Dec 02 12:22:54.265 INFO testing unsafe_unwrap-0.1.0 against master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61 for beta-1.31-5
Dec 02 12:22:54.265 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 02 12:22:54.623 INFO [stdout] cd9250442c3baef4197f567b757688b1e952a836cd2dae5fa2968b34447068ae
Dec 02 12:22:54.625 INFO running `"docker" "start" "-a" "cd9250442c3baef4197f567b757688b1e952a836cd2dae5fa2968b34447068ae"`
Dec 02 12:22:55.612 INFO [stderr] usermod: no changes
Dec 02 12:22:55.661 INFO [stderr]    Compiling unsafe_unwrap v0.1.0 (/source)
Dec 02 12:22:55.899 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.27s
Dec 02 12:22:55.899 INFO [stderr] su: No module specific data is present
Dec 02 12:22:56.667 INFO running `"docker" "inspect" "cd9250442c3baef4197f567b757688b1e952a836cd2dae5fa2968b34447068ae"`
Dec 02 12:22:56.860 INFO running `"docker" "rm" "-f" "cd9250442c3baef4197f567b757688b1e952a836cd2dae5fa2968b34447068ae"`
Dec 02 12:22:57.042 INFO [stdout] cd9250442c3baef4197f567b757688b1e952a836cd2dae5fa2968b34447068ae
Dec 02 12:22:57.045 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 test --frozen --no-run" "-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 12:22:57.311 INFO [stdout] 643466f2b633b48e5bae43bb36574a864ad9eb71ecbd260f0cbfe9c0e5149afd
Dec 02 12:22:57.316 INFO running `"docker" "start" "-a" "643466f2b633b48e5bae43bb36574a864ad9eb71ecbd260f0cbfe9c0e5149afd"`
Dec 02 12:22:58.285 INFO [stderr] usermod: no changes
Dec 02 12:22:58.325 INFO [stderr]    Compiling unsafe_unwrap v0.1.0 (/source)
Dec 02 12:22:58.814 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 12:22:58.814 INFO [stderr]   --> src/lib.rs:23:19
Dec 02 12:22:58.815 INFO [stderr]    |
Dec 02 12:22:58.815 INFO [stderr] 23 | #![cfg_attr(test, feature(test))]
Dec 02 12:22:58.815 INFO [stderr]    |                   ^^^^^^^^^^^^^
Dec 02 12:22:58.815 INFO [stderr] 
Dec 02 12:22:58.815 INFO [stderr] error: aborting due to previous error
Dec 02 12:22:58.815 INFO [stderr] 
Dec 02 12:22:58.815 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 12:22:58.820 INFO [stderr] error: Could not compile `unsafe_unwrap`.
Dec 02 12:22:58.821 INFO [stderr] 
Dec 02 12:22:58.821 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 12:22:58.821 INFO [stderr] su: No module specific data is present
Dec 02 12:22:59.129 INFO running `"docker" "inspect" "643466f2b633b48e5bae43bb36574a864ad9eb71ecbd260f0cbfe9c0e5149afd"`
Dec 02 12:22:59.232 INFO running `"docker" "rm" "-f" "643466f2b633b48e5bae43bb36574a864ad9eb71ecbd260f0cbfe9c0e5149afd"`
Dec 02 12:22:59.323 INFO [stdout] 643466f2b633b48e5bae43bb36574a864ad9eb71ecbd260f0cbfe9c0e5149afd