Dec 12 12:24:35.074 INFO checking kg-tree-0.1.1 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 12:24:35.074 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-5/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/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 +3a75e80557a103497cffbcab395a2f37061a77ea-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 12 12:24:35.287 INFO [stdout] 06f3826fd456a3e0665bc7957faf7876e5184851f386e5b7ab6448eea567ff40
Dec 12 12:24:35.289 INFO running `"docker" "start" "-a" "06f3826fd456a3e0665bc7957faf7876e5184851f386e5b7ab6448eea567ff40"`
Dec 12 12:24:35.883 INFO [stderr] usermod: no changes
Dec 12 12:24:36.076 INFO [stderr]     Checking assert_approx_eq v1.0.0
Dec 12 12:24:36.092 INFO [stderr]    Compiling heapsize v0.4.2
Dec 12 12:24:36.105 INFO [stderr]    Compiling memchr v2.1.2
Dec 12 12:24:36.112 INFO [stderr]     Checking kg-utils v0.2.3
Dec 12 12:24:36.112 INFO [stderr]    Compiling syn v0.15.22
Dec 12 12:24:36.112 INFO [stderr]    Compiling heapsize_derive v0.1.4
Dec 12 12:24:36.112 INFO [stderr]     Checking kg-display v0.1.1
Dec 12 12:24:36.112 INFO [stderr]     Checking parking_lot_core v0.3.1
Dec 12 12:24:39.852 INFO [stderr] error[E0658]: use of unstable library feature 'alloc_layout_extra' (see issue #55724)
Dec 12 12:24:39.852 INFO [stderr]    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/kg-utils-0.2.3/src/collections/sparse_set.rs:231:11
Dec 12 12:24:39.852 INFO [stderr]     |
Dec 12 12:24:39.852 INFO [stderr] 231 |     match Layout::array::<T>(size) {
Dec 12 12:24:39.852 INFO [stderr]     |           ^^^^^^^^^^^^^^^^^^
Dec 12 12:24:39.852 INFO [stderr]     |
Dec 12 12:24:39.852 INFO [stderr]     = help: add #![feature(alloc_layout_extra)] to the crate attributes to enable
Dec 12 12:24:39.852 INFO [stderr] 
Dec 12 12:24:40.560 INFO [stderr] error: aborting due to previous error
Dec 12 12:24:40.560 INFO [stderr] 
Dec 12 12:24:40.561 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 12 12:24:40.592 INFO [stderr] error: Could not compile `kg-utils`.
Dec 12 12:24:40.592 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 12 12:24:44.064 INFO [stderr] error[E0658]: use of unstable library feature 'alloc_layout_extra' (see issue #55724)
Dec 12 12:24:44.064 INFO [stderr]    --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/kg-utils-0.2.3/src/collections/sparse_set.rs:231:11
Dec 12 12:24:44.064 INFO [stderr]     |
Dec 12 12:24:44.064 INFO [stderr] 231 |     match Layout::array::<T>(size) {
Dec 12 12:24:44.064 INFO [stderr]     |           ^^^^^^^^^^^^^^^^^^
Dec 12 12:24:44.064 INFO [stderr]     |
Dec 12 12:24:44.064 INFO [stderr]     = help: add #![feature(alloc_layout_extra)] to the crate attributes to enable
Dec 12 12:24:44.064 INFO [stderr] 
Dec 12 12:24:44.292 INFO [stderr] error: aborting due to previous error
Dec 12 12:24:44.292 INFO [stderr] 
Dec 12 12:24:44.292 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 12 12:24:44.299 INFO [stderr] error: Could not compile `kg-utils`.
Dec 12 12:24:44.299 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 12 12:25:00.864 INFO [stderr] error: build failed
Dec 12 12:25:00.865 INFO [stderr] su: No module specific data is present
Dec 12 12:25:01.500 INFO running `"docker" "inspect" "06f3826fd456a3e0665bc7957faf7876e5184851f386e5b7ab6448eea567ff40"`
Dec 12 12:25:01.935 INFO running `"docker" "rm" "-f" "06f3826fd456a3e0665bc7957faf7876e5184851f386e5b7ab6448eea567ff40"`
Dec 12 12:25:02.152 INFO [stdout] 06f3826fd456a3e0665bc7957faf7876e5184851f386e5b7ab6448eea567ff40