[INFO] fetching crate ruspiro-mailbox 0.4.1...
[INFO] testing ruspiro-mailbox-0.4.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate ruspiro-mailbox 0.4.1 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate ruspiro-mailbox 0.4.1 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ruspiro-mailbox 0.4.1
[INFO] finished tweaking crates.io crate ruspiro-mailbox 0.4.1
[INFO] tweaked toml for crates.io crate ruspiro-mailbox 0.4.1 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ruspiro-cache v0.4.1
[INFO] [stderr]   Downloaded ruspiro-error v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f86c50bd3bd727dbf2617a9be2e3ff1c899957d15ae1433e7cd0e2fd122e443a
[INFO] running `Command { std: "docker" "start" "-a" "f86c50bd3bd727dbf2617a9be2e3ff1c899957d15ae1433e7cd0e2fd122e443a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f86c50bd3bd727dbf2617a9be2e3ff1c899957d15ae1433e7cd0e2fd122e443a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f86c50bd3bd727dbf2617a9be2e3ff1c899957d15ae1433e7cd0e2fd122e443a", kill_on_drop: false }`
[INFO] [stdout] f86c50bd3bd727dbf2617a9be2e3ff1c899957d15ae1433e7cd0e2fd122e443a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2694cc0f783432dcaed9f71526113f48d68d37aca24b9891c7335e8100a11e0f
[INFO] running `Command { std: "docker" "start" "-a" "2694cc0f783432dcaed9f71526113f48d68d37aca24b9891c7335e8100a11e0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling ruspiro-register v0.5.4
[INFO] [stderr]    Compiling ruspiro-error v0.1.1
[INFO] [stderr]    Compiling ruspiro-cache v0.4.1
[INFO] [stderr]    Compiling ruspiro-arch-aarch64 v0.1.5
[INFO] [stderr]    Compiling ruspiro-mmio-register v0.1.3
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ruspiro-arch-aarch64-0.1.5/src/lib.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(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 `ruspiro-arch-aarch64` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "2694cc0f783432dcaed9f71526113f48d68d37aca24b9891c7335e8100a11e0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2694cc0f783432dcaed9f71526113f48d68d37aca24b9891c7335e8100a11e0f", kill_on_drop: false }`
[INFO] [stdout] 2694cc0f783432dcaed9f71526113f48d68d37aca24b9891c7335e8100a11e0f