[INFO] fetching crate nstack 0.14.0-rc.0...
[INFO] testing nstack-0.14.0-rc.0 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate nstack 0.14.0-rc.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate nstack 0.14.0-rc.0 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-3/source/rust-toolchain
[INFO] started tweaking crates.io crate nstack 0.14.0-rc.0
[INFO] finished tweaking crates.io crate nstack 0.14.0-rc.0
[INFO] tweaked toml for crates.io crate nstack 0.14.0-rc.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", 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] ac58e0f4706a029c5736ca59d047b14d60b4cb33b8479b48af6264c9b414b2ff
[INFO] running `Command { std: "docker" "start" "-a" "ac58e0f4706a029c5736ca59d047b14d60b4cb33b8479b48af6264c9b414b2ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ac58e0f4706a029c5736ca59d047b14d60b4cb33b8479b48af6264c9b414b2ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac58e0f4706a029c5736ca59d047b14d60b4cb33b8479b48af6264c9b414b2ff", kill_on_drop: false }`
[INFO] [stdout] ac58e0f4706a029c5736ca59d047b14d60b4cb33b8479b48af6264c9b414b2ff
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--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] 52e6adc8de5fe1f4ee6190230069222a2ff9d159b98889a9e5a7f2e6ee7f9a87
[INFO] running `Command { std: "docker" "start" "-a" "52e6adc8de5fe1f4ee6190230069222a2ff9d159b98889a9e5a7f2e6ee7f9a87", kill_on_drop: false }`
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling parking_lot_core v0.9.2
[INFO] [stderr]    Compiling constant_time_eq v0.1.5
[INFO] [stderr]    Compiling arrayref v0.3.6
[INFO] [stderr]    Compiling array-init v2.0.0
[INFO] [stderr]    Compiling dusk-varint v0.1.0
[INFO] [stderr]    Compiling arbitrary v1.1.0
[INFO] [stderr]    Compiling lock_api v0.4.7
[INFO] [stderr]    Compiling parking_lot v0.12.0
[INFO] [stderr]    Compiling spin v0.9.2
[INFO] [stderr]    Compiling blake2b_simd v0.3.1
[INFO] [stderr]    Compiling canonical v0.7.0
[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/canonical-0.7.0/src/lib.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(never_type)]
[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 `canonical` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "52e6adc8de5fe1f4ee6190230069222a2ff9d159b98889a9e5a7f2e6ee7f9a87", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52e6adc8de5fe1f4ee6190230069222a2ff9d159b98889a9e5a7f2e6ee7f9a87", kill_on_drop: false }`
[INFO] [stdout] 52e6adc8de5fe1f4ee6190230069222a2ff9d159b98889a9e5a7f2e6ee7f9a87