Dec 19 09:58:21.874 INFO checking ronniebnorth/rust_iron_playground against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 09:58:21.874 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/ronniebnorth/rust_iron_playground:/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 09:58:22.347 INFO [stdout] a62e1705687ace46d15ff379bb2b65af49ed2bf59b75c32f02acfcc7bf937dc0
Dec 19 09:58:22.349 INFO running `"docker" "start" "-a" "a62e1705687ace46d15ff379bb2b65af49ed2bf59b75c32f02acfcc7bf937dc0"`
Dec 19 09:58:24.881 INFO [stderr]     Checking hyper v0.10.13
Dec 19 09:58:28.700 INFO [stderr]     Checking iron v0.5.1
Dec 19 09:58:29.518 INFO [stderr]     Checking rust_iron_playground v0.1.0 (/opt/crater/workdir)
Dec 19 09:58:30.216 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.47s
Dec 19 09:58:32.702 INFO running `"docker" "inspect" "a62e1705687ace46d15ff379bb2b65af49ed2bf59b75c32f02acfcc7bf937dc0"`
Dec 19 09:58:33.017 INFO running `"docker" "rm" "-f" "a62e1705687ace46d15ff379bb2b65af49ed2bf59b75c32f02acfcc7bf937dc0"`
Dec 19 09:58:33.344 INFO [stdout] a62e1705687ace46d15ff379bb2b65af49ed2bf59b75c32f02acfcc7bf937dc0