[INFO] cloning repository https://github.com/NickChubb/ReversiMCTS
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/NickChubb/ReversiMCTS" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNickChubb%2FReversiMCTS", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNickChubb%2FReversiMCTS'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b5b97f02148b27f86abe29ef2208ba68e003234e
[INFO] checking NickChubb/ReversiMCTS against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNickChubb%2FReversiMCTS" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/NickChubb/ReversiMCTS on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/NickChubb/ReversiMCTS
[INFO] finished tweaking git repo https://github.com/NickChubb/ReversiMCTS
[INFO] tweaked toml for git repo https://github.com/NickChubb/ReversiMCTS written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/NickChubb/ReversiMCTS 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded hashbrown v0.8.1
[INFO] [stderr]   Downloaded indexmap v1.5.0
[INFO] [stderr]   Downloaded libc v0.2.73
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7eb9b163e71d3076c5be641477687174f9fd1d5afe1ded55794682b7389fb61
[INFO] running `Command { std: "docker" "start" "-a" "a7eb9b163e71d3076c5be641477687174f9fd1d5afe1ded55794682b7389fb61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7eb9b163e71d3076c5be641477687174f9fd1d5afe1ded55794682b7389fb61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7eb9b163e71d3076c5be641477687174f9fd1d5afe1ded55794682b7389fb61", kill_on_drop: false }`
[INFO] [stdout] a7eb9b163e71d3076c5be641477687174f9fd1d5afe1ded55794682b7389fb61
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cd840ff5adb970cc7655ab1e29746609f8ac9a94dd6153a0d3c5cff70209911b
[INFO] running `Command { std: "docker" "start" "-a" "cd840ff5adb970cc7655ab1e29746609f8ac9a94dd6153a0d3c5cff70209911b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.73
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]    Compiling hashbrown v0.8.1
[INFO] [stderr]    Compiling indexmap v1.5.0
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking libmath v0.2.1
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking reversi v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `debug`
[INFO] [stdout]    --> src/main.rs:128:21
[INFO] [stdout]     |
[INFO] [stdout] 128 |     fn print(&self, debug: bool) {
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_debug`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:181:17
[INFO] [stdout]     |
[INFO] [stdout] 181 |         let mut u: u8 = 1;
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:320:17
[INFO] [stdout]     |
[INFO] [stdout] 320 |         let mut u: u8 = 1; // used as the iter for get_new_pos()
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `debug`
[INFO] [stdout]    --> src/main.rs:128:21
[INFO] [stdout]     |
[INFO] [stdout] 128 |     fn print(&self, debug: bool) {
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_debug`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prev_player_score`
[INFO] [stdout]    --> src/main.rs:841:10
[INFO] [stdout]     |
[INFO] [stdout] 841 |     let (prev_player_score, prev_cpu_score): (u8, u8) = b.get_score();
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `player_score`
[INFO] [stdout]    --> src/main.rs:857:14
[INFO] [stdout]     |
[INFO] [stdout] 857 |         let (player_score, cpu_score): (u8, u8) = new_board.get_score();
[INFO] [stdout]     |              ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difficulty`
[INFO] [stdout]    --> src/main.rs:886:13
[INFO] [stdout]     |
[INFO] [stdout] 886 |         let difficulty: String = match cpu_diff.trim().to_string().as_str() {
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difficulty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:181:17
[INFO] [stdout]     |
[INFO] [stdout] 181 |         let mut u: u8 = 1;
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:715:34
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); stdout().flush(); }
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); let _ = stdout().flush(); }
[INFO] [stdout]     |                                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:320:17
[INFO] [stdout]     |
[INFO] [stdout] 320 |         let mut u: u8 = 1; // used as the iter for get_new_pos()
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prev_player_score`
[INFO] [stdout]    --> src/main.rs:841:10
[INFO] [stdout]     |
[INFO] [stdout] 841 |     let (prev_player_score, prev_cpu_score): (u8, u8) = b.get_score();
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `player_score`
[INFO] [stdout]    --> src/main.rs:857:14
[INFO] [stdout]     |
[INFO] [stdout] 857 |         let (player_score, cpu_score): (u8, u8) = new_board.get_score();
[INFO] [stdout]     |              ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difficulty`
[INFO] [stdout]    --> src/main.rs:886:13
[INFO] [stdout]     |
[INFO] [stdout] 886 |         let difficulty: String = match cpu_diff.trim().to_string().as_str() {
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difficulty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:715:34
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); stdout().flush(); }
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); let _ = stdout().flush(); }
[INFO] [stdout]     |                                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.47s
[INFO] running `Command { std: "docker" "inspect" "cd840ff5adb970cc7655ab1e29746609f8ac9a94dd6153a0d3c5cff70209911b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd840ff5adb970cc7655ab1e29746609f8ac9a94dd6153a0d3c5cff70209911b", kill_on_drop: false }`
[INFO] [stdout] cd840ff5adb970cc7655ab1e29746609f8ac9a94dd6153a0d3c5cff70209911b
[INFO] checking NickChubb/ReversiMCTS against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNickChubb%2FReversiMCTS" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/NickChubb/ReversiMCTS on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/NickChubb/ReversiMCTS
[INFO] finished tweaking git repo https://github.com/NickChubb/ReversiMCTS
[INFO] tweaked toml for git repo https://github.com/NickChubb/ReversiMCTS written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/NickChubb/ReversiMCTS 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 587045f915b6e953f7e6e7cc4d0c0699cae6f6156b69cc61112e01642a3853d8
[INFO] running `Command { std: "docker" "start" "-a" "587045f915b6e953f7e6e7cc4d0c0699cae6f6156b69cc61112e01642a3853d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "587045f915b6e953f7e6e7cc4d0c0699cae6f6156b69cc61112e01642a3853d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "587045f915b6e953f7e6e7cc4d0c0699cae6f6156b69cc61112e01642a3853d8", kill_on_drop: false }`
[INFO] [stdout] 587045f915b6e953f7e6e7cc4d0c0699cae6f6156b69cc61112e01642a3853d8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c94817f0036055017bfc765d912cbffffcb7a82785a21394e2e724bb7d587e9
[INFO] running `Command { std: "docker" "start" "-a" "4c94817f0036055017bfc765d912cbffffcb7a82785a21394e2e724bb7d587e9", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.73
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling hashbrown v0.8.1
[INFO] [stderr]    Compiling indexmap v1.5.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking libmath v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking reversi v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `debug`
[INFO] [stdout]    --> src/main.rs:128:21
[INFO] [stdout]     |
[INFO] [stdout] 128 |     fn print(&self, debug: bool) {
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_debug`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:181:17
[INFO] [stdout]     |
[INFO] [stdout] 181 |         let mut u: u8 = 1;
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:320:17
[INFO] [stdout]     |
[INFO] [stdout] 320 |         let mut u: u8 = 1; // used as the iter for get_new_pos()
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `debug`
[INFO] [stdout]    --> src/main.rs:128:21
[INFO] [stdout]     |
[INFO] [stdout] 128 |     fn print(&self, debug: bool) {
[INFO] [stdout]     |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_debug`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:181:17
[INFO] [stdout]     |
[INFO] [stdout] 181 |         let mut u: u8 = 1;
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `u` is never read
[INFO] [stdout]    --> src/main.rs:320:17
[INFO] [stdout]     |
[INFO] [stdout] 320 |         let mut u: u8 = 1; // used as the iter for get_new_pos()
[INFO] [stdout]     |                 ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prev_player_score`
[INFO] [stdout]    --> src/main.rs:841:10
[INFO] [stdout]     |
[INFO] [stdout] 841 |     let (prev_player_score, prev_cpu_score): (u8, u8) = b.get_score();
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `player_score`
[INFO] [stdout]    --> src/main.rs:857:14
[INFO] [stdout]     |
[INFO] [stdout] 857 |         let (player_score, cpu_score): (u8, u8) = new_board.get_score();
[INFO] [stdout]     |              ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prev_player_score`
[INFO] [stdout]    --> src/main.rs:841:10
[INFO] [stdout]     |
[INFO] [stdout] 841 |     let (prev_player_score, prev_cpu_score): (u8, u8) = b.get_score();
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prev_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `player_score`
[INFO] [stdout]    --> src/main.rs:857:14
[INFO] [stdout]     |
[INFO] [stdout] 857 |         let (player_score, cpu_score): (u8, u8) = new_board.get_score();
[INFO] [stdout]     |              ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_player_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difficulty`
[INFO] [stdout]    --> src/main.rs:886:13
[INFO] [stdout]     |
[INFO] [stdout] 886 |         let difficulty: String = match cpu_diff.trim().to_string().as_str() {
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difficulty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difficulty`
[INFO] [stdout]    --> src/main.rs:886:13
[INFO] [stdout]     |
[INFO] [stdout] 886 |         let difficulty: String = match cpu_diff.trim().to_string().as_str() {
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difficulty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:715:34
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); stdout().flush(); }
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); let _ = stdout().flush(); }
[INFO] [stdout]     |                                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:715:34
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); stdout().flush(); }
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 715 |         if !debug { print!("."); let _ = stdout().flush(); }
[INFO] [stdout]     |                                  +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.23s
[INFO] running `Command { std: "docker" "inspect" "4c94817f0036055017bfc765d912cbffffcb7a82785a21394e2e724bb7d587e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c94817f0036055017bfc765d912cbffffcb7a82785a21394e2e724bb7d587e9", kill_on_drop: false }`
[INFO] [stdout] 4c94817f0036055017bfc765d912cbffffcb7a82785a21394e2e724bb7d587e9