[INFO] cloning repository samdolt/cortex-m0
[INFO] running `"git" "clone" "--bare" "git://github.com/samdolt/cortex-m0.git" "work/cache/sources/gh/samdolt/cortex-m0"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/samdolt/cortex-m0'...
[INFO] running `"git" "clone" "work/cache/sources/gh/samdolt/cortex-m0" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/samdolt/cortex-m0"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/samdolt/cortex-m0'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/samdolt/cortex-m0" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/samdolt/cortex-m0"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/samdolt/cortex-m0'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 096e2edbddc76996064dfe0bc890c8f1f4ae0c93
[INFO] sha for GitHub repo samdolt/cortex-m0: 096e2edbddc76996064dfe0bc890c8f1f4ae0c93
[INFO] validating manifest of samdolt/cortex-m0 on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of samdolt/cortex-m0 on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing samdolt/cortex-m0
[INFO] finished frobbing samdolt/cortex-m0
[INFO] frobbed toml for samdolt/cortex-m0 written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/samdolt/cortex-m0/Cargo.toml
[INFO] started frobbing samdolt/cortex-m0
[INFO] finished frobbing samdolt/cortex-m0
[INFO] frobbed toml for samdolt/cortex-m0 written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/samdolt/cortex-m0/Cargo.toml
[INFO] crate samdolt/cortex-m0 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded volatile-register v0.1.2
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking samdolt/cortex-m0 against master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-0/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/samdolt/cortex-m0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] e8a1c55f17f476767ecebaa36e7c54bcd4ed0b4b84afa682fa50d2c94bd1aa86
[INFO] running `"docker" "start" "-a" "e8a1c55f17f476767ecebaa36e7c54bcd4ed0b4b84afa682fa50d2c94bd1aa86"`
[INFO] [stderr]     Checking volatile-register v0.1.2
[INFO] [stderr]     Checking cortex-m0 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0522]: definition of an unknown language item: `panic_fmt`
[INFO] [stderr]    --> src/main.rs:199:5
[INFO] [stderr]     |
[INFO] [stderr] 199 |     #[lang = "panic_fmt"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^ definition of unknown language item `panic_fmt`
[INFO] [stderr] 
[INFO] [stderr] error[E0522]: definition of an unknown language item: `panic_fmt`
[INFO] [stderr]    --> src/main.rs:199:5
[INFO] [stderr]     |
[INFO] [stderr] 199 |     #[lang = "panic_fmt"]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^ definition of unknown language item `panic_fmt`
[INFO] [stderr] 
[INFO] [stderr] error: `#[panic_handler]` function required, but not found
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0522`.
[INFO] [stderr] error: Could not compile `cortex-m0`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0522`.
[INFO] [stderr] error: Could not compile `cortex-m0`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e8a1c55f17f476767ecebaa36e7c54bcd4ed0b4b84afa682fa50d2c94bd1aa86"`
[INFO] running `"docker" "rm" "-f" "e8a1c55f17f476767ecebaa36e7c54bcd4ed0b4b84afa682fa50d2c94bd1aa86"`
[INFO] [stdout] e8a1c55f17f476767ecebaa36e7c54bcd4ed0b4b84afa682fa50d2c94bd1aa86