Dec 02 17:29:44.872 INFO testing serde-json-core-0.0.1 against 1.30.1 for beta-1.31-5
Dec 02 17:29:44.872 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-2/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/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 17:29:45.321 INFO [stdout] fedb1a04608839af2095729161146bc2474667b3c1acb0ff6654222cf0a8a222
Dec 02 17:29:45.327 INFO running `"docker" "start" "-a" "fedb1a04608839af2095729161146bc2474667b3c1acb0ff6654222cf0a8a222"`
Dec 02 17:29:46.223 INFO [stderr] usermod: no changes
Dec 02 17:29:46.299 INFO [stderr]    Compiling serde v1.0.80
Dec 02 17:29:46.299 INFO [stderr]    Compiling untagged-option v0.1.1
Dec 02 17:29:46.470 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 02 17:29:46.471 INFO [stderr]  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/untagged-option-0.1.1/src/lib.rs:5:1
Dec 02 17:29:46.471 INFO [stderr]   |
Dec 02 17:29:46.471 INFO [stderr] 5 | #![feature(untagged_unions, const_fn)]
Dec 02 17:29:46.471 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 17:29:46.471 INFO [stderr] 
Dec 02 17:29:46.471 INFO [stderr] error: aborting due to previous error
Dec 02 17:29:46.471 INFO [stderr] 
Dec 02 17:29:46.471 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 17:29:46.479 INFO [stderr] error: Could not compile `untagged-option`.
Dec 02 17:29:46.479 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 02 17:29:47.587 INFO [stderr] error: build failed
Dec 02 17:29:47.588 INFO [stderr] su: No module specific data is present
Dec 02 17:29:48.251 INFO running `"docker" "inspect" "fedb1a04608839af2095729161146bc2474667b3c1acb0ff6654222cf0a8a222"`
Dec 02 17:29:48.533 INFO running `"docker" "rm" "-f" "fedb1a04608839af2095729161146bc2474667b3c1acb0ff6654222cf0a8a222"`
Dec 02 17:29:48.763 INFO [stdout] fedb1a04608839af2095729161146bc2474667b3c1acb0ff6654222cf0a8a222
