[INFO] fetching crate ssb-client 0.3.1...
[INFO] documenting ssb-client-0.3.1 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate ssb-client 0.3.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate ssb-client 0.3.1 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 ssb-client 0.3.1
[INFO] finished tweaking crates.io crate ssb-client 0.3.1
[INFO] tweaked toml for crates.io crate ssb-client 0.3.1 written to /workspace/builds/worker-2/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] [stderr]     Blocking waiting for file lock on package cache
[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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 6294720d3131e9333d1b01904a6e74e25f8828e7dadf4091eea62b549848410d
[INFO] running `Command { std: "docker" "start" "-a" "6294720d3131e9333d1b01904a6e74e25f8828e7dadf4091eea62b549848410d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6294720d3131e9333d1b01904a6e74e25f8828e7dadf4091eea62b549848410d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6294720d3131e9333d1b01904a6e74e25f8828e7dadf4091eea62b549848410d", kill_on_drop: false }`
[INFO] [stdout] 6294720d3131e9333d1b01904a6e74e25f8828e7dadf4091eea62b549848410d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] [stdout] aa715d114e53c6c91261b897b6cb578ec1316e7f4eb801f2a106fb1d1add82ee
[INFO] running `Command { std: "docker" "start" "-a" "aa715d114e53c6c91261b897b6cb578ec1316e7f4eb801f2a106fb1d1add82ee", kill_on_drop: false }`
[INFO] [stderr]    Compiling box_stream v0.4.0
[INFO] [stderr]     Checking multi-producer-sink v0.3.0
[INFO] [stderr]     Checking multi-consumer-stream v0.3.0
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]     Checking quickcheck v0.5.0
[INFO] [stderr]     Checking atm-io-utils v0.1.0
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-codec v0.1.2
[INFO] [stderr]     Checking tokio-fs v0.1.7
[INFO] [stderr]     Checking secret_handshake v4.0.0
[INFO] [stderr]     Checking packet-stream-codec v0.1.0
[INFO] [stderr]     Checking atm-async-utils v0.1.2
[INFO] [stderr]     Checking tokio-uds v0.2.7
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio-udp v0.1.6
[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/secret_handshake-4.0.0/src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(unique)]
[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 `secret_handshake`
[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" "aa715d114e53c6c91261b897b6cb578ec1316e7f4eb801f2a106fb1d1add82ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa715d114e53c6c91261b897b6cb578ec1316e7f4eb801f2a106fb1d1add82ee", kill_on_drop: false }`
[INFO] [stdout] aa715d114e53c6c91261b897b6cb578ec1316e7f4eb801f2a106fb1d1add82ee
