Dec 05 01:21:17.596 INFO checking Mancomb/four_in_a_row against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 05 01:21:17.596 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-4/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56481/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/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 +c8ae2de8363be088604ffa2ccba84ff7ad7250bc-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 01:21:17.957 INFO [stdout] e63311bbd6795bae88c4d6ee285ed3f2f6970bd9a34c4b11f5488f5555e88ffc
Dec 05 01:21:17.959 INFO running `"docker" "start" "-a" "e63311bbd6795bae88c4d6ee285ed3f2f6970bd9a34c4b11f5488f5555e88ffc"`
Dec 05 01:21:18.586 INFO [stderr] usermod: no changes
Dec 05 01:21:18.646 INFO [stderr]     Checking mcts v0.2.0
Dec 05 01:21:19.632 INFO [stderr]     Checking four_in_a_row v0.1.0 (/source)
Dec 05 01:21:20.659 INFO [stderr] warning: unused import: `random::Random`
Dec 05 01:21:20.659 INFO [stderr]   --> src/main.rs:12:5
Dec 05 01:21:20.659 INFO [stderr]    |
Dec 05 01:21:20.659 INFO [stderr] 12 | use random::Random;
Dec 05 01:21:20.659 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 05 01:21:20.659 INFO [stderr]    |
Dec 05 01:21:20.659 INFO [stderr]    = note: #[warn(unused_imports)] on by default
Dec 05 01:21:20.660 INFO [stderr] 
Dec 05 01:21:20.799 INFO [stderr] warning: unused import: `random::Random`
Dec 05 01:21:20.799 INFO [stderr]   --> src/main.rs:12:5
Dec 05 01:21:20.799 INFO [stderr]    |
Dec 05 01:21:20.799 INFO [stderr] 12 | use random::Random;
Dec 05 01:21:20.799 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 05 01:21:20.799 INFO [stderr]    |
Dec 05 01:21:20.799 INFO [stderr]    = note: #[warn(unused_imports)] on by default
Dec 05 01:21:20.799 INFO [stderr] 
Dec 05 01:21:20.855 INFO [stderr] warning: struct is never constructed: `Random`
Dec 05 01:21:20.855 INFO [stderr]  --> src/random.rs:8:1
Dec 05 01:21:20.855 INFO [stderr]   |
Dec 05 01:21:20.855 INFO [stderr] 8 | pub struct Random;
Dec 05 01:21:20.855 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.855 INFO [stderr]   |
Dec 05 01:21:20.855 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 05 01:21:20.855 INFO [stderr] 
Dec 05 01:21:20.855 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.855 INFO [stderr]   --> src/connect_four.rs:56:17
Dec 05 01:21:20.855 INFO [stderr]    |
Dec 05 01:21:20.855 INFO [stderr] 56 |                 write!(out, "|{}", c);
Dec 05 01:21:20.855 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.855 INFO [stderr]    |
Dec 05 01:21:20.855 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 01:21:20.855 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.855 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 05 01:21:20.855 INFO [stderr] 
Dec 05 01:21:20.855 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.855 INFO [stderr]   --> src/connect_four.rs:58:13
Dec 05 01:21:20.855 INFO [stderr]    |
Dec 05 01:21:20.855 INFO [stderr] 58 |             writeln!(out, "|");
Dec 05 01:21:20.855 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.855 INFO [stderr]    |
Dec 05 01:21:20.855 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.855 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 05 01:21:20.855 INFO [stderr] 
Dec 05 01:21:20.855 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.855 INFO [stderr]   --> src/connect_four.rs:60:9
Dec 05 01:21:20.855 INFO [stderr]    |
Dec 05 01:21:20.855 INFO [stderr] 60 |         writeln!(out, "---------------\n 0 1 2 3 4 5 6");
Dec 05 01:21:20.855 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.855 INFO [stderr]    |
Dec 05 01:21:20.855 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.855 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 05 01:21:20.855 INFO [stderr] 
Dec 05 01:21:20.963 INFO [stderr] warning: struct is never constructed: `Random`
Dec 05 01:21:20.963 INFO [stderr]  --> src/random.rs:8:1
Dec 05 01:21:20.963 INFO [stderr]   |
Dec 05 01:21:20.963 INFO [stderr] 8 | pub struct Random;
Dec 05 01:21:20.963 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.963 INFO [stderr]   |
Dec 05 01:21:20.963 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 05 01:21:20.963 INFO [stderr] 
Dec 05 01:21:20.963 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.963 INFO [stderr]   --> src/connect_four.rs:56:17
Dec 05 01:21:20.963 INFO [stderr]    |
Dec 05 01:21:20.963 INFO [stderr] 56 |                 write!(out, "|{}", c);
Dec 05 01:21:20.963 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.963 INFO [stderr]    |
Dec 05 01:21:20.963 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 01:21:20.963 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.963 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 05 01:21:20.963 INFO [stderr] 
Dec 05 01:21:20.963 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.963 INFO [stderr]   --> src/connect_four.rs:58:13
Dec 05 01:21:20.963 INFO [stderr]    |
Dec 05 01:21:20.963 INFO [stderr] 58 |             writeln!(out, "|");
Dec 05 01:21:20.963 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.963 INFO [stderr]    |
Dec 05 01:21:20.963 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.963 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 05 01:21:20.963 INFO [stderr] 
Dec 05 01:21:20.963 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.963 INFO [stderr]   --> src/connect_four.rs:60:9
Dec 05 01:21:20.963 INFO [stderr]    |
Dec 05 01:21:20.963 INFO [stderr] 60 |         writeln!(out, "---------------\n 0 1 2 3 4 5 6");
Dec 05 01:21:20.963 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.963 INFO [stderr]    |
Dec 05 01:21:20.963 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.963 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 05 01:21:20.963 INFO [stderr] 
Dec 05 01:21:21.002 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.39s
Dec 05 01:21:21.002 INFO [stderr] su: No module specific data is present
Dec 05 01:21:21.581 INFO running `"docker" "inspect" "e63311bbd6795bae88c4d6ee285ed3f2f6970bd9a34c4b11f5488f5555e88ffc"`
Dec 05 01:21:21.805 INFO running `"docker" "rm" "-f" "e63311bbd6795bae88c4d6ee285ed3f2f6970bd9a34c4b11f5488f5555e88ffc"`
Dec 05 01:21:22.146 INFO [stdout] e63311bbd6795bae88c4d6ee285ed3f2f6970bd9a34c4b11f5488f5555e88ffc