Dec 18 02:39:30.228 INFO checking cdouglass/morse-practice against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 02:39:30.228 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/cdouglass/morse-practice:/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 02:39:30.634 INFO [stdout] 750748d15f4fe06c90f90f75a161625d53730c7a0584489d43b615a5d9f160ad
Dec 18 02:39:30.644 INFO running `"docker" "start" "-a" "750748d15f4fe06c90f90f75a161625d53730c7a0584489d43b615a5d9f160ad"`
Dec 18 02:39:31.683 INFO [stderr]    Compiling serde_derive_internals v0.20.0
Dec 18 02:39:34.610 INFO [stderr]    Compiling serde_derive v1.0.29
Dec 18 02:39:40.640 INFO [stderr]     Checking docopt v0.8.3
Dec 18 02:39:41.639 INFO [stderr]     Checking morse v0.1.0 (/opt/crater/workdir)
Dec 18 02:39:44.705 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.14s
Dec 18 02:39:45.886 INFO running `"docker" "inspect" "750748d15f4fe06c90f90f75a161625d53730c7a0584489d43b615a5d9f160ad"`
Dec 18 02:39:46.226 INFO running `"docker" "rm" "-f" "750748d15f4fe06c90f90f75a161625d53730c7a0584489d43b615a5d9f160ad"`
Dec 18 02:39:46.568 INFO [stdout] 750748d15f4fe06c90f90f75a161625d53730c7a0584489d43b615a5d9f160ad