Dec 12 01:37:58.709 INFO checking Mancomb/four_in_a_row against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 01:37:58.709 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-1/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/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 01:37:59.121 INFO [stdout] c4f23f00443ea54586d72d509713fab2e830ae4fe46046ae5cfa07c7ea571744
Dec 12 01:37:59.123 INFO running `"docker" "start" "-a" "c4f23f00443ea54586d72d509713fab2e830ae4fe46046ae5cfa07c7ea571744"`
Dec 12 01:38:00.576 INFO [stderr] usermod: no changes
Dec 12 01:38:00.724 INFO [stderr]     Checking mcts v0.2.0
Dec 12 01:38:01.812 INFO [stderr]     Checking four_in_a_row v0.1.0 (/source)
Dec 12 01:38:02.755 INFO [stderr] warning: unused import: `random::Random`
Dec 12 01:38:02.755 INFO [stderr]   --> src/main.rs:12:5
Dec 12 01:38:02.755 INFO [stderr]    |
Dec 12 01:38:02.755 INFO [stderr] 12 | use random::Random;
Dec 12 01:38:02.755 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 12 01:38:02.755 INFO [stderr]    |
Dec 12 01:38:02.755 INFO [stderr]    = note: #[warn(unused_imports)] on by default
Dec 12 01:38:02.755 INFO [stderr] 
Dec 12 01:38:02.865 INFO [stderr] warning: unused import: `random::Random`
Dec 12 01:38:02.865 INFO [stderr]   --> src/main.rs:12:5
Dec 12 01:38:02.865 INFO [stderr]    |
Dec 12 01:38:02.865 INFO [stderr] 12 | use random::Random;
Dec 12 01:38:02.865 INFO [stderr]    |     ^^^^^^^^^^^^^^
Dec 12 01:38:02.865 INFO [stderr]    |
Dec 12 01:38:02.865 INFO [stderr]    = note: #[warn(unused_imports)] on by default
Dec 12 01:38:02.865 INFO [stderr] 
Dec 12 01:38:02.870 INFO [stderr] warning: struct is never constructed: `Random`
Dec 12 01:38:02.870 INFO [stderr]  --> src/random.rs:8:1
Dec 12 01:38:02.870 INFO [stderr]   |
Dec 12 01:38:02.870 INFO [stderr] 8 | pub struct Random;
Dec 12 01:38:02.870 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 12 01:38:02.870 INFO [stderr]   |
Dec 12 01:38:02.870 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 12 01:38:02.870 INFO [stderr] 
Dec 12 01:38:02.870 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 01:38:02.870 INFO [stderr]   --> src/connect_four.rs:56:17
Dec 12 01:38:02.870 INFO [stderr]    |
Dec 12 01:38:02.870 INFO [stderr] 56 |                 write!(out, "|{}", c);
Dec 12 01:38:02.870 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^
Dec 12 01:38:02.870 INFO [stderr]    |
Dec 12 01:38:02.870 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 12 01:38:02.870 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 01:38:02.870 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 12 01:38:02.870 INFO [stderr] 
Dec 12 01:38:02.871 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 01:38:02.871 INFO [stderr]   --> src/connect_four.rs:58:13
Dec 12 01:38:02.871 INFO [stderr]    |
Dec 12 01:38:02.871 INFO [stderr] 58 |             writeln!(out, "|");
Dec 12 01:38:02.871 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^
Dec 12 01:38:02.871 INFO [stderr]    |
Dec 12 01:38:02.871 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 01:38:02.871 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 12 01:38:02.871 INFO [stderr] 
Dec 12 01:38:02.872 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 01:38:02.872 INFO [stderr]   --> src/connect_four.rs:60:9
Dec 12 01:38:02.872 INFO [stderr]    |
Dec 12 01:38:02.872 INFO [stderr] 60 |         writeln!(out, "---------------\n 0 1 2 3 4 5 6");
Dec 12 01:38:02.872 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 01:38:02.872 INFO [stderr]    |
Dec 12 01:38:02.872 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 01:38:02.872 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 12 01:38:02.872 INFO [stderr] 
Dec 12 01:38:03.004 INFO [stderr] warning: struct is never constructed: `Random`
Dec 12 01:38:03.004 INFO [stderr]  --> src/random.rs:8:1
Dec 12 01:38:03.004 INFO [stderr]   |
Dec 12 01:38:03.004 INFO [stderr] 8 | pub struct Random;
Dec 12 01:38:03.004 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^
Dec 12 01:38:03.004 INFO [stderr]   |
Dec 12 01:38:03.004 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 12 01:38:03.004 INFO [stderr] 
Dec 12 01:38:03.005 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 01:38:03.005 INFO [stderr]   --> src/connect_four.rs:56:17
Dec 12 01:38:03.005 INFO [stderr]    |
Dec 12 01:38:03.005 INFO [stderr] 56 |                 write!(out, "|{}", c);
Dec 12 01:38:03.005 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^
Dec 12 01:38:03.005 INFO [stderr]    |
Dec 12 01:38:03.005 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 12 01:38:03.005 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 01:38:03.005 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 12 01:38:03.005 INFO [stderr] 
Dec 12 01:38:03.006 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 01:38:03.006 INFO [stderr]   --> src/connect_four.rs:58:13
Dec 12 01:38:03.006 INFO [stderr]    |
Dec 12 01:38:03.006 INFO [stderr] 58 |             writeln!(out, "|");
Dec 12 01:38:03.006 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^
Dec 12 01:38:03.006 INFO [stderr]    |
Dec 12 01:38:03.006 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 01:38:03.006 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 12 01:38:03.006 INFO [stderr] 
Dec 12 01:38:03.006 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 01:38:03.006 INFO [stderr]   --> src/connect_four.rs:60:9
Dec 12 01:38:03.006 INFO [stderr]    |
Dec 12 01:38:03.006 INFO [stderr] 60 |         writeln!(out, "---------------\n 0 1 2 3 4 5 6");
Dec 12 01:38:03.006 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 01:38:03.006 INFO [stderr]    |
Dec 12 01:38:03.006 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 01:38:03.006 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 12 01:38:03.006 INFO [stderr] 
Dec 12 01:38:03.019 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.42s
Dec 12 01:38:03.023 INFO [stderr] su: No module specific data is present
Dec 12 01:38:03.258 INFO running `"docker" "inspect" "c4f23f00443ea54586d72d509713fab2e830ae4fe46046ae5cfa07c7ea571744"`
Dec 12 01:38:03.436 INFO running `"docker" "rm" "-f" "c4f23f00443ea54586d72d509713fab2e830ae4fe46046ae5cfa07c7ea571744"`
Dec 12 01:38:03.673 INFO [stdout] c4f23f00443ea54586d72d509713fab2e830ae4fe46046ae5cfa07c7ea571744