Dec 19 21:34:22.890 INFO checking TropicSapling/rust-number-guesser against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 21:34:22.891 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-7/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/TropicSapling/rust-number-guesser:/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 21:34:23.308 INFO [stdout] 5b6a1e7a4021d81ca4f4329db99f9344100ff5259a9d2b7212b25ee5d3faa26e
Dec 19 21:34:23.312 INFO running `"docker" "start" "-a" "5b6a1e7a4021d81ca4f4329db99f9344100ff5259a9d2b7212b25ee5d3faa26e"`
Dec 19 21:34:24.948 INFO [stderr]     Checking rand_core v0.1.0-pre.0
Dec 19 21:34:25.386 INFO [stderr]     Checking rand v0.5.0-pre.0
Dec 19 21:34:27.524 INFO [stderr]     Checking rust-number-guesser v0.1.0 (/opt/crater/workdir)
Dec 19 21:34:28.228 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.33s
Dec 19 21:34:28.740 INFO running `"docker" "inspect" "5b6a1e7a4021d81ca4f4329db99f9344100ff5259a9d2b7212b25ee5d3faa26e"`
Dec 19 21:34:29.026 INFO running `"docker" "rm" "-f" "5b6a1e7a4021d81ca4f4329db99f9344100ff5259a9d2b7212b25ee5d3faa26e"`
Dec 19 21:34:29.372 INFO [stdout] 5b6a1e7a4021d81ca4f4329db99f9344100ff5259a9d2b7212b25ee5d3faa26e