From 0781fe1b4f70a9cdbfb09f5c7de1ebc567d5da5c Mon Sep 17 00:00:00 2001
From: Tao Zhu <82401714+taozhu-chicago@users.noreply.github.com>
Date: Wed, 19 May 2021 09:31:47 -0500
Subject: [PATCH] Upgrade Rust to 1.52.0 (#17096)

* Upgrade Rust to 1.52.0
update nightly_version to newly pushed docker image
fix clippy lint errors
1.52 comes with grcov 0.8.0, include this version to script

* upgrade to Rust 1.52.1

* disabling Serum from downstream projects until it is upgraded to Rust 1.52.1
---
 Cargo.lock                                    |   1 -
 ci/docker-rust-nightly/Dockerfile             |   2 +-
 ci/docker-rust/Dockerfile                     |   2 +-
 ci/rust-version.sh                            |   4 +-
 cli/src/checks.rs                             |  15 +-
 cli/src/lib.rs                                |   1 -
 cli/tests/program.rs                          |  22 +--
 client/src/rpc_client.rs                      |   2 +-
 core/src/banking_stage.rs                     |   6 +-
 core/src/cluster_info.rs                      |  12 +-
 core/src/consensus.rs                         |   2 +
 core/src/crds_gossip_pull.rs                  |  12 +-
 core/src/epoch_slots.rs                       |   4 +-
 core/src/gossip_service.rs                    |  20 +--
 core/src/heaviest_subtree_fork_choice.rs      |   6 +-
 core/src/lib.rs                               |   2 +-
 core/src/poh_recorder.rs                      |  50 ++-----
 core/src/retransmit_stage.rs                  |   4 +-
 core/src/sigverify_shreds.rs                  |   4 +-
 core/src/verified_vote_packets.rs             |   2 +-
 core/src/window_service.rs                    | 103 ++++++++-----
 core/tests/rpc.rs                             |   2 +-
 frozen-abi/macro/Cargo.toml                   |   1 -
 frozen-abi/macro/src/lib.rs                   |  39 -----
 ledger/src/blockstore.rs                      |  37 ++---
 ledger/src/blockstore/blockstore_purge.rs     |   2 +-
 ledger/src/entry.rs                           |  39 ++---
 ledger/src/lib.rs                             |   2 +-
 ledger/src/poh.rs                             | 138 ++++++++----------
 local-cluster/src/cluster_tests.rs            |   2 +-
 perf/src/cuda_runtime.rs                      |   2 +-
 perf/src/recycler.rs                          |   1 +
 perf/src/sigverify.rs                         |   4 +-
 programs/bpf/Cargo.lock                       |   1 -
 programs/bpf_loader/src/syscalls.rs           |   2 +
 programs/stake/src/lib.rs                     |   2 +-
 programs/stake/src/stake_state.rs             | 121 +++++++--------
 programs/vote/src/lib.rs                      |   2 +-
 .../optimistically_confirmed_bank_tracker.rs  |   8 +-
 rpc/src/rpc_subscriptions.rs                  |  18 +--
 runtime/src/accounts.rs                       |   1 +
 runtime/src/accounts_db.rs                    |   5 +-
 runtime/src/append_vec.rs                     |   4 +-
 runtime/src/bank.rs                           |  10 +-
 runtime/src/lib.rs                            |   2 +-
 runtime/src/message_processor.rs              |  14 +-
 scripts/build-downstream-projects.sh          |   2 +-
 scripts/coverage.sh                           |   2 +-
 sdk/program/src/message.rs                    |  12 +-
 sdk/program/src/sysvar/recent_blockhashes.rs  |   5 +-
 sdk/src/account.rs                            |   8 +-
 sdk/src/packet.rs                             |   1 +
 tokens/src/commands.rs                        |   1 +
 version/src/lib.rs                            |   2 +-
 54 files changed, 345 insertions(+), 423 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 9f9151a40f..2ed71fd23f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4519,7 +4519,6 @@ dependencies = [
 name = "solana-frozen-abi-macro"
 version = "1.7.0"
 dependencies = [
- "lazy_static",
  "proc-macro2 1.0.24",
  "quote 1.0.6",
  "rustc_version",
diff --git a/ci/docker-rust-nightly/Dockerfile b/ci/docker-rust-nightly/Dockerfile
index 4cf08b7cba..8d3f41255a 100644
--- a/ci/docker-rust-nightly/Dockerfile
+++ b/ci/docker-rust-nightly/Dockerfile
@@ -1,4 +1,4 @@
-FROM solanalabs/rust:1.51.0
+FROM solanalabs/rust:1.52.1
 ARG date
 
 RUN set -x \
diff --git a/ci/docker-rust/Dockerfile b/ci/docker-rust/Dockerfile
index bad2bd7150..950698e07d 100644
--- a/ci/docker-rust/Dockerfile
+++ b/ci/docker-rust/Dockerfile
@@ -1,6 +1,6 @@
 # Note: when the rust version is changed also modify
 # ci/rust-version.sh to pick up the new image tag
-FROM rust:1.51.0
+FROM rust:1.52.1
 
 # Add Google Protocol Buffers for Libra's metrics library.
 ENV PROTOC_VERSION 3.8.0
diff --git a/ci/rust-version.sh b/ci/rust-version.sh
index b8719f2800..5d0cdc5bd0 100644
--- a/ci/rust-version.sh
+++ b/ci/rust-version.sh
@@ -18,13 +18,13 @@
 if [[ -n $RUST_STABLE_VERSION ]]; then
   stable_version="$RUST_STABLE_VERSION"
 else
-  stable_version=1.51.0
+  stable_version=1.52.1
 fi
 
 if [[ -n $RUST_NIGHTLY_VERSION ]]; then
   nightly_version="$RUST_NIGHTLY_VERSION"
 else
-  nightly_version=2021-04-18
+  nightly_version=2021-05-18
 fi
 
 
diff --git a/cli/src/checks.rs b/cli/src/checks.rs
index 3a3898ee86..92a365c76d 100644
--- a/cli/src/checks.rs
+++ b/cli/src/checks.rs
@@ -231,18 +231,9 @@ mod tests {
         mocks.insert(RpcRequest::GetBalance, account_balance_response);
         let rpc_client = RpcClient::new_mock_with_mocks("".to_string(), mocks);
 
-        assert_eq!(
-            check_account_for_balance(&rpc_client, &pubkey, 1).unwrap(),
-            true
-        );
-        assert_eq!(
-            check_account_for_balance(&rpc_client, &pubkey, account_balance).unwrap(),
-            true
-        );
-        assert_eq!(
-            check_account_for_balance(&rpc_client, &pubkey, account_balance + 1).unwrap(),
-            false
-        );
+        assert!(check_account_for_balance(&rpc_client, &pubkey, 1).unwrap());
+        assert!(check_account_for_balance(&rpc_client, &pubkey, account_balance).unwrap());
+        assert!(!check_account_for_balance(&rpc_client, &pubkey, account_balance + 1).unwrap());
     }
 
     #[test]
diff --git a/cli/src/lib.rs b/cli/src/lib.rs
index 55d0b947f0..21596aa94c 100644
--- a/cli/src/lib.rs
+++ b/cli/src/lib.rs
@@ -10,7 +10,6 @@ macro_rules! ACCOUNT_STRING {
     };
 }
 
-#[macro_use]
 macro_rules! pubkey {
     ($arg:expr, $help:expr) => {
         $arg.takes_value(true)
diff --git a/cli/tests/program.rs b/cli/tests/program.rs
index 15d7e6ae83..5a83d0ea24 100644
--- a/cli/tests/program.rs
+++ b/cli/tests/program.rs
@@ -72,7 +72,7 @@ fn test_cli_program_deploy_non_upgradeable() {
     let account0 = rpc_client.get_account(&program_id).unwrap();
     assert_eq!(account0.lamports, minimum_balance_for_rent_exemption);
     assert_eq!(account0.owner, bpf_loader::id());
-    assert_eq!(account0.executable, true);
+    assert!(account0.executable);
     let mut file = File::open(pathbuf.to_str().unwrap().to_string()).unwrap();
     let mut elf = Vec::new();
     file.read_to_end(&mut elf).unwrap();
@@ -93,7 +93,7 @@ fn test_cli_program_deploy_non_upgradeable() {
         .unwrap();
     assert_eq!(account1.lamports, minimum_balance_for_rent_exemption);
     assert_eq!(account1.owner, bpf_loader::id());
-    assert_eq!(account1.executable, true);
+    assert!(account1.executable);
     assert_eq!(account1.data, account0.data);
 
     // Attempt to redeploy to the same address
@@ -129,7 +129,7 @@ fn test_cli_program_deploy_non_upgradeable() {
         .unwrap();
     assert_eq!(account2.lamports, 2 * minimum_balance_for_rent_exemption);
     assert_eq!(account2.owner, bpf_loader::id());
-    assert_eq!(account2.executable, true);
+    assert!(account2.executable);
     assert_eq!(account2.data, account0.data);
 }
 
@@ -289,7 +289,7 @@ fn test_cli_program_deploy_with_authority() {
     let program_account = rpc_client.get_account(&program_keypair.pubkey()).unwrap();
     assert_eq!(program_account.lamports, minimum_balance_for_program);
     assert_eq!(program_account.owner, bpf_loader_upgradeable::id());
-    assert_eq!(program_account.executable, true);
+    assert!(program_account.executable);
     let (programdata_pubkey, _) = Pubkey::find_program_address(
         &[program_keypair.pubkey().as_ref()],
         &bpf_loader_upgradeable::id(),
@@ -300,7 +300,7 @@ fn test_cli_program_deploy_with_authority() {
         minimum_balance_for_programdata
     );
     assert_eq!(programdata_account.owner, bpf_loader_upgradeable::id());
-    assert_eq!(programdata_account.executable, false);
+    assert!(!programdata_account.executable);
     assert_eq!(
         programdata_account.data[UpgradeableLoaderState::programdata_data_offset().unwrap()..],
         program_data[..]
@@ -332,7 +332,7 @@ fn test_cli_program_deploy_with_authority() {
     let program_account = rpc_client.get_account(&program_pubkey).unwrap();
     assert_eq!(program_account.lamports, minimum_balance_for_program);
     assert_eq!(program_account.owner, bpf_loader_upgradeable::id());
-    assert_eq!(program_account.executable, true);
+    assert!(program_account.executable);
     let (programdata_pubkey, _) =
         Pubkey::find_program_address(&[program_pubkey.as_ref()], &bpf_loader_upgradeable::id());
     let programdata_account = rpc_client.get_account(&programdata_pubkey).unwrap();
@@ -341,7 +341,7 @@ fn test_cli_program_deploy_with_authority() {
         minimum_balance_for_programdata
     );
     assert_eq!(programdata_account.owner, bpf_loader_upgradeable::id());
-    assert_eq!(programdata_account.executable, false);
+    assert!(!programdata_account.executable);
     assert_eq!(
         programdata_account.data[UpgradeableLoaderState::programdata_data_offset().unwrap()..],
         program_data[..]
@@ -364,7 +364,7 @@ fn test_cli_program_deploy_with_authority() {
     let program_account = rpc_client.get_account(&program_pubkey).unwrap();
     assert_eq!(program_account.lamports, minimum_balance_for_program);
     assert_eq!(program_account.owner, bpf_loader_upgradeable::id());
-    assert_eq!(program_account.executable, true);
+    assert!(program_account.executable);
     let (programdata_pubkey, _) =
         Pubkey::find_program_address(&[program_pubkey.as_ref()], &bpf_loader_upgradeable::id());
     let programdata_account = rpc_client.get_account(&programdata_pubkey).unwrap();
@@ -373,7 +373,7 @@ fn test_cli_program_deploy_with_authority() {
         minimum_balance_for_programdata
     );
     assert_eq!(programdata_account.owner, bpf_loader_upgradeable::id());
-    assert_eq!(programdata_account.executable, false);
+    assert!(!programdata_account.executable);
     assert_eq!(
         programdata_account.data[UpgradeableLoaderState::programdata_data_offset().unwrap()..],
         program_data[..]
@@ -418,7 +418,7 @@ fn test_cli_program_deploy_with_authority() {
     let program_account = rpc_client.get_account(&program_pubkey).unwrap();
     assert_eq!(program_account.lamports, minimum_balance_for_program);
     assert_eq!(program_account.owner, bpf_loader_upgradeable::id());
-    assert_eq!(program_account.executable, true);
+    assert!(program_account.executable);
     let (programdata_pubkey, _) =
         Pubkey::find_program_address(&[program_pubkey.as_ref()], &bpf_loader_upgradeable::id());
     let programdata_account = rpc_client.get_account(&programdata_pubkey).unwrap();
@@ -427,7 +427,7 @@ fn test_cli_program_deploy_with_authority() {
         minimum_balance_for_programdata
     );
     assert_eq!(programdata_account.owner, bpf_loader_upgradeable::id());
-    assert_eq!(programdata_account.executable, false);
+    assert!(!programdata_account.executable);
     assert_eq!(
         programdata_account.data[UpgradeableLoaderState::programdata_data_offset().unwrap()..],
         program_data[..]
diff --git a/client/src/rpc_client.rs b/client/src/rpc_client.rs
index 19585633a6..5f1d92740b 100644
--- a/client/src/rpc_client.rs
+++ b/client/src/rpc_client.rs
@@ -2034,7 +2034,7 @@ mod tests {
         // Send erroneous parameter
         let blockhash: ClientResult<String> =
             rpc_client.send(RpcRequest::GetRecentBlockhash, json!(["parameter"]));
-        assert_eq!(blockhash.is_err(), true);
+        assert!(blockhash.is_err());
     }
 
     #[test]
diff --git a/core/src/banking_stage.rs b/core/src/banking_stage.rs
index 518f668f15..6ef1ea4f10 100644
--- a/core/src/banking_stage.rs
+++ b/core/src/banking_stage.rs
@@ -1547,7 +1547,7 @@ mod tests {
                 .collect();
             trace!("done");
             assert_eq!(entries.len(), genesis_config.ticks_per_slot as usize);
-            assert_eq!(entries.verify(&start_hash), true);
+            assert!(entries.verify(&start_hash));
             assert_eq!(entries[entries.len() - 1].hash, bank.last_blockhash());
             banking_stage.join().unwrap();
         }
@@ -1656,7 +1656,7 @@ mod tests {
                     .map(|(_bank, (entry, _tick_height))| entry)
                     .collect();
 
-                assert_eq!(entries.verify(&blockhash), true);
+                assert!(entries.verify(&blockhash));
                 if !entries.is_empty() {
                     blockhash = entries.last().unwrap().hash;
                     for entry in entries {
@@ -2124,7 +2124,7 @@ mod tests {
             }
             trace!("done ticking");
 
-            assert_eq!(done, true);
+            assert!(done);
 
             let transactions = vec![system_transaction::transfer(
                 &mint_keypair,
diff --git a/core/src/cluster_info.rs b/core/src/cluster_info.rs
index 49660f1432..5393ef6651 100644
--- a/core/src/cluster_info.rs
+++ b/core/src/cluster_info.rs
@@ -2369,6 +2369,7 @@ impl ClusterInfo {
         }
     }
 
+    #[allow(clippy::needless_collect)]
     fn handle_batch_push_messages(
         &self,
         messages: Vec<(Pubkey, Vec<CrdsValue>)>,
@@ -3229,6 +3230,7 @@ mod tests {
     }
 
     #[test]
+    #[allow(clippy::needless_collect)]
     fn test_handle_ping_messages() {
         let mut rng = rand::thread_rng();
         let this_node = Arc::new(Keypair::new());
@@ -3583,7 +3585,7 @@ mod tests {
             .unwrap()
             .new_push_messages(cluster_info.drain_push_queue(), timestamp());
         // there should be some pushes ready
-        assert_eq!(push_messages.is_empty(), false);
+        assert!(!push_messages.is_empty());
         push_messages
             .values()
             .for_each(|v| v.par_iter().for_each(|v| assert!(v.verify())));
@@ -3934,6 +3936,7 @@ mod tests {
     }
 
     #[test]
+    #[allow(clippy::needless_collect)]
     fn test_split_messages_packet_size() {
         // Test that if a value is smaller than payload size but too large to be wrapped in a vec
         // that it is still dropped
@@ -3967,9 +3970,10 @@ mod tests {
         let expected_len = (NUM_VALUES + num_values_per_payload - 1) / num_values_per_payload;
         let msgs = vec![value; NUM_VALUES as usize];
 
-        let split: Vec<_> =
-            ClusterInfo::split_gossip_messages(PUSH_MESSAGE_MAX_PAYLOAD_SIZE, msgs).collect();
-        assert!(split.len() as u64 <= expected_len);
+        assert!(
+            ClusterInfo::split_gossip_messages(PUSH_MESSAGE_MAX_PAYLOAD_SIZE, msgs).count() as u64
+                <= expected_len
+        );
     }
 
     #[test]
diff --git a/core/src/consensus.rs b/core/src/consensus.rs
index 6f11649fc8..beda8f9905 100644
--- a/core/src/consensus.rs
+++ b/core/src/consensus.rs
@@ -91,6 +91,8 @@ pub type Stake = u64;
 pub type VotedStakes = HashMap<Slot, Stake>;
 pub type PubkeyVotes = Vec<(Pubkey, Slot)>;
 
+// lint warning "bank_weight is never read"
+#[allow(dead_code)]
 pub(crate) struct ComputedBankState {
     pub voted_stakes: VotedStakes,
     pub total_stake: Stake,
diff --git a/core/src/crds_gossip_pull.rs b/core/src/crds_gossip_pull.rs
index d74eceaada..64d4dbc9c7 100644
--- a/core/src/crds_gossip_pull.rs
+++ b/core/src/crds_gossip_pull.rs
@@ -1476,11 +1476,13 @@ mod test {
         }
     }
     fn run_test_mask(mask_bits: u32) {
-        let masks: Vec<_> = (0..2u64.pow(mask_bits))
-            .map(|seed| CrdsFilter::compute_mask(seed, mask_bits))
-            .dedup()
-            .collect();
-        assert_eq!(masks.len(), 2u64.pow(mask_bits) as usize)
+        assert_eq!(
+            (0..2u64.pow(mask_bits))
+                .map(|seed| CrdsFilter::compute_mask(seed, mask_bits))
+                .dedup()
+                .count(),
+            2u64.pow(mask_bits) as usize
+        )
     }
 
     #[test]
diff --git a/core/src/epoch_slots.rs b/core/src/epoch_slots.rs
index d4ce59a640..e3061e5e90 100644
--- a/core/src/epoch_slots.rs
+++ b/core/src/epoch_slots.rs
@@ -382,7 +382,7 @@ mod tests {
         assert_eq!(slots.to_slots(1), vec![1, 2, 10]);
         assert_eq!(slots.to_slots(2), vec![2, 10]);
         assert_eq!(slots.to_slots(3), vec![10]);
-        assert_eq!(slots.to_slots(11).is_empty(), true);
+        assert!(slots.to_slots(11).is_empty());
     }
     #[test]
     fn test_epoch_slots_compressed() {
@@ -452,7 +452,7 @@ mod tests {
         assert_eq!(slots.wallclock, 1);
         assert_eq!(slots.to_slots(0), range);
         assert_eq!(slots.to_slots(4999), vec![4999]);
-        assert_eq!(slots.to_slots(5000).is_empty(), true);
+        assert!(slots.to_slots(5000).is_empty());
     }
     #[test]
     fn test_epoch_slots_fill_sparce_range() {
diff --git a/core/src/gossip_service.rs b/core/src/gossip_service.rs
index d73b24dca9..1d28cda0b4 100644
--- a/core/src/gossip_service.rs
+++ b/core/src/gossip_service.rs
@@ -342,19 +342,19 @@ mod tests {
         let spy_ref = Arc::new(cluster_info);
 
         let (met_criteria, secs, _, tvu_peers) = spy(spy_ref.clone(), None, Some(1), None, None);
-        assert_eq!(met_criteria, false);
+        assert!(!met_criteria);
         assert_eq!(secs, 1);
         assert_eq!(tvu_peers, spy_ref.tvu_peers());
 
         // Find num_nodes
         let (met_criteria, _, _, _) = spy(spy_ref.clone(), Some(1), None, None, None);
-        assert_eq!(met_criteria, true);
+        assert!(met_criteria);
         let (met_criteria, _, _, _) = spy(spy_ref.clone(), Some(2), None, None, None);
-        assert_eq!(met_criteria, true);
+        assert!(met_criteria);
 
         // Find specific node by pubkey
         let (met_criteria, _, _, _) = spy(spy_ref.clone(), None, None, Some(peer0), None);
-        assert_eq!(met_criteria, true);
+        assert!(met_criteria);
         let (met_criteria, _, _, _) = spy(
             spy_ref.clone(),
             None,
@@ -362,13 +362,13 @@ mod tests {
             Some(solana_sdk::pubkey::new_rand()),
             None,
         );
-        assert_eq!(met_criteria, false);
+        assert!(!met_criteria);
 
         // Find num_nodes *and* specific node by pubkey
         let (met_criteria, _, _, _) = spy(spy_ref.clone(), Some(1), None, Some(peer0), None);
-        assert_eq!(met_criteria, true);
+        assert!(met_criteria);
         let (met_criteria, _, _, _) = spy(spy_ref.clone(), Some(3), Some(0), Some(peer0), None);
-        assert_eq!(met_criteria, false);
+        assert!(!met_criteria);
         let (met_criteria, _, _, _) = spy(
             spy_ref.clone(),
             Some(1),
@@ -376,12 +376,12 @@ mod tests {
             Some(solana_sdk::pubkey::new_rand()),
             None,
         );
-        assert_eq!(met_criteria, false);
+        assert!(!met_criteria);
 
         // Find specific node by gossip address
         let (met_criteria, _, _, _) =
             spy(spy_ref.clone(), None, None, None, Some(&peer0_info.gossip));
-        assert_eq!(met_criteria, true);
+        assert!(met_criteria);
 
         let (met_criteria, _, _, _) = spy(
             spy_ref,
@@ -390,6 +390,6 @@ mod tests {
             None,
             Some(&"1.1.1.1:1234".parse().unwrap()),
         );
-        assert_eq!(met_criteria, false);
+        assert!(!met_criteria);
     }
 }
diff --git a/core/src/heaviest_subtree_fork_choice.rs b/core/src/heaviest_subtree_fork_choice.rs
index 538ed432c5..fb1f10eac0 100644
--- a/core/src/heaviest_subtree_fork_choice.rs
+++ b/core/src/heaviest_subtree_fork_choice.rs
@@ -2685,7 +2685,7 @@ mod test {
         let mut tower = Tower::new_for_tests(10, 0.9);
         tower.record_vote(1, Hash::default());
 
-        assert_eq!(tower.is_stray_last_vote(), false);
+        assert!(!tower.is_stray_last_vote());
         assert_eq!(
             heaviest_subtree_fork_choice.heaviest_slot_on_same_voted_fork(&tower),
             Some((2, Hash::default()))
@@ -2700,7 +2700,7 @@ mod test {
             .adjust_lockouts_after_replay(0, &slot_history)
             .unwrap();
 
-        assert_eq!(tower.is_stray_last_vote(), true);
+        assert!(tower.is_stray_last_vote());
         assert_eq!(
             heaviest_subtree_fork_choice.heaviest_slot_on_same_voted_fork(&tower),
             Some((2, Hash::default()))
@@ -2712,7 +2712,7 @@ mod test {
             .adjust_lockouts_after_replay(0, &slot_history)
             .unwrap();
 
-        assert_eq!(tower.is_stray_last_vote(), true);
+        assert!(tower.is_stray_last_vote());
         assert_eq!(
             heaviest_subtree_fork_choice.heaviest_slot_on_same_voted_fork(&tower),
             None
diff --git a/core/src/lib.rs b/core/src/lib.rs
index 8ecc953a30..d418689864 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -1,4 +1,4 @@
-#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
+#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(min_specialization))]
 #![allow(clippy::integer_arithmetic)]
 //! The `solana` library implements the Solana high-performance blockchain architecture.
 //! It includes a full Rust implementation of the architecture (see
diff --git a/core/src/poh_recorder.rs b/core/src/poh_recorder.rs
index b6fdac5fe0..6753049a1a 100644
--- a/core/src/poh_recorder.rs
+++ b/core/src/poh_recorder.rs
@@ -1413,7 +1413,7 @@ mod tests {
 
             let bootstrap_validator_id = leader_schedule_cache.slot_leader_at(0, None).unwrap();
 
-            assert_eq!(poh_recorder.reached_leader_tick(0), true);
+            assert!(poh_recorder.reached_leader_tick(0));
 
             let grace_ticks = bank.ticks_per_slot() * MAX_GRACE_SLOTS;
             let new_tick_height = NUM_CONSECUTIVE_LEADER_SLOTS * bank.ticks_per_slot();
@@ -1475,11 +1475,11 @@ mod tests {
             );
 
             // Test that with no next leader slot, we don't reach the leader slot
-            assert_eq!(poh_recorder.reached_leader_slot().0, false);
+            assert!(!poh_recorder.reached_leader_slot().0);
 
             // Test that with no next leader slot in reset(), we don't reach the leader slot
             poh_recorder.reset(bank.last_blockhash(), 0, None);
-            assert_eq!(poh_recorder.reached_leader_slot().0, false);
+            assert!(!poh_recorder.reached_leader_slot().0);
 
             // Provide a leader slot one slot down
             poh_recorder.reset(bank.last_blockhash(), 0, Some((2, 2)));
@@ -1507,13 +1507,13 @@ mod tests {
                 .unwrap();
 
             // Test that we don't reach the leader slot because of grace ticks
-            assert_eq!(poh_recorder.reached_leader_slot().0, false);
+            assert!(!poh_recorder.reached_leader_slot().0);
 
             // reset poh now. we should immediately be leader
             poh_recorder.reset(bank.last_blockhash(), 1, Some((2, 2)));
             let (reached_leader_slot, grace_ticks, leader_slot, ..) =
                 poh_recorder.reached_leader_slot();
-            assert_eq!(reached_leader_slot, true);
+            assert!(reached_leader_slot);
             assert_eq!(grace_ticks, 0);
             assert_eq!(leader_slot, 2);
 
@@ -1527,7 +1527,7 @@ mod tests {
             }
 
             // We are not the leader yet, as expected
-            assert_eq!(poh_recorder.reached_leader_slot().0, false);
+            assert!(!poh_recorder.reached_leader_slot().0);
 
             // Send the grace ticks
             for _ in 0..bank.ticks_per_slot() / GRACE_TICKS_FACTOR {
@@ -1537,7 +1537,7 @@ mod tests {
             // We should be the leader now
             let (reached_leader_slot, grace_ticks, leader_slot, ..) =
                 poh_recorder.reached_leader_slot();
-            assert_eq!(reached_leader_slot, true);
+            assert!(reached_leader_slot);
             assert_eq!(grace_ticks, bank.ticks_per_slot() / GRACE_TICKS_FACTOR);
             assert_eq!(leader_slot, 3);
 
@@ -1551,13 +1551,13 @@ mod tests {
             }
 
             // We are not the leader yet, as expected
-            assert_eq!(poh_recorder.reached_leader_slot().0, false);
+            assert!(!poh_recorder.reached_leader_slot().0);
             poh_recorder.reset(bank.last_blockhash(), 3, Some((4, 4)));
 
             // without sending more ticks, we should be leader now
             let (reached_leader_slot, grace_ticks, leader_slot, ..) =
                 poh_recorder.reached_leader_slot();
-            assert_eq!(reached_leader_slot, true);
+            assert!(reached_leader_slot);
             assert_eq!(grace_ticks, 0);
             assert_eq!(leader_slot, 4);
 
@@ -1575,7 +1575,7 @@ mod tests {
             // We are overdue to lead
             let (reached_leader_slot, grace_ticks, leader_slot, ..) =
                 poh_recorder.reached_leader_slot();
-            assert_eq!(reached_leader_slot, true);
+            assert!(reached_leader_slot);
             assert_eq!(grace_ticks, overshoot_factor * bank.ticks_per_slot());
             assert_eq!(leader_slot, 9);
         }
@@ -1605,47 +1605,29 @@ mod tests {
             );
 
             // Test that with no leader slot, we don't reach the leader tick
-            assert_eq!(
-                poh_recorder.would_be_leader(2 * bank.ticks_per_slot()),
-                false
-            );
+            assert!(!poh_recorder.would_be_leader(2 * bank.ticks_per_slot()));
 
             poh_recorder.reset(bank.last_blockhash(), 0, None);
 
-            assert_eq!(
-                poh_recorder.would_be_leader(2 * bank.ticks_per_slot()),
-                false
-            );
+            assert!(!poh_recorder.would_be_leader(2 * bank.ticks_per_slot()));
 
             // We reset with leader slot after 3 slots
             let bank_slot = bank.slot() + 3;
             poh_recorder.reset(bank.last_blockhash(), 0, Some((bank_slot, bank_slot)));
 
             // Test that the node won't be leader in next 2 slots
-            assert_eq!(
-                poh_recorder.would_be_leader(2 * bank.ticks_per_slot()),
-                false
-            );
+            assert!(!poh_recorder.would_be_leader(2 * bank.ticks_per_slot()));
 
             // Test that the node will be leader in next 3 slots
-            assert_eq!(
-                poh_recorder.would_be_leader(3 * bank.ticks_per_slot()),
-                true
-            );
+            assert!(poh_recorder.would_be_leader(3 * bank.ticks_per_slot()));
 
-            assert_eq!(
-                poh_recorder.would_be_leader(2 * bank.ticks_per_slot()),
-                false
-            );
+            assert!(!poh_recorder.would_be_leader(2 * bank.ticks_per_slot()));
 
             // Move the bank up a slot (so that max_tick_height > slot 0's tick_height)
             let bank = Arc::new(Bank::new_from_parent(&bank, &Pubkey::default(), 1));
             // If we set the working bank, the node should be leader within next 2 slots
             poh_recorder.set_bank(&bank);
-            assert_eq!(
-                poh_recorder.would_be_leader(2 * bank.ticks_per_slot()),
-                true
-            );
+            assert!(poh_recorder.would_be_leader(2 * bank.ticks_per_slot()));
         }
     }
 
diff --git a/core/src/retransmit_stage.rs b/core/src/retransmit_stage.rs
index 07d7075da8..f7716c2370 100644
--- a/core/src/retransmit_stage.rs
+++ b/core/src/retransmit_stage.rs
@@ -739,7 +739,7 @@ mod tests {
         let mut packets = Packets::new(vec![]);
         solana_streamer::packet::recv_from(&mut packets, &me_retransmit, 1).unwrap();
         assert_eq!(packets.packets.len(), 1);
-        assert_eq!(packets.packets[0].meta.repair, false);
+        assert!(!packets.packets[0].meta.repair);
 
         let mut repair = packet.clone();
         repair.meta.repair = true;
@@ -752,7 +752,7 @@ mod tests {
         let mut packets = Packets::new(vec![]);
         solana_streamer::packet::recv_from(&mut packets, &me_retransmit, 1).unwrap();
         assert_eq!(packets.packets.len(), 1);
-        assert_eq!(packets.packets[0].meta.repair, false);
+        assert!(!packets.packets[0].meta.repair);
     }
 
     #[test]
diff --git a/core/src/sigverify_shreds.rs b/core/src/sigverify_shreds.rs
index 98ff0bd2b6..d3403d6523 100644
--- a/core/src/sigverify_shreds.rs
+++ b/core/src/sigverify_shreds.rs
@@ -153,7 +153,7 @@ pub mod tests {
         batch[0].packets[1].meta.size = shred.payload.len();
 
         let rv = verifier.verify_batch(batch);
-        assert_eq!(rv[0].packets[0].meta.discard, false);
-        assert_eq!(rv[0].packets[1].meta.discard, true);
+        assert!(!rv[0].packets[0].meta.discard);
+        assert!(rv[0].packets[1].meta.discard);
     }
 }
diff --git a/core/src/verified_vote_packets.rs b/core/src/verified_vote_packets.rs
index 9136b668c7..761136e8f3 100644
--- a/core/src/verified_vote_packets.rs
+++ b/core/src/verified_vote_packets.rs
@@ -105,7 +105,7 @@ mod tests {
         // Only the nonempty packet had a timestamp greater than 1
         let (new_update_version, updates) = verified_vote_packets.get_latest_votes(1);
         assert_eq!(new_update_version, 2);
-        assert_eq!(updates.packets.is_empty(), false);
+        assert!(!updates.packets.is_empty());
 
         // If the given timestamp is greater than all timestamps in any update,
         // returned timestamp should be the same as the given timestamp, and
diff --git a/core/src/window_service.rs b/core/src/window_service.rs
index a407fc061e..457dc88bf1 100644
--- a/core/src/window_service.rs
+++ b/core/src/window_service.rs
@@ -671,63 +671,94 @@ mod test {
         let mut shreds = local_entries_to_shred(&[Entry::default()], 0, 0, &leader_keypair);
 
         // with a Bank for slot 0, shred continues
-        assert_eq!(
-            should_retransmit_and_persist(&shreds[0], Some(bank.clone()), &cache, &me_id, 0, 0),
-            true
-        );
+        assert!(should_retransmit_and_persist(
+            &shreds[0],
+            Some(bank.clone()),
+            &cache,
+            &me_id,
+            0,
+            0
+        ));
         // with the wrong shred_version, shred gets thrown out
-        assert_eq!(
-            should_retransmit_and_persist(&shreds[0], Some(bank.clone()), &cache, &me_id, 0, 1),
-            false
-        );
+        assert!(!should_retransmit_and_persist(
+            &shreds[0],
+            Some(bank.clone()),
+            &cache,
+            &me_id,
+            0,
+            1
+        ));
 
         // If it's a coding shred, test that slot >= root
         let (common, coding) = Shredder::new_coding_shred_header(5, 5, 5, 6, 6, 0);
         let mut coding_shred =
             Shred::new_empty_from_header(common, DataShredHeader::default(), coding);
         Shredder::sign_shred(&leader_keypair, &mut coding_shred);
-        assert_eq!(
-            should_retransmit_and_persist(&coding_shred, Some(bank.clone()), &cache, &me_id, 0, 0),
-            true
-        );
-        assert_eq!(
-            should_retransmit_and_persist(&coding_shred, Some(bank.clone()), &cache, &me_id, 5, 0),
-            true
-        );
-        assert_eq!(
-            should_retransmit_and_persist(&coding_shred, Some(bank.clone()), &cache, &me_id, 6, 0),
-            false
-        );
+        assert!(should_retransmit_and_persist(
+            &coding_shred,
+            Some(bank.clone()),
+            &cache,
+            &me_id,
+            0,
+            0
+        ));
+        assert!(should_retransmit_and_persist(
+            &coding_shred,
+            Some(bank.clone()),
+            &cache,
+            &me_id,
+            5,
+            0
+        ));
+        assert!(!should_retransmit_and_persist(
+            &coding_shred,
+            Some(bank.clone()),
+            &cache,
+            &me_id,
+            6,
+            0
+        ));
 
         // with a Bank and no idea who leader is, shred gets thrown out
         shreds[0].set_slot(MINIMUM_SLOTS_PER_EPOCH as u64 * 3);
-        assert_eq!(
-            should_retransmit_and_persist(&shreds[0], Some(bank.clone()), &cache, &me_id, 0, 0),
-            false
-        );
+        assert!(!should_retransmit_and_persist(
+            &shreds[0],
+            Some(bank.clone()),
+            &cache,
+            &me_id,
+            0,
+            0
+        ));
 
         // with a shred where shred.slot() == root, shred gets thrown out
         let slot = MINIMUM_SLOTS_PER_EPOCH as u64 * 3;
         let shreds = local_entries_to_shred(&[Entry::default()], slot, slot - 1, &leader_keypair);
-        assert_eq!(
-            should_retransmit_and_persist(&shreds[0], Some(bank.clone()), &cache, &me_id, slot, 0),
-            false
-        );
+        assert!(!should_retransmit_and_persist(
+            &shreds[0],
+            Some(bank.clone()),
+            &cache,
+            &me_id,
+            slot,
+            0
+        ));
 
         // with a shred where shred.parent() < root, shred gets thrown out
         let slot = MINIMUM_SLOTS_PER_EPOCH as u64 * 3;
         let shreds =
             local_entries_to_shred(&[Entry::default()], slot + 1, slot - 1, &leader_keypair);
-        assert_eq!(
-            should_retransmit_and_persist(&shreds[0], Some(bank), &cache, &me_id, slot, 0),
-            false
-        );
+        assert!(!should_retransmit_and_persist(
+            &shreds[0],
+            Some(bank),
+            &cache,
+            &me_id,
+            slot,
+            0
+        ));
 
         // if the shred came back from me, it doesn't continue, whether or not I have a bank
-        assert_eq!(
-            should_retransmit_and_persist(&shreds[0], None, &cache, &me_id, 0, 0),
-            false
-        );
+        assert!(!should_retransmit_and_persist(
+            &shreds[0], None, &cache, &me_id, 0, 0
+        ));
     }
 
     #[test]
diff --git a/core/tests/rpc.rs b/core/tests/rpc.rs
index 6258e90af9..ee8291f8d1 100644
--- a/core/tests/rpc.rs
+++ b/core/tests/rpc.rs
@@ -100,7 +100,7 @@ fn test_rpc_send_tx() {
         sleep(Duration::from_millis(500));
     }
 
-    assert_eq!(confirmed_tx, true);
+    assert!(confirmed_tx);
 
     use solana_account_decoder::UiAccountEncoding;
     use solana_client::rpc_config::RpcAccountInfoConfig;
diff --git a/frozen-abi/macro/Cargo.toml b/frozen-abi/macro/Cargo.toml
index e6b90b1798..eaf31a2c37 100644
--- a/frozen-abi/macro/Cargo.toml
+++ b/frozen-abi/macro/Cargo.toml
@@ -16,7 +16,6 @@ proc-macro = true
 proc-macro2 = "1.0"
 quote = "1.0"
 syn = { version = "1.0", features = ["full", "extra-traits"] }
-lazy_static = "1.4.0"
 
 [build-dependencies]
 rustc_version = "0.2"
diff --git a/frozen-abi/macro/src/lib.rs b/frozen-abi/macro/src/lib.rs
index 20ef3ba885..bd285a826c 100644
--- a/frozen-abi/macro/src/lib.rs
+++ b/frozen-abi/macro/src/lib.rs
@@ -1,9 +1,5 @@
 extern crate proc_macro;
 
-#[cfg(RUSTC_WITH_SPECIALIZATION)]
-#[macro_use]
-extern crate lazy_static;
-
 // This file littered with these essential cfgs so ensure them.
 #[cfg(not(any(RUSTC_WITH_SPECIALIZATION, RUSTC_WITHOUT_SPECIALIZATION)))]
 compile_error!("rustc_version is missing in build dependency and build.rs is not specified");
@@ -71,37 +67,6 @@ fn filter_allow_attrs(attrs: &mut Vec<Attribute>) {
     });
 }
 
-#[allow(deprecated)]
-#[cfg(RUSTC_WITH_SPECIALIZATION)]
-fn quote_for_specialization_detection() -> TokenStream2 {
-    lazy_static! {
-        static ref SPECIALIZATION_DETECTOR_INJECTED: std::sync::atomic::AtomicBool =
-            std::sync::atomic::AtomicBool::new(false);
-    }
-
-    if !SPECIALIZATION_DETECTOR_INJECTED.compare_and_swap(
-        false,
-        true,
-        std::sync::atomic::Ordering::AcqRel,
-    ) {
-        quote! {
-            mod specialization_detector {
-                trait SpecializedTrait {
-                    fn specialized_fn() {}
-                }
-                impl<T: Sized> SpecializedTrait for T {
-                    default fn specialized_fn() {}
-                }
-                impl<T: Sized + Default> SpecializedTrait for T {
-                    fn specialized_fn() {}
-                }
-            }
-        }
-    } else {
-        quote! {}
-    }
-}
-
 #[cfg(RUSTC_WITH_SPECIALIZATION)]
 fn derive_abi_sample_enum_type(input: ItemEnum) -> TokenStream {
     let type_name = &input.ident;
@@ -162,10 +127,8 @@ fn derive_abi_sample_enum_type(input: ItemEnum) -> TokenStream {
     let mut attrs = input.attrs.clone();
     filter_allow_attrs(&mut attrs);
     let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
-    let injection = quote_for_specialization_detection();
 
     let result = quote! {
-        #injection
         #[automatically_derived]
         #( #attrs )*
         impl #impl_generics ::solana_frozen_abi::abi_example::AbiExample for #type_name #ty_generics #where_clause {
@@ -216,10 +179,8 @@ fn derive_abi_sample_struct_type(input: ItemStruct) -> TokenStream {
     filter_allow_attrs(&mut attrs);
     let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
     let turbofish = ty_generics.as_turbofish();
-    let injection = quote_for_specialization_detection();
 
     let result = quote! {
-        #injection
         #[automatically_derived]
         #( #attrs )*
         impl #impl_generics ::solana_frozen_abi::abi_example::AbiExample for #type_name #ty_generics #where_clause {
diff --git a/ledger/src/blockstore.rs b/ledger/src/blockstore.rs
index cd9d5bae8b..3a6528ffdd 100644
--- a/ledger/src/blockstore.rs
+++ b/ledger/src/blockstore.rs
@@ -1200,7 +1200,8 @@ impl Blockstore {
         just_inserted_data_shreds.insert((slot, shred_index), shred);
         index_meta_working_set_entry.did_insert_occur = true;
         slot_meta_entry.did_insert_occur = true;
-        if !erasure_metas.contains_key(&(slot, set_index)) {
+        if let std::collections::hash_map::Entry::Vacant(_) = erasure_metas.entry((slot, set_index))
+        {
             if let Some(meta) = self
                 .erasure_meta_cf
                 .get((slot, set_index))
@@ -5381,17 +5382,14 @@ pub mod tests {
                     panic!("Shred in unexpected format")
                 }
             };
-            assert_eq!(
-                blockstore.should_insert_data_shred(
-                    &shred7,
-                    &slot_meta,
-                    &HashMap::new(),
-                    &last_root,
-                    None,
-                    false
-                ),
+            assert!(!blockstore.should_insert_data_shred(
+                &shred7,
+                &slot_meta,
+                &HashMap::new(),
+                &last_root,
+                None,
                 false
-            );
+            ));
             assert!(blockstore.has_duplicate_shreds_in_slot(0));
 
             // Insert all pending shreds
@@ -5405,17 +5403,14 @@ pub mod tests {
             } else {
                 panic!("Shred in unexpected format")
             }
-            assert_eq!(
-                blockstore.should_insert_data_shred(
-                    &shred7,
-                    &slot_meta,
-                    &HashMap::new(),
-                    &last_root,
-                    None,
-                    false
-                ),
+            assert!(!blockstore.should_insert_data_shred(
+                &shred7,
+                &slot_meta,
+                &HashMap::new(),
+                &last_root,
+                None,
                 false
-            );
+            ));
         }
         Blockstore::destroy(&blockstore_path).expect("Expected successful database destruction");
     }
diff --git a/ledger/src/blockstore/blockstore_purge.rs b/ledger/src/blockstore/blockstore_purge.rs
index bd7e41e122..4fe38a3f4f 100644
--- a/ledger/src/blockstore/blockstore_purge.rs
+++ b/ledger/src/blockstore/blockstore_purge.rs
@@ -115,7 +115,7 @@ impl Blockstore {
             .batch()
             .expect("Database Error: Failed to get write batch");
         // delete range cf is not inclusive
-        let to_slot = to_slot.checked_add(1).unwrap_or(std::u64::MAX);
+        let to_slot = to_slot.saturating_add(1);
 
         let mut delete_range_timer = Measure::start("delete_range");
         let mut columns_purged = self
diff --git a/ledger/src/entry.rs b/ledger/src/entry.rs
index 9697d15778..f918bb37bc 100644
--- a/ledger/src/entry.rs
+++ b/ledger/src/entry.rs
@@ -868,17 +868,14 @@ mod tests {
         solana_logger::setup();
         let zero = Hash::default();
         let one = hash(&zero.as_ref());
-        assert_eq!(vec![][..].verify(&zero), true); // base case
-        assert_eq!(vec![Entry::new_tick(0, &zero)][..].verify(&zero), true); // singleton case 1
-        assert_eq!(vec![Entry::new_tick(0, &zero)][..].verify(&one), false); // singleton case 2, bad
-        assert_eq!(
-            vec![next_entry(&zero, 0, vec![]); 2][..].verify(&zero),
-            true
-        ); // inductive step
+        assert!(vec![][..].verify(&zero)); // base case
+        assert!(vec![Entry::new_tick(0, &zero)][..].verify(&zero)); // singleton case 1
+        assert!(!vec![Entry::new_tick(0, &zero)][..].verify(&one)); // singleton case 2, bad
+        assert!(vec![next_entry(&zero, 0, vec![]); 2][..].verify(&zero)); // inductive step
 
         let mut bad_ticks = vec![next_entry(&zero, 0, vec![]); 2];
         bad_ticks[1].hash = one;
-        assert_eq!(bad_ticks.verify(&zero), false); // inductive step, bad
+        assert!(!bad_ticks.verify(&zero)); // inductive step, bad
     }
 
     #[test]
@@ -887,18 +884,18 @@ mod tests {
         let zero = Hash::default();
         let one = hash(&zero.as_ref());
         let two = hash(&one.as_ref());
-        assert_eq!(vec![][..].verify(&one), true); // base case
-        assert_eq!(vec![Entry::new_tick(1, &two)][..].verify(&one), true); // singleton case 1
-        assert_eq!(vec![Entry::new_tick(1, &two)][..].verify(&two), false); // singleton case 2, bad
+        assert!(vec![][..].verify(&one)); // base case
+        assert!(vec![Entry::new_tick(1, &two)][..].verify(&one)); // singleton case 1
+        assert!(!vec![Entry::new_tick(1, &two)][..].verify(&two)); // singleton case 2, bad
 
         let mut ticks = vec![next_entry(&one, 1, vec![])];
         ticks.push(next_entry(&ticks.last().unwrap().hash, 1, vec![]));
-        assert_eq!(ticks.verify(&one), true); // inductive step
+        assert!(ticks.verify(&one)); // inductive step
 
         let mut bad_ticks = vec![next_entry(&one, 1, vec![])];
         bad_ticks.push(next_entry(&bad_ticks.last().unwrap().hash, 1, vec![]));
         bad_ticks[1].hash = one;
-        assert_eq!(bad_ticks.verify(&one), false); // inductive step, bad
+        assert!(!bad_ticks.verify(&one)); // inductive step, bad
     }
 
     #[test]
@@ -910,15 +907,9 @@ mod tests {
         let alice_pubkey = Keypair::new();
         let tx0 = create_sample_payment(&alice_pubkey, one);
         let tx1 = create_sample_timestamp(&alice_pubkey, one);
-        assert_eq!(vec![][..].verify(&one), true); // base case
-        assert_eq!(
-            vec![next_entry(&one, 1, vec![tx0.clone()])][..].verify(&one),
-            true
-        ); // singleton case 1
-        assert_eq!(
-            vec![next_entry(&one, 1, vec![tx0.clone()])][..].verify(&two),
-            false
-        ); // singleton case 2, bad
+        assert!(vec![][..].verify(&one)); // base case
+        assert!(vec![next_entry(&one, 1, vec![tx0.clone()])][..].verify(&one)); // singleton case 1
+        assert!(!vec![next_entry(&one, 1, vec![tx0.clone()])][..].verify(&two)); // singleton case 2, bad
 
         let mut ticks = vec![next_entry(&one, 1, vec![tx0.clone()])];
         ticks.push(next_entry(
@@ -926,12 +917,12 @@ mod tests {
             1,
             vec![tx1.clone()],
         ));
-        assert_eq!(ticks.verify(&one), true); // inductive step
+        assert!(ticks.verify(&one)); // inductive step
 
         let mut bad_ticks = vec![next_entry(&one, 1, vec![tx0])];
         bad_ticks.push(next_entry(&bad_ticks.last().unwrap().hash, 1, vec![tx1]));
         bad_ticks[1].hash = one;
-        assert_eq!(bad_ticks.verify(&one), false); // inductive step, bad
+        assert!(!bad_ticks.verify(&one)); // inductive step, bad
     }
 
     #[test]
diff --git a/ledger/src/lib.rs b/ledger/src/lib.rs
index 603f585da3..b7542b47df 100644
--- a/ledger/src/lib.rs
+++ b/ledger/src/lib.rs
@@ -1,4 +1,4 @@
-#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
+#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(min_specialization))]
 #![allow(clippy::integer_arithmetic)]
 #[macro_use]
 extern crate solana_bpf_loader_program;
diff --git a/ledger/src/poh.rs b/ledger/src/poh.rs
index c230afc8b9..0ade8d7a75 100644
--- a/ledger/src/poh.rs
+++ b/ledger/src/poh.rs
@@ -197,95 +197,77 @@ mod tests {
         let one_with_zero = hashv(&[&zero.as_ref(), &zero.as_ref()]);
 
         let mut poh = Poh::new(zero, None);
-        assert_eq!(
-            verify(
-                zero,
-                &[
-                    (poh.tick().unwrap(), None),
-                    (poh.record(zero).unwrap(), Some(zero)),
-                    (poh.record(zero).unwrap(), Some(zero)),
-                    (poh.tick().unwrap(), None),
-                ],
-            ),
-            true
-        );
+        assert!(verify(
+            zero,
+            &[
+                (poh.tick().unwrap(), None),
+                (poh.record(zero).unwrap(), Some(zero)),
+                (poh.record(zero).unwrap(), Some(zero)),
+                (poh.tick().unwrap(), None),
+            ],
+        ));
 
-        assert_eq!(
-            verify(
-                zero,
-                &[(
-                    PohEntry {
-                        num_hashes: 1,
-                        hash: one,
-                    },
-                    None
-                )],
-            ),
-            true
-        );
-        assert_eq!(
-            verify(
-                zero,
-                &[(
-                    PohEntry {
-                        num_hashes: 2,
-                        hash: two,
-                    },
-                    None
-                )]
-            ),
-            true
-        );
+        assert!(verify(
+            zero,
+            &[(
+                PohEntry {
+                    num_hashes: 1,
+                    hash: one,
+                },
+                None
+            )],
+        ));
+        assert!(verify(
+            zero,
+            &[(
+                PohEntry {
+                    num_hashes: 2,
+                    hash: two,
+                },
+                None
+            )]
+        ));
 
-        assert_eq!(
-            verify(
-                zero,
-                &[(
+        assert!(verify(
+            zero,
+            &[(
+                PohEntry {
+                    num_hashes: 1,
+                    hash: one_with_zero,
+                },
+                Some(zero)
+            )]
+        ));
+        assert!(!verify(
+            zero,
+            &[(
+                PohEntry {
+                    num_hashes: 1,
+                    hash: zero,
+                },
+                None
+            )]
+        ));
+
+        assert!(verify(
+            zero,
+            &[
+                (
                     PohEntry {
                         num_hashes: 1,
                         hash: one_with_zero,
                     },
                     Some(zero)
-                )]
-            ),
-            true
-        );
-        assert_eq!(
-            verify(
-                zero,
-                &[(
+                ),
+                (
                     PohEntry {
                         num_hashes: 1,
-                        hash: zero,
+                        hash: hash(&one_with_zero.as_ref()),
                     },
                     None
-                )]
-            ),
-            false
-        );
-
-        assert_eq!(
-            verify(
-                zero,
-                &[
-                    (
-                        PohEntry {
-                            num_hashes: 1,
-                            hash: one_with_zero,
-                        },
-                        Some(zero)
-                    ),
-                    (
-                        PohEntry {
-                            num_hashes: 1,
-                            hash: hash(&one_with_zero.as_ref()),
-                        },
-                        None
-                    )
-                ]
-            ),
-            true
-        );
+                )
+            ]
+        ));
     }
 
     #[test]
diff --git a/local-cluster/src/cluster_tests.rs b/local-cluster/src/cluster_tests.rs
index a11b5d3912..6a9b0fe01c 100644
--- a/local-cluster/src/cluster_tests.rs
+++ b/local-cluster/src/cluster_tests.rs
@@ -384,7 +384,7 @@ fn get_and_verify_slot_entries(
     last_entry: &Hash,
 ) -> Vec<Entry> {
     let entries = blockstore.get_slot_entries(slot, 0).unwrap();
-    assert_eq!(entries.verify(last_entry), true);
+    assert!(entries.verify(last_entry));
     entries
 }
 
diff --git a/perf/src/cuda_runtime.rs b/perf/src/cuda_runtime.rs
index 158fe8d369..3b5b054c1a 100644
--- a/perf/src/cuda_runtime.rs
+++ b/perf/src/cuda_runtime.rs
@@ -315,7 +315,7 @@ mod tests {
         assert_eq!(mem[0], 50);
         assert_eq!(mem[1], 10);
         assert_eq!(mem.len(), 2);
-        assert_eq!(mem.is_empty(), false);
+        assert!(!mem.is_empty());
         let mut iter = mem.iter();
         assert_eq!(*iter.next().unwrap(), 50);
         assert_eq!(*iter.next().unwrap(), 10);
diff --git a/perf/src/recycler.rs b/perf/src/recycler.rs
index 8885d8c300..1dce8e74c2 100644
--- a/perf/src/recycler.rs
+++ b/perf/src/recycler.rs
@@ -71,6 +71,7 @@ fn warm_recyclers() -> bool {
 }
 
 impl<T: Default + Reset + Sized> Recycler<T> {
+    #[allow(clippy::needless_collect)]
     pub fn warmed(num: usize, size_hint: usize) -> Self {
         let new = Self::default();
         if warm_recyclers() {
diff --git a/perf/src/sigverify.rs b/perf/src/sigverify.rs
index a012f1bead..a965107192 100644
--- a/perf/src/sigverify.rs
+++ b/perf/src/sigverify.rs
@@ -495,9 +495,9 @@ mod tests {
         batch.packets.push(Packet::default());
         let mut batches: Vec<Packets> = vec![batch];
         mark_disabled(&mut batches, &[vec![0]]);
-        assert_eq!(batches[0].packets[0].meta.discard, true);
+        assert!(batches[0].packets[0].meta.discard);
         mark_disabled(&mut batches, &[vec![1]]);
-        assert_eq!(batches[0].packets[0].meta.discard, false);
+        assert!(!batches[0].packets[0].meta.discard);
     }
 
     #[test]
diff --git a/programs/bpf/Cargo.lock b/programs/bpf/Cargo.lock
index 1d96b31097..9e73d4a6c0 100644
--- a/programs/bpf/Cargo.lock
+++ b/programs/bpf/Cargo.lock
@@ -3245,7 +3245,6 @@ dependencies = [
 name = "solana-frozen-abi-macro"
 version = "1.7.0"
 dependencies = [
- "lazy_static",
  "proc-macro2 1.0.24",
  "quote 1.0.6",
  "rustc_version",
diff --git a/programs/bpf_loader/src/syscalls.rs b/programs/bpf_loader/src/syscalls.rs
index 039f89a1fd..456c400f27 100644
--- a/programs/bpf_loader/src/syscalls.rs
+++ b/programs/bpf_loader/src/syscalls.rs
@@ -2810,6 +2810,8 @@ mod tests {
         let bytes1 = "Gaggablaghblagh!";
         let bytes2 = "flurbos";
 
+        // lint warns field addr and len "never read"
+        #[allow(dead_code)]
         struct MockSlice {
             pub addr: u64,
             pub len: usize,
diff --git a/programs/stake/src/lib.rs b/programs/stake/src/lib.rs
index 23438bf8c8..f93ed51656 100644
--- a/programs/stake/src/lib.rs
+++ b/programs/stake/src/lib.rs
@@ -1,4 +1,4 @@
-#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
+#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(min_specialization))]
 #![allow(clippy::integer_arithmetic)]
 use solana_sdk::genesis_config::GenesisConfig;
 
diff --git a/programs/stake/src/stake_state.rs b/programs/stake/src/stake_state.rs
index 82eebeb4cc..81cc94e3fd 100644
--- a/programs/stake/src/stake_state.rs
+++ b/programs/stake/src/stake_state.rs
@@ -1881,22 +1881,16 @@ mod tests {
 
     #[test]
     fn test_stake_is_bootstrap() {
-        assert_eq!(
-            Delegation {
-                activation_epoch: std::u64::MAX,
-                ..Delegation::default()
-            }
-            .is_bootstrap(),
-            true
-        );
-        assert_eq!(
-            Delegation {
-                activation_epoch: 0,
-                ..Delegation::default()
-            }
-            .is_bootstrap(),
-            false
-        );
+        assert!(Delegation {
+            activation_epoch: std::u64::MAX,
+            ..Delegation::default()
+        }
+        .is_bootstrap());
+        assert!(!Delegation {
+            activation_epoch: 0,
+            ..Delegation::default()
+        }
+        .is_bootstrap());
     }
 
     #[test]
@@ -5719,65 +5713,50 @@ mod tests {
             custodian,
         };
         // neither time
-        assert_eq!(
-            lockup.is_in_force(
-                &Clock {
-                    epoch: 0,
-                    unix_timestamp: 0,
-                    ..Clock::default()
-                },
-                None
-            ),
-            true
-        );
+        assert!(lockup.is_in_force(
+            &Clock {
+                epoch: 0,
+                unix_timestamp: 0,
+                ..Clock::default()
+            },
+            None
+        ));
         // not timestamp
-        assert_eq!(
-            lockup.is_in_force(
-                &Clock {
-                    epoch: 2,
-                    unix_timestamp: 0,
-                    ..Clock::default()
-                },
-                None
-            ),
-            true
-        );
+        assert!(lockup.is_in_force(
+            &Clock {
+                epoch: 2,
+                unix_timestamp: 0,
+                ..Clock::default()
+            },
+            None
+        ));
         // not epoch
-        assert_eq!(
-            lockup.is_in_force(
-                &Clock {
-                    epoch: 0,
-                    unix_timestamp: 2,
-                    ..Clock::default()
-                },
-                None
-            ),
-            true
-        );
+        assert!(lockup.is_in_force(
+            &Clock {
+                epoch: 0,
+                unix_timestamp: 2,
+                ..Clock::default()
+            },
+            None
+        ));
         // both, no custodian
-        assert_eq!(
-            lockup.is_in_force(
-                &Clock {
-                    epoch: 1,
-                    unix_timestamp: 1,
-                    ..Clock::default()
-                },
-                None
-            ),
-            false
-        );
+        assert!(!lockup.is_in_force(
+            &Clock {
+                epoch: 1,
+                unix_timestamp: 1,
+                ..Clock::default()
+            },
+            None
+        ));
         // neither, but custodian
-        assert_eq!(
-            lockup.is_in_force(
-                &Clock {
-                    epoch: 0,
-                    unix_timestamp: 0,
-                    ..Clock::default()
-                },
-                Some(&custodian),
-            ),
-            false,
-        );
+        assert!(!lockup.is_in_force(
+            &Clock {
+                epoch: 0,
+                unix_timestamp: 0,
+                ..Clock::default()
+            },
+            Some(&custodian),
+        ));
     }
 
     #[test]
diff --git a/programs/vote/src/lib.rs b/programs/vote/src/lib.rs
index 57e55b52dd..ad9cf9f89c 100644
--- a/programs/vote/src/lib.rs
+++ b/programs/vote/src/lib.rs
@@ -1,4 +1,4 @@
-#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
+#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(min_specialization))]
 #![allow(clippy::integer_arithmetic)]
 
 pub mod authorized_voters;
diff --git a/rpc/src/optimistically_confirmed_bank_tracker.rs b/rpc/src/optimistically_confirmed_bank_tracker.rs
index de9278ca0a..62ab533105 100644
--- a/rpc/src/optimistically_confirmed_bank_tracker.rs
+++ b/rpc/src/optimistically_confirmed_bank_tracker.rs
@@ -260,7 +260,7 @@ mod tests {
         );
         assert_eq!(optimistically_confirmed_bank.read().unwrap().bank.slot(), 2);
         assert_eq!(pending_optimistically_confirmed_banks.len(), 1);
-        assert_eq!(pending_optimistically_confirmed_banks.contains(&3), true);
+        assert!(pending_optimistically_confirmed_banks.contains(&3));
 
         // Test bank will only be cached when frozen
         let bank3 = bank_forks.read().unwrap().get(3).unwrap().clone();
@@ -286,7 +286,7 @@ mod tests {
         );
         assert_eq!(optimistically_confirmed_bank.read().unwrap().bank.slot(), 3);
         assert_eq!(pending_optimistically_confirmed_banks.len(), 1);
-        assert_eq!(pending_optimistically_confirmed_banks.contains(&4), true);
+        assert!(pending_optimistically_confirmed_banks.contains(&4));
 
         let bank4 = bank_forks.read().unwrap().get(4).unwrap().clone();
         let bank5 = Bank::new_from_parent(&bank4, &Pubkey::default(), 5);
@@ -301,7 +301,7 @@ mod tests {
         );
         assert_eq!(optimistically_confirmed_bank.read().unwrap().bank.slot(), 5);
         assert_eq!(pending_optimistically_confirmed_banks.len(), 0);
-        assert_eq!(pending_optimistically_confirmed_banks.contains(&4), false);
+        assert!(!pending_optimistically_confirmed_banks.contains(&4));
 
         // Banks <= root do not get added to pending list, even if not frozen
         let bank5 = bank_forks.read().unwrap().get(5).unwrap().clone();
@@ -323,6 +323,6 @@ mod tests {
         );
         assert_eq!(optimistically_confirmed_bank.read().unwrap().bank.slot(), 5);
         assert_eq!(pending_optimistically_confirmed_banks.len(), 0);
-        assert_eq!(pending_optimistically_confirmed_banks.contains(&6), false);
+        assert!(!pending_optimistically_confirmed_banks.contains(&6));
     }
 }
diff --git a/rpc/src/rpc_subscriptions.rs b/rpc/src/rpc_subscriptions.rs
index 2ede992eaa..70d7e50ba3 100644
--- a/rpc/src/rpc_subscriptions.rs
+++ b/rpc/src/rpc_subscriptions.rs
@@ -1968,18 +1968,18 @@ pub(crate) mod tests {
         assert_eq!(subscriptions.get(&0).unwrap().len(), 2);
         assert_eq!(subscriptions.get(&1).unwrap().len(), 1);
 
-        assert_eq!(
-            remove_subscription(&mut subscriptions, &SubscriptionId::Number(0)),
-            true
-        );
+        assert!(remove_subscription(
+            &mut subscriptions,
+            &SubscriptionId::Number(0)
+        ));
         assert_eq!(subscriptions.len(), num_keys as usize);
         assert_eq!(subscriptions.get(&0).unwrap().len(), 1);
-        assert_eq!(
-            remove_subscription(&mut subscriptions, &SubscriptionId::Number(0)),
-            false
-        );
+        assert!(!remove_subscription(
+            &mut subscriptions,
+            &SubscriptionId::Number(0)
+        ));
 
-        assert_eq!(remove_subscription(&mut subscriptions, &extra_sub_id), true);
+        assert!(remove_subscription(&mut subscriptions, &extra_sub_id));
         assert_eq!(subscriptions.len(), (num_keys - 1) as usize);
         assert!(subscriptions.get(&0).is_none());
     }
diff --git a/runtime/src/accounts.rs b/runtime/src/accounts.rs
index 56d122cd57..d6223ac722 100644
--- a/runtime/src/accounts.rs
+++ b/runtime/src/accounts.rs
@@ -833,6 +833,7 @@ impl Accounts {
     /// This function will prevent multiple threads from modifying the same account state at the
     /// same time
     #[must_use]
+    #[allow(clippy::needless_collect)]
     pub fn lock_accounts<'a>(
         &self,
         txs: impl Iterator<Item = &'a Transaction>,
diff --git a/runtime/src/accounts_db.rs b/runtime/src/accounts_db.rs
index 68dde3af02..e368208fe9 100644
--- a/runtime/src/accounts_db.rs
+++ b/runtime/src/accounts_db.rs
@@ -3203,6 +3203,7 @@ impl AccountsDb {
         }
     }
 
+    #[allow(clippy::needless_collect)]
     fn purge_slots(&self, slots: &HashSet<Slot>) {
         // `add_root()` should be called first
         let mut safety_checks_elapsed = Measure::start("safety_checks_elapsed");
@@ -6502,7 +6503,7 @@ pub mod tests {
         let mut pubkeys: Vec<Pubkey> = vec![];
         create_account(&accounts, &mut pubkeys, 0, 100, 0, 0);
         update_accounts(&accounts, &pubkeys, 0, 99);
-        assert_eq!(check_storage(&accounts, 0, 100), true);
+        assert!(check_storage(&accounts, 0, 100));
     }
 
     #[test]
@@ -7100,7 +7101,7 @@ pub mod tests {
 
         // do some updates to those accounts and re-check
         modify_accounts(&accounts, &pubkeys, 0, 100, 2);
-        assert_eq!(check_storage(&accounts, 0, 100), true);
+        assert!(check_storage(&accounts, 0, 100));
         check_accounts(&accounts, &pubkeys, 0, 100, 2);
         accounts.get_accounts_delta_hash(0);
         accounts.add_root(0);
diff --git a/runtime/src/append_vec.rs b/runtime/src/append_vec.rs
index ae18f94a5e..fe38721fd6 100644
--- a/runtime/src/append_vec.rs
+++ b/runtime/src/append_vec.rs
@@ -883,7 +883,7 @@ pub mod tests {
             let executable_bool: &bool = &account.account_meta.executable;
             // Depending on use, *executable_bool can be truthy or falsy due to direct memory manipulation
             // assert_eq! thinks *executable_bool is equal to false but the if condition thinks it's not, contradictorily.
-            assert_eq!(*executable_bool, false);
+            assert!(!*executable_bool);
             const FALSE: bool = false; // keep clippy happy
             if *executable_bool == FALSE {
                 panic!("This didn't occur if this test passed.");
@@ -894,7 +894,7 @@ pub mod tests {
         // we can NOT observe crafted value by value
         {
             let executable_bool: bool = account.account_meta.executable;
-            assert_eq!(executable_bool, false);
+            assert!(!executable_bool);
             assert_eq!(account.get_executable_byte(), 0); // Wow, not crafted_executable!
         }
 
diff --git a/runtime/src/bank.rs b/runtime/src/bank.rs
index 2bc902ccdb..90317eedd5 100644
--- a/runtime/src/bank.rs
+++ b/runtime/src/bank.rs
@@ -8777,15 +8777,15 @@ pub(crate) mod tests {
         let tx_transfer_mint_to_1 =
             system_transaction::transfer(&mint_keypair, &key1.pubkey(), 1, genesis_config.hash());
         assert_eq!(bank.process_transaction(&tx_transfer_mint_to_1), Ok(()));
-        assert_eq!(bank.is_delta.load(Relaxed), true);
+        assert!(bank.is_delta.load(Relaxed));
 
         let bank1 = new_from_parent(&bank);
         let hash1 = bank1.hash_internal_state();
-        assert_eq!(bank1.is_delta.load(Relaxed), false);
+        assert!(!bank1.is_delta.load(Relaxed));
         assert_ne!(hash1, bank.hash());
         // ticks don't make a bank into a delta or change its state unless a block boundary is crossed
         bank1.register_tick(&Hash::default());
-        assert_eq!(bank1.is_delta.load(Relaxed), false);
+        assert!(!bank1.is_delta.load(Relaxed));
         assert_eq!(bank1.hash_internal_state(), hash1);
     }
 
@@ -8796,13 +8796,13 @@ pub(crate) mod tests {
         let key1 = Keypair::new();
 
         // The zeroth bank is empty becasue there are no transactions
-        assert_eq!(bank0.is_empty(), true);
+        assert!(bank0.is_empty());
 
         // Set is_delta to true, bank is no longer empty
         let tx_transfer_mint_to_1 =
             system_transaction::transfer(&mint_keypair, &key1.pubkey(), 1, genesis_config.hash());
         assert_eq!(bank0.process_transaction(&tx_transfer_mint_to_1), Ok(()));
-        assert_eq!(bank0.is_empty(), false);
+        assert!(!bank0.is_empty());
     }
 
     #[test]
diff --git a/runtime/src/lib.rs b/runtime/src/lib.rs
index 6cbc020c9a..825075b0bd 100644
--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -1,4 +1,4 @@
-#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
+#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(min_specialization))]
 #![allow(clippy::integer_arithmetic)]
 pub mod accounts;
 pub mod accounts_background_service;
diff --git a/runtime/src/message_processor.rs b/runtime/src/message_processor.rs
index 1027befc77..07dcfd1ddb 100644
--- a/runtime/src/message_processor.rs
+++ b/runtime/src/message_processor.rs
@@ -1389,22 +1389,22 @@ mod tests {
     fn test_is_zeroed() {
         const ZEROS_LEN: usize = 1024;
         let mut buf = [0; ZEROS_LEN];
-        assert_eq!(PreAccount::is_zeroed(&buf), true);
+        assert!(PreAccount::is_zeroed(&buf));
         buf[0] = 1;
-        assert_eq!(PreAccount::is_zeroed(&buf), false);
+        assert!(!PreAccount::is_zeroed(&buf));
 
         let mut buf = [0; ZEROS_LEN - 1];
-        assert_eq!(PreAccount::is_zeroed(&buf), true);
+        assert!(PreAccount::is_zeroed(&buf));
         buf[0] = 1;
-        assert_eq!(PreAccount::is_zeroed(&buf), false);
+        assert!(!PreAccount::is_zeroed(&buf));
 
         let mut buf = [0; ZEROS_LEN + 1];
-        assert_eq!(PreAccount::is_zeroed(&buf), true);
+        assert!(PreAccount::is_zeroed(&buf));
         buf[0] = 1;
-        assert_eq!(PreAccount::is_zeroed(&buf), false);
+        assert!(!PreAccount::is_zeroed(&buf));
 
         let buf = vec![];
-        assert_eq!(PreAccount::is_zeroed(&buf), true);
+        assert!(PreAccount::is_zeroed(&buf));
     }
 
     #[test]
diff --git a/scripts/build-downstream-projects.sh b/scripts/build-downstream-projects.sh
index f3a4117b6a..f8218c02d0 100755
--- a/scripts/build-downstream-projects.sh
+++ b/scripts/build-downstream-projects.sh
@@ -101,4 +101,4 @@ EOF
 
 _ example_helloworld
 _ spl
-_ serum_dex
+# _ serum_dex
diff --git a/scripts/coverage.sh b/scripts/coverage.sh
index 3fd6a13890..3b241041b8 100755
--- a/scripts/coverage.sh
+++ b/scripts/coverage.sh
@@ -10,7 +10,7 @@ if ! command -v grcov; then
   exit 1
 fi
 
-if [[ ! "$(grcov --version)" =~ 0.[67].1 ]]; then
+if [[ ! "$(grcov --version)" =~ 0.[678].[01] ]]; then
   echo Error: Required grcov version not installed
 
   echo "Installed version: $(grcov --version)"
diff --git a/sdk/program/src/message.rs b/sdk/program/src/message.rs
index 853ac9229b..98728dc7d9 100644
--- a/sdk/program/src/message.rs
+++ b/sdk/program/src/message.rs
@@ -865,12 +865,12 @@ mod tests {
             instructions: vec![],
         };
         let demote_sysvar_write_locks = true;
-        assert_eq!(message.is_writable(0, demote_sysvar_write_locks), true);
-        assert_eq!(message.is_writable(1, demote_sysvar_write_locks), false);
-        assert_eq!(message.is_writable(2, demote_sysvar_write_locks), false);
-        assert_eq!(message.is_writable(3, demote_sysvar_write_locks), true);
-        assert_eq!(message.is_writable(4, demote_sysvar_write_locks), true);
-        assert_eq!(message.is_writable(5, demote_sysvar_write_locks), false);
+        assert!(message.is_writable(0, demote_sysvar_write_locks));
+        assert!(!message.is_writable(1, demote_sysvar_write_locks));
+        assert!(!message.is_writable(2, demote_sysvar_write_locks));
+        assert!(message.is_writable(3, demote_sysvar_write_locks));
+        assert!(message.is_writable(4, demote_sysvar_write_locks));
+        assert!(!message.is_writable(5, demote_sysvar_write_locks));
     }
 
     #[test]
diff --git a/sdk/program/src/sysvar/recent_blockhashes.rs b/sdk/program/src/sysvar/recent_blockhashes.rs
index f3b1649ef9..93fee5e4dc 100644
--- a/sdk/program/src/sysvar/recent_blockhashes.rs
+++ b/sdk/program/src/sysvar/recent_blockhashes.rs
@@ -133,11 +133,10 @@ pub fn create_test_recent_blockhashes(start: usize) -> RecentBlockhashes {
             )
         })
         .collect();
-    let bhq: Vec<_> = blocks
+    blocks
         .iter()
         .map(|(i, hash, fee_calc)| IterItem(*i, hash, fee_calc))
-        .collect();
-    bhq.into_iter().collect()
+        .collect()
 }
 
 #[cfg(test)]
diff --git a/sdk/src/account.rs b/sdk/src/account.rs
index 195ff71bc5..4d6d397e1f 100644
--- a/sdk/src/account.rs
+++ b/sdk/src/account.rs
@@ -700,8 +700,8 @@ pub mod tests {
         assert_eq!(account.data().len(), 2);
         assert_eq!(account.owner, key);
         assert_eq!(account.owner(), &key);
-        assert_eq!(account.executable, true);
-        assert_eq!(account.executable(), true);
+        assert!(account.executable);
+        assert!(account.executable());
         assert_eq!(account.rent_epoch, 4);
         assert_eq!(account.rent_epoch(), 4);
         let account = account2;
@@ -711,8 +711,8 @@ pub mod tests {
         assert_eq!(account.data().len(), 2);
         assert_eq!(account.owner, key);
         assert_eq!(account.owner(), &key);
-        assert_eq!(account.executable, true);
-        assert_eq!(account.executable(), true);
+        assert!(account.executable);
+        assert!(account.executable());
         assert_eq!(account.rent_epoch, 4);
         assert_eq!(account.rent_epoch(), 4);
     }
diff --git a/sdk/src/packet.rs b/sdk/src/packet.rs
index d09601b7f8..4366217798 100644
--- a/sdk/src/packet.rs
+++ b/sdk/src/packet.rs
@@ -72,6 +72,7 @@ impl fmt::Debug for Packet {
     }
 }
 
+#[allow(clippy::uninit_assumed_init)]
 impl Default for Packet {
     fn default() -> Packet {
         Packet {
diff --git a/tokens/src/commands.rs b/tokens/src/commands.rs
index 340c530cfa..29e83b662a 100644
--- a/tokens/src/commands.rs
+++ b/tokens/src/commands.rs
@@ -423,6 +423,7 @@ fn distribute_allocations(
     Ok(())
 }
 
+#[allow(clippy::needless_collect)]
 fn read_allocations(
     input_csv: &str,
     transfer_amount: Option<u64>,
diff --git a/version/src/lib.rs b/version/src/lib.rs
index 351c765dd4..85afcd95c4 100644
--- a/version/src/lib.rs
+++ b/version/src/lib.rs
@@ -1,4 +1,4 @@
-#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(specialization))]
+#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(min_specialization))]
 
 extern crate serde_derive;
 use serde_derive::{Deserialize, Serialize};