[INFO] fetching crate keel 0.0.1...
[INFO] documenting keel-0.0.1 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate keel 0.0.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate keel 0.0.1 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 keel 0.0.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate keel 0.0.1
[INFO] tweaked toml for crates.io crate keel 0.0.1 written to /workspace/builds/worker-4/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] [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 2a1d0d1331b8a7c5f3ba270ffefec8b49e17a1f326267856d6b3077d6f87045d
[INFO] running `Command { std: "docker" "start" "-a" "2a1d0d1331b8a7c5f3ba270ffefec8b49e17a1f326267856d6b3077d6f87045d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a1d0d1331b8a7c5f3ba270ffefec8b49e17a1f326267856d6b3077d6f87045d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a1d0d1331b8a7c5f3ba270ffefec8b49e17a1f326267856d6b3077d6f87045d", kill_on_drop: false }`
[INFO] [stdout] 2a1d0d1331b8a7c5f3ba270ffefec8b49e17a1f326267856d6b3077d6f87045d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] fb3ec0df0b6315b2f7fd71f79c8f433185baf5498fdb7888cb0826f46ca10e96
[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" "fb3ec0df0b6315b2f7fd71f79c8f433185baf5498fdb7888cb0826f46ca10e96", 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] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] [stderr]    Compiling k8s-openapi v0.2.0
[INFO] [stderr]     Checking serde_yaml v0.7.5
[INFO] [stderr]     Checking want v0.2.0
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking native-tls v0.2.4
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-codec v0.1.2
[INFO] [stderr]     Checking tokio-fs v0.1.7
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]     Checking tokio-uds v0.2.7
[INFO] [stderr]     Checking tokio-udp v0.1.6
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking tokio-core v0.1.17
[INFO] [stderr]     Checking hyper v0.12.35
[INFO] [stderr]     Checking hyper-tls v0.3.2
[INFO] [stderr]  Documenting keel v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(custom_attribute)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: removed in favor of `#![register_tool]` and `#![register_attr]`
[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(uniform_paths)]
[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(custom_attribute)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `keel`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name keel src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern base64=/opt/rustwide/target/debug/deps/libbase64-49de4105eb347adf.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-431bdcc162998b76.rmeta --extern dirs=/opt/rustwide/target/debug/deps/libdirs-7e64f6dca7ea7b5c.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-d9fcd1e065ee1e23.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-29a973654112bb9d.rmeta --extern http=/opt/rustwide/target/debug/deps/libhttp-7aeccab42f2b4a17.rmeta --extern hyper=/opt/rustwide/target/debug/deps/libhyper-039e07fb2c7d61c2.rmeta --extern hyper_tls=/opt/rustwide/target/debug/deps/libhyper_tls-d778912da228e55c.rmeta --extern k8s_openapi=/opt/rustwide/target/debug/deps/libk8s_openapi-47e8c22bbd86c1fd.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-958bf2a074a4960f.rmeta --extern native_tls=/opt/rustwide/target/debug/deps/libnative_tls-8536384412a48aea.rmeta --extern openssl=/opt/rustwide/target/debug/deps/libopenssl-a0735bb4888fa945.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-5429dd6d097468fb.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-3af9a6345491720f.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-6755a24efcfc79e1.rmeta --extern serde_urlencoded=/opt/rustwide/target/debug/deps/libserde_urlencoded-065296f23f0e7ee2.rmeta --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-93caca54182dfcb7.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-2a0b458e8f00cefd.rmeta --extern tokio_core=/opt/rustwide/target/debug/deps/libtokio_core-b7c5f2d4c23db638.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-1216b9cbfa590ac0.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "fb3ec0df0b6315b2f7fd71f79c8f433185baf5498fdb7888cb0826f46ca10e96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb3ec0df0b6315b2f7fd71f79c8f433185baf5498fdb7888cb0826f46ca10e96", kill_on_drop: false }`
[INFO] [stdout] fb3ec0df0b6315b2f7fd71f79c8f433185baf5498fdb7888cb0826f46ca10e96