[INFO] fetching crate document_tree 0.4.0...
[INFO] checking document_tree-0.4.0 against beta for pr-78714
[INFO] extracting crate document_tree 0.4.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate document_tree 0.4.0 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 document_tree 0.4.0
[INFO] finished tweaking crates.io crate document_tree 0.4.0
[INFO] tweaked toml for crates.io crate document_tree 0.4.0 written to /workspace/builds/worker-6/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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9b30785c566713bb8309de8a206985ed5bcc0c67d25b01cd8dbd1af2f0974104
[INFO] running `Command { std: "docker" "start" "-a" "9b30785c566713bb8309de8a206985ed5bcc0c67d25b01cd8dbd1af2f0974104", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9b30785c566713bb8309de8a206985ed5bcc0c67d25b01cd8dbd1af2f0974104", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b30785c566713bb8309de8a206985ed5bcc0c67d25b01cd8dbd1af2f0974104", kill_on_drop: false }`
[INFO] [stdout] 9b30785c566713bb8309de8a206985ed5bcc0c67d25b01cd8dbd1af2f0974104
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c96ea2e55a89f5d5fd08dc78bf7facb7b33c972a23f40e8dbd53618e80e2138e
[INFO] running `Command { std: "docker" "start" "-a" "c96ea2e55a89f5d5fd08dc78bf7facb7b33c972a23f40e8dbd53618e80e2138e", kill_on_drop: false }`
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking document_tree v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.74s
[INFO] running `Command { std: "docker" "inspect" "c96ea2e55a89f5d5fd08dc78bf7facb7b33c972a23f40e8dbd53618e80e2138e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c96ea2e55a89f5d5fd08dc78bf7facb7b33c972a23f40e8dbd53618e80e2138e", kill_on_drop: false }`
[INFO] [stdout] c96ea2e55a89f5d5fd08dc78bf7facb7b33c972a23f40e8dbd53618e80e2138e