[INFO] fetching crate unix-tty 0.3.3...
[INFO] documenting unix-tty-0.3.3 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate unix-tty 0.3.3 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate unix-tty 0.3.3 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 unix-tty 0.3.3
[INFO] finished tweaking crates.io crate unix-tty 0.3.3
[INFO] tweaked toml for crates.io crate unix-tty 0.3.3 written to /workspace/builds/worker-12/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 tempus v0.2.4
[INFO] [stderr]   Downloaded containers v0.9.9
[INFO] [stderr]   Downloaded i-o v0.4.7
[INFO] [stderr]   Downloaded unix v0.6.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] f179994940deef1cd33926f25c8f8c5bbb2a98acc9efeaeb8d770322acddc0d9
[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" "f179994940deef1cd33926f25c8f8c5bbb2a98acc9efeaeb8d770322acddc0d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f179994940deef1cd33926f25c8f8c5bbb2a98acc9efeaeb8d770322acddc0d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f179994940deef1cd33926f25c8f8c5bbb2a98acc9efeaeb8d770322acddc0d9", kill_on_drop: false }`
[INFO] [stdout] f179994940deef1cd33926f25c8f8c5bbb2a98acc9efeaeb8d770322acddc0d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] d120b9cf795f338eff191febdedef6f54f436e3a90420ded2af4d709725603ef
[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" "d120b9cf795f338eff191febdedef6f54f436e3a90420ded2af4d709725603ef", 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] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling ptr v0.2.2
[INFO] [stderr]    Compiling hash-table v0.2.4
[INFO] [stderr]    Compiling containers v0.9.9
[INFO] [stderr]     Checking heap v0.1.0
[INFO] [stderr]     Checking idem v0.4.0
[INFO] [stderr]    Compiling i-o v0.4.7
[INFO] [stderr]     Checking rel v0.2.0
[INFO] [stderr]     Checking libc-interface v0.1.1
[INFO] [stderr]     Checking utf v0.1.5
[INFO] [stderr]     Checking system-call v0.1.2
[INFO] [stderr]     Checking flags v0.1.4
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking fallible v0.1.3
[INFO] [stderr]    Compiling unix v0.6.10
[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/system-call-0.1.2/src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(llvm_asm)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking idem v0.1.1
[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 `system-call`.
[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" "d120b9cf795f338eff191febdedef6f54f436e3a90420ded2af4d709725603ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d120b9cf795f338eff191febdedef6f54f436e3a90420ded2af4d709725603ef", kill_on_drop: false }`
[INFO] [stdout] d120b9cf795f338eff191febdedef6f54f436e3a90420ded2af4d709725603ef