Dec 03 18:57:29.178 INFO testing atsamd21g18a-0.3.1 against 1.30.1 for beta-1.31-5
Dec 03 18:57:29.178 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-6/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/beta-1.31-5/1.30.1:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +1.30.1 build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 03 18:57:29.414 INFO [stdout] 72f4765a858f2cfdfbe3701a24111710560ad15072aa432c544be6c59a4e1f90
Dec 03 18:57:29.416 INFO running `"docker" "start" "-a" "72f4765a858f2cfdfbe3701a24111710560ad15072aa432c544be6c59a4e1f90"`
Dec 03 18:57:30.634 INFO [stderr] usermod: no changes
Dec 03 18:57:30.831 INFO [stderr]    Compiling atsamd21g18a v0.3.1 (/source)
Dec 03 18:57:34.403 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 18:57:34.403 INFO [stderr]  --> src/lib.rs:5:1
Dec 03 18:57:34.403 INFO [stderr]   |
Dec 03 18:57:34.403 INFO [stderr] 5 | #![feature(untagged_unions)]
Dec 03 18:57:34.403 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 03 18:57:34.403 INFO [stderr] 
Dec 03 18:57:34.611 INFO [stderr] error: aborting due to previous error
Dec 03 18:57:34.611 INFO [stderr] 
Dec 03 18:57:34.611 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 03 18:57:34.639 INFO [stderr] error: Could not compile `atsamd21g18a`.
Dec 03 18:57:34.639 INFO [stderr] 
Dec 03 18:57:34.639 INFO [stderr] To learn more, run the command again with --verbose.
Dec 03 18:57:34.639 INFO [stderr] su: No module specific data is present
Dec 03 18:57:35.168 INFO running `"docker" "inspect" "72f4765a858f2cfdfbe3701a24111710560ad15072aa432c544be6c59a4e1f90"`
Dec 03 18:57:35.375 INFO running `"docker" "rm" "-f" "72f4765a858f2cfdfbe3701a24111710560ad15072aa432c544be6c59a4e1f90"`
Dec 03 18:57:35.576 INFO [stdout] 72f4765a858f2cfdfbe3701a24111710560ad15072aa432c544be6c59a4e1f90