[INFO] cloning repository https://github.com/EstebanBorai/data-structures-and-algorithms-with-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EstebanBorai/data-structures-and-algorithms-with-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEstebanBorai%2Fdata-structures-and-algorithms-with-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEstebanBorai%2Fdata-structures-and-algorithms-with-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9c734424fb3b1f5bc653cae252adfd2eda119768
[INFO] checking EstebanBorai/data-structures-and-algorithms-with-rust against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEstebanBorai%2Fdata-structures-and-algorithms-with-rust" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EstebanBorai/data-structures-and-algorithms-with-rust on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/EstebanBorai/data-structures-and-algorithms-with-rust
[INFO] finished tweaking git repo https://github.com/EstebanBorai/data-structures-and-algorithms-with-rust
[INFO] tweaked toml for git repo https://github.com/EstebanBorai/data-structures-and-algorithms-with-rust written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/EstebanBorai/data-structures-and-algorithms-with-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f4281d3d6fd7a54a4e7d76dd463efbd96af3e46174b69ec895a970ab50137116
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f4281d3d6fd7a54a4e7d76dd463efbd96af3e46174b69ec895a970ab50137116", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f4281d3d6fd7a54a4e7d76dd463efbd96af3e46174b69ec895a970ab50137116", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4281d3d6fd7a54a4e7d76dd463efbd96af3e46174b69ec895a970ab50137116", kill_on_drop: false }`
[INFO] [stdout] f4281d3d6fd7a54a4e7d76dd463efbd96af3e46174b69ec895a970ab50137116
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d12c93709db9320d3f354fcf4ea259c4606ff0efde89f567b48fc873718095e9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d12c93709db9320d3f354fcf4ea259c4606ff0efde89f567b48fc873718095e9", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking getrandom v0.2.2
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking dsa-in-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/binary_search_tree.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn new(value: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `boxed`
[INFO] [stdout]   --> src/binary_search_tree.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 |     pub fn boxed(value: T) -> Box<Self> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> src/binary_search_tree.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn peek(&self) -> &T {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/binary_search_tree.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 52 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add`
[INFO] [stdout]   --> src/binary_search_tree.rs:60:12
[INFO] [stdout]    |
[INFO] [stdout] 60 |     pub fn add(&mut self, value: T) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_recursive`
[INFO] [stdout]   --> src/binary_search_tree.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn add_recursive(&mut self, node: Tree<T>, value: T) -> Tree<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `find`
[INFO] [stdout]   --> src/binary_search_tree.rs:90:12
[INFO] [stdout]    |
[INFO] [stdout] 90 |     pub fn find(&self, value: T) -> Option<T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `find_recursive`
[INFO] [stdout]   --> src/binary_search_tree.rs:96:8
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn find_recursive(&self, node: &Tree<T>, value: T) -> Option<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `walk`
[INFO] [stdout]    --> src/binary_search_tree.rs:109:12
[INFO] [stdout]     |
[INFO] [stdout] 109 |     pub fn walk(&self, func: impl Fn(&T) -> ()) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `walk_in_order`
[INFO] [stdout]    --> src/binary_search_tree.rs:113:8
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn walk_in_order(&self, node: &Tree<T>, func: &impl Fn(&T) -> ()) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/doubly_linked_list.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn new(value: T) -> Rc<RefCell<Self>> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_value`
[INFO] [stdout]   --> src/doubly_linked_list.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn peek_value(&self) -> &T {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/doubly_linked_list.rs:58:12
[INFO] [stdout]    |
[INFO] [stdout] 58 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `len`
[INFO] [stdout]   --> src/doubly_linked_list.rs:67:12
[INFO] [stdout]    |
[INFO] [stdout] 67 |     pub fn len(&self) -> u32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/doubly_linked_list.rs:72:12
[INFO] [stdout]    |
[INFO] [stdout] 72 |     pub fn append(&mut self, value: T) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/doubly_linked_list.rs:90:12
[INFO] [stdout]    |
[INFO] [stdout] 90 |     pub fn pop(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/doubly_linked_list.rs:120:8
[INFO] [stdout]     |
[INFO] [stdout] 120 |     fn new(current: Link<T>) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `DynamicArray`
[INFO] [stdout]   --> src/dynamic_array.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct DynamicArray<T: Clone> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/dynamic_array.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: `grow`
[INFO] [stdout]   --> src/dynamic_array.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn grow(&mut self, min_cap: usize) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `ensure_capacity`
[INFO] [stdout]   --> src/dynamic_array.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn ensure_capacity(&mut self, items_to_add: usize) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `item_at`
[INFO] [stdout]   --> src/dynamic_array.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 52 |     pub fn item_at(&mut self, index: usize) -> Option<T> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add`
[INFO] [stdout]   --> src/dynamic_array.rs:60:12
[INFO] [stdout]    |
[INFO] [stdout] 60 |     pub fn add(&mut self, value: T) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/singly_linked_list.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn new(value: T) -> Rc<RefCell<Self>> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_value`
[INFO] [stdout]   --> src/singly_linked_list.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn peek_value(&self) -> &T {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/singly_linked_list.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `len`
[INFO] [stdout]   --> src/singly_linked_list.rs:58:12
[INFO] [stdout]    |
[INFO] [stdout] 58 |     pub fn len(&self) -> u32 {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/singly_linked_list.rs:63:12
[INFO] [stdout]    |
[INFO] [stdout] 63 |     pub fn append(&mut self, value: T) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/singly_linked_list.rs:76:12
[INFO] [stdout]    |
[INFO] [stdout] 76 |     pub fn pop(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/skip_list.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn new(level: usize, value: T) -> Rc<RefCell<Self>> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek_value`
[INFO] [stdout]   --> src/skip_list.rs:39:12
[INFO] [stdout]    |
[INFO] [stdout] 39 |     pub fn peek_value(&self) -> &T {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/skip_list.rs:56:12
[INFO] [stdout]    |
[INFO] [stdout] 56 |     pub fn new(max_level: usize) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/skip_list.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub fn append(&mut self, value: T) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_level`
[INFO] [stdout]   --> src/skip_list.rs:96:8
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn get_level(&self) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: bounds on generic parameters are not enforced in type aliases
[INFO] [stdout]  --> src/binary_search_tree.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 | type Tree<T: std::cmp::Ord + std::fmt::Debug + Clone> = Option<Box<Node<T>>>;
[INFO] [stdout]   |              ^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^   ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(type_alias_bounds)]` on by default
[INFO] [stdout] help: the bound will not be checked when the type alias is used, and should be removed
[INFO] [stdout]   |
[INFO] [stdout] 9 | type Tree<T> = Option<Box<Node<T>>>;
[INFO] [stdout]   |           --
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 35 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> src/binary_search_tree.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |     pub fn peek(&self) -> &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: `peek_value`
[INFO] [stdout]   --> src/skip_list.rs:39:12
[INFO] [stdout]    |
[INFO] [stdout] 39 |     pub fn peek_value(&self) -> &T {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: bounds on generic parameters are not enforced in type aliases
[INFO] [stdout]  --> src/binary_search_tree.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 | type Tree<T: std::cmp::Ord + std::fmt::Debug + Clone> = Option<Box<Node<T>>>;
[INFO] [stdout]   |              ^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^   ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(type_alias_bounds)]` on by default
[INFO] [stdout] help: the bound will not be checked when the type alias is used, and should be removed
[INFO] [stdout]   |
[INFO] [stdout] 9 | type Tree<T> = Option<Box<Node<T>>>;
[INFO] [stdout]   |           --
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.16s
[INFO] running `Command { std: "docker" "inspect" "d12c93709db9320d3f354fcf4ea259c4606ff0efde89f567b48fc873718095e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d12c93709db9320d3f354fcf4ea259c4606ff0efde89f567b48fc873718095e9", kill_on_drop: false }`
[INFO] [stdout] d12c93709db9320d3f354fcf4ea259c4606ff0efde89f567b48fc873718095e9