[INFO] cloning repository https://github.com/shivamsinghAIMLops32/rust_advance
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shivamsinghAIMLops32/rust_advance" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FshivamsinghAIMLops32%2Frust_advance", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FshivamsinghAIMLops32%2Frust_advance'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6739ae680ea448ef022cccd8bf15f1ca99be5eef
[INFO] checking shivamsinghAIMLops32/rust_advance against 4d7c0cd298ace72490220301fa543d63a154f8ce for pr-164789
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FshivamsinghAIMLops32%2Frust_advance" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/shivamsinghAIMLops32/rust_advance
[INFO] finished tweaking git repo https://github.com/shivamsinghAIMLops32/rust_advance
[INFO] tweaked toml for git repo https://github.com/shivamsinghAIMLops32/rust_advance written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/shivamsinghAIMLops32/rust_advance on toolchain 4d7c0cd298ace72490220301fa543d63a154f8ce
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4d7c0cd298ace72490220301fa543d63a154f8ce" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/shivamsinghAIMLops32/rust_advance 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" "+4d7c0cd298ace72490220301fa543d63a154f8ce" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:c0af3998e971868164375a7dfb646c9933ddd1a3bdb00fa2041266763dc1eeab" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 62ec371383ab7fdc9305c29c064e5cb7b53465b4e64dbd99b8033bc16f6daf57
[INFO] running `Command { std: "docker" "start" "62ec371383ab7fdc9305c29c064e5cb7b53465b4e64dbd99b8033bc16f6daf57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "62ec371383ab7fdc9305c29c064e5cb7b53465b4e64dbd99b8033bc16f6daf57", 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" "62ec371383ab7fdc9305c29c064e5cb7b53465b4e64dbd99b8033bc16f6daf57" "/opt/rustwide/cargo-home/bin/cargo" "+4d7c0cd298ace72490220301fa543d63a154f8ce" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "62ec371383ab7fdc9305c29c064e5cb7b53465b4e64dbd99b8033bc16f6daf57", 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" "62ec371383ab7fdc9305c29c064e5cb7b53465b4e64dbd99b8033bc16f6daf57" "/opt/rustwide/cargo-home/bin/cargo" "+4d7c0cd298ace72490220301fa543d63a154f8ce" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking basics v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::string`
[INFO] [stdout]  --> src/impl_iterator.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::string;
[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::string`
[INFO] [stdout]  --> src/impl_iterator.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::string;
[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 variable: `s10`
[INFO] [stdout]   --> src/main.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |     let s10 = String::from("Hello");
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_s10`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s11`
[INFO] [stdout]   --> src/main.rs:64:13
[INFO] [stdout]    |
[INFO] [stdout] 64 |         let s11 = String::from("World!");
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_s11`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `odd_filter_using_refrence` is never used
[INFO] [stdout]   --> src/collections_rust.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn odd_filter_using_refrence(arr: &Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `CarProperties` is never used
[INFO] [stdout]  --> src/display_trait.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub trait CarProperties<'a> {
[INFO] [stdout]   |           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Car` is never constructed
[INFO] [stdout]  --> src/display_trait.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct Car<'a> {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `South`, `East`, and `West` are never constructed
[INFO] [stdout]  --> src/enum_prac.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub enum Direction {
[INFO] [stdout]   |          --------- variants in this enum
[INFO] [stdout] 2 |     North,
[INFO] [stdout] 3 |     South,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 4 |     East,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 5 |     West,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]  --> src/generics_rs.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn add<T: Add<Output = T>>(a: T, b: T) -> T {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_bigger` is never used
[INFO] [stdout]   --> src/generics_rs.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn return_bigger<T: PartialOrd + Clone>(a: T, b: T) -> T {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/impl_iterator.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UserList` is never constructed
[INFO] [stdout]   --> src/impl_iterator.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct UserList {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_array_using_iterator` is never used
[INFO] [stdout]  --> src/interator_prac.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn print_array_using_iterator(arr: &Vec<i32>) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_array_using_next` is never used
[INFO] [stdout]  --> src/interator_prac.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn print_array_using_next(arr: &Vec<i32>) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_array_using_next_mut` is never used
[INFO] [stdout]   --> src/interator_prac.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn print_array_using_next_mut(arr: &mut Vec<i32>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_array_using_into_iter` is never used
[INFO] [stdout]   --> src/interator_prac.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn print_array_using_into_iter(arr: Vec<i32>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_array_using_iterator` is never used
[INFO] [stdout]   --> src/interator_prac.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn sum_array_using_iterator(arr: Vec<i32>) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square_array_using_map` is never used
[INFO] [stdout]   --> src/interator_prac.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub fn square_array_using_map(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `filter_even_numbers` is never used
[INFO] [stdout]   --> src/interator_prac.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | pub fn filter_even_numbers(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `filter_and_square` is never used
[INFO] [stdout]   --> src/interator_prac.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn filter_and_square(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hm_iter` is never used
[INFO] [stdout]   --> src/interator_prac.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub fn hm_iter(hm: &std::collections::hash_map::HashMap<String, i32>) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]  --> src/lifetime_rust.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn longest<'a>(str1: &'a str, str2: &'a str) -> &'a str {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User2` is never constructed
[INFO] [stdout]   --> src/lifetime_rust.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct User2<'a> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `iml_user` is never used
[INFO] [stdout]   --> src/lifetime_rust.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn iml_user() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multithreading_example` is never used
[INFO] [stdout]  --> src/multithreading.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn multithreading_example() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multithreading_example_move` is never used
[INFO] [stdout]   --> src/multithreading.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn multithreading_example_move() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multithreading_example_mpsc` is never used
[INFO] [stdout]   --> src/multithreading.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub fn multithreading_example_mpsc() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `slices_from_string` is never used
[INFO] [stdout]  --> src/string_slices.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn slices_from_string() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_first_a` is never used
[INFO] [stdout]   --> src/string_slices.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn find_first_a(s: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s10`
[INFO] [stdout]   --> src/main.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |     let s10 = String::from("Hello");
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_s10`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Loggable` is never used
[INFO] [stdout]  --> src/trait_bound.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub trait Loggable: std::fmt::Debug {   // this is a trait that defines a contract for logging functionality. It requires any struct ...
[INFO] [stdout]   |           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s11`
[INFO] [stdout]   --> src/main.rs:64:13
[INFO] [stdout]    |
[INFO] [stdout] 64 |         let s11 = String::from("World!");
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_s11`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DbLogger` is never constructed
[INFO] [stdout]   --> src/trait_bound.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct DbLogger {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `log_message` is never used
[INFO] [stdout]   --> src/trait_bound.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn log_message<T,U>(str_example: &T, logger: &U) where T: Clone + Display, U: Loggable {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Animalsfeatures` is never used
[INFO] [stdout]  --> src/traits_rs.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Animalsfeatures {
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Dog` is never constructed
[INFO] [stdout]  --> src/traits_rs.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct Dog {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `odd_filter_using_refrence` is never used
[INFO] [stdout]   --> src/collections_rust.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn odd_filter_using_refrence(arr: &Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `CarProperties` is never used
[INFO] [stdout]  --> src/display_trait.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub trait CarProperties<'a> {
[INFO] [stdout]   |           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Car` is never constructed
[INFO] [stdout]  --> src/display_trait.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct Car<'a> {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `South`, `East`, and `West` are never constructed
[INFO] [stdout]  --> src/enum_prac.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub enum Direction {
[INFO] [stdout]   |          --------- variants in this enum
[INFO] [stdout] 2 |     North,
[INFO] [stdout] 3 |     South,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 4 |     East,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 5 |     West,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]  --> src/generics_rs.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn add<T: Add<Output = T>>(a: T, b: T) -> T {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_bigger` is never used
[INFO] [stdout]   --> src/generics_rs.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn return_bigger<T: PartialOrd + Clone>(a: T, b: T) -> T {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/impl_iterator.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UserList` is never constructed
[INFO] [stdout]   --> src/impl_iterator.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct UserList {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_array_using_iterator` is never used
[INFO] [stdout]  --> src/interator_prac.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn print_array_using_iterator(arr: &Vec<i32>) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_array_using_next` is never used
[INFO] [stdout]  --> src/interator_prac.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn print_array_using_next(arr: &Vec<i32>) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_array_using_next_mut` is never used
[INFO] [stdout]   --> src/interator_prac.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn print_array_using_next_mut(arr: &mut Vec<i32>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_array_using_into_iter` is never used
[INFO] [stdout]   --> src/interator_prac.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn print_array_using_into_iter(arr: Vec<i32>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `change_name`, `getter_name`, and `getter_age` are never used
[INFO] [stdout]   --> src/traits_rs.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl Dog {
[INFO] [stdout]    | -------- associated items in this implementation
[INFO] [stdout] 14 |     pub fn new(name: String, age: u8, color: String) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn change_name(&mut self, new_name: String) {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn getter_name(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     pub fn getter_age(&self) -> u8 {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_array_using_iterator` is never used
[INFO] [stdout]   --> src/interator_prac.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub fn sum_array_using_iterator(arr: Vec<i32>) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/result_options_enum.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct User {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square_array_using_map` is never used
[INFO] [stdout]   --> src/interator_prac.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | pub fn square_array_using_map(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_user_db` is never used
[INFO] [stdout]   --> src/result_options_enum.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn find_user_db(user_id: u32) -> Option<User> {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_user_db_iterable` is never used
[INFO] [stdout]   --> src/result_options_enum.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn find_user_db_iterable(user_id: u32) -> Option<User> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `filter_even_numbers` is never used
[INFO] [stdout]   --> src/interator_prac.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | pub fn filter_even_numbers(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_to_string` is never used
[INFO] [stdout]   --> src/result_options_enum.rs:58:8
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub fn read_to_string(file_path: &str) -> Result<String, std::io::Error> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_file_read_example` is never used
[INFO] [stdout]   --> src/result_options_enum.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub fn run_file_read_example() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `filter_and_square` is never used
[INFO] [stdout]   --> src/interator_prac.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn filter_and_square(arr: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hm_iter` is never used
[INFO] [stdout]   --> src/interator_prac.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub fn hm_iter(hm: &std::collections::hash_map::HashMap<String, i32>) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]  --> src/lifetime_rust.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn longest<'a>(str1: &'a str, str2: &'a str) -> &'a str {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User2` is never constructed
[INFO] [stdout]   --> src/lifetime_rust.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct User2<'a> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `iml_user` is never used
[INFO] [stdout]   --> src/lifetime_rust.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn iml_user() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multithreading_example` is never used
[INFO] [stdout]  --> src/multithreading.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn multithreading_example() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multithreading_example_move` is never used
[INFO] [stdout]   --> src/multithreading.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub fn multithreading_example_move() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multithreading_example_mpsc` is never used
[INFO] [stdout]   --> src/multithreading.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub fn multithreading_example_mpsc() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `slices_from_string` is never used
[INFO] [stdout]  --> src/string_slices.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn slices_from_string() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_first_a` is never used
[INFO] [stdout]   --> src/string_slices.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn find_first_a(s: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Loggable` is never used
[INFO] [stdout]  --> src/trait_bound.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub trait Loggable: std::fmt::Debug {   // this is a trait that defines a contract for logging functionality. It requires any struct ...
[INFO] [stdout]   |           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DbLogger` is never constructed
[INFO] [stdout]   --> src/trait_bound.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct DbLogger {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `log_message` is never used
[INFO] [stdout]   --> src/trait_bound.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn log_message<T,U>(str_example: &T, logger: &U) where T: Clone + Display, U: Loggable {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Animalsfeatures` is never used
[INFO] [stdout]  --> src/traits_rs.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Animalsfeatures {
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Dog` is never constructed
[INFO] [stdout]  --> src/traits_rs.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct Dog {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `change_name`, `getter_name`, and `getter_age` are never used
[INFO] [stdout]   --> src/traits_rs.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl Dog {
[INFO] [stdout]    | -------- associated items in this implementation
[INFO] [stdout] 14 |     pub fn new(name: String, age: u8, color: String) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn change_name(&mut self, new_name: String) {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn getter_name(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     pub fn getter_age(&self) -> u8 {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/result_options_enum.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct User {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_user_db` is never used
[INFO] [stdout]   --> src/result_options_enum.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn find_user_db(user_id: u32) -> Option<User> {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_user_db_iterable` is never used
[INFO] [stdout]   --> src/result_options_enum.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn find_user_db_iterable(user_id: u32) -> Option<User> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_to_string` is never used
[INFO] [stdout]   --> src/result_options_enum.rs:58:8
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub fn read_to_string(file_path: &str) -> Result<String, std::io::Error> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_file_read_example` is never used
[INFO] [stdout]   --> src/result_options_enum.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub fn run_file_read_example() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.10s
[INFO] running `Command { std: "docker" "inspect" "62ec371383ab7fdc9305c29c064e5cb7b53465b4e64dbd99b8033bc16f6daf57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62ec371383ab7fdc9305c29c064e5cb7b53465b4e64dbd99b8033bc16f6daf57", kill_on_drop: false }`
[INFO] [stdout] 62ec371383ab7fdc9305c29c064e5cb7b53465b4e64dbd99b8033bc16f6daf57
