[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] documenting iovxw/cobble against 1.46.0 for beta-1.47-rustdoc-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 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", 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" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 500b47eaf943b7cba6a215e476173f1bbe333a4d2f61b922df9cbe504e59110a
[INFO] running `Command { std: "docker" "start" "-a" "500b47eaf943b7cba6a215e476173f1bbe333a4d2f61b922df9cbe504e59110a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "500b47eaf943b7cba6a215e476173f1bbe333a4d2f61b922df9cbe504e59110a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "500b47eaf943b7cba6a215e476173f1bbe333a4d2f61b922df9cbe504e59110a", kill_on_drop: false }`
[INFO] [stdout] 500b47eaf943b7cba6a215e476173f1bbe333a4d2f61b922df9cbe504e59110a
[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" "RUSTDOCFLAGS=--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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] df42798e976d8dccfcf60e359a544d32dcc4957dc0fdd4e0f2966adb3f2b8650
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "df42798e976d8dccfcf60e359a544d32dcc4957dc0fdd4e0f2966adb3f2b8650", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.26
[INFO] [stderr]    Compiling libc v0.2.45
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling crc32fast v1.1.2
[INFO] [stderr]    Compiling serde v1.0.82
[INFO] [stderr]     Checking rustc-demangle v0.1.10
[INFO] [stderr]    Compiling unicode-segmentation v1.2.1
[INFO] [stderr]    Compiling openssl v0.10.15
[INFO] [stderr]     Checking byteorder v1.2.7
[INFO] [stderr]     Checking netbuf v0.4.1
[INFO] [stderr]    Compiling heck v0.3.0
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]     Checking socket2 v0.3.8
[INFO] [stderr]     Checking rpassword v2.1.0
[INFO] [stderr]    Compiling openssl-sys v0.9.39
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling backtrace-sys v0.1.26
[INFO] [stderr]    Compiling miniz-sys v0.1.11
[INFO] [stderr]    Compiling curl-sys v0.4.15
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]    Compiling syn v0.15.22
[INFO] [stderr]     Checking flate2 v1.0.6
[INFO] [stderr]     Checking backtrace v0.3.13
[INFO] [stderr]     Checking error-chain v0.12.0
[INFO] [stderr]    Compiling serde_derive v1.0.82
[INFO] [stderr]    Compiling structopt-derive v0.2.14
[INFO] [stderr]     Checking structopt v0.2.14
[INFO] [stderr]     Checking curl v0.4.19
[INFO] [stderr]     Checking serde_json v1.0.33
[INFO] [stderr]     Checking ozelot v0.8.0 (https://github.com/C4K3/Ozelot.git#e208e440)
[INFO] [stderr]  Documenting 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]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `cobble`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name cobble src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern ozelot=/opt/rustwide/target/debug/deps/libozelot-60e3cfc575fa6811.rmeta --extern rpassword=/opt/rustwide/target/debug/deps/librpassword-4e87640b1942b729.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-80daaa18e19a2bfa.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-b0ffc085acc22167.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-40a840b9fef9423e.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "df42798e976d8dccfcf60e359a544d32dcc4957dc0fdd4e0f2966adb3f2b8650", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df42798e976d8dccfcf60e359a544d32dcc4957dc0fdd4e0f2966adb3f2b8650", kill_on_drop: false }`
[INFO] [stdout] df42798e976d8dccfcf60e359a544d32dcc4957dc0fdd4e0f2966adb3f2b8650