Dec 19 18:45:33.865 INFO checking cowang4/rusty_tree against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 18:45:33.865 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-3/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/cowang4/rusty_tree:/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 18:45:34.325 INFO [stdout] d35134bd7038d4327c97600041c0218b8f8d858ac16ae0642c18bbb10005f17f
Dec 19 18:45:34.328 INFO running `"docker" "start" "-a" "d35134bd7038d4327c97600041c0218b8f8d858ac16ae0642c18bbb10005f17f"`
Dec 19 18:45:36.028 INFO [stderr]    Compiling serde v1.0.57
Dec 19 18:45:36.036 INFO [stderr]    Compiling serde_derive v1.0.57
Dec 19 18:45:55.760 INFO [stderr]     Checking docopt v1.0.0
Dec 19 18:45:57.357 INFO [stderr]     Checking rusty_tree v0.1.0 (/opt/crater/workdir)
Dec 19 18:45:59.760 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.94s
Dec 19 18:46:00.646 INFO running `"docker" "inspect" "d35134bd7038d4327c97600041c0218b8f8d858ac16ae0642c18bbb10005f17f"`
Dec 19 18:46:00.894 INFO running `"docker" "rm" "-f" "d35134bd7038d4327c97600041c0218b8f8d858ac16ae0642c18bbb10005f17f"`
Dec 19 18:46:01.229 INFO [stdout] d35134bd7038d4327c97600041c0218b8f8d858ac16ae0642c18bbb10005f17f