[INFO] fetching crate cc2538-hal 0.1.1...
[INFO] testing cc2538-hal-0.1.1 against 1.60.0 for beta-1.61-1
[INFO] extracting crate cc2538-hal 0.1.1 into /workspace/builds/worker-21/source
[INFO] validating manifest of crates.io crate cc2538-hal 0.1.1 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-21/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-21/source/rust-toolchain
[INFO] started tweaking crates.io crate cc2538-hal 0.1.1
[INFO] finished tweaking crates.io crate cc2538-hal 0.1.1
[INFO] tweaked toml for crates.io crate cc2538-hal 0.1.1 written to /workspace/builds/worker-21/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded circular-queue v0.2.6
[INFO] [stderr]   Downloaded alloc-cortex-m v0.4.2
[INFO] [stderr]   Downloaded embedded-hal v1.0.0-alpha.5
[INFO] [stderr]   Downloaded cc2538-pac v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 573bf7fa5dc37b25f62a4711a9a67f7bb4396bd92cedfb5aaa6fd025a720462e
[INFO] running `Command { std: "docker" "start" "-a" "573bf7fa5dc37b25f62a4711a9a67f7bb4396bd92cedfb5aaa6fd025a720462e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "573bf7fa5dc37b25f62a4711a9a67f7bb4396bd92cedfb5aaa6fd025a720462e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "573bf7fa5dc37b25f62a4711a9a67f7bb4396bd92cedfb5aaa6fd025a720462e", kill_on_drop: false }`
[INFO] [stdout] 573bf7fa5dc37b25f62a4711a9a67f7bb4396bd92cedfb5aaa6fd025a720462e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4e84ddcd0d1f646a9e1ce460e8334c7de6f61752e9c0382801f0dd18f07252e8
[INFO] running `Command { std: "docker" "start" "-a" "4e84ddcd0d1f646a9e1ce460e8334c7de6f61752e9c0382801f0dd18f07252e8", kill_on_drop: false }`
[INFO] [stderr]    Compiling nb v1.0.0
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling cortex-m v0.7.4
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling cortex-m-rt v0.7.1
[INFO] [stderr]    Compiling vcell v0.1.3
[INFO] [stderr]    Compiling bitfield v0.13.2
[INFO] [stderr]    Compiling cc2538-pac v0.1.2
[INFO] [stderr]    Compiling bare-metal v1.0.0
[INFO] [stderr]    Compiling linked_list_allocator v0.8.11
[INFO] [stderr]    Compiling paste v1.0.7
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling circular-queue v0.2.6
[INFO] [stderr]    Compiling nb v0.1.3
[INFO] [stderr]    Compiling embedded-hal v1.0.0-alpha.5
[INFO] [stderr]    Compiling rustc_version v0.2.3
[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/linked_list_allocator-0.8.11/src/lib.rs:1:41
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "const_mut_refs", feature(const_mut_refs))]
[INFO] [stdout]   |                                         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling volatile-register v0.2.1
[INFO] [stderr]    Compiling embedded-hal v0.2.7
[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 `linked_list_allocator` 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" "4e84ddcd0d1f646a9e1ce460e8334c7de6f61752e9c0382801f0dd18f07252e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e84ddcd0d1f646a9e1ce460e8334c7de6f61752e9c0382801f0dd18f07252e8", kill_on_drop: false }`
[INFO] [stdout] 4e84ddcd0d1f646a9e1ce460e8334c7de6f61752e9c0382801f0dd18f07252e8