[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 1.90.0 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-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/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-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/rachelseng/rust_HeuristicGameTree on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 012fb13c672985df3d80dfe8ade09e4d9f48a5573276acf1760cdf1a3e58e222
[INFO] running `Command { std: "docker" "start" "-a" "012fb13c672985df3d80dfe8ade09e4d9f48a5573276acf1760cdf1a3e58e222", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "012fb13c672985df3d80dfe8ade09e4d9f48a5573276acf1760cdf1a3e58e222", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "012fb13c672985df3d80dfe8ade09e4d9f48a5573276acf1760cdf1a3e58e222", kill_on_drop: false }`
[INFO] [stdout] 012fb13c672985df3d80dfe8ade09e4d9f48a5573276acf1760cdf1a3e58e222
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ef0eb628f2ff48c9d190da950170bb6080b5742ed89cca4b8bda56fbf98a7dac
[INFO] running `Command { std: "docker" "start" "-a" "ef0eb628f2ff48c9d190da950170bb6080b5742ed89cca4b8bda56fbf98a7dac", 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)]` 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 0.74s
[INFO] running `Command { std: "docker" "inspect" "ef0eb628f2ff48c9d190da950170bb6080b5742ed89cca4b8bda56fbf98a7dac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef0eb628f2ff48c9d190da950170bb6080b5742ed89cca4b8bda56fbf98a7dac", kill_on_drop: false }`
[INFO] [stdout] ef0eb628f2ff48c9d190da950170bb6080b5742ed89cca4b8bda56fbf98a7dac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] be114da0b35a47595b4e3780a1d9337f353829b8021162b638f3c07f0686e969
[INFO] running `Command { std: "docker" "start" "-a" "be114da0b35a47595b4e3780a1d9337f353829b8021162b638f3c07f0686e969", 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)]` 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)]` 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 0.89s
[INFO] running `Command { std: "docker" "inspect" "be114da0b35a47595b4e3780a1d9337f353829b8021162b638f3c07f0686e969", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be114da0b35a47595b4e3780a1d9337f353829b8021162b638f3c07f0686e969", kill_on_drop: false }`
[INFO] [stdout] be114da0b35a47595b4e3780a1d9337f353829b8021162b638f3c07f0686e969
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "+1.90.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 01481398ae528e00d6d47eea5087f5ca0cab11677426df4d85323c8e7a634265
[INFO] running `Command { std: "docker" "start" "-a" "01481398ae528e00d6d47eea5087f5ca0cab11677426df4d85323c8e7a634265", 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)]` 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 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/heuristic_game_tree-c82f25d136cb0911)
[INFO] [stdout] 
[INFO] [stdout] running 37 tests
[INFO] [stdout] test checkers::check_tests::force_jump_test ... ok
[INFO] [stdout] test checkers::check_tests::jump_piece_test ... ok
[INFO] [stdout] test checkers::check_tests::heuristic_test ... ok
[INFO] [stdout] test checkers::check_tests::force_repeated_jump_test ... ok
[INFO] [stdout] test checkers::check_tests::move_piece_test ... ok
[INFO] [stdout] test checkers::check_tests::no_winner_test ... ok
[INFO] [stdout] test checkers::check_tests::print_board_test ... ok
[INFO] [stdout] test checkers::check_tests::make_kings_test ... ok
[INFO] [stdout] test connect4::con_tests::board_not_full2_test ... ok
[INFO] [stdout] test connect4::con_tests::board_not_full_test ... ok
[INFO] [stdout] test checkers::check_tests::valid_move_test ... ok
[INFO] [stdout] test connect4::con_tests::invalid_con_test ... ok
[INFO] [stdout] test connect4::con_tests::ldiag_test ... ok
[INFO] [stdout] test connect4::con_tests::print_piece_x_con_test ... ok
[INFO] [stdout] test connect4::con_tests::rdiag_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::win_vert_con_test ... ok
[INFO] [stdout] test connect4::con_tests::lose_con_test ... ok
[INFO] [stdout] test general_game::gen_game_tests::o_printcheck ... ok
[INFO] [stdout] test general_game::gen_game_tests::x_check ... ok
[INFO] [stdout] test general_game::gen_game_tests::x_printcheck ... ok
[INFO] [stdout] test connect4::con_tests::vert_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::board_not_full_test ... ok
[INFO] [stdout] test connect4::con_tests::win_horiz_con_test ... ok
[INFO] [stdout] test connect4::con_tests::horiz_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::invalid_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::board_not_full2_test ... ok
[INFO] [stdout] test connect4::con_tests::new_con_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::new_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::print_piece_empty_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::print_piece_o_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::store_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::valid_tic_test ... ok
[INFO] [stdout] test tictactoe::tic_tests::print_piece_x_tic_test ... ok
[INFO] [stdout] test connect4::con_tests::validrow_con_test ... ok
[INFO] [stdout] test checkers::check_tests::invalid_move_test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 37 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/heuristic_game_tree-03ed002bae47a9e4)
[INFO] [stdout] 
[INFO] [stdout] running 10 tests
[INFO] [stdout] test start_tests::choose_game_check ... ok
[INFO] [stdout] test start_tests::difficulty_basic_easy ... ok
[INFO] [stdout] test start_tests::difficulty_basic_hard ... ok
[INFO] [stdout] test start_tests::choose_game_con ... ok
[INFO] [stdout] test start_tests::difficulty_basic_med ... 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_capital ... ok
[INFO] [stdout] test start_tests::choose_game_tic ... ok
[INFO] [stdout] test start_tests::choose_game_check_cap ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests heuristic_game_tree
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/minimax.rs - minimax::minimax_search (line 28) ... ok
[INFO] [stdout] test src/general_game.rs - general_game::print_piece (line 61) ... ok
[INFO] [stdout] test src/general_game.rs - general_game::print_piece (line 52) ... ok
[INFO] [stdout] test src/lib.rs - HeuristicGameTree (line 21) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.96s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "01481398ae528e00d6d47eea5087f5ca0cab11677426df4d85323c8e7a634265", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01481398ae528e00d6d47eea5087f5ca0cab11677426df4d85323c8e7a634265", kill_on_drop: false }`
[INFO] [stdout] 01481398ae528e00d6d47eea5087f5ca0cab11677426df4d85323c8e7a634265
