[INFO] fetching crate catt-core 0.1.0...
[INFO] documenting catt-core-0.1.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate catt-core 0.1.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate catt-core 0.1.0 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 crates.io crate catt-core 0.1.0
[INFO] finished tweaking crates.io crate catt-core 0.1.0
[INFO] tweaked toml for crates.io crate catt-core 0.1.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] [stdout] 2a74fc1a3d57c3a2ea2bff1440921e0d2c4945a8ab4b8e1d38357822d6f20d7f
[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" "2a74fc1a3d57c3a2ea2bff1440921e0d2c4945a8ab4b8e1d38357822d6f20d7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a74fc1a3d57c3a2ea2bff1440921e0d2c4945a8ab4b8e1d38357822d6f20d7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a74fc1a3d57c3a2ea2bff1440921e0d2c4945a8ab4b8e1d38357822d6f20d7f", kill_on_drop: false }`
[INFO] [stdout] 2a74fc1a3d57c3a2ea2bff1440921e0d2c4945a8ab4b8e1d38357822d6f20d7f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 90099541bd5bc9b49934bd4935368d2d2c313d1b279d7500b8bf324dee11d48e
[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" "90099541bd5bc9b49934bd4935368d2d2c313d1b279d7500b8bf324dee11d48e", kill_on_drop: false }`
[INFO] [stderr]     Checking toml v0.2.1
[INFO] [stderr]     Checking tokio-core v0.1.17
[INFO] [stderr]  Documenting catt-core v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `tokio_core::channel`
[INFO] [stdout]  --> src/bus.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use tokio_core::channel::Receiver;
[INFO] [stdout]   |                 ^^^^^^^ could not find `channel` in `tokio_core`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `tokio_core::channel`
[INFO] [stdout]  --> src/binding.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use tokio_core::channel::Receiver;
[INFO] [stdout]   |                 ^^^^^^^ could not find `channel` in `tokio_core`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(conservative_impl_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(question_mark)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `catt-core`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name catt_core src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-adede747e00f61a9.rmeta --extern error_chain=/opt/rustwide/target/debug/deps/liberror_chain-f995848bdc22a980.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-29a973654112bb9d.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-538ccf74a4ec0a82.rmeta --extern rustc_serialize=/opt/rustwide/target/debug/deps/librustc_serialize-0e355727854478f2.rmeta --extern tokio_core=/opt/rustwide/target/debug/deps/libtokio_core-802733ff261bdc51.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-aaaa03db4559d2e7.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "90099541bd5bc9b49934bd4935368d2d2c313d1b279d7500b8bf324dee11d48e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90099541bd5bc9b49934bd4935368d2d2c313d1b279d7500b8bf324dee11d48e", kill_on_drop: false }`
[INFO] [stdout] 90099541bd5bc9b49934bd4935368d2d2c313d1b279d7500b8bf324dee11d48e