Dec 17 15:08:20.597 INFO checking snoyberg/rush-crash-course-tokio-exercise-2 against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 17 15:08:20.597 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-2/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/snoyberg/rush-crash-course-tokio-exercise-2:/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 15:08:20.958 INFO [stdout] 827fe24017bfee1526b7fd71923e4fc7cb4ffaaece022e322724d9e32e252856
Dec 17 15:08:20.964 INFO running `"docker" "start" "-a" "827fe24017bfee1526b7fd71923e4fc7cb4ffaaece022e322724d9e32e252856"`
Dec 17 15:08:22.357 INFO [stderr]     Checking tokio-threadpool v0.1.9
Dec 17 15:08:23.612 INFO [stderr]     Checking tokio-fs v0.1.4
Dec 17 15:08:24.317 INFO [stderr]     Checking tokio v0.1.13
Dec 17 15:08:25.050 INFO [stderr]     Checking exercise2 v0.1.0 (/opt/crater/workdir)
Dec 17 15:08:25.640 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.44s
Dec 17 15:08:26.268 INFO running `"docker" "inspect" "827fe24017bfee1526b7fd71923e4fc7cb4ffaaece022e322724d9e32e252856"`
Dec 17 15:08:26.500 INFO running `"docker" "rm" "-f" "827fe24017bfee1526b7fd71923e4fc7cb4ffaaece022e322724d9e32e252856"`
Dec 17 15:08:26.804 INFO [stdout] 827fe24017bfee1526b7fd71923e4fc7cb4ffaaece022e322724d9e32e252856