[INFO] fetching crate ferret 1.0.0...
[INFO] checking ferret-1.0.0 against master#39b841dfe36f90a7cd111e7f0c55f32594f6e578 for pr-77035
[INFO] extracting crate ferret 1.0.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate ferret 1.0.0 on toolchain 39b841dfe36f90a7cd111e7f0c55f32594f6e578
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ferret 1.0.0
[INFO] finished tweaking crates.io crate ferret 1.0.0
[INFO] tweaked toml for crates.io crate ferret 1.0.0 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate crates.io crate ferret 1.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "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] c4b9cf770edb24b01b86204da8d5780b42db9e6d500cca22bbfa2e5f3bc15891
[INFO] running `Command { std: "docker" "start" "-a" "c4b9cf770edb24b01b86204da8d5780b42db9e6d500cca22bbfa2e5f3bc15891", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c4b9cf770edb24b01b86204da8d5780b42db9e6d500cca22bbfa2e5f3bc15891", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4b9cf770edb24b01b86204da8d5780b42db9e6d500cca22bbfa2e5f3bc15891", kill_on_drop: false }`
[INFO] [stdout] c4b9cf770edb24b01b86204da8d5780b42db9e6d500cca22bbfa2e5f3bc15891
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 186b0db0552c3f59e598f36b1967dcaf9a2738978b1ab94af8cdd2762214354d
[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" "186b0db0552c3f59e598f36b1967dcaf9a2738978b1ab94af8cdd2762214354d", kill_on_drop: false }`
[INFO] [stderr]     Checking ferret v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.85s
[INFO] running `Command { std: "docker" "inspect" "186b0db0552c3f59e598f36b1967dcaf9a2738978b1ab94af8cdd2762214354d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "186b0db0552c3f59e598f36b1967dcaf9a2738978b1ab94af8cdd2762214354d", kill_on_drop: false }`
[INFO] [stdout] 186b0db0552c3f59e598f36b1967dcaf9a2738978b1ab94af8cdd2762214354d