Dec 18 18:12:41.811 INFO checking binary-tree-0.2.0 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 18:12:41.812 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-2/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/binary-tree/0.2.0:/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 18:12:42.053 INFO [stdout] ef55e8008a0332637380468f618f0ca397180a28a5fb479aeb2fc70a2e7c8556
Dec 18 18:12:42.053 INFO running `"docker" "start" "-a" "ef55e8008a0332637380468f618f0ca397180a28a5fb479aeb2fc70a2e7c8556"`
Dec 18 18:12:42.660 INFO [stderr]     Checking binary-tree v0.2.0 (/opt/crater/workdir)
Dec 18 18:12:44.457 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 18 18:12:44.457 INFO [stderr]   --> benches/from_iter.rs:16:9
Dec 18 18:12:44.457 INFO [stderr]    |
Dec 18 18:12:44.457 INFO [stderr] 16 |         (0..TOTAL).collect::<CountTree<_>>();
Dec 18 18:12:44.457 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:12:44.457 INFO [stderr]    |
Dec 18 18:12:44.457 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 18:12:44.457 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 18 18:12:44.457 INFO [stderr] 
Dec 18 18:12:44.457 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 18 18:12:44.457 INFO [stderr]   --> benches/from_iter.rs:23:9
Dec 18 18:12:44.457 INFO [stderr]    |
Dec 18 18:12:44.457 INFO [stderr] 23 |         (0..TOTAL).collect::<LinkedList<_>>();
Dec 18 18:12:44.457 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:12:44.457 INFO [stderr]    |
Dec 18 18:12:44.457 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 18 18:12:44.457 INFO [stderr] 
Dec 18 18:12:44.458 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 18 18:12:44.458 INFO [stderr]   --> benches/from_iter.rs:30:9
Dec 18 18:12:44.458 INFO [stderr]    |
Dec 18 18:12:44.458 INFO [stderr] 30 |         (0..TOTAL).collect::<Vec<_>>();
Dec 18 18:12:44.458 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:12:44.458 INFO [stderr]    |
Dec 18 18:12:44.458 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 18 18:12:44.458 INFO [stderr] 
Dec 18 18:12:44.577 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.96s
Dec 18 18:12:44.978 INFO running `"docker" "inspect" "ef55e8008a0332637380468f618f0ca397180a28a5fb479aeb2fc70a2e7c8556"`
Dec 18 18:12:45.062 INFO running `"docker" "rm" "-f" "ef55e8008a0332637380468f618f0ca397180a28a5fb479aeb2fc70a2e7c8556"`
Dec 18 18:12:45.170 INFO [stdout] ef55e8008a0332637380468f618f0ca397180a28a5fb479aeb2fc70a2e7c8556