Dec 19 15:11:22.717 INFO checking jimblandy/chat-mio against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 15:11:22.717 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/jimblandy/chat-mio:/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 15:11:23.238 INFO [stdout] 446d8323866dfbbd3aec0bd312ee6ea2ebf2fe5319527888fb432396ebb08777
Dec 19 15:11:23.240 INFO running `"docker" "start" "-a" "446d8323866dfbbd3aec0bd312ee6ea2ebf2fe5319527888fb432396ebb08777"`
Dec 19 15:11:26.124 INFO [stderr]     Checking net2 v0.2.26
Dec 19 15:11:26.128 INFO [stderr]     Checking nix v0.7.0
Dec 19 15:11:29.868 INFO [stderr]     Checking mio v0.6.1
Dec 19 15:11:31.104 INFO [stderr]     Checking chat-mio v0.1.0 (/opt/crater/workdir)
Dec 19 15:11:31.756 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.70s
Dec 19 15:11:32.810 INFO running `"docker" "inspect" "446d8323866dfbbd3aec0bd312ee6ea2ebf2fe5319527888fb432396ebb08777"`
Dec 19 15:11:33.116 INFO running `"docker" "rm" "-f" "446d8323866dfbbd3aec0bd312ee6ea2ebf2fe5319527888fb432396ebb08777"`
Dec 19 15:11:33.392 INFO [stdout] 446d8323866dfbbd3aec0bd312ee6ea2ebf2fe5319527888fb432396ebb08777