Dec 18 11:09:51.658 INFO checking slackrbot-0.1.0 against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 11:09:51.658 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-4/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/reg/slackrbot/0.1.0:/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 18 11:09:51.888 INFO [stdout] c57e45a70856f14934f39539b8ffff0e06e16e1b04470628b2f3613a7187440d
Dec 18 11:09:51.893 INFO running `"docker" "start" "-a" "c57e45a70856f14934f39539b8ffff0e06e16e1b04470628b2f3613a7187440d"`
Dec 18 11:09:52.815 INFO [stderr]     Checking slackrbot v0.1.0 (/opt/crater/workdir)
Dec 18 11:09:53.088 INFO [stderr] warning: unused import: `rustc_serialize::json`
Dec 18 11:09:53.088 INFO [stderr]  --> src/lib.rs:2:5
Dec 18 11:09:53.088 INFO [stderr]   |
Dec 18 11:09:53.088 INFO [stderr] 2 | use rustc_serialize::json;
Dec 18 11:09:53.088 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
Dec 18 11:09:53.088 INFO [stderr]   |
Dec 18 11:09:53.088 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 11:09:53.088 INFO [stderr] 
Dec 18 11:09:53.148 INFO [stderr] warning: unused import: `rustc_serialize::json`
Dec 18 11:09:53.148 INFO [stderr]  --> src/lib.rs:2:5
Dec 18 11:09:53.148 INFO [stderr]   |
Dec 18 11:09:53.148 INFO [stderr] 2 | use rustc_serialize::json;
Dec 18 11:09:53.148 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
Dec 18 11:09:53.148 INFO [stderr]   |
Dec 18 11:09:53.148 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 11:09:53.148 INFO [stderr] 
Dec 18 11:09:53.236 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.43s
Dec 18 11:09:54.006 INFO running `"docker" "inspect" "c57e45a70856f14934f39539b8ffff0e06e16e1b04470628b2f3613a7187440d"`
Dec 18 11:09:54.298 INFO running `"docker" "rm" "-f" "c57e45a70856f14934f39539b8ffff0e06e16e1b04470628b2f3613a7187440d"`
Dec 18 11:09:54.524 INFO [stdout] c57e45a70856f14934f39539b8ffff0e06e16e1b04470628b2f3613a7187440d