[INFO] cloning repository https://github.com/nnenn0/algo-lib-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nnenn0/algo-lib-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnnenn0%2Falgo-lib-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnnenn0%2Falgo-lib-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f66b3a6a91d7bee7c3fd8b6497f58916b377a655
[INFO] checking nnenn0/algo-lib-rust against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnnenn0%2Falgo-lib-rust" "/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/nnenn0/algo-lib-rust on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nnenn0/algo-lib-rust
[INFO] finished tweaking git repo https://github.com/nnenn0/algo-lib-rust
[INFO] tweaked toml for git repo https://github.com/nnenn0/algo-lib-rust written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/nnenn0/algo-lib-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 751338a6f9760a43234d18f94ec5ec7cbb91ce3a8d72f3e6e52982d2312ffe98
[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" "751338a6f9760a43234d18f94ec5ec7cbb91ce3a8d72f3e6e52982d2312ffe98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "751338a6f9760a43234d18f94ec5ec7cbb91ce3a8d72f3e6e52982d2312ffe98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "751338a6f9760a43234d18f94ec5ec7cbb91ce3a8d72f3e6e52982d2312ffe98", kill_on_drop: false }`
[INFO] [stdout] 751338a6f9760a43234d18f94ec5ec7cbb91ce3a8d72f3e6e52982d2312ffe98
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] faa2044b806ccf3784dd27fedb49e391069c26cbe5f2eb994fd1af29e7c9b42d
[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" "faa2044b806ccf3784dd27fedb49e391069c26cbe5f2eb994fd1af29e7c9b42d", kill_on_drop: false }`
[INFO] [stderr]     Checking proconio v0.4.3
[INFO] [stderr]     Checking algo-lib-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct is never constructed: `UnionFind`
[INFO] [stdout]  --> src/data_structure/union_find.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct UnionFind {
[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: `new`
[INFO] [stdout]   --> src/data_structure/union_find.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn new(n: usize) -> UnionFind {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unite`
[INFO] [stdout]   --> src/data_structure/union_find.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn unite(&mut self, mut x: usize, mut y: usize) {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_same`
[INFO] [stdout]   --> src/data_structure/union_find.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn is_same(&mut self, x: usize, y: usize) -> bool {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_root`
[INFO] [stdout]   --> src/data_structure/union_find.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn get_root(&mut self, x: usize) -> usize {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_size`
[INFO] [stdout]   --> src/data_structure/union_find.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub fn get_size(&mut self, x: usize) -> usize {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run_length_encode`
[INFO] [stdout]  --> src/string/run_length_encode.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn run_length_encode(s: Vec<char>) -> Vec<(char, usize)> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run_length_decode`
[INFO] [stdout]   --> src/string/run_length_encode.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn run_length_decode(code: Vec<(char, usize)>) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.92s
[INFO] running `Command { std: "docker" "inspect" "faa2044b806ccf3784dd27fedb49e391069c26cbe5f2eb994fd1af29e7c9b42d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "faa2044b806ccf3784dd27fedb49e391069c26cbe5f2eb994fd1af29e7c9b42d", kill_on_drop: false }`
[INFO] [stdout] faa2044b806ccf3784dd27fedb49e391069c26cbe5f2eb994fd1af29e7c9b42d