[INFO] fetching crate art_exercise_2019 0.1.0...
[INFO] testing art_exercise_2019-0.1.0 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate art_exercise_2019 0.1.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate art_exercise_2019 0.1.0 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1e7e8516365721a421ac5a2459c691a6f10a6097a36420538d903f96229ba863
[INFO] running `Command { std: "docker" "start" "-a" "1e7e8516365721a421ac5a2459c691a6f10a6097a36420538d903f96229ba863", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e7e8516365721a421ac5a2459c691a6f10a6097a36420538d903f96229ba863", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e7e8516365721a421ac5a2459c691a6f10a6097a36420538d903f96229ba863", kill_on_drop: false }`
[INFO] [stdout] 1e7e8516365721a421ac5a2459c691a6f10a6097a36420538d903f96229ba863
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0ebf21bf73deff066445834cd3669286805d5d391c765554f1f2f6893bc1032b
[INFO] running `Command { std: "docker" "start" "-a" "0ebf21bf73deff066445834cd3669286805d5d391c765554f1f2f6893bc1032b", 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 1.07s
[INFO] running `Command { std: "docker" "inspect" "0ebf21bf73deff066445834cd3669286805d5d391c765554f1f2f6893bc1032b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ebf21bf73deff066445834cd3669286805d5d391c765554f1f2f6893bc1032b", kill_on_drop: false }`
[INFO] [stdout] 0ebf21bf73deff066445834cd3669286805d5d391c765554f1f2f6893bc1032b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3f5d8064387f0ff1463f536589a64cc5f928d3a74cbdb8f32ab1b7a388394f30
[INFO] running `Command { std: "docker" "start" "-a" "3f5d8064387f0ff1463f536589a64cc5f928d3a74cbdb8f32ab1b7a388394f30", 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 0.43s
[INFO] [stderr]   Executable unittests src/lib.rs (/opt/rustwide/target/debug/deps/art_exercise_2019-7db2c06f84fdf50e)
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/art_exercise_2019-9a45fdd49d133d4b)
[INFO] running `Command { std: "docker" "inspect" "3f5d8064387f0ff1463f536589a64cc5f928d3a74cbdb8f32ab1b7a388394f30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f5d8064387f0ff1463f536589a64cc5f928d3a74cbdb8f32ab1b7a388394f30", kill_on_drop: false }`
[INFO] [stdout] 3f5d8064387f0ff1463f536589a64cc5f928d3a74cbdb8f32ab1b7a388394f30
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4fd7a3f8ce242ea401251e41147337339f7f5585878168f8bc22da769a55eb2a
[INFO] running `Command { std: "docker" "start" "-a" "4fd7a3f8ce242ea401251e41147337339f7f5585878168f8bc22da769a55eb2a", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/art_exercise_2019-7db2c06f84fdf50e)
[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] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/art_exercise_2019-9a45fdd49d133d4b)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests art_exercise_2019
[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" "4fd7a3f8ce242ea401251e41147337339f7f5585878168f8bc22da769a55eb2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4fd7a3f8ce242ea401251e41147337339f7f5585878168f8bc22da769a55eb2a", kill_on_drop: false }`
[INFO] [stdout] 4fd7a3f8ce242ea401251e41147337339f7f5585878168f8bc22da769a55eb2a