[INFO] fetching crate slings 0.3.0...
[INFO] testing slings-0.3.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate slings 0.3.0 into /workspace/builds/worker-53/source
[INFO] validating manifest of crates.io crate slings 0.3.0 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 slings 0.3.0
[INFO] finished tweaking crates.io crate slings 0.3.0
[INFO] tweaked toml for crates.io crate slings 0.3.0 written to /workspace/builds/worker-53/source/Cargo.toml
[INFO] crate crates.io crate slings 0.3.0 already has a lockfile, it will not be regenerated
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded io-uring v0.5.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/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] a0230ed58b57acd8d9e3721df9216dc884b21bf32f2b8169ed4eac40972de262
[INFO] running `Command { std: "docker" "start" "-a" "a0230ed58b57acd8d9e3721df9216dc884b21bf32f2b8169ed4eac40972de262", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a0230ed58b57acd8d9e3721df9216dc884b21bf32f2b8169ed4eac40972de262", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0230ed58b57acd8d9e3721df9216dc884b21bf32f2b8169ed4eac40972de262", kill_on_drop: false }`
[INFO] [stdout] a0230ed58b57acd8d9e3721df9216dc884b21bf32f2b8169ed4eac40972de262
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/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] 6b551d9cdcf0a12c32c1553193a01d5f92d03661752ca57ffaadc8098564f686
[INFO] running `Command { std: "docker" "start" "-a" "6b551d9cdcf0a12c32c1553193a01d5f92d03661752ca57ffaadc8098564f686", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-core v0.3.15
[INFO] [stderr]    Compiling futures-task v0.3.15
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling io-uring v0.5.1
[INFO] [stderr]    Compiling futures-io v0.3.15
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.6
[INFO] [stderr]    Compiling slab v0.4.3
[INFO] [stderr]    Compiling scoped-tls v1.0.0
[INFO] [stderr]    Compiling async-task v4.0.3
[INFO] [stderr]    Compiling futures-util v0.3.15
[INFO] [stderr]    Compiling slings v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.66s
[INFO] running `Command { std: "docker" "inspect" "6b551d9cdcf0a12c32c1553193a01d5f92d03661752ca57ffaadc8098564f686", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b551d9cdcf0a12c32c1553193a01d5f92d03661752ca57ffaadc8098564f686", kill_on_drop: false }`
[INFO] [stdout] 6b551d9cdcf0a12c32c1553193a01d5f92d03661752ca57ffaadc8098564f686
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/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] 44167e20089160f1a67f6da386693f04c2c227651cd4327260a6ac1ce09779ec
[INFO] running `Command { std: "docker" "start" "-a" "44167e20089160f1a67f6da386693f04c2c227651cd4327260a6ac1ce09779ec", kill_on_drop: false }`
[INFO] [stderr]    Compiling slings v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `Command { std: "docker" "inspect" "44167e20089160f1a67f6da386693f04c2c227651cd4327260a6ac1ce09779ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44167e20089160f1a67f6da386693f04c2c227651cd4327260a6ac1ce09779ec", kill_on_drop: false }`
[INFO] [stdout] 44167e20089160f1a67f6da386693f04c2c227651cd4327260a6ac1ce09779ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/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] 9f9addcfacd33e311b6f3ffa33645c5daa996397d2b2dcece72b51e84b9a1ca8
[INFO] running `Command { std: "docker" "start" "-a" "9f9addcfacd33e311b6f3ffa33645c5daa996397d2b2dcece72b51e84b9a1ca8", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/slings-e895044e7d1a3019)
[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]    Doc-tests slings
[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" "9f9addcfacd33e311b6f3ffa33645c5daa996397d2b2dcece72b51e84b9a1ca8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f9addcfacd33e311b6f3ffa33645c5daa996397d2b2dcece72b51e84b9a1ca8", kill_on_drop: false }`
[INFO] [stdout] 9f9addcfacd33e311b6f3ffa33645c5daa996397d2b2dcece72b51e84b9a1ca8