Dec 02 08:49:46.775 INFO testing Centril/rust_strong_rc against 1.30.1 for beta-1.31-5
Dec 02 08:49:46.775 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-5/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/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 08:49:47.008 INFO [stdout] 8bf8ac4b40ff308ef8c0a3d406d53d98101ec992f433c4f441fac85758ee4509
Dec 02 08:49:47.010 INFO running `"docker" "start" "-a" "8bf8ac4b40ff308ef8c0a3d406d53d98101ec992f433c4f441fac85758ee4509"`
Dec 02 08:49:48.067 INFO [stderr] usermod: no changes
Dec 02 08:49:48.099 INFO [stderr]    Compiling strong_rc v0.1.4 (/source)
Dec 02 08:49:48.615 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 08:49:48.615 INFO [stderr]    --> src/lib.rs:120:1
Dec 02 08:49:48.615 INFO [stderr]     |
Dec 02 08:49:48.615 INFO [stderr] 120 | #![feature(unsize, coerce_unsized)]
Dec 02 08:49:48.615 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 08:49:48.615 INFO [stderr] 
Dec 02 08:49:48.615 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 08:49:48.615 INFO [stderr]    --> src/lib.rs:121:1
Dec 02 08:49:48.615 INFO [stderr]     |
Dec 02 08:49:48.615 INFO [stderr] 121 | #![feature(specialization)]
Dec 02 08:49:48.615 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 08:49:48.615 INFO [stderr] 
Dec 02 08:49:48.615 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 08:49:48.615 INFO [stderr]    --> src/lib.rs:122:1
Dec 02 08:49:48.615 INFO [stderr]     |
Dec 02 08:49:48.615 INFO [stderr] 122 | #![feature(allocator_api)]
Dec 02 08:49:48.615 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 08:49:48.615 INFO [stderr] 
Dec 02 08:49:48.615 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 08:49:48.615 INFO [stderr]    --> src/lib.rs:123:1
Dec 02 08:49:48.615 INFO [stderr]     |
Dec 02 08:49:48.615 INFO [stderr] 123 | #![feature(alloc_layout_extra)]
Dec 02 08:49:48.615 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 08:49:48.615 INFO [stderr] 
Dec 02 08:49:48.615 INFO [stderr] error: aborting due to 4 previous errors
Dec 02 08:49:48.615 INFO [stderr] 
Dec 02 08:49:48.615 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 08:49:48.621 INFO [stderr] error: Could not compile `strong_rc`.
Dec 02 08:49:48.621 INFO [stderr] 
Dec 02 08:49:48.621 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 08:49:48.622 INFO [stderr] su: No module specific data is present
Dec 02 08:49:48.912 INFO running `"docker" "inspect" "8bf8ac4b40ff308ef8c0a3d406d53d98101ec992f433c4f441fac85758ee4509"`
Dec 02 08:49:49.022 INFO running `"docker" "rm" "-f" "8bf8ac4b40ff308ef8c0a3d406d53d98101ec992f433c4f441fac85758ee4509"`
Dec 02 08:49:49.136 INFO [stdout] 8bf8ac4b40ff308ef8c0a3d406d53d98101ec992f433c4f441fac85758ee4509