[INFO] cloning repository https://github.com/Dominionys/algorithms
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Dominionys/algorithms" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDominionys%2Falgorithms", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDominionys%2Falgorithms'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b52144a9e104f1e2e2e232aab6dd5e6fd57e4ded
[INFO] checking Dominionys/algorithms against try#39e1293fce4b650061e85dda88aa428f726a8444 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDominionys%2Falgorithms" "/workspace/builds/worker-84/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-84/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Dominionys/algorithms on toolchain 39e1293fce4b650061e85dda88aa428f726a8444
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Dominionys/algorithms
[INFO] finished tweaking git repo https://github.com/Dominionys/algorithms
[INFO] tweaked toml for git repo https://github.com/Dominionys/algorithms written to /workspace/builds/worker-84/source/Cargo.toml
[INFO] crate git repo https://github.com/Dominionys/algorithms already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "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-84/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/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" "+39e1293fce4b650061e85dda88aa428f726a8444" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e57ed3befd48d4ca4e6ef53fbe83155cce6475629d81cb77c27dc642554bb371
[INFO] running `Command { std: "docker" "start" "-a" "e57ed3befd48d4ca4e6ef53fbe83155cce6475629d81cb77c27dc642554bb371", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e57ed3befd48d4ca4e6ef53fbe83155cce6475629d81cb77c27dc642554bb371", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e57ed3befd48d4ca4e6ef53fbe83155cce6475629d81cb77c27dc642554bb371", kill_on_drop: false }`
[INFO] [stdout] e57ed3befd48d4ca4e6ef53fbe83155cce6475629d81cb77c27dc642554bb371
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/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" "+39e1293fce4b650061e85dda88aa428f726a8444" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6fa2955fef357e105db488dae0ea98cafdc34708dea5662aa6f6c87cb2d7960b
[INFO] running `Command { std: "docker" "start" "-a" "6fa2955fef357e105db488dae0ea98cafdc34708dea5662aa6f6c87cb2d7960b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking sorting v0.1.0 (/opt/rustwide/workdir/sorting)
[INFO] [stderr]     Checking queues v0.1.0 (/opt/rustwide/workdir/queues)
[INFO] [stderr]     Checking tree v0.1.0 (/opt/rustwide/workdir/tree)
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]  --> queues/src/double_linked_list.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::Deref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Debug`, `Display`
[INFO] [stdout]  --> queues/src/linked_list.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Debug, Display};
[INFO] [stdout]   |                ^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deref`, `Index`
[INFO] [stdout]  --> queues/src/linked_list.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::{Deref, Index};
[INFO] [stdout]   |                ^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> queues/src/unsafe_queue.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::List`
[INFO] [stdout]   --> queues/src/unsafe_queue.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     use super::List;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `TreeNode`
[INFO] [stdout]  --> tree/src/tree.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct TreeNode<T> {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> tree/src/tree.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub fn new(value: T) -> Self {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push_back`
[INFO] [stdout]   --> tree/src/tree.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn push_back(&mut self, node: TreeNode<T>) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_child`
[INFO] [stdout]   --> tree/src/tree.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn pop_child(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sort`
[INFO] [stdout]  --> sorting/src/bubble.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn sort<T: PartialOrd>(arr: &mut [T]) {
[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`
[INFO] [stdout]  --> sorting/src/insertion.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn sort<T: PartialOrd>(arr: &mut [T]) {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `top_down_sort`
[INFO] [stdout]  --> sorting/src/merge.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn top_down_sort<T: PartialOrd>(arr: &mut [T]) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `top_down_merge`
[INFO] [stdout]   --> sorting/src/merge.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn top_down_merge<T: PartialOrd>(arr: &mut [T]) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `partition_lomuto`
[INFO] [stdout]  --> sorting/src/quicksort.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn partition_lomuto<T: PartialOrd>(arr: &mut [T], low: usize, high: usize) -> usize {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `quicksort_lomuto`
[INFO] [stdout]   --> sorting/src/quicksort.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn quicksort_lomuto<T: PartialOrd>(arr: &mut [T], low: usize, high: usize) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `partition_hoare`
[INFO] [stdout]   --> sorting/src/quicksort.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 63 | pub fn partition_hoare<T: PartialOrd>(arr: &mut [T], low: usize, high: usize) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `quicksort_hoare`
[INFO] [stdout]   --> sorting/src/quicksort.rs:94:8
[INFO] [stdout]    |
[INFO] [stdout] 94 | pub fn quicksort_hoare<T: PartialOrd>(arr: &mut [T], low: usize, high: usize) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sort`
[INFO] [stdout]  --> sorting/src/selection.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn sort<T: PartialOrd>(arr: &mut [T]) {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sort`
[INFO] [stdout]  --> sorting/src/shell.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn sort<T: PartialOrd>(arr: &mut [T]) {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `insertion_sort`
[INFO] [stdout]   --> sorting/src/shell.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn insertion_sort<T: PartialOrd>(arr: &mut [T], start: usize, gap: usize) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sort`
[INFO] [stdout]  --> sorting/src/slow.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn sort<T: PartialOrd>(arr: &mut [T]) {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `slow_sort`
[INFO] [stdout]  --> sorting/src/slow.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn slow_sort<T: PartialOrd>(i: usize, j: usize, arr: &mut [T]) {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]  --> queues/src/double_linked_list.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::Deref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Debug`, `Display`
[INFO] [stdout]  --> queues/src/linked_list.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Debug, Display};
[INFO] [stdout]   |                ^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `current_node`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:130:13
[INFO] [stdout]     |
[INFO] [stdout] 130 |         let current_node = self.head.as_ref().map(|node| node.borrow());
[INFO] [stdout]     |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_current_node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deref`, `Index`
[INFO] [stdout]  --> queues/src/linked_list.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::{Deref, Index};
[INFO] [stdout]   |                ^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]    --> queues/src/linked_list.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 201 |     use std::ops::Deref;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> queues/src/unsafe_queue.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Deque`
[INFO] [stdout]  --> queues/src/deque.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Deque<T> {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> queues/src/deque.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub fn new() -> Deque<T> {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_empty`
[INFO] [stdout]   --> queues/src/deque.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn is_empty(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> queues/src/deque.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn size(&self) -> usize {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `enqueue`
[INFO] [stdout]   --> queues/src/deque.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn enqueue(&mut self, element: T) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `enqueue_front`
[INFO] [stdout]   --> queues/src/deque.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn enqueue_front(&mut self, element: T) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `dequeue`
[INFO] [stdout]   --> queues/src/deque.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn dequeue(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `dequeue_front`
[INFO] [stdout]   --> queues/src/deque.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn dequeue_front(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> queues/src/deque.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_front`
[INFO] [stdout]   --> queues/src/deque.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn peek_front(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> queues/src/double_linked_list.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn new(element: T) -> Rc<RefCell<Self>> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> queues/src/double_linked_list.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push_front`
[INFO] [stdout]   --> queues/src/double_linked_list.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn push_front(&mut self, element: T) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_front`
[INFO] [stdout]   --> queues/src/double_linked_list.rs:68:12
[INFO] [stdout]    |
[INFO] [stdout] 68 |     pub fn peek_front(&self) -> Option<Ref<T>> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_front_mut`
[INFO] [stdout]   --> queues/src/double_linked_list.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn peek_front_mut(&self) -> Option<RefMut<T>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push_back`
[INFO] [stdout]   --> queues/src/double_linked_list.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 82 |     pub fn push_back(&mut self, element: T) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_back`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:115:12
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn peek_back(&self) -> Option<Ref<T>> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_back_mut`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:121:12
[INFO] [stdout]     |
[INFO] [stdout] 121 |     pub fn peek_back_mut(&self) -> Option<RefMut<T>> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `reverse`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:129:12
[INFO] [stdout]     |
[INFO] [stdout] 129 |     pub fn reverse(&mut self) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `into_iter`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:184:12
[INFO] [stdout]     |
[INFO] [stdout] 184 |     pub fn into_iter(self) -> IntoIter<T> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `next`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:204:5
[INFO] [stdout]     |
[INFO] [stdout] 204 |     next: Option<Ref<'a, Node<T>>>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:208:12
[INFO] [stdout]     |
[INFO] [stdout] 208 |     pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> queues/src/linked_list.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push_front`
[INFO] [stdout]   --> queues/src/linked_list.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn push_front(&mut self, element: T) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push_back`
[INFO] [stdout]   --> queues/src/linked_list.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn push_back(&mut self, element: T) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_back`
[INFO] [stdout]   --> queues/src/linked_list.rs:59:12
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub fn pop_back(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_front`
[INFO] [stdout]   --> queues/src/linked_list.rs:72:12
[INFO] [stdout]    |
[INFO] [stdout] 72 |     pub fn peek_front(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_front_mut`
[INFO] [stdout]   --> queues/src/linked_list.rs:76:12
[INFO] [stdout]    |
[INFO] [stdout] 76 |     pub fn peek_front_mut(&mut self) -> Option<&mut T> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_back`
[INFO] [stdout]   --> queues/src/linked_list.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 80 |     pub fn peek_back(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_back_mut`
[INFO] [stdout]   --> queues/src/linked_list.rs:84:12
[INFO] [stdout]    |
[INFO] [stdout] 84 |     pub fn peek_back_mut(&mut self) -> Option<&mut T> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `reverse`
[INFO] [stdout]   --> queues/src/linked_list.rs:90:12
[INFO] [stdout]    |
[INFO] [stdout] 90 |     pub fn reverse(&mut self) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove_by_index`
[INFO] [stdout]    --> queues/src/linked_list.rs:105:12
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub fn remove_by_index(&mut self, index: usize) -> Option<T> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `into_iter`
[INFO] [stdout]    --> queues/src/linked_list.rs:139:12
[INFO] [stdout]     |
[INFO] [stdout] 139 |     pub fn into_iter(self) -> IntoIter<T> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]    --> queues/src/linked_list.rs:157:12
[INFO] [stdout]     |
[INFO] [stdout] 157 |     pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter_mut`
[INFO] [stdout]    --> queues/src/linked_list.rs:180:12
[INFO] [stdout]     |
[INFO] [stdout] 180 |     pub fn iter_mut(&mut self) -> IterMut<T> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> queues/src/persistent_stack.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> queues/src/persistent_stack.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn append(&self, element: T) -> List<T> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> queues/src/persistent_stack.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn tail(&self) -> List<T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `head`
[INFO] [stdout]   --> queues/src/persistent_stack.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn head(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]   --> queues/src/persistent_stack.rs:57:12
[INFO] [stdout]    |
[INFO] [stdout] 57 |     pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> queues/src/queue.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub fn new() -> Queue<T> {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> queues/src/queue.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn size(&self) -> usize {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `enqueue`
[INFO] [stdout]   --> queues/src/queue.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn enqueue(&mut self, element: T) {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> queues/src/queue.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> queues/src/stack.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub fn new() -> Stack<T> {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_empty`
[INFO] [stdout]   --> queues/src/stack.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn is_empty(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> queues/src/stack.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn size(&self) -> usize {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> queues/src/stack.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn push(&mut self, element: T) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> queues/src/stack.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Link`
[INFO] [stdout]  --> queues/src/unsafe_queue.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Link<T> = Option<Box<Node<T>>>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `List`
[INFO] [stdout]  --> queues/src/unsafe_queue.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct List<T> {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Node`
[INFO] [stdout]   --> queues/src/unsafe_queue.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Node<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> queues/src/unsafe_queue.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> queues/src/unsafe_queue.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn push(&mut self, element: T) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> queues/src/unsafe_queue.rs:43:12
[INFO] [stdout]    |
[INFO] [stdout] 43 |     pub fn pop(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 61 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `current_node`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:130:13
[INFO] [stdout]     |
[INFO] [stdout] 130 |         let current_node = self.head.as_ref().map(|node| node.borrow());
[INFO] [stdout]     |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_current_node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `reverse`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:129:12
[INFO] [stdout]     |
[INFO] [stdout] 129 |     pub fn reverse(&mut self) {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `next`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:204:5
[INFO] [stdout]     |
[INFO] [stdout] 204 |     next: Option<Ref<'a, Node<T>>>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]    --> queues/src/double_linked_list.rs:208:12
[INFO] [stdout]     |
[INFO] [stdout] 208 |     pub fn iter(&self) -> Iter<T> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> queues/src/queue.rs:69:35
[INFO] [stdout]    |
[INFO] [stdout] 69 |         assert!(queue.is_empty(), true);
[INFO] [stdout]    |                                   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]    = note: this usage of panic!() is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 69 |         assert!(queue.is_empty(), "{}", true);
[INFO] [stdout]    |                                   +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.40s
[INFO] running `Command { std: "docker" "inspect" "6fa2955fef357e105db488dae0ea98cafdc34708dea5662aa6f6c87cb2d7960b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fa2955fef357e105db488dae0ea98cafdc34708dea5662aa6f6c87cb2d7960b", kill_on_drop: false }`
[INFO] [stdout] 6fa2955fef357e105db488dae0ea98cafdc34708dea5662aa6f6c87cb2d7960b