[INFO] updating cached repository https://github.com/CCBTony/rust_datastruct
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 25b0fc476ee391f5c4a90961f1ea540285622ffe
[INFO] testing CCBTony/rust_datastruct against 1.45.2 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCCBTony%2Frust_datastruct" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CCBTony/rust_datastruct on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/CCBTony/rust_datastruct
[INFO] finished tweaking git repo https://github.com/CCBTony/rust_datastruct
[INFO] tweaked toml for git repo https://github.com/CCBTony/rust_datastruct written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/CCBTony/rust_datastruct already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: the lock file /workspace/builds/worker-9/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4375dda82f62beafd79afb9bcda3dd97a7d0ca38af4d9abedfb80ba2a387b467
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4375dda82f62beafd79afb9bcda3dd97a7d0ca38af4d9abedfb80ba2a387b467", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4375dda82f62beafd79afb9bcda3dd97a7d0ca38af4d9abedfb80ba2a387b467", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4375dda82f62beafd79afb9bcda3dd97a7d0ca38af4d9abedfb80ba2a387b467", kill_on_drop: false }`
[INFO] [stdout] 4375dda82f62beafd79afb9bcda3dd97a7d0ca38af4d9abedfb80ba2a387b467
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dfbc59625bd140bfa96fed6f32718a385ed96ad38cd2515a977a2d9e48ce09c7
[INFO] running `Command { std: "docker" "start" "-a" "dfbc59625bd140bfa96fed6f32718a385ed96ad38cd2515a977a2d9e48ce09c7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling getset v0.0.7
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `tree::*`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use tree::*;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cur_p`
[INFO] [stdout]    --> src/tree.rs:434:21
[INFO] [stdout]     |
[INFO] [stdout] 434 |                 let cur_p = cur.as_ptr();
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_cur_p`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:555:25
[INFO] [stdout]     |
[INFO] [stdout] 555 |                     let mut k1 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:556:25
[INFO] [stdout]     |
[INFO] [stdout] 556 |                     let mut k2 = link_right(Rc::clone(&k1), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:557:25
[INFO] [stdout]     |
[INFO] [stdout] 557 |                     let mut y = link_left(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:567:25
[INFO] [stdout]     |
[INFO] [stdout] 567 |                     let mut k1 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:568:25
[INFO] [stdout]     |
[INFO] [stdout] 568 |                     let mut k3 = link_left(Rc::clone(&k1), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:569:25
[INFO] [stdout]     |
[INFO] [stdout] 569 |                     let mut k2 = link_right(Rc::clone(&k3), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:570:25
[INFO] [stdout]     |
[INFO] [stdout] 570 |                     let mut b = link_left(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:571:25
[INFO] [stdout]     |
[INFO] [stdout] 571 |                     let mut c = link_right(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:583:25
[INFO] [stdout]     |
[INFO] [stdout] 583 |                     let mut k2 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:584:25
[INFO] [stdout]     |
[INFO] [stdout] 584 |                     let mut k1 = link_left(Rc::clone(&k2), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:585:25
[INFO] [stdout]     |
[INFO] [stdout] 585 |                     let mut y = link_left(Rc::clone(&k1), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:595:25
[INFO] [stdout]     |
[INFO] [stdout] 595 |                     let mut k3 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:596:25
[INFO] [stdout]     |
[INFO] [stdout] 596 |                     let mut k1 = link_left(Rc::clone(&k3), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:597:25
[INFO] [stdout]     |
[INFO] [stdout] 597 |                     let mut k2 = link_right(Rc::clone(&k1), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:598:25
[INFO] [stdout]     |
[INFO] [stdout] 598 |                     let mut b = link_left(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:599:25
[INFO] [stdout]     |
[INFO] [stdout] 599 |                     let mut c = link_right(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/tree.rs:46:16
[INFO] [stdout]    |
[INFO] [stdout] 46 |         pub fn new(key: String, value: V) -> Self {
[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: `depth`
[INFO] [stdout]   --> src/tree.rs:56:16
[INFO] [stdout]    |
[INFO] [stdout] 56 |         pub fn depth(&self) -> i32 {
[INFO] [stdout]    |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dumps`
[INFO] [stdout]    --> src/tree.rs:316:12
[INFO] [stdout]     |
[INFO] [stdout] 316 |     pub fn dumps<V: Clone + Display>(node: Rc<RefCell<BinaryNode<V>>>, level: i32) {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/tree.rs:473:16
[INFO] [stdout]     |
[INFO] [stdout] 473 |         pub fn new() -> Self { Self { root: None } }
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `min_val`
[INFO] [stdout]    --> src/tree.rs:475:16
[INFO] [stdout]     |
[INFO] [stdout] 475 |         pub fn min_val(&self) -> Option<Rc<RefCell<V>>> {
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `min_val_clone`
[INFO] [stdout]    --> src/tree.rs:493:16
[INFO] [stdout]     |
[INFO] [stdout] 493 |         pub fn min_val_clone(&self) -> Option<V> {
[INFO] [stdout]     |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `max_val`
[INFO] [stdout]    --> src/tree.rs:500:16
[INFO] [stdout]     |
[INFO] [stdout] 500 |         pub fn max_val(&self) -> Option<Rc<RefCell<V>>> {
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `max_val_clone`
[INFO] [stdout]    --> src/tree.rs:518:16
[INFO] [stdout]     |
[INFO] [stdout] 518 |         pub fn max_val_clone(&self) -> Option<V> {
[INFO] [stdout]     |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `height`
[INFO] [stdout]    --> src/tree.rs:525:16
[INFO] [stdout]     |
[INFO] [stdout] 525 |         pub fn height(&self) -> i32 {
[INFO] [stdout]     |                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 27 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.38s
[INFO] running `Command { std: "docker" "inspect" "dfbc59625bd140bfa96fed6f32718a385ed96ad38cd2515a977a2d9e48ce09c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfbc59625bd140bfa96fed6f32718a385ed96ad38cd2515a977a2d9e48ce09c7", kill_on_drop: false }`
[INFO] [stdout] dfbc59625bd140bfa96fed6f32718a385ed96ad38cd2515a977a2d9e48ce09c7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 30898938b049a1b081eb42f4a5216d9c446c30ad4d3a941815a7c59da1753e1c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "30898938b049a1b081eb42f4a5216d9c446c30ad4d3a941815a7c59da1753e1c", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `tree::*`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use tree::*;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cur_p`
[INFO] [stdout]    --> src/tree.rs:434:21
[INFO] [stdout]     |
[INFO] [stdout] 434 |                 let cur_p = cur.as_ptr();
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_cur_p`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:555:25
[INFO] [stdout]     |
[INFO] [stdout] 555 |                     let mut k1 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:556:25
[INFO] [stdout]     |
[INFO] [stdout] 556 |                     let mut k2 = link_right(Rc::clone(&k1), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:557:25
[INFO] [stdout]     |
[INFO] [stdout] 557 |                     let mut y = link_left(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:567:25
[INFO] [stdout]     |
[INFO] [stdout] 567 |                     let mut k1 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:568:25
[INFO] [stdout]     |
[INFO] [stdout] 568 |                     let mut k3 = link_left(Rc::clone(&k1), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:569:25
[INFO] [stdout]     |
[INFO] [stdout] 569 |                     let mut k2 = link_right(Rc::clone(&k3), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:570:25
[INFO] [stdout]     |
[INFO] [stdout] 570 |                     let mut b = link_left(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:571:25
[INFO] [stdout]     |
[INFO] [stdout] 571 |                     let mut c = link_right(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:583:25
[INFO] [stdout]     |
[INFO] [stdout] 583 |                     let mut k2 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:584:25
[INFO] [stdout]     |
[INFO] [stdout] 584 |                     let mut k1 = link_left(Rc::clone(&k2), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:585:25
[INFO] [stdout]     |
[INFO] [stdout] 585 |                     let mut y = link_left(Rc::clone(&k1), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:595:25
[INFO] [stdout]     |
[INFO] [stdout] 595 |                     let mut k3 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:596:25
[INFO] [stdout]     |
[INFO] [stdout] 596 |                     let mut k1 = link_left(Rc::clone(&k3), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:597:25
[INFO] [stdout]     |
[INFO] [stdout] 597 |                     let mut k2 = link_right(Rc::clone(&k1), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:598:25
[INFO] [stdout]     |
[INFO] [stdout] 598 |                     let mut b = link_left(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:599:25
[INFO] [stdout]     |
[INFO] [stdout] 599 |                     let mut c = link_right(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/tree.rs:46:16
[INFO] [stdout]    |
[INFO] [stdout] 46 |         pub fn new(key: String, value: V) -> Self {
[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: `depth`
[INFO] [stdout]   --> src/tree.rs:56:16
[INFO] [stdout]    |
[INFO] [stdout] 56 |         pub fn depth(&self) -> i32 {
[INFO] [stdout]    |                ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dumps`
[INFO] [stdout]    --> src/tree.rs:316:12
[INFO] [stdout]     |
[INFO] [stdout] 316 |     pub fn dumps<V: Clone + Display>(node: Rc<RefCell<BinaryNode<V>>>, level: i32) {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/tree.rs:473:16
[INFO] [stdout]     |
[INFO] [stdout] 473 |         pub fn new() -> Self { Self { root: None } }
[INFO] [stdout]     |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `min_val`
[INFO] [stdout]    --> src/tree.rs:475:16
[INFO] [stdout]     |
[INFO] [stdout] 475 |         pub fn min_val(&self) -> Option<Rc<RefCell<V>>> {
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `min_val_clone`
[INFO] [stdout]    --> src/tree.rs:493:16
[INFO] [stdout]     |
[INFO] [stdout] 493 |         pub fn min_val_clone(&self) -> Option<V> {
[INFO] [stdout]     |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `max_val`
[INFO] [stdout]    --> src/tree.rs:500:16
[INFO] [stdout]     |
[INFO] [stdout] 500 |         pub fn max_val(&self) -> Option<Rc<RefCell<V>>> {
[INFO] [stdout]     |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `max_val_clone`
[INFO] [stdout]    --> src/tree.rs:518:16
[INFO] [stdout]     |
[INFO] [stdout] 518 |         pub fn max_val_clone(&self) -> Option<V> {
[INFO] [stdout]     |                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `height`
[INFO] [stdout]    --> src/tree.rs:525:16
[INFO] [stdout]     |
[INFO] [stdout] 525 |         pub fn height(&self) -> i32 {
[INFO] [stdout]     |                ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 27 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::search::*`
[INFO] [stdout]    --> src/tree.rs:655:13
[INFO] [stdout]     |
[INFO] [stdout] 655 |         use super::search::*;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tree::*`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use tree::*;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::search`
[INFO] [stdout]    --> src/tree.rs:623:13
[INFO] [stdout]     |
[INFO] [stdout] 623 |         use super::search::*;
[INFO] [stdout]     |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cur_p`
[INFO] [stdout]    --> src/tree.rs:434:21
[INFO] [stdout]     |
[INFO] [stdout] 434 |                 let cur_p = cur.as_ptr();
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_cur_p`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:555:25
[INFO] [stdout]     |
[INFO] [stdout] 555 |                     let mut k1 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:556:25
[INFO] [stdout]     |
[INFO] [stdout] 556 |                     let mut k2 = link_right(Rc::clone(&k1), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:557:25
[INFO] [stdout]     |
[INFO] [stdout] 557 |                     let mut y = link_left(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:567:25
[INFO] [stdout]     |
[INFO] [stdout] 567 |                     let mut k1 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:568:25
[INFO] [stdout]     |
[INFO] [stdout] 568 |                     let mut k3 = link_left(Rc::clone(&k1), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:569:25
[INFO] [stdout]     |
[INFO] [stdout] 569 |                     let mut k2 = link_right(Rc::clone(&k3), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:570:25
[INFO] [stdout]     |
[INFO] [stdout] 570 |                     let mut b = link_left(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:571:25
[INFO] [stdout]     |
[INFO] [stdout] 571 |                     let mut c = link_right(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:583:25
[INFO] [stdout]     |
[INFO] [stdout] 583 |                     let mut k2 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:584:25
[INFO] [stdout]     |
[INFO] [stdout] 584 |                     let mut k1 = link_left(Rc::clone(&k2), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:585:25
[INFO] [stdout]     |
[INFO] [stdout] 585 |                     let mut y = link_left(Rc::clone(&k1), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:595:25
[INFO] [stdout]     |
[INFO] [stdout] 595 |                     let mut k3 = Rc::clone(&root);
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:596:25
[INFO] [stdout]     |
[INFO] [stdout] 596 |                     let mut k1 = link_left(Rc::clone(&k3), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:597:25
[INFO] [stdout]     |
[INFO] [stdout] 597 |                     let mut k2 = link_right(Rc::clone(&k1), None).unwrap();
[INFO] [stdout]     |                         ----^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:598:25
[INFO] [stdout]     |
[INFO] [stdout] 598 |                     let mut b = link_left(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tree.rs:599:25
[INFO] [stdout]     |
[INFO] [stdout] 599 |                     let mut c = link_right(Rc::clone(&k2), None);
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.76s
[INFO] running `Command { std: "docker" "inspect" "30898938b049a1b081eb42f4a5216d9c446c30ad4d3a941815a7c59da1753e1c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30898938b049a1b081eb42f4a5216d9c446c30ad4d3a941815a7c59da1753e1c", kill_on_drop: false }`
[INFO] [stdout] 30898938b049a1b081eb42f4a5216d9c446c30ad4d3a941815a7c59da1753e1c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 289d523cbad97220436ecb87f29ce50b207a51c8be53e95d65fb5c51b4c52038
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "289d523cbad97220436ecb87f29ce50b207a51c8be53e95d65fb5c51b4c52038", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `tree::*`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use tree::*;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cur_p`
[INFO] [stderr]    --> src/tree.rs:434:21
[INFO] [stderr]     |
[INFO] [stderr] 434 |                 let cur_p = cur.as_ptr();
[INFO] [stderr]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_cur_p`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:555:25
[INFO] [stderr]     |
[INFO] [stderr] 555 |                     let mut k1 = Rc::clone(&root);
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:556:25
[INFO] [stderr]     |
[INFO] [stderr] 556 |                     let mut k2 = link_right(Rc::clone(&k1), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:557:25
[INFO] [stderr]     |
[INFO] [stderr] 557 |                     let mut y = link_left(Rc::clone(&k2), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:567:25
[INFO] [stderr]     |
[INFO] [stderr] 567 |                     let mut k1 = Rc::clone(&root);
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:568:25
[INFO] [stderr]     |
[INFO] [stderr] 568 |                     let mut k3 = link_left(Rc::clone(&k1), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:569:25
[INFO] [stderr]     |
[INFO] [stderr] 569 |                     let mut k2 = link_right(Rc::clone(&k3), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:570:25
[INFO] [stderr]     |
[INFO] [stderr] 570 |                     let mut b = link_left(Rc::clone(&k2), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:571:25
[INFO] [stderr]     |
[INFO] [stderr] 571 |                     let mut c = link_right(Rc::clone(&k2), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:583:25
[INFO] [stderr]     |
[INFO] [stderr] 583 |                     let mut k2 = Rc::clone(&root);
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:584:25
[INFO] [stderr]     |
[INFO] [stderr] 584 |                     let mut k1 = link_left(Rc::clone(&k2), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:585:25
[INFO] [stderr]     |
[INFO] [stderr] 585 |                     let mut y = link_left(Rc::clone(&k1), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:595:25
[INFO] [stderr]     |
[INFO] [stderr] 595 |                     let mut k3 = Rc::clone(&root);
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:596:25
[INFO] [stderr]     |
[INFO] [stderr] 596 |                     let mut k1 = link_left(Rc::clone(&k3), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:597:25
[INFO] [stderr]     |
[INFO] [stderr] 597 |                     let mut k2 = link_right(Rc::clone(&k1), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:598:25
[INFO] [stderr]     |
[INFO] [stderr] 598 |                     let mut b = link_left(Rc::clone(&k2), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:599:25
[INFO] [stderr]     |
[INFO] [stderr] 599 |                     let mut c = link_right(Rc::clone(&k2), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/tree.rs:46:16
[INFO] [stderr]    |
[INFO] [stderr] 46 |         pub fn new(key: String, value: V) -> Self {
[INFO] [stderr]    |                ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `depth`
[INFO] [stderr]   --> src/tree.rs:56:16
[INFO] [stderr]    |
[INFO] [stderr] 56 |         pub fn depth(&self) -> i32 {
[INFO] [stderr]    |                ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `dumps`
[INFO] [stderr]    --> src/tree.rs:316:12
[INFO] [stderr]     |
[INFO] [stderr] 316 |     pub fn dumps<V: Clone + Display>(node: Rc<RefCell<BinaryNode<V>>>, level: i32) {
[INFO] [stderr]     |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/tree.rs:473:16
[INFO] [stderr]     |
[INFO] [stderr] 473 |         pub fn new() -> Self { Self { root: None } }
[INFO] [stderr]     |                ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `min_val`
[INFO] [stderr]    --> src/tree.rs:475:16
[INFO] [stderr]     |
[INFO] [stderr] 475 |         pub fn min_val(&self) -> Option<Rc<RefCell<V>>> {
[INFO] [stderr]     |                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `min_val_clone`
[INFO] [stderr]    --> src/tree.rs:493:16
[INFO] [stderr]     |
[INFO] [stderr] 493 |         pub fn min_val_clone(&self) -> Option<V> {
[INFO] [stderr]     |                ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `max_val`
[INFO] [stderr]    --> src/tree.rs:500:16
[INFO] [stderr]     |
[INFO] [stderr] 500 |         pub fn max_val(&self) -> Option<Rc<RefCell<V>>> {
[INFO] [stderr]     |                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `max_val_clone`
[INFO] [stderr]    --> src/tree.rs:518:16
[INFO] [stderr]     |
[INFO] [stderr] 518 |         pub fn max_val_clone(&self) -> Option<V> {
[INFO] [stderr]     |                ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `height`
[INFO] [stderr]    --> src/tree.rs:525:16
[INFO] [stderr]     |
[INFO] [stderr] 525 |         pub fn height(&self) -> i32 {
[INFO] [stderr]     |                ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 27 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::search::*`
[INFO] [stderr]    --> src/tree.rs:655:13
[INFO] [stderr]     |
[INFO] [stderr] 655 |         use super::search::*;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tree::*`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use tree::*;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::search`
[INFO] [stderr]    --> src/tree.rs:623:13
[INFO] [stderr]     |
[INFO] [stderr] 623 |         use super::search::*;
[INFO] [stderr]     |             ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cur_p`
[INFO] [stderr]    --> src/tree.rs:434:21
[INFO] [stderr]     |
[INFO] [stderr] 434 |                 let cur_p = cur.as_ptr();
[INFO] [stderr]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_cur_p`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:555:25
[INFO] [stderr]     |
[INFO] [stderr] 555 |                     let mut k1 = Rc::clone(&root);
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:556:25
[INFO] [stderr]     |
[INFO] [stderr] 556 |                     let mut k2 = link_right(Rc::clone(&k1), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:557:25
[INFO] [stderr]     |
[INFO] [stderr] 557 |                     let mut y = link_left(Rc::clone(&k2), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:567:25
[INFO] [stderr]     |
[INFO] [stderr] 567 |                     let mut k1 = Rc::clone(&root);
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:568:25
[INFO] [stderr]     |
[INFO] [stderr] 568 |                     let mut k3 = link_left(Rc::clone(&k1), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:569:25
[INFO] [stderr]     |
[INFO] [stderr] 569 |                     let mut k2 = link_right(Rc::clone(&k3), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:570:25
[INFO] [stderr]     |
[INFO] [stderr] 570 |                     let mut b = link_left(Rc::clone(&k2), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:571:25
[INFO] [stderr]     |
[INFO] [stderr] 571 |                     let mut c = link_right(Rc::clone(&k2), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:583:25
[INFO] [stderr]     |
[INFO] [stderr] 583 |                     let mut k2 = Rc::clone(&root);
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:584:25
[INFO] [stderr]     |
[INFO] [stderr] 584 |                     let mut k1 = link_left(Rc::clone(&k2), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:585:25
[INFO] [stderr]     |
[INFO] [stderr] 585 |                     let mut y = link_left(Rc::clone(&k1), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:595:25
[INFO] [stderr]     |
[INFO] [stderr] 595 |                     let mut k3 = Rc::clone(&root);
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:596:25
[INFO] [stderr]     |
[INFO] [stderr] 596 |                     let mut k1 = link_left(Rc::clone(&k3), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:597:25
[INFO] [stderr]     |
[INFO] [stderr] 597 |                     let mut k2 = link_right(Rc::clone(&k1), None).unwrap();
[INFO] [stderr]     |                         ----^^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:598:25
[INFO] [stderr]     |
[INFO] [stderr] 598 |                     let mut b = link_left(Rc::clone(&k2), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tree.rs:599:25
[INFO] [stderr]     |
[INFO] [stderr] 599 |                     let mut c = link_right(Rc::clone(&k2), None);
[INFO] [stderr]     |                         ----^
[INFO] [stderr]     |                         |
[INFO] [stderr]     |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 20 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rust_study-f3bb415a2a7d1f7c
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tree::tests::create_avl_tree ... ok
[INFO] [stdout] test tree::tests::binary_node ... ok
[INFO] [stdout] test tree::tests::link_test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/t-a583b396ae442d25
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "289d523cbad97220436ecb87f29ce50b207a51c8be53e95d65fb5c51b4c52038", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "289d523cbad97220436ecb87f29ce50b207a51c8be53e95d65fb5c51b4c52038", kill_on_drop: false }`
[INFO] [stdout] 289d523cbad97220436ecb87f29ce50b207a51c8be53e95d65fb5c51b4c52038