Dec 19 11:38:24.430 INFO checking ntdef/groupby against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 11:38:24.430 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-1/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/ntdef/groupby:/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 11:38:25.078 INFO [stdout] cc8c62329f70d4a821e59a1d84337c757bfb660cc40c063b400d0e297aad3c7a
Dec 19 11:38:25.080 INFO running `"docker" "start" "-a" "cc8c62329f70d4a821e59a1d84337c757bfb660cc40c063b400d0e297aad3c7a"`
Dec 19 11:38:27.508 INFO [stderr]     Checking threadpool v1.3.2
Dec 19 11:38:27.508 INFO [stderr]     Checking clap v2.19.2
Dec 19 11:38:32.186 INFO [stderr]     Checking groupby v0.1.0 (/opt/crater/workdir)
Dec 19 11:38:32.716 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.27s
Dec 19 11:38:33.539 INFO running `"docker" "inspect" "cc8c62329f70d4a821e59a1d84337c757bfb660cc40c063b400d0e297aad3c7a"`
Dec 19 11:38:33.910 INFO running `"docker" "rm" "-f" "cc8c62329f70d4a821e59a1d84337c757bfb660cc40c063b400d0e297aad3c7a"`
Dec 19 11:38:34.276 INFO [stdout] cc8c62329f70d4a821e59a1d84337c757bfb660cc40c063b400d0e297aad3c7a