Dec 02 10:00:10.800 INFO testing 0x7CFE/cortex against master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61 for beta-1.31-5
Dec 02 10:00:10.800 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-5/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/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 10:00:11.316 INFO [stdout] fd813b5ff3b2b21ea9f50d3e7499aa97c37152dbbc951d1c6901448b75a04756
Dec 02 10:00:11.319 INFO running `"docker" "start" "-a" "fd813b5ff3b2b21ea9f50d3e7499aa97c37152dbbc951d1c6901448b75a04756"`
Dec 02 10:00:12.910 INFO [stderr] usermod: no changes
Dec 02 10:00:13.122 INFO [stderr]    Compiling sample v0.6.2
Dec 02 10:00:13.131 INFO [stderr]    Compiling num-complex v0.1.37
Dec 02 10:00:13.131 INFO [stderr]    Compiling bincode v1.0.0-alpha7
Dec 02 10:00:13.131 INFO [stderr]    Compiling serde_derive v0.9.14
Dec 02 10:00:16.896 INFO [stderr]    Compiling dft v0.5.4
Dec 02 10:00:29.128 INFO [stderr]    Compiling cortex v0.1.0 (/source)
Dec 02 10:00:30.626 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 10:00:30.627 INFO [stderr]  --> src/main.rs:2:1
Dec 02 10:00:30.627 INFO [stderr]   |
Dec 02 10:00:30.627 INFO [stderr] 2 | #![feature(btree_range, collections_bound)]
Dec 02 10:00:30.627 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 10:00:30.627 INFO [stderr] 
Dec 02 10:00:30.627 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 10:00:30.627 INFO [stderr]  --> src/main.rs:3:1
Dec 02 10:00:30.635 INFO [stderr]   |
Dec 02 10:00:30.635 INFO [stderr] 3 | #![feature(conservative_impl_trait)]
Dec 02 10:00:30.635 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 10:00:30.635 INFO [stderr] 
Dec 02 10:00:30.639 INFO [stderr] error: aborting due to 2 previous errors
Dec 02 10:00:30.639 INFO [stderr] 
Dec 02 10:00:30.639 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 10:00:30.642 INFO [stderr] error: Could not compile `cortex`.
Dec 02 10:00:30.642 INFO [stderr] 
Dec 02 10:00:30.642 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 10:00:30.643 INFO [stderr] su: No module specific data is present
Dec 02 10:00:31.143 INFO running `"docker" "inspect" "fd813b5ff3b2b21ea9f50d3e7499aa97c37152dbbc951d1c6901448b75a04756"`
Dec 02 10:00:31.361 INFO running `"docker" "rm" "-f" "fd813b5ff3b2b21ea9f50d3e7499aa97c37152dbbc951d1c6901448b75a04756"`
Dec 02 10:00:31.565 INFO [stdout] fd813b5ff3b2b21ea9f50d3e7499aa97c37152dbbc951d1c6901448b75a04756