Update to Rust 1.59 and 2021 edition (#3038)

## Proposed Changes

Lots of lint updates related to `flat_map`, `unwrap_or_else` and string patterns. I did a little more creative refactoring in the op pool, but otherwise followed Clippy's suggestions.

## Additional Info

We need this PR to unblock CI.

account_manager/Cargo.toml

@@ -2,7 +2,7 @@
 name = "account_manager"
 version = "0.3.5"
 authors = ["Paul Hauner <paul@paulhauner.com>", "Luke Anderson <luke@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 bls = { path = "../crypto/bls" }

beacon_node/Cargo.toml

@@ -2,7 +2,7 @@
 name = "beacon_node"
 version = "2.1.3"
 authors = ["Paul Hauner <paul@paulhauner.com>", "Age Manning <Age@AgeManning.com"]
-edition = "2018"
+edition = "2021"
 
 [lib]
 name = "beacon_node"

beacon_node/beacon_chain/Cargo.toml

@@ -2,7 +2,7 @@
 name = "beacon_chain"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>", "Age Manning <Age@AgeManning.com>"]
-edition = "2018"
+edition = "2021"
 autotests = false # using a single test binary compiles faster
 
 [features]

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -2289,7 +2289,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                 .position(|(_root, block)| {
                     block.slot().epoch(T::EthSpec::slots_per_epoch()) > start_epoch
                 })
-                .unwrap_or_else(|| filtered_chain_segment.len());
+                .unwrap_or(filtered_chain_segment.len());
 
             // Split off the first section blocks that are all either within the current epoch of
             // the first block. These blocks can all be signature-verified with the same

beacon_node/beacon_chain/src/naive_aggregation_pool.rs

@@ -421,10 +421,7 @@ impl<T: AggregateMap> NaiveAggregationPool<T> {
 
     /// Iterate all items in all slots of `self`.
     pub fn iter(&self) -> impl Iterator<Item = &T::Value> {
-        self.maps
-            .iter()
-            .map(|(_slot, map)| map.get_map().iter().map(|(_key, value)| value))
-            .flatten()
+        self.maps.values().flat_map(|map| map.get_map().values())
     }
 
     /// Removes any items with a slot lower than `current_slot` and bars any future

beacon_node/beacon_chain/src/sync_committee_verification.rs

@@ -635,7 +635,7 @@ pub fn verify_sync_committee_message<T: BeaconChainTypes>(
     let pubkey = pubkey_cache
         .get_pubkey_from_pubkey_bytes(pubkey_bytes)
         .map(Cow::Borrowed)
-        .ok_or_else(|| Error::UnknownValidatorPubkey(*pubkey_bytes))?;
+        .ok_or(Error::UnknownValidatorPubkey(*pubkey_bytes))?;
 
     let next_slot_epoch = (sync_message.get_slot() + 1).epoch(T::EthSpec::slots_per_epoch());
     let fork = chain.spec.fork_at_epoch(next_slot_epoch);

beacon_node/beacon_chain/src/validator_monitor.rs

@@ -198,14 +198,11 @@ impl MonitoredValidator {
     /// as the value recorded by the validator monitor ignores skip slots.
     fn min_inclusion_distance(&self, epoch: &Epoch) -> Option<u64> {
         let summaries = self.summaries.read();
-        summaries
-            .get(epoch)
-            .map(|summary| {
-                summary
-                    .attestation_min_block_inclusion_distance
-                    .map(Into::into)
-            })
-            .flatten()
+        summaries.get(epoch).and_then(|summary| {
+            summary
+                .attestation_min_block_inclusion_distance
+                .map(Into::into)
+        })
     }
 
     /// Maps `func` across the `self.summaries`.

beacon_node/beacon_chain/src/validator_pubkey_cache.rs

@@ -175,9 +175,7 @@ impl<T: BeaconChainTypes> ValidatorPubkeyCache<T> {
 
     /// Get the `PublicKey` for a validator with `PublicKeyBytes`.
     pub fn get_pubkey_from_pubkey_bytes(&self, pubkey: &PublicKeyBytes) -> Option<&PublicKey> {
-        self.get_index(pubkey)
-            .map(|index| self.get(index))
-            .flatten()
+        self.get_index(pubkey).and_then(|index| self.get(index))
     }
 
     /// Get the public key (in bytes form) for a validator with index `i`.

beacon_node/beacon_chain/tests/sync_committee_verification.rs

@@ -179,7 +179,7 @@ fn aggregated_gossip_verification() {
         get_valid_sync_contribution(&harness, RelativeSyncCommittee::Current);
 
     macro_rules! assert_invalid {
-            ($desc: tt, $attn_getter: expr, $($error: pat) |+ $( if $guard: expr )?) => {
+            ($desc: tt, $attn_getter: expr, $($error: pat_param) |+ $( if $guard: expr )?) => {
                 assert!(
                     matches!(
                         harness
@@ -505,7 +505,7 @@ fn unaggregated_gossip_verification() {
         get_valid_sync_committee_message(&harness, current_slot, RelativeSyncCommittee::Current);
 
     macro_rules! assert_invalid {
-            ($desc: tt, $attn_getter: expr, $subnet_getter: expr, $($error: pat) |+ $( if $guard: expr )?) => {
+            ($desc: tt, $attn_getter: expr, $subnet_getter: expr, $($error: pat_param) |+ $( if $guard: expr )?) => {
                 assert!(
                     matches!(
                         harness

beacon_node/client/Cargo.toml

@@ -2,7 +2,7 @@
 name = "client"
 version = "0.2.0"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dev-dependencies]
 toml = "0.5.6"

beacon_node/eth1/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth1"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [dev-dependencies]
 eth1_test_rig = { path = "../../testing/eth1_test_rig" }

beacon_node/eth1/src/http.rs

@@ -449,7 +449,7 @@ fn response_result_or_error(response: &str) -> Result<Value, RpcError> {
     let json = serde_json::from_str::<Value>(response)
         .map_err(|e| RpcError::InvalidJson(e.to_string()))?;
 
-    if let Some(error) = json.get("error").map(|e| e.get("message")).flatten() {
+    if let Some(error) = json.get("error").and_then(|e| e.get("message")) {
         let error = error.to_string();
         if error.contains(EIP155_ERROR_STR) {
             Err(RpcError::Eip155Error)

beacon_node/execution_layer/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "execution_layer"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

beacon_node/genesis/Cargo.toml

@@ -2,7 +2,7 @@
 name = "genesis"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [dev-dependencies]
 eth1_test_rig = { path = "../../testing/eth1_test_rig" }

beacon_node/http_api/Cargo.toml

@@ -2,7 +2,7 @@
 name = "http_api"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 autotests = false # using a single test binary compiles faster
 
 [dependencies]

beacon_node/http_metrics/Cargo.toml

@@ -2,7 +2,7 @@
 name = "http_metrics"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

beacon_node/lighthouse_network/Cargo.toml

@@ -2,7 +2,7 @@
 name = "lighthouse_network"
 version = "0.2.0"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 discv5 = { version = "0.1.0-beta.13", features = ["libp2p"] }

beacon_node/lighthouse_network/src/behaviour/mod.rs

@@ -458,7 +458,7 @@ impl<TSpec: EthSpec> Behaviour<TSpec> {
                         GossipKind::Attestation(subnet_id) => {
                             if let Some(v) = metrics::get_int_gauge(
                                 &metrics::FAILED_ATTESTATION_PUBLISHES_PER_SUBNET,
-                                &[&subnet_id.to_string()],
+                                &[subnet_id.as_ref()],
                             ) {
                                 v.inc()
                             };

beacon_node/network/Cargo.toml

@@ -2,7 +2,7 @@
 name = "network"
 version = "0.2.0"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dev-dependencies]
 sloggers = { version = "2.1.1", features = ["json"] }

beacon_node/operation_pool/Cargo.toml

@@ -2,7 +2,7 @@
 name = "operation_pool"
 version = "0.2.0"
 authors = ["Michael Sproul <michael@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 derivative = "2.1.1"

beacon_node/operation_pool/src/lib.rs

@@ -560,9 +560,8 @@ impl<T: EthSpec> OperationPool<T> {
     pub fn get_all_attestations(&self) -> Vec<Attestation<T>> {
         self.attestations
             .read()
-            .iter()
-            .map(|(_, attns)| attns.iter().cloned())
-            .flatten()
+            .values()
+            .flat_map(|attns| attns.iter().cloned())
             .collect()
     }
 
@@ -575,10 +574,10 @@ impl<T: EthSpec> OperationPool<T> {
     {
         self.attestations
             .read()
-            .iter()
-            .map(|(_, attns)| attns.iter().cloned())
-            .flatten()
-            .filter(filter)
+            .values()
+            .flat_map(|attns| attns.iter())
+            .filter(|attn| filter(*attn))
+            .cloned()
             .collect()
     }
 

beacon_node/operation_pool/src/persistence.rs

@@ -97,20 +97,19 @@ impl<T: EthSpec> PersistedOperationPool<T> {
     /// Reconstruct an `OperationPool`. Sets `sync_contributions` to its `Default` if `self` matches
     /// `PersistedOperationPool::Base`.
     pub fn into_operation_pool(self) -> Result<OperationPool<T>, OpPoolError> {
-        let attestations = RwLock::new(self.attestations().to_vec().into_iter().collect());
-        let attester_slashings =
-            RwLock::new(self.attester_slashings().to_vec().into_iter().collect());
+        let attestations = RwLock::new(self.attestations().iter().cloned().collect());
+        let attester_slashings = RwLock::new(self.attester_slashings().iter().cloned().collect());
         let proposer_slashings = RwLock::new(
             self.proposer_slashings()
-                .to_vec()
-                .into_iter()
+                .iter()
+                .cloned()
                 .map(|slashing| (slashing.signed_header_1.message.proposer_index, slashing))
                 .collect(),
         );
         let voluntary_exits = RwLock::new(
             self.voluntary_exits()
-                .to_vec()
-                .into_iter()
+                .iter()
+                .cloned()
                 .map(|exit| (exit.message.validator_index, exit))
                 .collect(),
         );
@@ -125,7 +124,7 @@ impl<T: EthSpec> PersistedOperationPool<T> {
             },
             PersistedOperationPool::Altair(_) => {
                 let sync_contributions =
-                    RwLock::new(self.sync_contributions()?.to_vec().into_iter().collect());
+                    RwLock::new(self.sync_contributions()?.iter().cloned().collect());
 
                 OperationPool {
                     attestations,

beacon_node/src/config.rs

@@ -705,13 +705,15 @@ pub fn set_network_config(
                 // Appending enr-port to the dns hostname to appease `to_socket_addrs()` parsing.
                 // Since enr-update is disabled with a dns address, not setting the enr-udp-port
                 // will make the node undiscoverable.
-                if let Some(enr_udp_port) = config.enr_udp_port.or_else(|| {
-                    if use_listening_port_as_enr_port_by_default {
-                        Some(config.discovery_port)
-                    } else {
-                        None
-                    }
-                }) {
+                if let Some(enr_udp_port) =
+                    config
+                        .enr_udp_port
+                        .or(if use_listening_port_as_enr_port_by_default {
+                            Some(config.discovery_port)
+                        } else {
+                            None
+                        })
+                {
                     addr.push_str(&format!(":{}", enr_udp_port));
                 } else {
                     return Err(

beacon_node/store/Cargo.toml

@@ -2,7 +2,7 @@
 name = "store"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [dev-dependencies]
 tempfile = "3.1.0"

beacon_node/store/src/hot_cold_store.rs

@@ -762,7 +762,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         let partial_state_bytes = self
             .cold_db
             .get_bytes(DBColumn::BeaconState.into(), state_root.as_bytes())?
-            .ok_or_else(|| HotColdDBError::MissingRestorePoint(*state_root))?;
+            .ok_or(HotColdDBError::MissingRestorePoint(*state_root))?;
         let mut partial_state: PartialBeaconState<E> =
             PartialBeaconState::from_ssz_bytes(&partial_state_bytes, &self.spec)?;
 

beacon_node/timer/Cargo.toml

@@ -2,7 +2,7 @@
 name = "timer"
 version = "0.2.0"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 beacon_chain =  { path = "../beacon_chain" }

boot_node/Cargo.toml

@@ -2,7 +2,7 @@
 name = "boot_node"
 version = "2.1.3"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 beacon_node = { path = "../beacon_node" }

common/account_utils/Cargo.toml

@@ -2,7 +2,7 @@
 name = "account_utils"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/clap_utils/Cargo.toml

@@ -2,7 +2,7 @@
 name = "clap_utils"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/clap_utils/src/lib.rs

@@ -31,7 +31,7 @@ pub fn get_eth2_network_config(cli_args: &ArgMatches) -> Result<Eth2NetworkConfi
 
     if let Some(string) = parse_optional::<String>(cli_args, "terminal-total-difficulty-override")?
     {
-        let stripped = string.replace(",", "");
+        let stripped = string.replace(',', "");
         let terminal_total_difficulty = Uint256::from_dec_str(&stripped).map_err(|e| {
             format!(
                 "Could not parse --terminal-total-difficulty-override as decimal value: {:?}",

common/compare_fields/Cargo.toml

@@ -2,7 +2,7 @@
 name = "compare_fields"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [dev-dependencies]
 compare_fields_derive = { path = "../compare_fields_derive" }

common/compare_fields_derive/Cargo.toml

@@ -2,7 +2,7 @@
 name = "compare_fields_derive"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [lib]
 proc-macro = true

common/compare_fields_derive/src/lib.rs

@@ -8,7 +8,7 @@ use syn::{parse_macro_input, DeriveInput};
 fn is_slice(field: &syn::Field) -> bool {
     field.attrs.iter().any(|attr| {
         attr.path.is_ident("compare_fields")
-            && attr.tokens.to_string().replace(" ", "") == "(as_slice)"
+            && attr.tokens.to_string().replace(' ', "") == "(as_slice)"
     })
 }
 

common/deposit_contract/Cargo.toml

@@ -2,7 +2,7 @@
 name = "deposit_contract"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 build = "build.rs"
 

common/directory/Cargo.toml

@@ -2,7 +2,7 @@
 name = "directory"
 version = "0.1.0"
 authors = ["pawan <pawandhananjay@gmail.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/eth2/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/eth2_config/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_config"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 types = { path = "../../consensus/types" }

common/eth2_interop_keypairs/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_interop_keypairs"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/eth2_network_config/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_network_config"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 build = "build.rs"
 

common/eth2_wallet_manager/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_wallet_manager"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/fallback/Cargo.toml

@@ -2,7 +2,7 @@
 name = "fallback"
 version = "0.1.0"
 authors = ["blacktemplar <blacktemplar@a1.net>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/filesystem/Cargo.toml

@@ -2,7 +2,7 @@
 name = "filesystem"
 version = "0.1.0"
 authors = ["Mark Mackey <mark@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/hashset_delay/Cargo.toml

@@ -2,7 +2,7 @@
 name = "hashset_delay"
 version = "0.2.0"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 futures = "0.3.7"

common/lighthouse_metrics/Cargo.toml

@@ -2,7 +2,7 @@
 name = "lighthouse_metrics"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/lighthouse_version/Cargo.toml

@@ -2,7 +2,7 @@
 name = "lighthouse_version"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/lockfile/Cargo.toml

@@ -2,7 +2,7 @@
 name = "lockfile"
 version = "0.1.0"
 authors = ["Michael Sproul <michael@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 fs2 = "0.4.3"

common/logging/Cargo.toml

@@ -2,7 +2,7 @@
 name = "logging"
 version = "0.2.0"
 authors = ["blacktemplar <blacktemplar@a1.net>"]
-edition = "2018"
+edition = "2021"
 
 [features]
 test_logger = [] # Print log output to stderr when running tests instead of dropping it

common/logging/tests/test.rs

@@ -3,13 +3,11 @@ use std::process::Command;
 use std::process::Output;
 
 fn run_cmd(cmd_line: &str) -> Result<Output, std::io::Error> {
-    let output;
     if cfg!(target_os = "windows") {
-        output = Command::new(r#"cmd"#).args(["/C", cmd_line]).output();
+        Command::new(r#"cmd"#).args(["/C", cmd_line]).output()
     } else {
-        output = Command::new(r#"sh"#).args(["-c", cmd_line]).output();
+        Command::new(r#"sh"#).args(["-c", cmd_line]).output()
     }
-    output
 }
 
 #[test]

common/lru_cache/Cargo.toml

@@ -2,7 +2,7 @@
 name = "lru_cache"
 version = "0.1.0"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 fnv = "1.0.7"

common/malloc_utils/Cargo.toml

@@ -2,7 +2,7 @@
 name = "malloc_utils"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/monitoring_api/Cargo.toml

@@ -2,7 +2,7 @@
 name = "monitoring_api"
 version = "0.1.0"
 authors = ["pawan <pawandhananjay@gmail.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/sensitive_url/Cargo.toml

@@ -2,7 +2,7 @@
 name = "sensitive_url"
 version = "0.1.0"
 authors = ["Mac L <mjladson@pm.me>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

common/slot_clock/Cargo.toml

@@ -2,7 +2,7 @@
 name = "slot_clock"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 types = { path = "../../consensus/types" }

common/target_check/Cargo.toml

@@ -2,7 +2,7 @@
 name = "target_check"
 version = "0.1.0"
 authors = ["Michael Sproul <michael@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 static_assertions = "1.1.0"

common/task_executor/Cargo.toml

@@ -2,7 +2,7 @@
 name = "task_executor"
 version = "0.1.0"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 tokio = { version = "1.14.0", features = ["rt"] }

common/test_random_derive/Cargo.toml

@@ -2,7 +2,7 @@
 name = "test_random_derive"
 version = "0.2.0"
 authors = ["thojest <thojest@gmail.com>"]
-edition = "2018"
+edition = "2021"
 description = "Procedural derive macros for implementation of TestRandom trait"
 
 [lib]

common/test_random_derive/src/lib.rs

@@ -10,7 +10,7 @@ use syn::{parse_macro_input, DeriveInput};
 /// The field attribute is: `#[test_random(default)]`
 fn should_use_default(field: &syn::Field) -> bool {
     field.attrs.iter().any(|attr| {
-        attr.path.is_ident("test_random") && attr.tokens.to_string().replace(" ", "") == "(default)"
+        attr.path.is_ident("test_random") && attr.tokens.to_string().replace(' ', "") == "(default)"
     })
 }
 

common/validator_dir/Cargo.toml

@@ -2,7 +2,7 @@
 name = "validator_dir"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [features]
 insecure_keys = []

common/warp_utils/Cargo.toml

@@ -2,7 +2,7 @@
 name = "warp_utils"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

consensus/cached_tree_hash/Cargo.toml

@@ -2,7 +2,7 @@
 name = "cached_tree_hash"
 version = "0.1.0"
 authors = ["Michael Sproul <michael@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 ethereum-types = "0.12.1"

consensus/cached_tree_hash/src/cache_arena.rs

@@ -127,7 +127,7 @@ impl<T: Encode + Decode> CacheArena<T> {
             .offsets
             .get(alloc_id + 1)
             .copied()
-            .unwrap_or_else(|| self.backing.len());
+            .unwrap_or(self.backing.len());
 
         Ok(end - start)
     }
@@ -168,7 +168,7 @@ impl<T: Encode + Decode> CacheArena<T> {
             .offsets
             .get(alloc_id + 1)
             .copied()
-            .unwrap_or_else(|| self.backing.len());
+            .unwrap_or(self.backing.len());
 
         Ok(start..end)
     }

consensus/fork_choice/Cargo.toml

@@ -2,7 +2,7 @@
 name = "fork_choice"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

consensus/fork_choice/src/fork_choice.rs

@@ -219,7 +219,7 @@ fn dequeue_attestations(
         queued_attestations
             .iter()
             .position(|a| a.slot >= current_slot)
-            .unwrap_or_else(|| queued_attestations.len()),
+            .unwrap_or(queued_attestations.len()),
     );
 
     std::mem::replace(queued_attestations, remaining)

consensus/fork_choice/tests/tests.rs

@@ -613,7 +613,7 @@ fn justified_balances() {
 }
 
 macro_rules! assert_invalid_block {
-    ($err: tt, $($error: pat) |+ $( if $guard: expr )?) => {
+    ($err: tt, $($error: pat_param) |+ $( if $guard: expr )?) => {
         assert!(
             matches!(
                 $err,
@@ -719,7 +719,7 @@ fn invalid_block_finalized_descendant() {
 }
 
 macro_rules! assert_invalid_attestation {
-    ($err: tt, $($error: pat) |+ $( if $guard: expr )?) => {
+    ($err: tt, $($error: pat_param) |+ $( if $guard: expr )?) => {
         assert!(
             matches!(
                 $err,

consensus/int_to_bytes/Cargo.toml

@@ -2,7 +2,7 @@
 name = "int_to_bytes"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 bytes = "1.0.1"

consensus/merkle_proof/Cargo.toml

@@ -2,7 +2,7 @@
 name = "merkle_proof"
 version = "0.2.0"
 authors = ["Michael Sproul <michael@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 ethereum-types = "0.12.1"

consensus/proto_array/Cargo.toml

@@ -2,7 +2,7 @@
 name = "proto_array"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [[bin]]
 name = "proto_array"

consensus/proto_array/src/proto_array.rs

@@ -313,7 +313,7 @@ impl ProtoArray {
             .indices
             .get(justified_root)
             .copied()
-            .ok_or_else(|| Error::JustifiedNodeUnknown(*justified_root))?;
+            .ok_or(Error::JustifiedNodeUnknown(*justified_root))?;
 
         let justified_node = self
             .nodes

consensus/safe_arith/Cargo.toml

@@ -2,7 +2,7 @@
 name = "safe_arith"
 version = "0.1.0"
 authors = ["Michael Sproul <michael@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

consensus/serde_utils/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_serde_utils"
 version = "0.1.1"
 authors = ["Paul Hauner <paul@paulhauner.com", "Michael Sproul <michael@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 description = "Serialization and deserialization utilities useful for JSON representations of Ethereum 2.0 types."
 license = "Apache-2.0"
 

consensus/serde_utils/src/u64_hex_be.rs

@@ -51,7 +51,7 @@ where
     let raw = hex::encode(num.to_be_bytes());
     let trimmed = raw.trim_start_matches('0');
 
-    let hex = if trimmed.is_empty() { "0" } else { &trimmed };
+    let hex = if trimmed.is_empty() { "0" } else { trimmed };
 
     serializer.serialize_str(&format!("0x{}", &hex))
 }

consensus/ssz/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_ssz"
 version = "0.4.1"
 authors = ["Paul Hauner <paul@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 description = "SimpleSerialize (SSZ) as used in Ethereum 2.0"
 license = "Apache-2.0"
 

consensus/ssz/src/decode.rs

@@ -187,12 +187,13 @@ impl<'a> SszDecoderBuilder<'a> {
             let start = self.items_index;
             self.items_index += ssz_fixed_len;
 
-            let slice = self.bytes.get(start..self.items_index).ok_or_else(|| {
-                DecodeError::InvalidByteLength {
-                    len: self.bytes.len(),
-                    expected: self.items_index,
-                }
-            })?;
+            let slice =
+                self.bytes
+                    .get(start..self.items_index)
+                    .ok_or(DecodeError::InvalidByteLength {
+                        len: self.bytes.len(),
+                        expected: self.items_index,
+                    })?;
 
             self.items.push(slice);
         } else {
@@ -347,12 +348,12 @@ pub fn split_union_bytes(bytes: &[u8]) -> Result<(UnionSelector, &[u8]), DecodeE
 /// Reads a `BYTES_PER_LENGTH_OFFSET`-byte length from `bytes`, where `bytes.len() >=
 /// BYTES_PER_LENGTH_OFFSET`.
 pub fn read_offset(bytes: &[u8]) -> Result<usize, DecodeError> {
-    decode_offset(bytes.get(0..BYTES_PER_LENGTH_OFFSET).ok_or_else(|| {
+    decode_offset(bytes.get(0..BYTES_PER_LENGTH_OFFSET).ok_or(
         DecodeError::InvalidLengthPrefix {
             len: bytes.len(),
             expected: BYTES_PER_LENGTH_OFFSET,
-        }
-    })?)
+        },
+    )?)
 }
 
 /// Decode bytes as a little-endian usize, returning an `Err` if `bytes.len() !=

consensus/ssz_derive/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_ssz_derive"
 version = "0.3.0"
 authors = ["Paul Hauner <paul@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 description = "Procedural derive macros to accompany the eth2_ssz crate."
 license = "Apache-2.0"
 

consensus/ssz_types/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_ssz_types"
 version = "0.2.2"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 description = "Provides types with unique properties required for SSZ serialization and Merklization."
 license = "Apache-2.0"
 

consensus/state_processing/Cargo.toml

@@ -2,7 +2,7 @@
 name = "state_processing"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>", "Michael Sproul <michael@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dev-dependencies]
 env_logger = "0.9.0"

consensus/state_processing/src/lib.rs

@@ -3,7 +3,7 @@
     not(test),
     deny(
         clippy::integer_arithmetic,
-        clippy::disallowed_method,
+        clippy::disallowed_methods,
         clippy::indexing_slicing,
         clippy::unwrap_used,
         clippy::expect_used,

consensus/state_processing/src/per_block_processing/signature_sets.rs

@@ -177,7 +177,7 @@ where
 
     Ok(SignatureSet::single_pubkey(
         block.body().randao_reveal(),
-        get_pubkey(proposer_index).ok_or_else(|| Error::ValidatorUnknown(proposer_index as u64))?,
+        get_pubkey(proposer_index).ok_or(Error::ValidatorUnknown(proposer_index as u64))?,
         message,
     ))
 }
@@ -199,15 +199,13 @@ where
         block_header_signature_set(
             state,
             &proposer_slashing.signed_header_1,
-            get_pubkey(proposer_index)
-                .ok_or_else(|| Error::ValidatorUnknown(proposer_index as u64))?,
+            get_pubkey(proposer_index).ok_or(Error::ValidatorUnknown(proposer_index as u64))?,
             spec,
         ),
         block_header_signature_set(
             state,
             &proposer_slashing.signed_header_2,
-            get_pubkey(proposer_index)
-                .ok_or_else(|| Error::ValidatorUnknown(proposer_index as u64))?,
+            get_pubkey(proposer_index).ok_or(Error::ValidatorUnknown(proposer_index as u64))?,
             spec,
         ),
     ))
@@ -363,7 +361,7 @@ where
 
     Ok(SignatureSet::single_pubkey(
         &signed_exit.signature,
-        get_pubkey(proposer_index).ok_or_else(|| Error::ValidatorUnknown(proposer_index as u64))?,
+        get_pubkey(proposer_index).ok_or(Error::ValidatorUnknown(proposer_index as u64))?,
         message,
     ))
 }
@@ -521,7 +519,7 @@ where
 {
     let mut pubkeys = Vec::with_capacity(T::SyncSubcommitteeSize::to_usize());
     for pubkey in pubkey_bytes {
-        pubkeys.push(get_pubkey(pubkey).ok_or_else(|| Error::ValidatorPubkeyUnknown(*pubkey))?);
+        pubkeys.push(get_pubkey(pubkey).ok_or(Error::ValidatorPubkeyUnknown(*pubkey))?);
     }
 
     let domain = spec.get_domain(epoch, Domain::SyncCommittee, fork, genesis_validators_root);

consensus/state_processing/src/per_epoch_processing/base/rewards_and_penalties.rs

@@ -4,7 +4,6 @@ use crate::per_epoch_processing::{
     Delta, Error,
 };
 use safe_arith::SafeArith;
-use std::array::IntoIter as ArrayIter;
 use types::{BeaconState, ChainSpec, EthSpec};
 
 /// Combination of several deltas for different components of an attestation reward.
@@ -30,13 +29,13 @@ impl AttestationDelta {
             inactivity_penalty_delta,
         } = self;
         let mut result = Delta::default();
-        for delta in ArrayIter::new([
+        for delta in [
             source_delta,
             target_delta,
             head_delta,
             inclusion_delay_delta,
             inactivity_penalty_delta,
-        ]) {
+        ] {
             result.combine(delta)?;
         }
         Ok(result)

consensus/swap_or_not_shuffle/Cargo.toml

@@ -2,7 +2,7 @@
 name = "swap_or_not_shuffle"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [[bench]]
 name = "benches"

consensus/tree_hash/Cargo.toml

@@ -2,7 +2,7 @@
 name = "tree_hash"
 version = "0.4.1"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 license = "Apache-2.0"
 description = "Efficient Merkle-hashing as used in Ethereum 2.0"
 

consensus/tree_hash/src/merkle_hasher.rs

@@ -376,8 +376,8 @@ mod test {
     fn compare_with_reference(leaves: &[Hash256], depth: usize) {
         let reference_bytes = leaves
             .iter()
-            .map(|hash| hash.as_bytes().to_vec())
-            .flatten()
+            .flat_map(|hash| hash.as_bytes())
+            .copied()
             .collect::<Vec<_>>();
 
         let reference_root = merkleize_padded(&reference_bytes, 1 << (depth - 1));

consensus/tree_hash_derive/Cargo.toml

@@ -2,7 +2,7 @@
 name = "tree_hash_derive"
 version = "0.4.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 description = "Procedural derive macros to accompany the tree_hash crate."
 license = "Apache-2.0"
 

consensus/tree_hash_derive/src/lib.rs

@@ -109,7 +109,7 @@ fn cached_tree_hash_attr_metas(attrs: &[Attribute]) -> Vec<Meta> {
 fn should_skip_hashing(field: &syn::Field) -> bool {
     field.attrs.iter().any(|attr| {
         attr.path.is_ident("tree_hash")
-            && attr.tokens.to_string().replace(" ", "") == "(skip_hashing)"
+            && attr.tokens.to_string().replace(' ', "") == "(skip_hashing)"
     })
 }
 

consensus/types/Cargo.toml

@@ -2,7 +2,7 @@
 name = "types"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>", "Age Manning <Age@AgeManning.com>"]
-edition = "2018"
+edition = "2021"
 
 [[bench]]
 name = "benches"

consensus/types/src/beacon_state/tree_hash_cache.rs

@@ -1,5 +1,5 @@
 #![allow(clippy::integer_arithmetic)]
-#![allow(clippy::disallowed_method)]
+#![allow(clippy::disallowed_methods)]
 #![allow(clippy::indexing_slicing)]
 
 use super::Error;

consensus/types/src/lib.rs

@@ -7,7 +7,7 @@
     not(test),
     deny(
         clippy::integer_arithmetic,
-        clippy::disallowed_method,
+        clippy::disallowed_methods,
         clippy::indexing_slicing
     )
 )]

crypto/bls/Cargo.toml

@@ -2,7 +2,7 @@
 name = "bls"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 eth2_ssz = "0.4.1"

crypto/eth2_hashing/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_hashing"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 license = "Apache-2.0"
 description = "Hashing primitives used in Ethereum 2.0"
 

crypto/eth2_key_derivation/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_key_derivation"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

crypto/eth2_key_derivation/src/derived_key.rs

@@ -148,8 +148,7 @@ fn parent_sk_to_lamport_pk(ikm: &[u8], index: u32) -> ZeroizeHash {
 
     lamports
         .iter()
-        .map(LamportSecretKey::iter_chunks)
-        .flatten()
+        .flat_map(LamportSecretKey::iter_chunks)
         .enumerate()
         .for_each(|(i, chunk)| {
             let mut hasher = Sha256::new();

crypto/eth2_keystore/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_keystore"
 version = "0.1.0"
 authors = ["Pawan Dhananjay <pawan@sigmaprime.io", "Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

crypto/eth2_wallet/Cargo.toml

@@ -2,7 +2,7 @@
 name = "eth2_wallet"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

lcli/Cargo.toml

@@ -3,7 +3,7 @@ name = "lcli"
 description = "Lighthouse CLI (modeled after zcli)"
 version = "2.1.3"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [features]
 portable = ["bls/supranational-portable"]

lcli/src/etl/block_efficiency.rs

@@ -74,9 +74,9 @@ async fn get_block_attestations_set<'a, T: EthSpec>(
             .graffiti()
             .as_utf8_lossy()
             // Remove commas and apostropes from graffiti to ensure correct CSV format.
-            .replace(",", "")
-            .replace("\"", "")
-            .replace("'", ""),
+            .replace(',', "")
+            .replace('"', "")
+            .replace('\'', ""),
     };
 
     let attestations = block.message().body().attestations();

lighthouse/Cargo.toml

@@ -2,7 +2,7 @@
 name = "lighthouse"
 version = "2.1.3"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 autotests = false
 
 [features]

lighthouse/environment/Cargo.toml

@@ -2,7 +2,7 @@
 name = "environment"
 version = "0.1.2"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 tokio = { version = "1.14.0", features = ["macros", "rt", "rt-multi-thread", "signal" ] }

slasher/Cargo.toml

@@ -2,7 +2,7 @@
 name = "slasher"
 version = "0.1.0"
 authors = ["Michael Sproul <michael@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 bincode = "1.3.1"

slasher/service/Cargo.toml

@@ -2,7 +2,7 @@
 name = "slasher_service"
 version = "0.1.0"
 authors = ["Michael Sproul <michael@sigmaprime.io>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 beacon_chain = { path = "../../beacon_node/beacon_chain" }

testing/ef_tests/Cargo.toml

@@ -2,7 +2,7 @@
 name = "ef_tests"
 version = "0.2.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
-edition = "2018"
+edition = "2021"
 
 [features]
 # `ef_tests` feature must be enabled to actually run the tests