[INFO] cloning repository https://github.com/iovxw/cobble
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iovxw/cobble" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Fcobble", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Fcobble'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2f03cac83c57afd8b290400268ebe033a1023d9e
[INFO] testing iovxw/cobble against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiovxw%2Fcobble" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iovxw/cobble 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 git repo https://github.com/iovxw/cobble
[INFO] finished tweaking git repo https://github.com/iovxw/cobble
[INFO] tweaked toml for git repo https://github.com/iovxw/cobble written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/iovxw/cobble 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 rpassword v2.1.0
[INFO] [stderr]   Downloaded openssl-sys v0.9.39
[INFO] [stderr]   Downloaded crc32fast v1.1.2
[INFO] [stderr]   Downloaded curl v0.4.19
[INFO] [stderr]   Downloaded miniz-sys v0.1.11
[INFO] [stderr]   Downloaded rustc-demangle v0.1.10
[INFO] [stderr]   Downloaded curl-sys v0.4.15
[INFO] [stderr]   Downloaded netbuf v0.4.1
[INFO] [stderr]   Downloaded heck v0.3.0
[INFO] [stderr]   Downloaded miniz_oxide v0.2.0
[INFO] [stderr]   Downloaded miniz_oxide_c_api v0.2.0
[INFO] [stderr]   Downloaded flate2 v1.0.6
[INFO] [stderr]   Downloaded openssl v0.10.15
[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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4e34338d0789e3cf38a23c7631e48d95b5df1e071fbb8438299920556986bd61
[INFO] running `Command { std: "docker" "start" "-a" "4e34338d0789e3cf38a23c7631e48d95b5df1e071fbb8438299920556986bd61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4e34338d0789e3cf38a23c7631e48d95b5df1e071fbb8438299920556986bd61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e34338d0789e3cf38a23c7631e48d95b5df1e071fbb8438299920556986bd61", kill_on_drop: false }`
[INFO] [stdout] 4e34338d0789e3cf38a23c7631e48d95b5df1e071fbb8438299920556986bd61
[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" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c70b2e76e9eabe398b3ffb957b05b2677aee11e7fa1c2db8e5dc595f8e04845a
[INFO] running `Command { std: "docker" "start" "-a" "c70b2e76e9eabe398b3ffb957b05b2677aee11e7fa1c2db8e5dc595f8e04845a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling pkg-config v0.3.14
[INFO] [stderr]    Compiling crc32fast v1.1.2
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling serde v1.0.82
[INFO] [stderr]    Compiling bitflags v1.0.4
[INFO] [stderr]    Compiling openssl v0.10.15
[INFO] [stderr]    Compiling unicode-segmentation v1.2.1
[INFO] [stderr]    Compiling rustc-demangle v0.1.10
[INFO] [stderr]    Compiling itoa v0.4.3
[INFO] [stderr]    Compiling lazy_static v1.2.0
[INFO] [stderr]    Compiling byteorder v1.2.7
[INFO] [stderr]    Compiling netbuf v0.4.1
[INFO] [stderr]    Compiling miniz-sys v0.1.11
[INFO] [stderr]    Compiling textwrap v0.10.0
[INFO] [stderr]    Compiling socket2 v0.3.8
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling rpassword v2.1.0
[INFO] [stderr]    Compiling syn v0.15.22
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling heck v0.3.0
[INFO] [stderr]    Compiling error-chain v0.12.0
[INFO] [stderr]    Compiling openssl-sys v0.9.39
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling curl-sys v0.4.15
[INFO] [stderr]    Compiling flate2 v1.0.6
[INFO] [stderr]    Compiling serde_derive v1.0.82
[INFO] [stderr]    Compiling structopt-derive v0.2.14
[INFO] [stderr]    Compiling structopt v0.2.14
[INFO] [stderr]    Compiling curl v0.4.19
[INFO] [stderr]    Compiling serde_json v1.0.33
[INFO] [stderr]    Compiling ozelot v0.8.0 (https://github.com/C4K3/Ozelot.git#e208e440)
[INFO] [stderr]    Compiling cobble v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `slice_patterns` has been stable since 1.42.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cobble` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "c70b2e76e9eabe398b3ffb957b05b2677aee11e7fa1c2db8e5dc595f8e04845a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c70b2e76e9eabe398b3ffb957b05b2677aee11e7fa1c2db8e5dc595f8e04845a", kill_on_drop: false }`
[INFO] [stdout] c70b2e76e9eabe398b3ffb957b05b2677aee11e7fa1c2db8e5dc595f8e04845a