[INFO] cloning repository https://github.com/mmmpa/learning_rust_data_structure
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mmmpa/learning_rust_data_structure" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_rust_data_structure", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_rust_data_structure'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 255d021cb8214c82ca6d6002070da8d59b5c87a3
[INFO] checking mmmpa/learning_rust_data_structure against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmmpa%2Flearning_rust_data_structure" "/workspace/builds/worker-36/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-36/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mmmpa/learning_rust_data_structure on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mmmpa/learning_rust_data_structure
[INFO] finished tweaking git repo https://github.com/mmmpa/learning_rust_data_structure
[INFO] tweaked toml for git repo https://github.com/mmmpa/learning_rust_data_structure written to /workspace/builds/worker-36/source/Cargo.toml
[INFO] crate git repo https://github.com/mmmpa/learning_rust_data_structure already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "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-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8c23437d220d135e40187393dd36be6c1399aa729de171242f460cf6b74383fc
[INFO] running `Command { std: "docker" "start" "-a" "8c23437d220d135e40187393dd36be6c1399aa729de171242f460cf6b74383fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c23437d220d135e40187393dd36be6c1399aa729de171242f460cf6b74383fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c23437d220d135e40187393dd36be6c1399aa729de171242f460cf6b74383fc", kill_on_drop: false }`
[INFO] [stdout] 8c23437d220d135e40187393dd36be6c1399aa729de171242f460cf6b74383fc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b97c919944c0ba1587230d120ea92d417d24fe0111153a5d38d779c9cc5643c4
[INFO] running `Command { std: "docker" "start" "-a" "b97c919944c0ba1587230d120ea92d417d24fe0111153a5d38d779c9cc5643c4", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking trees v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/main.rs (2 fixes)
[INFO] [stderr]        Fixed src/binary_search_tree.rs (1 fix)
[INFO] [stderr]        Fixed src/parental_binary_search_tree.rs (1 fix)
[INFO] [stdout] warning: unused import: `core::borrow::BorrowMut`
[INFO] [stdout]  --> src/binary_search_tree.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use core::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::borrow::BorrowMut`
[INFO] [stdout]  --> src/parental_binary_search_tree.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use core::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Traced`
[INFO] [stdout]  --> src/binary_search_tree.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | type Traced<T> = Rc<RefCell<NodeBody<T>>>;
[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_search_tree.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn new(value: T) -> Node<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/binary_search_tree.rs:46:12
[INFO] [stdout]    |
[INFO] [stdout] 46 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/binary_search_tree.rs:53:12
[INFO] [stdout]    |
[INFO] [stdout] 53 |     pub fn insert(&mut self, v: T) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert_support`
[INFO] [stdout]   --> src/binary_search_tree.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fn insert_support(&mut self, root: Node<T>, v: T) -> Node<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `trace`
[INFO] [stdout]   --> src/binary_search_tree.rs:76:8
[INFO] [stdout]    |
[INFO] [stdout] 76 |     fn trace(&self) -> Vec<Traced<T>> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `trace_support`
[INFO] [stdout]   --> src/binary_search_tree.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 |     fn trace_support(&self, root: &Node<T>, result: &mut Vec<Traced<T>>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Traced`
[INFO] [stdout]  --> src/parental_binary_search_tree.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | type Traced<T> = Rc<RefCell<NodeBody<T>>>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `parent`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     parent: Node<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn new(value: T, parent: Node<T>) -> Node<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     pub fn insert(&mut self, v: T) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert_support`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn insert_support(&mut self, root: Node<T>, v: T, p: Node<T>) -> Node<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `trace`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 |     fn trace(&self) -> Vec<Traced<T>> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `trace_support`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:84:8
[INFO] [stdout]    |
[INFO] [stdout] 84 |     fn trace_support(&self, root: &Node<T>, result: &mut Vec<Traced<T>>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 17 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::borrow::BorrowMut`
[INFO] [stdout]  --> src/binary_search_tree.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use core::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::borrow::BorrowMut`
[INFO] [stdout]  --> src/parental_binary_search_tree.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use core::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `parent`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     parent: Node<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.50s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking trees v0.1.0 (/tmp/fixit)
[INFO] [stdout] warning: unused import: `core::borrow::BorrowMut`
[INFO] [stdout]  --> src/binary_search_tree.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use core::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::borrow::BorrowMut`
[INFO] [stdout]  --> src/binary_search_tree.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use core::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::borrow::BorrowMut`
[INFO] [stdout]  --> src/parental_binary_search_tree.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use core::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::borrow::BorrowMut`
[INFO] [stdout]  --> src/parental_binary_search_tree.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use core::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Traced`
[INFO] [stdout]  --> src/binary_search_tree.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | type Traced<T> = Rc<RefCell<NodeBody<T>>>;
[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_search_tree.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn new(value: T) -> Node<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/binary_search_tree.rs:46:12
[INFO] [stdout]    |
[INFO] [stdout] 46 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/binary_search_tree.rs:53:12
[INFO] [stdout]    |
[INFO] [stdout] 53 |     pub fn insert(&mut self, v: T) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert_support`
[INFO] [stdout]   --> src/binary_search_tree.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fn insert_support(&mut self, root: Node<T>, v: T) -> Node<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `trace`
[INFO] [stdout]   --> src/binary_search_tree.rs:76:8
[INFO] [stdout]    |
[INFO] [stdout] 76 |     fn trace(&self) -> Vec<Traced<T>> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `trace_support`
[INFO] [stdout]   --> src/binary_search_tree.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 |     fn trace_support(&self, root: &Node<T>, result: &mut Vec<Traced<T>>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Traced`
[INFO] [stdout]  --> src/parental_binary_search_tree.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | type Traced<T> = Rc<RefCell<NodeBody<T>>>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `parent`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     parent: Node<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn new(value: T, parent: Node<T>) -> Node<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 47 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     pub fn insert(&mut self, v: T) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert_support`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn insert_support(&mut self, root: Node<T>, v: T, p: Node<T>) -> Node<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `trace`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 |     fn trace(&self) -> Vec<Traced<T>> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `trace_support`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:84:8
[INFO] [stdout]    |
[INFO] [stdout] 84 |     fn trace_support(&self, root: &Node<T>, result: &mut Vec<Traced<T>>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `parent`
[INFO] [stdout]   --> src/parental_binary_search_tree.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     parent: Node<T>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 17 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.18s
[INFO] running `Command { std: "docker" "inspect" "b97c919944c0ba1587230d120ea92d417d24fe0111153a5d38d779c9cc5643c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b97c919944c0ba1587230d120ea92d417d24fe0111153a5d38d779c9cc5643c4", kill_on_drop: false }`
[INFO] [stdout] b97c919944c0ba1587230d120ea92d417d24fe0111153a5d38d779c9cc5643c4