[INFO] fetching crate unix-signal 0.1.2...
[INFO] checking unix-signal-0.1.2 against beta for pr-78714
[INFO] extracting crate unix-signal 0.1.2 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate unix-signal 0.1.2 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 unix-signal 0.1.2
[INFO] finished tweaking crates.io crate unix-signal 0.1.2
[INFO] tweaked toml for crates.io crate unix-signal 0.1.2 written to /workspace/builds/worker-14/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] c0f5e267af0b9261d4bd5907f21e41c6118a2519e10c72904440015fd5ac9316
[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" "c0f5e267af0b9261d4bd5907f21e41c6118a2519e10c72904440015fd5ac9316", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c0f5e267af0b9261d4bd5907f21e41c6118a2519e10c72904440015fd5ac9316", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0f5e267af0b9261d4bd5907f21e41c6118a2519e10c72904440015fd5ac9316", kill_on_drop: false }`
[INFO] [stdout] c0f5e267af0b9261d4bd5907f21e41c6118a2519e10c72904440015fd5ac9316
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f308ca9259559b10d1446b3b9c3bef6110dcc02e0547b2f2a13cd3fd53cd3b4b
[INFO] running `Command { std: "docker" "start" "-a" "f308ca9259559b10d1446b3b9c3bef6110dcc02e0547b2f2a13cd3fd53cd3b4b", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling ptr v0.2.2
[INFO] [stderr]    Compiling hash-table v0.2.4
[INFO] [stderr]    Compiling containers v0.9.9
[INFO] [stderr]     Checking heap v0.1.0
[INFO] [stderr]    Compiling i-o v0.4.7
[INFO] [stderr]     Checking rel v0.2.0
[INFO] [stderr]     Checking idem v0.4.0
[INFO] [stderr]     Checking utf v0.1.5
[INFO] [stderr]     Checking libc-interface v0.1.1
[INFO] [stderr]     Checking flags v0.1.4
[INFO] [stderr]     Checking system-call v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking fallible v0.1.3
[INFO] [stderr]    Compiling unix v0.6.10
[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/system-call-0.1.2/src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(llvm_asm)]
[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 `system-call`
[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" "f308ca9259559b10d1446b3b9c3bef6110dcc02e0547b2f2a13cd3fd53cd3b4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f308ca9259559b10d1446b3b9c3bef6110dcc02e0547b2f2a13cd3fd53cd3b4b", kill_on_drop: false }`
[INFO] [stdout] f308ca9259559b10d1446b3b9c3bef6110dcc02e0547b2f2a13cd3fd53cd3b4b