[INFO] cloning repository https://github.com/itbaiyang/rust-book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/itbaiyang/rust-book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitbaiyang%2Frust-book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitbaiyang%2Frust-book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d30d219e0e460fdcabbf62517b3aba374ef2dfd0
[INFO] checking itbaiyang/rust-book against try#6f12b8fe67b4eed2e838dab803ed9493b9d62c0f for pr-79073
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitbaiyang%2Frust-book" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/itbaiyang/rust-book on toolchain 6f12b8fe67b4eed2e838dab803ed9493b9d62c0f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/itbaiyang/rust-book
[INFO] finished tweaking git repo https://github.com/itbaiyang/rust-book
[INFO] tweaked toml for git repo https://github.com/itbaiyang/rust-book written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/itbaiyang/rust-book already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "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] e77a052437b4e1728698011c53ffeab609632c0304469ff3112f1ca4e3a9fae7
[INFO] running `Command { std: "docker" "start" "-a" "e77a052437b4e1728698011c53ffeab609632c0304469ff3112f1ca4e3a9fae7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e77a052437b4e1728698011c53ffeab609632c0304469ff3112f1ca4e3a9fae7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e77a052437b4e1728698011c53ffeab609632c0304469ff3112f1ca4e3a9fae7", kill_on_drop: false }`
[INFO] [stdout] e77a052437b4e1728698011c53ffeab609632c0304469ff3112f1ca4e3a9fae7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 220236bfb742a8b4e94594663b10ac90ca0eeaec2fd387b34318e8efe79b3aa2
[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" "220236bfb742a8b4e94594663b10ac90ca0eeaec2fd387b34318e8efe79b3aa2", kill_on_drop: false }`
[INFO] [stderr]     Checking book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `split_at_mut`
[INFO] [stdout]   --> src/advanced_m/unsafe_init.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[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: function is never used: `split_at_mut`
[INFO] [stdout]   --> src/advanced_m/unsafe_init.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1.56s
[INFO] running `Command { std: "docker" "inspect" "220236bfb742a8b4e94594663b10ac90ca0eeaec2fd387b34318e8efe79b3aa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "220236bfb742a8b4e94594663b10ac90ca0eeaec2fd387b34318e8efe79b3aa2", kill_on_drop: false }`
[INFO] [stdout] 220236bfb742a8b4e94594663b10ac90ca0eeaec2fd387b34318e8efe79b3aa2