[INFO] fetching crate flow_arena 0.4.4...
[INFO] testing flow_arena-0.4.4 against 1.55.0 for beta-1.56-1
[INFO] extracting crate flow_arena 0.4.4 into /workspace/builds/worker-60/source
[INFO] validating manifest of crates.io crate flow_arena 0.4.4 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flow_arena 0.4.4
[INFO] finished tweaking crates.io crate flow_arena 0.4.4
[INFO] tweaked toml for crates.io crate flow_arena 0.4.4 written to /workspace/builds/worker-60/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7e76d56ed9dbf9bc6ccc2b6325f3dcb9b383c7c63bb311858d5faa5bd8656b3a
[INFO] running `Command { std: "docker" "start" "-a" "7e76d56ed9dbf9bc6ccc2b6325f3dcb9b383c7c63bb311858d5faa5bd8656b3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7e76d56ed9dbf9bc6ccc2b6325f3dcb9b383c7c63bb311858d5faa5bd8656b3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e76d56ed9dbf9bc6ccc2b6325f3dcb9b383c7c63bb311858d5faa5bd8656b3a", kill_on_drop: false }`
[INFO] [stdout] 7e76d56ed9dbf9bc6ccc2b6325f3dcb9b383c7c63bb311858d5faa5bd8656b3a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 64e8b90d8d2eb781f490220a8534e535d0f08d6eda5365d8489f213f73ee5f1b
[INFO] running `Command { std: "docker" "start" "-a" "64e8b90d8d2eb781f490220a8534e535d0f08d6eda5365d8489f213f73ee5f1b", kill_on_drop: false }`
[INFO] [stderr]    Compiling flow_arena v0.4.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.22s
[INFO] running `Command { std: "docker" "inspect" "64e8b90d8d2eb781f490220a8534e535d0f08d6eda5365d8489f213f73ee5f1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64e8b90d8d2eb781f490220a8534e535d0f08d6eda5365d8489f213f73ee5f1b", kill_on_drop: false }`
[INFO] [stdout] 64e8b90d8d2eb781f490220a8534e535d0f08d6eda5365d8489f213f73ee5f1b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c60e58d0c5f7eb45640de75864da77e85830d72376c979be8ffb5112e3fd0afd
[INFO] running `Command { std: "docker" "start" "-a" "c60e58d0c5f7eb45640de75864da77e85830d72376c979be8ffb5112e3fd0afd", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling flow_arena v0.4.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.05s
[INFO] running `Command { std: "docker" "inspect" "c60e58d0c5f7eb45640de75864da77e85830d72376c979be8ffb5112e3fd0afd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c60e58d0c5f7eb45640de75864da77e85830d72376c979be8ffb5112e3fd0afd", kill_on_drop: false }`
[INFO] [stdout] c60e58d0c5f7eb45640de75864da77e85830d72376c979be8ffb5112e3fd0afd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 2bfb78df839806446a170cb7d2fe74c0a0a35d85f2ac4d55c8f0ea394340d59e
[INFO] running `Command { std: "docker" "start" "-a" "2bfb78df839806446a170cb7d2fe74c0a0a35d85f2ac4d55c8f0ea394340d59e", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/flow_arena-95626b1b2a8a800b)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test arena::tests::flow_dock ... ok
[INFO] [stdout] test arena::tests::iter ... ok
[INFO] [stdout] test arena::tests::serde ... ok
[INFO] [stdout] test arena::tests::main_test ... ok
[INFO] [stdout] test arena::tests::offspring_ownership ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    Doc-tests flow_arena
[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" "2bfb78df839806446a170cb7d2fe74c0a0a35d85f2ac4d55c8f0ea394340d59e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2bfb78df839806446a170cb7d2fe74c0a0a35d85f2ac4d55c8f0ea394340d59e", kill_on_drop: false }`
[INFO] [stdout] 2bfb78df839806446a170cb7d2fe74c0a0a35d85f2ac4d55c8f0ea394340d59e