[INFO] fetching crate mastermind 0.1.5...
[INFO] checking mastermind-0.1.5 against beta for pr-78714
[INFO] extracting crate mastermind 0.1.5 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate mastermind 0.1.5 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 mastermind 0.1.5
[INFO] finished tweaking crates.io crate mastermind 0.1.5
[INFO] tweaked toml for crates.io crate mastermind 0.1.5 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2308bc6dd4c78ff9fe674ace9fbb308a5b25453ded953005876f6a6edf2ac14d
[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" "2308bc6dd4c78ff9fe674ace9fbb308a5b25453ded953005876f6a6edf2ac14d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2308bc6dd4c78ff9fe674ace9fbb308a5b25453ded953005876f6a6edf2ac14d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2308bc6dd4c78ff9fe674ace9fbb308a5b25453ded953005876f6a6edf2ac14d", kill_on_drop: false }`
[INFO] [stdout] 2308bc6dd4c78ff9fe674ace9fbb308a5b25453ded953005876f6a6edf2ac14d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "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] f6416ad952dc3c17d08b5f8746e7a5101788793b5fd89bacc4c25ffc3f8654c1
[INFO] running `Command { std: "docker" "start" "-a" "f6416ad952dc3c17d08b5f8746e7a5101788793b5fd89bacc4c25ffc3f8654c1", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking mastermind v0.1.5 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.56s
[INFO] running `Command { std: "docker" "inspect" "f6416ad952dc3c17d08b5f8746e7a5101788793b5fd89bacc4c25ffc3f8654c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f6416ad952dc3c17d08b5f8746e7a5101788793b5fd89bacc4c25ffc3f8654c1", kill_on_drop: false }`
[INFO] [stdout] f6416ad952dc3c17d08b5f8746e7a5101788793b5fd89bacc4c25ffc3f8654c1