[INFO] cloning repository https://github.com/theSeafarer/arduino_hal
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/theSeafarer/arduino_hal" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FtheSeafarer%2Farduino_hal", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FtheSeafarer%2Farduino_hal'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 36fdeaa5b033a5431480453ce8b4ef836c1cbb34
[INFO] testing theSeafarer/arduino_hal against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FtheSeafarer%2Farduino_hal" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/theSeafarer/arduino_hal on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/theSeafarer/arduino_hal
[INFO] finished tweaking git repo https://github.com/theSeafarer/arduino_hal
[INFO] tweaked toml for git repo https://github.com/theSeafarer/arduino_hal written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/theSeafarer/arduino_hal already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d937061514e234bef24993bdde4d12e45aa1cf4f40be444bf0576f9c34eadc59
[INFO] running `Command { std: "docker" "start" "-a" "d937061514e234bef24993bdde4d12e45aa1cf4f40be444bf0576f9c34eadc59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d937061514e234bef24993bdde4d12e45aa1cf4f40be444bf0576f9c34eadc59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d937061514e234bef24993bdde4d12e45aa1cf4f40be444bf0576f9c34eadc59", kill_on_drop: false }`
[INFO] [stdout] d937061514e234bef24993bdde4d12e45aa1cf4f40be444bf0576f9c34eadc59
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7fbe3e8ae15d80ba09960064517bc223d22ce46ee356b68441e8110c578be3e6
[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" "7fbe3e8ae15d80ba09960064517bc223d22ce46ee356b68441e8110c578be3e6", kill_on_drop: false }`
[INFO] [stderr]    Compiling nb v0.1.1
[INFO] [stderr]    Compiling ux v0.1.2
[INFO] [stderr]    Compiling embedded-hal v0.2.1
[INFO] [stderr]    Compiling arduino_hal v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(asm)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(lang_items)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::SerialError::*`
[INFO] [stdout]    --> src/serial.rs:190:13
[INFO] [stdout]     |
[INFO] [stdout] 190 |         use self::SerialError::*;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hal::spi`
[INFO] [stdout]  --> src/spi.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use hal::spi;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `hal::blocking::spi as bspi`
[INFO] [stdout]  --> src/spi.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use hal::blocking::spi as bspi;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `read_volatile`, `write_volatile`
[INFO] [stdout]  --> src/spi.rs:8:17
[INFO] [stdout]   |
[INFO] [stdout] 8 | use core::ptr::{read_volatile, write_volatile};
[INFO] [stdout]   |                 ^^^^^^^^^^^^^  ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::reg::*`
[INFO] [stdout]  --> src/spi.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use super::reg::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `arduino_hal`
[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" "7fbe3e8ae15d80ba09960064517bc223d22ce46ee356b68441e8110c578be3e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fbe3e8ae15d80ba09960064517bc223d22ce46ee356b68441e8110c578be3e6", kill_on_drop: false }`
[INFO] [stdout] 7fbe3e8ae15d80ba09960064517bc223d22ce46ee356b68441e8110c578be3e6