[INFO] cloning repository https://github.com/tmazhuan/datastructures_algorithms
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tmazhuan/datastructures_algorithms" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftmazhuan%2Fdatastructures_algorithms", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftmazhuan%2Fdatastructures_algorithms'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1c4140b332eed402795fdca87d585183b8bd6de6
[INFO] checking tmazhuan/datastructures_algorithms against try#6f8a6450478f69b8510c8976ab6c2a70b3b0e47c for pr-84920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftmazhuan%2Fdatastructures_algorithms" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tmazhuan/datastructures_algorithms on toolchain 6f8a6450478f69b8510c8976ab6c2a70b3b0e47c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tmazhuan/datastructures_algorithms
[INFO] finished tweaking git repo https://github.com/tmazhuan/datastructures_algorithms
[INFO] tweaked toml for git repo https://github.com/tmazhuan/datastructures_algorithms written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/tmazhuan/datastructures_algorithms already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3f71a439ea77a0c876a9019d855a90d1d9a3963c10feebaa3e36c27238bc490b
[INFO] running `Command { std: "docker" "start" "-a" "3f71a439ea77a0c876a9019d855a90d1d9a3963c10feebaa3e36c27238bc490b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3f71a439ea77a0c876a9019d855a90d1d9a3963c10feebaa3e36c27238bc490b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f71a439ea77a0c876a9019d855a90d1d9a3963c10feebaa3e36c27238bc490b", kill_on_drop: false }`
[INFO] [stdout] 3f71a439ea77a0c876a9019d855a90d1d9a3963c10feebaa3e36c27238bc490b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+6f8a6450478f69b8510c8976ab6c2a70b3b0e47c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 948a7e02c25c6ca5db45a8aaa93285614387e029a9cdc4347b1ede79b5d70871
[INFO] running `Command { std: "docker" "start" "-a" "948a7e02c25c6ca5db45a8aaa93285614387e029a9cdc4347b1ede79b5d70871", kill_on_drop: false }`
[INFO] [stderr]     Checking fifo v0.1.0 (/opt/rustwide/workdir/fifo)
[INFO] [stderr]     Checking lists v0.1.0 (/opt/rustwide/workdir/lists)
[INFO] [stderr]     Checking lifo v0.1.0 (/opt/rustwide/workdir/lifo)
[INFO] [stdout] warning: field is never read: `head`
[INFO] [stdout]   --> lifo/src/lib.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |         head: Link<T>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `head`
[INFO] [stdout]   --> lifo/src/lib.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |         head: Link<T>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tester v0.1.0 (/opt/rustwide/workdir/tester)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.26s
[INFO] running `Command { std: "docker" "inspect" "948a7e02c25c6ca5db45a8aaa93285614387e029a9cdc4347b1ede79b5d70871", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "948a7e02c25c6ca5db45a8aaa93285614387e029a9cdc4347b1ede79b5d70871", kill_on_drop: false }`
[INFO] [stdout] 948a7e02c25c6ca5db45a8aaa93285614387e029a9cdc4347b1ede79b5d70871