Dec 19 20:44:34.188 INFO checking alexandermccormick/wasm-conways-game-of-life against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 20:44:34.188 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-2/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/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" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 20:44:34.415 INFO [stdout] f2461745790b58322639b34e771ed2d9861a528f9e0e3b1d4c0c82f2e48cc0f2
Dec 19 20:44:34.418 INFO running `"docker" "start" "-a" "f2461745790b58322639b34e771ed2d9861a528f9e0e3b1d4c0c82f2e48cc0f2"`
Dec 19 20:44:35.483 INFO [stderr]    Compiling wasm-bindgen-shared v0.2.17
Dec 19 20:44:35.484 INFO [stderr]    Compiling proc-macro2 v0.4.9
Dec 19 20:44:36.331 INFO [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site' (see issue #54724)
Dec 19 20:44:36.331 INFO [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.9/src/unstable.rs:347:27
Dec 19 20:44:36.332 INFO [stderr]     |
Dec 19 20:44:36.332 INFO [stderr] 347 |             Span::Nightly(proc_macro::Span::def_site())
Dec 19 20:44:36.332 INFO [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 20:44:36.333 INFO [stderr]     |
Dec 19 20:44:36.333 INFO [stderr]     = help: add #![feature(proc_macro_def_site)] to the crate attributes to enable
Dec 19 20:44:36.333 INFO [stderr] 
Dec 19 20:44:36.352 INFO [stderr] error: aborting due to previous error
Dec 19 20:44:36.352 INFO [stderr] 
Dec 19 20:44:36.353 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 19 20:44:36.362 INFO [stderr] error: Could not compile `proc-macro2`.
Dec 19 20:44:36.362 INFO [stderr] 
Dec 19 20:44:36.362 INFO [stderr] To learn more, run the command again with --verbose.
Dec 19 20:44:36.778 INFO running `"docker" "inspect" "f2461745790b58322639b34e771ed2d9861a528f9e0e3b1d4c0c82f2e48cc0f2"`
Dec 19 20:44:36.895 INFO running `"docker" "rm" "-f" "f2461745790b58322639b34e771ed2d9861a528f9e0e3b1d4c0c82f2e48cc0f2"`
Dec 19 20:44:36.982 INFO [stdout] f2461745790b58322639b34e771ed2d9861a528f9e0e3b1d4c0c82f2e48cc0f2