[INFO] cloning repository https://github.com/rachelseng/rust_HeuristicGameTree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rachelseng/rust_HeuristicGameTree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frachelseng%2Frust_HeuristicGameTree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frachelseng%2Frust_HeuristicGameTree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 179d23549cb1ef90bf74401d4f2bd5512919e801
[INFO] testing rachelseng/rust_HeuristicGameTree against beta-2025-09-21 for beta-1.91-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frachelseng%2Frust_HeuristicGameTree" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/rachelseng/rust_HeuristicGameTree
[INFO] finished tweaking git repo https://github.com/rachelseng/rust_HeuristicGameTree
[INFO] tweaked toml for git repo https://github.com/rachelseng/rust_HeuristicGameTree written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/rachelseng/rust_HeuristicGameTree on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/rachelseng/rust_HeuristicGameTree 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" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d099de04e92c7af9a7933a048c762a9e7497b377fc947b6482301ae715e1574b
[INFO] running `Command { std: "docker" "start" "-a" "d099de04e92c7af9a7933a048c762a9e7497b377fc947b6482301ae715e1574b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d099de04e92c7af9a7933a048c762a9e7497b377fc947b6482301ae715e1574b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d099de04e92c7af9a7933a048c762a9e7497b377fc947b6482301ae715e1574b", kill_on_drop: false }`
[INFO] [stdout] d099de04e92c7af9a7933a048c762a9e7497b377fc947b6482301ae715e1574b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 292472414cd55a0c182c43cc8cd1e295a069a30e711694848182822b4962c198
[INFO] running `Command { std: "docker" "start" "-a" "292472414cd55a0c182c43cc8cd1e295a069a30e711694848182822b4962c198", kill_on_drop: false }`
[INFO] [stderr]    Compiling heuristic_game_tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/checkers.rs:304:37
[INFO] [stdout]     |
[INFO] [stdout] 304 |     fn possible_moves(&self) -> Box<Iterator<Item = (usize, usize, Option<usize>)> + '_> {
[INFO] [stdout]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 304 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = (usize, usize, Option<usize>)> + '_> {
[INFO] [stdout]     |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:61:37
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_>;
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_>;
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/connect4.rs:10:37
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tictactoe.rs:22:37
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `Command { std: "docker" "inspect" "292472414cd55a0c182c43cc8cd1e295a069a30e711694848182822b4962c198", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "292472414cd55a0c182c43cc8cd1e295a069a30e711694848182822b4962c198", kill_on_drop: false }`
[INFO] [stdout] 292472414cd55a0c182c43cc8cd1e295a069a30e711694848182822b4962c198
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4ace8002bc70d65604e0bb7b915769a0d6b8ae98e4be649cbe73cdf9c59fd6fd
[INFO] running `Command { std: "docker" "start" "-a" "4ace8002bc70d65604e0bb7b915769a0d6b8ae98e4be649cbe73cdf9c59fd6fd", kill_on_drop: false }`
[INFO] [stderr]    Compiling heuristic_game_tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/checkers.rs:304:37
[INFO] [stdout]     |
[INFO] [stdout] 304 |     fn possible_moves(&self) -> Box<Iterator<Item = (usize, usize, Option<usize>)> + '_> {
[INFO] [stdout]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 304 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = (usize, usize, Option<usize>)> + '_> {
[INFO] [stdout]     |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:61:37
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_>;
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_>;
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/connect4.rs:10:37
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tictactoe.rs:22:37
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/checkers.rs:304:37
[INFO] [stdout]     |
[INFO] [stdout] 304 |     fn possible_moves(&self) -> Box<Iterator<Item = (usize, usize, Option<usize>)> + '_> {
[INFO] [stdout]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 304 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = (usize, usize, Option<usize>)> + '_> {
[INFO] [stdout]     |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:61:37
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_>;
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_>;
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/connect4.rs:10:37
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/tictactoe.rs:22:37
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.71s
[INFO] running `Command { std: "docker" "inspect" "4ace8002bc70d65604e0bb7b915769a0d6b8ae98e4be649cbe73cdf9c59fd6fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ace8002bc70d65604e0bb7b915769a0d6b8ae98e4be649cbe73cdf9c59fd6fd", kill_on_drop: false }`
[INFO] [stdout] 4ace8002bc70d65604e0bb7b915769a0d6b8ae98e4be649cbe73cdf9c59fd6fd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 1f50e8cdaf52e3d68cd685a695d0f7604fd85767ce1ad18f0af6c9bf36cafae7
[INFO] running `Command { std: "docker" "start" "-a" "1f50e8cdaf52e3d68cd685a695d0f7604fd85767ce1ad18f0af6c9bf36cafae7", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/checkers.rs:304:37
[INFO] [stderr]     |
[INFO] [stderr] 304 |     fn possible_moves(&self) -> Box<Iterator<Item = (usize, usize, Option<usize>)> + '_> {
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 304 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = (usize, usize, Option<usize>)> + '_> {
[INFO] [stderr]     |                                     +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:61:37
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_>;
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 61 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_>;
[INFO] [stderr]    |                                     +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/connect4.rs:10:37
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_> {
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_> {
[INFO] [stderr]    |                                     +++
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/tictactoe.rs:22:37
[INFO] [stderr]    |
[INFO] [stderr] 22 |     fn possible_moves(&self) -> Box<Iterator<Item = Self::Move> + '_> {
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 22 |     fn possible_moves(&self) -> Box<dyn Iterator<Item = Self::Move> + '_> {
[INFO] [stderr]    |                                     +++
[INFO] [stderr] 
[INFO] [stderr] warning: `heuristic_game_tree` (lib) generated 4 warnings (run `cargo fix --lib -p heuristic_game_tree` to apply 4 suggestions)
[INFO] [stderr] warning: `heuristic_game_tree` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/heuristic_game_tree-edeb215fa3c62627)
[INFO] [stdout] 
[INFO] [stdout] running 37 tests
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/heuristic_game_tree-1b337fc2a10f1da4)
[INFO] [stdout] test checkers::check_tests::make_kings_test ... ok
[INFO] [stdout] test checkers::check_tests::no_winner_test ... ok
[INFO] [stdout] test checkers::check_tests::force_repeated_jump_test ... ok
[INFO] [stdout] test checkers::check_tests::heuristic_test ... ok
[INFO] [stdout] test checkers::check_tests::move_piece_test ... ok
[INFO] [stdout] test checkers::check_tests::invalid_move_test ... ok
[INFO] [stdout] test checkers::check_tests::print_board_test ... ok
[INFO] [stdout] test connect4::con_tests::board_not_full_test ... ok
[INFO] [stdout] test connect4::con_tests::board_not_full2_test ... ok
[INFO] [stdout] test connect4::con_tests::horiz_test ... ok
[INFO] [stdout] test checkers::check_tests::valid_move_test ... ok
[INFO] [stdout] test connect4::con_tests::lose_con_test ... ok
[INFO] [stdout] test connect4::con_tests::new_con_test ... ok
[INFO] [stdout] test checkers::check_tests::force_jump_test ... ok
[INFO] [stdout] test connect4::con_tests::store_con_test ... ok
[INFO] [stdout] test connect4::con_tests::valid_con_test ... ok
[INFO] [stdout] test connect4::con_tests::rdiag_test ... ok
[INFO] [stdout] test connect4::con_tests::win_horiz_con_test ... ok
[INFO] [stdout] test connect4::con_tests::win_vert_con_test ... ok
[INFO] [stdout] test general_game::gen_game_tests::x_check ... ok
[INFO] [stdout] test general_game::gen_game_tests::o_printcheck ... ok
[INFO] [stdout] test tictactoe::tic_tests::board_not_full2_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::board_not_full_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::new_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::invalid_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::print_piece_o_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::print_piece_empty_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::store_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::print_piece_x_tic_test ... ok
[INFO] [stdout] test connect4::con_tests::invalid_con_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::valid_tic_test ... ok
[INFO] [stdout] test connect4::con_tests::ldiag_test ... ok
[INFO] [stdout] test general_game::gen_game_tests::x_printcheck ... ok
[INFO] [stdout] test checkers::check_tests::jump_piece_test ... ok
[INFO] [stdout] test connect4::con_tests::print_piece_x_con_test ... ok
[INFO] [stdout] test connect4::con_tests::validrow_con_test ... ok
[INFO] [stdout] test connect4::con_tests::vert_test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 37 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 10 tests
[INFO] [stdout] test start_tests::choose_game_con ... ok
[INFO] [stdout] test start_tests::difficulty_basic_easy ... ok
[INFO] [stdout] test start_tests::choose_game_tic ... ok
[INFO] [stdout] test start_tests::difficulty_basic_hard ... ok
[INFO] [stdout] test start_tests::difficulty_basic_no_input ... ok
[INFO] [stdout] test start_tests::difficulty_basic_wrong_input ... ok
[INFO] [stdout] test start_tests::difficulty_basic_med ... ok
[INFO] [stdout] test start_tests::difficulty_capital ... ok
[INFO] [stdout] test start_tests::choose_game_check_cap ... ok
[INFO] [stderr]    Doc-tests heuristic_game_tree
[INFO] [stdout] test start_tests::choose_game_check ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/general_game.rs - general_game::print_piece (line 61) ... ok
[INFO] [stdout] test src/lib.rs - HeuristicGameTree (line 21) ... ok
[INFO] [stdout] test src/minimax.rs - minimax::minimax_search (line 28) ... ok
[INFO] [stdout] test src/general_game.rs - general_game::print_piece (line 52) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.69s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "1f50e8cdaf52e3d68cd685a695d0f7604fd85767ce1ad18f0af6c9bf36cafae7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f50e8cdaf52e3d68cd685a695d0f7604fd85767ce1ad18f0af6c9bf36cafae7", kill_on_drop: false }`
[INFO] [stdout] 1f50e8cdaf52e3d68cd685a695d0f7604fd85767ce1ad18f0af6c9bf36cafae7
