[INFO] fetching crate tfjs-sys 0.0.1...
[INFO] documenting tfjs-sys-0.0.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate tfjs-sys 0.0.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate tfjs-sys 0.0.1 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 tfjs-sys 0.0.1
[INFO] finished tweaking crates.io crate tfjs-sys 0.0.1
[INFO] tweaked toml for crates.io crate tfjs-sys 0.0.1 written to /workspace/builds/worker-4/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 wasm-bindgen-test-macro v0.3.1
[INFO] [stderr]   Downloaded wasm-bindgen-test v0.3.1
[INFO] [stderr]   Downloaded weedle v0.11.0
[INFO] [stderr]   Downloaded wasm-bindgen-webidl v0.2.67
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] be61909e809d74c0b9fd11964e30081ce9143caf3f816c67195c5c8ab5774879
[INFO] running `Command { std: "docker" "start" "-a" "be61909e809d74c0b9fd11964e30081ce9143caf3f816c67195c5c8ab5774879", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be61909e809d74c0b9fd11964e30081ce9143caf3f816c67195c5c8ab5774879", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be61909e809d74c0b9fd11964e30081ce9143caf3f816c67195c5c8ab5774879", kill_on_drop: false }`
[INFO] [stdout] be61909e809d74c0b9fd11964e30081ce9143caf3f816c67195c5c8ab5774879
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 85f7aaa429a2e0d706abec608f433de7674cbc6585417d783dd4e6ff91d43bf8
[INFO] running `Command { std: "docker" "start" "-a" "85f7aaa429a2e0d706abec608f433de7674cbc6585417d783dd4e6ff91d43bf8", kill_on_drop: false }`
[INFO] [stderr]    Compiling wasm-bindgen v0.2.67
[INFO] [stderr]     Checking bumpalo v3.4.0
[INFO] [stderr]     Checking sourcefile v0.1.4
[INFO] [stderr]     Checking wasm-bindgen-shared v0.2.67
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking nom v5.1.2
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.67
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling structopt-derive v0.4.10
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.67
[INFO] [stderr]     Checking weedle v0.11.0
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.67
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking structopt v0.3.17
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/wasm-bindgen-0.2.67/src/lib.rs:11:34
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![cfg_attr(feature = "nightly", feature(unsize))]
[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 `wasm-bindgen`.
[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" "85f7aaa429a2e0d706abec608f433de7674cbc6585417d783dd4e6ff91d43bf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85f7aaa429a2e0d706abec608f433de7674cbc6585417d783dd4e6ff91d43bf8", kill_on_drop: false }`
[INFO] [stdout] 85f7aaa429a2e0d706abec608f433de7674cbc6585417d783dd4e6ff91d43bf8