Dec 02 16:29:39.474 INFO testing slot-0.2.5 against 1.30.1 for beta-1.31-5
Dec 02 16:29:39.474 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-7/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-7/beta-1.31-5/1.30.1:/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 +1.30.1 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 16:29:39.660 INFO [stdout] b8ac2341cc5b0dfd6f2b8c8021e620c2b805c50336c15e3d88a2e3e903bb4807
Dec 02 16:29:39.662 INFO running `"docker" "start" "-a" "b8ac2341cc5b0dfd6f2b8c8021e620c2b805c50336c15e3d88a2e3e903bb4807"`
Dec 02 16:29:40.119 INFO [stderr] usermod: no changes
Dec 02 16:29:40.155 INFO [stderr]    Compiling slot v0.2.5 (/source)
Dec 02 16:29:40.214 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 16:29:40.215 INFO [stderr]  --> src/lib.rs:3:1
Dec 02 16:29:40.215 INFO [stderr]   |
Dec 02 16:29:40.215 INFO [stderr] 3 | #![feature(const_fn)]
Dec 02 16:29:40.215 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
Dec 02 16:29:40.215 INFO [stderr] 
Dec 02 16:29:40.215 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 16:29:40.215 INFO [stderr]  --> src/lib.rs:4:1
Dec 02 16:29:40.215 INFO [stderr]   |
Dec 02 16:29:40.215 INFO [stderr] 4 | #![feature(const_fn_union)]
Dec 02 16:29:40.215 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 16:29:40.215 INFO [stderr] 
Dec 02 16:29:40.215 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 16:29:40.215 INFO [stderr]  --> src/lib.rs:5:1
Dec 02 16:29:40.215 INFO [stderr]   |
Dec 02 16:29:40.215 INFO [stderr] 5 | #![feature(untagged_unions)]
Dec 02 16:29:40.215 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 16:29:40.215 INFO [stderr] 
Dec 02 16:29:40.215 INFO [stderr] error: aborting due to 3 previous errors
Dec 02 16:29:40.215 INFO [stderr] 
Dec 02 16:29:40.215 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 16:29:40.217 INFO [stderr] error: Could not compile `slot`.
Dec 02 16:29:40.217 INFO [stderr] 
Dec 02 16:29:40.217 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 16:29:40.218 INFO [stderr] su: No module specific data is present
Dec 02 16:29:41.214 INFO running `"docker" "inspect" "b8ac2341cc5b0dfd6f2b8c8021e620c2b805c50336c15e3d88a2e3e903bb4807"`
Dec 02 16:29:41.484 INFO running `"docker" "rm" "-f" "b8ac2341cc5b0dfd6f2b8c8021e620c2b805c50336c15e3d88a2e3e903bb4807"`
Dec 02 16:29:41.939 INFO [stdout] b8ac2341cc5b0dfd6f2b8c8021e620c2b805c50336c15e3d88a2e3e903bb4807