[INFO] cloning repository https://github.com/Leibuyun/algorithm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Leibuyun/algorithm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeibuyun%2Falgorithm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeibuyun%2Falgorithm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 552088c28d9c598283c879ec400bbad39099f47b
[INFO] checking Leibuyun/algorithm against try#15e8bc6907ab2b3623cb52acc726f4787458df64 for pr-141352
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeibuyun%2Falgorithm" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Leibuyun/algorithm on toolchain 15e8bc6907ab2b3623cb52acc726f4787458df64
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Leibuyun/algorithm
[INFO] finished tweaking git repo https://github.com/Leibuyun/algorithm
[INFO] tweaked toml for git repo https://github.com/Leibuyun/algorithm written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Leibuyun/algorithm already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking Leibuyun/algorithm against try#15e8bc6907ab2b3623cb52acc726f4787458df64 for pr-141352
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeibuyun%2Falgorithm" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Leibuyun/algorithm on toolchain 15e8bc6907ab2b3623cb52acc726f4787458df64
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Leibuyun/algorithm
[INFO] finished tweaking git repo https://github.com/Leibuyun/algorithm
[INFO] tweaked toml for git repo https://github.com/Leibuyun/algorithm written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Leibuyun/algorithm already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 43cf194a64f5f9cfcf2cdc910dfe3abe8141b1b677ac83b14b15aad8dbd5acfa
[INFO] running `Command { std: "docker" "start" "-a" "43cf194a64f5f9cfcf2cdc910dfe3abe8141b1b677ac83b14b15aad8dbd5acfa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43cf194a64f5f9cfcf2cdc910dfe3abe8141b1b677ac83b14b15aad8dbd5acfa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43cf194a64f5f9cfcf2cdc910dfe3abe8141b1b677ac83b14b15aad8dbd5acfa", kill_on_drop: false }`
[INFO] [stdout] 43cf194a64f5f9cfcf2cdc910dfe3abe8141b1b677ac83b14b15aad8dbd5acfa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "RUSTDOCFLAGS=--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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b9daeb39a2863aef40bcccb91247e97f0df3279ca1fc81f432ba838c44aba11d
[INFO] running `Command { std: "docker" "start" "-a" "b9daeb39a2863aef40bcccb91247e97f0df3279ca1fc81f432ba838c44aba11d", kill_on_drop: false }`
[INFO] [stderr]     Checking algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/backtracking/n_queens.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `n_queens_solver` is never used
[INFO] [stdout]  --> src/backtracking/n_queens.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn n_queens_solver(n: usize) {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_safe` is never used
[INFO] [stdout]  --> src/backtracking/n_queens.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn is_safe(board: &mut Vec<Vec<char>>, row: usize, col: usize) -> bool {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `solve` is never used
[INFO] [stdout]   --> src/backtracking/n_queens.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn solve(board: &mut Vec<Vec<char>>, row: usize, solutions: &mut Vec<Vec<String>>) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `n_queens_solver` is never used
[INFO] [stdout]  --> src/backtracking/n_queens.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn n_queens_solver(n: usize) {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_safe` is never used
[INFO] [stdout]  --> src/backtracking/n_queens.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn is_safe(board: &mut Vec<Vec<char>>, row: usize, col: usize) -> bool {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `solve` is never used
[INFO] [stdout]   --> src/backtracking/n_queens.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn solve(board: &mut Vec<Vec<char>>, row: usize, solutions: &mut Vec<Vec<String>>) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "b9daeb39a2863aef40bcccb91247e97f0df3279ca1fc81f432ba838c44aba11d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9daeb39a2863aef40bcccb91247e97f0df3279ca1fc81f432ba838c44aba11d", kill_on_drop: false }`
[INFO] [stdout] b9daeb39a2863aef40bcccb91247e97f0df3279ca1fc81f432ba838c44aba11d