Dec 18 06:23:34.941 INFO checking MindFlavor/bpb against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 06:23:34.941 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-7/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/MindFlavor/bpb:/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 06:23:35.136 INFO [stdout] 4755b6df25803c5af64e22bc5478f8ff66b5398a2e81c2a9a1e53dc45d483bd4
Dec 18 06:23:35.139 INFO running `"docker" "start" "-a" "4755b6df25803c5af64e22bc5478f8ff66b5398a2e81c2a9a1e53dc45d483bd4"`
Dec 18 06:23:35.792 INFO [stderr]     Checking bpb v0.1.1 (/opt/crater/workdir)
Dec 18 06:23:36.646 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 18 06:23:36.646 INFO [stderr]   --> src/main.rs:62:9
Dec 18 06:23:36.646 INFO [stderr]    |
Dec 18 06:23:36.646 INFO [stderr] 62 | /         stc.fields
Dec 18 06:23:36.646 INFO [stderr] 63 | |             .iter()
Dec 18 06:23:36.646 INFO [stderr] 64 | |             .filter(|f| !f.optional)
Dec 18 06:23:36.646 INFO [stderr] 65 | |             .map(|bt| abt.push(bt.builder_type.clone().unwrap()))
Dec 18 06:23:36.646 INFO [stderr] 66 | |             .collect::<()>();
Dec 18 06:23:36.646 INFO [stderr]    | |_____________________________^
Dec 18 06:23:36.646 INFO [stderr]    |
Dec 18 06:23:36.646 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 06:23:36.646 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 18 06:23:36.646 INFO [stderr] 
Dec 18 06:23:36.676 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 18 06:23:36.676 INFO [stderr]   --> src/main.rs:62:9
Dec 18 06:23:36.676 INFO [stderr]    |
Dec 18 06:23:36.676 INFO [stderr] 62 | /         stc.fields
Dec 18 06:23:36.676 INFO [stderr] 63 | |             .iter()
Dec 18 06:23:36.676 INFO [stderr] 64 | |             .filter(|f| !f.optional)
Dec 18 06:23:36.676 INFO [stderr] 65 | |             .map(|bt| abt.push(bt.builder_type.clone().unwrap()))
Dec 18 06:23:36.676 INFO [stderr] 66 | |             .collect::<()>();
Dec 18 06:23:36.676 INFO [stderr]    | |_____________________________^
Dec 18 06:23:36.676 INFO [stderr]    |
Dec 18 06:23:36.676 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 06:23:36.676 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 18 06:23:36.676 INFO [stderr] 
Dec 18 06:23:36.699 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.95s
Dec 18 06:23:37.058 INFO running `"docker" "inspect" "4755b6df25803c5af64e22bc5478f8ff66b5398a2e81c2a9a1e53dc45d483bd4"`
Dec 18 06:23:37.262 INFO running `"docker" "rm" "-f" "4755b6df25803c5af64e22bc5478f8ff66b5398a2e81c2a9a1e53dc45d483bd4"`
Dec 18 06:23:37.429 INFO [stdout] 4755b6df25803c5af64e22bc5478f8ff66b5398a2e81c2a9a1e53dc45d483bd4