[INFO] fetching crate bootloader 0.10.12...
[INFO] testing bootloader-0.10.12 against 1.59.0 for beta-1.60-1
[INFO] extracting crate bootloader 0.10.12 into /workspace/builds/worker-22/source
[INFO] validating manifest of crates.io crate bootloader 0.10.12 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-22/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-22/source/rust-toolchain
[INFO] started tweaking crates.io crate bootloader 0.10.12
[INFO] finished tweaking crates.io crate bootloader 0.10.12
[INFO] tweaked toml for crates.io crate bootloader 0.10.12 written to /workspace/builds/worker-22/source/Cargo.toml
[INFO] crate crates.io crate bootloader 0.10.12 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4740a3159e84039320e837ed04aa57803665fbaf15d1ecf05505a264c9c0e16a
[INFO] running `Command { std: "docker" "start" "-a" "4740a3159e84039320e837ed04aa57803665fbaf15d1ecf05505a264c9c0e16a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4740a3159e84039320e837ed04aa57803665fbaf15d1ecf05505a264c9c0e16a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4740a3159e84039320e837ed04aa57803665fbaf15d1ecf05505a264c9c0e16a", kill_on_drop: false }`
[INFO] [stdout] 4740a3159e84039320e837ed04aa57803665fbaf15d1ecf05505a264c9c0e16a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 54ace958564ed00e281f36589d26a6400f316ba267f3951364967b5a9b110f93
[INFO] running `Command { std: "docker" "start" "-a" "54ace958564ed00e281f36589d26a6400f316ba267f3951364967b5a9b110f93", kill_on_drop: false }`
[INFO] [stderr]    Compiling bootloader v0.10.12 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:69:12
[INFO] [stdout]    |
[INFO] [stdout] 69 | #![feature(maybe_uninit_slice)]
[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 `bootloader` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "54ace958564ed00e281f36589d26a6400f316ba267f3951364967b5a9b110f93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54ace958564ed00e281f36589d26a6400f316ba267f3951364967b5a9b110f93", kill_on_drop: false }`
[INFO] [stdout] 54ace958564ed00e281f36589d26a6400f316ba267f3951364967b5a9b110f93