[INFO] cloning repository https://github.com/dflemstr/precip
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dflemstr/precip" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdflemstr%2Fprecip", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdflemstr%2Fprecip'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5386785118d85a206da1adb986dacc50c716e2c6
[INFO] documenting dflemstr/precip against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdflemstr%2Fprecip" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dflemstr/precip 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 git repo https://github.com/dflemstr/precip
[INFO] finished tweaking git repo https://github.com/dflemstr/precip
[INFO] tweaked toml for git repo https://github.com/dflemstr/precip written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/dflemstr/precip 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 6f95e2283f6fa30344e957fc6fa705bcef6c90350e2b1b4e7c8e57bceb47060d
[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" "6f95e2283f6fa30344e957fc6fa705bcef6c90350e2b1b4e7c8e57bceb47060d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6f95e2283f6fa30344e957fc6fa705bcef6c90350e2b1b4e7c8e57bceb47060d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f95e2283f6fa30344e957fc6fa705bcef6c90350e2b1b4e7c8e57bceb47060d", kill_on_drop: false }`
[INFO] [stdout] 6f95e2283f6fa30344e957fc6fa705bcef6c90350e2b1b4e7c8e57bceb47060d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 4002b4f6fce2531c398a2aa6a4a471c24ac74e3a0551ab742bc8b6d3ba38ca5c
[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" "4002b4f6fce2531c398a2aa6a4a471c24ac74e3a0551ab742bc8b6d3ba38ca5c", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.79
[INFO] [stderr]    Compiling proc-macro2 v0.4.20
[INFO] [stderr]    Compiling remove_dir_all v0.5.1
[INFO] [stderr]    Compiling same-file v1.0.3
[INFO] [stderr]     Checking string v0.1.1
[INFO] [stderr]    Compiling openssl v0.10.12
[INFO] [stderr]    Compiling native-tls v0.2.1
[INFO] [stderr]    Compiling failure_derive v0.1.2
[INFO] [stderr]     Checking futures-await-await-macro v0.1.1
[INFO] [stderr]     Checking i2csensors v0.1.3 (https://github.com/dflemstr/i2cdev-sensors.git?branch=upgrade-i2cdev#a9a69944)
[INFO] [stderr]     Checking rust-ini v0.12.2
[INFO] [stderr]     Checking nom v2.1.0
[INFO] [stderr]    Compiling memchr v2.1.0
[INFO] [stderr]     Checking memchr v0.1.11
[INFO] [stderr]     Checking dirs v1.0.4
[INFO] [stderr]    Compiling openssl-sys v0.9.36
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]    Compiling libsystemd-sys v0.0.10
[INFO] [stderr]     Checking xml-rs v0.7.0
[INFO] [stderr]     Checking qutex v0.2.1
[INFO] [stderr]     Checking want v0.0.6
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking aho-corasick v0.5.3
[INFO] [stderr]     Checking tokio-io v0.1.9
[INFO] [stderr]     Checking http v0.1.13
[INFO] [stderr]     Checking nix v0.10.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.24
[INFO] [stderr]    Compiling walkdir v2.2.5
[INFO] [stderr]     Checking num-integer v0.1.39
[INFO] [stderr]     Checking slog-scope v4.0.1
[INFO] [stderr]    Compiling bitfield-register-macro v0.2.1
[INFO] [stderr]     Checking crossbeam-epoch v0.5.2
[INFO] [stderr]     Checking backtrace v0.3.9
[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/bitfield-register-macro-0.2.1/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking thread-id v2.0.0
[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 `bitfield-register-macro`.
[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" "4002b4f6fce2531c398a2aa6a4a471c24ac74e3a0551ab742bc8b6d3ba38ca5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4002b4f6fce2531c398a2aa6a4a471c24ac74e3a0551ab742bc8b6d3ba38ca5c", kill_on_drop: false }`
[INFO] [stdout] 4002b4f6fce2531c398a2aa6a4a471c24ac74e3a0551ab742bc8b6d3ba38ca5c