[INFO] fetching crate rqtt 0.1.0...
[INFO] checking rqtt-0.1.0 against beta for pr-78714
[INFO] extracting crate rqtt 0.1.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate rqtt 0.1.0 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 rqtt 0.1.0
[INFO] finished tweaking crates.io crate rqtt 0.1.0
[INFO] tweaked toml for crates.io crate rqtt 0.1.0 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate crates.io crate rqtt 0.1.0 already has a lockfile, it will not be regenerated
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] b10616edd663132d97465bfab9ad340da28e94fd6bf885bd7156029f4f957043
[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" "b10616edd663132d97465bfab9ad340da28e94fd6bf885bd7156029f4f957043", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b10616edd663132d97465bfab9ad340da28e94fd6bf885bd7156029f4f957043", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b10616edd663132d97465bfab9ad340da28e94fd6bf885bd7156029f4f957043", kill_on_drop: false }`
[INFO] [stdout] b10616edd663132d97465bfab9ad340da28e94fd6bf885bd7156029f4f957043
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] e65b6a65b66bf4badea3f84bb1c60bff43d6972a44ddc81f113014b64ef6142c
[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" "e65b6a65b66bf4badea3f84bb1c60bff43d6972a44ddc81f113014b64ef6142c", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.13
[INFO] [stderr]     Checking smallvec v1.1.0
[INFO] [stderr]     Checking once_cell v1.2.0
[INFO] [stderr]     Checking futures-io v0.3.1
[INFO] [stderr]     Checking bit_reverse v0.1.8
[INFO] [stderr]     Checking termcolor v1.0.5
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking want v0.2.0
[INFO] [stderr]     Checking kv-log-macro v1.0.4
[INFO] [stderr]     Checking combine v3.8.1
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking futures-cpupool v0.1.8
[INFO] [stderr]     Checking flate2 v1.0.13
[INFO] [stderr]     Checking crossbeam-channel v0.4.0
[INFO] [stderr]     Checking async-task v1.1.1
[INFO] [stderr]     Checking native-tls v0.2.3
[INFO] [stderr]     Checking mime_guess v2.0.1
[INFO] [stderr]     Checking structopt v0.2.18
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking unicode-normalization v0.1.11
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking http v0.1.21
[INFO] [stderr]     Checking string v0.2.1
[INFO] [stderr]     Checking tokio-buf v0.1.1
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking uuid v0.7.4
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking url v2.1.0
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]     Checking http-body v0.1.0
[INFO] [stderr]     Checking publicsuffix v1.5.4
[INFO] [stderr]     Checking cookie v0.12.0
[INFO] [stderr]     Checking env_proxy v0.3.1
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]     Checking toml_edit v0.1.5
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]    Compiling async-trait v0.1.22
[INFO] [stderr]    Compiling packattack-derive v0.3.1
[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/packattack-derive-0.3.1/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(arbitrary_enum_discriminant)]
[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 `packattack-derive`
[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" "e65b6a65b66bf4badea3f84bb1c60bff43d6972a44ddc81f113014b64ef6142c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e65b6a65b66bf4badea3f84bb1c60bff43d6972a44ddc81f113014b64ef6142c", kill_on_drop: false }`
[INFO] [stdout] e65b6a65b66bf4badea3f84bb1c60bff43d6972a44ddc81f113014b64ef6142c