Dec 02 07:43:35.203 INFO testing Flecheck/Sudoku against 1.30.1 for beta-1.31-5
Dec 02 07:43:35.203 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-2/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/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 07:43:35.789 INFO [stdout] a39c9b4205bdb783371f53be7399b440475d6badaca1e54b8227b6e59ed8af62
Dec 02 07:43:35.791 INFO running `"docker" "start" "-a" "a39c9b4205bdb783371f53be7399b440475d6badaca1e54b8227b6e59ed8af62"`
Dec 02 07:43:37.542 INFO [stderr] usermod: no changes
Dec 02 07:43:37.659 INFO [stderr]    Compiling indexmap v0.4.1
Dec 02 07:43:39.375 INFO [stderr]    Compiling priority-queue v0.5.1
Dec 02 07:43:40.235 INFO [stderr]    Compiling sudoku v0.1.0 (/source)
Dec 02 07:43:40.975 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 07:43:40.975 INFO [stderr]  --> src/main.rs:1:1
Dec 02 07:43:40.975 INFO [stderr]   |
Dec 02 07:43:40.975 INFO [stderr] 1 | #![feature(const_fn, nll)]
Dec 02 07:43:40.975 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 07:43:40.975 INFO [stderr] 
Dec 02 07:43:40.976 INFO [stderr] error: aborting due to previous error
Dec 02 07:43:40.976 INFO [stderr] 
Dec 02 07:43:40.976 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 07:43:40.988 INFO [stderr] error: Could not compile `sudoku`.
Dec 02 07:43:40.988 INFO [stderr] 
Dec 02 07:43:40.988 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 07:43:40.990 INFO [stderr] su: No module specific data is present
Dec 02 07:43:42.473 INFO running `"docker" "inspect" "a39c9b4205bdb783371f53be7399b440475d6badaca1e54b8227b6e59ed8af62"`
Dec 02 07:43:42.831 INFO running `"docker" "rm" "-f" "a39c9b4205bdb783371f53be7399b440475d6badaca1e54b8227b6e59ed8af62"`
Dec 02 07:43:43.151 INFO [stdout] a39c9b4205bdb783371f53be7399b440475d6badaca1e54b8227b6e59ed8af62