[INFO] fetching crate art_exercise_2019 0.1.0...
[INFO] testing art_exercise_2019-0.1.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate art_exercise_2019 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate art_exercise_2019 0.1.0 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate art_exercise_2019 0.1.0
[INFO] finished tweaking crates.io crate art_exercise_2019 0.1.0
[INFO] tweaked toml for crates.io crate art_exercise_2019 0.1.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "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] d4e683e9942aeac5af307cd49af6d1b2376b091010fb8cf60d84680657d4b65a
[INFO] running `Command { std: "docker" "start" "-a" "d4e683e9942aeac5af307cd49af6d1b2376b091010fb8cf60d84680657d4b65a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d4e683e9942aeac5af307cd49af6d1b2376b091010fb8cf60d84680657d4b65a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4e683e9942aeac5af307cd49af6d1b2376b091010fb8cf60d84680657d4b65a", kill_on_drop: false }`
[INFO] [stdout] d4e683e9942aeac5af307cd49af6d1b2376b091010fb8cf60d84680657d4b65a
[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=warn" "-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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c3ec54be4e91cf5f1ecd993b83dc54c825b97a33c8ea3f1a5a17ac02fa650074
[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" "c3ec54be4e91cf5f1ecd993b83dc54c825b97a33c8ea3f1a5a17ac02fa650074", kill_on_drop: false }`
[INFO] [stderr]    Compiling art_exercise_2019 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `Command { std: "docker" "inspect" "c3ec54be4e91cf5f1ecd993b83dc54c825b97a33c8ea3f1a5a17ac02fa650074", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3ec54be4e91cf5f1ecd993b83dc54c825b97a33c8ea3f1a5a17ac02fa650074", kill_on_drop: false }`
[INFO] [stdout] c3ec54be4e91cf5f1ecd993b83dc54c825b97a33c8ea3f1a5a17ac02fa650074
[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=warn" "-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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--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] 5266e716ce64089e7bd1b653e0967b9f9e51e9e7fa14aa0eeaaa37e7cf1b5c2e
[INFO] running `Command { std: "docker" "start" "-a" "5266e716ce64089e7bd1b653e0967b9f9e51e9e7fa14aa0eeaaa37e7cf1b5c2e", kill_on_drop: false }`
[INFO] [stderr]    Compiling art_exercise_2019 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.82s
[INFO] running `Command { std: "docker" "inspect" "5266e716ce64089e7bd1b653e0967b9f9e51e9e7fa14aa0eeaaa37e7cf1b5c2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5266e716ce64089e7bd1b653e0967b9f9e51e9e7fa14aa0eeaaa37e7cf1b5c2e", kill_on_drop: false }`
[INFO] [stdout] 5266e716ce64089e7bd1b653e0967b9f9e51e9e7fa14aa0eeaaa37e7cf1b5c2e
[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=warn" "-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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b9cb8c6007ccc0cdd4beb0b8fdb3c598cd0917ce138b4b7bab13704b22b998d4
[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" "b9cb8c6007ccc0cdd4beb0b8fdb3c598cd0917ce138b4b7bab13704b22b998d4", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/art_exercise_2019-a20bcd16a627e409
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/art_exercise_2019-4c75405a65407a38
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    Doc-tests art_exercise_2019
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b9cb8c6007ccc0cdd4beb0b8fdb3c598cd0917ce138b4b7bab13704b22b998d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9cb8c6007ccc0cdd4beb0b8fdb3c598cd0917ce138b4b7bab13704b22b998d4", kill_on_drop: false }`
[INFO] [stdout] b9cb8c6007ccc0cdd4beb0b8fdb3c598cd0917ce138b4b7bab13704b22b998d4