Dec 19 20:44:37.054 INFO checking alexandermccormick/wasm-conways-game-of-life against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 20:44:37.054 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-2/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/alexandermccormick/wasm-conways-game-of-life:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 20:44:37.261 INFO [stdout] 18a3b506bca1565c5ffb2fe273e504629c6c519a154fbab2017d57b4b4dd3d0b
Dec 19 20:44:37.263 INFO running `"docker" "start" "-a" "18a3b506bca1565c5ffb2fe273e504629c6c519a154fbab2017d57b4b4dd3d0b"`
Dec 19 20:44:37.952 INFO [stderr]    Compiling wasm-bindgen-shared v0.2.17
Dec 19 20:44:37.952 INFO [stderr]    Compiling proc-macro2 v0.4.9
Dec 19 20:44:38.557 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Dec 19 20:44:38.557 INFO [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.9/src/unstable.rs:347:27
Dec 19 20:44:38.557 INFO [stderr]     |
Dec 19 20:44:38.557 INFO [stderr] 347 |             Span::Nightly(proc_macro::Span::def_site())
Dec 19 20:44:38.557 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 20:44:38.557 INFO [stderr]     |
Dec 19 20:44:38.557 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Dec 19 20:44:38.557 INFO [stderr] 
Dec 19 20:44:38.573 INFO [stderr] error: aborting due to previous error
Dec 19 20:44:38.574 INFO [stderr] 
Dec 19 20:44:38.574 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 19 20:44:38.583 INFO [stderr] error: Could not compile `proc-macro2`.
Dec 19 20:44:38.584 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 19 20:44:38.596 INFO [stderr] error: build failed
Dec 19 20:44:38.889 INFO running `"docker" "inspect" "18a3b506bca1565c5ffb2fe273e504629c6c519a154fbab2017d57b4b4dd3d0b"`
Dec 19 20:44:38.980 INFO running `"docker" "rm" "-f" "18a3b506bca1565c5ffb2fe273e504629c6c519a154fbab2017d57b4b4dd3d0b"`
Dec 19 20:44:39.098 INFO [stdout] 18a3b506bca1565c5ffb2fe273e504629c6c519a154fbab2017d57b4b4dd3d0b