chore: Apply Clippy lint collection_is_never_used

stackslib/src/burnchains/tests/burnchain.rs

@@ -698,32 +698,21 @@ fn test_burn_snapshot_sequence() {
         initial_reward_start_block: first_block_height,
     };
 
-    let mut leader_private_keys = vec![];
     let mut leader_public_keys = vec![];
     let mut leader_bitcoin_public_keys = vec![];
-    let mut leader_bitcoin_addresses = vec![];
 
     for i in 0..32 {
         let mut csprng: ThreadRng = thread_rng();
         let vrf_privkey = VRFPrivateKey(ed25519_dalek::SigningKey::generate(&mut csprng));
         let vrf_pubkey = VRFPublicKey::from_private(&vrf_privkey);
 
-        let privkey_hex = vrf_privkey.to_hex();
-        leader_private_keys.push(privkey_hex);
-
         let pubkey_hex = vrf_pubkey.to_hex();
         leader_public_keys.push(pubkey_hex);
 
         let bitcoin_privkey = Secp256k1PrivateKey::new();
         let bitcoin_publickey = BitcoinPublicKey::from_private(&bitcoin_privkey);
 
         leader_bitcoin_public_keys.push(to_hex(&bitcoin_publickey.to_bytes()));
-
-        leader_bitcoin_addresses.push(BitcoinAddress::from_bytes_legacy(
-            BitcoinNetworkType::Testnet,
-            LegacyBitcoinAddressType::PublicKeyHash,
-            &Hash160::from_data(&bitcoin_publickey.to_bytes()).0,
-        ));
     }
 
     let mut expected_burn_total: u64 = 0;
@@ -732,7 +721,6 @@ fn test_burn_snapshot_sequence() {
     let mut db = SortitionDB::connect_test(first_block_height, &first_burn_hash).unwrap();
     let mut prev_snapshot =
         BlockSnapshot::initial(first_block_height, &first_burn_hash, first_block_height);
-    let mut all_stacks_block_hashes = vec![];
 
     for i in 0..32 {
         let mut block_ops = vec![];
@@ -823,7 +811,6 @@ fn test_burn_snapshot_sequence() {
                 burn_header_hash: burn_block_hash.clone(),
             };
 
-            all_stacks_block_hashes.push(next_block_commit.block_header_hash.clone());
             block_ops.push(BlockstackOperationType::LeaderBlockCommit(
                 next_block_commit,
             ));

stackslib/src/burnchains/tests/db.rs

@@ -919,8 +919,6 @@ fn test_update_block_descendancy_with_fork() {
     let mut cmts_genesis = vec![];
     let mut cmts_invalid = vec![];
 
-    let mut fork_parent = None;
-    let mut fork_parent_block_header: Option<BurnchainBlockHeader> = None;
     let mut fork_cmts = vec![];
 
     for i in 0..5 {
@@ -954,7 +952,6 @@ fn test_update_block_descendancy_with_fork() {
         };
 
         fork_headers.push(block_header.clone());
-        fork_parent_block_header = Some(block_header);
     }
 
     let mut am_id = 0;
@@ -1018,7 +1015,6 @@ fn test_update_block_descendancy_with_fork() {
         fork_cmts.push(fork_cmt.clone());
 
         parent = Some(cmt);
-        fork_parent = Some(fork_cmt);
 
         if i == 0 {
             am_id = {

stackslib/src/chainstate/coordinator/tests.rs

@@ -2263,7 +2263,6 @@ fn test_sortition_with_reward_set() {
     let mut started_first_reward_cycle = false;
     // process sequential blocks, and their sortitions...
     let mut stacks_blocks: Vec<(SortitionId, StacksBlock)> = vec![];
-    let mut anchor_blocks = vec![];
 
     // split up the vrf keys and committers so that we have some that will be mining "correctly"
     //   and some that will be producing bad outputs
@@ -2437,10 +2436,6 @@ fn test_sortition_with_reward_set() {
         let new_burnchain_tip = burnchain.get_canonical_chain_tip().unwrap();
         if b.is_reward_cycle_start(new_burnchain_tip.block_height) {
             started_first_reward_cycle = true;
-            // store the anchor block for this sortition for later checking
-            let ic = sort_db.index_handle_at_tip();
-            let bhh = ic.get_last_anchor_block_hash().unwrap().unwrap();
-            anchor_blocks.push(bhh);
         }
 
         let tip = SortitionDB::get_canonical_burn_chain_tip(sort_db.conn()).unwrap();
@@ -2535,7 +2530,6 @@ fn test_sortition_with_burner_reward_set() {
     let mut started_first_reward_cycle = false;
     // process sequential blocks, and their sortitions...
     let mut stacks_blocks: Vec<(SortitionId, StacksBlock)> = vec![];
-    let mut anchor_blocks = vec![];
 
     // split up the vrf keys and committers so that we have some that will be mining "correctly"
     //   and some that will be producing bad outputs
@@ -2683,10 +2677,6 @@ fn test_sortition_with_burner_reward_set() {
         let new_burnchain_tip = burnchain.get_canonical_chain_tip().unwrap();
         if b.is_reward_cycle_start(new_burnchain_tip.block_height) {
             started_first_reward_cycle = true;
-            // store the anchor block for this sortition for later checking
-            let ic = sort_db.index_handle_at_tip();
-            let bhh = ic.get_last_anchor_block_hash().unwrap().unwrap();
-            anchor_blocks.push(bhh);
         }
 
         let tip = SortitionDB::get_canonical_burn_chain_tip(sort_db.conn()).unwrap();
@@ -2799,7 +2789,6 @@ fn test_pox_btc_ops() {
     let mut started_first_reward_cycle = false;
     // process sequential blocks, and their sortitions...
     let mut stacks_blocks: Vec<(SortitionId, StacksBlock)> = vec![];
-    let mut anchor_blocks = vec![];
 
     // track the reward set consumption
     let mut reward_cycle_count = 0;
@@ -2967,10 +2956,6 @@ fn test_pox_btc_ops() {
         if b.is_reward_cycle_start(new_burnchain_tip.block_height) {
             if new_burnchain_tip.block_height < sunset_ht {
                 started_first_reward_cycle = true;
-                // store the anchor block for this sortition for later checking
-                let ic = sort_db.index_handle_at_tip();
-                let bhh = ic.get_last_anchor_block_hash().unwrap().unwrap();
-                anchor_blocks.push(bhh);
             } else {
                 // store the anchor block for this sortition for later checking
                 let ic = sort_db.index_handle_at_tip();
@@ -3091,7 +3076,6 @@ fn test_stx_transfer_btc_ops() {
     let mut started_first_reward_cycle = false;
     // process sequential blocks, and their sortitions...
     let mut stacks_blocks: Vec<(SortitionId, StacksBlock)> = vec![];
-    let mut anchor_blocks = vec![];
 
     // track the reward set consumption
     let mut reward_recipients = HashSet::new();
@@ -3314,10 +3298,6 @@ fn test_stx_transfer_btc_ops() {
         if b.is_reward_cycle_start(new_burnchain_tip.block_height) {
             if new_burnchain_tip.block_height < sunset_ht {
                 started_first_reward_cycle = true;
-                // store the anchor block for this sortition for later checking
-                let ic = sort_db.index_handle_at_tip();
-                let bhh = ic.get_last_anchor_block_hash().unwrap().unwrap();
-                anchor_blocks.push(bhh);
             } else {
                 // store the anchor block for this sortition for later checking
                 let ic = sort_db.index_handle_at_tip();
@@ -5298,7 +5278,6 @@ fn test_sortition_with_sunset() {
     let mut started_first_reward_cycle = false;
     // process sequential blocks, and their sortitions...
     let mut stacks_blocks: Vec<(SortitionId, StacksBlock)> = vec![];
-    let mut anchor_blocks = vec![];
 
     // split up the vrf keys and committers so that we have some that will be mining "correctly"
     //   and some that will be producing bad outputs
@@ -5482,10 +5461,6 @@ fn test_sortition_with_sunset() {
         if b.is_reward_cycle_start(new_burnchain_tip.block_height) {
             if new_burnchain_tip.block_height < sunset_ht {
                 started_first_reward_cycle = true;
-                // store the anchor block for this sortition for later checking
-                let ic = sort_db.index_handle_at_tip();
-                let bhh = ic.get_last_anchor_block_hash().unwrap().unwrap();
-                anchor_blocks.push(bhh);
             } else {
                 // store the anchor block for this sortition for later checking
                 let ic = sort_db.index_handle_at_tip();
@@ -5611,7 +5586,6 @@ fn test_sortition_with_sunset_and_epoch_switch() {
     let mut started_first_reward_cycle = false;
     // process sequential blocks, and their sortitions...
     let mut stacks_blocks: Vec<(SortitionId, StacksBlock)> = vec![];
-    let mut anchor_blocks = vec![];
 
     // split up the vrf keys and committers so that we have some that will be mining "correctly"
     //   and some that will be producing bad outputs
@@ -5823,10 +5797,6 @@ fn test_sortition_with_sunset_and_epoch_switch() {
         if b.is_reward_cycle_start(new_burnchain_tip.block_height) {
             if new_burnchain_tip.block_height < sunset_ht {
                 started_first_reward_cycle = true;
-                // store the anchor block for this sortition for later checking
-                let ic = sort_db.index_handle_at_tip();
-                let bhh = ic.get_last_anchor_block_hash().unwrap().unwrap();
-                anchor_blocks.push(bhh);
             } else {
                 // store the anchor block for this sortition for later checking
                 let ic = sort_db.index_handle_at_tip();
@@ -6474,7 +6444,6 @@ fn test_pox_fork_out_of_order() {
     let mut sortition_ids_diverged = false;
     // process sequential blocks, and their sortitions...
     let mut stacks_blocks: Vec<(SortitionId, StacksBlock)> = vec![];
-    let mut anchor_blocks = vec![];
 
     // setup:
     //  2 forks: 0 - 1 - 2 - 3 - 4 - 5 - 11 - 12 - 13 - 14 - 15
@@ -6555,8 +6524,6 @@ fn test_pox_fork_out_of_order() {
                 .unwrap()
                 .block_height
             );
-
-            anchor_blocks.push(bhh);
         }
 
         let tip = SortitionDB::get_canonical_burn_chain_tip(sort_db.conn()).unwrap();

stackslib/src/chainstate/nakamoto/coordinator/tests.rs

@@ -112,6 +112,8 @@ fn advance_to_nakamoto(
     let default_pox_addr =
         PoxAddress::from_legacy(AddressHashMode::SerializeP2PKH, addr.bytes.clone());
 
+    // Stores the result of a function with side effects, so have Clippy ignore it
+    #[allow(clippy::collection_is_never_read)]
     let mut tip = None;
     for sortition_height in 0..11 {
         // stack to pox-3 in cycle 7
@@ -347,9 +349,6 @@ fn replay_reward_cycle(
         .step_by(reward_cycle_length)
         .collect();
 
-    let mut indexes: Vec<_> = (0..stacks_blocks.len()).collect();
-    indexes.shuffle(&mut thread_rng());
-
     for burn_ops in burn_ops.iter() {
         let (_, _, consensus_hash) = peer.next_burnchain_block(burn_ops.clone());
     }
@@ -845,7 +844,6 @@ fn block_descendant() {
     boot_plan.pox_constants = pox_constants;
 
     let mut peer = boot_plan.boot_into_nakamoto_peer(vec![], None);
-    let mut blocks = vec![];
     let pox_constants = peer.sortdb().pox_constants.clone();
     let first_burn_height = peer.sortdb().first_block_height;
 
@@ -854,7 +852,6 @@ fn block_descendant() {
     loop {
         let (block, burn_height, ..) =
             peer.single_block_tenure(&private_key, |_| {}, |_| {}, |_| true);
-        blocks.push(block);
 
         if pox_constants.is_in_prepare_phase(first_burn_height, burn_height + 1) {
             info!("At prepare phase start"; "burn_height" => burn_height);
@@ -3206,9 +3203,6 @@ fn test_stacks_on_burnchain_ops() {
     );
 
     let mut all_blocks: Vec<NakamotoBlock> = vec![];
-    let mut all_burn_ops = vec![];
-    let mut consensus_hashes = vec![];
-    let mut fee_counts = vec![];
     let stx_miner_key = peer.miner.nakamoto_miner_key();
 
     let mut extra_burn_ops = vec![];
@@ -3406,8 +3400,6 @@ fn test_stacks_on_burnchain_ops() {
             })
             .sum::<u128>();
 
-        consensus_hashes.push(consensus_hash);
-        fee_counts.push(fees);
         let mut blocks: Vec<NakamotoBlock> = blocks_and_sizes
             .into_iter()
             .map(|(block, _, _)| block)
@@ -3449,7 +3441,6 @@ fn test_stacks_on_burnchain_ops() {
         );
 
         all_blocks.append(&mut blocks);
-        all_burn_ops.push(burn_ops);
     }
 
     // check receipts for burn ops

stackslib/src/chainstate/nakamoto/tests/mod.rs

@@ -2529,8 +2529,6 @@ fn parse_vote_for_aggregate_public_key_invalid() {
     };
     invalid_function_arg_reward_cycle.set_origin_nonce(1);
 
-    let mut account_nonces = std::collections::HashMap::new();
-    account_nonces.insert(invalid_contract_name.origin_address(), 1);
     for (i, tx) in vec![
         invalid_contract_address,
         invalid_contract_name,

stackslib/src/chainstate/stacks/block.rs

@@ -1146,19 +1146,6 @@ mod test {
             StacksEpochId::latest(),
         );
 
-        // remove all coinbases
-        let mut txs_anchored = vec![];
-
-        for tx in all_txs.iter() {
-            match tx.payload {
-                TransactionPayload::Coinbase(..) => {
-                    continue;
-                }
-                _ => {}
-            }
-            txs_anchored.push(tx);
-        }
-
         // make microblocks with 3 transactions each (or fewer)
         for i in 0..(all_txs.len() / 3) {
             let txs = vec![

stackslib/src/chainstate/stacks/boot/pox_4_tests.rs

@@ -928,6 +928,8 @@ fn pox_lock_unlock() {
 
     assert_eq!(burnchain.pox_constants.reward_slots(), 6);
     let mut coinbase_nonce = 0;
+    // Stores the result of a function with side effects, so have Clippy ignore it
+    #[allow(clippy::collection_is_never_read)]
     let mut latest_block = None;
 
     // Advance into pox4
@@ -2685,6 +2687,8 @@ fn pox_4_delegate_stack_increase_events() {
 
     assert_eq!(burnchain.pox_constants.reward_slots(), 6);
     let mut coinbase_nonce = 0;
+    // Stores the result of a function with side effects, so have Clippy ignore it
+    #[allow(clippy::collection_is_never_read)]
     let mut latest_block = None;
 
     let alice_key = keys.pop().unwrap();

stackslib/src/chainstate/stacks/db/transactions.rs

@@ -72,8 +72,9 @@ impl TryFrom<Value> for HashableClarityValue {
 
 impl std::hash::Hash for HashableClarityValue {
     fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
-        #[allow(clippy::unwrap_used)]
+        #[allow(clippy::unwrap_used, clippy::collection_is_never_read)]
         // this unwrap is safe _as long as_ TryFrom<Value> was used as a constructor
+        // Also, this function has side effects, which cause Clippy to wrongly think `bytes` is unused
         let bytes = self.0.serialize_to_vec().unwrap();
         bytes.hash(state);
     }

stackslib/src/chainstate/stacks/index/test/trie.rs

@@ -1232,8 +1232,6 @@ fn trie_cursor_splice_leaf_4() {
             let (nodes, node_ptrs, hashes) =
                 make_node_path(&mut f, node_id.to_u8(), &path_segments, [31u8; 40].to_vec());
 
-            let mut ptrs = vec![];
-
             // splice in a node in each path segment
             for k in 0..5 {
                 let mut path = vec![
@@ -1261,7 +1259,6 @@ fn trie_cursor_splice_leaf_4() {
                     &mut node,
                 )
                 .unwrap();
-                ptrs.push(new_ptr);
 
                 Trie::update_root_hash(&mut f, &c).unwrap();
 
@@ -1325,7 +1322,6 @@ fn trie_cursor_splice_leaf_2() {
 
             let (nodes, node_ptrs, hashes) =
                 make_node_path(&mut f, node_id.to_u8(), &path_segments, [31u8; 40].to_vec());
-            let mut ptrs = vec![];
 
             // splice in a node in each path segment
             for k in 0..10 {
@@ -1350,7 +1346,6 @@ fn trie_cursor_splice_leaf_2() {
                     &mut node,
                 )
                 .unwrap();
-                ptrs.push(new_ptr);
 
                 Trie::update_root_hash(&mut f, &c).unwrap();