[INFO] cloning repository https://github.com/walkerrandolphsmith/rust-data-structures
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/walkerrandolphsmith/rust-data-structures" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwalkerrandolphsmith%2Frust-data-structures", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwalkerrandolphsmith%2Frust-data-structures'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9e5b989378823c3a9ba0392ba2df0740947ecbef
[INFO] checking walkerrandolphsmith/rust-data-structures against master#4fa76a4a7742bb9c1febe33019f5a9e7e4839a65 for pr-83744
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwalkerrandolphsmith%2Frust-data-structures" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/walkerrandolphsmith/rust-data-structures on toolchain 4fa76a4a7742bb9c1febe33019f5a9e7e4839a65
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/walkerrandolphsmith/rust-data-structures
[INFO] finished tweaking git repo https://github.com/walkerrandolphsmith/rust-data-structures
[INFO] tweaked toml for git repo https://github.com/walkerrandolphsmith/rust-data-structures written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/walkerrandolphsmith/rust-data-structures already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 18d163ba5011945f2c14d5d5df6ec7c0b1f89203a0cfad93986fe80d5b03e452
[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" "18d163ba5011945f2c14d5d5df6ec7c0b1f89203a0cfad93986fe80d5b03e452", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18d163ba5011945f2c14d5d5df6ec7c0b1f89203a0cfad93986fe80d5b03e452", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18d163ba5011945f2c14d5d5df6ec7c0b1f89203a0cfad93986fe80d5b03e452", kill_on_drop: false }`
[INFO] [stdout] 18d163ba5011945f2c14d5d5df6ec7c0b1f89203a0cfad93986fe80d5b03e452
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "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] 93574c7ecb3a55b9314e10b8757f25cc012ca21712673f64ce660e955bb57d0b
[INFO] running `Command { std: "docker" "start" "-a" "93574c7ecb3a55b9314e10b8757f25cc012ca21712673f64ce660e955bb57d0b", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_data_structures v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `should_add_two`
[INFO] [stdout]  --> src/lib.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn should_add_two() {
[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 0.47s
[INFO] running `Command { std: "docker" "inspect" "93574c7ecb3a55b9314e10b8757f25cc012ca21712673f64ce660e955bb57d0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93574c7ecb3a55b9314e10b8757f25cc012ca21712673f64ce660e955bb57d0b", kill_on_drop: false }`
[INFO] [stdout] 93574c7ecb3a55b9314e10b8757f25cc012ca21712673f64ce660e955bb57d0b