[INFO] fetching crate pebble-skip 0.0.1...
[INFO] checking pebble-skip-0.0.1 against beta for pr-78714
[INFO] extracting crate pebble-skip 0.0.1 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate pebble-skip 0.0.1 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 pebble-skip 0.0.1
[INFO] finished tweaking crates.io crate pebble-skip 0.0.1
[INFO] tweaked toml for crates.io crate pebble-skip 0.0.1 written to /workspace/builds/worker-0/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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] bec6efa75a1bfc57fa25c5c6069a6e8c074f869d79ff69a8bf4f0b46f0be22f4
[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" "bec6efa75a1bfc57fa25c5c6069a6e8c074f869d79ff69a8bf4f0b46f0be22f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bec6efa75a1bfc57fa25c5c6069a6e8c074f869d79ff69a8bf4f0b46f0be22f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bec6efa75a1bfc57fa25c5c6069a6e8c074f869d79ff69a8bf4f0b46f0be22f4", kill_on_drop: false }`
[INFO] [stdout] bec6efa75a1bfc57fa25c5c6069a6e8c074f869d79ff69a8bf4f0b46f0be22f4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 32f04520da26594a0f3cb7aabc1c339c0bd8b8a72f93621b91d2a8b86a9e120f
[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" "32f04520da26594a0f3cb7aabc1c339c0bd8b8a72f93621b91d2a8b86a9e120f", kill_on_drop: false }`
[INFO] [stderr]     Checking pebble-sys v0.0.1
[INFO] [stderr]     Checking debugless-unwrap v0.0.4
[INFO] [stderr]     Checking unsafe_unwrap v0.1.0
[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/pebble-sys-0.0.1/src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(extern_types)]
[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 `pebble-sys`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "32f04520da26594a0f3cb7aabc1c339c0bd8b8a72f93621b91d2a8b86a9e120f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "32f04520da26594a0f3cb7aabc1c339c0bd8b8a72f93621b91d2a8b86a9e120f", kill_on_drop: false }`
[INFO] [stdout] 32f04520da26594a0f3cb7aabc1c339c0bd8b8a72f93621b91d2a8b86a9e120f