[INFO] fetching crate sonos 0.1.4...
[INFO] testing sonos-0.1.4 against 1.49.0 for beta-1.50-1
[INFO] extracting crate sonos 0.1.4 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate sonos 0.1.4 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate sonos 0.1.4
[INFO] finished tweaking crates.io crate sonos 0.1.4
[INFO] tweaked toml for crates.io crate sonos 0.1.4 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "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] de63d066cf902ef13a6bfd563800e183f5b9c6c967f6244068be3e1cdad31877
[INFO] running `Command { std: "docker" "start" "-a" "de63d066cf902ef13a6bfd563800e183f5b9c6c967f6244068be3e1cdad31877", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "de63d066cf902ef13a6bfd563800e183f5b9c6c967f6244068be3e1cdad31877", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de63d066cf902ef13a6bfd563800e183f5b9c6c967f6244068be3e1cdad31877", kill_on_drop: false }`
[INFO] [stdout] de63d066cf902ef13a6bfd563800e183f5b9c6c967f6244068be3e1cdad31877
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 92256d2b4ed04bad350903c41ae2b3fc28a6d7852560eb689e1d9a6a9b38cad2
[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" "92256d2b4ed04bad350903c41ae2b3fc28a6d7852560eb689e1d9a6a9b38cad2", kill_on_drop: false }`
[INFO] [stderr]    Compiling traitobject v0.1.0
[INFO] [stderr]    Compiling c_linked_list v1.1.1
[INFO] [stderr]    Compiling typeable v0.1.2
[INFO] [stderr]    Compiling xml-rs v0.8.3
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]    Compiling tracing v0.1.22
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling want v0.3.0
[INFO] [stderr]    Compiling serde_urlencoded v0.7.0
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling tokio v0.2.24
[INFO] [stderr]    Compiling native-tls v0.2.7
[INFO] [stderr]    Compiling error-chain v0.10.0
[INFO] [stderr]    Compiling mime v0.2.6
[INFO] [stderr]    Compiling get_if_addrs v0.5.3
[INFO] [stderr]    Compiling tracing-futures v0.2.4
[INFO] [stderr]    Compiling hyper v0.10.16
[INFO] [stderr]    Compiling xmltree v0.10.2
[INFO] [stderr]    Compiling ssdp v0.7.0
[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-0.7.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(ip)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ssdp`
[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" "92256d2b4ed04bad350903c41ae2b3fc28a6d7852560eb689e1d9a6a9b38cad2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92256d2b4ed04bad350903c41ae2b3fc28a6d7852560eb689e1d9a6a9b38cad2", kill_on_drop: false }`
[INFO] [stdout] 92256d2b4ed04bad350903c41ae2b3fc28a6d7852560eb689e1d9a6a9b38cad2