Dec 17 18:33:47.967 INFO checking ntdef/groupby against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 17 18:33:47.968 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 18:33:48.395 INFO [stdout] fc6c24dac3175ece11693b3e88283e3cbcd3ec5b8344ecfbe6912a6758b83db5
Dec 17 18:33:48.397 INFO running `"docker" "start" "-a" "fc6c24dac3175ece11693b3e88283e3cbcd3ec5b8344ecfbe6912a6758b83db5"`
Dec 17 18:33:50.942 INFO [stderr]     Checking threadpool v1.3.2
Dec 17 18:33:50.948 INFO [stderr]     Checking clap v2.19.2
Dec 17 18:33:55.546 INFO [stderr]     Checking groupby v0.1.0 (/opt/crater/workdir)
Dec 17 18:33:56.275 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.40s
Dec 17 18:33:57.757 INFO running `"docker" "inspect" "fc6c24dac3175ece11693b3e88283e3cbcd3ec5b8344ecfbe6912a6758b83db5"`
Dec 17 18:33:57.998 INFO running `"docker" "rm" "-f" "fc6c24dac3175ece11693b3e88283e3cbcd3ec5b8344ecfbe6912a6758b83db5"`
Dec 17 18:33:58.336 INFO [stdout] fc6c24dac3175ece11693b3e88283e3cbcd3ec5b8344ecfbe6912a6758b83db5