[INFO] fetching crate particle-xenon 0.0.1...
[INFO] checking particle-xenon-0.0.1 against 1.55.0 for beta-1.56-3
[INFO] extracting crate particle-xenon 0.0.1 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate particle-xenon 0.0.1 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 particle-xenon 0.0.1
[INFO] finished tweaking crates.io crate particle-xenon 0.0.1
[INFO] tweaked toml for crates.io crate particle-xenon 0.0.1 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate particle-xenon 0.0.1 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]  Downloading crates ...
[INFO] [stderr]   Downloaded panic-semihosting v0.5.2
[INFO] [stderr]   Downloaded cortex-m-semihosting v0.3.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] c5964519b61cf4b190860ce0bcc77ad435a47a23ac84dc1ea626dee91209a85c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c5964519b61cf4b190860ce0bcc77ad435a47a23ac84dc1ea626dee91209a85c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c5964519b61cf4b190860ce0bcc77ad435a47a23ac84dc1ea626dee91209a85c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5964519b61cf4b190860ce0bcc77ad435a47a23ac84dc1ea626dee91209a85c", kill_on_drop: false }`
[INFO] [stdout] c5964519b61cf4b190860ce0bcc77ad435a47a23ac84dc1ea626dee91209a85c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3e6b4cfa66053672cb0a3d0329e8b64b608201da98219ae0c2d593a48e8e8ed8
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3e6b4cfa66053672cb0a3d0329e8b64b608201da98219ae0c2d593a48e8e8ed8", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]     Checking stable_deref_trait v1.1.1
[INFO] [stderr]    Compiling cortex-m v0.6.0
[INFO] [stderr]     Checking vcell v0.1.0
[INFO] [stderr]    Compiling cortex-m-rt v0.6.10
[INFO] [stderr]    Compiling nrf52840-pac v0.8.0
[INFO] [stderr]    Compiling fpa v0.1.0
[INFO] [stderr]     Checking nb v0.1.2
[INFO] [stderr]     Checking cast v0.2.2
[INFO] [stderr]    Compiling cortex-m-semihosting v0.3.4
[INFO] [stderr]    Compiling nrf52840-hal v0.8.1
[INFO] [stderr]    Compiling bare-metal v0.2.4
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.1.5
[INFO] [stderr]     Checking volatile-register v0.2.0
[INFO] [stderr]     Checking embedded-hal v0.2.3
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking as-slice v0.1.0
[INFO] [stderr]     Checking aligned v0.3.1
[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/cortex-m-0.6.0/src/lib.rs:33:37
[INFO] [stdout]    |
[INFO] [stdout] 33 | #![cfg_attr(feature = "inline-asm", 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 `cortex-m` 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" "3e6b4cfa66053672cb0a3d0329e8b64b608201da98219ae0c2d593a48e8e8ed8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e6b4cfa66053672cb0a3d0329e8b64b608201da98219ae0c2d593a48e8e8ed8", kill_on_drop: false }`
[INFO] [stdout] 3e6b4cfa66053672cb0a3d0329e8b64b608201da98219ae0c2d593a48e8e8ed8
