[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#d98a5da813da67eb189387b8ccfb73cf481275d8+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-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/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-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Hagi013/toy-rb-tree on toolchain d98a5da813da67eb189387b8ccfb73cf481275d8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "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" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 74e234cd9c439681cdc28fdf5a6ad3c78dc109b644b9116e904f42be3e637a12
[INFO] running `Command { std: "docker" "start" "-a" "74e234cd9c439681cdc28fdf5a6ad3c78dc109b644b9116e904f42be3e637a12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "74e234cd9c439681cdc28fdf5a6ad3c78dc109b644b9116e904f42be3e637a12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74e234cd9c439681cdc28fdf5a6ad3c78dc109b644b9116e904f42be3e637a12", kill_on_drop: false }`
[INFO] [stdout] 74e234cd9c439681cdc28fdf5a6ad3c78dc109b644b9116e904f42be3e637a12
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -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" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8c66cb10da098e066a65d856112d51b10da1a1664891f8bc1412ca4fbcad96c7
[INFO] running `Command { std: "docker" "start" "-a" "8c66cb10da098e066a65d856112d51b10da1a1664891f8bc1412ca4fbcad96c7", 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 0.58s
[INFO] running `Command { std: "docker" "inspect" "8c66cb10da098e066a65d856112d51b10da1a1664891f8bc1412ca4fbcad96c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c66cb10da098e066a65d856112d51b10da1a1664891f8bc1412ca4fbcad96c7", kill_on_drop: false }`
[INFO] [stdout] 8c66cb10da098e066a65d856112d51b10da1a1664891f8bc1412ca4fbcad96c7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -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" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 26c1aa55d5734b8371dd75c5dc89f087fc097b4b9c9ee01f5ece610ac36f69d0
[INFO] running `Command { std: "docker" "start" "-a" "26c1aa55d5734b8371dd75c5dc89f087fc097b4b9c9ee01f5ece610ac36f69d0", 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 1.56s
[INFO] running `Command { std: "docker" "inspect" "26c1aa55d5734b8371dd75c5dc89f087fc097b4b9c9ee01f5ece610ac36f69d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26c1aa55d5734b8371dd75c5dc89f087fc097b4b9c9ee01f5ece610ac36f69d0", kill_on_drop: false }`
[INFO] [stdout] 26c1aa55d5734b8371dd75c5dc89f087fc097b4b9c9ee01f5ece610ac36f69d0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -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" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9f96b15933bb3a14ba4450a4dfb998f8581ec9d6cf4368e20bd47bc0a5e9d21a
[INFO] running `Command { std: "docker" "start" "-a" "9f96b15933bb3a14ba4450a4dfb998f8581ec9d6cf4368e20bd47bc0a5e9d21a", 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] [stdout] 
[INFO] [stderr] 837 |             tree.remove(10);
[INFO] [stdout] running 5 tests
[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] [stdout] test tests::find ... ok
[INFO] [stderr] 1034 |             let _ = tree.insert(10, &2);
[INFO] [stdout] test tests::find_minimum ... ok
[INFO] [stderr]      |             +++++++
[INFO] [stdout] test tests::len ... ok
[INFO] [stderr] 
[INFO] [stdout] test tests::insert ... ok
[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] [stderr] warning: unused `Result` that must be used
[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] [stderr]      |
[INFO] [stderr] 1041 |             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] 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 0.07s
[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:     0x5c718cab2a22 - std::backtrace_rs::backtrace::libunwind::trace::hd39b1f53d3cf9745
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x5c718cab2a22 - std::backtrace_rs::backtrace::trace_unsynchronized::he91d9a75d4e3972b
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x5c718cab2a22 - std::sys::backtrace::_print_fmt::hca46938f8c6e22cf
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/sys/backtrace.rs:66:9
[INFO] [stdout]    3:     0x5c718cab2a22 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::ha499add612cccf8e
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/sys/backtrace.rs:39:26
[INFO] [stdout]    4:     0x5c718cad7ae3 - core::fmt::rt::Argument::fmt::hd21145b75a833b7a
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/core/src/fmt/rt.rs:173:76
[INFO] [stdout]    5:     0x5c718cad7ae3 - core::fmt::write::hb10c956f5235c8a4
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/core/src/fmt/mod.rs:1465:25
[INFO] [stdout]    6:     0x5c718caafc03 - std::io::default_write_fmt::hdb7615052be2ba4d
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x5c718caafc03 - std::io::Write::write_fmt::he1bcd251ec6e4153
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/io/mod.rs:1954:13
[INFO] [stdout]    8:     0x5c718cab2872 - std::sys::backtrace::BacktraceLock::print::hb47c770ef659fd10
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/sys/backtrace.rs:42:9
[INFO] [stdout]    9:     0x5c718cab3f8c - std::panicking::default_hook::{{closure}}::hdda8afb9d457a22c
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panicking.rs:300:27
[INFO] [stdout]   10:     0x5c718cab3de2 - std::panicking::default_hook::h7c46b44874fe5c9a
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panicking.rs:324:9
[INFO] [stdout]   11:     0x5c718ca7bec4 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h178a5fcedee41e2f
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/alloc/src/boxed.rs:1985:9
[INFO] [stdout]   12:     0x5c718ca7bec4 - test::test_main_with_exit_callback::{{closure}}::h951a41e0149d6d5d
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x5c718cab496b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h13602080f5b63276
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/alloc/src/boxed.rs:1985:9
[INFO] [stdout]   14:     0x5c718cab496b - std::panicking::rust_panic_with_hook::ha6cb99ed099eb1c5
[INFO] [stderr] error: test failed, to rerun pass `--bin rb-tree`
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panicking.rs:841:13
[INFO] [stdout]   15:     0x5c718cab473a - std::panicking::begin_panic_handler::{{closure}}::he11808bc797ee921
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panicking.rs:706:13
[INFO] [stdout]   16:     0x5c718cab2f19 - std::sys::backtrace::__rust_end_short_backtrace::h9418807cb7346258
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/sys/backtrace.rs:168:18
[INFO] [stdout]   17:     0x5c718cab43cd - __rustc[18fb429eef004894]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panicking.rs:697:5
[INFO] [stdout]   18:     0x5c718cad6630 - core::panicking::panic_fmt::hd890aeb12c3a3fc3
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/core/src/panicking.rs:75:14
[INFO] [stdout]   19:     0x5c718cad68c7 - core::panicking::assert_failed_inner::h02e1528dd7bc6647
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/core/src/panicking.rs:448:17
[INFO] [stdout]   20:     0x5c718cad67e9 - core::panicking::assert_failed::h24b207bf351b573a
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/core/src/panicking.rs:403:5
[INFO] [stdout]   21:     0x5c718ca40023 - rb_tree::tests::remove::hd0b3582fbf9fb1c0
[INFO] [stdout]   22:     0x5c718ca414d9 - rb_tree::tests::remove::{{closure}}::haa96923c21156640
[INFO] [stdout]                                at /opt/rustwide/workdir/src/main.rs:833:16
[INFO] [stdout]   23:     0x5c718ca414d9 - core::ops::function::FnOnce::call_once::hab0dd4b4ed0b39f2
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x5c718ca8164b - core::ops::function::FnOnce::call_once::h2869fb5b0a2b0bdc
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x5c718ca8164b - test::__rust_begin_short_backtrace::h7dd7142bd62fa711
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/test/src/lib.rs:648:18
[INFO] [stdout]   26:     0x5c718ca8083e - test::run_test_in_process::{{closure}}::h43a753f038d36b3f
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/test/src/lib.rs:671:74
[INFO] [stdout]   27:     0x5c718ca8083e - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h0ca95dd3e12d1e16
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   28:     0x5c718ca8083e - std::panicking::catch_unwind::do_call::he308587d70ac34ba
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panicking.rs:589:40
[INFO] [stdout]   29:     0x5c718ca8083e - std::panicking::catch_unwind::h30dcba31973e8fb0
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panicking.rs:552:19
[INFO] [stdout]   30:     0x5c718ca8083e - std::panic::catch_unwind::hfb68364e5621fbee
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x5c718ca8083e - test::run_test_in_process::hcdcc2977903b998a
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/test/src/lib.rs:671:27
[INFO] [stdout]   32:     0x5c718ca8083e - test::run_test::{{closure}}::h544a6550958c5d14
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/test/src/lib.rs:592:43
[INFO] [stdout]   33:     0x5c718ca443b4 - test::run_test::{{closure}}::hb172e48ebe2b92c7
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/test/src/lib.rs:622:41
[INFO] [stdout]   34:     0x5c718ca443b4 - std::sys::backtrace::__rust_begin_short_backtrace::h7e79d8706638bea0
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/sys/backtrace.rs:152:18
[INFO] [stdout]   35:     0x5c718ca47d8a - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::hc4a275f1e71b8ab0
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/thread/mod.rs:559:17
[INFO] [stdout]   36:     0x5c718ca47d8a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h01ed0d242df78cfd
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   37:     0x5c718ca47d8a - std::panicking::catch_unwind::do_call::h052f373fb905fee0
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panicking.rs:589:40
[INFO] [stdout]   38:     0x5c718ca47d8a - std::panicking::catch_unwind::hb425d20c8ffb09c8
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panicking.rs:552:19
[INFO] [stdout]   39:     0x5c718ca47d8a - std::panic::catch_unwind::ha0d5dfbf18fdeda5
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x5c718ca47d8a - std::thread::Builder::spawn_unchecked_::{{closure}}::hbe79182bd37949c7
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/thread/mod.rs:557:30
[INFO] [stdout]   41:     0x5c718ca47d8a - core::ops::function::FnOnce::call_once{{vtable.shim}}::hc096c4a06972fde5
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x5c718cab78c7 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h47377e27fb938a26
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/alloc/src/boxed.rs:1971:9
[INFO] [stdout]   43:     0x5c718cab78c7 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h72f1fe5d095abf57
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/alloc/src/boxed.rs:1971:9
[INFO] [stdout]   44:     0x5c718cab78c7 - std::sys::pal::unix::thread::Thread::new::thread_start::h0a4d8e1b9c0d38cf
[INFO] [stdout]                                at /rustc/d98a5da813da67eb189387b8ccfb73cf481275d8/library/std/src/sys/pal/unix/thread.rs:97:17
[INFO] [stdout]   45:     0x77d06001aaa4 - <unknown>
[INFO] [stdout]   46:     0x77d0600a7a34 - 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 0.04s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "9f96b15933bb3a14ba4450a4dfb998f8581ec9d6cf4368e20bd47bc0a5e9d21a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f96b15933bb3a14ba4450a4dfb998f8581ec9d6cf4368e20bd47bc0a5e9d21a", kill_on_drop: false }`
[INFO] [stdout] 9f96b15933bb3a14ba4450a4dfb998f8581ec9d6cf4368e20bd47bc0a5e9d21a
