Fix imports for beta compiler

consensus/state_processing/src/per_block_processing/errors.rs

@@ -1,5 +1,5 @@
 use super::signature_sets::Error as SignatureSetError;
-use crate::{ContextError, EpochCacheError};
+use crate::ContextError;
 use merkle_proof::MerkleTreeError;
 use safe_arith::ArithError;
 use ssz::DecodeError;

consensus/types/src/beacon_state.rs

@@ -1,4 +1,5 @@
 use self::committee_cache::get_active_validator_indices;
+use crate::historical_summary::HistoricalSummary;
 use crate::test_utils::TestRandom;
 use crate::*;
 use compare_fields::CompareFields;
@@ -11,8 +12,6 @@ use safe_arith::{ArithError, SafeArith};
 use serde::{Deserialize, Serialize};
 use ssz::{ssz_encode, Decode, DecodeError, Encode};
 use ssz_derive::{Decode, Encode};
-use ssz_types::{typenum::Unsigned, BitVector};
-use std::convert::TryInto;
 use std::hash::Hash;
 use std::{fmt, mem, sync::Arc};
 use superstruct::superstruct;
@@ -29,8 +28,6 @@ pub use crate::beacon_state::balance::Balance;
 pub use crate::beacon_state::exit_cache::ExitCache;
 pub use crate::beacon_state::progressive_balances_cache::*;
 pub use crate::beacon_state::slashings_cache::SlashingsCache;
-use crate::epoch_cache::EpochCache;
-use crate::historical_summary::HistoricalSummary;
 pub use clone_config::CloneConfig;
 pub use eth_spec::*;
 pub use iter::BlockRootsIter;