Dec 18 06:36:29.184 INFO checking Mancomb/four_in_a_row against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 06:36:29.184 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-4/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/Mancomb/four_in_a_row:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 06:36:29.472 INFO [stdout] d5279acdfa2ecf02512c10b72cc25aa3ceb87592b038bbbf9ac3ec74eafbd791
Dec 18 06:36:29.474 INFO running `"docker" "start" "-a" "d5279acdfa2ecf02512c10b72cc25aa3ceb87592b038bbbf9ac3ec74eafbd791"`
Dec 18 06:36:30.308 INFO [stderr]     Checking mcts v0.2.0
Dec 18 06:36:31.004 INFO [stderr]     Checking four_in_a_row v0.1.0 (/opt/crater/workdir)
Dec 18 06:36:31.280 INFO [stderr] warning: unused import: `random::Random`
Dec 18 06:36:31.280 INFO [stderr]   --> src/main.rs:12:5
Dec 18 06:36:31.280 INFO [stderr]    |
Dec 18 06:36:31.280 INFO [stderr] 12 | use random::Random;
Dec 18 06:36:31.280 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 18 06:36:31.280 INFO [stderr]    |
Dec 18 06:36:31.280 INFO [stderr]    = note: #[warn(unused_imports)] on by default
Dec 18 06:36:31.280 INFO [stderr] 
Dec 18 06:36:31.300 INFO [stderr] warning: unused import: `random::Random`
Dec 18 06:36:31.300 INFO [stderr]   --> src/main.rs:12:5
Dec 18 06:36:31.300 INFO [stderr]    |
Dec 18 06:36:31.300 INFO [stderr] 12 | use random::Random;
Dec 18 06:36:31.300 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 18 06:36:31.300 INFO [stderr]    |
Dec 18 06:36:31.300 INFO [stderr]    = note: #[warn(unused_imports)] on by default
Dec 18 06:36:31.300 INFO [stderr] 
Dec 18 06:36:31.446 INFO [stderr] warning: struct is never constructed: `Random`
Dec 18 06:36:31.446 INFO [stderr]  --> src/random.rs:8:1
Dec 18 06:36:31.446 INFO [stderr]   |
Dec 18 06:36:31.446 INFO [stderr] 8 | pub struct Random;
Dec 18 06:36:31.446 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 18 06:36:31.446 INFO [stderr]   |
Dec 18 06:36:31.446 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 18 06:36:31.447 INFO [stderr] 
Dec 18 06:36:31.448 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 06:36:31.448 INFO [stderr]   --> src/connect_four.rs:56:17
Dec 18 06:36:31.448 INFO [stderr]    |
Dec 18 06:36:31.448 INFO [stderr] 56 |                 write!(out, "|{}", c);
Dec 18 06:36:31.448 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^
Dec 18 06:36:31.450 INFO [stderr]    |
Dec 18 06:36:31.450 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 06:36:31.450 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 06:36:31.450 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 18 06:36:31.450 INFO [stderr] 
Dec 18 06:36:31.450 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 06:36:31.450 INFO [stderr]   --> src/connect_four.rs:58:13
Dec 18 06:36:31.450 INFO [stderr]    |
Dec 18 06:36:31.450 INFO [stderr] 58 |             writeln!(out, "|");
Dec 18 06:36:31.450 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^
Dec 18 06:36:31.450 INFO [stderr]    |
Dec 18 06:36:31.450 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 06:36:31.450 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 18 06:36:31.450 INFO [stderr] 
Dec 18 06:36:31.450 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 06:36:31.450 INFO [stderr]   --> src/connect_four.rs:60:9
Dec 18 06:36:31.450 INFO [stderr]    |
Dec 18 06:36:31.450 INFO [stderr] 60 |         writeln!(out, "---------------\n 0 1 2 3 4 5 6");
Dec 18 06:36:31.450 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 06:36:31.450 INFO [stderr]    |
Dec 18 06:36:31.450 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 06:36:31.450 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 18 06:36:31.451 INFO [stderr] 
Dec 18 06:36:31.506 INFO [stderr] warning: struct is never constructed: `Random`
Dec 18 06:36:31.506 INFO [stderr]  --> src/random.rs:8:1
Dec 18 06:36:31.506 INFO [stderr]   |
Dec 18 06:36:31.506 INFO [stderr] 8 | pub struct Random;
Dec 18 06:36:31.506 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 18 06:36:31.506 INFO [stderr]   |
Dec 18 06:36:31.506 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 18 06:36:31.506 INFO [stderr] 
Dec 18 06:36:31.507 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 06:36:31.507 INFO [stderr]   --> src/connect_four.rs:56:17
Dec 18 06:36:31.507 INFO [stderr]    |
Dec 18 06:36:31.507 INFO [stderr] 56 |                 write!(out, "|{}", c);
Dec 18 06:36:31.507 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^
Dec 18 06:36:31.507 INFO [stderr]    |
Dec 18 06:36:31.507 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 06:36:31.507 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 06:36:31.507 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 18 06:36:31.507 INFO [stderr] 
Dec 18 06:36:31.507 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 06:36:31.507 INFO [stderr]   --> src/connect_four.rs:58:13
Dec 18 06:36:31.507 INFO [stderr]    |
Dec 18 06:36:31.507 INFO [stderr] 58 |             writeln!(out, "|");
Dec 18 06:36:31.507 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^
Dec 18 06:36:31.507 INFO [stderr]    |
Dec 18 06:36:31.507 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 06:36:31.507 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 18 06:36:31.507 INFO [stderr] 
Dec 18 06:36:31.507 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 06:36:31.507 INFO [stderr]   --> src/connect_four.rs:60:9
Dec 18 06:36:31.507 INFO [stderr]    |
Dec 18 06:36:31.507 INFO [stderr] 60 |         writeln!(out, "---------------\n 0 1 2 3 4 5 6");
Dec 18 06:36:31.507 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 06:36:31.507 INFO [stderr]    |
Dec 18 06:36:31.507 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 06:36:31.507 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 18 06:36:31.507 INFO [stderr] 
Dec 18 06:36:31.527 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.26s
Dec 18 06:36:32.167 INFO running `"docker" "inspect" "d5279acdfa2ecf02512c10b72cc25aa3ceb87592b038bbbf9ac3ec74eafbd791"`
Dec 18 06:36:32.490 INFO running `"docker" "rm" "-f" "d5279acdfa2ecf02512c10b72cc25aa3ceb87592b038bbbf9ac3ec74eafbd791"`
Dec 18 06:36:32.842 INFO [stdout] d5279acdfa2ecf02512c10b72cc25aa3ceb87592b038bbbf9ac3ec74eafbd791