[INFO] fetching crate kf-protocol-transport 2.0.4...
[INFO] checking kf-protocol-transport-2.0.4 against beta for pr-78714
[INFO] extracting crate kf-protocol-transport 2.0.4 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate kf-protocol-transport 2.0.4 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 kf-protocol-transport 2.0.4
[INFO] finished tweaking crates.io crate kf-protocol-transport 2.0.4
[INFO] tweaked toml for crates.io crate kf-protocol-transport 2.0.4 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5360f9e49366cbd2d584fad8a08bbcad873eadbbcf7a8dadd1b7311fe291f26d
[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" "5360f9e49366cbd2d584fad8a08bbcad873eadbbcf7a8dadd1b7311fe291f26d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5360f9e49366cbd2d584fad8a08bbcad873eadbbcf7a8dadd1b7311fe291f26d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5360f9e49366cbd2d584fad8a08bbcad873eadbbcf7a8dadd1b7311fe291f26d", kill_on_drop: false }`
[INFO] [stdout] 5360f9e49366cbd2d584fad8a08bbcad873eadbbcf7a8dadd1b7311fe291f26d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3497969c0b2c485f981995f6e26ad5b8ecc075828aeec12e7df6610eb2095fc9
[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" "3497969c0b2c485f981995f6e26ad5b8ecc075828aeec12e7df6610eb2095fc9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking futures-timer v2.0.2
[INFO] [stderr]     Checking regex v1.4.2
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking polling v2.0.2
[INFO] [stderr]     Checking nb-connect v1.0.2
[INFO] [stderr]     Checking tracing-log v0.1.1
[INFO] [stderr]    Compiling async-test-derive v1.0.0
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking serde_json v1.0.59
[INFO] [stderr]     Checking tracing v0.1.21
[INFO] [stderr]     Checking futures-util v0.3.8
[INFO] [stderr]     Checking kf-protocol-core 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/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" "3497969c0b2c485f981995f6e26ad5b8ecc075828aeec12e7df6610eb2095fc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3497969c0b2c485f981995f6e26ad5b8ecc075828aeec12e7df6610eb2095fc9", kill_on_drop: false }`
[INFO] [stdout] 3497969c0b2c485f981995f6e26ad5b8ecc075828aeec12e7df6610eb2095fc9