Fix warnings and clippy lints

eth2/state_processing/src/block_processable/verify_slashable_attestation.rs

@@ -1,5 +1,4 @@
 use super::Error;
-use log::error;
 use types::*;
 
 macro_rules! ensure {
@@ -27,17 +26,14 @@ pub fn verify_slashable_attestation(
             | slashable_attestation_1.is_surround_vote(slashable_attestation_2, spec),
         Error::BadAttesterSlashing
     );
-    error!("this a");
     ensure!(
         state.verify_slashable_attestation(&slashable_attestation_1, spec),
         Error::BadAttesterSlashing
     );
-    error!("this b");
     ensure!(
         state.verify_slashable_attestation(&slashable_attestation_2, spec),
         Error::BadAttesterSlashing
     );
-    error!("this c");
 
     let mut slashable_indices = vec![];
     for i in &slashable_attestation_1.validator_indices {
@@ -53,7 +49,7 @@ pub fn verify_slashable_attestation(
         }
     }
 
-    ensure!(slashable_indices.len() >= 1, Error::BadAttesterSlashing);
+    ensure!(!slashable_indices.is_empty(), Error::BadAttesterSlashing);
 
     for i in slashable_indices {
         state.penalize_validator(*i as usize, spec)?;

eth2/types/src/attester_slashing/builder.rs

@@ -16,8 +16,8 @@ impl AttesterSlashingBuilder {
         let shard = 0;
         let justified_epoch = Epoch::new(0);
         let epoch = Epoch::new(0);
-        let hash_1 = Hash256::from("1".as_bytes());
-        let hash_2 = Hash256::from("2".as_bytes());
+        let hash_1 = Hash256::from(&[1][..]);
+        let hash_2 = Hash256::from(&[2][..]);
 
         let mut slashable_attestation_1 = SlashableAttestation {
             validator_indices: validator_indices.to_vec(),

eth2/types/src/beacon_state.rs

@@ -419,8 +419,7 @@ impl BeaconState {
             committees_per_epoch
         );
 
-        let active_validator_indices: Vec<usize> =
-            active_validator_indices.iter().cloned().collect();
+        let active_validator_indices: Vec<usize> = active_validator_indices.to_vec();
 
         let shuffled_active_validator_indices = shuffle_list(
             active_validator_indices,

eth2/types/src/proposer_slashing/builder.rs

@@ -14,13 +14,13 @@ impl ProposerSlashingBuilder {
         let proposal_data_1 = ProposalSignedData {
             slot,
             shard,
-            block_root: Hash256::from("one".as_bytes()),
+            block_root: Hash256::from(&[1][..]),
         };
 
         let proposal_data_2 = ProposalSignedData {
             slot,
             shard,
-            block_root: Hash256::from("two".as_bytes()),
+            block_root: Hash256::from(&[2][..]),
         };
 
         let proposal_signature_1 = {

eth2/utils/bls/src/aggregate_public_key.rs

@@ -5,7 +5,7 @@ use bls_aggregates::AggregatePublicKey as RawAggregatePublicKey;
 ///
 /// This struct is a wrapper upon a base type and provides helper functions (e.g., SSZ
 /// serialization).
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Default)]
 pub struct AggregatePublicKey(RawAggregatePublicKey);
 
 impl AggregatePublicKey {