Dec 19 14:31:47.042 INFO checking kcexn/rust_vowel_counter against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 14:31:47.042 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-1/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/kcexn/rust_vowel_counter:/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 14:31:47.535 INFO [stdout] 974d83755ddafdc397ecfd9ec846d9445a3e962bbdb1781d0053f12f0e1d63a3
Dec 19 14:31:47.536 INFO running `"docker" "start" "-a" "974d83755ddafdc397ecfd9ec846d9445a3e962bbdb1781d0053f12f0e1d63a3"`
Dec 19 14:31:49.192 INFO [stderr]     Checking vowel_utils v0.1.0 (/opt/crater/workdir/vowel_utils)
Dec 19 14:31:49.524 INFO [stderr]     Checking vowel_counter v0.1.0 (/opt/crater/workdir)
Dec 19 14:31:49.922 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
Dec 19 14:31:50.595 INFO running `"docker" "inspect" "974d83755ddafdc397ecfd9ec846d9445a3e962bbdb1781d0053f12f0e1d63a3"`
Dec 19 14:31:50.838 INFO running `"docker" "rm" "-f" "974d83755ddafdc397ecfd9ec846d9445a3e962bbdb1781d0053f12f0e1d63a3"`
Dec 19 14:31:51.144 INFO [stdout] 974d83755ddafdc397ecfd9ec846d9445a3e962bbdb1781d0053f12f0e1d63a3