[INFO] fetching crate ruduino 0.2.6...
[INFO] testing ruduino-0.2.6 against beta-2020-10-09 for beta-1.48-1
[INFO] extracting crate ruduino 0.2.6 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate ruduino 0.2.6 on toolchain beta-2020-10-09
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ruduino 0.2.6
[INFO] finished tweaking crates.io crate ruduino 0.2.6
[INFO] tweaked toml for crates.io crate ruduino 0.2.6 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate ruduino 0.2.6 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded target-cpu-fetch v0.1.1
[INFO] [stderr]   Downloaded target-cpu-macro v0.1.1
[INFO] [stderr]   Downloaded xmltree v0.10.1
[INFO] [stderr]   Downloaded avr-std-stub v1.0.0
[INFO] [stderr]   Downloaded avr-mcu v0.3.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b7c76b8c6498fce80014a6035986523d20d37a9fedc60d762014f837d054d22c
[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" "b7c76b8c6498fce80014a6035986523d20d37a9fedc60d762014f837d054d22c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b7c76b8c6498fce80014a6035986523d20d37a9fedc60d762014f837d054d22c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7c76b8c6498fce80014a6035986523d20d37a9fedc60d762014f837d054d22c", kill_on_drop: false }`
[INFO] [stdout] b7c76b8c6498fce80014a6035986523d20d37a9fedc60d762014f837d054d22c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a09296badd80068548d9721776919750b0d17382328272a0e147a50dbd7eb6c2
[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" "a09296badd80068548d9721776919750b0d17382328272a0e147a50dbd7eb6c2", kill_on_drop: false }`
[INFO] [stderr]    Compiling json v0.12.4
[INFO] [stderr]    Compiling avr-std-stub v1.0.0
[INFO] [stderr]    Compiling xmltree v0.10.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/avr-std-stub-1.0.0/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(lang_items)]
[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 `avr-std-stub`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "a09296badd80068548d9721776919750b0d17382328272a0e147a50dbd7eb6c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a09296badd80068548d9721776919750b0d17382328272a0e147a50dbd7eb6c2", kill_on_drop: false }`
[INFO] [stdout] a09296badd80068548d9721776919750b0d17382328272a0e147a50dbd7eb6c2
