[INFO] cloning repository https://github.com/kzbt/kzdb
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kzbt/kzdb" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkzbt%2Fkzdb", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkzbt%2Fkzdb'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] db621549346591ad9974938dc517ec913d4350ec
[INFO] checking kzbt/kzdb against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkzbt%2Fkzdb" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kzbt/kzdb on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kzbt/kzdb
[INFO] finished tweaking git repo https://github.com/kzbt/kzdb
[INFO] tweaked toml for git repo https://github.com/kzbt/kzdb written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kzbt/kzdb already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5b9a6580a3f9fc6f4026f549dd233c6335c15e8759a711bba073113e696467ca
[INFO] running `Command { std: "docker" "start" "-a" "5b9a6580a3f9fc6f4026f549dd233c6335c15e8759a711bba073113e696467ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b9a6580a3f9fc6f4026f549dd233c6335c15e8759a711bba073113e696467ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b9a6580a3f9fc6f4026f549dd233c6335c15e8759a711bba073113e696467ca", kill_on_drop: false }`
[INFO] [stdout] 5b9a6580a3f9fc6f4026f549dd233c6335c15e8759a711bba073113e696467ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6018b2f57cd8f4839911a4f1d2a7a9600c287ea16d76abc7c7adc392da736f5c
[INFO] running `Command { std: "docker" "start" "-a" "6018b2f57cd8f4839911a4f1d2a7a9600c287ea16d76abc7c7adc392da736f5c", kill_on_drop: false }`
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]    Compiling crossbeam-utils v0.8.7
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]    Compiling libc v0.2.119
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking once_cell v1.10.0
[INFO] [stderr]    Compiling anyhow v1.0.56
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking predicates-core v1.0.3
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]     Checking termtree v0.2.4
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking fastrand v1.7.0
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking predicates-tree v1.0.5
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]     Checking thread_local v1.1.4
[INFO] [stderr]     Checking kzdb v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `keys`
[INFO] [stdout]   --> src/btree/btree.rs:49:25
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |                         ^^^^ help: if this is intentional, prefix it with an underscore: `_keys`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `values`
[INFO] [stdout]   --> src/btree/btree.rs:49:40
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_values`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keys`
[INFO] [stdout]    --> src/btree/node.rs:120:27
[INFO] [stdout]     |
[INFO] [stdout] 120 |             Node::Inner { keys, nodes } => (key, Node::leaf(), Node::leaf()),
[INFO] [stdout]     |                           ^^^^ help: try ignoring the field: `keys: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nodes`
[INFO] [stdout]    --> src/btree/node.rs:120:33
[INFO] [stdout]     |
[INFO] [stdout] 120 |             Node::Inner { keys, nodes } => (key, Node::leaf(), Node::leaf()),
[INFO] [stdout]     |                                 ^^^^^ help: try ignoring the field: `nodes: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dm`
[INFO] [stdout]   --> src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let dm = DiskManager::new(db_path);
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_dm`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Searchable` is never used
[INFO] [stdout]  --> src/btree/mod.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | trait Searchable<T> {
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `TREE_ORDER` is never used
[INFO] [stdout]  --> src/btree/btree.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub const TREE_ORDER: usize = 16;
[INFO] [stdout]   |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Btree` is never constructed
[INFO] [stdout]  --> src/btree/btree.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Btree<K, V> {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Btree` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `with_capacity`, `is_empty`, `insert`, and `split` are never used
[INFO] [stdout]   --> src/btree/btree.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | / impl<K, V> Btree<K, V>
[INFO] [stdout] 12 | | where
[INFO] [stdout] 13 | |     K: Copy + PartialEq + PartialOrd + std::fmt::Debug,
[INFO] [stdout] 14 | |     V: Clone + std::fmt::Debug,
[INFO] [stdout]    | |_______________________________- associated items in this implementation
[INFO] [stdout] 15 |   {
[INFO] [stdout] 16 |       pub fn new() -> Self {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |       pub fn with_capacity(capacity: usize) -> Self {
[INFO] [stdout]    |              ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |       fn is_empty(&self) -> bool {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 34 |       fn insert(&mut self, key: K, value: V) {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |       fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `NODE_CAPACITY` is never used
[INFO] [stdout]  --> src/btree/node.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | const NODE_CAPACITY: usize = TREE_ORDER - 1;
[INFO] [stdout]   |       ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Kv` is never constructed
[INFO] [stdout]  --> src/btree/node.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Kv<K, V> {
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/btree/node.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl<K, V> Kv<K, V> {
[INFO] [stdout]    | ------------------- associated function in this implementation
[INFO] [stdout] 11 |     pub fn new(key: K, value: V) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Node` is never used
[INFO] [stdout]   --> src/btree/node.rs:17:10
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub enum Node<K, V> {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `SplitNodes` is never used
[INFO] [stdout]   --> src/btree/node.rs:28:6
[INFO] [stdout]    |
[INFO] [stdout] 28 | type SplitNodes<K, V> = (K, Node<K, V>, Node<K, V>);
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `inner`, `leaf`, `leaf_with_cap`, `insert`, `insert_empty_inner`, and `split` are never used
[INFO] [stdout]   --> src/btree/node.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | / impl<K, V> Node<K, V>
[INFO] [stdout] 31 | | where
[INFO] [stdout] 32 | |     K: Copy + PartialOrd + PartialEq + std::fmt::Debug,
[INFO] [stdout] 33 | |     V: Clone,
[INFO] [stdout]    | |_____________- associated items in this implementation
[INFO] [stdout] 34 |   {
[INFO] [stdout] 35 |       pub fn inner() -> Self {
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |       pub fn leaf() -> Self {
[INFO] [stdout]    |              ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |       pub fn leaf_with_cap(capacity: usize) -> Self {
[INFO] [stdout]    |              ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 56 |       pub fn insert(&mut self, key: K, value: V) -> Result<(), SplitNodes<K, V>> {
[INFO] [stdout]    |              ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 86 |       pub fn insert_empty_inner(&mut self, key: K, mut ns: Vec<Node<K, V>>) {
[INFO] [stdout]    |              ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 93 |       fn split(&mut self, idx: usize, key: K, value: V) -> SplitNodes<K, V> {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `PAGE_SIZE` is never used
[INFO] [stdout]  --> src/storage/mod.rs:9:7
[INFO] [stdout]   |
[INFO] [stdout] 9 | const PAGE_SIZE: u32 = 8192;
[INFO] [stdout]   |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Storage` is never used
[INFO] [stdout]   --> src/storage/mod.rs:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub trait Storage {
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BUFFER_POOL_SIZE` is never used
[INFO] [stdout]  --> src/storage/bufferpool.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const BUFFER_POOL_SIZE: usize = 2000;
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BufferPool` is never constructed
[INFO] [stdout]  --> src/storage/bufferpool.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct BufferPool {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/storage/bufferpool.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl BufferPool {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 14 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `file` is never read
[INFO] [stdout]   --> src/storage/disk.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct DiskManager {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] 15 |     file: File,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `read_page` and `write_page` are never used
[INFO] [stdout]   --> src/storage/disk.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl DiskManager {
[INFO] [stdout]    | ---------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 31 |     pub fn read_page(&mut self, pgid: PageId, buf: &mut [u8]) -> Result<()> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     pub fn write_page(&mut self, pgid: PageId, buf: &[u8]) -> Result<()> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ZERO_U32` is never used
[INFO] [stdout]  --> src/storage/page.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const ZERO_U32: [u8; 4] = 0u32.to_be_bytes();
[INFO] [stdout]   |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `HEADER_SIZE` is never used
[INFO] [stdout]  --> src/storage/page.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | const HEADER_SIZE: usize = size_of::<PageHeader>();
[INFO] [stdout]   |       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PageHeader` is never constructed
[INFO] [stdout]  --> src/storage/page.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub struct PageHeader {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `write_to` is never used
[INFO] [stdout]   --> src/storage/page.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl PageHeader {
[INFO] [stdout]    | --------------- method in this implementation
[INFO] [stdout] 17 |     fn write_to(&self, buffer: &mut [u8]) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tuple` is never constructed
[INFO] [stdout]   --> src/storage/page.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct Tuple {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Page` is never constructed
[INFO] [stdout]   --> src/storage/page.rs:42:12
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub struct Page {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `insert_tuple`, and `update_header` are never used
[INFO] [stdout]   --> src/storage/page.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 49 | impl Page {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 50 |     fn new(pgid: PageId, prev_page: Option<PageId>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 67 |     fn insert_tuple(&mut self, tuple: &Tuple) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 78 |     fn update_header(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tempfile v3.3.0
[INFO] [stderr]     Checking predicates v2.1.1
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking globset v0.4.8
[INFO] [stderr]     Checking ignore v0.4.18
[INFO] [stderr]     Checking globwalk v0.8.1
[INFO] [stderr]     Checking assert_fs v1.0.7
[INFO] [stdout] warning: unused variable: `keys`
[INFO] [stdout]   --> src/btree/btree.rs:49:25
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |                         ^^^^ help: if this is intentional, prefix it with an underscore: `_keys`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `values`
[INFO] [stdout]   --> src/btree/btree.rs:49:40
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_values`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keys`
[INFO] [stdout]    --> src/btree/node.rs:120:27
[INFO] [stdout]     |
[INFO] [stdout] 120 |             Node::Inner { keys, nodes } => (key, Node::leaf(), Node::leaf()),
[INFO] [stdout]     |                           ^^^^ help: try ignoring the field: `keys: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nodes`
[INFO] [stdout]    --> src/btree/node.rs:120:33
[INFO] [stdout]     |
[INFO] [stdout] 120 |             Node::Inner { keys, nodes } => (key, Node::leaf(), Node::leaf()),
[INFO] [stdout]     |                                 ^^^^^ help: try ignoring the field: `nodes: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dm`
[INFO] [stdout]   --> src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let dm = DiskManager::new(db_path);
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_dm`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `is_empty`, and `split` are never used
[INFO] [stdout]   --> src/btree/btree.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | / impl<K, V> Btree<K, V>
[INFO] [stdout] 12 | | where
[INFO] [stdout] 13 | |     K: Copy + PartialEq + PartialOrd + std::fmt::Debug,
[INFO] [stdout] 14 | |     V: Clone + std::fmt::Debug,
[INFO] [stdout]    | |_______________________________- associated items in this implementation
[INFO] [stdout] 15 |   {
[INFO] [stdout] 16 |       pub fn new() -> Self {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |       fn is_empty(&self) -> bool {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |       fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Kv` is never constructed
[INFO] [stdout]  --> src/btree/node.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Kv<K, V> {
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/btree/node.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl<K, V> Kv<K, V> {
[INFO] [stdout]    | ------------------- associated function in this implementation
[INFO] [stdout] 11 |     pub fn new(key: K, value: V) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Storage` is never used
[INFO] [stdout]   --> src/storage/mod.rs:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub trait Storage {
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BUFFER_POOL_SIZE` is never used
[INFO] [stdout]  --> src/storage/bufferpool.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const BUFFER_POOL_SIZE: usize = 2000;
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BufferPool` is never constructed
[INFO] [stdout]  --> src/storage/bufferpool.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct BufferPool {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/storage/bufferpool.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl BufferPool {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 14 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `rid` is never read
[INFO] [stdout]   --> src/storage/page.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct Tuple {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 38 |     rid: RecordId,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `slots` and `dirty` are never read
[INFO] [stdout]   --> src/storage/page.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub struct Page {
[INFO] [stdout]    |            ---- fields in this struct
[INFO] [stdout] 43 |     pub header: PageHeader,
[INFO] [stdout] 44 |     pub slots: Vec<u32>,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 45 |     pub data: Vec<u8>,
[INFO] [stdout] 46 |     pub dirty: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.86s
[INFO] running `Command { std: "docker" "inspect" "6018b2f57cd8f4839911a4f1d2a7a9600c287ea16d76abc7c7adc392da736f5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6018b2f57cd8f4839911a4f1d2a7a9600c287ea16d76abc7c7adc392da736f5c", kill_on_drop: false }`
[INFO] [stdout] 6018b2f57cd8f4839911a4f1d2a7a9600c287ea16d76abc7c7adc392da736f5c
[INFO] checking kzbt/kzdb against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkzbt%2Fkzdb" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kzbt/kzdb on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kzbt/kzdb
[INFO] finished tweaking git repo https://github.com/kzbt/kzdb
[INFO] tweaked toml for git repo https://github.com/kzbt/kzdb written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kzbt/kzdb already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 895f008b15351f10809139cbdb61364a2718e372b45ab41e9c2c5a1fb36e3912
[INFO] running `Command { std: "docker" "start" "-a" "895f008b15351f10809139cbdb61364a2718e372b45ab41e9c2c5a1fb36e3912", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "895f008b15351f10809139cbdb61364a2718e372b45ab41e9c2c5a1fb36e3912", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "895f008b15351f10809139cbdb61364a2718e372b45ab41e9c2c5a1fb36e3912", kill_on_drop: false }`
[INFO] [stdout] 895f008b15351f10809139cbdb61364a2718e372b45ab41e9c2c5a1fb36e3912
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a4a1f45a62d09f34f552cc09abd4185e32db3722dd3ba475393faba2122556c0
[INFO] running `Command { std: "docker" "start" "-a" "a4a1f45a62d09f34f552cc09abd4185e32db3722dd3ba475393faba2122556c0", kill_on_drop: false }`
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling crossbeam-utils v0.8.7
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking once_cell v1.10.0
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]    Compiling libc v0.2.119
[INFO] [stderr]     Checking predicates-core v1.0.3
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]    Compiling anyhow v1.0.56
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]     Checking termtree v0.2.4
[INFO] [stderr]     Checking fastrand v1.7.0
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking predicates-tree v1.0.5
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]     Checking thread_local v1.1.4
[INFO] [stderr]     Checking kzdb v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `keys`
[INFO] [stdout]   --> src/btree/btree.rs:49:25
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |                         ^^^^ help: if this is intentional, prefix it with an underscore: `_keys`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `values`
[INFO] [stdout]   --> src/btree/btree.rs:49:40
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_values`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keys`
[INFO] [stdout]    --> src/btree/node.rs:120:27
[INFO] [stdout]     |
[INFO] [stdout] 120 |             Node::Inner { keys, nodes } => (key, Node::leaf(), Node::leaf()),
[INFO] [stdout]     |                           ^^^^ help: try ignoring the field: `keys: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nodes`
[INFO] [stdout]    --> src/btree/node.rs:120:33
[INFO] [stdout]     |
[INFO] [stdout] 120 |             Node::Inner { keys, nodes } => (key, Node::leaf(), Node::leaf()),
[INFO] [stdout]     |                                 ^^^^^ help: try ignoring the field: `nodes: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dm`
[INFO] [stdout]   --> src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let dm = DiskManager::new(db_path);
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_dm`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Searchable` is never used
[INFO] [stdout]  --> src/btree/mod.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | trait Searchable<T> {
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `TREE_ORDER` is never used
[INFO] [stdout]  --> src/btree/btree.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub const TREE_ORDER: usize = 16;
[INFO] [stdout]   |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Btree` is never constructed
[INFO] [stdout]  --> src/btree/btree.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Btree<K, V> {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Btree` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `with_capacity`, `is_empty`, `insert`, and `split` are never used
[INFO] [stdout]   --> src/btree/btree.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | / impl<K, V> Btree<K, V>
[INFO] [stdout] 12 | | where
[INFO] [stdout] 13 | |     K: Copy + PartialEq + PartialOrd + std::fmt::Debug,
[INFO] [stdout] 14 | |     V: Clone + std::fmt::Debug,
[INFO] [stdout]    | |_______________________________- associated items in this implementation
[INFO] [stdout] 15 |   {
[INFO] [stdout] 16 |       pub fn new() -> Self {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |       pub fn with_capacity(capacity: usize) -> Self {
[INFO] [stdout]    |              ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |       fn is_empty(&self) -> bool {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 34 |       fn insert(&mut self, key: K, value: V) {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |       fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `NODE_CAPACITY` is never used
[INFO] [stdout]  --> src/btree/node.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | const NODE_CAPACITY: usize = TREE_ORDER - 1;
[INFO] [stdout]   |       ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Kv` is never constructed
[INFO] [stdout]  --> src/btree/node.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Kv<K, V> {
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/btree/node.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl<K, V> Kv<K, V> {
[INFO] [stdout]    | ------------------- associated function in this implementation
[INFO] [stdout] 11 |     pub fn new(key: K, value: V) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Node` is never used
[INFO] [stdout]   --> src/btree/node.rs:17:10
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub enum Node<K, V> {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `SplitNodes` is never used
[INFO] [stdout]   --> src/btree/node.rs:28:6
[INFO] [stdout]    |
[INFO] [stdout] 28 | type SplitNodes<K, V> = (K, Node<K, V>, Node<K, V>);
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `inner`, `leaf`, `leaf_with_cap`, `insert`, `insert_empty_inner`, and `split` are never used
[INFO] [stdout]   --> src/btree/node.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | / impl<K, V> Node<K, V>
[INFO] [stdout] 31 | | where
[INFO] [stdout] 32 | |     K: Copy + PartialOrd + PartialEq + std::fmt::Debug,
[INFO] [stdout] 33 | |     V: Clone,
[INFO] [stdout]    | |_____________- associated items in this implementation
[INFO] [stdout] 34 |   {
[INFO] [stdout] 35 |       pub fn inner() -> Self {
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |       pub fn leaf() -> Self {
[INFO] [stdout]    |              ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |       pub fn leaf_with_cap(capacity: usize) -> Self {
[INFO] [stdout]    |              ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 56 |       pub fn insert(&mut self, key: K, value: V) -> Result<(), SplitNodes<K, V>> {
[INFO] [stdout]    |              ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 86 |       pub fn insert_empty_inner(&mut self, key: K, mut ns: Vec<Node<K, V>>) {
[INFO] [stdout]    |              ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 93 |       fn split(&mut self, idx: usize, key: K, value: V) -> SplitNodes<K, V> {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `PAGE_SIZE` is never used
[INFO] [stdout]  --> src/storage/mod.rs:9:7
[INFO] [stdout]   |
[INFO] [stdout] 9 | const PAGE_SIZE: u32 = 8192;
[INFO] [stdout]   |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Storage` is never used
[INFO] [stdout]   --> src/storage/mod.rs:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub trait Storage {
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BUFFER_POOL_SIZE` is never used
[INFO] [stdout]  --> src/storage/bufferpool.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const BUFFER_POOL_SIZE: usize = 2000;
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BufferPool` is never constructed
[INFO] [stdout]  --> src/storage/bufferpool.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct BufferPool {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/storage/bufferpool.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl BufferPool {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 14 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `file` is never read
[INFO] [stdout]   --> src/storage/disk.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct DiskManager {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] 15 |     file: File,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `read_page` and `write_page` are never used
[INFO] [stdout]   --> src/storage/disk.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl DiskManager {
[INFO] [stdout]    | ---------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 31 |     pub fn read_page(&mut self, pgid: PageId, buf: &mut [u8]) -> Result<()> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 38 |     pub fn write_page(&mut self, pgid: PageId, buf: &[u8]) -> Result<()> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ZERO_U32` is never used
[INFO] [stdout]  --> src/storage/page.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const ZERO_U32: [u8; 4] = 0u32.to_be_bytes();
[INFO] [stdout]   |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `HEADER_SIZE` is never used
[INFO] [stdout]  --> src/storage/page.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | const HEADER_SIZE: usize = size_of::<PageHeader>();
[INFO] [stdout]   |       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PageHeader` is never constructed
[INFO] [stdout]  --> src/storage/page.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub struct PageHeader {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `write_to` is never used
[INFO] [stdout]   --> src/storage/page.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl PageHeader {
[INFO] [stdout]    | --------------- method in this implementation
[INFO] [stdout] 17 |     fn write_to(&self, buffer: &mut [u8]) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tuple` is never constructed
[INFO] [stdout]   --> src/storage/page.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct Tuple {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Page` is never constructed
[INFO] [stdout]   --> src/storage/page.rs:42:12
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub struct Page {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `insert_tuple`, and `update_header` are never used
[INFO] [stdout]   --> src/storage/page.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 49 | impl Page {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 50 |     fn new(pgid: PageId, prev_page: Option<PageId>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 67 |     fn insert_tuple(&mut self, tuple: &Tuple) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 78 |     fn update_header(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tempfile v3.3.0
[INFO] [stderr]     Checking predicates v2.1.1
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking globset v0.4.8
[INFO] [stderr]     Checking ignore v0.4.18
[INFO] [stderr]     Checking globwalk v0.8.1
[INFO] [stderr]     Checking assert_fs v1.0.7
[INFO] [stdout] warning: unused variable: `keys`
[INFO] [stdout]   --> src/btree/btree.rs:49:25
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |                         ^^^^ help: if this is intentional, prefix it with an underscore: `_keys`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `values`
[INFO] [stdout]   --> src/btree/btree.rs:49:40
[INFO] [stdout]    |
[INFO] [stdout] 49 |     fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_values`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keys`
[INFO] [stdout]    --> src/btree/node.rs:120:27
[INFO] [stdout]     |
[INFO] [stdout] 120 |             Node::Inner { keys, nodes } => (key, Node::leaf(), Node::leaf()),
[INFO] [stdout]     |                           ^^^^ help: try ignoring the field: `keys: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nodes`
[INFO] [stdout]    --> src/btree/node.rs:120:33
[INFO] [stdout]     |
[INFO] [stdout] 120 |             Node::Inner { keys, nodes } => (key, Node::leaf(), Node::leaf()),
[INFO] [stdout]     |                                 ^^^^^ help: try ignoring the field: `nodes: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dm`
[INFO] [stdout]   --> src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let dm = DiskManager::new(db_path);
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_dm`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `is_empty`, and `split` are never used
[INFO] [stdout]   --> src/btree/btree.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | / impl<K, V> Btree<K, V>
[INFO] [stdout] 12 | | where
[INFO] [stdout] 13 | |     K: Copy + PartialEq + PartialOrd + std::fmt::Debug,
[INFO] [stdout] 14 | |     V: Clone + std::fmt::Debug,
[INFO] [stdout]    | |_______________________________- associated items in this implementation
[INFO] [stdout] 15 |   {
[INFO] [stdout] 16 |       pub fn new() -> Self {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |       fn is_empty(&self) -> bool {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |       fn split(&mut self, keys: &Vec<K>, values: &Vec<V>) {}
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Kv` is never constructed
[INFO] [stdout]  --> src/btree/node.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Kv<K, V> {
[INFO] [stdout]   |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/btree/node.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl<K, V> Kv<K, V> {
[INFO] [stdout]    | ------------------- associated function in this implementation
[INFO] [stdout] 11 |     pub fn new(key: K, value: V) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Storage` is never used
[INFO] [stdout]   --> src/storage/mod.rs:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub trait Storage {
[INFO] [stdout]    |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BUFFER_POOL_SIZE` is never used
[INFO] [stdout]  --> src/storage/bufferpool.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const BUFFER_POOL_SIZE: usize = 2000;
[INFO] [stdout]   |       ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BufferPool` is never constructed
[INFO] [stdout]  --> src/storage/bufferpool.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct BufferPool {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/storage/bufferpool.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl BufferPool {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 14 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `rid` is never read
[INFO] [stdout]   --> src/storage/page.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub struct Tuple {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 38 |     rid: RecordId,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `slots` and `dirty` are never read
[INFO] [stdout]   --> src/storage/page.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub struct Page {
[INFO] [stdout]    |            ---- fields in this struct
[INFO] [stdout] 43 |     pub header: PageHeader,
[INFO] [stdout] 44 |     pub slots: Vec<u32>,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 45 |     pub data: Vec<u8>,
[INFO] [stdout] 46 |     pub dirty: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.00s
[INFO] running `Command { std: "docker" "inspect" "a4a1f45a62d09f34f552cc09abd4185e32db3722dd3ba475393faba2122556c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4a1f45a62d09f34f552cc09abd4185e32db3722dd3ba475393faba2122556c0", kill_on_drop: false }`
[INFO] [stdout] a4a1f45a62d09f34f552cc09abd4185e32db3722dd3ba475393faba2122556c0