[INFO] cloning repository https://github.com/steinsag/rust-connect4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/steinsag/rust-connect4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsteinsag%2Frust-connect4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsteinsag%2Frust-connect4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d9d3f098247097ab3f65e5006b1196bb331e82e7
[INFO] testing steinsag/rust-connect4 against try#0abe69e6c16114311cc2700e972492e64d69c28f for pr-154065-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsteinsag%2Frust-connect4" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/steinsag/rust-connect4
[INFO] finished tweaking git repo https://github.com/steinsag/rust-connect4
[INFO] tweaked toml for git repo https://github.com/steinsag/rust-connect4 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/steinsag/rust-connect4 on toolchain 0abe69e6c16114311cc2700e972492e64d69c28f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/steinsag/rust-connect4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a98fadfdc7dc996a0644a7c8cc382162cb59e0b7dfa300563f89510893d81aca
[INFO] running `Command { std: "docker" "start" "-a" "a98fadfdc7dc996a0644a7c8cc382162cb59e0b7dfa300563f89510893d81aca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a98fadfdc7dc996a0644a7c8cc382162cb59e0b7dfa300563f89510893d81aca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a98fadfdc7dc996a0644a7c8cc382162cb59e0b7dfa300563f89510893d81aca", kill_on_drop: false }`
[INFO] [stdout] a98fadfdc7dc996a0644a7c8cc382162cb59e0b7dfa300563f89510893d81aca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c305a1c1fcfe124bdce7d1863b309dfb290b21fc3f9f2dcf7df39377a8937489
[INFO] running `Command { std: "docker" "start" "-a" "c305a1c1fcfe124bdce7d1863b309dfb290b21fc3f9f2dcf7df39377a8937489", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling ppv-lite86 v0.2.9
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling connect4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/strategy/back_propagation.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut temporary_game_field = board.clone();
[INFO] [stdout]    |             ----^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `temporary_game_field`
[INFO] [stdout]   --> src/strategy/back_propagation.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut temporary_game_field = board.clone();
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_temporary_game_field`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/strategy/back_propagation.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         for col in 0..COLS {}
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `pushed_columns` is never read
[INFO] [stdout]  --> src/strategy/back_propagation.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct BackPropagationStrategy {
[INFO] [stdout]   |            ----------------------- field in this struct
[INFO] [stdout] 5 |     pushed_columns: Vec<u8>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/strategy/back_propagation.rs:18:45
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut temporary_game_field = board.clone();
[INFO] [stdout]    |                                             ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `Board` does not implement `Clone`, so calling `clone` on `&Board` copies the reference, which does not do anything and can be removed
[INFO] [stdout]    = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout] 18 -         let mut temporary_game_field = board.clone();
[INFO] [stdout] 18 +         let mut temporary_game_field = board;
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `Board`, implement `Clone` for it
[INFO] [stdout]   --> src/board.rs:22:1
[INFO] [stdout]    |
[INFO] [stdout] 22 + #[derive(Clone)]
[INFO] [stdout] 23 | pub struct Board {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.78s
[INFO] running `Command { std: "docker" "inspect" "c305a1c1fcfe124bdce7d1863b309dfb290b21fc3f9f2dcf7df39377a8937489", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c305a1c1fcfe124bdce7d1863b309dfb290b21fc3f9f2dcf7df39377a8937489", kill_on_drop: false }`
[INFO] [stdout] c305a1c1fcfe124bdce7d1863b309dfb290b21fc3f9f2dcf7df39377a8937489
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1b858006e71177740652ebd864eb80d87d09d39a5d5d3386f0b3db669992c369
[INFO] running `Command { std: "docker" "start" "-a" "1b858006e71177740652ebd864eb80d87d09d39a5d5d3386f0b3db669992c369", kill_on_drop: false }`
[INFO] [stderr]    Compiling connect4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/strategy/back_propagation.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut temporary_game_field = board.clone();
[INFO] [stdout]    |             ----^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `temporary_game_field`
[INFO] [stdout]   --> src/strategy/back_propagation.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut temporary_game_field = board.clone();
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_temporary_game_field`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `col`
[INFO] [stdout]   --> src/strategy/back_propagation.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         for col in 0..COLS {}
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `pushed_columns` is never read
[INFO] [stdout]  --> src/strategy/back_propagation.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct BackPropagationStrategy {
[INFO] [stdout]   |            ----------------------- field in this struct
[INFO] [stdout] 5 |     pushed_columns: Vec<u8>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/strategy/back_propagation.rs:18:45
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut temporary_game_field = board.clone();
[INFO] [stdout]    |                                             ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `Board` does not implement `Clone`, so calling `clone` on `&Board` copies the reference, which does not do anything and can be removed
[INFO] [stdout]    = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]    |
[INFO] [stdout] 18 -         let mut temporary_game_field = board.clone();
[INFO] [stdout] 18 +         let mut temporary_game_field = board;
[INFO] [stdout]    |
[INFO] [stdout] help: if you meant to clone `Board`, implement `Clone` for it
[INFO] [stdout]   --> src/board.rs:22:1
[INFO] [stdout]    |
[INFO] [stdout] 22 + #[derive(Clone)]
[INFO] [stdout] 23 | pub struct Board {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `Command { std: "docker" "inspect" "1b858006e71177740652ebd864eb80d87d09d39a5d5d3386f0b3db669992c369", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b858006e71177740652ebd864eb80d87d09d39a5d5d3386f0b3db669992c369", kill_on_drop: false }`
[INFO] [stdout] 1b858006e71177740652ebd864eb80d87d09d39a5d5d3386f0b3db669992c369
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] dcdd3fa0f49ce92d22d8a3e531e645bcc33a1a0fd5f0aca303b84fdc8c9d75d0
[INFO] running `Command { std: "docker" "start" "-a" "dcdd3fa0f49ce92d22d8a3e531e645bcc33a1a0fd5f0aca303b84fdc8c9d75d0", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/strategy/back_propagation.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let mut temporary_game_field = board.clone();
[INFO] [stderr]    |             ----^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `temporary_game_field`
[INFO] [stderr]   --> src/strategy/back_propagation.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let mut temporary_game_field = board.clone();
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_temporary_game_field`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `col`
[INFO] [stderr]   --> src/strategy/back_propagation.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |         for col in 0..COLS {}
[INFO] [stderr]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_col`
[INFO] [stderr] 
[INFO] [stderr] warning: field `pushed_columns` is never read
[INFO] [stderr]  --> src/strategy/back_propagation.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub struct BackPropagationStrategy {
[INFO] [stderr]   |            ----------------------- field in this struct
[INFO] [stderr] 5 |     pushed_columns: Vec<u8>,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stderr]   --> src/strategy/back_propagation.rs:18:45
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let mut temporary_game_field = board.clone();
[INFO] [stderr]    |                                             ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: the type `Board` does not implement `Clone`, so calling `clone` on `&Board` copies the reference, which does not do anything and can be removed
[INFO] [stderr]    = note: `#[warn(noop_method_call)]` on by default
[INFO] [stderr] help: remove this redundant call
[INFO] [stderr]    |
[INFO] [stderr] 18 -         let mut temporary_game_field = board.clone();
[INFO] [stderr] 18 +         let mut temporary_game_field = board;
[INFO] [stderr]    |
[INFO] [stderr] help: if you meant to clone `Board`, implement `Clone` for it
[INFO] [stderr]   --> src/board.rs:22:1
[INFO] [stderr]    |
[INFO] [stderr] 22 + #[derive(Clone)]
[INFO] [stderr] 23 | pub struct Board {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: `connect4` (bin "connect4" test) generated 5 warnings (run `cargo fix --bin "connect4" -p connect4 --tests` to apply 4 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/connect4-212b41516a120b0c)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test board::tests::test_find_lowest_empty_row ... ok
[INFO] [stdout] test board::tests::test_from ... ok
[INFO] [stdout] test board::tests::test_new ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "dcdd3fa0f49ce92d22d8a3e531e645bcc33a1a0fd5f0aca303b84fdc8c9d75d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dcdd3fa0f49ce92d22d8a3e531e645bcc33a1a0fd5f0aca303b84fdc8c9d75d0", kill_on_drop: false }`
[INFO] [stdout] dcdd3fa0f49ce92d22d8a3e531e645bcc33a1a0fd5f0aca303b84fdc8c9d75d0
