[INFO] fetching crate tcpclient 1.3.1...
[INFO] documenting tcpclient-1.3.1 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate tcpclient 1.3.1 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate tcpclient 1.3.1 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tcpclient 1.3.1
[INFO] finished tweaking crates.io crate tcpclient 1.3.1
[INFO] tweaked toml for crates.io crate tcpclient 1.3.1 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8a950ed249ab7cf32d073e321a022acc8ce9d6b4fde87d8df6f1afff196e93e5
[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" "8a950ed249ab7cf32d073e321a022acc8ce9d6b4fde87d8df6f1afff196e93e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8a950ed249ab7cf32d073e321a022acc8ce9d6b4fde87d8df6f1afff196e93e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a950ed249ab7cf32d073e321a022acc8ce9d6b4fde87d8df6f1afff196e93e5", kill_on_drop: false }`
[INFO] [stdout] 8a950ed249ab7cf32d073e321a022acc8ce9d6b4fde87d8df6f1afff196e93e5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", 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] 8eeaf840b7ec76dc1efcc40d8acc3a42700ed5de138f75e4585af36f8c738572
[INFO] running `Command { std: "docker" "start" "-a" "8eeaf840b7ec76dc1efcc40d8acc3a42700ed5de138f75e4585af36f8c738572", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-micro v0.5.0
[INFO] [stderr]    Compiling tokio v1.9.0
[INFO] [stderr]     Checking async-oneshot v0.5.0
[INFO] [stderr]     Checking aqueue v1.1.3
[INFO] [stderr]  Documenting tcpclient v1.3.1 (/opt/rustwide/workdir)
[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(async_closure)]
[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 `tcpclient`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name tcpclient 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 anyhow=/opt/rustwide/target/debug/deps/libanyhow-c71486e08dde7454.rmeta --extern aqueue=/opt/rustwide/target/debug/deps/libaqueue-8d33858e2c7f2ac8.rmeta --extern async_trait=/opt/rustwide/target/debug/deps/libasync_trait-a657f50f2ab78a09.so --extern log=/opt/rustwide/target/debug/deps/liblog-325d2e3c8b888de3.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-e2dbb52b2089a3c0.rmeta --cap-lints=warn --crate-version 1.3.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8eeaf840b7ec76dc1efcc40d8acc3a42700ed5de138f75e4585af36f8c738572", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8eeaf840b7ec76dc1efcc40d8acc3a42700ed5de138f75e4585af36f8c738572", kill_on_drop: false }`
[INFO] [stdout] 8eeaf840b7ec76dc1efcc40d8acc3a42700ed5de138f75e4585af36f8c738572
