Dec 02 14:44:21.232 INFO testing tao-of-rust-0.1.0 against master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61 for beta-1.31-5
Dec 02 14:44:21.232 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 14:44:21.489 INFO [stdout] 4bc3defcac1e9cf606dd26305275bbab5b14e62db77b48204661004ee9c4228f
Dec 02 14:44:21.491 INFO running `"docker" "start" "-a" "4bc3defcac1e9cf606dd26305275bbab5b14e62db77b48204661004ee9c4228f"`
Dec 02 14:44:22.046 INFO [stderr] usermod: no changes
Dec 02 14:44:22.125 INFO [stderr]    Compiling csv_challenge v0.1.0
Dec 02 14:44:22.125 INFO [stderr]    Compiling failures_crate v0.1.0
Dec 02 14:44:23.662 INFO [stderr]    Compiling tao-of-rust v0.1.0 (/source)
Dec 02 14:44:25.839 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 14:44:25.839 INFO [stderr]  --> src/lib.rs:1:1
Dec 02 14:44:25.839 INFO [stderr]   |
Dec 02 14:44:25.839 INFO [stderr] 1 | #![feature(const_fn)]
Dec 02 14:44:25.839 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
Dec 02 14:44:25.839 INFO [stderr] 
Dec 02 14:44:25.839 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 14:44:25.839 INFO [stderr]  --> src/lib.rs:2:1
Dec 02 14:44:25.839 INFO [stderr]   |
Dec 02 14:44:25.839 INFO [stderr] 2 | #![feature(never_type)]
Dec 02 14:44:25.839 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 14:44:25.839 INFO [stderr] 
Dec 02 14:44:25.839 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 14:44:25.839 INFO [stderr]  --> src/lib.rs:3:1
Dec 02 14:44:25.839 INFO [stderr]   |
Dec 02 14:44:25.839 INFO [stderr] 3 | #![feature(specialization)]
Dec 02 14:44:25.839 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 14:44:25.839 INFO [stderr] 
Dec 02 14:44:25.839 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 14:44:25.839 INFO [stderr]  --> src/lib.rs:4:1
Dec 02 14:44:25.839 INFO [stderr]   |
Dec 02 14:44:25.839 INFO [stderr] 4 | #![feature(unboxed_closures, fn_traits)]
Dec 02 14:44:25.839 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 14:44:25.839 INFO [stderr] 
Dec 02 14:44:25.883 INFO [stderr] error: aborting due to 4 previous errors
Dec 02 14:44:25.883 INFO [stderr] 
Dec 02 14:44:25.883 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 14:44:25.887 INFO [stderr] error: Could not compile `tao-of-rust`.
Dec 02 14:44:25.887 INFO [stderr] 
Dec 02 14:44:25.887 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 14:44:25.892 INFO [stderr] su: No module specific data is present
Dec 02 14:44:26.596 INFO running `"docker" "inspect" "4bc3defcac1e9cf606dd26305275bbab5b14e62db77b48204661004ee9c4228f"`
Dec 02 14:44:26.848 INFO running `"docker" "rm" "-f" "4bc3defcac1e9cf606dd26305275bbab5b14e62db77b48204661004ee9c4228f"`
Dec 02 14:44:27.145 INFO [stdout] 4bc3defcac1e9cf606dd26305275bbab5b14e62db77b48204661004ee9c4228f