Dec 02 18:33:17.691 INFO testing rustc-ap-serialize-297.0.0 against master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61 for beta-1.31-5
Dec 02 18:33:17.692 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-0/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/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 02 18:33:18.112 INFO [stdout] a7878303d600a7f8b66eac3a7a4e143bd5a94cab5cc2a146bf21d713c0f72787
Dec 02 18:33:18.114 INFO running `"docker" "start" "-a" "a7878303d600a7f8b66eac3a7a4e143bd5a94cab5cc2a146bf21d713c0f72787"`
Dec 02 18:33:19.722 INFO [stderr] usermod: no changes
Dec 02 18:33:19.831 INFO [stderr]    Compiling smallvec v0.6.7
Dec 02 18:33:20.491 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 18:33:20.491 INFO [stderr]   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/smallvec-0.6.7/lib.rs:33:32
Dec 02 18:33:20.491 INFO [stderr]    |
Dec 02 18:33:20.491 INFO [stderr] 33 | #![cfg_attr(feature = "union", feature(untagged_unions))]
Dec 02 18:33:20.491 INFO [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 18:33:20.491 INFO [stderr] 
Dec 02 18:33:20.493 INFO [stderr] error: aborting due to previous error
Dec 02 18:33:20.493 INFO [stderr] 
Dec 02 18:33:20.493 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 18:33:20.499 INFO [stderr] error: Could not compile `smallvec`.
Dec 02 18:33:20.499 INFO [stderr] 
Dec 02 18:33:20.499 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 18:33:20.500 INFO [stderr] su: No module specific data is present
Dec 02 18:33:21.177 INFO running `"docker" "inspect" "a7878303d600a7f8b66eac3a7a4e143bd5a94cab5cc2a146bf21d713c0f72787"`
Dec 02 18:33:21.329 INFO running `"docker" "rm" "-f" "a7878303d600a7f8b66eac3a7a4e143bd5a94cab5cc2a146bf21d713c0f72787"`
Dec 02 18:33:21.451 INFO [stdout] a7878303d600a7f8b66eac3a7a4e143bd5a94cab5cc2a146bf21d713c0f72787