[INFO] cloning repository https://github.com/endvvell/muz.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/endvvell/muz.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fendvvell%2Fmuz.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fendvvell%2Fmuz.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0dc8087ac402a65b45a8e3d6809495a95efd67e1
[INFO] checking endvvell/muz.rs against try#8a2f6fe57adadb246778b8d41925d3dc46d468cb for pr-158320
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fendvvell%2Fmuz.rs" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/endvvell/muz.rs
[INFO] finished tweaking git repo https://github.com/endvvell/muz.rs
[INFO] tweaked toml for git repo https://github.com/endvvell/muz.rs written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/endvvell/muz.rs on toolchain 8a2f6fe57adadb246778b8d41925d3dc46d468cb
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a2f6fe57adadb246778b8d41925d3dc46d468cb" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/endvvell/muz.rs 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" "+8a2f6fe57adadb246778b8d41925d3dc46d468cb" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking endvvell/muz.rs against try#8a2f6fe57adadb246778b8d41925d3dc46d468cb for pr-158320
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fendvvell%2Fmuz.rs" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/endvvell/muz.rs
[INFO] finished tweaking git repo https://github.com/endvvell/muz.rs
[INFO] tweaked toml for git repo https://github.com/endvvell/muz.rs written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/endvvell/muz.rs on toolchain 8a2f6fe57adadb246778b8d41925d3dc46d468cb
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a2f6fe57adadb246778b8d41925d3dc46d468cb" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/endvvell/muz.rs 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" "+8a2f6fe57adadb246778b8d41925d3dc46d468cb" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded clap v4.5.7
[INFO] [stderr]   Downloaded clap_derive v4.5.5
[INFO] [stderr]   Downloaded clap_builder v4.5.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 3ac4844c0109524be4eb4c24f942c77ef275246c867bbed28fcf60f0613991e6
[INFO] running `Command { std: "docker" "start" "3ac4844c0109524be4eb4c24f942c77ef275246c867bbed28fcf60f0613991e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "3ac4844c0109524be4eb4c24f942c77ef275246c867bbed28fcf60f0613991e6" "/opt/rustwide/cargo-home/bin/cargo" "+8a2f6fe57adadb246778b8d41925d3dc46d468cb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3ac4844c0109524be4eb4c24f942c77ef275246c867bbed28fcf60f0613991e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "3ac4844c0109524be4eb4c24f942c77ef275246c867bbed28fcf60f0613991e6" "/opt/rustwide/cargo-home/bin/cargo" "+8a2f6fe57adadb246778b8d41925d3dc46d468cb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]     Checking utf8parse v0.2.2
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking is_terminal_polyfill v1.70.0
[INFO] [stderr]     Checking memchr v2.7.2
[INFO] [stderr]     Checking colorchoice v1.0.1
[INFO] [stderr]     Checking anstyle v1.0.7
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[INFO] [stderr]     Checking equivalent v1.0.1
[INFO] [stderr]    Compiling syn v2.0.66
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[INFO] [stderr]     Checking anstream v0.6.14
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[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking regex-automata v0.4.7
[INFO] [stderr]    Compiling clap_derive v4.5.5
[INFO] [stderr]     Checking clap v4.5.7
[INFO] [stderr]     Checking regex v1.10.5
[INFO] [stderr]     Checking muz_rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `game_type_id` and `game_type_name` are never read
[INFO] [stdout]     --> src/main.rs:1206:5
[INFO] [stdout]      |
[INFO] [stdout] 1204 | struct GameType<'a> {
[INFO] [stdout]      |        -------- fields in this struct
[INFO] [stdout] 1205 |     // TODO: either remove these because they are not needed, or rewrite code so that it uses these fields
[INFO] [stdout] 1206 |     game_type_id: i32,
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout] 1207 |     game_type_name: &'a str,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `GameType` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]      = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `RED_WITH_UNDERLINE` is never used
[INFO] [stdout]  --> src/colours/colours.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub const RED_WITH_UNDERLINE: &str = "\x1B[4;31m";
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `GREEN_WITH_UNDERLINE` is never used
[INFO] [stdout]  --> src/colours/colours.rs:7:11
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub const GREEN_WITH_UNDERLINE: &str = "\x1B[4;32m";
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `YELLOW` is never used
[INFO] [stdout]  --> src/colours/colours.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub const YELLOW: &str = "\x1B[33m";
[INFO] [stdout]   |           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BLUE` is never used
[INFO] [stdout]   --> src/colours/colours.rs:13:11
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub const BLUE: &str = "\x1B[34m";
[INFO] [stdout]    |           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BLUE_WITH_UNDERLINE` is never used
[INFO] [stdout]   --> src/colours/colours.rs:15:11
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub const BLUE_WITH_UNDERLINE: &str = "\x1B[4;34m";
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:331:13
[INFO] [stdout]     |
[INFO] [stdout] 331 | /             writer_buf.write_all(
[INFO] [stdout] 332 | |                 format!(
[INFO] [stdout] 333 | |                     "\n\n{:>42}\n",
[INFO] [stdout] 334 | |                     YELLOW_WITH_UNDERLINE.to_owned()
[INFO] [stdout] ...   |
[INFO] [stdout] 338 | |                 .as_bytes(),
[INFO] [stdout] 339 | |             ); // TODO: error handling
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 331 |             let _ = writer_buf.write_all(
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:356:17
[INFO] [stdout]     |
[INFO] [stdout] 356 | /                 writer_buf.write_all(
[INFO] [stdout] 357 | |                     format!(
[INFO] [stdout] 358 | |                         "\n{:>width$} {} )\n",
[INFO] [stdout] 359 | |                         "(",
[INFO] [stdout] ...   |
[INFO] [stdout] 363 | |                     .as_bytes(),
[INFO] [stdout] 364 | |                 );
[INFO] [stdout]     | |_________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 356 |                 let _ = writer_buf.write_all(
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:384:17
[INFO] [stdout]     |
[INFO] [stdout] 384 | /                 writer_buf.write_all(
[INFO] [stdout] 385 | |                     format!(
[INFO] [stdout] 386 | |                         "  {:>width$}{}\n",
[INFO] [stdout] 387 | |                         "|",
[INFO] [stdout] ...   |
[INFO] [stdout] 391 | |                     .as_bytes(),
[INFO] [stdout] 392 | |                 );
[INFO] [stdout]     | |_________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 384 |                 let _ = writer_buf.write_all(
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:395:17
[INFO] [stdout]     |
[INFO] [stdout] 395 | /                 writer_buf.write_all(
[INFO] [stdout] 396 | |                     format!(
[INFO] [stdout] 397 | |                         "  {:<width$}|  {}\n",
[INFO] [stdout] 398 | |                         printable_answer[0],
[INFO] [stdout] ...   |
[INFO] [stdout] 402 | |                     .as_bytes(),
[INFO] [stdout] 403 | |                 );
[INFO] [stdout]     | |_________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 395 |                 let _ = writer_buf.write_all(
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:418:25
[INFO] [stdout]     |
[INFO] [stdout] 418 | /                         writer_buf.write_all(
[INFO] [stdout] 419 | |                             format!(
[INFO] [stdout] 420 | |                                 "  {:<width$}|  {}\n",
[INFO] [stdout] 421 | |                                 printable_answer[0],
[INFO] [stdout] ...   |
[INFO] [stdout] 425 | |                             .as_bytes(),
[INFO] [stdout] 426 | |                         );
[INFO] [stdout]     | |_________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 418 |                         let _ = writer_buf.write_all(
[INFO] [stdout]     |                         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:430:13
[INFO] [stdout]     |
[INFO] [stdout] 430 |             writer_buf.write_all("\n".as_bytes());
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 430 |             let _ = writer_buf.write_all("\n".as_bytes());
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `askForAnswer` should have a snake case name
[INFO] [stdout]    --> src/main.rs:434:8
[INFO] [stdout]     |
[INFO] [stdout] 434 |     fn askForAnswer(&self) -> Option<UserAnswer> {
[INFO] [stdout]     |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `ask_for_answer`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:437:13
[INFO] [stdout]     |
[INFO] [stdout] 437 |             io::stdout().flush(); // TODO: error handling
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 437 |             let _ = io::stdout().flush(); // TODO: error handling
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:445:13
[INFO] [stdout]     |
[INFO] [stdout] 445 |             io::stdout().flush(); // TODO: error handling
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 445 |             let _ = io::stdout().flush(); // TODO: error handling
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mut_askExercise` should have a snake case name
[INFO] [stdout]     --> src/main.rs:1040:8
[INFO] [stdout]      |
[INFO] [stdout] 1040 |     fn mut_askExercise(&mut self) -> i32 {
[INFO] [stdout]      |        ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `mut_ask_exercise`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1046:13
[INFO] [stdout]      |
[INFO] [stdout] 1046 |             io::stdout().flush(); // TODO: error handling
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1046 |             let _ = io::stdout().flush(); // TODO: error handling
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]     --> src/main.rs:1197:38
[INFO] [stdout]      |
[INFO] [stdout] 1197 | fn init_game_resources<'a>(cmd_args: &CommandArguments) -> (Game<'a>, Octave) {
[INFO] [stdout]      |                                      ^^^^^^^^^^^^^^^^^                ^^^^^^ the same lifetime is hidden here
[INFO] [stdout]      |                                      |
[INFO] [stdout]      |                                      the lifetime is elided here
[INFO] [stdout]      |
[INFO] [stdout]      = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]      = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]      |
[INFO] [stdout] 1197 | fn init_game_resources<'a>(cmd_args: &CommandArguments) -> (Game<'a>, Octave<'_>) {
[INFO] [stdout]      |                                                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1238:9
[INFO] [stdout]      |
[INFO] [stdout] 1238 |         io::stdout().flush(); // TODO: error handling
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1238 |         let _ = io::stdout().flush(); // TODO: error handling
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `game_type_id` and `game_type_name` are never read
[INFO] [stdout]     --> src/main.rs:1206:5
[INFO] [stdout]      |
[INFO] [stdout] 1204 | struct GameType<'a> {
[INFO] [stdout]      |        -------- fields in this struct
[INFO] [stdout] 1205 |     // TODO: either remove these because they are not needed, or rewrite code so that it uses these fields
[INFO] [stdout] 1206 |     game_type_id: i32,
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout] 1207 |     game_type_name: &'a str,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `GameType` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]      = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `RED_WITH_UNDERLINE` is never used
[INFO] [stdout]  --> src/colours/colours.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub const RED_WITH_UNDERLINE: &str = "\x1B[4;31m";
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `GREEN_WITH_UNDERLINE` is never used
[INFO] [stdout]  --> src/colours/colours.rs:7:11
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub const GREEN_WITH_UNDERLINE: &str = "\x1B[4;32m";
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `YELLOW` is never used
[INFO] [stdout]  --> src/colours/colours.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub const YELLOW: &str = "\x1B[33m";
[INFO] [stdout]   |           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BLUE` is never used
[INFO] [stdout]   --> src/colours/colours.rs:13:11
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub const BLUE: &str = "\x1B[34m";
[INFO] [stdout]    |           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `BLUE_WITH_UNDERLINE` is never used
[INFO] [stdout]   --> src/colours/colours.rs:15:11
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub const BLUE_WITH_UNDERLINE: &str = "\x1B[4;34m";
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:331:13
[INFO] [stdout]     |
[INFO] [stdout] 331 | /             writer_buf.write_all(
[INFO] [stdout] 332 | |                 format!(
[INFO] [stdout] 333 | |                     "\n\n{:>42}\n",
[INFO] [stdout] 334 | |                     YELLOW_WITH_UNDERLINE.to_owned()
[INFO] [stdout] ...   |
[INFO] [stdout] 338 | |                 .as_bytes(),
[INFO] [stdout] 339 | |             ); // TODO: error handling
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 331 |             let _ = writer_buf.write_all(
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:356:17
[INFO] [stdout]     |
[INFO] [stdout] 356 | /                 writer_buf.write_all(
[INFO] [stdout] 357 | |                     format!(
[INFO] [stdout] 358 | |                         "\n{:>width$} {} )\n",
[INFO] [stdout] 359 | |                         "(",
[INFO] [stdout] ...   |
[INFO] [stdout] 363 | |                     .as_bytes(),
[INFO] [stdout] 364 | |                 );
[INFO] [stdout]     | |_________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 356 |                 let _ = writer_buf.write_all(
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:384:17
[INFO] [stdout]     |
[INFO] [stdout] 384 | /                 writer_buf.write_all(
[INFO] [stdout] 385 | |                     format!(
[INFO] [stdout] 386 | |                         "  {:>width$}{}\n",
[INFO] [stdout] 387 | |                         "|",
[INFO] [stdout] ...   |
[INFO] [stdout] 391 | |                     .as_bytes(),
[INFO] [stdout] 392 | |                 );
[INFO] [stdout]     | |_________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 384 |                 let _ = writer_buf.write_all(
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:395:17
[INFO] [stdout]     |
[INFO] [stdout] 395 | /                 writer_buf.write_all(
[INFO] [stdout] 396 | |                     format!(
[INFO] [stdout] 397 | |                         "  {:<width$}|  {}\n",
[INFO] [stdout] 398 | |                         printable_answer[0],
[INFO] [stdout] ...   |
[INFO] [stdout] 402 | |                     .as_bytes(),
[INFO] [stdout] 403 | |                 );
[INFO] [stdout]     | |_________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 395 |                 let _ = writer_buf.write_all(
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:418:25
[INFO] [stdout]     |
[INFO] [stdout] 418 | /                         writer_buf.write_all(
[INFO] [stdout] 419 | |                             format!(
[INFO] [stdout] 420 | |                                 "  {:<width$}|  {}\n",
[INFO] [stdout] 421 | |                                 printable_answer[0],
[INFO] [stdout] ...   |
[INFO] [stdout] 425 | |                             .as_bytes(),
[INFO] [stdout] 426 | |                         );
[INFO] [stdout]     | |_________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 418 |                         let _ = writer_buf.write_all(
[INFO] [stdout]     |                         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:430:13
[INFO] [stdout]     |
[INFO] [stdout] 430 |             writer_buf.write_all("\n".as_bytes());
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 430 |             let _ = writer_buf.write_all("\n".as_bytes());
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `askForAnswer` should have a snake case name
[INFO] [stdout]    --> src/main.rs:434:8
[INFO] [stdout]     |
[INFO] [stdout] 434 |     fn askForAnswer(&self) -> Option<UserAnswer> {
[INFO] [stdout]     |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `ask_for_answer`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:437:13
[INFO] [stdout]     |
[INFO] [stdout] 437 |             io::stdout().flush(); // TODO: error handling
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 437 |             let _ = io::stdout().flush(); // TODO: error handling
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:445:13
[INFO] [stdout]     |
[INFO] [stdout] 445 |             io::stdout().flush(); // TODO: error handling
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 445 |             let _ = io::stdout().flush(); // TODO: error handling
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mut_askExercise` should have a snake case name
[INFO] [stdout]     --> src/main.rs:1040:8
[INFO] [stdout]      |
[INFO] [stdout] 1040 |     fn mut_askExercise(&mut self) -> i32 {
[INFO] [stdout]      |        ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `mut_ask_exercise`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1046:13
[INFO] [stdout]      |
[INFO] [stdout] 1046 |             io::stdout().flush(); // TODO: error handling
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1046 |             let _ = io::stdout().flush(); // TODO: error handling
[INFO] [stdout]      |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]     --> src/main.rs:1197:38
[INFO] [stdout]      |
[INFO] [stdout] 1197 | fn init_game_resources<'a>(cmd_args: &CommandArguments) -> (Game<'a>, Octave) {
[INFO] [stdout]      |                                      ^^^^^^^^^^^^^^^^^                ^^^^^^ the same lifetime is hidden here
[INFO] [stdout]      |                                      |
[INFO] [stdout]      |                                      the lifetime is elided here
[INFO] [stdout]      |
[INFO] [stdout]      = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]      = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]      |
[INFO] [stdout] 1197 | fn init_game_resources<'a>(cmd_args: &CommandArguments) -> (Game<'a>, Octave<'_>) {
[INFO] [stdout]      |                                                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]     --> src/main.rs:1238:9
[INFO] [stdout]      |
[INFO] [stdout] 1238 |         io::stdout().flush(); // TODO: error handling
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout] 1238 |         let _ = io::stdout().flush(); // TODO: error handling
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [optimized + debuginfo] target(s) in 11.02s
[INFO] running `Command { std: "docker" "inspect" "3ac4844c0109524be4eb4c24f942c77ef275246c867bbed28fcf60f0613991e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ac4844c0109524be4eb4c24f942c77ef275246c867bbed28fcf60f0613991e6", kill_on_drop: false }`
[INFO] [stdout] 3ac4844c0109524be4eb4c24f942c77ef275246c867bbed28fcf60f0613991e6
