Dec 03 17:40:36.632 INFO testing buffering-0.2.0 against master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61 for beta-1.31-5
Dec 03 17:40:36.632 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-4/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/beta-1.31-5/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/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 +8940af3cea4a9a9deabcaf843b2f8cad9a83fc61-alt 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 17:40:36.799 INFO [stdout] d232ada1ac7e6c85d75415a0f190cd035e0a8c3d744fb573db8a221fa9e119a0
Dec 03 17:40:36.802 INFO running `"docker" "start" "-a" "d232ada1ac7e6c85d75415a0f190cd035e0a8c3d744fb573db8a221fa9e119a0"`
Dec 03 17:40:37.180 INFO [stderr] usermod: no changes
Dec 03 17:40:37.235 INFO [stderr]    Compiling buffering_nocopy_macro v0.1.0
Dec 03 17:40:41.530 INFO [stderr]    Compiling buffering v0.2.0 (/source)
Dec 03 17:40:41.982 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 03 17:40:41.982 INFO [stderr]  --> src/lib.rs:1:1
Dec 03 17:40:41.982 INFO [stderr]   |
Dec 03 17:40:41.982 INFO [stderr] 1 | #![feature(custom_attribute)]
Dec 03 17:40:41.982 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 03 17:40:41.982 INFO [stderr] 
Dec 03 17:40:41.982 INFO [stderr] error: aborting due to previous error
Dec 03 17:40:41.982 INFO [stderr] 
Dec 03 17:40:41.982 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 03 17:40:41.987 INFO [stderr] error: Could not compile `buffering`.
Dec 03 17:40:41.987 INFO [stderr] 
Dec 03 17:40:41.987 INFO [stderr] To learn more, run the command again with --verbose.
Dec 03 17:40:41.989 INFO [stderr] su: No module specific data is present
Dec 03 17:40:42.297 INFO running `"docker" "inspect" "d232ada1ac7e6c85d75415a0f190cd035e0a8c3d744fb573db8a221fa9e119a0"`
Dec 03 17:40:42.368 INFO running `"docker" "rm" "-f" "d232ada1ac7e6c85d75415a0f190cd035e0a8c3d744fb573db8a221fa9e119a0"`
Dec 03 17:40:42.465 INFO [stdout] d232ada1ac7e6c85d75415a0f190cd035e0a8c3d744fb573db8a221fa9e119a0