[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] bf4eb38245d150a6c3b55f35648613b5f1d44da9
[INFO] checking EstebanBorai/data-structures-and-algorithms-with-rust against master#a5f164faad4a2fed606b8160fd7ecd2d5cbba381 for pr-84920
[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-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EstebanBorai/data-structures-and-algorithms-with-rust on toolchain a5f164faad4a2fed606b8160fd7ecd2d5cbba381
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "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-3/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" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 649223c6241096795dc9293ea64cd9d67405a67ae43fa4da7b9a0f002a4b6901
[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" "649223c6241096795dc9293ea64cd9d67405a67ae43fa4da7b9a0f002a4b6901", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "649223c6241096795dc9293ea64cd9d67405a67ae43fa4da7b9a0f002a4b6901", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "649223c6241096795dc9293ea64cd9d67405a67ae43fa4da7b9a0f002a4b6901", kill_on_drop: false }`
[INFO] [stdout] 649223c6241096795dc9293ea64cd9d67405a67ae43fa4da7b9a0f002a4b6901
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] db461c45ae4e93898390b264ef94f302627f8576118d10edc8322d0097a7da61
[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" "db461c45ae4e93898390b264ef94f302627f8576118d10edc8322d0097a7da61", kill_on_drop: false }`
[INFO] [stderr]     Checking dsa-in-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> src/doubly_linked_list.rs:176:9
[INFO] [stdout]     |
[INFO] [stdout] 176 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/singly_linked_list.rs:96:9
[INFO] [stdout]    |
[INFO] [stdout] 96 |     use super::*;
[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]    = note: `#[warn(dead_code)]` on by default
[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: 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: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.60s
[INFO] running `Command { std: "docker" "inspect" "db461c45ae4e93898390b264ef94f302627f8576118d10edc8322d0097a7da61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db461c45ae4e93898390b264ef94f302627f8576118d10edc8322d0097a7da61", kill_on_drop: false }`
[INFO] [stdout] db461c45ae4e93898390b264ef94f302627f8576118d10edc8322d0097a7da61