Dec 19 19:34:51.834 INFO checking brianboyko/my-first-rust-program against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 19:34:51.834 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-5/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/brianboyko/my-first-rust-program:/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 19:34:52.002 INFO [stdout] 5c0868cdf733f5bf07b752924f0822b0373d3541911bc5ea79f33fccb18d058b
Dec 19 19:34:52.004 INFO running `"docker" "start" "-a" "5c0868cdf733f5bf07b752924f0822b0373d3541911bc5ea79f33fccb18d058b"`
Dec 19 19:34:52.636 INFO [stderr]    Compiling libc v0.2.44
Dec 19 19:34:54.054 INFO [stderr]     Checking rand v0.6.1
Dec 19 19:34:56.089 INFO [stderr]     Checking guessing_game v0.1.0 (/opt/crater/workdir)
Dec 19 19:34:56.641 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.05s
Dec 19 19:34:56.963 INFO running `"docker" "inspect" "5c0868cdf733f5bf07b752924f0822b0373d3541911bc5ea79f33fccb18d058b"`
Dec 19 19:34:57.083 INFO running `"docker" "rm" "-f" "5c0868cdf733f5bf07b752924f0822b0373d3541911bc5ea79f33fccb18d058b"`
Dec 19 19:34:57.200 INFO [stdout] 5c0868cdf733f5bf07b752924f0822b0373d3541911bc5ea79f33fccb18d058b