Dec 18 14:39:49.192 INFO checking kg-display-derive-0.1.0 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 14:39:49.193 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-4/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/kg-display-derive/0.1.0:/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 14:39:49.501 INFO [stdout] d38ec8dbb5d8a0259540ba84fead2f9bcd351f709fe212ac317b8a945054f7e2
Dec 18 14:39:49.505 INFO running `"docker" "start" "-a" "d38ec8dbb5d8a0259540ba84fead2f9bcd351f709fe212ac317b8a945054f7e2"`
Dec 18 14:39:50.508 INFO [stderr]    Compiling heapsize v0.4.2
Dec 18 14:39:50.512 INFO [stderr]    Compiling memchr v2.1.2
Dec 18 14:39:50.516 INFO [stderr]     Checking kg-utils v0.2.3
Dec 18 14:39:50.516 INFO [stderr]    Compiling syn v0.15.23
Dec 18 14:39:50.516 INFO [stderr]     Checking kg-display v0.1.1
Dec 18 14:39:53.184 INFO [stderr] error[E0658]: use of unstable library feature 'alloc_layout_extra' (see issue #55724)
Dec 18 14:39:53.184 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 14:39:53.184 INFO [stderr]     |
Dec 18 14:39:53.184 INFO [stderr] 231 |     match Layout::array::<T>(size) {
Dec 18 14:39:53.184 INFO [stderr]     |           ^^^^^^^^^^^^^^^^^^
Dec 18 14:39:53.184 INFO [stderr]     |
Dec 18 14:39:53.184 INFO [stderr]     = help: add #![feature(alloc_layout_extra)] to the crate attributes to enable
Dec 18 14:39:53.184 INFO [stderr] 
Dec 18 14:39:53.736 INFO [stderr] error: aborting due to previous error
Dec 18 14:39:53.736 INFO [stderr] 
Dec 18 14:39:53.736 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 18 14:39:53.760 INFO [stderr] error: Could not compile `kg-utils`.
Dec 18 14:39:53.760 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 18 14:39:54.891 INFO [stderr] error[E0658]: use of unstable library feature 'alloc_layout_extra' (see issue #55724)
Dec 18 14:39:54.892 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 14:39:54.892 INFO [stderr]     |
Dec 18 14:39:54.892 INFO [stderr] 231 |     match Layout::array::<T>(size) {
Dec 18 14:39:54.893 INFO [stderr]     |           ^^^^^^^^^^^^^^^^^^
Dec 18 14:39:54.893 INFO [stderr]     |
Dec 18 14:39:54.893 INFO [stderr]     = help: add #![feature(alloc_layout_extra)] to the crate attributes to enable
Dec 18 14:39:54.894 INFO [stderr] 
Dec 18 14:39:55.184 INFO [stderr] error: aborting due to previous error
Dec 18 14:39:55.184 INFO [stderr] 
Dec 18 14:39:55.184 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 18 14:39:55.218 INFO [stderr] error: Could not compile `kg-utils`.
Dec 18 14:39:55.218 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 18 14:40:13.752 INFO [stderr] error: build failed
Dec 18 14:40:14.622 INFO running `"docker" "inspect" "d38ec8dbb5d8a0259540ba84fead2f9bcd351f709fe212ac317b8a945054f7e2"`
Dec 18 14:40:14.840 INFO running `"docker" "rm" "-f" "d38ec8dbb5d8a0259540ba84fead2f9bcd351f709fe212ac317b8a945054f7e2"`
Dec 18 14:40:15.186 INFO [stdout] d38ec8dbb5d8a0259540ba84fead2f9bcd351f709fe212ac317b8a945054f7e2