[INFO] fetching crate overlord 0.2.0-alpha.13...
[INFO] documenting overlord-0.2.0-alpha.13 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate overlord 0.2.0-alpha.13 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate overlord 0.2.0-alpha.13 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 overlord 0.2.0-alpha.13
[INFO] finished tweaking crates.io crate overlord 0.2.0-alpha.13
[INFO] tweaked toml for crates.io crate overlord 0.2.0-alpha.13 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate crates.io crate overlord 0.2.0-alpha.13 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] c0902f28bb3ea3bb6fe0ca210e5f66c90a82b44632b22b3e3c480c92933e39c2
[INFO] running `Command { std: "docker" "start" "-a" "c0902f28bb3ea3bb6fe0ca210e5f66c90a82b44632b22b3e3c480c92933e39c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c0902f28bb3ea3bb6fe0ca210e5f66c90a82b44632b22b3e3c480c92933e39c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0902f28bb3ea3bb6fe0ca210e5f66c90a82b44632b22b3e3c480c92933e39c2", kill_on_drop: false }`
[INFO] [stdout] c0902f28bb3ea3bb6fe0ca210e5f66c90a82b44632b22b3e3c480c92933e39c2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 597f36a05d9828d446546e2202aafb45cbe0237ffe2eeb83d116d18c21895e0c
[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" "597f36a05d9828d446546e2202aafb45cbe0237ffe2eeb83d116d18c21895e0c", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-core v0.3.4
[INFO] [stderr]     Checking futures-sink v0.3.4
[INFO] [stderr]     Checking rustc-hex v2.1.0
[INFO] [stderr]     Checking dyn-clone v1.0.1
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking parking_lot_core v0.7.0
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]     Checking creep v0.2.2
[INFO] [stderr]     Checking rlp v0.4.4
[INFO] [stderr]     Checking parking_lot v0.10.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking libmath v0.1.4
[INFO] [stderr]     Checking prime_tools v0.2.2
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling tokio-macros v0.2.4
[INFO] [stderr]    Compiling async-trait v0.1.24
[INFO] [stderr]    Compiling derive_more v0.99.3
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking serde v1.0.104
[INFO] [stderr]     Checking bytes v0.5.4
[INFO] [stderr]     Checking serde_json v1.0.48
[INFO] [stderr]     Checking tokio v0.2.11
[INFO] [stderr]     Checking moodyblues-sdk v0.3.0
[INFO] [stderr]  Documenting overlord v0.2.0-alpha.13 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(test)]
[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 `overlord`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name overlord 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 async_trait=/opt/rustwide/target/debug/deps/libasync_trait-bb87bc60eb50a589.so --extern bit_vec=/opt/rustwide/target/debug/deps/libbit_vec-bbb1bc601bffad4b.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-1e57189089cd9f76.rmeta --extern creep=/opt/rustwide/target/debug/deps/libcreep-398052637c1e9278.rmeta --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-273b0a354497c0b4.so --extern futures=/opt/rustwide/target/debug/deps/libfutures-22b91fad47833e9d.rmeta --extern futures_timer=/opt/rustwide/target/debug/deps/libfutures_timer-742588ea2d39983e.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-88b93a2a096ee79e.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-f96ba0118540bef9.rmeta --extern moodyblues_sdk=/opt/rustwide/target/debug/deps/libmoodyblues_sdk-34b8bec4022e6ed0.rmeta --extern parking_lot=/opt/rustwide/target/debug/deps/libparking_lot-5733a94384d7088b.rmeta --extern prime_tools=/opt/rustwide/target/debug/deps/libprime_tools-a1c5807affe51624.rmeta --extern rand_core=/opt/rustwide/target/debug/deps/librand_core-ee56458823117635.rmeta --extern rand_pcg=/opt/rustwide/target/debug/deps/librand_pcg-eebdf321be4c8963.rmeta --extern rlp=/opt/rustwide/target/debug/deps/librlp-5f4fc25a40dba0c2.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-2c7fa9b1468662d0.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-8c0506dd2ce580e8.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-f843424b60d0adb5.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-b8475991cf54dfc8.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "597f36a05d9828d446546e2202aafb45cbe0237ffe2eeb83d116d18c21895e0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "597f36a05d9828d446546e2202aafb45cbe0237ffe2eeb83d116d18c21895e0c", kill_on_drop: false }`
[INFO] [stdout] 597f36a05d9828d446546e2202aafb45cbe0237ffe2eeb83d116d18c21895e0c