[INFO] fetching crate flv-api-sc 1.2.0...
[INFO] documenting flv-api-sc-1.2.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate flv-api-sc 1.2.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate flv-api-sc 1.2.0 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 flv-api-sc 1.2.0
[INFO] finished tweaking crates.io crate flv-api-sc 1.2.0
[INFO] tweaked toml for crates.io crate flv-api-sc 1.2.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] d93c42f6f3d0bc7af2ae451ee8b8e776deb87347af1324703c8d75f48ffeddf7
[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" "d93c42f6f3d0bc7af2ae451ee8b8e776deb87347af1324703c8d75f48ffeddf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d93c42f6f3d0bc7af2ae451ee8b8e776deb87347af1324703c8d75f48ffeddf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d93c42f6f3d0bc7af2ae451ee8b8e776deb87347af1324703c8d75f48ffeddf7", kill_on_drop: false }`
[INFO] [stdout] d93c42f6f3d0bc7af2ae451ee8b8e776deb87347af1324703c8d75f48ffeddf7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 81e97b1fb055d551a88e7f2139c03ba3eff14281d4225b708ddcc4171a327361
[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" "81e97b1fb055d551a88e7f2139c03ba3eff14281d4225b708ddcc4171a327361", kill_on_drop: false }`
[INFO] [stderr]    Compiling crc32c v0.4.0
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking tracing-log v0.1.1
[INFO] [stderr]     Checking flv-types v0.1.0
[INFO] [stderr]     Checking flv-types v0.2.2
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]    Compiling kf-protocol-derive v0.1.1
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking async-io v1.1.10
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking error-chain v0.12.4
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]    Compiling tracing-attributes v0.1.11
[INFO] [stderr]     Checking tracing-serde v0.1.2
[INFO] [stderr]     Checking futures-executor v0.3.6
[INFO] [stderr]     Checking serde_qs v0.4.6
[INFO] [stderr]     Checking http v0.1.21
[INFO] [stderr]     Checking futures v0.3.6
[INFO] [stderr]     Checking async-global-executor v1.4.0
[INFO] [stderr]     Checking async-std v1.6.5
[INFO] [stderr]     Checking k8-obj-metadata v1.0.0
[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]     Checking flv-util v0.1.1
[INFO] [stderr]     Checking flv-util v0.2.1
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking flv-k8-partition v1.0.0
[INFO] [stderr]     Checking flv-k8-topic v1.0.0
[INFO] [stderr]     Checking k8-obj-core v1.1.0
[INFO] [stderr]     Checking tracing v0.1.21
[INFO] [stderr]     Checking tracing-subscriber v0.2.13
[INFO] [stderr]     Checking kf-protocol-core v0.1.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/kf-protocol-core-0.1.2/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kf-protocol-core`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "81e97b1fb055d551a88e7f2139c03ba3eff14281d4225b708ddcc4171a327361", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81e97b1fb055d551a88e7f2139c03ba3eff14281d4225b708ddcc4171a327361", kill_on_drop: false }`
[INFO] [stdout] 81e97b1fb055d551a88e7f2139c03ba3eff14281d4225b708ddcc4171a327361
