[INFO] cloning repository https://github.com/madmax983/rust-interview-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/madmax983/rust-interview-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmadmax983%2Frust-interview-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmadmax983%2Frust-interview-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c54ed3b85e332f27f3c46ea78e20b076d4883f8f
[INFO] checking madmax983/rust-interview-practice against try#93086cfebfccb79083c59d0d3b2052944bba643c for pr-146440-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmadmax983%2Frust-interview-practice" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/madmax983/rust-interview-practice
[INFO] finished tweaking git repo https://github.com/madmax983/rust-interview-practice
[INFO] tweaked toml for git repo https://github.com/madmax983/rust-interview-practice written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/madmax983/rust-interview-practice on toolchain 93086cfebfccb79083c59d0d3b2052944bba643c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/madmax983/rust-interview-practice 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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 08ee35c31c7c074f162b145fd8f2bab9f1a6c9ce9af48fa6f277758a7871e9cb
[INFO] running `Command { std: "docker" "start" "-a" "08ee35c31c7c074f162b145fd8f2bab9f1a6c9ce9af48fa6f277758a7871e9cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "08ee35c31c7c074f162b145fd8f2bab9f1a6c9ce9af48fa6f277758a7871e9cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08ee35c31c7c074f162b145fd8f2bab9f1a6c9ce9af48fa6f277758a7871e9cb", kill_on_drop: false }`
[INFO] [stdout] 08ee35c31c7c074f162b145fd8f2bab9f1a6c9ce9af48fa6f277758a7871e9cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6250075e0719f4bd3f005f6b91eb098f0eae66d3b98551544fdd068f52247aad
[INFO] running `Command { std: "docker" "start" "-a" "6250075e0719f4bd3f005f6b91eb098f0eae66d3b98551544fdd068f52247aad", kill_on_drop: false }`
[INFO] [stderr]     Checking crc32fast v1.5.0
[INFO] [stderr]     Checking rust-interview-practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused macro definition: `create_struct`
[INFO] [stdout]    --> src/fundamentals/macros.rs:113:14
[INFO] [stdout]     |
[INFO] [stdout] 113 | macro_rules! create_struct {
[INFO] [stdout]     |              ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_macros)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `create_function`
[INFO] [stdout]    --> src/fundamentals/macros.rs:179:14
[INFO] [stdout]     |
[INFO] [stdout] 179 | macro_rules! create_function {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `string_enum`
[INFO] [stdout]    --> src/fundamentals/macros.rs:248:14
[INFO] [stdout]     |
[INFO] [stdout] 248 | macro_rules! string_enum {
[INFO] [stdout]     |              ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `html`
[INFO] [stdout]    --> src/fundamentals/macros.rs:319:14
[INFO] [stdout]     |
[INFO] [stdout] 319 | macro_rules! html {
[INFO] [stdout]     |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `factorial`
[INFO] [stdout]    --> src/fundamentals/macros.rs:367:14
[INFO] [stdout]     |
[INFO] [stdout] 367 | macro_rules! factorial {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `tree`
[INFO] [stdout]    --> src/fundamentals/macros.rs:377:14
[INFO] [stdout]     |
[INFO] [stdout] 377 | macro_rules! tree {
[INFO] [stdout]     |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `use_crate_item`
[INFO] [stdout]    --> src/fundamentals/macros.rs:408:14
[INFO] [stdout]     |
[INFO] [stdout] 408 | macro_rules! use_crate_item {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `impl_display_for_struct`
[INFO] [stdout]    --> src/fundamentals/macros.rs:597:14
[INFO] [stdout]     |
[INFO] [stdout] 597 | macro_rules! impl_display_for_struct {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `test_cases`
[INFO] [stdout]    --> src/fundamentals/macros.rs:612:14
[INFO] [stdout]     |
[INFO] [stdout] 612 | macro_rules! test_cases {
[INFO] [stdout]     |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Reverse`
[INFO] [stdout]   --> src/systems/deflate.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | use std::cmp::Reverse;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::any::Any`
[INFO] [stdout]   --> src/systems/garbage_collector.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | use std::any::Any;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]   --> src/systems/garbage_collector.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use std::collections::HashSet;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SystemTime`
[INFO] [stdout]   --> src/systems/job_queue.rs:27:36
[INFO] [stdout]    |
[INFO] [stdout] 27 | use std::time::{Duration, Instant, SystemTime};
[INFO] [stdout]    |                                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/systems/metrics_registry.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 276 | /         /// ⚡ BOLT OPTIMIZATION: Avoid intermediate string allocations during metrics export.
[INFO] [stdout] 277 | |         /// Replaced `output.push_str(&format!(...))` with `writeln!(output, ...)`.
[INFO] [stdout] 278 | |         /// `format!` creates an intermediate String on the heap, which is then copied into `output` and dropped.
[INFO] [stdout] 279 | |         /// `writeln!` writes directly into the `String` buffer, eliminating the intermediate allocation.
[INFO] [stdout]     | |_________________________________________________________________________________________________________^
[INFO] [stdout] 280 |           // Export Counters
[INFO] [stdout] 281 |           let counters = self.counters.read().unwrap();
[INFO] [stdout]     |           --------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout]     = note: `#[warn(unused_doc_comments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `create_struct`
[INFO] [stdout]    --> src/fundamentals/macros.rs:113:14
[INFO] [stdout]     |
[INFO] [stdout] 113 | macro_rules! create_struct {
[INFO] [stdout]     |              ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_macros)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `create_function`
[INFO] [stdout]    --> src/fundamentals/macros.rs:179:14
[INFO] [stdout]     |
[INFO] [stdout] 179 | macro_rules! create_function {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `string_enum`
[INFO] [stdout]    --> src/fundamentals/macros.rs:248:14
[INFO] [stdout]     |
[INFO] [stdout] 248 | macro_rules! string_enum {
[INFO] [stdout]     |              ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `html`
[INFO] [stdout]    --> src/fundamentals/macros.rs:319:14
[INFO] [stdout]     |
[INFO] [stdout] 319 | macro_rules! html {
[INFO] [stdout]     |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `factorial`
[INFO] [stdout]    --> src/fundamentals/macros.rs:367:14
[INFO] [stdout]     |
[INFO] [stdout] 367 | macro_rules! factorial {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `tree`
[INFO] [stdout]    --> src/fundamentals/macros.rs:377:14
[INFO] [stdout]     |
[INFO] [stdout] 377 | macro_rules! tree {
[INFO] [stdout]     |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `use_crate_item`
[INFO] [stdout]    --> src/fundamentals/macros.rs:408:14
[INFO] [stdout]     |
[INFO] [stdout] 408 | macro_rules! use_crate_item {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `impl_display_for_struct`
[INFO] [stdout]    --> src/fundamentals/macros.rs:597:14
[INFO] [stdout]     |
[INFO] [stdout] 597 | macro_rules! impl_display_for_struct {
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `test_cases`
[INFO] [stdout]    --> src/fundamentals/macros.rs:612:14
[INFO] [stdout]     |
[INFO] [stdout] 612 | macro_rules! test_cases {
[INFO] [stdout]     |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/strings/parser_combinator.rs:170:13
[INFO] [stdout]     |
[INFO] [stdout] 170 |         let mut chars = input.chars();
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Reverse`
[INFO] [stdout]   --> src/systems/deflate.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | use std::cmp::Reverse;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::any::Any`
[INFO] [stdout]   --> src/systems/garbage_collector.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | use std::any::Any;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]   --> src/systems/garbage_collector.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use std::collections::HashSet;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SystemTime`
[INFO] [stdout]   --> src/systems/job_queue.rs:27:36
[INFO] [stdout]    |
[INFO] [stdout] 27 | use std::time::{Duration, Instant, SystemTime};
[INFO] [stdout]    |                                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]    --> src/systems/metrics_registry.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 276 | /         /// ⚡ BOLT OPTIMIZATION: Avoid intermediate string allocations during metrics export.
[INFO] [stdout] 277 | |         /// Replaced `output.push_str(&format!(...))` with `writeln!(output, ...)`.
[INFO] [stdout] 278 | |         /// `format!` creates an intermediate String on the heap, which is then copied into `output` and dropped.
[INFO] [stdout] 279 | |         /// `writeln!` writes directly into the `String` buffer, eliminating the intermediate allocation.
[INFO] [stdout]     | |_________________________________________________________________________________________________________^
[INFO] [stdout] 280 |           // Export Counters
[INFO] [stdout] 281 |           let counters = self.counters.read().unwrap();
[INFO] [stdout]     |           --------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]     |
[INFO] [stdout]     = help: use `//` for a plain comment
[INFO] [stdout]     = note: `#[warn(unused_doc_comments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/strings/parser_combinator.rs:170:13
[INFO] [stdout]     |
[INFO] [stdout] 170 |         let mut chars = input.chars();
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `ContextImpl` is never constructed
[INFO] [stdout]   --> src/concurrency/actor_system.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct ContextImpl {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]    = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> src/concurrency/work_stealing_pool.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 92 | struct WorkerState {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] 93 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `source` is never read
[INFO] [stdout]   --> src/data_structures/graph.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 83 | struct Edge<E> {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 84 |     /// The node index where this edge originates.
[INFO] [stdout] 85 |     source: NodeIndex,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Edge` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> src/data_structures/hashed_wheel_timer.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | struct TaskEntry {
[INFO] [stdout]    |        --------- field in this struct
[INFO] [stdout] 52 |     id: TaskId,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `host`, `port`, `timeout`, and `max_connections` are never read
[INFO] [stdout]   --> src/fundamentals/design_patterns.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Server {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 15 |     host: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 16 |     port: u16,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 17 |     timeout: u64,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 18 |     max_connections: u32,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Server` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `max_connections` is never used
[INFO] [stdout]   --> src/fundamentals/design_patterns.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl ServerBuilder {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 53 |     fn max_connections(mut self, max: u32) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `close` is never used
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:273:8
[INFO] [stdout]     |
[INFO] [stdout] 264 | impl FileHandle<Open> {
[INFO] [stdout]     | --------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 273 |     fn close(self) -> FileHandle<Closed> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MutexGuard` is never constructed
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:344:8
[INFO] [stdout]     |
[INFO] [stdout] 344 | struct MutexGuard<'a, T> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Fibonacci` is never constructed
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:604:8
[INFO] [stdout]     |
[INFO] [stdout] 604 | struct Fibonacci {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:610:8
[INFO] [stdout]     |
[INFO] [stdout] 609 | impl Fibonacci {
[INFO] [stdout]     | -------------- associated function in this implementation
[INFO] [stdout] 610 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ExternalType` is never constructed
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:697:8
[INFO] [stdout]     |
[INFO] [stdout] 697 | struct ExternalType {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DisplayAdapter` is never constructed
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:703:8
[INFO] [stdout]     |
[INFO] [stdout] 703 | struct DisplayAdapter(ExternalType);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Wrapper` is never constructed
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:713:8
[INFO] [stdout]     |
[INFO] [stdout] 713 | struct Wrapper<T>(T);
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Custom` is never constructed
[INFO] [stdout]   --> src/fundamentals/error_types.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 49 | enum MyError {
[INFO] [stdout]    |      ------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 52 |     Custom(String),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MyError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Missing` and `Invalid` are never constructed
[INFO] [stdout]    --> src/fundamentals/error_types.rs:616:5
[INFO] [stdout]     |
[INFO] [stdout] 615 | enum ValidationError {
[INFO] [stdout]     |      --------------- variants in this enum
[INFO] [stdout] 616 |     Missing(String),
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 617 |     Invalid(String, String),
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `ValidationError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `sum_x` are never used
[INFO] [stdout]    --> src/fundamentals/performance.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 115 | impl ParticlesSOA {
[INFO] [stdout]     | ----------------- associated items in this implementation
[INFO] [stdout] 116 |     fn new(capacity: usize) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 126 |     fn sum_x(&self) -> f32 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `sum_x` are never used
[INFO] [stdout]    --> src/fundamentals/performance.rs:147:8
[INFO] [stdout]     |
[INFO] [stdout] 146 | impl ParticlesAOS {
[INFO] [stdout]     | ----------------- associated items in this implementation
[INFO] [stdout] 147 |     fn new(capacity: usize) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 154 |     fn sum_x(&self) -> f32 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `get` are never used
[INFO] [stdout]    --> src/fundamentals/performance.rs:485:14
[INFO] [stdout]     |
[INFO] [stdout] 484 | impl<T> LazyInit<T> {
[INFO] [stdout]     | ------------------- associated items in this implementation
[INFO] [stdout] 485 |     const fn new(init: fn() -> T) -> Self {
[INFO] [stdout]     |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 489 |     fn get(&mut self) -> &T {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Result` is never used
[INFO] [stdout]   --> src/fundamentals/types_and_traits.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 | type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `NodeId` is never used
[INFO] [stdout]   --> src/fundamentals/types_and_traits.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | type NodeId = usize;
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Graph` is never used
[INFO] [stdout]   --> src/fundamentals/types_and_traits.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | type Graph = Vec<Vec<NodeId>>;
[INFO] [stdout]    |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `f` is never read
[INFO] [stdout]   --> src/fundamentals/unsafe_rust.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 49 | union MyUnion {
[INFO] [stdout]    |       ------- field in this union
[INFO] [stdout] 50 |     i: i32,
[INFO] [stdout] 51 |     f: f32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CPoint` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:168:8
[INFO] [stdout]     |
[INFO] [stdout] 168 | struct CPoint {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OpaqueType` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:193:8
[INFO] [stdout]     |
[INFO] [stdout] 193 | struct OpaqueType {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyType` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:206:8
[INFO] [stdout]     |
[INFO] [stdout] 206 | struct MyType {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyCell` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:217:8
[INFO] [stdout]     |
[INFO] [stdout] 217 | struct MyCell<T> {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get`, and `set` are never used
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:222:8
[INFO] [stdout]     |
[INFO] [stdout] 221 | impl<T> MyCell<T> {
[INFO] [stdout]     | ----------------- associated items in this implementation
[INFO] [stdout] 222 |     fn new(value: T) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 228 |     fn get(&self) -> &T {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 234 |     fn set(&self, value: T) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyVec` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:334:8
[INFO] [stdout]     |
[INFO] [stdout] 334 | struct MyVec<T> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push`, and `grow` are never used
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:342:8
[INFO] [stdout]     |
[INFO] [stdout] 340 | impl<T> MyVec<T> {
[INFO] [stdout]     | ---------------- associated items in this implementation
[INFO] [stdout] 341 |     /// Creates a new empty vector.
[INFO] [stdout] 342 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 357 |     fn push(&mut self, value: T) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 370 |     fn grow(&mut self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Buffer` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:495:8
[INFO] [stdout]     |
[INFO] [stdout] 495 | struct Buffer {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `write_u32` are never used
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:500:8
[INFO] [stdout]     |
[INFO] [stdout] 499 | impl Buffer {
[INFO] [stdout]     | ----------- associated items in this implementation
[INFO] [stdout] 500 |     fn new(size: usize) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 507 |     fn write_u32(&mut self, index: usize, value: u32) -> Result<(), String> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LinkedNode` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:525:8
[INFO] [stdout]     |
[INFO] [stdout] 525 | struct LinkedNode {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Iter` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:533:8
[INFO] [stdout]     |
[INFO] [stdout] 533 | struct Iter<'a, T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `file_id` and `timestamp` are never read
[INFO] [stdout]   --> src/systems/bitcask.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct EntryLocation {
[INFO] [stdout]    |        ------------- fields in this struct
[INFO] [stdout] 58 |     file_id: u32,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 61 |     timestamp: u64,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `EntryLocation` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `base_path` is never read
[INFO] [stdout]   --> src/systems/bitcask.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub struct Bitcask {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 71 |     base_path: PathBuf,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id`, `queue_name`, and `job_queue` are never read
[INFO] [stdout]    --> src/systems/job_queue.rs:330:5
[INFO] [stdout]     |
[INFO] [stdout] 329 | pub struct Worker {
[INFO] [stdout]     |            ------ fields in this struct
[INFO] [stdout] 330 |     id: usize,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 331 |     queue_name: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 332 |     job_queue: JobQueue,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-interview-practice` (lib) due to 1 previous error; 50 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]    --> src/concurrency/lock_free_queue.rs:328:51
[INFO] [stdout]     |
[INFO] [stdout] 328 |                     while let Err(PushError::Full(item)) = q.push(i) {
[INFO] [stdout]     |                                                   ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> src/concurrency/work_stealing_pool.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 92 | struct WorkerState {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] 93 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `source` is never read
[INFO] [stdout]   --> src/data_structures/graph.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 83 | struct Edge<E> {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 84 |     /// The node index where this edge originates.
[INFO] [stdout] 85 |     source: NodeIndex,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Edge` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> src/data_structures/hashed_wheel_timer.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | struct TaskEntry {
[INFO] [stdout]    |        --------- field in this struct
[INFO] [stdout] 52 |     id: TaskId,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `host`, `port`, `timeout`, and `max_connections` are never read
[INFO] [stdout]   --> src/fundamentals/design_patterns.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Server {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 15 |     host: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 16 |     port: u16,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 17 |     timeout: u64,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 18 |     max_connections: u32,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Server` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `max_connections` is never used
[INFO] [stdout]   --> src/fundamentals/design_patterns.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl ServerBuilder {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 53 |     fn max_connections(mut self, max: u32) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `close` is never used
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:273:8
[INFO] [stdout]     |
[INFO] [stdout] 264 | impl FileHandle<Open> {
[INFO] [stdout]     | --------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 273 |     fn close(self) -> FileHandle<Closed> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MutexGuard` is never constructed
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:344:8
[INFO] [stdout]     |
[INFO] [stdout] 344 | struct MutexGuard<'a, T> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Fibonacci` is never constructed
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:604:8
[INFO] [stdout]     |
[INFO] [stdout] 604 | struct Fibonacci {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:610:8
[INFO] [stdout]     |
[INFO] [stdout] 609 | impl Fibonacci {
[INFO] [stdout]     | -------------- associated function in this implementation
[INFO] [stdout] 610 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ExternalType` is never constructed
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:697:8
[INFO] [stdout]     |
[INFO] [stdout] 697 | struct ExternalType {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DisplayAdapter` is never constructed
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:703:8
[INFO] [stdout]     |
[INFO] [stdout] 703 | struct DisplayAdapter(ExternalType);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Wrapper` is never constructed
[INFO] [stdout]    --> src/fundamentals/design_patterns.rs:713:8
[INFO] [stdout]     |
[INFO] [stdout] 713 | struct Wrapper<T>(T);
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Custom` is never constructed
[INFO] [stdout]   --> src/fundamentals/error_types.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 49 | enum MyError {
[INFO] [stdout]    |      ------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 52 |     Custom(String),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MyError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Missing` and `Invalid` are never constructed
[INFO] [stdout]    --> src/fundamentals/error_types.rs:616:5
[INFO] [stdout]     |
[INFO] [stdout] 615 | enum ValidationError {
[INFO] [stdout]     |      --------------- variants in this enum
[INFO] [stdout] 616 |     Missing(String),
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 617 |     Invalid(String, String),
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `ValidationError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `sum_x` are never used
[INFO] [stdout]    --> src/fundamentals/performance.rs:116:8
[INFO] [stdout]     |
[INFO] [stdout] 115 | impl ParticlesSOA {
[INFO] [stdout]     | ----------------- associated items in this implementation
[INFO] [stdout] 116 |     fn new(capacity: usize) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 126 |     fn sum_x(&self) -> f32 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `sum_x` are never used
[INFO] [stdout]    --> src/fundamentals/performance.rs:147:8
[INFO] [stdout]     |
[INFO] [stdout] 146 | impl ParticlesAOS {
[INFO] [stdout]     | ----------------- associated items in this implementation
[INFO] [stdout] 147 |     fn new(capacity: usize) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 154 |     fn sum_x(&self) -> f32 {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `get` are never used
[INFO] [stdout]    --> src/fundamentals/performance.rs:485:14
[INFO] [stdout]     |
[INFO] [stdout] 484 | impl<T> LazyInit<T> {
[INFO] [stdout]     | ------------------- associated items in this implementation
[INFO] [stdout] 485 |     const fn new(init: fn() -> T) -> Self {
[INFO] [stdout]     |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 489 |     fn get(&mut self) -> &T {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `temp_file` is never read
[INFO] [stdout]    --> src/fundamentals/testing.rs:171:9
[INFO] [stdout]     |
[INFO] [stdout] 169 |     struct TestContext {
[INFO] [stdout]     |            ----------- field in this struct
[INFO] [stdout] 170 |         data: Vec<i32>,
[INFO] [stdout] 171 |         temp_file: String,
[INFO] [stdout]     |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RealDataStore` is never constructed
[INFO] [stdout]    --> src/fundamentals/testing.rs:361:12
[INFO] [stdout]     |
[INFO] [stdout] 361 |     struct RealDataStore;
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fetch_data` is never used
[INFO] [stdout]    --> src/fundamentals/testing.rs:418:14
[INFO] [stdout]     |
[INFO] [stdout] 418 |     async fn fetch_data(id: u32) -> String {
[INFO] [stdout]     |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Result` is never used
[INFO] [stdout]   --> src/fundamentals/types_and_traits.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 | type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `NodeId` is never used
[INFO] [stdout]   --> src/fundamentals/types_and_traits.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | type NodeId = usize;
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Graph` is never used
[INFO] [stdout]   --> src/fundamentals/types_and_traits.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | type Graph = Vec<Vec<NodeId>>;
[INFO] [stdout]    |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `f` is never read
[INFO] [stdout]   --> src/fundamentals/unsafe_rust.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 49 | union MyUnion {
[INFO] [stdout]    |       ------- field in this union
[INFO] [stdout] 50 |     i: i32,
[INFO] [stdout] 51 |     f: f32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CPoint` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:168:8
[INFO] [stdout]     |
[INFO] [stdout] 168 | struct CPoint {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OpaqueType` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:193:8
[INFO] [stdout]     |
[INFO] [stdout] 193 | struct OpaqueType {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyType` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:206:8
[INFO] [stdout]     |
[INFO] [stdout] 206 | struct MyType {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyCell` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:217:8
[INFO] [stdout]     |
[INFO] [stdout] 217 | struct MyCell<T> {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get`, and `set` are never used
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:222:8
[INFO] [stdout]     |
[INFO] [stdout] 221 | impl<T> MyCell<T> {
[INFO] [stdout]     | ----------------- associated items in this implementation
[INFO] [stdout] 222 |     fn new(value: T) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 228 |     fn get(&self) -> &T {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 234 |     fn set(&self, value: T) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Buffer` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:495:8
[INFO] [stdout]     |
[INFO] [stdout] 495 | struct Buffer {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `write_u32` are never used
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:500:8
[INFO] [stdout]     |
[INFO] [stdout] 499 | impl Buffer {
[INFO] [stdout]     | ----------- associated items in this implementation
[INFO] [stdout] 500 |     fn new(size: usize) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 507 |     fn write_u32(&mut self, index: usize, value: u32) -> Result<(), String> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LinkedNode` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:525:8
[INFO] [stdout]     |
[INFO] [stdout] 525 | struct LinkedNode {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Iter` is never constructed
[INFO] [stdout]    --> src/fundamentals/unsafe_rust.rs:533:8
[INFO] [stdout]     |
[INFO] [stdout] 533 | struct Iter<'a, T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `file_id` and `timestamp` are never read
[INFO] [stdout]   --> src/systems/bitcask.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct EntryLocation {
[INFO] [stdout]    |        ------------- fields in this struct
[INFO] [stdout] 58 |     file_id: u32,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 61 |     timestamp: u64,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `EntryLocation` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `base_path` is never read
[INFO] [stdout]   --> src/systems/bitcask.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub struct Bitcask {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 71 |     base_path: PathBuf,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id`, `queue_name`, and `job_queue` are never read
[INFO] [stdout]    --> src/systems/job_queue.rs:330:5
[INFO] [stdout]     |
[INFO] [stdout] 329 | pub struct Worker {
[INFO] [stdout]     |            ------ fields in this struct
[INFO] [stdout] 330 |     id: usize,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 331 |     queue_name: String,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 332 |     job_queue: JobQueue,
[INFO] [stdout]     |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `barrier::Barrier::new` that must be used
[INFO] [stdout]    --> src/concurrency/barrier.rs:192:9
[INFO] [stdout]     |
[INFO] [stdout] 192 |         Barrier::new(0);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[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] 192 |         let _ = Barrier::new(0);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "6250075e0719f4bd3f005f6b91eb098f0eae66d3b98551544fdd068f52247aad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6250075e0719f4bd3f005f6b91eb098f0eae66d3b98551544fdd068f52247aad", kill_on_drop: false }`
[INFO] [stdout] 6250075e0719f4bd3f005f6b91eb098f0eae66d3b98551544fdd068f52247aad
