[INFO] cloning repository https://github.com/raghavendra-nataraj/rustling-solution
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/raghavendra-nataraj/rustling-solution" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fraghavendra-nataraj%2Frustling-solution", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fraghavendra-nataraj%2Frustling-solution'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0ea9e790fe1611836d83b83a64083ab9f45c8ee0
[INFO] checking raghavendra-nataraj/rustling-solution against master#195ad4830e11a544391abe296b146450dea8411b for pr-82781
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fraghavendra-nataraj%2Frustling-solution" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/raghavendra-nataraj/rustling-solution on toolchain 195ad4830e11a544391abe296b146450dea8411b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/raghavendra-nataraj/rustling-solution
[INFO] finished tweaking git repo https://github.com/raghavendra-nataraj/rustling-solution
[INFO] tweaked toml for git repo https://github.com/raghavendra-nataraj/rustling-solution written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/raghavendra-nataraj/rustling-solution already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 18a33b45c16448d37c8b5defdf6297c950f115ec1985d4c4835884f6b88b844c
[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" "18a33b45c16448d37c8b5defdf6297c950f115ec1985d4c4835884f6b88b844c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18a33b45c16448d37c8b5defdf6297c950f115ec1985d4c4835884f6b88b844c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18a33b45c16448d37c8b5defdf6297c950f115ec1985d4c4835884f6b88b844c", kill_on_drop: false }`
[INFO] [stdout] 18a33b45c16448d37c8b5defdf6297c950f115ec1985d4c4835884f6b88b844c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fe7b17b125e7e6c0683510cab73aba1dd9f375e652e5cb02b235d2a964cfedc8
[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" "fe7b17b125e7e6c0683510cab73aba1dd9f375e652e5cb02b235d2a964cfedc8", kill_on_drop: false }`
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking lazycell v1.2.1
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking walkdir v2.2.7
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking clicolors-control v1.0.0
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking filetime v0.2.5
[INFO] [stderr]    Compiling parking_lot_core v0.5.0
[INFO] [stderr]    Compiling parking_lot v0.8.0
[INFO] [stderr]     Checking inotify v0.7.0
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]     Checking predicates v1.0.1
[INFO] [stderr]     Checking lock_api v0.2.0
[INFO] [stderr]     Checking console v0.8.0
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking mio v0.6.19
[INFO] [stderr]     Checking mio-extras v2.0.5
[INFO] [stderr]     Checking notify v4.0.15
[INFO] [stderr]     Checking indicatif v0.10.3
[INFO] [stderr]     Checking console v0.7.7
[INFO] [stderr]    Compiling serde_derive v1.0.92
[INFO] [stderr]     Checking serde v1.0.92
[INFO] [stderr]     Checking serde_json v1.0.39
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking rustlings v3.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking escargot v0.4.0
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 42.89s
[INFO] running `Command { std: "docker" "inspect" "fe7b17b125e7e6c0683510cab73aba1dd9f375e652e5cb02b235d2a964cfedc8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe7b17b125e7e6c0683510cab73aba1dd9f375e652e5cb02b235d2a964cfedc8", kill_on_drop: false }`
[INFO] [stdout] fe7b17b125e7e6c0683510cab73aba1dd9f375e652e5cb02b235d2a964cfedc8