[INFO] fetching crate kf-protocol-message 2.0.0...
[INFO] testing kf-protocol-message-2.0.0 against 1.54.0 for beta-1.55-1
[INFO] extracting crate kf-protocol-message 2.0.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate kf-protocol-message 2.0.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate kf-protocol-message 2.0.0
[INFO] finished tweaking crates.io crate kf-protocol-message 2.0.0
[INFO] tweaked toml for crates.io crate kf-protocol-message 2.0.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 29d953e918a16a19d7569b1a161638880cc250d4c0d26f0f526f6b0e972cebef
[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" "29d953e918a16a19d7569b1a161638880cc250d4c0d26f0f526f6b0e972cebef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "29d953e918a16a19d7569b1a161638880cc250d4c0d26f0f526f6b0e972cebef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29d953e918a16a19d7569b1a161638880cc250d4c0d26f0f526f6b0e972cebef", kill_on_drop: false }`
[INFO] [stdout] 29d953e918a16a19d7569b1a161638880cc250d4c0d26f0f526f6b0e972cebef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6ac4c98f9db1f11c4e45177d7548e7e49d24b738a9701cad401530099b5706be
[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" "6ac4c98f9db1f11c4e45177d7548e7e49d24b738a9701cad401530099b5706be", kill_on_drop: false }`
[INFO] [stderr]    Compiling crc32c v0.5.0
[INFO] [stderr]    Compiling tracing-log v0.1.2
[INFO] [stderr]    Compiling content_inspector v0.2.4
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling kf-protocol-derive v0.2.0
[INFO] [stderr]    Compiling tracing-serde v0.1.2
[INFO] [stderr]    Compiling kf-protocol-core v0.1.2
[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/kf-protocol-core-0.1.2/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[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 `kf-protocol-core`
[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" "6ac4c98f9db1f11c4e45177d7548e7e49d24b738a9701cad401530099b5706be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ac4c98f9db1f11c4e45177d7548e7e49d24b738a9701cad401530099b5706be", kill_on_drop: false }`
[INFO] [stdout] 6ac4c98f9db1f11c4e45177d7548e7e49d24b738a9701cad401530099b5706be
