Dec 18 14:39:39.616 INFO checking kg-tree-0.1.1 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 14:39:39.617 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-2/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/kg-tree/0.1.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 14:39:39.984 INFO [stdout] d619186119eace97db8fdf23430f63b3990adb1cabd0e70d619a2e5051545586
Dec 18 14:39:39.990 INFO running `"docker" "start" "-a" "d619186119eace97db8fdf23430f63b3990adb1cabd0e70d619a2e5051545586"`
Dec 18 14:39:41.132 INFO [stderr]     Checking assert_approx_eq v1.0.0
Dec 18 14:39:41.135 INFO [stderr]    Compiling memchr v2.1.2
Dec 18 14:39:41.137 INFO [stderr]    Compiling kg-utils v0.2.3
Dec 18 14:39:41.137 INFO [stderr]    Compiling synstructure v0.5.2
Dec 18 14:39:41.137 INFO [stderr]    Compiling syn v0.15.23
Dec 18 14:39:41.138 INFO [stderr]     Checking kg-display v0.1.1
Dec 18 14:39:41.138 INFO [stderr]     Checking parking_lot_core v0.3.1
Dec 18 14:39:43.192 INFO [stderr] error[E0658]: use of unstable library feature 'alloc_layout_extra' (see issue #55724)
Dec 18 14:39:43.192 INFO [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/kg-utils-0.2.3/src/collections/sparse_set.rs:231:11
Dec 18 14:39:43.192 INFO [stderr]     |
Dec 18 14:39:43.192 INFO [stderr] 231 |     match Layout::array::<T>(size) {
Dec 18 14:39:43.192 INFO [stderr]     |           ^^^^^^^^^^^^^^^^^^
Dec 18 14:39:43.223 INFO [stderr]     |
Dec 18 14:39:43.223 INFO [stderr]     = help: add #![feature(alloc_layout_extra)] to the crate attributes to enable
Dec 18 14:39:43.223 INFO [stderr] 
Dec 18 14:39:43.686 INFO [stderr] error[E0658]: use of unstable library feature 'alloc_layout_extra' (see issue #55724)
Dec 18 14:39:43.688 INFO [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/kg-utils-0.2.3/src/collections/sparse_set.rs:231:11
Dec 18 14:39:43.688 INFO [stderr]     |
Dec 18 14:39:43.688 INFO [stderr] 231 |     match Layout::array::<T>(size) {
Dec 18 14:39:43.688 INFO [stderr]     |           ^^^^^^^^^^^^^^^^^^
Dec 18 14:39:43.688 INFO [stderr]     |
Dec 18 14:39:43.688 INFO [stderr]     = help: add #![feature(alloc_layout_extra)] to the crate attributes to enable
Dec 18 14:39:43.688 INFO [stderr] 
Dec 18 14:39:43.920 INFO [stderr]    Compiling heapsize_derive v0.1.4
Dec 18 14:39:43.987 INFO [stderr]    Compiling nom v4.1.1
Dec 18 14:39:44.076 INFO [stderr] error: aborting due to previous error
Dec 18 14:39:44.076 INFO [stderr] 
Dec 18 14:39:44.076 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 18 14:39:44.105 INFO [stderr] error: Could not compile `kg-utils`.
Dec 18 14:39:44.105 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 18 14:39:44.324 INFO [stderr] error: aborting due to previous error
Dec 18 14:39:44.324 INFO [stderr] 
Dec 18 14:39:44.324 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 18 14:39:44.328 INFO [stderr] error: Could not compile `kg-utils`.
Dec 18 14:39:44.328 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 18 14:40:05.016 INFO [stderr] error: build failed
Dec 18 14:40:05.856 INFO running `"docker" "inspect" "d619186119eace97db8fdf23430f63b3990adb1cabd0e70d619a2e5051545586"`
Dec 18 14:40:06.116 INFO running `"docker" "rm" "-f" "d619186119eace97db8fdf23430f63b3990adb1cabd0e70d619a2e5051545586"`
Dec 18 14:40:06.409 INFO [stdout] d619186119eace97db8fdf23430f63b3990adb1cabd0e70d619a2e5051545586