Dec 02 20:38:53.067 INFO testing register-0.2.1 against 1.30.1 for beta-1.31-5
Dec 02 20:38:53.067 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-1/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/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 20:38:53.423 INFO [stdout] e5a7c8007af1123f1a66f19661d67c3f81e35d0bfba1c929e89ceb3f545bfaab
Dec 02 20:38:53.423 INFO running `"docker" "start" "-a" "e5a7c8007af1123f1a66f19661d67c3f81e35d0bfba1c929e89ceb3f545bfaab"`
Dec 02 20:38:54.129 INFO [stderr] usermod: no changes
Dec 02 20:38:54.167 INFO [stderr]    Compiling tock-registers v0.2.0
Dec 02 20:38:54.243 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 20:38:54.243 INFO [stderr]  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/tock-registers-0.2.0/src/lib.rs:5:1
Dec 02 20:38:54.243 INFO [stderr]   |
Dec 02 20:38:54.244 INFO [stderr] 5 | #![feature(const_fn)]
Dec 02 20:38:54.244 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
Dec 02 20:38:54.244 INFO [stderr] 
Dec 02 20:38:54.244 INFO [stderr] error: aborting due to previous error
Dec 02 20:38:54.244 INFO [stderr] 
Dec 02 20:38:54.244 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 20:38:54.249 INFO [stderr] error: Could not compile `tock-registers`.
Dec 02 20:38:54.249 INFO [stderr] 
Dec 02 20:38:54.249 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 20:38:54.251 INFO [stderr] su: No module specific data is present
Dec 02 20:38:54.655 INFO running `"docker" "inspect" "e5a7c8007af1123f1a66f19661d67c3f81e35d0bfba1c929e89ceb3f545bfaab"`
Dec 02 20:38:54.787 INFO running `"docker" "rm" "-f" "e5a7c8007af1123f1a66f19661d67c3f81e35d0bfba1c929e89ceb3f545bfaab"`
Dec 02 20:38:54.986 INFO [stdout] e5a7c8007af1123f1a66f19661d67c3f81e35d0bfba1c929e89ceb3f545bfaab