[INFO] fetching crate arc-rs 0.5.1...
[INFO] testing arc-rs-0.5.1 against 1.60.0 for beta-1.61-1
[INFO] extracting crate arc-rs 0.5.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate arc-rs 0.5.1 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate arc-rs 0.5.1
[INFO] finished tweaking crates.io crate arc-rs 0.5.1
[INFO] tweaked toml for crates.io crate arc-rs 0.5.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded arc-pest v0.4.0
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 905fb6ba150a29d06ded2eb1d4253e1bb9c29fb735f106b88823bd7ae4807efb
[INFO] running `Command { std: "docker" "start" "-a" "905fb6ba150a29d06ded2eb1d4253e1bb9c29fb735f106b88823bd7ae4807efb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "905fb6ba150a29d06ded2eb1d4253e1bb9c29fb735f106b88823bd7ae4807efb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "905fb6ba150a29d06ded2eb1d4253e1bb9c29fb735f106b88823bd7ae4807efb", kill_on_drop: false }`
[INFO] [stdout] 905fb6ba150a29d06ded2eb1d4253e1bb9c29fb735f106b88823bd7ae4807efb
[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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6a3611647ffc2d99c0df3901aa8d2c40e9c3af11e11968c6cdec6b241c5514a6
[INFO] running `Command { std: "docker" "start" "-a" "6a3611647ffc2d99c0df3901aa8d2c40e9c3af11e11968c6cdec6b241c5514a6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling serde_json v1.0.79
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling linked-hash-map v0.5.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.3.3
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling indexmap v1.8.1
[INFO] [stderr]    Compiling arc-pest v0.4.0
[INFO] [stderr]    Compiling num-complex v0.3.1
[INFO] [stderr]    Compiling yaml-rust v0.4.5
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling bigdecimal v0.2.2
[INFO] [stderr]    Compiling num v0.3.1
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling arc-rs v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_syntax)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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 `arc-rs` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "6a3611647ffc2d99c0df3901aa8d2c40e9c3af11e11968c6cdec6b241c5514a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a3611647ffc2d99c0df3901aa8d2c40e9c3af11e11968c6cdec6b241c5514a6", kill_on_drop: false }`
[INFO] [stdout] 6a3611647ffc2d99c0df3901aa8d2c40e9c3af11e11968c6cdec6b241c5514a6