[INFO] cloning repository https://github.com/jbarthelmess/practice_collections
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jbarthelmess/practice_collections" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjbarthelmess%2Fpractice_collections", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjbarthelmess%2Fpractice_collections'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fde3a52dfc24effa0cb997dc4d608b6d95c7f849
[INFO] testing jbarthelmess/practice_collections against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjbarthelmess%2Fpractice_collections" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jbarthelmess/practice_collections on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jbarthelmess/practice_collections
[INFO] finished tweaking git repo https://github.com/jbarthelmess/practice_collections
[INFO] tweaked toml for git repo https://github.com/jbarthelmess/practice_collections written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/jbarthelmess/practice_collections already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a646ee48b6ebed60bc2518955ee2722dcd1ec9f70b2555f6450fe951ab1cf31b
[INFO] running `Command { std: "docker" "start" "-a" "a646ee48b6ebed60bc2518955ee2722dcd1ec9f70b2555f6450fe951ab1cf31b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a646ee48b6ebed60bc2518955ee2722dcd1ec9f70b2555f6450fe951ab1cf31b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a646ee48b6ebed60bc2518955ee2722dcd1ec9f70b2555f6450fe951ab1cf31b", kill_on_drop: false }`
[INFO] [stdout] a646ee48b6ebed60bc2518955ee2722dcd1ec9f70b2555f6450fe951ab1cf31b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5ef67826a95afe5f9692853f3c85ce97e93b48f51814ce62a23e7ca0a40dafa0
[INFO] running `Command { std: "docker" "start" "-a" "5ef67826a95afe5f9692853f3c85ce97e93b48f51814ce62a23e7ca0a40dafa0", kill_on_drop: false }`
[INFO] [stderr]    Compiling practice_collections v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `balance`
[INFO] [stdout]  --> src/binary_tree.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     balance: i8
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/binary_tree.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn new(item: T) -> Node<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print`
[INFO] [stdout]   --> src/binary_tree.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn print(&self, indent: &str) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `tree`
[INFO] [stdout]   --> src/binary_tree.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     tree: &'a BinaryTree<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/binary_tree.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn new(tree: &'a BinaryTree<T>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rotate_right`
[INFO] [stdout]   --> src/binary_tree.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn rotate_right<T>(mut root: Box<Node<T>>) -> Box<Node<T>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rotate_left`
[INFO] [stdout]   --> src/binary_tree.rs:83:4
[INFO] [stdout]    |
[INFO] [stdout] 83 | fn rotate_left<T>(mut root: Box<Node<T>>) -> Box<Node<T>> {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `perform_rotation`
[INFO] [stdout]    --> src/binary_tree.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn perform_rotation<T>(mut root: Box<Node<T>>) -> Box<Node<T>> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_helper`
[INFO] [stdout]    --> src/binary_tree.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn add_helper<T: PartialEq + PartialOrd + fmt::Display>(mut parent: Box<Node<T>>, data: T) -> (Box<Node<T>>, i8) {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `search`
[INFO] [stdout]    --> src/binary_tree.rs:174:4
[INFO] [stdout]     |
[INFO] [stdout] 174 | fn search<T: PartialEq + PartialOrd>(node: &Box<Node<T>>, needle: &T) -> bool {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_least`
[INFO] [stdout]    --> src/binary_tree.rs:192:4
[INFO] [stdout]     |
[INFO] [stdout] 192 | fn find_least<T: Clone>(root: &Box<Node<T>>) -> T {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_greatest`
[INFO] [stdout]    --> src/binary_tree.rs:200:4
[INFO] [stdout]     |
[INFO] [stdout] 200 | fn find_greatest<T: Clone>(root: &Box<Node<T>>) -> T {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `remove_helper`
[INFO] [stdout]    --> src/binary_tree.rs:208:4
[INFO] [stdout]     |
[INFO] [stdout] 208 | fn remove_helper<T: PartialEq + PartialOrd + fmt::Display + Clone>(mut parent: Box<Node<T>>, data: &T) -> (Option<Box<Node<T>>>, i8) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `head`
[INFO] [stdout]    --> src/binary_tree.rs:306:5
[INFO] [stdout]     |
[INFO] [stdout] 306 |     head: Option<Box<Node<T>>>
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/binary_tree.rs:310:12
[INFO] [stdout]     |
[INFO] [stdout] 310 |     pub fn new() -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add`
[INFO] [stdout]    --> src/binary_tree.rs:316:12
[INFO] [stdout]     |
[INFO] [stdout] 316 |     pub fn add(&mut self, item: T) {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove`
[INFO] [stdout]    --> src/binary_tree.rs:323:12
[INFO] [stdout]     |
[INFO] [stdout] 323 |     pub fn remove(&mut self, item: T) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `contains`
[INFO] [stdout]    --> src/binary_tree.rs:329:12
[INFO] [stdout]     |
[INFO] [stdout] 329 |     pub fn contains(&mut self, needle: &T) -> bool {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]    --> src/binary_tree.rs:337:12
[INFO] [stdout]     |
[INFO] [stdout] 337 |     pub fn iter(&self) -> TreeIterator<T> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print`
[INFO] [stdout]    --> src/binary_tree.rs:341:12
[INFO] [stdout]     |
[INFO] [stdout] 341 |     pub fn print(&self) {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.26s
[INFO] running `Command { std: "docker" "inspect" "5ef67826a95afe5f9692853f3c85ce97e93b48f51814ce62a23e7ca0a40dafa0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ef67826a95afe5f9692853f3c85ce97e93b48f51814ce62a23e7ca0a40dafa0", kill_on_drop: false }`
[INFO] [stdout] 5ef67826a95afe5f9692853f3c85ce97e93b48f51814ce62a23e7ca0a40dafa0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e9696d100dff65995c0c4c5b27220c951fcd76a8b5877cdfa64f3913bb8f2577
[INFO] running `Command { std: "docker" "start" "-a" "e9696d100dff65995c0c4c5b27220c951fcd76a8b5877cdfa64f3913bb8f2577", kill_on_drop: false }`
[INFO] [stdout] warning: field is never read: `balance`
[INFO] [stdout]  --> src/binary_tree.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     balance: i8
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/binary_tree.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn new(item: T) -> Node<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print`
[INFO] [stdout]   --> src/binary_tree.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn print(&self, indent: &str) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `tree`
[INFO] [stdout]   --> src/binary_tree.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     tree: &'a BinaryTree<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/binary_tree.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn new(tree: &'a BinaryTree<T>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rotate_right`
[INFO] [stdout]   --> src/binary_tree.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn rotate_right<T>(mut root: Box<Node<T>>) -> Box<Node<T>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rotate_left`
[INFO] [stdout]   --> src/binary_tree.rs:83:4
[INFO] [stdout]    |
[INFO] [stdout] 83 | fn rotate_left<T>(mut root: Box<Node<T>>) -> Box<Node<T>> {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `perform_rotation`
[INFO] [stdout]    --> src/binary_tree.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn perform_rotation<T>(mut root: Box<Node<T>>) -> Box<Node<T>> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_helper`
[INFO] [stdout]    --> src/binary_tree.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn add_helper<T: PartialEq + PartialOrd + fmt::Display>(mut parent: Box<Node<T>>, data: T) -> (Box<Node<T>>, i8) {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `search`
[INFO] [stdout]    --> src/binary_tree.rs:174:4
[INFO] [stdout]     |
[INFO] [stdout] 174 | fn search<T: PartialEq + PartialOrd>(node: &Box<Node<T>>, needle: &T) -> bool {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_least`
[INFO] [stdout]    --> src/binary_tree.rs:192:4
[INFO] [stdout]     |
[INFO] [stdout] 192 | fn find_least<T: Clone>(root: &Box<Node<T>>) -> T {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_greatest`
[INFO] [stdout]    --> src/binary_tree.rs:200:4
[INFO] [stdout]     |
[INFO] [stdout] 200 | fn find_greatest<T: Clone>(root: &Box<Node<T>>) -> T {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `remove_helper`
[INFO] [stdout]    --> src/binary_tree.rs:208:4
[INFO] [stdout]     |
[INFO] [stdout] 208 | fn remove_helper<T: PartialEq + PartialOrd + fmt::Display + Clone>(mut parent: Box<Node<T>>, data: &T) -> (Option<Box<Node<T>>>, i8) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `head`
[INFO] [stdout]    --> src/binary_tree.rs:306:5
[INFO] [stdout]     |
[INFO] [stdout] 306 |     head: Option<Box<Node<T>>>
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/binary_tree.rs:310:12
[INFO] [stdout]     |
[INFO] [stdout] 310 |     pub fn new() -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add`
[INFO] [stdout]    --> src/binary_tree.rs:316:12
[INFO] [stdout]     |
[INFO] [stdout] 316 |     pub fn add(&mut self, item: T) {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove`
[INFO] [stdout]    --> src/binary_tree.rs:323:12
[INFO] [stdout]     |
[INFO] [stdout] 323 |     pub fn remove(&mut self, item: T) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling practice_collections v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `contains`
[INFO] [stdout]    --> src/binary_tree.rs:329:12
[INFO] [stdout]     |
[INFO] [stdout] 329 |     pub fn contains(&mut self, needle: &T) -> bool {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]    --> src/binary_tree.rs:337:12
[INFO] [stdout]     |
[INFO] [stdout] 337 |     pub fn iter(&self) -> TreeIterator<T> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print`
[INFO] [stdout]    --> src/binary_tree.rs:341:12
[INFO] [stdout]     |
[INFO] [stdout] 341 |     pub fn print(&self) {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `tree`
[INFO] [stdout]   --> src/binary_tree.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     tree: &'a BinaryTree<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `Command { std: "docker" "inspect" "e9696d100dff65995c0c4c5b27220c951fcd76a8b5877cdfa64f3913bb8f2577", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9696d100dff65995c0c4c5b27220c951fcd76a8b5877cdfa64f3913bb8f2577", kill_on_drop: false }`
[INFO] [stdout] e9696d100dff65995c0c4c5b27220c951fcd76a8b5877cdfa64f3913bb8f2577
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d768a4b5b7df8d5a5198d4cc8d5316dd216b41a93556fdce24661a5ed0ab3f16
[INFO] running `Command { std: "docker" "start" "-a" "d768a4b5b7df8d5a5198d4cc8d5316dd216b41a93556fdce24661a5ed0ab3f16", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: field is never read: `balance`
[INFO] [stderr]  --> src/binary_tree.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     balance: i8
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/binary_tree.rs:11:8
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fn new(item: T) -> Node<T> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `print`
[INFO] [stderr]   --> src/binary_tree.rs:20:8
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn print(&self, indent: &str) {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `tree`
[INFO] [stderr]   --> src/binary_tree.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     tree: &'a BinaryTree<T>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/binary_tree.rs:39:8
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn new(tree: &'a BinaryTree<T>) -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `rotate_right`
[INFO] [stderr]   --> src/binary_tree.rs:67:4
[INFO] [stderr]    |
[INFO] [stderr] 67 | fn rotate_right<T>(mut root: Box<Node<T>>) -> Box<Node<T>> {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `rotate_left`
[INFO] [stderr]   --> src/binary_tree.rs:83:4
[INFO] [stderr]    |
[INFO] [stderr] 83 | fn rotate_left<T>(mut root: Box<Node<T>>) -> Box<Node<T>> {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `perform_rotation`
[INFO] [stderr]    --> src/binary_tree.rs:100:4
[INFO] [stderr]     |
[INFO] [stderr] 100 | fn perform_rotation<T>(mut root: Box<Node<T>>) -> Box<Node<T>> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_helper`
[INFO] [stderr]    --> src/binary_tree.rs:128:4
[INFO] [stderr]     |
[INFO] [stderr] 128 | fn add_helper<T: PartialEq + PartialOrd + fmt::Display>(mut parent: Box<Node<T>>, data: T) -> (Box<Node<T>>, i8) {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `search`
[INFO] [stderr]    --> src/binary_tree.rs:174:4
[INFO] [stderr]     |
[INFO] [stderr] 174 | fn search<T: PartialEq + PartialOrd>(node: &Box<Node<T>>, needle: &T) -> bool {
[INFO] [stderr]     |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `find_least`
[INFO] [stderr]    --> src/binary_tree.rs:192:4
[INFO] [stderr]     |
[INFO] [stderr] 192 | fn find_least<T: Clone>(root: &Box<Node<T>>) -> T {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `find_greatest`
[INFO] [stderr]    --> src/binary_tree.rs:200:4
[INFO] [stderr]     |
[INFO] [stderr] 200 | fn find_greatest<T: Clone>(root: &Box<Node<T>>) -> T {
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `remove_helper`
[INFO] [stderr]    --> src/binary_tree.rs:208:4
[INFO] [stderr]     |
[INFO] [stderr] 208 | fn remove_helper<T: PartialEq + PartialOrd + fmt::Display + Clone>(mut parent: Box<Node<T>>, data: &T) -> (Option<Box<Node<T>>>, i8) {
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `head`
[INFO] [stderr]    --> src/binary_tree.rs:306:5
[INFO] [stderr]     |
[INFO] [stderr] 306 |     head: Option<Box<Node<T>>>
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/binary_tree.rs:310:12
[INFO] [stderr]     |
[INFO] [stderr] 310 |     pub fn new() -> Self {
[INFO] [stderr]     |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `add`
[INFO] [stderr]    --> src/binary_tree.rs:316:12
[INFO] [stderr]     |
[INFO] [stderr] 316 |     pub fn add(&mut self, item: T) {
[INFO] [stderr]     |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `remove`
[INFO] [stderr]    --> src/binary_tree.rs:323:12
[INFO] [stderr]     |
[INFO] [stderr] 323 |     pub fn remove(&mut self, item: T) {
[INFO] [stderr]     |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `contains`
[INFO] [stderr]    --> src/binary_tree.rs:329:12
[INFO] [stderr]     |
[INFO] [stderr] 329 |     pub fn contains(&mut self, needle: &T) -> bool {
[INFO] [stderr]     |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `iter`
[INFO] [stderr]    --> src/binary_tree.rs:337:12
[INFO] [stderr]     |
[INFO] [stderr] 337 |     pub fn iter(&self) -> TreeIterator<T> {
[INFO] [stderr]     |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `print`
[INFO] [stderr]    --> src/binary_tree.rs:341:12
[INFO] [stderr]     |
[INFO] [stderr] 341 |     pub fn print(&self) {
[INFO] [stderr]     |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `practice_collections` (lib) generated 20 warnings
[INFO] [stderr] warning: field is never read: `tree`
[INFO] [stderr]   --> src/binary_tree.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     tree: &'a BinaryTree<T>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `practice_collections` (lib test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.42s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/practice_collections-0680b9b6279c1d21)
[INFO] [stdout] 
[INFO] [stdout] running 16 tests
[INFO] [stdout] test binary_tree::tests::first_test ... ok
[INFO] [stdout] test binary_tree::tests::iterator ... ok
[INFO] [stdout] test binary_tree::tests::remove ... ok
[INFO] [stdout] test binary_tree::tests::search_test ... ok
[INFO] [stdout] test binary_tree::tests::second_test ... ok
[INFO] [stdout] test stack::tests::test_depth_empty ... ok
[INFO] [stdout] test stack::tests::test_depth_many ... ok
[INFO] [stdout] test stack::tests::test_depth_one ... ok
[INFO] [stdout] test stack::tests::test_is_empty_false ... ok
[INFO] [stdout] test stack::tests::test_is_empty_true ... ok
[INFO] [stdout] test stack::tests::test_peek_empty ... ok
[INFO] [stdout] test stack::tests::test_peek_items ... ok
[INFO] [stdout] test stack::tests::test_pop_empty ... ok
[INFO] [stdout] test stack::tests::test_pop_multiple_items ... ok
[INFO] [stdout] test stack::tests::test_pop_one_item ... ok
[INFO] [stdout] test stack::tests::test_push_no_panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests practice_collections
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d768a4b5b7df8d5a5198d4cc8d5316dd216b41a93556fdce24661a5ed0ab3f16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d768a4b5b7df8d5a5198d4cc8d5316dd216b41a93556fdce24661a5ed0ab3f16", kill_on_drop: false }`
[INFO] [stdout] d768a4b5b7df8d5a5198d4cc8d5316dd216b41a93556fdce24661a5ed0ab3f16