost::ThreadSafeReducedTree;
 use rand::Rng;
 use store::{MemoryStore, Store};
 use types::test_utils::{SeedableRng, TestRandom, XorShiftRng};
-use types::{Deposit, EthSpec, Hash256, MinimalEthSpec, Slot, RelativeEpoch};
+use types::{Deposit, EthSpec, Hash256, MinimalEthSpec, RelativeEpoch, Slot};
 
 // Should ideally be divisible by 3.
 pub const VALIDATOR_COUNT: usize = 24;
@@ -270,20 +270,23 @@ fn free_attestations_added_to_fork_choice_some_none() {
     let validators: Vec<usize> = (0..VALIDATOR_COUNT).collect();
     let slots: Vec<Slot> = validators
         .iter()
-        .map(|&v|
-            state.get_attestation_duties(v, RelativeEpoch::Current)
+        .map(|&v| {
+            state
+                .get_attestation_duties(v, RelativeEpoch::Current)
                 .expect("should get attester duties")
                 .unwrap()
                 .slot
-        ).collect();
+        })
+        .collect();
     let validator_slots: Vec<(&usize, Slot)> = validators.iter().zip(slots).collect();
 
     for (validator, slot) in validator_slots.clone() {
         let latest_message = fork_choice.latest_message(*validator);
 
-        if slot <= num_blocks_produced && slot != 0{
+        if slot <= num_blocks_produced && slot != 0 {
             assert_eq!(
-                latest_message.unwrap().1, slot,
+                latest_message.unwrap().1,
+                slot,
                 "Latest message slot should be equal to attester duty."
             )
         } else {
@@ -313,30 +316,35 @@ fn free_attestations_added_to_fork_choice_all_updated() {
     let validators: Vec<usize> = (0..VALIDATOR_COUNT).collect();
     let slots: Vec<Slot> = validators
         .iter()
-        .map(|&v|
-            state.get_attestation_duties(v, RelativeEpoch::Current)
+        .map(|&v| {
+            state
+                .get_attestation_duties(v, RelativeEpoch::Current)
                 .expect("should get attester duties")
                 .unwrap()
                 .slot
-        ).collect();
+        })
+        .collect();
     let validator_slots: Vec<(&usize, Slot)> = validators.iter().zip(slots).collect();
 
     for (validator, slot) in validator_slots {
         let latest_message = fork_choice.latest_message(*validator);
 
         assert_eq!(
-            latest_message.unwrap().1, slot,
+            latest_message.unwrap().1,
+            slot,
             "Latest message slot should be equal to attester duty."
         );
 
         if slot != num_blocks_produced {
-            let block_root = state.get_block_root(slot)
+            let block_root = state
+                .get_block_root(slot)
                 .expect("Should get block root at slot");
 
             assert_eq!(
-                latest_message.unwrap().0, *block_root,
+                latest_message.unwrap().0,
+                *block_root,
                 "Latest message block root should be equal to block at slot."
             );
         }
     }
-}
\ No newline at end of file
+}
diff --git a/beacon_node/rpc/src/attestation.rs b/beacon_node/rpc/src/attestation.rs
index c7b3a5711..00a643151 100644
--- a/beacon_node/rpc/src/attestation.rs
+++ b/beacon_node/rpc/src/attestation.rs
@@ -1,4 +1,4 @@
-use beacon_chain::{BeaconChain, BeaconChainTypes, BeaconChainError};
+use beacon_chain::{BeaconChain, BeaconChainError, BeaconChainTypes};
 use eth2_libp2p::PubsubMessage;
 use eth2_libp2p::TopicBuilder;
 use eth2_libp2p::BEACON_ATTESTATION_TOPIC;
@@ -179,7 +179,11 @@ impl<T: BeaconChainTypes> AttestationService for AttestationServiceInstance<T> {
                     "error" => format!("{:?}", e),
                 );
                 resp.set_success(false);
-                resp.set_msg(format!("InvalidIndexedAttestation: {:?}", e).as_bytes().to_vec());
+                resp.set_msg(
+                    format!("InvalidIndexedAttestation: {:?}", e)
+                        .as_bytes()
+                        .to_vec(),
+                );
             }
             Err(e) => {
                 // Some other error
@@ -190,7 +194,11 @@ impl<T: BeaconChainTypes> AttestationService for AttestationServiceInstance<T> {
                     "error" => format!("{:?}", e),
                 );
                 resp.set_success(false);
-                resp.set_msg(format!("There was a beacon chain error: {:?}", e).as_bytes().to_vec());
+                resp.set_msg(
+                    format!("There was a beacon chain error: {:?}", e)
+                        .as_bytes()
+                        .to_vec(),
+                );
             }
         };
 
diff --git a/eth2/lmd_ghost/src/reduced_tree.rs b/eth2/lmd_ghost/src/reduced_tree.rs
index 0ef78c37e..5d7074804 100644
--- a/eth2/lmd_ghost/src/reduced_tree.rs
+++ b/eth2/lmd_ghost/src/reduced_tree.rs
@@ -111,9 +111,7 @@ where
     }
 
     fn latest_message(&self, validator_index: usize) -> Option<(Hash256, Slot)> {
-        self.core
-            .write()
-            .latest_message(validator_index)
+        self.core.write().latest_message(validator_index)
     }
 }
 
@@ -263,7 +261,7 @@ where
     pub fn latest_message(&mut self, validator_index: usize) -> Option<(Hash256, Slot)> {
         match self.latest_votes.get(validator_index) {
             Some(v) => Some((v.hash.clone(), v.slot.clone())),
-            None => None
+            None => None,
         }
     }