[INFO] fetching crate unreferenced_files 1.0.0...
[INFO] checking unreferenced_files-1.0.0 against beta for pr-78714
[INFO] extracting crate unreferenced_files 1.0.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate unreferenced_files 1.0.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unreferenced_files 1.0.0
[INFO] finished tweaking crates.io crate unreferenced_files 1.0.0
[INFO] tweaked toml for crates.io crate unreferenced_files 1.0.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate crates.io crate unreferenced_files 1.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c7153087872af4701d08eb4ae8a0d2fec2527c1a400b388be1d0db5f5acebab8
[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" "c7153087872af4701d08eb4ae8a0d2fec2527c1a400b388be1d0db5f5acebab8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c7153087872af4701d08eb4ae8a0d2fec2527c1a400b388be1d0db5f5acebab8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7153087872af4701d08eb4ae8a0d2fec2527c1a400b388be1d0db5f5acebab8", kill_on_drop: false }`
[INFO] [stdout] c7153087872af4701d08eb4ae8a0d2fec2527c1a400b388be1d0db5f5acebab8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c6e2caa5a05436f280806563a2a88f883013d1e5dee2d094308e0587c20486a9
[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" "c6e2caa5a05436f280806563a2a88f883013d1e5dee2d094308e0587c20486a9", kill_on_drop: false }`
[INFO] [stderr]     Checking env_logger v0.8.1
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling structopt-derive v0.4.13
[INFO] [stderr]     Checking structopt v0.3.20
[INFO] [stderr]     Checking unreferenced_files v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.95s
[INFO] running `Command { std: "docker" "inspect" "c6e2caa5a05436f280806563a2a88f883013d1e5dee2d094308e0587c20486a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6e2caa5a05436f280806563a2a88f883013d1e5dee2d094308e0587c20486a9", kill_on_drop: false }`
[INFO] [stdout] c6e2caa5a05436f280806563a2a88f883013d1e5dee2d094308e0587c20486a9