[INFO] fetching crate overlord 0.2.1...
[INFO] documenting overlord-0.2.1 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate overlord 0.2.1 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate overlord 0.2.1 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate overlord 0.2.1
[INFO] finished tweaking crates.io crate overlord 0.2.1
[INFO] tweaked toml for crates.io crate overlord 0.2.1 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate overlord 0.2.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "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-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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c1963ebf7eb101ed52e1bfaf400d9da997e592ea9b6cde5ed5150365cc7936e9
[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" "c1963ebf7eb101ed52e1bfaf400d9da997e592ea9b6cde5ed5150365cc7936e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c1963ebf7eb101ed52e1bfaf400d9da997e592ea9b6cde5ed5150365cc7936e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1963ebf7eb101ed52e1bfaf400d9da997e592ea9b6cde5ed5150365cc7936e9", kill_on_drop: false }`
[INFO] [stdout] c1963ebf7eb101ed52e1bfaf400d9da997e592ea9b6cde5ed5150365cc7936e9
[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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7e092e0f4ee43efe12a380ba6fcfdad6ecd743eb0a9e702aa3479f7e173cdb99
[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" "7e092e0f4ee43efe12a380ba6fcfdad6ecd743eb0a9e702aa3479f7e173cdb99", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.31
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling serde v1.0.112
[INFO] [stderr]     Checking adler32 v1.1.0
[INFO] [stderr]     Checking gimli v0.21.0
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]    Compiling serde_json v1.0.55
[INFO] [stderr]     Checking bit-vec v0.6.2
[INFO] [stderr]     Checking hex v0.4.2
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]     Checking creep v0.2.2
[INFO] [stderr]     Checking rlp v0.4.5
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]     Checking miniz_oxide v0.3.7
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking crossbeam-channel v0.4.2
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking hostname v0.3.1
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking libmath v0.1.4
[INFO] [stderr]     Checking prime_tools v0.2.2
[INFO] [stderr]     Checking addr2line v0.12.1
[INFO] [stderr]     Checking backtrace v0.3.49
[INFO] [stderr]    Compiling serde_derive v1.0.112
[INFO] [stderr]    Compiling trackable_derive v0.1.3
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling async-trait v0.1.36
[INFO] [stderr]    Compiling derive_more v0.99.8
[INFO] [stderr]     Checking trackable v0.2.23
[INFO] [stderr]     Checking thrift_codec v0.1.1
[INFO] [stderr]     Checking rustracing v0.4.0
[INFO] [stderr]     Checking rustracing_jaeger v0.4.1
[INFO] [stderr]     Checking pin-project v0.4.22
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking bytes v0.5.5
[INFO] [stderr]     Checking tokio v0.2.21
[INFO] [stderr]    Compiling muta-apm-derive v0.1.0-alpha.12
[INFO] [stderr]     Checking muta-apm v0.1.0-alpha.15
[INFO] [stderr]  Documenting overlord v0.2.1 (/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-ed8aee1519a59e7a.so --extern bit_vec=/opt/rustwide/target/debug/deps/libbit_vec-ce4a0e37d1a40094.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-03b2373b7ef3f836.rmeta --extern creep=/opt/rustwide/target/debug/deps/libcreep-d5263dae065dc387.rmeta --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-57b45cc2c9daf59c.so --extern futures=/opt/rustwide/target/debug/deps/libfutures-added58335d1658f.rmeta --extern futures_timer=/opt/rustwide/target/debug/deps/libfutures_timer-c01baecaf3d306ba.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-9b9149e9f18db67f.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-1b53669f640bf8d7.rmeta --extern muta_apm=/opt/rustwide/target/debug/deps/libmuta_apm-abd4d4f82462c9e8.rmeta --extern parking_lot=/opt/rustwide/target/debug/deps/libparking_lot-43d7a5607922a06b.rmeta --extern prime_tools=/opt/rustwide/target/debug/deps/libprime_tools-9dd522646d978cb1.rmeta --extern rand_core=/opt/rustwide/target/debug/deps/librand_core-832bec7160c825c6.rmeta --extern rand_pcg=/opt/rustwide/target/debug/deps/librand_pcg-d1253463399f045d.rmeta --extern rlp=/opt/rustwide/target/debug/deps/librlp-59bfd30284816f00.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-bf567936ce7ffcd5.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-d8822953dd7ee62d.so --extern tokio=/opt/rustwide/target/debug/deps/libtokio-9f978f7fbefc0243.rmeta --cap-lints=warn --crate-version 0.2.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "7e092e0f4ee43efe12a380ba6fcfdad6ecd743eb0a9e702aa3479f7e173cdb99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e092e0f4ee43efe12a380ba6fcfdad6ecd743eb0a9e702aa3479f7e173cdb99", kill_on_drop: false }`
[INFO] [stdout] 7e092e0f4ee43efe12a380ba6fcfdad6ecd743eb0a9e702aa3479f7e173cdb99
