[INFO] fetching crate standback 0.4.0...
[INFO] testing standback-0.4.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate standback 0.4.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate standback 0.4.0 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 standback 0.4.0
[INFO] finished tweaking crates.io crate standback 0.4.0
[INFO] tweaked toml for crates.io crate standback 0.4.0 written to /workspace/builds/worker-7/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]  Downloading crates ...
[INFO] [stderr]   Downloaded easy-ext v1.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 0964fb13bba473e5a32a8907df70ea79bb25347dbae63373aa61a6bec79f3a7e
[INFO] running `Command { std: "docker" "start" "-a" "0964fb13bba473e5a32a8907df70ea79bb25347dbae63373aa61a6bec79f3a7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0964fb13bba473e5a32a8907df70ea79bb25347dbae63373aa61a6bec79f3a7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0964fb13bba473e5a32a8907df70ea79bb25347dbae63373aa61a6bec79f3a7e", kill_on_drop: false }`
[INFO] [stdout] 0964fb13bba473e5a32a8907df70ea79bb25347dbae63373aa61a6bec79f3a7e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 53ee2f1b369f5b1900a6fb070f043042d2afe743ce1248d9db0ace2ab59b7b26
[INFO] running `Command { std: "docker" "start" "-a" "53ee2f1b369f5b1900a6fb070f043042d2afe743ce1248d9db0ace2ab59b7b26", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling easy-ext v1.0.0
[INFO] [stderr]    Compiling standback v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.39s
[INFO] running `Command { std: "docker" "inspect" "53ee2f1b369f5b1900a6fb070f043042d2afe743ce1248d9db0ace2ab59b7b26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53ee2f1b369f5b1900a6fb070f043042d2afe743ce1248d9db0ace2ab59b7b26", kill_on_drop: false }`
[INFO] [stdout] 53ee2f1b369f5b1900a6fb070f043042d2afe743ce1248d9db0ace2ab59b7b26
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] aaaba691c551d5f5d81d995fc594deda8e2bf7bee0ebc55436604e27719d2ab9
[INFO] running `Command { std: "docker" "start" "-a" "aaaba691c551d5f5d81d995fc594deda8e2bf7bee0ebc55436604e27719d2ab9", kill_on_drop: false }`
[INFO] [stderr]    Compiling standback v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `Command { std: "docker" "inspect" "aaaba691c551d5f5d81d995fc594deda8e2bf7bee0ebc55436604e27719d2ab9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aaaba691c551d5f5d81d995fc594deda8e2bf7bee0ebc55436604e27719d2ab9", kill_on_drop: false }`
[INFO] [stdout] aaaba691c551d5f5d81d995fc594deda8e2bf7bee0ebc55436604e27719d2ab9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] d2b6faf99ed87b02639119a9d511b2e7dd4296586fd1b0f32a7c866d68247edd
[INFO] running `Command { std: "docker" "start" "-a" "d2b6faf99ed87b02639119a9d511b2e7dd4296586fd1b0f32a7c866d68247edd", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/standback-468532c9ad08636c)
[INFO] [stdout] running 0 tests
[INFO] [stderr]    Doc-tests standback
[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 2 tests
[INFO] [stdout] test src/lib.rs - (line 17) - compile ... ok
[INFO] [stdout] test src/lib.rs - (line 24) - compile ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.17s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d2b6faf99ed87b02639119a9d511b2e7dd4296586fd1b0f32a7c866d68247edd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2b6faf99ed87b02639119a9d511b2e7dd4296586fd1b0f32a7c866d68247edd", kill_on_drop: false }`
[INFO] [stdout] d2b6faf99ed87b02639119a9d511b2e7dd4296586fd1b0f32a7c866d68247edd