Dec 05 01:21:17.120 INFO checking Mancomb/four_in_a_row against try#1df97983eb2057dc6a8f7eb364e263b51ae23230 for pr-56481
Dec 05 01:21:17.120 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-7/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-7/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 01:21:17.494 INFO [stdout] 159d936e444df7f8d9d2a0c57ef7ba2e39ec0d73c8a8a0b849d238a86c1a6b23
Dec 05 01:21:17.501 INFO running `"docker" "start" "-a" "159d936e444df7f8d9d2a0c57ef7ba2e39ec0d73c8a8a0b849d238a86c1a6b23"`
Dec 05 01:21:18.275 INFO [stderr] usermod: no changes
Dec 05 01:21:18.331 INFO [stderr]     Checking mcts v0.2.0
Dec 05 01:21:19.240 INFO [stderr]     Checking four_in_a_row v0.1.0 (/source)
Dec 05 01:21:20.319 INFO [stderr] warning: unused import: `random::Random`
Dec 05 01:21:20.319 INFO [stderr]   --> src/main.rs:12:5
Dec 05 01:21:20.319 INFO [stderr]    |
Dec 05 01:21:20.319 INFO [stderr] 12 | use random::Random;
Dec 05 01:21:20.319 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 05 01:21:20.319 INFO [stderr]    |
Dec 05 01:21:20.319 INFO [stderr]    = note: #[warn(unused_imports)] on by default
Dec 05 01:21:20.319 INFO [stderr] 
Dec 05 01:21:20.448 INFO [stderr] warning: unused import: `random::Random`
Dec 05 01:21:20.448 INFO [stderr]   --> src/main.rs:12:5
Dec 05 01:21:20.448 INFO [stderr]    |
Dec 05 01:21:20.448 INFO [stderr] 12 | use random::Random;
Dec 05 01:21:20.448 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 05 01:21:20.448 INFO [stderr]    |
Dec 05 01:21:20.448 INFO [stderr]    = note: #[warn(unused_imports)] on by default
Dec 05 01:21:20.448 INFO [stderr] 
Dec 05 01:21:20.474 INFO [stderr] warning: struct is never constructed: `Random`
Dec 05 01:21:20.474 INFO [stderr]  --> src/random.rs:8:1
Dec 05 01:21:20.474 INFO [stderr]   |
Dec 05 01:21:20.474 INFO [stderr] 8 | pub struct Random;
Dec 05 01:21:20.474 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.480 INFO [stderr]   |
Dec 05 01:21:20.480 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 05 01:21:20.480 INFO [stderr] 
Dec 05 01:21:20.480 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.480 INFO [stderr]   --> src/connect_four.rs:56:17
Dec 05 01:21:20.480 INFO [stderr]    |
Dec 05 01:21:20.480 INFO [stderr] 56 |                 write!(out, "|{}", c);
Dec 05 01:21:20.480 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.480 INFO [stderr]    |
Dec 05 01:21:20.480 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 01:21:20.480 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.480 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 01:21:20.480 INFO [stderr] 
Dec 05 01:21:20.480 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.480 INFO [stderr]   --> src/connect_four.rs:58:13
Dec 05 01:21:20.480 INFO [stderr]    |
Dec 05 01:21:20.480 INFO [stderr] 58 |             writeln!(out, "|");
Dec 05 01:21:20.480 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.480 INFO [stderr]    |
Dec 05 01:21:20.480 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.480 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 01:21:20.480 INFO [stderr] 
Dec 05 01:21:20.482 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.482 INFO [stderr]   --> src/connect_four.rs:60:9
Dec 05 01:21:20.482 INFO [stderr]    |
Dec 05 01:21:20.482 INFO [stderr] 60 |         writeln!(out, "---------------\n 0 1 2 3 4 5 6");
Dec 05 01:21:20.482 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.482 INFO [stderr]    |
Dec 05 01:21:20.482 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.482 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 01:21:20.482 INFO [stderr] 
Dec 05 01:21:20.621 INFO [stderr] warning: struct is never constructed: `Random`
Dec 05 01:21:20.621 INFO [stderr]  --> src/random.rs:8:1
Dec 05 01:21:20.622 INFO [stderr]   |
Dec 05 01:21:20.622 INFO [stderr] 8 | pub struct Random;
Dec 05 01:21:20.622 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.622 INFO [stderr]   |
Dec 05 01:21:20.623 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 05 01:21:20.623 INFO [stderr] 
Dec 05 01:21:20.626 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.626 INFO [stderr]   --> src/connect_four.rs:56:17
Dec 05 01:21:20.626 INFO [stderr]    |
Dec 05 01:21:20.626 INFO [stderr] 56 |                 write!(out, "|{}", c);
Dec 05 01:21:20.627 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.627 INFO [stderr]    |
Dec 05 01:21:20.627 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 01:21:20.627 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.628 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 01:21:20.628 INFO [stderr] 
Dec 05 01:21:20.628 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.628 INFO [stderr]   --> src/connect_four.rs:58:13
Dec 05 01:21:20.629 INFO [stderr]    |
Dec 05 01:21:20.629 INFO [stderr] 58 |             writeln!(out, "|");
Dec 05 01:21:20.629 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.629 INFO [stderr]    |
Dec 05 01:21:20.630 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.630 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 01:21:20.630 INFO [stderr] 
Dec 05 01:21:20.631 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 01:21:20.631 INFO [stderr]   --> src/connect_four.rs:60:9
Dec 05 01:21:20.631 INFO [stderr]    |
Dec 05 01:21:20.631 INFO [stderr] 60 |         writeln!(out, "---------------\n 0 1 2 3 4 5 6");
Dec 05 01:21:20.631 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 01:21:20.633 INFO [stderr]    |
Dec 05 01:21:20.633 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 01:21:20.633 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 01:21:20.633 INFO [stderr] 
Dec 05 01:21:20.668 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.37s
Dec 05 01:21:20.672 INFO [stderr] su: No module specific data is present
Dec 05 01:21:21.239 INFO running `"docker" "inspect" "159d936e444df7f8d9d2a0c57ef7ba2e39ec0d73c8a8a0b849d238a86c1a6b23"`
Dec 05 01:21:21.408 INFO running `"docker" "rm" "-f" "159d936e444df7f8d9d2a0c57ef7ba2e39ec0d73c8a8a0b849d238a86c1a6b23"`
Dec 05 01:21:21.639 INFO [stdout] 159d936e444df7f8d9d2a0c57ef7ba2e39ec0d73c8a8a0b849d238a86c1a6b23