[INFO] cloning repository https://github.com/EstebanBorai/grokking-algorithms-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/grokking-algorithms-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEstebanBorai%2Fgrokking-algorithms-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEstebanBorai%2Fgrokking-algorithms-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 57048173fd1d063c4b76d36047ed51b746dcc19f
[INFO] checking EstebanBorai/grokking-algorithms-rust against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEstebanBorai%2Fgrokking-algorithms-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/grokking-algorithms-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/grokking-algorithms-rust
[INFO] finished tweaking git repo https://github.com/EstebanBorai/grokking-algorithms-rust
[INFO] tweaked toml for git repo https://github.com/EstebanBorai/grokking-algorithms-rust written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/EstebanBorai/grokking-algorithms-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] 2a815a8296dcdc928482190192b3060861a69d53d1908ee58933e135a58aedb7
[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" "2a815a8296dcdc928482190192b3060861a69d53d1908ee58933e135a58aedb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a815a8296dcdc928482190192b3060861a69d53d1908ee58933e135a58aedb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a815a8296dcdc928482190192b3060861a69d53d1908ee58933e135a58aedb7", kill_on_drop: false }`
[INFO] [stdout] 2a815a8296dcdc928482190192b3060861a69d53d1908ee58933e135a58aedb7
[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] 79a6b814341df324b2767d1630250e0fa16c1bbb7e73dd0c0a18e5027866b99b
[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" "79a6b814341df324b2767d1630250e0fa16c1bbb7e73dd0c0a18e5027866b99b", kill_on_drop: false }`
[INFO] [stderr]     Checking grokking-algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/dijkstras.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn new(name: &'a str) -> Node<'a> {
[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: `length`
[INFO] [stdout]   --> src/queue.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn length(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> src/queue.rs:52:12
[INFO] [stdout]    |
[INFO] [stdout] 52 |     pub fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/stack.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> src/stack.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub fn push(&mut self, element: T) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> src/stack.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn pop(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `length`
[INFO] [stdout]   --> src/stack.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 |     pub fn length(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> src/stack.rs:40:12
[INFO] [stdout]    |
[INFO] [stdout] 40 |     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/stack.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn is_empty(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.57s
[INFO] running `Command { std: "docker" "inspect" "79a6b814341df324b2767d1630250e0fa16c1bbb7e73dd0c0a18e5027866b99b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79a6b814341df324b2767d1630250e0fa16c1bbb7e73dd0c0a18e5027866b99b", kill_on_drop: false }`
[INFO] [stdout] 79a6b814341df324b2767d1630250e0fa16c1bbb7e73dd0c0a18e5027866b99b