[INFO] fetching crate tari_base_node 0.4.2...
[INFO] documenting tari_base_node-0.4.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate tari_base_node 0.4.2 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate tari_base_node 0.4.2 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 tari_base_node 0.4.2
[INFO] finished tweaking crates.io crate tari_base_node 0.4.2
[INFO] tweaked toml for crates.io crate tari_base_node 0.4.2 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate tari_base_node 0.4.2 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 rustyline-derive v0.3.1
[INFO] [stderr]   Downloaded parity-scale-codec v1.3.1
[INFO] [stderr]   Downloaded tari_service_framework v0.0.10
[INFO] [stderr]   Downloaded tari_storage v0.1.0
[INFO] [stderr]   Downloaded tari_mmr v0.2.0
[INFO] [stderr]   Downloaded tari_common v0.2.0
[INFO] [stderr]   Downloaded tari_storage v0.2.0
[INFO] [stderr]   Downloaded tari_key_manager v0.2.0
[INFO] [stderr]   Downloaded tari_p2p v0.2.0
[INFO] [stderr]   Downloaded monero v0.5.0
[INFO] [stderr]   Downloaded tari_comms_dht v0.2.0
[INFO] [stderr]   Downloaded tari_comms v0.2.0
[INFO] [stderr]   Downloaded tari_wallet v0.2.0
[INFO] [stderr]   Downloaded tari_core v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 5be3550cd823f5a5b824f2217b0677826fa0bad74285172076433b7f6dbf0f74
[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" "5be3550cd823f5a5b824f2217b0677826fa0bad74285172076433b7f6dbf0f74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5be3550cd823f5a5b824f2217b0677826fa0bad74285172076433b7f6dbf0f74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5be3550cd823f5a5b824f2217b0677826fa0bad74285172076433b7f6dbf0f74", kill_on_drop: false }`
[INFO] [stdout] 5be3550cd823f5a5b824f2217b0677826fa0bad74285172076433b7f6dbf0f74
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] f0d35596e1e21f7bd15f59874ff9b4cc0eebc9d9099f54aadcfb50adb33c49c4
[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" "f0d35596e1e21f7bd15f59874ff9b4cc0eebc9d9099f54aadcfb50adb33c49c4", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.34
[INFO] [stderr]    Compiling libc v0.2.72
[INFO] [stderr]    Compiling either v1.5.3
[INFO] [stderr]    Compiling tinyvec v0.3.3
[INFO] [stderr]    Compiling data-encoding v2.2.1
[INFO] [stderr]     Checking rustc-hex v2.1.0
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking subtle v2.2.3
[INFO] [stderr]    Compiling heapsize v0.4.2
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]     Checking radium v0.3.0
[INFO] [stderr]     Checking byte-slice-cast v0.3.5
[INFO] [stderr]     Checking arrayvec v0.5.1
[INFO] [stderr]    Compiling serde-big-array v0.2.0
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[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/subtle-2.2.3/src/lib.rs:12:34
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![cfg_attr(feature = "nightly", feature(external_doc))]
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking bytemuck v1.2.0
[INFO] [stderr]     Checking scanlex v0.1.2
[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 `subtle`.
[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" "f0d35596e1e21f7bd15f59874ff9b4cc0eebc9d9099f54aadcfb50adb33c49c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0d35596e1e21f7bd15f59874ff9b4cc0eebc9d9099f54aadcfb50adb33c49c4", kill_on_drop: false }`
[INFO] [stdout] f0d35596e1e21f7bd15f59874ff9b4cc0eebc9d9099f54aadcfb50adb33c49c4