[INFO] cloning repository https://github.com/fa93hws/CLRS
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fa93hws/CLRS" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffa93hws%2FCLRS", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffa93hws%2FCLRS'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4769559c01ba94faca574f197aee351400f49abd
[INFO] checking fa93hws/CLRS against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffa93hws%2FCLRS" "/workspace/builds/worker-77/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-77/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fa93hws/CLRS on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/fa93hws/CLRS
[INFO] finished tweaking git repo https://github.com/fa93hws/CLRS
[INFO] tweaked toml for git repo https://github.com/fa93hws/CLRS written to /workspace/builds/worker-77/source/Cargo.toml
[INFO] crate git repo https://github.com/fa93hws/CLRS already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 57d7e7a45e0878e3fb8befa95d1f2a41e4705810ddcd12c529184829bf8cb8b9
[INFO] running `Command { std: "docker" "start" "-a" "57d7e7a45e0878e3fb8befa95d1f2a41e4705810ddcd12c529184829bf8cb8b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "57d7e7a45e0878e3fb8befa95d1f2a41e4705810ddcd12c529184829bf8cb8b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57d7e7a45e0878e3fb8befa95d1f2a41e4705810ddcd12c529184829bf8cb8b9", kill_on_drop: false }`
[INFO] [stdout] 57d7e7a45e0878e3fb8befa95d1f2a41e4705810ddcd12c529184829bf8cb8b9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cdad3c76f5780d73555a3d6f9ea329399ed9c50d983fa13d8fb47865b871a5f6
[INFO] running `Command { std: "docker" "start" "-a" "cdad3c76f5780d73555a3d6f9ea329399ed9c50d983fa13d8fb47865b871a5f6", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling libc v0.2.50
[INFO] [stderr]     Checking rand_jitter v0.1.3
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking clrs v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stdout] warning: function is never used: `sort`
[INFO] [stdout]  --> src/sort/quick_sort.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn sort(arr: &mut Vec<i32>) {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sort_rec`
[INFO] [stdout]  --> src/sort/quick_sort.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn sort_rec(arr: &mut Vec<i32>, begin: usize, end: usize) {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_max_subarray_rec`
[INFO] [stdout]    --> src/max_subarray/binary_search.rs:100:6
[INFO] [stdout]     |
[INFO] [stdout] 100 |   fn find_max_subarray_rec() {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:52:10
[INFO] [stdout]    |
[INFO] [stdout] 52 |   pub fn insert(&mut self, value: i32) {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sort`
[INFO] [stdout]  --> src/sort/quick_sort.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn sort(arr: &mut Vec<i32>) {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sort_rec`
[INFO] [stdout]  --> src/sort/quick_sort.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn sort_rec(arr: &mut Vec<i32>, begin: usize, end: usize) {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `partition`
[INFO] [stdout]   --> src/sort/quick_sort.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn partition(arr: &mut Vec<i32>, begin: usize, end: usize, pivot: usize) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `MaxHeap`
[INFO] [stdout]  --> src/my_collections/heap/array_heap.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct MaxHeap {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `panic_if_empty`
[INFO] [stdout]  --> src/my_collections/heap/array_heap.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn panic_if_empty(arr: &Vec<i32>) {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:12:10
[INFO] [stdout]    |
[INFO] [stdout] 12 |   pub fn new(arr: &Vec<i32>) -> Self {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:20:10
[INFO] [stdout]    |
[INFO] [stdout] 20 |   pub fn size(&self) -> usize { self.array.len() }
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_max`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:22:10
[INFO] [stdout]    |
[INFO] [stdout] 22 |   pub fn get_max(&self) -> i32 {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `extract_max`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:27:10
[INFO] [stdout]    |
[INFO] [stdout] 27 |   pub fn extract_max(&mut self) -> i32 {
[INFO] [stdout]    |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `increase_key`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:35:10
[INFO] [stdout]    |
[INFO] [stdout] 35 |   pub fn increase_key(&mut self, idx: usize, value: i32) {
[INFO] [stdout]    |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:52:10
[INFO] [stdout]    |
[INFO] [stdout] 52 |   pub fn insert(&mut self, value: i32) {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `delete`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:57:10
[INFO] [stdout]    |
[INFO] [stdout] 57 |   pub fn delete(&mut self, idx: usize) {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_parent`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn find_parent(idx: usize) -> usize { idx >> 1 }
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Stack`
[INFO] [stdout]  --> src/my_collections/stack.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct Stack<T> {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `capacity`
[INFO] [stdout]   --> src/my_collections/stack.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 |   pub fn capacity(&self) -> usize {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `with_capacity`
[INFO] [stdout]   --> src/my_collections/stack.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 |   pub fn with_capacity(capacity: usize) -> Self {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/my_collections/stack.rs:30:10
[INFO] [stdout]    |
[INFO] [stdout] 30 |   pub fn push(&mut self, item: T) {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/my_collections/stack.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |   pub fn pop(&mut self) -> Option<T> {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> src/my_collections/stack.rs:46:10
[INFO] [stdout]    |
[INFO] [stdout] 46 |   pub fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_empty`
[INFO] [stdout]   --> src/my_collections/stack.rs:56:10
[INFO] [stdout]    |
[INFO] [stdout] 56 |   pub fn is_empty(&self) -> bool {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_full`
[INFO] [stdout]   --> src/my_collections/stack.rs:60:10
[INFO] [stdout]    |
[INFO] [stdout] 60 |   pub fn is_full(&self) -> bool {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_n_smallest_in_vec`
[INFO] [stdout]  --> src/others/n_smallest/mod.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn find_n_smallest_in_vec(vec: &Vec<i32>, n: usize) -> Vec<i32> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 22 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 35.82s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Checking clrs v0.1.0 (/tmp/fixit)
[INFO] [stdout] warning: function is never used: `sort`
[INFO] [stdout]  --> src/sort/quick_sort.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn sort(arr: &mut Vec<i32>) {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sort_rec`
[INFO] [stdout]  --> src/sort/quick_sort.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn sort_rec(arr: &mut Vec<i32>, begin: usize, end: usize) {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `partition`
[INFO] [stdout]   --> src/sort/quick_sort.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn partition(arr: &mut Vec<i32>, begin: usize, end: usize, pivot: usize) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `MaxHeap`
[INFO] [stdout]  --> src/my_collections/heap/array_heap.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct MaxHeap {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `panic_if_empty`
[INFO] [stdout]  --> src/my_collections/heap/array_heap.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn panic_if_empty(arr: &Vec<i32>) {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:12:10
[INFO] [stdout]    |
[INFO] [stdout] 12 |   pub fn new(arr: &Vec<i32>) -> Self {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:20:10
[INFO] [stdout]    |
[INFO] [stdout] 20 |   pub fn size(&self) -> usize { self.array.len() }
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_max`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:22:10
[INFO] [stdout]    |
[INFO] [stdout] 22 |   pub fn get_max(&self) -> i32 {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `extract_max`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:27:10
[INFO] [stdout]    |
[INFO] [stdout] 27 |   pub fn extract_max(&mut self) -> i32 {
[INFO] [stdout]    |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `increase_key`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:35:10
[INFO] [stdout]    |
[INFO] [stdout] 35 |   pub fn increase_key(&mut self, idx: usize, value: i32) {
[INFO] [stdout]    |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:52:10
[INFO] [stdout]    |
[INFO] [stdout] 52 |   pub fn insert(&mut self, value: i32) {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `delete`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:57:10
[INFO] [stdout]    |
[INFO] [stdout] 57 |   pub fn delete(&mut self, idx: usize) {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_parent`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn find_parent(idx: usize) -> usize { idx >> 1 }
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Stack`
[INFO] [stdout]  --> src/my_collections/stack.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct Stack<T> {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `capacity`
[INFO] [stdout]   --> src/my_collections/stack.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 |   pub fn capacity(&self) -> usize {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `with_capacity`
[INFO] [stdout]   --> src/my_collections/stack.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 |   pub fn with_capacity(capacity: usize) -> Self {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/my_collections/stack.rs:30:10
[INFO] [stdout]    |
[INFO] [stdout] 30 |   pub fn push(&mut self, item: T) {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/my_collections/stack.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 |   pub fn pop(&mut self) -> Option<T> {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> src/my_collections/stack.rs:46:10
[INFO] [stdout]    |
[INFO] [stdout] 46 |   pub fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_empty`
[INFO] [stdout]   --> src/my_collections/stack.rs:56:10
[INFO] [stdout]    |
[INFO] [stdout] 56 |   pub fn is_empty(&self) -> bool {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_full`
[INFO] [stdout]   --> src/my_collections/stack.rs:60:10
[INFO] [stdout]    |
[INFO] [stdout] 60 |   pub fn is_full(&self) -> bool {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_n_smallest_in_vec`
[INFO] [stdout]  --> src/others/n_smallest/mod.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn find_n_smallest_in_vec(vec: &Vec<i32>, n: usize) -> Vec<i32> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 22 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sort`
[INFO] [stdout]  --> src/sort/quick_sort.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn sort(arr: &mut Vec<i32>) {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sort_rec`
[INFO] [stdout]  --> src/sort/quick_sort.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn sort_rec(arr: &mut Vec<i32>, begin: usize, end: usize) {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_max_subarray_rec`
[INFO] [stdout]    --> src/max_subarray/binary_search.rs:100:6
[INFO] [stdout]     |
[INFO] [stdout] 100 |   fn find_max_subarray_rec() {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/my_collections/heap/array_heap.rs:52:10
[INFO] [stdout]    |
[INFO] [stdout] 52 |   pub fn insert(&mut self, value: i32) {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "cdad3c76f5780d73555a3d6f9ea329399ed9c50d983fa13d8fb47865b871a5f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdad3c76f5780d73555a3d6f9ea329399ed9c50d983fa13d8fb47865b871a5f6", kill_on_drop: false }`
[INFO] [stdout] cdad3c76f5780d73555a3d6f9ea329399ed9c50d983fa13d8fb47865b871a5f6