[INFO] updating cached repository https://github.com/QuarkNerd/Rust_Noughts_-_Crosses
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] [stderr] From https://github.com/QuarkNerd/Rust_Noughts_-_Crosses
[INFO] [stderr]  + a4d872b...9ef7dd6 master     -> master  (forced update)
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9ef7dd6d72a688b1f2cf55f51424a4c074eb269e
[INFO] checking QuarkNerd/Rust_Noughts_-_Crosses against master#1557fb031b272b4c5bfcc7de5df7eddc7b36a584 for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQuarkNerd%2FRust_Noughts_-_Crosses" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/QuarkNerd/Rust_Noughts_-_Crosses on toolchain 1557fb031b272b4c5bfcc7de5df7eddc7b36a584
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/QuarkNerd/Rust_Noughts_-_Crosses
[INFO] finished tweaking git repo https://github.com/QuarkNerd/Rust_Noughts_-_Crosses
[INFO] tweaked toml for git repo https://github.com/QuarkNerd/Rust_Noughts_-_Crosses written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/QuarkNerd/Rust_Noughts_-_Crosses already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] be9643f90e7a5b420c0bf276d22ffb58e62a1acfcda484a8c62e9c543c4c56e7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "be9643f90e7a5b420c0bf276d22ffb58e62a1acfcda484a8c62e9c543c4c56e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be9643f90e7a5b420c0bf276d22ffb58e62a1acfcda484a8c62e9c543c4c56e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be9643f90e7a5b420c0bf276d22ffb58e62a1acfcda484a8c62e9c543c4c56e7", kill_on_drop: false }`
[INFO] [stdout] be9643f90e7a5b420c0bf276d22ffb58e62a1acfcda484a8c62e9c543c4c56e7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c2c699da0c99d198f2f54f476aaffe5645866101f7dd77a2c1c74a0f914b842d
[INFO] running `Command { std: "docker" "start" "-a" "c2c699da0c99d198f2f54f476aaffe5645866101f7dd77a2c1c74a0f914b842d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]    Compiling libc v0.2.70
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling serde v1.0.111
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]    Compiling quote v1.0.6
[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]    Compiling serde_derive v1.0.111
[INFO] [stderr]     Checking serde_json v1.0.53
[INFO] [stderr]     Checking tictactoe v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: constant is never used: `STRATEGY_FOLDER`
[INFO] [stdout]   --> src/players.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | const STRATEGY_FOLDER: &str  = r"player_strategy";
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_strategy_file_path`
[INFO] [stdout]   --> src/players.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn get_strategy_file_path(filename: &str) -> PathBuf {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ComputerLearner`
[INFO] [stdout]   --> src/players.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     ComputerLearner(ComputerLearner),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ComputerPlayer`
[INFO] [stdout]   --> src/players.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     ComputerPlayer(ComputerPlayer),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_highest_weighted_choice`
[INFO] [stdout]    --> src/players.rs:161:12
[INFO] [stdout]     |
[INFO] [stdout] 161 |     pub fn get_highest_weighted_choice(&self) -> String {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/players.rs:192:12
[INFO] [stdout]     |
[INFO] [stdout] 192 |     pub fn new(is_learning: bool) -> ComputerLearner {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `save`
[INFO] [stdout]    --> src/players.rs:200:12
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn save(&self, filename: &str) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `load`
[INFO] [stdout]    --> src/players.rs:206:12
[INFO] [stdout]     |
[INFO] [stdout] 206 |     pub fn load(filename: &str, is_learning: bool) -> ComputerLearner {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `load`
[INFO] [stdout]    --> src/players.rs:262:12
[INFO] [stdout]     |
[INFO] [stdout] 262 |     pub fn load(filename: &str) -> ComputerPlayer {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `key_value_mapper`
[INFO] [stdout]    --> src/players.rs:266:12
[INFO] [stdout]     |
[INFO] [stdout] 266 |         fn key_value_mapper(initial : (&String, &Strategy)) -> (String, String) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_user_selection`
[INFO] [stdout]   --> src/utilities.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn get_user_selection(options: &HashMap<&str, &str>) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `save_with_relative_path`
[INFO] [stdout]   --> src/utilities.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn save_with_relative_path(object: &impl Serialize, file: PathBuf) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `open_with_relative_path`
[INFO] [stdout]   --> src/utilities.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn open_with_relative_path<T>(file: PathBuf) -> T 
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `map_a_hash_map`
[INFO] [stdout]   --> src/utilities.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub fn map_a_hash_map<T,U, V, W>(original: &HashMap<T,U>, key_value_mapper: fn((&T,&U)) -> (V,W) ) -> HashMap<V,W> 
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utilities.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     file.write_all(string.as_bytes()); // as bytes converts it to byte array
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `STRATEGY_FOLDER`
[INFO] [stdout]   --> src/players.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | const STRATEGY_FOLDER: &str  = r"player_strategy";
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_strategy_file_path`
[INFO] [stdout]   --> src/players.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn get_strategy_file_path(filename: &str) -> PathBuf {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ComputerLearner`
[INFO] [stdout]   --> src/players.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     ComputerLearner(ComputerLearner),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ComputerPlayer`
[INFO] [stdout]   --> src/players.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     ComputerPlayer(ComputerPlayer),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_highest_weighted_choice`
[INFO] [stdout]    --> src/players.rs:161:12
[INFO] [stdout]     |
[INFO] [stdout] 161 |     pub fn get_highest_weighted_choice(&self) -> String {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/players.rs:192:12
[INFO] [stdout]     |
[INFO] [stdout] 192 |     pub fn new(is_learning: bool) -> ComputerLearner {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `save`
[INFO] [stdout]    --> src/players.rs:200:12
[INFO] [stdout]     |
[INFO] [stdout] 200 |     pub fn save(&self, filename: &str) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `load`
[INFO] [stdout]    --> src/players.rs:206:12
[INFO] [stdout]     |
[INFO] [stdout] 206 |     pub fn load(filename: &str, is_learning: bool) -> ComputerLearner {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `load`
[INFO] [stdout]    --> src/players.rs:262:12
[INFO] [stdout]     |
[INFO] [stdout] 262 |     pub fn load(filename: &str) -> ComputerPlayer {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `key_value_mapper`
[INFO] [stdout]    --> src/players.rs:266:12
[INFO] [stdout]     |
[INFO] [stdout] 266 |         fn key_value_mapper(initial : (&String, &Strategy)) -> (String, String) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_user_selection`
[INFO] [stdout]   --> src/utilities.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn get_user_selection(options: &HashMap<&str, &str>) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `save_with_relative_path`
[INFO] [stdout]   --> src/utilities.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn save_with_relative_path(object: &impl Serialize, file: PathBuf) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `open_with_relative_path`
[INFO] [stdout]   --> src/utilities.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn open_with_relative_path<T>(file: PathBuf) -> T 
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `map_a_hash_map`
[INFO] [stdout]   --> src/utilities.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 | pub fn map_a_hash_map<T,U, V, W>(original: &HashMap<T,U>, key_value_mapper: fn((&T,&U)) -> (V,W) ) -> HashMap<V,W> 
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/utilities.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     file.write_all(string.as_bytes()); // as bytes converts it to byte array
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 36.30s
[INFO] running `Command { std: "docker" "inspect" "c2c699da0c99d198f2f54f476aaffe5645866101f7dd77a2c1c74a0f914b842d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2c699da0c99d198f2f54f476aaffe5645866101f7dd77a2c1c74a0f914b842d", kill_on_drop: false }`
[INFO] [stdout] c2c699da0c99d198f2f54f476aaffe5645866101f7dd77a2c1c74a0f914b842d