[INFO] cloning repository https://github.com/ickshonpe/rust-data-structures
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ickshonpe/rust-data-structures" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fickshonpe%2Frust-data-structures", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fickshonpe%2Frust-data-structures'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] af0bf8f5e24687dad2a324e4518931fdbad50590
[INFO] testing ickshonpe/rust-data-structures against try#ecabaf78506b7a4668d42dc20268c086b93f0fad for pr-87041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fickshonpe%2Frust-data-structures" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ickshonpe/rust-data-structures on toolchain ecabaf78506b7a4668d42dc20268c086b93f0fad
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ickshonpe/rust-data-structures
[INFO] finished tweaking git repo https://github.com/ickshonpe/rust-data-structures
[INFO] tweaked toml for git repo https://github.com/ickshonpe/rust-data-structures written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/ickshonpe/rust-data-structures already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded futures v0.1.14
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fe1868e070501b9da4105ef1708dc7aba42d274bd43f6320b7b1adf7da6afefc
[INFO] running `Command { std: "docker" "start" "-a" "fe1868e070501b9da4105ef1708dc7aba42d274bd43f6320b7b1adf7da6afefc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fe1868e070501b9da4105ef1708dc7aba42d274bd43f6320b7b1adf7da6afefc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe1868e070501b9da4105ef1708dc7aba42d274bd43f6320b7b1adf7da6afefc", kill_on_drop: false }`
[INFO] [stdout] fe1868e070501b9da4105ef1708dc7aba42d274bd43f6320b7b1adf7da6afefc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69c0b4bebefd8a28c9c5e76dfdd74a67dc39cc8e2f43aef607d333d9c354f445
[INFO] running `Command { std: "docker" "start" "-a" "69c0b4bebefd8a28c9c5e76dfdd74a67dc39cc8e2f43aef607d333d9c354f445", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.29
[INFO] [stderr]    Compiling either v1.1.0
[INFO] [stderr]    Compiling scopeguard v0.3.2
[INFO] [stderr]    Compiling futures v0.1.14
[INFO] [stderr]    Compiling rayon-core v1.2.1
[INFO] [stderr]    Compiling coco v0.1.1
[INFO] [stderr]    Compiling rand v0.3.16
[INFO] [stderr]    Compiling num_cpus v1.6.2
[INFO] [stderr]    Compiling rayon v0.8.2
[INFO] [stderr]    Compiling data-structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/list.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `list::*`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use list::*;
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `merge_sort`
[INFO] [stdout]  --> src/merge_sort.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn merge_sort<T: PartialOrd + Copy>(xs: &[T]) -> Vec<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: `merge`
[INFO] [stdout]   --> src/merge_sort.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn merge<T: PartialOrd + Copy>(mut left: &[T], mut right: &[T]) -> Vec<T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `id`
[INFO] [stdout]  --> src/tricks.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn id<T>(x: T) -> T {
[INFO] [stdout]   |        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Link`
[INFO] [stdout]  --> src/list.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Link<T> = Option<Box<Node<T>>>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `back`
[INFO] [stdout]   --> src/list.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fn back(&mut self) -> &mut Link<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `back_id`
[INFO] [stdout]   --> src/list.rs:77:8
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn back_id(&mut self) -> &mut Link<T> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `back_tmp`
[INFO] [stdout]   --> src/list.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 87 |     fn back_tmp(&mut self) -> &mut Link<T> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `quick_sort`
[INFO] [stdout]  --> src/quick_sort_slice.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn quick_sort<T: PartialOrd>(data: &mut [T]) {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `partition`
[INFO] [stdout]   --> src/quick_sort_slice.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn partition<T: PartialOrd>(data: &mut [T]) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `example`
[INFO] [stdout]   --> src/quick_sort_slice.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn example() {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `quick_sort`
[INFO] [stdout]  --> src/parallel_quick_sort.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn quick_sort<T: PartialOrd + std::marker::Send>(data: &mut [T]) {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_exclusive_mut`
[INFO] [stdout]   --> src/parallel_quick_sort.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn split_at_exclusive_mut<T>(data: &mut [T], p: usize) -> (&mut [T], &mut [T]) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `partition`
[INFO] [stdout]   --> src/parallel_quick_sort.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn partition<T: PartialOrd>(data: &mut [T]) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `example`
[INFO] [stdout]   --> src/parallel_quick_sort.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn example() {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.37s
[INFO] running `Command { std: "docker" "inspect" "69c0b4bebefd8a28c9c5e76dfdd74a67dc39cc8e2f43aef607d333d9c354f445", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69c0b4bebefd8a28c9c5e76dfdd74a67dc39cc8e2f43aef607d333d9c354f445", kill_on_drop: false }`
[INFO] [stdout] 69c0b4bebefd8a28c9c5e76dfdd74a67dc39cc8e2f43aef607d333d9c354f445
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 03f2a82839df09dc1459481e1633113246c3a7f4bf9735a1506d68f16f47118f
[INFO] running `Command { std: "docker" "start" "-a" "03f2a82839df09dc1459481e1633113246c3a7f4bf9735a1506d68f16f47118f", kill_on_drop: false }`
[INFO] [stderr]    Compiling data-structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/list.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `list::*`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use list::*;
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/list.rs:239:17
[INFO] [stdout]     |
[INFO] [stdout] 239 |             let mut n = list.peek_mut().unwrap();
[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: function is never used: `merge_sort`
[INFO] [stdout]  --> src/merge_sort.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn merge_sort<T: PartialOrd + Copy>(xs: &[T]) -> Vec<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: `merge`
[INFO] [stdout]   --> src/merge_sort.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn merge<T: PartialOrd + Copy>(mut left: &[T], mut right: &[T]) -> Vec<T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `id`
[INFO] [stdout]  --> src/tricks.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn id<T>(x: T) -> T {
[INFO] [stdout]   |        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Link`
[INFO] [stdout]  --> src/list.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | type Link<T> = Option<Box<Node<T>>>;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `back`
[INFO] [stdout]   --> src/list.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fn back(&mut self) -> &mut Link<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `back_id`
[INFO] [stdout]   --> src/list.rs:77:8
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn back_id(&mut self) -> &mut Link<T> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `back_tmp`
[INFO] [stdout]   --> src/list.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 87 |     fn back_tmp(&mut self) -> &mut Link<T> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `example`
[INFO] [stdout]   --> src/quick_sort_slice.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn example() {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `example`
[INFO] [stdout]   --> src/parallel_quick_sort.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn example() {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.99s
[INFO] running `Command { std: "docker" "inspect" "03f2a82839df09dc1459481e1633113246c3a7f4bf9735a1506d68f16f47118f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03f2a82839df09dc1459481e1633113246c3a7f4bf9735a1506d68f16f47118f", kill_on_drop: false }`
[INFO] [stdout] 03f2a82839df09dc1459481e1633113246c3a7f4bf9735a1506d68f16f47118f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 69419b23c9df8258f46d60fd648de518e96e080e754923480d7d379a169f817d
[INFO] running `Command { std: "docker" "start" "-a" "69419b23c9df8258f46d60fd648de518e96e080e754923480d7d379a169f817d", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/list.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `list::*`
[INFO] [stderr]   --> src/main.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use list::*;
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/list.rs:239:17
[INFO] [stderr]     |
[INFO] [stderr] 239 |             let mut n = list.peek_mut().unwrap();
[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: function is never used: `merge_sort`
[INFO] [stderr]  --> src/merge_sort.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn merge_sort<T: PartialOrd + Copy>(xs: &[T]) -> Vec<T> {
[INFO] [stderr]   |        ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `merge`
[INFO] [stderr]   --> src/merge_sort.rs:14:8
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub fn merge<T: PartialOrd + Copy>(mut left: &[T], mut right: &[T]) -> Vec<T> {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `id`
[INFO] [stderr]  --> src/tricks.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn id<T>(x: T) -> T {
[INFO] [stderr]   |        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Link`
[INFO] [stderr]  --> src/list.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | type Link<T> = Option<Box<Node<T>>>;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `back`
[INFO] [stderr]   --> src/list.rs:67:8
[INFO] [stderr]    |
[INFO] [stderr] 67 |     fn back(&mut self) -> &mut Link<T> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `back_id`
[INFO] [stderr]   --> src/list.rs:77:8
[INFO] [stderr]    |
[INFO] [stderr] 77 |     fn back_id(&mut self) -> &mut Link<T> {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `back_tmp`
[INFO] [stderr]   --> src/list.rs:87:8
[INFO] [stderr]    |
[INFO] [stderr] 87 |     fn back_tmp(&mut self) -> &mut Link<T> {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `example`
[INFO] [stderr]   --> src/quick_sort_slice.rs:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub fn example() {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `example`
[INFO] [stderr]   --> src/parallel_quick_sort.rs:39:8
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn example() {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/data_structures-3f831d38e6525fa8)
[INFO] [stdout] 
[INFO] [stdout] running 9 tests
[INFO] [stdout] test list::test_len ... ok
[INFO] [stderr] Rayon: detected unexpected panic; aborting
[INFO] [stderr] error: test failed, to rerun pass '--bin data-structures'
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/deps/data_structures-3f831d38e6525fa8` (signal: 6, SIGABRT: process abort signal)
[INFO] running `Command { std: "docker" "inspect" "69419b23c9df8258f46d60fd648de518e96e080e754923480d7d379a169f817d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69419b23c9df8258f46d60fd648de518e96e080e754923480d7d379a169f817d", kill_on_drop: false }`
[INFO] [stdout] 69419b23c9df8258f46d60fd648de518e96e080e754923480d7d379a169f817d