Dec 05 16:15:01.100 INFO checking binary-tree-0.2.0 against try#1df97983eb2057dc6a8f7eb364e263b51ae23230 for pr-56481
Dec 05 16:15:01.100 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-4/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56481/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +1df97983eb2057dc6a8f7eb364e263b51ae23230-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 05 16:15:01.508 INFO [stdout] 66b1614f640adb7ce3ef0fae5e3793972c6348e61fa9446553779876bfd6dc92
Dec 05 16:15:01.510 INFO running `"docker" "start" "-a" "66b1614f640adb7ce3ef0fae5e3793972c6348e61fa9446553779876bfd6dc92"`
Dec 05 16:15:02.655 INFO [stderr] usermod: no changes
Dec 05 16:15:02.783 INFO [stderr]     Checking binary-tree v0.2.0 (/source)
Dec 05 16:15:05.247 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 05 16:15:05.247 INFO [stderr]   --> benches/from_iter.rs:16:9
Dec 05 16:15:05.248 INFO [stderr]    |
Dec 05 16:15:05.248 INFO [stderr] 16 |         (0..TOTAL).collect::<CountTree<_>>();
Dec 05 16:15:05.248 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 16:15:05.255 INFO [stderr]    |
Dec 05 16:15:05.255 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 16:15:05.255 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 05 16:15:05.255 INFO [stderr] 
Dec 05 16:15:05.255 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 05 16:15:05.255 INFO [stderr]   --> benches/from_iter.rs:23:9
Dec 05 16:15:05.255 INFO [stderr]    |
Dec 05 16:15:05.255 INFO [stderr] 23 |         (0..TOTAL).collect::<LinkedList<_>>();
Dec 05 16:15:05.255 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 16:15:05.255 INFO [stderr]    |
Dec 05 16:15:05.255 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 05 16:15:05.255 INFO [stderr] 
Dec 05 16:15:05.255 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 05 16:15:05.255 INFO [stderr]   --> benches/from_iter.rs:30:9
Dec 05 16:15:05.255 INFO [stderr]    |
Dec 05 16:15:05.255 INFO [stderr] 30 |         (0..TOTAL).collect::<Vec<_>>();
Dec 05 16:15:05.255 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 16:15:05.255 INFO [stderr]    |
Dec 05 16:15:05.255 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 05 16:15:05.255 INFO [stderr] 
Dec 05 16:15:05.795 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.10s
Dec 05 16:15:05.795 INFO [stderr] su: No module specific data is present
Dec 05 16:15:06.445 INFO running `"docker" "inspect" "66b1614f640adb7ce3ef0fae5e3793972c6348e61fa9446553779876bfd6dc92"`
Dec 05 16:15:06.609 INFO running `"docker" "rm" "-f" "66b1614f640adb7ce3ef0fae5e3793972c6348e61fa9446553779876bfd6dc92"`
Dec 05 16:15:06.777 INFO [stdout] 66b1614f640adb7ce3ef0fae5e3793972c6348e61fa9446553779876bfd6dc92