[INFO] fetching crate xargo 0.3.21...
[INFO] checking xargo-0.3.21 against try#d990716b6a1fdde1300748828a9c9e79dfd0b898 for pr-74846
[INFO] extracting crate xargo 0.3.21 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate xargo 0.3.21 on toolchain d990716b6a1fdde1300748828a9c9e79dfd0b898
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate xargo 0.3.21
[INFO] finished tweaking crates.io crate xargo 0.3.21
[INFO] tweaked toml for crates.io crate xargo 0.3.21 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate xargo 0.3.21 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d7bdb3d50c9f6584c8d11ee5d84396c98bdd6b907b20d3eeebf8d63c721fbf5
[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" "0d7bdb3d50c9f6584c8d11ee5d84396c98bdd6b907b20d3eeebf8d63c721fbf5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d7bdb3d50c9f6584c8d11ee5d84396c98bdd6b907b20d3eeebf8d63c721fbf5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d7bdb3d50c9f6584c8d11ee5d84396c98bdd6b907b20d3eeebf8d63c721fbf5", kill_on_drop: false }`
[INFO] [stdout] 0d7bdb3d50c9f6584c8d11ee5d84396c98bdd6b907b20d3eeebf8d63c721fbf5
[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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 460c613d167a2944c95f63e79b9e46420b6e789fbf2e1c141a51ac9830acea16
[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" "460c613d167a2944c95f63e79b9e46420b6e789fbf2e1c141a51ac9830acea16", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.72
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]    Compiling xargo v0.3.21 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking semver v0.1.20
[INFO] [stderr]     Checking owning_ref v0.2.4
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]     Checking rustc_version v0.1.7
[INFO] [stderr]     Checking smallvec v0.6.13
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking thread-id v3.3.0
[INFO] [stderr]     Checking error-chain v0.7.2
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stderr]     Checking serde_json v0.8.6
[INFO] [stderr]     Checking parking_lot v0.3.8
[INFO] [stderr]     Checking toml v0.2.1
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.05s
[INFO] running `Command { std: "docker" "inspect" "460c613d167a2944c95f63e79b9e46420b6e789fbf2e1c141a51ac9830acea16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "460c613d167a2944c95f63e79b9e46420b6e789fbf2e1c141a51ac9830acea16", kill_on_drop: false }`
[INFO] [stdout] 460c613d167a2944c95f63e79b9e46420b6e789fbf2e1c141a51ac9830acea16