[INFO] fetching crate bc4py-plot-cli 0.1.0...
[INFO] checking bc4py-plot-cli-0.1.0 against beta for pr-78714
[INFO] extracting crate bc4py-plot-cli 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate bc4py-plot-cli 0.1.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate bc4py-plot-cli 0.1.0
[INFO] finished tweaking crates.io crate bc4py-plot-cli 0.1.0
[INFO] tweaked toml for crates.io crate bc4py-plot-cli 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate bc4py-plot-cli 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7d8f9bec856b2c4ae0bcfb76d17f76429df8233aa6645c798b6664da5bb7aec3
[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" "7d8f9bec856b2c4ae0bcfb76d17f76429df8233aa6645c798b6664da5bb7aec3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d8f9bec856b2c4ae0bcfb76d17f76429df8233aa6645c798b6664da5bb7aec3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d8f9bec856b2c4ae0bcfb76d17f76429df8233aa6645c798b6664da5bb7aec3", kill_on_drop: false }`
[INFO] [stdout] 7d8f9bec856b2c4ae0bcfb76d17f76429df8233aa6645c798b6664da5bb7aec3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "RUSTFLAGS=--cap-lints=forbid" "-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" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f3836aa3f4068b74c8dfea5ca3f61a38039275f8637ee1cd74154021f53accef
[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" "f3836aa3f4068b74c8dfea5ca3f61a38039275f8637ee1cd74154021f53accef", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.17
[INFO] [stderr]    Compiling syn v1.0.29
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking etcommon-hexutil v0.2.4
[INFO] [stderr]     Checking elastic-array-plus v0.10.0
[INFO] [stderr]     Checking arrayvec v0.5.1
[INFO] [stderr]     Checking strsim v0.10.0
[INFO] [stderr]     Checking os_str_bytes v2.3.1
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.12
[INFO] [stderr]    Compiling proc-macro-error v0.4.12
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking blake2b_simd v0.5.10
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]    Compiling cc v1.0.54
[INFO] [stderr]     Checking etcommon-rlp v0.2.5
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]     Checking etcommon-bigint v0.2.10
[INFO] [stderr]    Compiling bc4py_hash v0.1.2
[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/bc4py_hash-0.1.2/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(link_args)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bc4py_hash`
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[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" "f3836aa3f4068b74c8dfea5ca3f61a38039275f8637ee1cd74154021f53accef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3836aa3f4068b74c8dfea5ca3f61a38039275f8637ee1cd74154021f53accef", kill_on_drop: false }`
[INFO] [stdout] f3836aa3f4068b74c8dfea5ca3f61a38039275f8637ee1cd74154021f53accef