Dec 19 10:31:22.502 INFO checking r2p2/snake against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 10:31:22.502 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-3/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/r2p2/snake:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 10:31:23.060 INFO [stdout] 36c8cb22e3fbc2c212362a47c4acb40fbc983f28c7999d35f75f22e1a0f086e3
Dec 19 10:31:23.062 INFO running `"docker" "start" "-a" "36c8cb22e3fbc2c212362a47c4acb40fbc983f28c7999d35f75f22e1a0f086e3"`
Dec 19 10:31:24.779 INFO [stderr]     Checking tempfile v2.2.0
Dec 19 10:31:25.174 INFO [stderr]     Checking gag v0.1.9
Dec 19 10:31:25.434 INFO [stderr]     Checking rustty v0.1.12
Dec 19 10:31:26.040 INFO [stderr]     Checking snake v0.1.0 (/opt/crater/workdir)
Dec 19 10:31:26.623 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.91s
Dec 19 10:31:27.314 INFO running `"docker" "inspect" "36c8cb22e3fbc2c212362a47c4acb40fbc983f28c7999d35f75f22e1a0f086e3"`
Dec 19 10:31:27.610 INFO running `"docker" "rm" "-f" "36c8cb22e3fbc2c212362a47c4acb40fbc983f28c7999d35f75f22e1a0f086e3"`
Dec 19 10:31:27.899 INFO [stdout] 36c8cb22e3fbc2c212362a47c4acb40fbc983f28c7999d35f75f22e1a0f086e3