Dec 19 12:46:25.955 INFO checking mersinvald/example-tokio-cpupool against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 12:46:25.955 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-1/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/mersinvald/example-tokio-cpupool:/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" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 12:46:26.508 INFO [stdout] f29ac3413c32389dd808a09b8d4732c5e8d146180c2c2cb1e84e6e9edb7f129d
Dec 19 12:46:26.510 INFO running `"docker" "start" "-a" "f29ac3413c32389dd808a09b8d4732c5e8d146180c2c2cb1e84e6e9edb7f129d"`
Dec 19 12:46:27.277 INFO [stderr]     Checking mio v0.6.10
Dec 19 12:46:27.277 INFO [stderr]     Checking tokio-io v0.1.3
Dec 19 12:46:28.440 INFO [stderr]     Checking tokio-core v0.1.9
Dec 19 12:46:29.460 INFO [stderr]     Checking arsen_cpupool v0.1.0 (/opt/crater/workdir)
Dec 19 12:46:30.108 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.88s
Dec 19 12:46:30.681 INFO running `"docker" "inspect" "f29ac3413c32389dd808a09b8d4732c5e8d146180c2c2cb1e84e6e9edb7f129d"`
Dec 19 12:46:30.960 INFO running `"docker" "rm" "-f" "f29ac3413c32389dd808a09b8d4732c5e8d146180c2c2cb1e84e6e9edb7f129d"`
Dec 19 12:46:31.266 INFO [stdout] f29ac3413c32389dd808a09b8d4732c5e8d146180c2c2cb1e84e6e9edb7f129d