[INFO] fetching crate xain-fl 0.8.0...
[INFO] documenting xain-fl-0.8.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate xain-fl 0.8.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate xain-fl 0.8.0 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 xain-fl 0.8.0
[INFO] finished tweaking crates.io crate xain-fl 0.8.0
[INFO] tweaked toml for crates.io crate xain-fl 0.8.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate xain-fl 0.8.0 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 opentelemetry-jaeger v0.1.0
[INFO] [stderr]   Downloaded paste v0.1.8
[INFO] [stderr]   Downloaded paste-impl v0.1.8
[INFO] [stderr]   Downloaded tarpc v0.20.0
[INFO] [stderr]   Downloaded mockall v0.6.0
[INFO] [stderr]   Downloaded mockall_derive v0.6.0
[INFO] [stderr]   Downloaded protobuf v2.11.0
[INFO] [stderr]   Downloaded tracing-opentelemetry v0.2.0
[INFO] [stderr]   Downloaded derivative v2.0.2
[INFO] [stderr]   Downloaded opentelemetry v0.2.0
[INFO] [stderr]   Downloaded tarpc-plugins v0.7.0
[INFO] [stderr]   Downloaded stubborn-io v0.1.8
[INFO] [stderr]   Downloaded raii-counter v0.2.1
[INFO] [stderr]   Downloaded tokio-serde v0.6.1
[INFO] [stderr]   Downloaded pyo3cls v0.9.1
[INFO] [stderr]   Downloaded pyo3-derive-backend v0.9.1
[INFO] [stderr]   Downloaded pyo3 v0.9.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] b91a1cdb6c47c966f3d513f10859f18679d418e18978272e0dd784580f98ca64
[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" "b91a1cdb6c47c966f3d513f10859f18679d418e18978272e0dd784580f98ca64", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b91a1cdb6c47c966f3d513f10859f18679d418e18978272e0dd784580f98ca64", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b91a1cdb6c47c966f3d513f10859f18679d418e18978272e0dd784580f98ca64", kill_on_drop: false }`
[INFO] [stdout] b91a1cdb6c47c966f3d513f10859f18679d418e18978272e0dd784580f98ca64
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] cdbf6359f7a0518e4b8a3b5d6983a0043a4a9bafe45a373d65c655645dae8c25
[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" "cdbf6359f7a0518e4b8a3b5d6983a0043a4a9bafe45a373d65c655645dae8c25", kill_on_drop: false }`
[INFO] [stderr]    Compiling unindent v0.1.5
[INFO] [stderr]     Checking raii-counter v0.2.1
[INFO] [stderr]     Checking sharded-slab v0.0.8
[INFO] [stderr]    Compiling nom v5.1.1
[INFO] [stderr]     Checking lock_api v0.3.3
[INFO] [stderr]     Checking tracing-log v0.1.1
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]    Compiling lexical-core v0.6.2
[INFO] [stderr]     Checking parking_lot_core v0.7.0
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]    Compiling regex v1.3.6
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]    Compiling syn v1.0.17
[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/lock_api-0.3.3/src/lib.rs:89:34
[INFO] [stdout]    |
[INFO] [stdout] 89 | #![cfg_attr(feature = "nightly", feature(const_fn))]
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking sha-1 v0.8.2
[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 `lock_api`.
[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" "cdbf6359f7a0518e4b8a3b5d6983a0043a4a9bafe45a373d65c655645dae8c25", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdbf6359f7a0518e4b8a3b5d6983a0043a4a9bafe45a373d65c655645dae8c25", kill_on_drop: false }`
[INFO] [stdout] cdbf6359f7a0518e4b8a3b5d6983a0043a4a9bafe45a373d65c655645dae8c25