[INFO] cloning repository https://github.com/hurryabit/stack-safe-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hurryabit/stack-safe-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhurryabit%2Fstack-safe-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhurryabit%2Fstack-safe-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1055593033a6ca9da0b67313b2ff23cdcd417adf
[INFO] testing hurryabit/stack-safe-rs against beta-2022-02-22 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhurryabit%2Fstack-safe-rs" "/workspace/builds/worker-26/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-26/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hurryabit/stack-safe-rs on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hurryabit/stack-safe-rs
[INFO] finished tweaking git repo https://github.com/hurryabit/stack-safe-rs
[INFO] tweaked toml for git repo https://github.com/hurryabit/stack-safe-rs written to /workspace/builds/worker-26/source/Cargo.toml
[INFO] crate git repo https://github.com/hurryabit/stack-safe-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_json v1.0.70
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 62d076082301d795a97f67504858617e2a49905b51a8a3da7db7e1a3eed97c56
[INFO] running `Command { std: "docker" "start" "-a" "62d076082301d795a97f67504858617e2a49905b51a8a3da7db7e1a3eed97c56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "62d076082301d795a97f67504858617e2a49905b51a8a3da7db7e1a3eed97c56", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62d076082301d795a97f67504858617e2a49905b51a8a3da7db7e1a3eed97c56", kill_on_drop: false }`
[INFO] [stdout] 62d076082301d795a97f67504858617e2a49905b51a8a3da7db7e1a3eed97c56
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-26/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bfa0ab0f0ac79d6c97a75113c361e440e7058d6a74d49ff98e84d52bec162b4d
[INFO] running `Command { std: "docker" "start" "-a" "bfa0ab0f0ac79d6c97a75113c361e440e7058d6a74d49ff98e84d52bec162b4d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.107
[INFO] [stderr]    Compiling unicode-width v0.1.9
[INFO] [stderr]    Compiling ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling stack-safe v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     destructuring_assignment,
[INFO] [stdout] 3 | |     generators,
[INFO] [stdout] 4 | |     generator_trait,
[INFO] [stdout] 5 | |     step_trait,
[INFO] [stdout] 6 | |     thread_spawn_unchecked
[INFO] [stdout] 7 | | )]
[INFO] [stdout]   | |__^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `destructuring_assignment` has been stable since 1.59.0 and no longer requires an attribute to enable
[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 `stack-safe` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "bfa0ab0f0ac79d6c97a75113c361e440e7058d6a74d49ff98e84d52bec162b4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bfa0ab0f0ac79d6c97a75113c361e440e7058d6a74d49ff98e84d52bec162b4d", kill_on_drop: false }`
[INFO] [stdout] bfa0ab0f0ac79d6c97a75113c361e440e7058d6a74d49ff98e84d52bec162b4d