[INFO] fetching crate hue_persistence 0.2.5...
[INFO] testing hue_persistence-0.2.5 against 1.55.0 for beta-1.56-1
[INFO] extracting crate hue_persistence 0.2.5 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate hue_persistence 0.2.5 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hue_persistence 0.2.5
[INFO] finished tweaking crates.io crate hue_persistence 0.2.5
[INFO] tweaked toml for crates.io crate hue_persistence 0.2.5 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ifaces v0.0.3
[INFO] [stderr]   Downloaded philipshue v0.2.4
[INFO] [stderr]   Downloaded ssdp v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5d54a8c6c38f3a8c7af2c70e5939ae3c3f3508b7d6b0b43e7419766ac1629710
[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" "5d54a8c6c38f3a8c7af2c70e5939ae3c3f3508b7d6b0b43e7419766ac1629710", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5d54a8c6c38f3a8c7af2c70e5939ae3c3f3508b7d6b0b43e7419766ac1629710", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d54a8c6c38f3a8c7af2c70e5939ae3c3f3508b7d6b0b43e7419766ac1629710", kill_on_drop: false }`
[INFO] [stdout] 5d54a8c6c38f3a8c7af2c70e5939ae3c3f3508b7d6b0b43e7419766ac1629710
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "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] 1c1c9ad5f4be66b9e9784cbc7db6889ff48399d8854c5466d06add621c75d9d3
[INFO] running `Command { std: "docker" "start" "-a" "1c1c9ad5f4be66b9e9784cbc7db6889ff48399d8854c5466d06add621c75d9d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling bitflags v0.4.0
[INFO] [stderr]    Compiling serde v0.7.15
[INFO] [stderr]    Compiling philipshue v0.2.4
[INFO] [stderr]    Compiling unix_socket v0.5.0
[INFO] [stderr]    Compiling hpack v0.2.0
[INFO] [stderr]    Compiling mime v0.2.6
[INFO] [stderr]    Compiling cookie v0.2.5
[INFO] [stderr]    Compiling error-chain v0.7.2
[INFO] [stderr]    Compiling serde_json v0.8.6
[INFO] [stderr]    Compiling nix v0.5.1
[INFO] [stderr]    Compiling syn v0.10.8
[INFO] [stderr]    Compiling solicit v0.4.4
[INFO] [stderr]    Compiling syslog v3.3.0
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.3
[INFO] [stderr]    Compiling hyper v0.9.18
[INFO] [stderr]    Compiling ifaces v0.0.3
[INFO] [stderr]    Compiling serde_codegen v0.8.23
[INFO] [stderr]    Compiling serde_derive v0.8.23
[INFO] [stderr]    Compiling ssdp v0.5.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ssdp-0.5.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(lookup_host, ip)]
[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 `ssdp` 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" "1c1c9ad5f4be66b9e9784cbc7db6889ff48399d8854c5466d06add621c75d9d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c1c9ad5f4be66b9e9784cbc7db6889ff48399d8854c5466d06add621c75d9d3", kill_on_drop: false }`
[INFO] [stdout] 1c1c9ad5f4be66b9e9784cbc7db6889ff48399d8854c5466d06add621c75d9d3