Dec 02 06:31:19.078 INFO testing JosephFerano/rust_os against 1.30.1 for beta-1.31-5
Dec 02 06:31:19.078 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-3/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/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 02 06:31:19.452 INFO [stdout] 9d50a7d528cf8d42415e63823589d9911ac3e08bb47f121caf78d9e2009c3397
Dec 02 06:31:19.461 INFO running `"docker" "start" "-a" "9d50a7d528cf8d42415e63823589d9911ac3e08bb47f121caf78d9e2009c3397"`
Dec 02 06:31:20.183 INFO [stderr] usermod: no changes
Dec 02 06:31:20.221 INFO [stderr]    Compiling volatile v0.2.4
Dec 02 06:31:20.221 INFO [stderr]    Compiling multiboot2 v0.7.1
Dec 02 06:31:20.786 INFO [stderr]    Compiling first_os v0.1.0 (/source)
Dec 02 06:31:20.926 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 06:31:20.926 INFO [stderr]  --> src/lib.rs:1:1
Dec 02 06:31:20.926 INFO [stderr]   |
Dec 02 06:31:20.926 INFO [stderr] 1 | #![feature(lang_items)]
Dec 02 06:31:20.926 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 06:31:20.926 INFO [stderr] 
Dec 02 06:31:20.926 INFO [stderr] error: aborting due to previous error
Dec 02 06:31:20.926 INFO [stderr] 
Dec 02 06:31:20.926 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 06:31:20.930 INFO [stderr] error: Could not compile `first_os`.
Dec 02 06:31:20.930 INFO [stderr] 
Dec 02 06:31:20.930 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 06:31:20.931 INFO [stderr] su: No module specific data is present
Dec 02 06:31:21.196 INFO running `"docker" "inspect" "9d50a7d528cf8d42415e63823589d9911ac3e08bb47f121caf78d9e2009c3397"`
Dec 02 06:31:21.290 INFO running `"docker" "rm" "-f" "9d50a7d528cf8d42415e63823589d9911ac3e08bb47f121caf78d9e2009c3397"`
Dec 02 06:31:21.402 INFO [stdout] 9d50a7d528cf8d42415e63823589d9911ac3e08bb47f121caf78d9e2009c3397