[INFO] fetching crate low 0.0.0...
[INFO] testing low-0.0.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate low 0.0.0 into /workspace/builds/worker-55/source
[INFO] validating manifest of crates.io crate low 0.0.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate low 0.0.0
[INFO] finished tweaking crates.io crate low 0.0.0
[INFO] tweaked toml for crates.io crate low 0.0.0 written to /workspace/builds/worker-55/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fbd053afe4eaa9728ed2e763acbad883deb2d8bbdc1fe4aac1cfd134bdb00309
[INFO] running `Command { std: "docker" "start" "-a" "fbd053afe4eaa9728ed2e763acbad883deb2d8bbdc1fe4aac1cfd134bdb00309", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fbd053afe4eaa9728ed2e763acbad883deb2d8bbdc1fe4aac1cfd134bdb00309", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fbd053afe4eaa9728ed2e763acbad883deb2d8bbdc1fe4aac1cfd134bdb00309", kill_on_drop: false }`
[INFO] [stdout] fbd053afe4eaa9728ed2e763acbad883deb2d8bbdc1fe4aac1cfd134bdb00309
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/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" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 73898121737e6df088f0a07ee0ea18436bb827d1b5a236cbe96fabad8df44ae3
[INFO] running `Command { std: "docker" "start" "-a" "73898121737e6df088f0a07ee0ea18436bb827d1b5a236cbe96fabad8df44ae3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling low v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `Command { std: "docker" "inspect" "73898121737e6df088f0a07ee0ea18436bb827d1b5a236cbe96fabad8df44ae3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73898121737e6df088f0a07ee0ea18436bb827d1b5a236cbe96fabad8df44ae3", kill_on_drop: false }`
[INFO] [stdout] 73898121737e6df088f0a07ee0ea18436bb827d1b5a236cbe96fabad8df44ae3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/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" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 07c6cde7b3ec28b92555c50afb91b795df7c5404cee25fe463a36c7cfe5ac8a3
[INFO] running `Command { std: "docker" "start" "-a" "07c6cde7b3ec28b92555c50afb91b795df7c5404cee25fe463a36c7cfe5ac8a3", kill_on_drop: false }`
[INFO] [stderr]    Compiling low v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `Command { std: "docker" "inspect" "07c6cde7b3ec28b92555c50afb91b795df7c5404cee25fe463a36c7cfe5ac8a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07c6cde7b3ec28b92555c50afb91b795df7c5404cee25fe463a36c7cfe5ac8a3", kill_on_drop: false }`
[INFO] [stdout] 07c6cde7b3ec28b92555c50afb91b795df7c5404cee25fe463a36c7cfe5ac8a3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/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" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] e0582430d3d36e156fd98ef179de97e84e02b7eab8511f9313eb1b3c4f5ad1cf
[INFO] running `Command { std: "docker" "start" "-a" "e0582430d3d36e156fd98ef179de97e84e02b7eab8511f9313eb1b3c4f5ad1cf", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 4.71s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/low-ecb8b8d1c611cb32)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests low
[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" "e0582430d3d36e156fd98ef179de97e84e02b7eab8511f9313eb1b3c4f5ad1cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0582430d3d36e156fd98ef179de97e84e02b7eab8511f9313eb1b3c4f5ad1cf", kill_on_drop: false }`
[INFO] [stdout] e0582430d3d36e156fd98ef179de97e84e02b7eab8511f9313eb1b3c4f5ad1cf