Dec 12 12:53:35.865 INFO checking immutable-0.1.1 against try#aa9aa79c3c583aab59ac9134542d60a780c35e2e for pr-56677
Dec 12 12:53:35.866 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-7/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-7/pr-56677/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/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 +aa9aa79c3c583aab59ac9134542d60a780c35e2e-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 12:53:36.037 INFO [stdout] e3207f9fe7d12dfaf3d6bcf08d5acbe80864072d73e438537e80b0141288c174
Dec 12 12:53:36.038 INFO running `"docker" "start" "-a" "e3207f9fe7d12dfaf3d6bcf08d5acbe80864072d73e438537e80b0141288c174"`
Dec 12 12:53:36.629 INFO [stderr] usermod: no changes
Dec 12 12:53:36.662 INFO [stderr]     Checking immutable v0.1.1 (/source)
Dec 12 12:53:37.304 INFO [stderr] warning: unused import: `std::vec::IntoIter`
Dec 12 12:53:37.304 INFO [stderr]  --> src/list.rs:7:5
Dec 12 12:53:37.304 INFO [stderr]   |
Dec 12 12:53:37.304 INFO [stderr] 7 | use std::vec::IntoIter;
Dec 12 12:53:37.304 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 12 12:53:37.304 INFO [stderr]   |
Dec 12 12:53:37.304 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 12 12:53:37.304 INFO [stderr] 
Dec 12 12:53:37.768 INFO [stderr] warning: unused attribute
Dec 12 12:53:37.768 INFO [stderr]  --> src/list.rs:9:1
Dec 12 12:53:37.768 INFO [stderr]   |
Dec 12 12:53:37.768 INFO [stderr] 9 | #[macro_escape]
Dec 12 12:53:37.768 INFO [stderr]   | ^^^^^^^^^^^^^^^
Dec 12 12:53:37.768 INFO [stderr]   |
Dec 12 12:53:37.768 INFO [stderr]   = note: #[warn(unused_attributes)] on by default
Dec 12 12:53:37.768 INFO [stderr] 
Dec 12 12:53:37.768 INFO [stderr] warning: unused attribute
Dec 12 12:53:37.768 INFO [stderr]   --> src/tree/binary_tree.rs:11:1
Dec 12 12:53:37.768 INFO [stderr]    |
Dec 12 12:53:37.768 INFO [stderr] 11 | #[macro_escape]
Dec 12 12:53:37.768 INFO [stderr]    | ^^^^^^^^^^^^^^^
Dec 12 12:53:37.768 INFO [stderr] 
Dec 12 12:53:37.904 INFO [stderr] warning: unused import: `std::vec::IntoIter`
Dec 12 12:53:37.904 INFO [stderr]  --> src/list.rs:7:5
Dec 12 12:53:37.904 INFO [stderr]   |
Dec 12 12:53:37.904 INFO [stderr] 7 | use std::vec::IntoIter;
Dec 12 12:53:37.904 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 12 12:53:37.904 INFO [stderr]   |
Dec 12 12:53:37.904 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 12 12:53:37.904 INFO [stderr] 
Dec 12 12:53:38.130 INFO [stderr] warning: unused attribute
Dec 12 12:53:38.130 INFO [stderr]  --> src/list.rs:9:1
Dec 12 12:53:38.130 INFO [stderr]   |
Dec 12 12:53:38.130 INFO [stderr] 9 | #[macro_escape]
Dec 12 12:53:38.130 INFO [stderr]   | ^^^^^^^^^^^^^^^
Dec 12 12:53:38.130 INFO [stderr]   |
Dec 12 12:53:38.130 INFO [stderr]   = note: #[warn(unused_attributes)] on by default
Dec 12 12:53:38.130 INFO [stderr] 
Dec 12 12:53:38.130 INFO [stderr] warning: unused attribute
Dec 12 12:53:38.130 INFO [stderr]   --> src/tree/binary_tree.rs:11:1
Dec 12 12:53:38.130 INFO [stderr]    |
Dec 12 12:53:38.130 INFO [stderr] 11 | #[macro_escape]
Dec 12 12:53:38.130 INFO [stderr]    | ^^^^^^^^^^^^^^^
Dec 12 12:53:38.130 INFO [stderr] 
Dec 12 12:53:38.179 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.53s
Dec 12 12:53:38.186 INFO [stderr] su: No module specific data is present
Dec 12 12:53:39.384 INFO running `"docker" "inspect" "e3207f9fe7d12dfaf3d6bcf08d5acbe80864072d73e438537e80b0141288c174"`
Dec 12 12:53:39.546 INFO running `"docker" "rm" "-f" "e3207f9fe7d12dfaf3d6bcf08d5acbe80864072d73e438537e80b0141288c174"`
Dec 12 12:53:39.692 INFO [stdout] e3207f9fe7d12dfaf3d6bcf08d5acbe80864072d73e438537e80b0141288c174