[INFO] fetching crate particle-xenon 0.0.1...
[INFO] testing particle-xenon-0.0.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate particle-xenon 0.0.1 into /workspace/builds/worker-0-tc1/source
[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-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate particle-xenon 0.0.1 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate particle-xenon 0.0.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded panic-semihosting v0.5.2
[INFO] [stderr]   Downloaded volatile-register v0.2.0
[INFO] [stderr]   Downloaded aligned v0.3.1
[INFO] [stderr]   Downloaded as-slice v0.1.0
[INFO] [stderr]   Downloaded vcell v0.1.0
[INFO] [stderr]   Downloaded cortex-m v0.6.0
[INFO] [stderr]   Downloaded typenum v1.10.0
[INFO] [stderr]   Downloaded cast v0.2.2
[INFO] [stderr]   Downloaded r0 v0.2.2
[INFO] [stderr]   Downloaded fpa v0.1.0
[INFO] [stderr]   Downloaded nrf52-hal-common v0.8.1
[INFO] [stderr]   Downloaded nb v0.1.2
[INFO] [stderr]   Downloaded embedded-hal v0.2.3
[INFO] [stderr]   Downloaded cortex-m-rt v0.6.10
[INFO] [stderr]   Downloaded nrf52840-hal v0.8.1
[INFO] [stderr]   Downloaded panic-halt v0.2.0
[INFO] [stderr]   Downloaded bare-metal v0.2.4
[INFO] [stderr]   Downloaded nrf52840-pac v0.8.0
[INFO] [stderr]   Downloaded cortex-m-semihosting v0.3.4
[INFO] [stderr]   Downloaded cortex-m-rt-macros v0.1.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ed559d1c5e9b9728a1ba0f7dc50461a2c8f9569a72635597df84e4ae8ba597b7
[INFO] running `Command { std: "docker" "start" "-a" "ed559d1c5e9b9728a1ba0f7dc50461a2c8f9569a72635597df84e4ae8ba597b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ed559d1c5e9b9728a1ba0f7dc50461a2c8f9569a72635597df84e4ae8ba597b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed559d1c5e9b9728a1ba0f7dc50461a2c8f9569a72635597df84e4ae8ba597b7", kill_on_drop: false }`
[INFO] [stdout] ed559d1c5e9b9728a1ba0f7dc50461a2c8f9569a72635597df84e4ae8ba597b7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3585c4b346ac93c34a0168de65d027bc32dc70c2b96a39cb5df57bfd3f757f61
[INFO] running `Command { std: "docker" "start" "-a" "3585c4b346ac93c34a0168de65d027bc32dc70c2b96a39cb5df57bfd3f757f61", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling stable_deref_trait v1.1.1
[INFO] [stderr]    Compiling cortex-m v0.6.0
[INFO] [stderr]    Compiling vcell v0.1.0
[INFO] [stderr]    Compiling cortex-m-rt v0.6.10
[INFO] [stderr]    Compiling fpa v0.1.0
[INFO] [stderr]    Compiling nrf52840-pac v0.8.0
[INFO] [stderr]    Compiling r0 v0.2.2
[INFO] [stderr]    Compiling nb v0.1.2
[INFO] [stderr]    Compiling cast v0.2.2
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling volatile-register v0.2.0
[INFO] [stderr]    Compiling nrf52840-hal v0.8.1
[INFO] [stderr]    Compiling embedded-hal v0.2.3
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bare-metal v0.2.4
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling as-slice v0.1.0
[INFO] [stderr]    Compiling 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/index.crates.io-1949cf8c6b5b557f/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] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cortex-m` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "3585c4b346ac93c34a0168de65d027bc32dc70c2b96a39cb5df57bfd3f757f61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3585c4b346ac93c34a0168de65d027bc32dc70c2b96a39cb5df57bfd3f757f61", kill_on_drop: false }`
[INFO] [stdout] 3585c4b346ac93c34a0168de65d027bc32dc70c2b96a39cb5df57bfd3f757f61