Dec 02 16:29:38.340 INFO testing slot-0.2.5 against master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61 for beta-1.31-5
Dec 02 16:29:38.340 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-1/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/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 16:29:38.587 INFO [stdout] 56579598737e5799618b8d5cb7ab5a97c4d065d3816e244b4e6229be7a969990
Dec 02 16:29:38.590 INFO running `"docker" "start" "-a" "56579598737e5799618b8d5cb7ab5a97c4d065d3816e244b4e6229be7a969990"`
Dec 02 16:29:39.187 INFO [stderr] usermod: no changes
Dec 02 16:29:39.208 INFO [stderr]    Compiling slot v0.2.5 (/source)
Dec 02 16:29:39.265 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 16:29:39.265 INFO [stderr]  --> src/lib.rs:3:1
Dec 02 16:29:39.265 INFO [stderr]   |
Dec 02 16:29:39.265 INFO [stderr] 3 | #![feature(const_fn)]
Dec 02 16:29:39.265 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
Dec 02 16:29:39.265 INFO [stderr] 
Dec 02 16:29:39.265 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 16:29:39.265 INFO [stderr]  --> src/lib.rs:4:1
Dec 02 16:29:39.265 INFO [stderr]   |
Dec 02 16:29:39.265 INFO [stderr] 4 | #![feature(const_fn_union)]
Dec 02 16:29:39.265 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 16:29:39.266 INFO [stderr] 
Dec 02 16:29:39.266 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 16:29:39.266 INFO [stderr]  --> src/lib.rs:5:1
Dec 02 16:29:39.266 INFO [stderr]   |
Dec 02 16:29:39.266 INFO [stderr] 5 | #![feature(untagged_unions)]
Dec 02 16:29:39.266 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 16:29:39.266 INFO [stderr] 
Dec 02 16:29:39.268 INFO [stderr] error: aborting due to 3 previous errors
Dec 02 16:29:39.268 INFO [stderr] 
Dec 02 16:29:39.268 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 16:29:39.275 INFO [stderr] error: Could not compile `slot`.
Dec 02 16:29:39.275 INFO [stderr] 
Dec 02 16:29:39.275 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 16:29:39.279 INFO [stderr] su: No module specific data is present
Dec 02 16:29:39.524 INFO running `"docker" "inspect" "56579598737e5799618b8d5cb7ab5a97c4d065d3816e244b4e6229be7a969990"`
Dec 02 16:29:39.639 INFO running `"docker" "rm" "-f" "56579598737e5799618b8d5cb7ab5a97c4d065d3816e244b4e6229be7a969990"`
Dec 02 16:29:39.739 INFO [stdout] 56579598737e5799618b8d5cb7ab5a97c4d065d3816e244b4e6229be7a969990