Dec 18 12:50:31.125 INFO checking proc_macro_helper-0.3.0 against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 12:50:31.125 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-3/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/reg/proc_macro_helper/0.3.0:/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 12:50:31.494 INFO [stdout] e64cbdd5bedf0f3a278179c24c9cc5a3be29f8de85208ef175a0e4876e051190
Dec 18 12:50:31.498 INFO running `"docker" "start" "-a" "e64cbdd5bedf0f3a278179c24c9cc5a3be29f8de85208ef175a0e4876e051190"`
Dec 18 12:50:32.036 INFO [stderr]     Checking syn v0.15.23
Dec 18 12:50:35.968 INFO [stderr]     Checking proc_macro_helper v0.3.0 (/opt/crater/workdir)
Dec 18 12:50:36.542 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.53s
Dec 18 12:50:37.124 INFO running `"docker" "inspect" "e64cbdd5bedf0f3a278179c24c9cc5a3be29f8de85208ef175a0e4876e051190"`
Dec 18 12:50:37.249 INFO running `"docker" "rm" "-f" "e64cbdd5bedf0f3a278179c24c9cc5a3be29f8de85208ef175a0e4876e051190"`
Dec 18 12:50:37.341 INFO [stdout] e64cbdd5bedf0f3a278179c24c9cc5a3be29f8de85208ef175a0e4876e051190