[INFO] fetching crate signalo_sources 0.5.1...
[INFO] checking signalo_sources-0.5.1 against beta for pr-78714
[INFO] extracting crate signalo_sources 0.5.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate signalo_sources 0.5.1 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 signalo_sources 0.5.1
[INFO] finished tweaking crates.io crate signalo_sources 0.5.1
[INFO] tweaked toml for crates.io crate signalo_sources 0.5.1 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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ed5109c71f28b064dea56750ff4286855f007d5a301647d699a34ca2f79cd699
[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" "ed5109c71f28b064dea56750ff4286855f007d5a301647d699a34ca2f79cd699", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ed5109c71f28b064dea56750ff4286855f007d5a301647d699a34ca2f79cd699", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed5109c71f28b064dea56750ff4286855f007d5a301647d699a34ca2f79cd699", kill_on_drop: false }`
[INFO] [stdout] ed5109c71f28b064dea56750ff4286855f007d5a301647d699a34ca2f79cd699
[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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cdc1e72222681230b714dd3e8e64c729a285f70f37e408003187a84159985e4d
[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" "cdc1e72222681230b714dd3e8e64c729a285f70f37e408003187a84159985e4d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling dimensioned v0.7.0
[INFO] [stderr]     Checking signalo_traits v0.4.0
[INFO] [stderr]     Checking nearly_eq v0.2.4
[INFO] [stderr]     Checking generic-array v0.11.1
[INFO] [stderr]     Checking signalo_sources v0.5.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.42s
[INFO] running `Command { std: "docker" "inspect" "cdc1e72222681230b714dd3e8e64c729a285f70f37e408003187a84159985e4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdc1e72222681230b714dd3e8e64c729a285f70f37e408003187a84159985e4d", kill_on_drop: false }`
[INFO] [stdout] cdc1e72222681230b714dd3e8e64c729a285f70f37e408003187a84159985e4d