[INFO] fetching crate math-concept 0.0.3...
[INFO] checking math-concept-0.0.3 against beta for pr-78714
[INFO] extracting crate math-concept 0.0.3 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate math-concept 0.0.3 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 math-concept 0.0.3
[INFO] finished tweaking crates.io crate math-concept 0.0.3
[INFO] tweaked toml for crates.io crate math-concept 0.0.3 written to /workspace/builds/worker-0/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-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 771862b3c4f6d1818ac1900e91a5ba4fb72046c7cd50f0bbc0a9b0be095b9a87
[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" "771862b3c4f6d1818ac1900e91a5ba4fb72046c7cd50f0bbc0a9b0be095b9a87", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "771862b3c4f6d1818ac1900e91a5ba4fb72046c7cd50f0bbc0a9b0be095b9a87", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "771862b3c4f6d1818ac1900e91a5ba4fb72046c7cd50f0bbc0a9b0be095b9a87", kill_on_drop: false }`
[INFO] [stdout] 771862b3c4f6d1818ac1900e91a5ba4fb72046c7cd50f0bbc0a9b0be095b9a87
[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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 656b9e7f776bfb808356769d57d51a3f90fb3cfd6fa144e2219bd4a51e10ccf9
[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" "656b9e7f776bfb808356769d57d51a3f90fb3cfd6fa144e2219bd4a51e10ccf9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking math-concept v0.0.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.63s
[INFO] running `Command { std: "docker" "inspect" "656b9e7f776bfb808356769d57d51a3f90fb3cfd6fa144e2219bd4a51e10ccf9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "656b9e7f776bfb808356769d57d51a3f90fb3cfd6fa144e2219bd4a51e10ccf9", kill_on_drop: false }`
[INFO] [stdout] 656b9e7f776bfb808356769d57d51a3f90fb3cfd6fa144e2219bd4a51e10ccf9