[INFO] fetching crate muta-protocol 0.1.0-alpha.1...
[INFO] documenting muta-protocol-0.1.0-alpha.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate muta-protocol 0.1.0-alpha.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate muta-protocol 0.1.0-alpha.1 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate muta-protocol 0.1.0-alpha.1
[INFO] finished tweaking crates.io crate muta-protocol 0.1.0-alpha.1
[INFO] tweaked toml for crates.io crate muta-protocol 0.1.0-alpha.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded hasher v0.1.3
[INFO] [stderr]   Downloaded fixed-hash v0.5.2
[INFO] [stderr]   Downloaded cita_trie v2.0.0
[INFO] [stderr]   Downloaded ethbloom v0.5.3
[INFO] [stderr]   Downloaded impl-rlp v0.2.1
[INFO] [stderr]   Downloaded ethbloom v0.8.1
[INFO] [stderr]   Downloaded rustc-hex v2.1.0
[INFO] [stderr]   Downloaded crunchy v0.1.6
[INFO] [stderr]   Downloaded fixed-hash v0.2.5
[INFO] [stderr]   Downloaded ethereum-types-serialize v0.2.2
[INFO] [stderr]   Downloaded ethereum-types v0.4.2
[INFO] [stderr]   Downloaded creep v0.1.1
[INFO] [stderr]   Downloaded impl-serde v0.2.3
[INFO] [stderr]   Downloaded rlp v0.3.0
[INFO] [stderr]   Downloaded uint v0.4.1
[INFO] [stderr]   Downloaded rlp v0.4.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta-2020-08-29" "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] 33ae25a6a336511078817d9d9761ef659a9d8ef907329e386cbdcb393d9c126f
[INFO] running `Command { std: "docker" "start" "-a" "33ae25a6a336511078817d9d9761ef659a9d8ef907329e386cbdcb393d9c126f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "33ae25a6a336511078817d9d9761ef659a9d8ef907329e386cbdcb393d9c126f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33ae25a6a336511078817d9d9761ef659a9d8ef907329e386cbdcb393d9c126f", kill_on_drop: false }`
[INFO] [stdout] 33ae25a6a336511078817d9d9761ef659a9d8ef907329e386cbdcb393d9c126f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a6c8d778009e67faf7d54e1cb7142476244074e37ad46a4288a99ce0c6d6045d
[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" "a6c8d778009e67faf7d54e1cb7142476244074e37ad46a4288a99ce0c6d6045d", 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rustc-hex v2.1.0
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling heapsize v0.4.2
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking hashbrown v0.3.1
[INFO] [stderr]     Checking json v0.12.4
[INFO] [stderr]     Checking creep v0.1.1
[INFO] [stderr]    Compiling anyhow v1.0.32
[INFO] [stderr]     Checking num-bigint v0.2.6
[INFO] [stderr]     Checking serde v1.0.115
[INFO] [stderr]     Checking parking_lot_core v0.5.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking rlp v0.4.5
[INFO] [stderr]     Checking parking_lot v0.8.0
[INFO] [stderr]     Checking impl-rlp v0.2.1
[INFO] [stderr]    Compiling prost-derive v0.6.1
[INFO] [stderr]     Checking tiny-keccak v1.5.0
[INFO] [stderr]     Checking fixed-hash v0.2.5
[INFO] [stderr]     Checking uint v0.4.1
[INFO] [stderr]     Checking hasher v0.1.3
[INFO] [stderr]     Checking fixed-hash v0.5.2
[INFO] [stderr]     Checking prost v0.6.1
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]    Compiling derive_more v0.15.0
[INFO] [stderr]     Checking ethereum-types-serialize v0.2.2
[INFO] [stderr]     Checking impl-serde v0.2.3
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking ethbloom v0.8.1
[INFO] [stderr]     Checking ethbloom v0.5.3
[INFO] [stderr]     Checking ethereum-types v0.4.2
[INFO] [stderr]     Checking rlp v0.3.0
[INFO] [stderr]     Checking cita_trie v2.0.0
[INFO] [stderr]  Documenting muta-protocol v0.1.0-alpha.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![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 `muta-protocol`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name muta_protocol 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 async_trait=/opt/rustwide/target/debug/deps/libasync_trait-a329ddad9d6e2816.so --extern bincode=/opt/rustwide/target/debug/deps/libbincode-37420d45cd2ee6f0.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-364c148656283980.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-c5714e68d7e46dbf.rmeta --extern cita_trie=/opt/rustwide/target/debug/deps/libcita_trie-16dcba278c4b8e3f.rmeta --extern creep=/opt/rustwide/target/debug/deps/libcreep-931c1f7752ebde1e.rmeta --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-9a20d05da7e6165a.so --extern ethbloom=/opt/rustwide/target/debug/deps/libethbloom-664a8b178ddc36e8.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-6dc9766a41700476.rmeta --extern hasher=/opt/rustwide/target/debug/deps/libhasher-77266153cff4bbb0.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-cbe711c317509ff5.rmeta --extern json=/opt/rustwide/target/debug/deps/libjson-358ec06c6fad0497.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-db88f49d9e5662e7.rmeta --extern num_bigint=/opt/rustwide/target/debug/deps/libnum_bigint-33514ca164ff6d8f.rmeta --extern prost=/opt/rustwide/target/debug/deps/libprost-67cd374678dedf47.rmeta --extern rlp=/opt/rustwide/target/debug/deps/librlp-a7cca13889a7829b.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-0b7f9eeb98717e9f.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-115676c13c037203.rmeta --cap-lints=warn --crate-version 0.1.0-alpha.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "a6c8d778009e67faf7d54e1cb7142476244074e37ad46a4288a99ce0c6d6045d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6c8d778009e67faf7d54e1cb7142476244074e37ad46a4288a99ce0c6d6045d", kill_on_drop: false }`
[INFO] [stdout] a6c8d778009e67faf7d54e1cb7142476244074e37ad46a4288a99ce0c6d6045d