[INFO] fetching crate bootloader 0.10.8...
[INFO] testing bootloader-0.10.8 against 1.55.0 for beta-1.56-1
[INFO] extracting crate bootloader 0.10.8 into /workspace/builds/worker-31/source
[INFO] validating manifest of crates.io crate bootloader 0.10.8 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] removed /workspace/builds/worker-31/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-31/source/rust-toolchain
[INFO] started tweaking crates.io crate bootloader 0.10.8
[INFO] finished tweaking crates.io crate bootloader 0.10.8
[INFO] tweaked toml for crates.io crate bootloader 0.10.8 written to /workspace/builds/worker-31/source/Cargo.toml
[INFO] crate crates.io crate bootloader 0.10.8 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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] 8bc8fbd59f249251c2074498ab3e436819599d3f1b9b86487c18101dfd0c818b
[INFO] running `Command { std: "docker" "start" "-a" "8bc8fbd59f249251c2074498ab3e436819599d3f1b9b86487c18101dfd0c818b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8bc8fbd59f249251c2074498ab3e436819599d3f1b9b86487c18101dfd0c818b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8bc8fbd59f249251c2074498ab3e436819599d3f1b9b86487c18101dfd0c818b", kill_on_drop: false }`
[INFO] [stdout] 8bc8fbd59f249251c2074498ab3e436819599d3f1b9b86487c18101dfd0c818b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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] 627d892f2898cb48c9c04de5f2f73b0b6fe419e061329b21eb7c9bc7e6a96473
[INFO] running `Command { std: "docker" "start" "-a" "627d892f2898cb48c9c04de5f2f73b0b6fe419e061329b21eb7c9bc7e6a96473", kill_on_drop: false }`
[INFO] [stderr]    Compiling bootloader v0.10.8 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:69:1
[INFO] [stdout]    |
[INFO] [stdout] 69 | #![feature(asm)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:70:1
[INFO] [stdout]    |
[INFO] [stdout] 70 | #![feature(maybe_uninit_extra)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:71:1
[INFO] [stdout]    |
[INFO] [stdout] 71 | #![feature(maybe_uninit_slice)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bootloader` due to 4 previous errors
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "627d892f2898cb48c9c04de5f2f73b0b6fe419e061329b21eb7c9bc7e6a96473", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "627d892f2898cb48c9c04de5f2f73b0b6fe419e061329b21eb7c9bc7e6a96473", kill_on_drop: false }`
[INFO] [stdout] 627d892f2898cb48c9c04de5f2f73b0b6fe419e061329b21eb7c9bc7e6a96473