[INFO] cloning repository https://github.com/Hagi013/toy-rb-tree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Hagi013/toy-rb-tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHagi013%2Ftoy-rb-tree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHagi013%2Ftoy-rb-tree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3c525e5a22af3d0cb8d9e08799a5da3921569f35
[INFO] testing Hagi013/toy-rb-tree against master#733b47ea4b1b86216f14ef56e49440c33933f230+rustflags=-Copt-level=3 for pr-138759
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHagi013%2Ftoy-rb-tree" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Hagi013/toy-rb-tree
[INFO] finished tweaking git repo https://github.com/Hagi013/toy-rb-tree
[INFO] tweaked toml for git repo https://github.com/Hagi013/toy-rb-tree written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Hagi013/toy-rb-tree on toolchain 733b47ea4b1b86216f14ef56e49440c33933f230
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Hagi013/toy-rb-tree already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8e2aa05aebc1b032fa954a848b9c940d99e063b95d2121db4f7bd84d5642bd8f
[INFO] running `Command { std: "docker" "start" "-a" "8e2aa05aebc1b032fa954a848b9c940d99e063b95d2121db4f7bd84d5642bd8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8e2aa05aebc1b032fa954a848b9c940d99e063b95d2121db4f7bd84d5642bd8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e2aa05aebc1b032fa954a848b9c940d99e063b95d2121db4f7bd84d5642bd8f", kill_on_drop: false }`
[INFO] [stdout] 8e2aa05aebc1b032fa954a848b9c940d99e063b95d2121db4f7bd84d5642bd8f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Copt-level=3" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 73145f5b3d28b8796d98c3532bcf46ba2cba3e405092e5a49537d12fe8dcf3f8
[INFO] running `Command { std: "docker" "start" "-a" "73145f5b3d28b8796d98c3532bcf46ba2cba3e405092e5a49537d12fe8dcf3f8", kill_on_drop: false }`
[INFO] [stderr]    Compiling rb-tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Display`
[INFO] [stdout]  --> src/main.rs:3:41
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::fmt::{Debug, Formatter, Error, Display};
[INFO] [stdout]   |                                         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:247:13
[INFO] [stdout]     |
[INFO] [stdout] 247 |         let mut node = 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: unnecessary `unsafe` block
[INFO] [stdout]    --> src/main.rs:323:21
[INFO] [stdout]     |
[INFO] [stdout] 321 |             unsafe {
[INFO] [stdout]     |             ------ because it's nested under this `unsafe` block
[INFO] [stdout] 322 |                 if (*current_node_ptr).key == key {
[INFO] [stdout] 323 |                     unsafe { (*current_node_ptr).value = value as *const V as *mut V };
[INFO] [stdout]     |                     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:313:17
[INFO] [stdout]     |
[INFO] [stdout] 313 |             let mut root: *mut RBNode<K, V> = Box::into_raw(Box::from(RBNode::new(key, value)));
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `fixup_node` is never read
[INFO] [stdout]    --> src/main.rs:370:21
[INFO] [stdout]     |
[INFO] [stdout] 370 |             let mut fixup_node: Option<*mut RBNode<K, V>> = None;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:372:21
[INFO] [stdout]     |
[INFO] [stdout] 372 |                 let mut right_node = (*remove_node).right;
[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/main.rs:410:21
[INFO] [stdout]     |
[INFO] [stdout] 410 |                 let mut left_node = (*remove_node).left;
[INFO] [stdout]     |                     ----^^^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `pair` is never used
[INFO] [stdout]   --> src/main.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | impl<K: Ord + Clone + Debug, V> RBNode<K, V> {
[INFO] [stdout]    | -------------------------------------------- method in this implementation
[INFO] [stdout] 33 |     #[inline]
[INFO] [stdout] 34 |     fn pair(self) -> (K, *mut V) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/main.rs:92:8
[INFO] [stdout]     |
[INFO] [stdout] 78  | impl<K: Ord + Clone + Debug, V> RBNode<K, V> {
[INFO] [stdout]     | -------------------------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 92  |     fn is_leaf(&self) -> bool { self.leaf }
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 95  |     fn is_node(&self) -> bool { !self.leaf }
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 103 |     fn set_red_color(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 108 |     fn set_black_color(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 113 |     fn get_color(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 123 |     fn parent_is_red(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 132 |     fn is_black(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 137 |     fn parent_is_black(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 207 |     fn prev(&self) -> Option<RBNode<K, V>> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 229 |     fn max_node(&self) -> RBNode<K, V> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `len`, `find`, `find_minimum`, `remove`, `transparent`, and `delete_fixup` are never used
[INFO] [stdout]    --> src/main.rs:274:12
[INFO] [stdout]     |
[INFO] [stdout] 266 | impl<K: Ord + Clone + Debug, V> RBTree<K, V> {
[INFO] [stdout]     | -------------------------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 274 |     pub fn len(&self) -> usize {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 278 |     pub fn find(&self, k: K) -> Option<*mut RBNode<K, V>> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 304 |     pub fn find_minimum(&self, partial: *mut RBNode<K, V>) -> *mut RBNode<K, V> {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 359 |     pub fn remove(&mut self, key: K) -> Result<(), String> {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 583 |     fn transparent(&mut self, removal_node: *mut RBNode<K, V>, promotion_node: Option<*mut RBNode<K, V>>) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 598 |     fn delete_fixup(&mut self, promotion_node: Option<*mut RBNode<K, V>>) {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     tree.insert(10, &2);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let _ = tree.insert(10, &2);
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     tree.insert(3, &1);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let _ = tree.insert(3, &1);
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     tree.insert(1, &2);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let _ = tree.insert(1, &2);
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `Command { std: "docker" "inspect" "73145f5b3d28b8796d98c3532bcf46ba2cba3e405092e5a49537d12fe8dcf3f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73145f5b3d28b8796d98c3532bcf46ba2cba3e405092e5a49537d12fe8dcf3f8", kill_on_drop: false }`
[INFO] [stdout] 73145f5b3d28b8796d98c3532bcf46ba2cba3e405092e5a49537d12fe8dcf3f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Copt-level=3" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 74f197563fa63294985b5a1cb014cba51b2b0a649d357fcf51397345fe05a561
[INFO] running `Command { std: "docker" "start" "-a" "74f197563fa63294985b5a1cb014cba51b2b0a649d357fcf51397345fe05a561", kill_on_drop: false }`
[INFO] [stderr]    Compiling rb-tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Display`
[INFO] [stdout]  --> src/main.rs:3:41
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::fmt::{Debug, Formatter, Error, Display};
[INFO] [stdout]   |                                         ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:247:13
[INFO] [stdout]     |
[INFO] [stdout] 247 |         let mut node = 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: unnecessary `unsafe` block
[INFO] [stdout]    --> src/main.rs:323:21
[INFO] [stdout]     |
[INFO] [stdout] 321 |             unsafe {
[INFO] [stdout]     |             ------ because it's nested under this `unsafe` block
[INFO] [stdout] 322 |                 if (*current_node_ptr).key == key {
[INFO] [stdout] 323 |                     unsafe { (*current_node_ptr).value = value as *const V as *mut V };
[INFO] [stdout]     |                     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:313:17
[INFO] [stdout]     |
[INFO] [stdout] 313 |             let mut root: *mut RBNode<K, V> = Box::into_raw(Box::from(RBNode::new(key, value)));
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `fixup_node` is never read
[INFO] [stdout]    --> src/main.rs:370:21
[INFO] [stdout]     |
[INFO] [stdout] 370 |             let mut fixup_node: Option<*mut RBNode<K, V>> = None;
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:372:21
[INFO] [stdout]     |
[INFO] [stdout] 372 |                 let mut right_node = (*remove_node).right;
[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/main.rs:410:21
[INFO] [stdout]     |
[INFO] [stdout] 410 |                 let mut left_node = (*remove_node).left;
[INFO] [stdout]     |                     ----^^^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/main.rs:762:28
[INFO] [stdout]     |
[INFO] [stdout] 758 |         unsafe {
[INFO] [stdout]     |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 762 |             assert_eq!(10, unsafe { (*node).key });
[INFO] [stdout]     |                            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/main.rs:766:27
[INFO] [stdout]     |
[INFO] [stdout] 758 |         unsafe {
[INFO] [stdout]     |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 766 |             assert_eq!(3, unsafe { (*node).key });
[INFO] [stdout]     |                           ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/main.rs:779:27
[INFO] [stdout]     |
[INFO] [stdout] 758 |         unsafe {
[INFO] [stdout]     |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 779 |             assert_eq!(1, unsafe { (*node).key });
[INFO] [stdout]     |                           ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/main.rs:783:27
[INFO] [stdout]     |
[INFO] [stdout] 758 |         unsafe {
[INFO] [stdout]     |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 783 |             assert_eq!(5, unsafe { (*node).key });
[INFO] [stdout]     |                           ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/main.rs:787:28
[INFO] [stdout]     |
[INFO] [stdout] 758 |         unsafe {
[INFO] [stdout]     |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 787 |             assert_eq!(20, unsafe { (*node).key });
[INFO] [stdout]     |                            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/main.rs:791:28
[INFO] [stdout]     |
[INFO] [stdout] 758 |         unsafe {
[INFO] [stdout]     |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 791 |             assert_eq!(30, unsafe { (*node).key });
[INFO] [stdout]     |                            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/main.rs:795:28
[INFO] [stdout]     |
[INFO] [stdout] 758 |         unsafe {
[INFO] [stdout]     |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 795 |             assert_eq!(50, unsafe { (*node).key });
[INFO] [stdout]     |                            ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/main.rs:802:9
[INFO] [stdout]     |
[INFO] [stdout] 802 |         unsafe {
[INFO] [stdout]     |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1152:49
[INFO] [stdout]      |
[INFO] [stdout] 834  |         unsafe {
[INFO] [stdout]      |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1152 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).key }, unsafe { (*tree.root.unwrap()).color });
[INFO] [stdout]      |                                                 ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1152:87
[INFO] [stdout]      |
[INFO] [stdout] 834  |         unsafe {
[INFO] [stdout]      |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1152 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).key }, unsafe { (*tree.root.unwrap()).color });
[INFO] [stdout]      |                                                                                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1156:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1156 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().key }, unsafe { (*tree.root.unwrap()).left()...
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1156:103
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1156 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().key }, unsafe { (*tree.root.unwrap()).left()...
[INFO] [stdout]      |                                                                                                     ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1160:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1160 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().key }, unsafe { (*tree.root.unwrap()).right...
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1160:104
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1160 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().key }, unsafe { (*tree.root.unwrap()).right...
[INFO] [stdout]      |                                                                                                      ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1164:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1164 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().left().unwrap().key }, unsafe { (*tree.root....
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1164:119
[INFO] [stdout]      |
[INFO] [stdout] 834  |         unsafe {
[INFO] [stdout]      |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1164 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().left().unwrap().key }, unsafe { (*tree.roo...
[INFO] [stdout]      |                                                                                                                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1168:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1168 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().key }, unsafe { (*tree.root...
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1168:120
[INFO] [stdout]      |
[INFO] [stdout] 834  |         unsafe {
[INFO] [stdout]      |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1168 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().key }, unsafe { (*tree.ro...
[INFO] [stdout]      |                                                                                                                        ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1172:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1172 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().left().unwrap().key }, unsafe { (*tree.root...
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1172:120
[INFO] [stdout]      |
[INFO] [stdout] 834  |         unsafe {
[INFO] [stdout]      |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1172 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().left().unwrap().key }, unsafe { (*tree.ro...
[INFO] [stdout]      |                                                                                                                        ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1176:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1176 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().key }, unsafe { (*tree.roo...
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1176:121
[INFO] [stdout]      |
[INFO] [stdout] 834  |         unsafe {
[INFO] [stdout]      |         ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1176 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().key }, unsafe { (*tree.r...
[INFO] [stdout]      |                                                                                                                         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1180:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1180 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().left().unwrap().key }, unsa...
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1180:136
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1180 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().left().unwrap().key }, unsafe { ...
[INFO] [stdout]      |                                                                                                                                      ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1184:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1184 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().right().unwrap().key }, uns...
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1184:137
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1184 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().right().unwrap().key }, unsafe { ...
[INFO] [stdout]      |                                                                                                                                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1188:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1188 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().left().unwrap().key }, uns...
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1188:137
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1188 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().left().unwrap().key }, unsafe { ...
[INFO] [stdout]      |                                                                                                                                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1192:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1192 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().right().unwrap().key }, un...
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1192:138
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1192 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().right().unwrap().key }, unsafe { ...
[INFO] [stdout]      |                                                                                                                                        ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1196:49
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1196 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().right().unwrap().right().u...
[INFO] [stdout]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]     --> src/main.rs:1196:155
[INFO] [stdout]      |
[INFO] [stdout] 834  | ...   unsafe {
[INFO] [stdout]      |       ------ because it's nested under this `unsafe` block
[INFO] [stdout] ...
[INFO] [stdout] 1196 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().right().unwrap().right().unwrap().key }, unsafe { ...
[INFO] [stdout]      |                                                                                                                                                         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `pair` is never used
[INFO] [stdout]   --> src/main.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | impl<K: Ord + Clone + Debug, V> RBNode<K, V> {
[INFO] [stdout]    | -------------------------------------------- method in this implementation
[INFO] [stdout] 33 |     #[inline]
[INFO] [stdout] 34 |     fn pair(self) -> (K, *mut V) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/main.rs:95:8
[INFO] [stdout]     |
[INFO] [stdout] 78  | impl<K: Ord + Clone + Debug, V> RBNode<K, V> {
[INFO] [stdout]     | -------------------------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 95  |     fn is_node(&self) -> bool { !self.leaf }
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 103 |     fn set_red_color(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 108 |     fn set_black_color(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 113 |     fn get_color(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 123 |     fn parent_is_red(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 137 |     fn parent_is_black(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 207 |     fn prev(&self) -> Option<RBNode<K, V>> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 229 |     fn max_node(&self) -> RBNode<K, V> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     tree.insert(10, &2);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let _ = tree.insert(10, &2);
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     tree.insert(3, &1);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let _ = tree.insert(3, &1);
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     tree.insert(1, &2);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let _ = tree.insert(1, &2);
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:724:9
[INFO] [stdout]     |
[INFO] [stdout] 724 |         tree.insert(10, &2);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 724 |         let _ = tree.insert(10, &2);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:725:9
[INFO] [stdout]     |
[INFO] [stdout] 725 |         tree.insert(3, &1);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 725 |         let _ = tree.insert(3, &1);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:726:9
[INFO] [stdout]     |
[INFO] [stdout] 726 |         tree.insert(1, &2);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 726 |         let _ = tree.insert(1, &2);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:727:9
[INFO] [stdout]     |
[INFO] [stdout] 727 |         tree.insert(5, &3);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 727 |         let _ = tree.insert(5, &3);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:728:9
[INFO] [stdout]     |
[INFO] [stdout] 728 |         tree.insert(20, &4);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 728 |         let _ = tree.insert(20, &4);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:729:9
[INFO] [stdout]     |
[INFO] [stdout] 729 |         tree.insert(25, &5);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 729 |         let _ = tree.insert(25, &5);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:730:9
[INFO] [stdout]     |
[INFO] [stdout] 730 |         tree.insert(30, &5);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 730 |         let _ = tree.insert(30, &5);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:731:9
[INFO] [stdout]     |
[INFO] [stdout] 731 |         tree.insert(40, &6);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 731 |         let _ = tree.insert(40, &6);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:732:9
[INFO] [stdout]     |
[INFO] [stdout] 732 |         tree.insert(8, &6);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 732 |         let _ = tree.insert(8, &6);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:733:9
[INFO] [stdout]     |
[INFO] [stdout] 733 |         tree.insert(9, &6);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 733 |         let _ = tree.insert(9, &6);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:734:9
[INFO] [stdout]     |
[INFO] [stdout] 734 |         tree.insert(50, &6);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 734 |         let _ = tree.insert(50, &6);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:735:9
[INFO] [stdout]     |
[INFO] [stdout] 735 |         tree.insert(60, &6);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 735 |         let _ = tree.insert(60, &6);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:760:13
[INFO] [stdout]     |
[INFO] [stdout] 760 |             tree.insert(10, &2);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 760 |             let _ = tree.insert(10, &2);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:764:13
[INFO] [stdout]     |
[INFO] [stdout] 764 |             tree.insert(3, &1);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 764 |             let _ = tree.insert(3, &1);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:768:13
[INFO] [stdout]     |
[INFO] [stdout] 768 |             tree.insert(1, &2);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 768 |             let _ = tree.insert(1, &2);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:769:13
[INFO] [stdout]     |
[INFO] [stdout] 769 |             tree.insert(5, &3);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 769 |             let _ = tree.insert(5, &3);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:770:13
[INFO] [stdout]     |
[INFO] [stdout] 770 |             tree.insert(20, &4);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 770 |             let _ = tree.insert(20, &4);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:771:13
[INFO] [stdout]     |
[INFO] [stdout] 771 |             tree.insert(25, &5);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 771 |             let _ = tree.insert(25, &5);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:772:13
[INFO] [stdout]     |
[INFO] [stdout] 772 |             tree.insert(30, &5);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 772 |             let _ = tree.insert(30, &5);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:773:13
[INFO] [stdout]     |
[INFO] [stdout] 773 |             tree.insert(40, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 773 |             let _ = tree.insert(40, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:774:13
[INFO] [stdout]     |
[INFO] [stdout] 774 |             tree.insert(8, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 774 |             let _ = tree.insert(8, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:775:13
[INFO] [stdout]     |
[INFO] [stdout] 775 |             tree.insert(9, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 775 |             let _ = tree.insert(9, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:776:13
[INFO] [stdout]     |
[INFO] [stdout] 776 |             tree.insert(50, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 776 |             let _ = tree.insert(50, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:777:13
[INFO] [stdout]     |
[INFO] [stdout] 777 |             tree.insert(60, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 777 |             let _ = tree.insert(60, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:807:13
[INFO] [stdout]     |
[INFO] [stdout] 807 |             tree.insert(10, &2);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 807 |             let _ = tree.insert(10, &2);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:808:13
[INFO] [stdout]     |
[INFO] [stdout] 808 |             tree.insert(3, &1);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 808 |             let _ = tree.insert(3, &1);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:809:13
[INFO] [stdout]     |
[INFO] [stdout] 809 |             tree.insert(1, &2);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 809 |             let _ = tree.insert(1, &2);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:810:13
[INFO] [stdout]     |
[INFO] [stdout] 810 |             tree.insert(5, &3);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 810 |             let _ = tree.insert(5, &3);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:811:13
[INFO] [stdout]     |
[INFO] [stdout] 811 |             tree.insert(20, &4);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 811 |             let _ = tree.insert(20, &4);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:812:13
[INFO] [stdout]     |
[INFO] [stdout] 812 |             tree.insert(25, &5);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 812 |             let _ = tree.insert(25, &5);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:813:13
[INFO] [stdout]     |
[INFO] [stdout] 813 |             tree.insert(30, &5);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 813 |             let _ = tree.insert(30, &5);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:814:13
[INFO] [stdout]     |
[INFO] [stdout] 814 |             tree.insert(40, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 814 |             let _ = tree.insert(40, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:815:13
[INFO] [stdout]     |
[INFO] [stdout] 815 |             tree.insert(8, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 815 |             let _ = tree.insert(8, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:816:13
[INFO] [stdout]     |
[INFO] [stdout] 816 |             tree.insert(9, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 816 |             let _ = tree.insert(9, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:817:13
[INFO] [stdout]     |
[INFO] [stdout] 817 |             tree.insert(50, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 817 |             let _ = tree.insert(50, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:818:13
[INFO] [stdout]     |
[INFO] [stdout] 818 |             tree.insert(60, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 818 |             let _ = tree.insert(60, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:836:13
[INFO] [stdout]     |
[INFO] [stdout] 836 |             tree.insert(10, &2);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 836 |             let _ = tree.insert(10, &2);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:837:13
[INFO] [stdout]     |
[INFO] [stdout] 837 |             tree.remove(10);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 837 |             let _ = tree.remove(10);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:840:13
[INFO] [stdout]     |
[INFO] [stdout] 840 |             tree.insert(10, &2);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 840 |             let _ = tree.insert(10, &2);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:841:13
[INFO] [stdout]     |
[INFO] [stdout] 841 |             tree.insert(3, &1);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 841 |             let _ = tree.insert(3, &1);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:842:13
[INFO] [stdout]     |
[INFO] [stdout] 842 |             tree.remove(10);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 842 |             let _ = tree.remove(10);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:847:13
[INFO] [stdout]     |
[INFO] [stdout] 847 |             tree.insert(1, &2);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 847 |             let _ = tree.insert(1, &2);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:848:13
[INFO] [stdout]     |
[INFO] [stdout] 848 |             tree.insert(5, &3);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 848 |             let _ = tree.insert(5, &3);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:849:13
[INFO] [stdout]     |
[INFO] [stdout] 849 |             tree.insert(20, &4);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 849 |             let _ = tree.insert(20, &4);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:850:13
[INFO] [stdout]     |
[INFO] [stdout] 850 |             tree.insert(25, &5);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 850 |             let _ = tree.insert(25, &5);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:851:13
[INFO] [stdout]     |
[INFO] [stdout] 851 |             tree.insert(30, &5);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 851 |             let _ = tree.insert(30, &5);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:852:13
[INFO] [stdout]     |
[INFO] [stdout] 852 |             tree.insert(40, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 852 |             let _ = tree.insert(40, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:853:13
[INFO] [stdout]     |
[INFO] [stdout] 853 |             tree.insert(8, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 853 |             let _ = tree.insert(8, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:854:13
[INFO] [stdout]     |
[INFO] [stdout] 854 |             tree.insert(9, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 854 |             let _ = tree.insert(9, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:855:13
[INFO] [stdout]     |
[INFO] [stdout] 855 |             tree.insert(50, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 855 |             let _ = tree.insert(50, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:856:13
[INFO] [stdout]     |
[INFO] [stdout] 856 |             tree.insert(60, &6);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 856 |             let _ = tree.insert(60, &6);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:869:13
[INFO] [stdout]     |
[INFO] [stdout] 869 |             tree.remove(20);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 869 |             let _ = tree.remove(20);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:915:13
[INFO] [stdout]     |
[INFO] [stdout] 915 |             tree.remove(40);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 915 |             let _ = tree.remove(40);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:959:13
[INFO] [stdout]     |
[INFO] [stdout] 959 |             tree.remove(1);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 959 |             let _ = tree.remove(1);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:998:13
[INFO] [stdout]     |
[INFO] [stdout] 998 |             tree.remove(9);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 998 |             let _ = tree.remove(9);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1034:13
[INFO] [stdout]      |
[INFO] [stdout] 1034 |             tree.insert(10, &2);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1034 |             let _ = tree.insert(10, &2);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1035:13
[INFO] [stdout]      |
[INFO] [stdout] 1035 |             tree.insert(3, &1);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1035 |             let _ = tree.insert(3, &1);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1036:13
[INFO] [stdout]      |
[INFO] [stdout] 1036 |             tree.insert(1, &2);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1036 |             let _ = tree.insert(1, &2);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1037:13
[INFO] [stdout]      |
[INFO] [stdout] 1037 |             tree.insert(5, &3);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1037 |             let _ = tree.insert(5, &3);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1038:13
[INFO] [stdout]      |
[INFO] [stdout] 1038 |             tree.insert(20, &4);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1038 |             let _ = tree.insert(20, &4);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1039:13
[INFO] [stdout]      |
[INFO] [stdout] 1039 |             tree.insert(25, &5);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1039 |             let _ = tree.insert(25, &5);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1040:13
[INFO] [stdout]      |
[INFO] [stdout] 1040 |             tree.insert(30, &5);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1040 |             let _ = tree.insert(30, &5);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1041:13
[INFO] [stdout]      |
[INFO] [stdout] 1041 |             tree.insert(40, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1041 |             let _ = tree.insert(40, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1042:13
[INFO] [stdout]      |
[INFO] [stdout] 1042 |             tree.insert(8, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1042 |             let _ = tree.insert(8, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1043:13
[INFO] [stdout]      |
[INFO] [stdout] 1043 |             tree.insert(9, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1043 |             let _ = tree.insert(9, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1044:13
[INFO] [stdout]      |
[INFO] [stdout] 1044 |             tree.insert(50, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1044 |             let _ = tree.insert(50, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1045:13
[INFO] [stdout]      |
[INFO] [stdout] 1045 |             tree.insert(60, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1045 |             let _ = tree.insert(60, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1063:13
[INFO] [stdout]      |
[INFO] [stdout] 1063 |             tree.remove(20);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1063 |             let _ = tree.remove(20);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1117:13
[INFO] [stdout]      |
[INFO] [stdout] 1117 |             tree.insert(10, &2);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1117 |             let _ = tree.insert(10, &2);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1118:13
[INFO] [stdout]      |
[INFO] [stdout] 1118 |             tree.insert(3, &1);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1118 |             let _ = tree.insert(3, &1);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1119:13
[INFO] [stdout]      |
[INFO] [stdout] 1119 |             tree.insert(1, &2);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1119 |             let _ = tree.insert(1, &2);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1120:13
[INFO] [stdout]      |
[INFO] [stdout] 1120 |             tree.insert(5, &3);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1120 |             let _ = tree.insert(5, &3);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1121:13
[INFO] [stdout]      |
[INFO] [stdout] 1121 |             tree.insert(20, &4);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1121 |             let _ = tree.insert(20, &4);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1122:13
[INFO] [stdout]      |
[INFO] [stdout] 1122 |             tree.insert(25, &5);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1122 |             let _ = tree.insert(25, &5);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1123:13
[INFO] [stdout]      |
[INFO] [stdout] 1123 |             tree.insert(30, &5);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1123 |             let _ = tree.insert(30, &5);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1124:13
[INFO] [stdout]      |
[INFO] [stdout] 1124 |             tree.insert(40, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1124 |             let _ = tree.insert(40, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1125:13
[INFO] [stdout]      |
[INFO] [stdout] 1125 |             tree.insert(8, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1125 |             let _ = tree.insert(8, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1126:13
[INFO] [stdout]      |
[INFO] [stdout] 1126 |             tree.insert(9, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1126 |             let _ = tree.insert(9, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1127:13
[INFO] [stdout]      |
[INFO] [stdout] 1127 |             tree.insert(50, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1127 |             let _ = tree.insert(50, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1128:13
[INFO] [stdout]      |
[INFO] [stdout] 1128 |             tree.insert(60, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1128 |             let _ = tree.insert(60, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1129:13
[INFO] [stdout]      |
[INFO] [stdout] 1129 |             tree.insert(19, &6);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1129 |             let _ = tree.insert(19, &6);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1147:13
[INFO] [stdout]      |
[INFO] [stdout] 1147 |             tree.remove(20);
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1147 |             let _ = tree.remove(20);
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.58s
[INFO] running `Command { std: "docker" "inspect" "74f197563fa63294985b5a1cb014cba51b2b0a649d357fcf51397345fe05a561", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74f197563fa63294985b5a1cb014cba51b2b0a649d357fcf51397345fe05a561", kill_on_drop: false }`
[INFO] [stdout] 74f197563fa63294985b5a1cb014cba51b2b0a649d357fcf51397345fe05a561
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Copt-level=3" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+733b47ea4b1b86216f14ef56e49440c33933f230" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 8ec48f702bed8369d15bdb60f8449f4ec2441531da66ffc346c3ff6501c3bc4b
[INFO] running `Command { std: "docker" "start" "-a" "8ec48f702bed8369d15bdb60f8449f4ec2441531da66ffc346c3ff6501c3bc4b", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `Display`
[INFO] [stderr]  --> src/main.rs:3:41
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::fmt::{Debug, Formatter, Error, Display};
[INFO] [stderr]   |                                         ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:247:13
[INFO] [stderr]     |
[INFO] [stderr] 247 |         let mut node = 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: unnecessary `unsafe` block
[INFO] [stderr]    --> src/main.rs:323:21
[INFO] [stderr]     |
[INFO] [stderr] 321 |             unsafe {
[INFO] [stderr]     |             ------ because it's nested under this `unsafe` block
[INFO] [stderr] 322 |                 if (*current_node_ptr).key == key {
[INFO] [stderr] 323 |                     unsafe { (*current_node_ptr).value = value as *const V as *mut V };
[INFO] [stderr]     |                     ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:313:17
[INFO] [stderr]     |
[INFO] [stderr] 313 |             let mut root: *mut RBNode<K, V> = Box::into_raw(Box::from(RBNode::new(key, value)));
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `fixup_node` is never read
[INFO] [stderr]    --> src/main.rs:370:21
[INFO] [stderr]     |
[INFO] [stderr] 370 |             let mut fixup_node: Option<*mut RBNode<K, V>> = None;
[INFO] [stderr]     |                     ^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:372:21
[INFO] [stderr]     |
[INFO] [stderr] 372 |                 let mut right_node = (*remove_node).right;
[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/main.rs:410:21
[INFO] [stderr]     |
[INFO] [stderr] 410 |                 let mut left_node = (*remove_node).left;
[INFO] [stderr]     |                     ----^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/main.rs:762:28
[INFO] [stderr]     |
[INFO] [stderr] 758 |         unsafe {
[INFO] [stderr]     |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 762 |             assert_eq!(10, unsafe { (*node).key });
[INFO] [stderr]     |                            ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/main.rs:766:27
[INFO] [stderr]     |
[INFO] [stderr] 758 |         unsafe {
[INFO] [stderr]     |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 766 |             assert_eq!(3, unsafe { (*node).key });
[INFO] [stderr]     |                           ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/main.rs:779:27
[INFO] [stderr]     |
[INFO] [stderr] 758 |         unsafe {
[INFO] [stderr]     |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 779 |             assert_eq!(1, unsafe { (*node).key });
[INFO] [stderr]     |                           ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/main.rs:783:27
[INFO] [stderr]     |
[INFO] [stderr] 758 |         unsafe {
[INFO] [stderr]     |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 783 |             assert_eq!(5, unsafe { (*node).key });
[INFO] [stderr]     |                           ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/main.rs:787:28
[INFO] [stderr]     |
[INFO] [stderr] 758 |         unsafe {
[INFO] [stderr]     |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 787 |             assert_eq!(20, unsafe { (*node).key });
[INFO] [stderr]     |                            ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/main.rs:791:28
[INFO] [stderr]     |
[INFO] [stderr] 758 |         unsafe {
[INFO] [stderr]     |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 791 |             assert_eq!(30, unsafe { (*node).key });
[INFO] [stderr]     |                            ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/main.rs:795:28
[INFO] [stderr]     |
[INFO] [stderr] 758 |         unsafe {
[INFO] [stderr]     |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 795 |             assert_eq!(50, unsafe { (*node).key });
[INFO] [stderr]     |                            ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/main.rs:802:9
[INFO] [stderr]     |
[INFO] [stderr] 802 |         unsafe {
[INFO] [stderr]     |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1152:49
[INFO] [stderr]      |
[INFO] [stderr] 834  |         unsafe {
[INFO] [stderr]      |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1152 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).key }, unsafe { (*tree.root.unwrap()).color });
[INFO] [stderr]      |                                                 ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1152:87
[INFO] [stderr]      |
[INFO] [stderr] 834  |         unsafe {
[INFO] [stderr]      |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1152 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).key }, unsafe { (*tree.root.unwrap()).color });
[INFO] [stderr]      |                                                                                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1156:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1156 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().key }, unsafe { (*tree.root.unwrap()).left()...
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1156:103
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1156 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().key }, unsafe { (*tree.root.unwrap()).left()...
[INFO] [stderr]      |                                                                                                     ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1160:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1160 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().key }, unsafe { (*tree.root.unwrap()).right...
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1160:104
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1160 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().key }, unsafe { (*tree.root.unwrap()).right...
[INFO] [stderr]      |                                                                                                      ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1164:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1164 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().left().unwrap().key }, unsafe { (*tree.root....
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1164:119
[INFO] [stderr]      |
[INFO] [stderr] 834  |         unsafe {
[INFO] [stderr]      |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1164 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().left().unwrap().key }, unsafe { (*tree.roo...
[INFO] [stderr]      |                                                                                                                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1168:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1168 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().key }, unsafe { (*tree.root...
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1168:120
[INFO] [stderr]      |
[INFO] [stderr] 834  |         unsafe {
[INFO] [stderr]      |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1168 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().key }, unsafe { (*tree.ro...
[INFO] [stderr]      |                                                                                                                        ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1172:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1172 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().left().unwrap().key }, unsafe { (*tree.root...
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1172:120
[INFO] [stderr]      |
[INFO] [stderr] 834  |         unsafe {
[INFO] [stderr]      |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1172 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().left().unwrap().key }, unsafe { (*tree.ro...
[INFO] [stderr]      |                                                                                                                        ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1176:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1176 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().key }, unsafe { (*tree.roo...
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1176:121
[INFO] [stderr]      |
[INFO] [stderr] 834  |         unsafe {
[INFO] [stderr]      |         ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1176 |             println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().key }, unsafe { (*tree.r...
[INFO] [stderr]      |                                                                                                                         ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1180:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1180 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().left().unwrap().key }, unsa...
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1180:136
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1180 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().left().unwrap().key }, unsafe { ...
[INFO] [stderr]      |                                                                                                                                      ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1184:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1184 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().right().unwrap().key }, uns...
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1184:137
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1184 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).left().unwrap().right().unwrap().right().unwrap().key }, unsafe { ...
[INFO] [stderr]      |                                                                                                                                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1188:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1188 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().left().unwrap().key }, uns...
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1188:137
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1188 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().left().unwrap().key }, unsafe { ...
[INFO] [stderr]      |                                                                                                                                       ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1192:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1192 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().right().unwrap().key }, un...
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1192:138
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1192 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().right().unwrap().key }, unsafe { ...
[INFO] [stderr]      |                                                                                                                                        ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1196:49
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1196 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().right().unwrap().right().u...
[INFO] [stderr]      |                                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]     --> src/main.rs:1196:155
[INFO] [stderr]      |
[INFO] [stderr] 834  | ...   unsafe {
[INFO] [stderr]      |       ------ because it's nested under this `unsafe` block
[INFO] [stderr] ...
[INFO] [stderr] 1196 | ...       println!("key: {:#?}, color: {:?}", unsafe { (*tree.root.unwrap()).right().unwrap().right().unwrap().right().unwrap().right().unwrap().key }, unsafe { ...
[INFO] [stderr]      |                                                                                                                                                         ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr] 
[INFO] [stderr] warning: method `pair` is never used
[INFO] [stderr]   --> src/main.rs:34:8
[INFO] [stderr]    |
[INFO] [stderr] 32 | impl<K: Ord + Clone + Debug, V> RBNode<K, V> {
[INFO] [stderr]    | -------------------------------------------- method in this implementation
[INFO] [stderr] 33 |     #[inline]
[INFO] [stderr] 34 |     fn pair(self) -> (K, *mut V) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: multiple methods are never used
[INFO] [stderr]    --> src/main.rs:95:8
[INFO] [stderr]     |
[INFO] [stderr] 78  | impl<K: Ord + Clone + Debug, V> RBNode<K, V> {
[INFO] [stderr]     | -------------------------------------------- methods in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 95  |     fn is_node(&self) -> bool { !self.leaf }
[INFO] [stderr]     |        ^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 103 |     fn set_red_color(&mut self) {
[INFO] [stderr]     |        ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 108 |     fn set_black_color(&mut self) {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 113 |     fn get_color(&mut self) {
[INFO] [stderr]     |        ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 123 |     fn parent_is_red(&self) -> bool {
[INFO] [stderr]     |        ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 137 |     fn parent_is_black(&self) -> bool {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 207 |     fn prev(&self) -> Option<RBNode<K, V>> {
[INFO] [stderr]     |        ^^^^
[INFO] [stderr] ...
[INFO] [stderr] 229 |     fn max_node(&self) -> RBNode<K, V> {
[INFO] [stderr]     |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     tree.insert(10, &2);
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let _ = tree.insert(10, &2);
[INFO] [stderr]   |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     tree.insert(3, &1);
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let _ = tree.insert(3, &1);
[INFO] [stderr]   |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     tree.insert(1, &2);
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let _ = tree.insert(1, &2);
[INFO] [stderr]   |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:724:9
[INFO] [stderr]     |
[INFO] [stderr] 724 |         tree.insert(10, &2);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 724 |         let _ = tree.insert(10, &2);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:725:9
[INFO] [stderr]     |
[INFO] [stderr] 725 |         tree.insert(3, &1);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 725 |         let _ = tree.insert(3, &1);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:726:9
[INFO] [stderr]     |
[INFO] [stderr] 726 |         tree.insert(1, &2);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 726 |         let _ = tree.insert(1, &2);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:727:9
[INFO] [stderr]     |
[INFO] [stderr] 727 |         tree.insert(5, &3);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 727 |         let _ = tree.insert(5, &3);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:728:9
[INFO] [stderr]     |
[INFO] [stderr] 728 |         tree.insert(20, &4);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 728 |         let _ = tree.insert(20, &4);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:729:9
[INFO] [stderr]     |
[INFO] [stderr] 729 |         tree.insert(25, &5);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 729 |         let _ = tree.insert(25, &5);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:730:9
[INFO] [stderr]     |
[INFO] [stderr] 730 |         tree.insert(30, &5);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 730 |         let _ = tree.insert(30, &5);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:731:9
[INFO] [stderr]     |
[INFO] [stderr] 731 |         tree.insert(40, &6);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 731 |         let _ = tree.insert(40, &6);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:732:9
[INFO] [stderr]     |
[INFO] [stderr] 732 |         tree.insert(8, &6);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 732 |         let _ = tree.insert(8, &6);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:733:9
[INFO] [stderr]     |
[INFO] [stderr] 733 |         tree.insert(9, &6);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 733 |         let _ = tree.insert(9, &6);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:734:9
[INFO] [stderr]     |
[INFO] [stderr] 734 |         tree.insert(50, &6);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 734 |         let _ = tree.insert(50, &6);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:735:9
[INFO] [stderr]     |
[INFO] [stderr] 735 |         tree.insert(60, &6);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 735 |         let _ = tree.insert(60, &6);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:760:13
[INFO] [stderr]     |
[INFO] [stderr] 760 |             tree.insert(10, &2);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 760 |             let _ = tree.insert(10, &2);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:764:13
[INFO] [stderr]     |
[INFO] [stderr] 764 |             tree.insert(3, &1);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 764 |             let _ = tree.insert(3, &1);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:768:13
[INFO] [stderr]     |
[INFO] [stderr] 768 |             tree.insert(1, &2);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 768 |             let _ = tree.insert(1, &2);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:769:13
[INFO] [stderr]     |
[INFO] [stderr] 769 |             tree.insert(5, &3);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 769 |             let _ = tree.insert(5, &3);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:770:13
[INFO] [stderr]     |
[INFO] [stderr] 770 |             tree.insert(20, &4);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 770 |             let _ = tree.insert(20, &4);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:771:13
[INFO] [stderr]     |
[INFO] [stderr] 771 |             tree.insert(25, &5);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 771 |             let _ = tree.insert(25, &5);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:772:13
[INFO] [stderr]     |
[INFO] [stderr] 772 |             tree.insert(30, &5);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 772 |             let _ = tree.insert(30, &5);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:773:13
[INFO] [stderr]     |
[INFO] [stderr] 773 |             tree.insert(40, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 773 |             let _ = tree.insert(40, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:774:13
[INFO] [stderr]     |
[INFO] [stderr] 774 |             tree.insert(8, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 774 |             let _ = tree.insert(8, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:775:13
[INFO] [stderr]     |
[INFO] [stderr] 775 |             tree.insert(9, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 775 |             let _ = tree.insert(9, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:776:13
[INFO] [stderr]     |
[INFO] [stderr] 776 |             tree.insert(50, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 776 |             let _ = tree.insert(50, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:777:13
[INFO] [stderr]     |
[INFO] [stderr] 777 |             tree.insert(60, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 777 |             let _ = tree.insert(60, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:807:13
[INFO] [stderr]     |
[INFO] [stderr] 807 |             tree.insert(10, &2);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 807 |             let _ = tree.insert(10, &2);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:808:13
[INFO] [stderr]     |
[INFO] [stderr] 808 |             tree.insert(3, &1);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 808 |             let _ = tree.insert(3, &1);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:809:13
[INFO] [stderr]     |
[INFO] [stderr] 809 |             tree.insert(1, &2);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 809 |             let _ = tree.insert(1, &2);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:810:13
[INFO] [stderr]     |
[INFO] [stderr] 810 |             tree.insert(5, &3);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 810 |             let _ = tree.insert(5, &3);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:811:13
[INFO] [stderr]     |
[INFO] [stderr] 811 |             tree.insert(20, &4);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 811 |             let _ = tree.insert(20, &4);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:812:13
[INFO] [stderr]     |
[INFO] [stderr] 812 |             tree.insert(25, &5);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 812 |             let _ = tree.insert(25, &5);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:813:13
[INFO] [stderr]     |
[INFO] [stderr] 813 |             tree.insert(30, &5);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 813 |             let _ = tree.insert(30, &5);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:814:13
[INFO] [stderr]     |
[INFO] [stderr] 814 |             tree.insert(40, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 814 |             let _ = tree.insert(40, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:815:13
[INFO] [stderr]     |
[INFO] [stderr] 815 |             tree.insert(8, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 815 |             let _ = tree.insert(8, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:816:13
[INFO] [stderr]     |
[INFO] [stderr] 816 |             tree.insert(9, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 816 |             let _ = tree.insert(9, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:817:13
[INFO] [stderr]     |
[INFO] [stderr] 817 |             tree.insert(50, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 817 |             let _ = tree.insert(50, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:818:13
[INFO] [stderr]     |
[INFO] [stderr] 818 |             tree.insert(60, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 818 |             let _ = tree.insert(60, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:836:13
[INFO] [stderr]     |
[INFO] [stderr] 836 |             tree.insert(10, &2);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 836 |             let _ = tree.insert(10, &2);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:837:13
[INFO] [stderr]     |
[INFO] [stderr] 837 |             tree.remove(10);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 837 |             let _ = tree.remove(10);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:840:13
[INFO] [stderr]     |
[INFO] [stderr] 840 |             tree.insert(10, &2);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 840 |             let _ = tree.insert(10, &2);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:841:13
[INFO] [stderr]     |
[INFO] [stderr] 841 |             tree.insert(3, &1);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 841 |             let _ = tree.insert(3, &1);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:842:13
[INFO] [stderr]     |
[INFO] [stderr] 842 |             tree.remove(10);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 842 |             let _ = tree.remove(10);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:847:13
[INFO] [stderr]     |
[INFO] [stderr] 847 |             tree.insert(1, &2);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 847 |             let _ = tree.insert(1, &2);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:848:13
[INFO] [stderr]     |
[INFO] [stderr] 848 |             tree.insert(5, &3);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 848 |             let _ = tree.insert(5, &3);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:849:13
[INFO] [stderr]     |
[INFO] [stderr] 849 |             tree.insert(20, &4);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 849 |             let _ = tree.insert(20, &4);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:850:13
[INFO] [stderr]     |
[INFO] [stderr] 850 |             tree.insert(25, &5);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 850 |             let _ = tree.insert(25, &5);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:851:13
[INFO] [stderr]     |
[INFO] [stderr] 851 |             tree.insert(30, &5);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 851 |             let _ = tree.insert(30, &5);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:852:13
[INFO] [stderr]     |
[INFO] [stderr] 852 |             tree.insert(40, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 852 |             let _ = tree.insert(40, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:853:13
[INFO] [stderr]     |
[INFO] [stderr] 853 |             tree.insert(8, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 853 |             let _ = tree.insert(8, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:854:13
[INFO] [stderr]     |
[INFO] [stderr] 854 |             tree.insert(9, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 854 |             let _ = tree.insert(9, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:855:13
[INFO] [stderr]     |
[INFO] [stderr] 855 |             tree.insert(50, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 855 |             let _ = tree.insert(50, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:856:13
[INFO] [stderr]     |
[INFO] [stderr] 856 |             tree.insert(60, &6);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 856 |             let _ = tree.insert(60, &6);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:869:13
[INFO] [stderr]     |
[INFO] [stderr] 869 |             tree.remove(20);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 869 |             let _ = tree.remove(20);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:915:13
[INFO] [stderr]     |
[INFO] [stderr] 915 |             tree.remove(40);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 915 |             let _ = tree.remove(40);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:959:13
[INFO] [stderr]     |
[INFO] [stderr] 959 |             tree.remove(1);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 959 |             let _ = tree.remove(1);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:998:13
[INFO] [stderr]     |
[INFO] [stderr] 998 |             tree.remove(9);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 998 |             let _ = tree.remove(9);
[INFO] [stderr]     |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1034:13
[INFO] [stderr]      |
[INFO] [stderr] 1034 |             tree.insert(10, &2);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1034 |             let _ = tree.insert(10, &2);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1035:13
[INFO] [stderr]      |
[INFO] [stderr] 1035 |             tree.insert(3, &1);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1035 |             let _ = tree.insert(3, &1);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1036:13
[INFO] [stderr]      |
[INFO] [stderr] 1036 |             tree.insert(1, &2);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1036 |             let _ = tree.insert(1, &2);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1037:13
[INFO] [stderr]      |
[INFO] [stderr] 1037 |             tree.insert(5, &3);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1037 |             let _ = tree.insert(5, &3);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stdout] running 5 tests
[INFO] [stderr]     --> src/main.rs:1038:13
[INFO] [stderr]      |
[INFO] [stderr] 1038 |             tree.insert(20, &4);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1038 |             let _ = tree.insert(20, &4);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1039:13
[INFO] [stderr]      |
[INFO] [stderr] 1039 |             tree.insert(25, &5);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1039 |             let _ = tree.insert(25, &5);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1040:13
[INFO] [stderr]      |
[INFO] [stderr] 1040 |             tree.insert(30, &5);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1040 |             let _ = tree.insert(30, &5);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1041:13
[INFO] [stdout] test tests::insert ... ok
[INFO] [stderr]      |
[INFO] [stdout] test tests::len ... ok
[INFO] [stderr] 1041 |             tree.insert(40, &6);
[INFO] [stdout] test tests::find ... ok
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] test tests::find_minimum ... ok
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1041 |             let _ = tree.insert(40, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1042:13
[INFO] [stderr]      |
[INFO] [stderr] 1042 |             tree.insert(8, &6);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1042 |             let _ = tree.insert(8, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1043:13
[INFO] [stderr]      |
[INFO] [stderr] 1043 |             tree.insert(9, &6);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1043 |             let _ = tree.insert(9, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1044:13
[INFO] [stderr]      |
[INFO] [stderr] 1044 |             tree.insert(50, &6);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1044 |             let _ = tree.insert(50, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1045:13
[INFO] [stderr]      |
[INFO] [stderr] 1045 |             tree.insert(60, &6);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1045 |             let _ = tree.insert(60, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1063:13
[INFO] [stderr]      |
[INFO] [stderr] 1063 |             tree.remove(20);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1063 |             let _ = tree.remove(20);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1117:13
[INFO] [stderr]      |
[INFO] [stderr] 1117 |             tree.insert(10, &2);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1117 |             let _ = tree.insert(10, &2);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1118:13
[INFO] [stderr]      |
[INFO] [stderr] 1118 |             tree.insert(3, &1);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1118 |             let _ = tree.insert(3, &1);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1119:13
[INFO] [stderr]      |
[INFO] [stderr] 1119 |             tree.insert(1, &2);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1119 |             let _ = tree.insert(1, &2);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1120:13
[INFO] [stderr]      |
[INFO] [stderr] 1120 |             tree.insert(5, &3);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1120 |             let _ = tree.insert(5, &3);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1121:13
[INFO] [stderr]      |
[INFO] [stderr] 1121 |             tree.insert(20, &4);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1121 |             let _ = tree.insert(20, &4);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1122:13
[INFO] [stderr]      |
[INFO] [stderr] 1122 |             tree.insert(25, &5);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1122 |             let _ = tree.insert(25, &5);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1123:13
[INFO] [stderr]      |
[INFO] [stderr] 1123 |             tree.insert(30, &5);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1123 |             let _ = tree.insert(30, &5);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1124:13
[INFO] [stderr]      |
[INFO] [stderr] 1124 |             tree.insert(40, &6);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1124 |             let _ = tree.insert(40, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1125:13
[INFO] [stderr]      |
[INFO] [stderr] 1125 |             tree.insert(8, &6);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1125 |             let _ = tree.insert(8, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1126:13
[INFO] [stderr]      |
[INFO] [stderr] 1126 |             tree.insert(9, &6);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1126 |             let _ = tree.insert(9, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1127:13
[INFO] [stderr]      |
[INFO] [stderr] 1127 |             tree.insert(50, &6);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1127 |             let _ = tree.insert(50, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1128:13
[INFO] [stderr]      |
[INFO] [stderr] 1128 |             tree.insert(60, &6);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1128 |             let _ = tree.insert(60, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1129:13
[INFO] [stderr]      |
[INFO] [stderr] 1129 |             tree.insert(19, &6);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1129 |             let _ = tree.insert(19, &6);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]     --> src/main.rs:1147:13
[INFO] [stderr]      |
[INFO] [stderr] 1147 |             tree.remove(20);
[INFO] [stderr]      |             ^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 1147 |             let _ = tree.remove(20);
[INFO] [stderr]      |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `rb-tree` (bin "rb-tree" test) generated 126 warnings (run `cargo fix --bin "rb-tree" --tests` to apply 5 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.10s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rb_tree-c495e28547fd1235)
[INFO] [stdout] test tests::remove ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- tests::remove stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'tests::remove' panicked at src/main.rs:969:13:
[INFO] [stdout] assertion `left == right` failed
[INFO] [stdout]   left: 8
[INFO] [stdout]  right: 3
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x646053cfd9e2 - std::backtrace_rs::backtrace::libunwind::trace::h73a647620bf1c49d
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x646053cfd9e2 - std::backtrace_rs::backtrace::trace_unsynchronized::hd4d513ed96cb3cb1
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x646053cfd9e2 - std::sys::backtrace::_print_fmt::h61bb95f7476aafa5
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/sys/backtrace.rs:66:9
[INFO] [stdout]    3:     0x646053cfd9e2 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::ha2e7e3a01df69042
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/sys/backtrace.rs:39:26
[INFO] [stdout]    4:     0x646053d22ad3 - core::fmt::rt::Argument::fmt::hf14163372f0f9a76
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/fmt/rt.rs:173:76
[INFO] [stdout]    5:     0x646053d22ad3 - core::fmt::write::h7cb8f63788cd01d2
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/fmt/mod.rs:1465:25
[INFO] [stdout]    6:     0x646053cfa973 - std::io::default_write_fmt::h9ed739ccee8a150c
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x646053cfa973 - std::io::Write::write_fmt::h1c0a32da913b32f1
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/io/mod.rs:1954:13
[INFO] [stdout]    8:     0x646053cfd832 - std::sys::backtrace::BacktraceLock::print::h3ec4d7883eb25e61
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/sys/backtrace.rs:42:9
[INFO] [stdout]    9:     0x646053cfef4c - std::panicking::default_hook::{{closure}}::h29548987efd832cb
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panicking.rs:300:27
[INFO] [stdout]   10:     0x646053cfeda2 - std::panicking::default_hook::ha25170a15c643514
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panicking.rs:324:9
[INFO] [stdout]   11:     0x646053cc6ec4 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h562adeecbf43c420
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/alloc/src/boxed.rs:1985:9
[INFO] [stdout]   12:     0x646053cc6ec4 - test::test_main_with_exit_callback::{{closure}}::h97dd2a879d27e0e4
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x646053cff92b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h7e85cbdbda26fdb7
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/alloc/src/boxed.rs:1985:9
[INFO] [stdout]   14:     0x646053cff92b - std::panicking::rust_panic_with_hook::h0d81afcd829aa24b
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panicking.rs:841:13
[INFO] [stdout]   15:     0x646053cff6fa - std::panicking::begin_panic_handler::{{closure}}::hc84a33f1202346cf
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panicking.rs:706:13
[INFO] [stdout]   16:     0x646053cfded9 - std::sys::backtrace::__rust_end_short_backtrace::h373067a14f6c59aa
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/sys/backtrace.rs:168:18
[INFO] [stdout]   17:     0x646053cff38d - __rustc[beb0385846a06d21]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panicking.rs:697:5
[INFO] [stdout]   18:     0x646053d21620 - core::panicking::panic_fmt::ha33fa2ae772efba9
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/panicking.rs:75:14
[INFO] [stdout]   19:     0x646053d218b7 - core::panicking::assert_failed_inner::h6a89cd271393c011
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/panicking.rs:448:17
[INFO] [stdout]   20:     0x646053d21809 - core::panicking::assert_failed::h20563a97be4f023a
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/panicking.rs:403:5
[INFO] [stdout]   21:     0x646053c8b023 - rb_tree::tests::remove::h0654f79b213444ab
[INFO] [stdout]   22:     0x646053c8c4d9 - rb_tree::tests::remove::{{closure}}::h495372557e26588e
[INFO] [stdout]                                at /opt/rustwide/workdir/src/main.rs:833:16
[INFO] [stdout]   23:     0x646053c8c4d9 - core::ops::function::FnOnce::call_once::h836bac5d79888472
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x646053ccc5fb - core::ops::function::FnOnce::call_once::hf84b9c3d864a6959
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x646053ccc5fb - test::__rust_begin_short_backtrace::h5724e31441c16fcb
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/test/src/lib.rs:648:18
[INFO] [stdout]   26:     0x646053ccb83e - test::run_test_in_process::{{closure}}::hbc28c9aa91793d7d
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/test/src/lib.rs:671:74
[INFO] [stdout]   27:     0x646053ccb83e - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hc17b0e238c0f8f3e
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   28:     0x646053ccb83e - std::panicking::catch_unwind::do_call::hcdbce0d6dd6c83ce
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panicking.rs:589:40
[INFO] [stdout]   29:     0x646053ccb83e - std::panicking::catch_unwind::h9477967ceea044e8
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panicking.rs:552:19
[INFO] [stdout]   30:     0x646053ccb83e - std::panic::catch_unwind::h616a2e249da12e16
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x646053ccb83e - test::run_test_in_process::h2758deb0f2e54430
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/test/src/lib.rs:671:27
[INFO] [stdout]   32:     0x646053ccb83e - test::run_test::{{closure}}::habe5cd2564b18aaa
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/test/src/lib.rs:592:43
[INFO] [stdout]   33:     0x646053c8f3e4 - test::run_test::{{closure}}::h9a0a6928f1a15421
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/test/src/lib.rs:622:41
[INFO] [stdout]   34:     0x646053c8f3e4 - std::sys::backtrace::__rust_begin_short_backtrace::hd68b5332434a22ca
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/sys/backtrace.rs:152:18
[INFO] [stdout]   35:     0x646053c92d8a - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h264ddcc3098eacae
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/thread/mod.rs:559:17
[INFO] [stdout]   36:     0x646053c92d8a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h9fa39489749d6f3c
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stderr] error: test failed, to rerun pass `--bin rb-tree`
[INFO] [stdout]   37:     0x646053c92d8a - std::panicking::catch_unwind::do_call::hb9a1944b9f85100f
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panicking.rs:589:40
[INFO] [stdout]   38:     0x646053c92d8a - std::panicking::catch_unwind::h0c6f100786c0dad8
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panicking.rs:552:19
[INFO] [stdout]   39:     0x646053c92d8a - std::panic::catch_unwind::hf6084e2723385823
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x646053c92d8a - std::thread::Builder::spawn_unchecked_::{{closure}}::hf0af58ce658143ad
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/thread/mod.rs:557:30
[INFO] [stdout]   41:     0x646053c92d8a - core::ops::function::FnOnce::call_once{{vtable.shim}}::h88a14f9b2e79f9de
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x646053d02887 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf31256ba38644b65
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/alloc/src/boxed.rs:1971:9
[INFO] [stdout]   43:     0x646053d02887 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h100ad77f3448041b
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/alloc/src/boxed.rs:1971:9
[INFO] [stdout]   44:     0x646053d02887 - std::sys::pal::unix::thread::Thread::new::thread_start::h1a22ded422ce395b
[INFO] [stdout]                                at /rustc/733b47ea4b1b86216f14ef56e49440c33933f230/library/std/src/sys/pal/unix/thread.rs:97:17
[INFO] [stdout]   45:     0x7fb2e6994aa4 - <unknown>
[INFO] [stdout]   46:     0x7fb2e6a21a34 - clone
[INFO] [stdout]   47:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     tests::remove
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 4 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.06s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "8ec48f702bed8369d15bdb60f8449f4ec2441531da66ffc346c3ff6501c3bc4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ec48f702bed8369d15bdb60f8449f4ec2441531da66ffc346c3ff6501c3bc4b", kill_on_drop: false }`
[INFO] [stdout] 8ec48f702bed8369d15bdb60f8449f4ec2441531da66ffc346c3ff6501c3bc4b
