[INFO] fetching crate sauron-native 0.1.0...
[INFO] documenting sauron-native-0.1.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate sauron-native 0.1.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate sauron-native 0.1.0 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 sauron-native 0.1.0
[INFO] finished tweaking crates.io crate sauron-native 0.1.0
[INFO] tweaked toml for crates.io crate sauron-native 0.1.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate sauron-native 0.1.0 already has a lockfile, it will not be regenerated
[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 pkg-config v0.3.15
[INFO] [stderr]   Downloaded unicase v2.4.0
[INFO] [stderr]   Downloaded gdk-pixbuf-sys v0.8.0
[INFO] [stderr]   Downloaded gio-sys v0.8.0
[INFO] [stderr]   Downloaded gdk-pixbuf v0.6.0
[INFO] [stderr]   Downloaded gdk v0.10.0
[INFO] [stderr]   Downloaded gdk-sys v0.8.0
[INFO] [stderr]   Downloaded pango v0.6.0
[INFO] [stderr]   Downloaded pulldown-cmark v0.5.3
[INFO] [stderr]   Downloaded atk-sys v0.8.0
[INFO] [stderr]   Downloaded getopts v0.2.19
[INFO] [stderr]   Downloaded stderrlog v0.4.1
[INFO] [stderr]   Downloaded js-sys v0.3.25
[INFO] [stderr]   Downloaded futures v0.1.28
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.48
[INFO] [stderr]   Downloaded gio v0.6.0
[INFO] [stderr]   Downloaded gtk-sys v0.8.0
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.48
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.48
[INFO] [stderr]   Downloaded wasm-bindgen-test-macro v0.2.48
[INFO] [stderr]   Downloaded atk v0.6.0
[INFO] [stderr]   Downloaded gtk v0.6.0
[INFO] [stderr]   Downloaded pango-sys v0.8.0
[INFO] [stderr]   Downloaded sauron v0.10.0
[INFO] [stderr]   Downloaded bumpalo v2.5.0
[INFO] [stderr]   Downloaded wasm-bindgen-webidl v0.2.48
[INFO] [stderr]   Downloaded web-sys v0.3.25
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.48
[INFO] [stderr]   Downloaded itui v0.7.0
[INFO] [stderr]   Downloaded wasm-bindgen-test v0.2.48
[INFO] [stderr]   Downloaded sauron_vdom v0.10.0
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.48
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.3.25
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] [stdout] 7a91546e7d4144d37d3ee7e5d4af39287022a24b98496a7f1fe9617f2c125f28
[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" "7a91546e7d4144d37d3ee7e5d4af39287022a24b98496a7f1fe9617f2c125f28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7a91546e7d4144d37d3ee7e5d4af39287022a24b98496a7f1fe9617f2c125f28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a91546e7d4144d37d3ee7e5d4af39287022a24b98496a7f1fe9617f2c125f28", kill_on_drop: false }`
[INFO] [stdout] 7a91546e7d4144d37d3ee7e5d4af39287022a24b98496a7f1fe9617f2c125f28
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] [stdout] 0f0ec3c6a1cff73d86ae9a75f9dafb7f01a647a5923e54fe14dcdc463c8b9c99
[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" "0f0ec3c6a1cff73d86ae9a75f9dafb7f01a647a5923e54fe14dcdc463c8b9c99", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking sauron_vdom v0.10.0
[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/sauron_vdom-0.10.0/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(arbitrary_self_types)]
[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 `sauron_vdom`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "0f0ec3c6a1cff73d86ae9a75f9dafb7f01a647a5923e54fe14dcdc463c8b9c99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f0ec3c6a1cff73d86ae9a75f9dafb7f01a647a5923e54fe14dcdc463c8b9c99", kill_on_drop: false }`
[INFO] [stdout] 0f0ec3c6a1cff73d86ae9a75f9dafb7f01a647a5923e54fe14dcdc463c8b9c99