Dec 19 19:12:34.393 INFO checking cesare/helixexp against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 19:12:34.393 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-2/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/cesare/helixexp:/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 19:12:34.759 INFO [stdout] 5fb1fb8d400295e0b19e08944e4da1a34cfff4ffb02c661d33ee2a16a7650e0c
Dec 19 19:12:34.785 INFO running `"docker" "start" "-a" "5fb1fb8d400295e0b19e08944e4da1a34cfff4ffb02c661d33ee2a16a7650e0c"`
Dec 19 19:12:36.322 INFO [stderr]    Compiling libcruby-sys v0.6.3
Dec 19 19:12:36.322 INFO [stderr]     Checking cslice v0.3.0
Dec 19 19:12:37.872 INFO [stderr]     Checking helix v0.6.3
Dec 19 19:12:38.248 INFO [stderr]     Checking helixexp v0.1.0 (/opt/crater/workdir)
Dec 19 19:12:38.836 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.56s
Dec 19 19:12:39.926 INFO running `"docker" "inspect" "5fb1fb8d400295e0b19e08944e4da1a34cfff4ffb02c661d33ee2a16a7650e0c"`
Dec 19 19:12:40.224 INFO running `"docker" "rm" "-f" "5fb1fb8d400295e0b19e08944e4da1a34cfff4ffb02c661d33ee2a16a7650e0c"`
Dec 19 19:12:40.564 INFO [stdout] 5fb1fb8d400295e0b19e08944e4da1a34cfff4ffb02c661d33ee2a16a7650e0c