Dec 12 17:38:51.713 INFO checking binary-tree-0.2.0 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 17:38:51.713 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-0/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/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 +3a75e80557a103497cffbcab395a2f37061a77ea-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 12 17:38:52.240 INFO [stdout] 4df3d3d672837382b0f39ccda1395410694e750e03b38a5e990983a7d869710c
Dec 12 17:38:52.242 INFO running `"docker" "start" "-a" "4df3d3d672837382b0f39ccda1395410694e750e03b38a5e990983a7d869710c"`
Dec 12 17:38:53.060 INFO [stderr] usermod: no changes
Dec 12 17:38:53.114 INFO [stderr]     Checking binary-tree v0.2.0 (/source)
Dec 12 17:38:55.800 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 12 17:38:55.800 INFO [stderr]   --> benches/from_iter.rs:16:9
Dec 12 17:38:55.800 INFO [stderr]    |
Dec 12 17:38:55.800 INFO [stderr] 16 |         (0..TOTAL).collect::<CountTree<_>>();
Dec 12 17:38:55.800 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 17:38:55.800 INFO [stderr]    |
Dec 12 17:38:55.800 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 12 17:38:55.800 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 12 17:38:55.800 INFO [stderr] 
Dec 12 17:38:55.800 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 12 17:38:55.800 INFO [stderr]   --> benches/from_iter.rs:23:9
Dec 12 17:38:55.800 INFO [stderr]    |
Dec 12 17:38:55.800 INFO [stderr] 23 |         (0..TOTAL).collect::<LinkedList<_>>();
Dec 12 17:38:55.800 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 17:38:55.800 INFO [stderr]    |
Dec 12 17:38:55.800 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 12 17:38:55.800 INFO [stderr] 
Dec 12 17:38:55.801 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 12 17:38:55.801 INFO [stderr]   --> benches/from_iter.rs:30:9
Dec 12 17:38:55.801 INFO [stderr]    |
Dec 12 17:38:55.801 INFO [stderr] 30 |         (0..TOTAL).collect::<Vec<_>>();
Dec 12 17:38:55.801 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 17:38:55.801 INFO [stderr]    |
Dec 12 17:38:55.801 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 12 17:38:55.801 INFO [stderr] 
Dec 12 17:38:55.862 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.79s
Dec 12 17:38:55.867 INFO [stderr] su: No module specific data is present
Dec 12 17:38:56.209 INFO running `"docker" "inspect" "4df3d3d672837382b0f39ccda1395410694e750e03b38a5e990983a7d869710c"`
Dec 12 17:38:56.309 INFO running `"docker" "rm" "-f" "4df3d3d672837382b0f39ccda1395410694e750e03b38a5e990983a7d869710c"`
Dec 12 17:38:56.397 INFO [stdout] 4df3d3d672837382b0f39ccda1395410694e750e03b38a5e990983a7d869710c