[INFO] cloning repository https://github.com/shivenigma/data-structures-algorithms
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shivenigma/data-structures-algorithms" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshivenigma%2Fdata-structures-algorithms", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshivenigma%2Fdata-structures-algorithms'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f28a6f363eed2e6320d497c7c6072a6f3feee124
[INFO] checking shivenigma/data-structures-algorithms against master#90442458ac46b1d5eed752c316da25450f67285b for pr-81477
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshivenigma%2Fdata-structures-algorithms" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shivenigma/data-structures-algorithms on toolchain 90442458ac46b1d5eed752c316da25450f67285b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/shivenigma/data-structures-algorithms
[INFO] finished tweaking git repo https://github.com/shivenigma/data-structures-algorithms
[INFO] tweaked toml for git repo https://github.com/shivenigma/data-structures-algorithms written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/shivenigma/data-structures-algorithms already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8ddb934a84c80abe562109f838821d2479f0c2d8bebe56e6f06e68217c5ed36f
[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" "8ddb934a84c80abe562109f838821d2479f0c2d8bebe56e6f06e68217c5ed36f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8ddb934a84c80abe562109f838821d2479f0c2d8bebe56e6f06e68217c5ed36f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ddb934a84c80abe562109f838821d2479f0c2d8bebe56e6f06e68217c5ed36f", kill_on_drop: false }`
[INFO] [stdout] 8ddb934a84c80abe562109f838821d2479f0c2d8bebe56e6f06e68217c5ed36f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+90442458ac46b1d5eed752c316da25450f67285b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 572407ce9bd2fda3e7dc2a67984d50e9212672c0eed64d2663cfb5a32acde867
[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" "572407ce9bd2fda3e7dc2a67984d50e9212672c0eed64d2663cfb5a32acde867", kill_on_drop: false }`
[INFO] [stderr]     Checking data-structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:12:30
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn push_front(&self, element: T) {
[INFO] [stdout]    |                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:21:29
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub fn push_back(&self, element: T){
[INFO] [stdout]    |                             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:29:30
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn add_before(&self, element:T, index: i32){
[INFO] [stdout]    |                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:29:41
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn add_before(&self, element:T, index: i32){
[INFO] [stdout]    |                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:31:29
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn add_after(&self, element: T, index: i32){}
[INFO] [stdout]    |                             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:31:41
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn add_after(&self, element: T, index: i32){}
[INFO] [stdout]    |                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:32:24
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn find(&self, element: T) -> Option<T>{
[INFO] [stdout]    |                        ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:35:25
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn erase(&self, element: T){
[INFO] [stdout]    |                         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]  --> src/ds/singly_linked_list.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     value: Box<T>,
[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]  --> src/ds/singly_linked_list.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     next: Option<Box<T>>
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:12:30
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn push_front(&self, element: T) {
[INFO] [stdout]    |                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:21:29
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub fn push_back(&self, element: T){
[INFO] [stdout]    |                             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:29:30
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn add_before(&self, element:T, index: i32){
[INFO] [stdout]    |                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:29:41
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn add_before(&self, element:T, index: i32){
[INFO] [stdout]    |                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:31:29
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn add_after(&self, element: T, index: i32){}
[INFO] [stdout]    |                             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:31:41
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn add_after(&self, element: T, index: i32){}
[INFO] [stdout]    |                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:32:24
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn find(&self, element: T) -> Option<T>{
[INFO] [stdout]    |                        ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `element`
[INFO] [stdout]   --> src/ds/singly_linked_list.rs:35:25
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn erase(&self, element: T){
[INFO] [stdout]    |                         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]  --> src/ds/singly_linked_list.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     value: Box<T>,
[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]  --> src/ds/singly_linked_list.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     next: Option<Box<T>>
[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 0.56s
[INFO] running `Command { std: "docker" "inspect" "572407ce9bd2fda3e7dc2a67984d50e9212672c0eed64d2663cfb5a32acde867", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "572407ce9bd2fda3e7dc2a67984d50e9212672c0eed64d2663cfb5a32acde867", kill_on_drop: false }`
[INFO] [stdout] 572407ce9bd2fda3e7dc2a67984d50e9212672c0eed64d2663cfb5a32acde867