Dec 17 23:44:18.189 INFO checking giodamelio/little_boxes against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 17 23:44:18.189 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-6/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/giodamelio/little_boxes:/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 17 23:44:18.796 INFO [stdout] a6643d8bc8efec6a43e739e8118987ace9b0ccbfbf0909f8b95490e463621a22
Dec 17 23:44:18.798 INFO running `"docker" "start" "-a" "a6643d8bc8efec6a43e739e8118987ace9b0ccbfbf0909f8b95490e463621a22"`
Dec 17 23:44:20.390 INFO [stderr]     Checking serde v1.0.12
Dec 17 23:44:20.390 INFO [stderr]    Compiling serde_derive v1.0.12
Dec 17 23:44:31.424 INFO [stderr]     Checking docopt v0.8.1
Dec 17 23:44:32.719 INFO [stderr]     Checking little_boxes v1.6.0 (/opt/crater/workdir)
Dec 17 23:44:33.669 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.33s
Dec 17 23:44:34.360 INFO running `"docker" "inspect" "a6643d8bc8efec6a43e739e8118987ace9b0ccbfbf0909f8b95490e463621a22"`
Dec 17 23:44:34.588 INFO running `"docker" "rm" "-f" "a6643d8bc8efec6a43e739e8118987ace9b0ccbfbf0909f8b95490e463621a22"`
Dec 17 23:44:34.832 INFO [stdout] a6643d8bc8efec6a43e739e8118987ace9b0ccbfbf0909f8b95490e463621a22