[INFO] cloning repository https://github.com/SonyaGorban/rust_by_pract
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/SonyaGorban/rust_by_pract" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSonyaGorban%2Frust_by_pract", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSonyaGorban%2Frust_by_pract'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c98720f161aef3a8f36c875523390ead102bdeab
[INFO] checking SonyaGorban/rust_by_pract against try#b047d5f4496a7526d91d0dddea494c05853f2a7b for pr-122661-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSonyaGorban%2Frust_by_pract" "/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/SonyaGorban/rust_by_pract
[INFO] finished tweaking git repo https://github.com/SonyaGorban/rust_by_pract
[INFO] tweaked toml for git repo https://github.com/SonyaGorban/rust_by_pract written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/SonyaGorban/rust_by_pract on toolchain b047d5f4496a7526d91d0dddea494c05853f2a7b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b047d5f4496a7526d91d0dddea494c05853f2a7b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/SonyaGorban/rust_by_pract 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" "+b047d5f4496a7526d91d0dddea494c05853f2a7b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+b047d5f4496a7526d91d0dddea494c05853f2a7b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b06358c4554806e949938fbc28cda09d3db57bf097f4f8d3d2d57a5526670464
[INFO] running `Command { std: "docker" "start" "-a" "b06358c4554806e949938fbc28cda09d3db57bf097f4f8d3d2d57a5526670464", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b06358c4554806e949938fbc28cda09d3db57bf097f4f8d3d2d57a5526670464", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b06358c4554806e949938fbc28cda09d3db57bf097f4f8d3d2d57a5526670464", kill_on_drop: false }`
[INFO] [stdout] b06358c4554806e949938fbc28cda09d3db57bf097f4f8d3d2d57a5526670464
[INFO] checking SonyaGorban/rust_by_pract against try#b047d5f4496a7526d91d0dddea494c05853f2a7b for pr-122661-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSonyaGorban%2Frust_by_pract" "/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/SonyaGorban/rust_by_pract
[INFO] finished tweaking git repo https://github.com/SonyaGorban/rust_by_pract
[INFO] tweaked toml for git repo https://github.com/SonyaGorban/rust_by_pract written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/SonyaGorban/rust_by_pract on toolchain b047d5f4496a7526d91d0dddea494c05853f2a7b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b047d5f4496a7526d91d0dddea494c05853f2a7b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/SonyaGorban/rust_by_pract 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" "+b047d5f4496a7526d91d0dddea494c05853f2a7b" "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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+b047d5f4496a7526d91d0dddea494c05853f2a7b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ca4bea556a286face0199d180f9b65a75ba7c8732cc103da9eb114e6797a3403
[INFO] running `Command { std: "docker" "start" "-a" "ca4bea556a286face0199d180f9b65a75ba7c8732cc103da9eb114e6797a3403", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ca4bea556a286face0199d180f9b65a75ba7c8732cc103da9eb114e6797a3403", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca4bea556a286face0199d180f9b65a75ba7c8732cc103da9eb114e6797a3403", kill_on_drop: false }`
[INFO] [stdout] ca4bea556a286face0199d180f9b65a75ba7c8732cc103da9eb114e6797a3403
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+b047d5f4496a7526d91d0dddea494c05853f2a7b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 083cf9700f4135b2a04db7856a45e6f354dcf8551ac0ab6129f134c914e47d4b
[INFO] running `Command { std: "docker" "start" "-a" "083cf9700f4135b2a04db7856a45e6f354dcf8551ac0ab6129f134c914e47d4b", kill_on_drop: false }`
[INFO] [stderr]     Checking untitled2 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::ffi::CString`
[INFO] [stdout]  --> src/ownership_borrowing/ownership.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::ffi::CString;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Sub`
[INFO] [stdout]  --> src/generics_traits/advanced_traits.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::ops::Sub;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]    --> src/collection_types/string.rs:109:5
[INFO] [stdout]     |
[INFO] [stdout] 109 | use std::mem;
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/collection_types/hashmap.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/flow_control.rs:198:9
[INFO] [stdout]     |
[INFO] [stdout] 198 |         'inner2: loop {
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ffi::CString`
[INFO] [stdout]  --> src/ownership_borrowing/ownership.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::ffi::CString;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/generics_traits/traits.rs:62:25
[INFO] [stdout]    |
[INFO] [stdout] 62 |     let _this_is_true = (_one_second == _one_second);
[INFO] [stdout]    |                         ^                          ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 62 -     let _this_is_true = (_one_second == _one_second);
[INFO] [stdout] 62 +     let _this_is_true = _one_second == _one_second;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/generics_traits/traits.rs:63:26
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let _this_is_false = (_one_second > _one_second);
[INFO] [stdout]    |                          ^                         ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 63 -     let _this_is_false = (_one_second > _one_second);
[INFO] [stdout] 63 +     let _this_is_false = _one_second > _one_second;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Sub`
[INFO] [stdout]  --> src/generics_traits/advanced_traits.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::ops::Sub;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/variables.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let mut x: i32 = 1;
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/variables.rs:62:10
[INFO] [stdout]    |
[INFO] [stdout] 62 |      let x = x;
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/variables.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let y = 4;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/variables.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let y = "I can also be bound to text!";
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/ownership_borrowing/reference_borrowing.rs:34:18
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn borrow_object(s: &String) {}
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/ownership_borrowing/reference_borrowing.rs:114:19
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn borrow_object1(s: &mut String) {}
[INFO] [stdout]     |                   ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/ownership_borrowing/reference_borrowing.rs:129:19
[INFO] [stdout]     |
[INFO] [stdout] 129 | fn borrow_object2(s: &String) {}
[INFO] [stdout]     |                   ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]   --> src/pattern_match/match1.rs:67:30
[INFO] [stdout]    |
[INFO] [stdout] 67 |         Message::ChangeColor(r, g, b) => {
[INFO] [stdout]    |                              ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/collection_types/vector.rs:28:11
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn is_vec(v: &Vec<u8>) {}
[INFO] [stdout]    |           ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TrafficLight` is never constructed
[INFO] [stdout]   --> src/method.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct TrafficLight {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `show_state` and `change_state` are never used
[INFO] [stdout]   --> src/method.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 48 | impl TrafficLight {
[INFO] [stdout]    | ----------------- methods in this implementation
[INFO] [stdout] 49 |     // using `Self` to fill in the blank
[INFO] [stdout] 50 |     pub fn show_state(self: &Self) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 55 |     pub fn change_state(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TrafficLight1` is never constructed
[INFO] [stdout]   --> src/method.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 | struct TrafficLight1 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `get_state` are never used
[INFO] [stdout]   --> src/method.rs:72:12
[INFO] [stdout]    |
[INFO] [stdout] 68 | impl TrafficLight {
[INFO] [stdout]    | ----------------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 72 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 78 |     pub fn get_state(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/method.rs:89:8
[INFO] [stdout]    |
[INFO] [stdout] 89 | struct Rectangle {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `area` is never used
[INFO] [stdout]   --> src/method.rs:96:8
[INFO] [stdout]    |
[INFO] [stdout] 95 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 96 |     fn area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `can_hold` is never used
[INFO] [stdout]    --> src/method.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 101 | impl Rectangle {
[INFO] [stdout]     | -------------- method in this implementation
[INFO] [stdout] 102 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `TrafficLightColor` is never used
[INFO] [stdout]    --> src/method.rs:111:6
[INFO] [stdout]     |
[INFO] [stdout] 111 | enum TrafficLightColor {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `color` is never used
[INFO] [stdout]    --> src/method.rs:119:8
[INFO] [stdout]     |
[INFO] [stdout] 118 | impl TrafficLightColor {
[INFO] [stdout]     | ---------------------- method in this implementation
[INFO] [stdout] 119 |     fn color(&self) -> String {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `type_of` is never used
[INFO] [stdout]   --> src/basic_types/numbers.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn type_of<T>(_: &T) -> String {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task6` is never used
[INFO] [stdout]   --> src/basic_types/numbers.rs:58:8
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub fn task6() {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `type_of_variable` is never used
[INFO] [stdout]   --> src/basic_types/numbers.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn type_of_variable<T>(_: &T) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum` is never used
[INFO] [stdout]   --> src/basic_types/functions.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn sum(x: i32, y: i32) -> i32{
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print` is never used
[INFO] [stdout]   --> src/basic_types/functions.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn print() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `never_return_with_timeout` is never used
[INFO] [stdout]   --> src/basic_types/functions.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn never_return_with_timeout(seconds: u64) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_option` is never used
[INFO] [stdout]   --> src/basic_types/functions.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn get_option(tp: u8) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `never_return_fn` is never used
[INFO] [stdout]   --> src/basic_types/functions.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn never_return_fn() -> ! {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum` is never used
[INFO] [stdout]   --> src/basic_types/statements_expressions.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn sum(x: i32, y: i32) -> i32 {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_char` is never used
[INFO] [stdout]   --> src/basic_types/char_bool.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn print_char(c : char) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `implicitly_ret_unit` is never used
[INFO] [stdout]   --> src/basic_types/char_bool.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn implicitly_ret_unit() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `explicitly_ret_unit` is never used
[INFO] [stdout]   --> src/basic_types/char_bool.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn explicitly_ret_unit() -> () {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_letter` is never used
[INFO] [stdout]   --> src/compound_types/slice.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn first_letter(s: &str) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greetings` is never used
[INFO] [stdout]   --> src/compound_types/string.rs:73:4
[INFO] [stdout]    |
[INFO] [stdout] 73 | fn greetings(s: &str) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_multiply` is never used
[INFO] [stdout]   --> src/compound_types/tuple.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn sum_multiply(nums: (i32, i32)) -> (i32, i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task3` is never used
[INFO] [stdout]   --> src/compound_types/struct1.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn task3() {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task5` is never used
[INFO] [stdout]   --> src/compound_types/struct1.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub fn task5() {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_ownership` is never used
[INFO] [stdout]   --> src/ownership_borrowing/ownership.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn take_ownership(s: String)-> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `give_ownership` is never used
[INFO] [stdout]   --> src/ownership_borrowing/ownership.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn give_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_str` is never used
[INFO] [stdout]   --> src/ownership_borrowing/ownership.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn print_str(s: String)  {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `borrow_object` is never used
[INFO] [stdout]   --> src/ownership_borrowing/reference_borrowing.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn borrow_object(s: &String) {}
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `push_str` is never used
[INFO] [stdout]   --> src/ownership_borrowing/reference_borrowing.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn push_str(s: &mut String) {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_addr` is never used
[INFO] [stdout]   --> src/ownership_borrowing/reference_borrowing.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn get_addr(r: &char) -> String {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `borrow_object1` is never used
[INFO] [stdout]    --> src/ownership_borrowing/reference_borrowing.rs:114:4
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn borrow_object1(s: &mut String) {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `borrow_object2` is never used
[INFO] [stdout]    --> src/ownership_borrowing/reference_borrowing.rs:129:4
[INFO] [stdout]     |
[INFO] [stdout] 129 | fn borrow_object2(s: &String) {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Direction` is never used
[INFO] [stdout]  --> src/pattern_match/match1.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Direction {
[INFO] [stdout]   |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/pattern_match/match1.rs:39:6
[INFO] [stdout]    |
[INFO] [stdout] 39 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `show_message` is never used
[INFO] [stdout]   --> src/pattern_match/match1.rs:61:4
[INFO] [stdout]    |
[INFO] [stdout] 61 | fn show_message(msg: Message) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyEnum` is never used
[INFO] [stdout]   --> src/pattern_match/match1.rs:89:6
[INFO] [stdout]    |
[INFO] [stdout] 89 | enum MyEnum {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Foo1` is never used
[INFO] [stdout]    --> src/pattern_match/match1.rs:122:6
[INFO] [stdout]     |
[INFO] [stdout] 122 | enum Foo1 {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Foo` is never used
[INFO] [stdout]    --> src/pattern_match/match1.rs:139:6
[INFO] [stdout]     |
[INFO] [stdout] 139 | enum Foo {
[INFO] [stdout]     |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/pattern_match/patterns1.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Point {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/pattern_match/patterns1.rs:38:6
[INFO] [stdout]    |
[INFO] [stdout] 38 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `A` is never constructed
[INFO] [stdout]  --> src/generics_traits/generics.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct A;          // Concrete type `A`.
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]  --> src/generics_traits/generics.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct S(A);       // Concrete type `S`.
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SGen` is never constructed
[INFO] [stdout]  --> src/generics_traits/generics.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct SGen<T>(T); // Generic type `SGen`.
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reg_fn` is never used
[INFO] [stdout]  --> src/generics_traits/generics.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn reg_fn(_s: S) {}
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gen_spec_t` is never used
[INFO] [stdout]  --> src/generics_traits/generics.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn gen_spec_t(_s: SGen<A>) {}
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gen_spec_i32` is never used
[INFO] [stdout]   --> src/generics_traits/generics.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn gen_spec_i32(_s: SGen<i32>) {}
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generic` is never used
[INFO] [stdout]   --> src/generics_traits/generics.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn generic<T>(_s: SGen<T>) {}
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum` is never used
[INFO] [stdout]   --> src/generics_traits/generics.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn sum<T:std::ops::Add<Output = T>>(x: T, y: T) -> T {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point1` is never constructed
[INFO] [stdout]   --> src/generics_traits/generics.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct Point1<T> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point4` is never constructed
[INFO] [stdout]   --> src/generics_traits/generics.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | struct Point4<T, U> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Val` is never constructed
[INFO] [stdout]   --> src/generics_traits/generics.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | struct Val<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `value` is never used
[INFO] [stdout]   --> src/generics_traits/generics.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 69 | impl<T> Val<T> {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 70 |     fn value(&self) -> &T {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point3` is never constructed
[INFO] [stdout]   --> src/generics_traits/generics.rs:85:8
[INFO] [stdout]    |
[INFO] [stdout] 85 | struct Point3<T, U> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point2D` is never constructed
[INFO] [stdout]   --> src/generics_traits/generics.rs:90:8
[INFO] [stdout]    |
[INFO] [stdout] 90 | struct Point2D<T, U> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mixup` is never used
[INFO] [stdout]   --> src/generics_traits/generics.rs:97:8
[INFO] [stdout]    |
[INFO] [stdout] 95 | impl<T, U> Point2D<T, U> {
[INFO] [stdout]    | ------------------------ method in this implementation
[INFO] [stdout] 96 |     // Функція mixup, яка приймає Point2D<V, W> і повертає Point2D<T, W>
[INFO] [stdout] 97 |     fn mixup<V, W>(self, other: Point2D<V, W>) -> Point2D<T, W> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]    --> src/generics_traits/generics.rs:118:8
[INFO] [stdout]     |
[INFO] [stdout] 118 | struct Point<T> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `distance_from_origin` is never used
[INFO] [stdout]    --> src/generics_traits/generics.rs:124:8
[INFO] [stdout]     |
[INFO] [stdout] 123 | impl Point<f32> {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] 124 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Array` is never constructed
[INFO] [stdout]  --> src/generics_traits/const_generics.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Array<T, const N: usize> {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_array` is never used
[INFO] [stdout]   --> src/generics_traits/const_generics.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn print_array<T: std::fmt::Debug, const N: usize>(arr: [T; N]) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Hello` is never used
[INFO] [stdout]  --> src/generics_traits/traits.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | trait Hello {
[INFO] [stdout]   |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Student` is never constructed
[INFO] [stdout]   --> src/generics_traits/traits.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Student {}
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Teacher` is never constructed
[INFO] [stdout]   --> src/generics_traits/traits.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct Teacher {}
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Centimeters` is never constructed
[INFO] [stdout]   --> src/generics_traits/traits.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | struct Centimeters(f64);
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Inches` is never constructed
[INFO] [stdout]   --> src/generics_traits/traits.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Inches(i32);
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_centimeters` is never used
[INFO] [stdout]   --> src/generics_traits/traits.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | impl Inches {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] 47 |     fn to_centimeters(&self) -> Centimeters {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Seconds` is never constructed
[INFO] [stdout]   --> src/generics_traits/traits.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | struct Seconds(i32);
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multiply` is never used
[INFO] [stdout]   --> src/generics_traits/traits.rs:82:4
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn multiply<T: ops::Mul<Output = T>>(x: T, y: T) -> T {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Foo` is never constructed
[INFO] [stdout]   --> src/generics_traits/traits.rs:92:8
[INFO] [stdout]    |
[INFO] [stdout] 92 | struct Foo;
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Bar` is never constructed
[INFO] [stdout]   --> src/generics_traits/traits.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Bar;
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FooBar` is never constructed
[INFO] [stdout]   --> src/generics_traits/traits.rs:96:8
[INFO] [stdout]    |
[INFO] [stdout] 96 | struct FooBar;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BarFoo` is never constructed
[INFO] [stdout]   --> src/generics_traits/traits.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 | struct BarFoo;
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Summary` is never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:125:7
[INFO] [stdout]     |
[INFO] [stdout] 125 | trait Summary {
[INFO] [stdout]     |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Post` is never constructed
[INFO] [stdout]    --> src/generics_traits/traits.rs:130:8
[INFO] [stdout]     |
[INFO] [stdout] 130 | struct Post {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Weibo` is never constructed
[INFO] [stdout]    --> src/generics_traits/traits.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 143 | struct Weibo {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `summary` is never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:173:4
[INFO] [stdout]     |
[INFO] [stdout] 173 | fn summary(t: &impl Summary) {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Sheep` is never constructed
[INFO] [stdout]    --> src/generics_traits/traits.rs:177:8
[INFO] [stdout]     |
[INFO] [stdout] 177 | struct Sheep {}
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cow` is never constructed
[INFO] [stdout]    --> src/generics_traits/traits.rs:178:8
[INFO] [stdout]     |
[INFO] [stdout] 178 | struct Cow {}
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Animal` is never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:180:7
[INFO] [stdout]     |
[INFO] [stdout] 180 | trait Animal {
[INFO] [stdout]     |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `random_animal` is never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:198:4
[INFO] [stdout]     |
[INFO] [stdout] 198 | fn random_animal(random_number: f64) -> impl Animal {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum` is never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:221:4
[INFO] [stdout]     |
[INFO] [stdout] 221 | fn sum<T: std::ops::Add<Output = T>>(x: T, y: T) -> T {
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]    --> src/generics_traits/traits.rs:224:8
[INFO] [stdout]     |
[INFO] [stdout] 224 | struct Pair<T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:230:8
[INFO] [stdout]     |
[INFO] [stdout] 229 | impl<T> Pair<T> {
[INFO] [stdout]     | --------------- associated function in this implementation
[INFO] [stdout] 230 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `cmp_display` is never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:239:8
[INFO] [stdout]     |
[INFO] [stdout] 238 | impl<T: std::fmt::Debug + PartialOrd> Pair<T> {
[INFO] [stdout]     | --------------------------------------------- method in this implementation
[INFO] [stdout] 239 |     fn cmp_display(&self) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Unit` is never constructed
[INFO] [stdout]    --> src/generics_traits/traits.rs:249:8
[INFO] [stdout]     |
[INFO] [stdout] 249 | struct Unit(i32);
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example1` is never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:261:4
[INFO] [stdout]     |
[INFO] [stdout] 261 | fn example1() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:270:12
[INFO] [stdout]     |
[INFO] [stdout] 269 |     impl<T: Fn(u32) -> u32> Cacher<T> {
[INFO] [stdout]     |     --------------------------------- associated items in this implementation
[INFO] [stdout] 270 |         fn new(calculation: T) -> Cacher<T> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 277 |         fn value(&mut self, arg: u32) -> u32 {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example2` is never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:295:4
[INFO] [stdout]     |
[INFO] [stdout] 295 | fn example2() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:307:12
[INFO] [stdout]     |
[INFO] [stdout] 304 | /     impl<T> Cacher<T>
[INFO] [stdout] 305 | |         where T: Fn(u32) -> u32,
[INFO] [stdout]     | |________________________________- associated items in this implementation
[INFO] [stdout] 306 |       {
[INFO] [stdout] 307 |           fn new(calculation: T) -> Cacher<T> {
[INFO] [stdout]     |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 314 |           fn value(&mut self, arg: u32) -> u32 {
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Bird` is never used
[INFO] [stdout]  --> src/generics_traits/trait_object.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait Bird {
[INFO] [stdout]   |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Duck` is never constructed
[INFO] [stdout]  --> src/generics_traits/trait_object.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Duck;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `swim` is never used
[INFO] [stdout]  --> src/generics_traits/trait_object.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Duck {
[INFO] [stdout]   | --------- method in this implementation
[INFO] [stdout] 7 |     fn swim(&self) {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Swan` is never constructed
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Swan;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fly` is never used
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Swan {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 13 |     fn fly(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hatch_a_bird` is never used
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn hatch_a_bird(species: u8) ->Box<dyn Bird> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Bird1` is never used
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:57:7
[INFO] [stdout]    |
[INFO] [stdout] 57 | trait Bird1 {
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Duck1` is never constructed
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | struct Duck1;
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fly` is never used
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | impl Duck {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 63 |     fn fly(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Swan1` is never constructed
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 | struct Swan1;
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fly1` is never used
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 68 | impl Swan {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 69 |     fn fly1(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Draw` is never used
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:98:7
[INFO] [stdout]    |
[INFO] [stdout] 98 | trait Draw {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `draw_with_box` is never used
[INFO] [stdout]    --> src/generics_traits/trait_object.rs:126:4
[INFO] [stdout]     |
[INFO] [stdout] 126 | fn draw_with_box(x: Box<dyn Draw>) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `draw_with_ref` is never used
[INFO] [stdout]    --> src/generics_traits/trait_object.rs:130:4
[INFO] [stdout]     |
[INFO] [stdout] 130 | fn draw_with_ref(x: &dyn Draw) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Foo` is never used
[INFO] [stdout]    --> src/generics_traits/trait_object.rs:134:7
[INFO] [stdout]     |
[INFO] [stdout] 134 | trait Foo {
[INFO] [stdout]     |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `static_dispatch` is never used
[INFO] [stdout]    --> src/generics_traits/trait_object.rs:147:4
[INFO] [stdout]     |
[INFO] [stdout] 147 | fn static_dispatch<T: Foo>(x: T) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dynamic_dispatch` is never used
[INFO] [stdout]    --> src/generics_traits/trait_object.rs:152:4
[INFO] [stdout]     |
[INFO] [stdout] 152 | fn dynamic_dispatch(x: &dyn Foo) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `MyTrait` is never used
[INFO] [stdout]    --> src/generics_traits/trait_object.rs:167:7
[INFO] [stdout]     |
[INFO] [stdout] 167 | trait MyTrait {
[INFO] [stdout]     |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `my_function` is never used
[INFO] [stdout]    --> src/generics_traits/trait_object.rs:179:4
[INFO] [stdout]     |
[INFO] [stdout] 179 | fn my_function(x: impl MyTrait) -> impl MyTrait  {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Container` is never constructed
[INFO] [stdout]  --> src/generics_traits/advanced_traits.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Container(i32, i32);
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Contains` is never used
[INFO] [stdout]  --> src/generics_traits/advanced_traits.rs:7:7
[INFO] [stdout]   |
[INFO] [stdout] 7 | trait Contains {
[INFO] [stdout]   |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `difference` is never used
[INFO] [stdout]   --> src/generics_traits/advanced_traits.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn difference<C: Contains>(container: &C) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Pilot` is never used
[INFO] [stdout]   --> src/generics_traits/advanced_traits.rs:54:7
[INFO] [stdout]    |
[INFO] [stdout] 54 | trait Pilot {
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Wizard` is never used
[INFO] [stdout]   --> src/generics_traits/advanced_traits.rs:58:7
[INFO] [stdout]    |
[INFO] [stdout] 58 | trait Wizard {
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Human` is never constructed
[INFO] [stdout]   --> src/generics_traits/advanced_traits.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | struct Human;
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fly` is never used
[INFO] [stdout]   --> src/generics_traits/advanced_traits.rs:77:8
[INFO] [stdout]    |
[INFO] [stdout] 76 | impl Human {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] 77 |     fn fly(&self) -> String {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Person` is never used
[INFO] [stdout]   --> src/generics_traits/advanced_traits.rs:93:7
[INFO] [stdout]    |
[INFO] [stdout] 93 | trait Person {
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Student` is never used
[INFO] [stdout]   --> src/generics_traits/advanced_traits.rs:99:7
[INFO] [stdout]    |
[INFO] [stdout] 99 | trait Student: Person {
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Programmer` is never used
[INFO] [stdout]    --> src/generics_traits/advanced_traits.rs:103:7
[INFO] [stdout]     |
[INFO] [stdout] 103 | trait Programmer {
[INFO] [stdout]     |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `CompSciStudent` is never used
[INFO] [stdout]    --> src/generics_traits/advanced_traits.rs:109:7
[INFO] [stdout]     |
[INFO] [stdout] 109 | trait CompSciStudent: Programmer + Student {
[INFO] [stdout]     |       ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `comp_sci_student_greeting` is never used
[INFO] [stdout]    --> src/generics_traits/advanced_traits.rs:113:4
[INFO] [stdout]     |
[INFO] [stdout] 113 | fn comp_sci_student_greeting(student: &dyn CompSciStudent) -> String {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CSStudent` is never constructed
[INFO] [stdout]    --> src/generics_traits/advanced_traits.rs:123:8
[INFO] [stdout]     |
[INFO] [stdout] 123 | struct CSStudent {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pretty` is never constructed
[INFO] [stdout]    --> src/generics_traits/advanced_traits.rs:168:8
[INFO] [stdout]     |
[INFO] [stdout] 168 | struct Pretty(String);
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `move_ownership` is never used
[INFO] [stdout]   --> src/collection_types/string.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn move_ownership(s: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `borrow_string` is never used
[INFO] [stdout]   --> src/collection_types/string.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn borrow_string(s: &str) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_vec` is never used
[INFO] [stdout]   --> src/collection_types/vector.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn is_vec(v: &Vec<u8>) {}
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddr` is never used
[INFO] [stdout]    --> src/collection_types/vector.rs:147:6
[INFO] [stdout]     |
[INFO] [stdout] 147 | enum IpAddr {
[INFO] [stdout]     |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `random_stat_buff` is never used
[INFO] [stdout]   --> src/collection_types/hashmap.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn random_stat_buff() -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Viking` is never constructed
[INFO] [stdout]   --> src/collection_types/hashmap.rs:85:8
[INFO] [stdout]    |
[INFO] [stdout] 85 | struct Viking {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/collection_types/hashmap.rs:92:8
[INFO] [stdout]    |
[INFO] [stdout] 90 | impl Viking {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] 91 |     /// Creates a new Viking.
[INFO] [stdout] 92 |     fn new(name: &str, country: &str) -> Viking {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/compound_types/enum1.rs:94:9
[INFO] [stdout]    |
[INFO] [stdout] 94 | /         return
[INFO] [stdout] ...  |
[INFO] [stdout] 97 | |     panic!("NEVER LET THIS RUN！");
[INFO] [stdout]    | |     -----------------------------^
[INFO] [stdout]    | |_____|____________________________|
[INFO] [stdout]    |       |                            unreachable expression
[INFO] [stdout]    |       any code following this expression is unreachable
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]   --> src/variables.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let mut x: i32 = 1;
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/variables.rs:62:10
[INFO] [stdout]    |
[INFO] [stdout] 62 |      let x = x;
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/variables.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let y = 4;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/variables.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let y = "I can also be bound to text!";
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/variables.rs:92:13
[INFO] [stdout]    |
[INFO] [stdout] 92 |     let (x, y): (i32, i32);
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/flow_control.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     for name in &names {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/flow_control.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     for i in 0..=100 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/flow_control.rs:121:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |     for i in 0..=100 {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arr0`
[INFO] [stdout]   --> src/basic_types/array.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let arr0 = [1, 2, 3];
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_arr0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name0`
[INFO] [stdout]   --> src/basic_types/array.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let name0 = names.get(0).unwrap();
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_name0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `y` is assigned to, but never used
[INFO] [stdout]  --> src/basic_types/numbers.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut y: i32 = 5;
[INFO] [stdout]   |             ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_y` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]  --> src/basic_types/numbers.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     y = x;
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/basic_types/numbers.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let z = 10; // Type of z ?
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/basic_types/numbers.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let v: u16 = 38_u8 as u16;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/basic_types/numbers.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let y: f32 = 0.12; // f32
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/basic_types/numbers.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 |     let z = 0.01_f64; // f64
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/basic_types/char_bool.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let t = true;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/basic_types/char_bool.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let v = (2, 3);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]  --> src/compound_types/slice.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let s1: &[i32] = &arr[0..2];
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/compound_types/slice.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2: &str = "hello, world" ;
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/compound_types/string.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let s: &str = "hello, world";
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/compound_types/string.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let mut s = String::from("I like dogs");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> src/compound_types/string.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let s1: &str = &s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]  --> src/compound_types/tuple.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let t: (u8, u16, i64, &str, String) = (1u8, 2u16, 3i64, "hello", String::from(", world"));
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> src/compound_types/struct1.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let p = Person {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/compound_types/struct1.rs:38:31
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn do_something_with_unit(u: Unit) {}
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u2`
[INFO] [stdout]    --> src/compound_types/struct1.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |     let u2 = set_email(u1);
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_u2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg1`
[INFO] [stdout]   --> src/compound_types/enum1.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let msg1 = Message::Move{x: 1, y: 2}; // instantiating with x = 1, y = 2
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_msg1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `msg2`
[INFO] [stdout]   --> src/compound_types/enum1.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let msg2 = Message::Write(String::from("hello, world")); // instantiating with "hello, world!"
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_msg2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]   --> src/compound_types/enum1.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |     let none = plus_one(None);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ownership_borrowing/reference_borrowing.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut s = String::from("hello, ");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/ownership_borrowing/reference_borrowing.rs:34:18
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn borrow_object(s: &String) {}
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ownership_borrowing/reference_borrowing.rs:94:9
[INFO] [stdout]    |
[INFO] [stdout] 94 |     let mut s = String::from("hello");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/ownership_borrowing/reference_borrowing.rs:114:19
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn borrow_object1(s: &mut String) {}
[INFO] [stdout]     |                   ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/ownership_borrowing/reference_borrowing.rs:129:19
[INFO] [stdout]     |
[INFO] [stdout] 129 | fn borrow_object2(s: &String) {}
[INFO] [stdout]     |                   ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]    --> src/ownership_borrowing/reference_borrowing.rs:151:9
[INFO] [stdout]     |
[INFO] [stdout] 151 |     let r1 = &mut s;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]    --> src/ownership_borrowing/reference_borrowing.rs:152:9
[INFO] [stdout]     |
[INFO] [stdout] 152 |     let r2 = &mut s;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]   --> src/pattern_match/match1.rs:67:30
[INFO] [stdout]    |
[INFO] [stdout] 67 |         Message::ChangeColor(r, g, b) => {
[INFO] [stdout]    |                              ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> src/pattern_match/match1.rs:131:8
[INFO] [stdout]     |
[INFO] [stdout] 131 |     if let Foo1::Bar(i) = a  {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `integer`
[INFO] [stdout]   --> src/generics_traits/generics.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let integer = Point1 { x: 5, y: 10 };
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `float`
[INFO] [stdout]   --> src/generics_traits/generics.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     let float = Point1 { x: 1.0, y: 4.0 };
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arrays`
[INFO] [stdout]  --> src/generics_traits/const_generics.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let arrays = [
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_arrays`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/collection_types/vector.rs:28:11
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn is_vec(v: &Vec<u8>) {}
[INFO] [stdout]    |           ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `show_state` and `change_state` are never used
[INFO] [stdout]   --> src/method.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 48 | impl TrafficLight {
[INFO] [stdout]    | ----------------- methods in this implementation
[INFO] [stdout] 49 |     // using `Self` to fill in the blank
[INFO] [stdout] 50 |     pub fn show_state(self: &Self) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 55 |     pub fn change_state(&mut self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TrafficLight1` is never constructed
[INFO] [stdout]   --> src/method.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 | struct TrafficLight1 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/method.rs:89:8
[INFO] [stdout]    |
[INFO] [stdout] 89 | struct Rectangle {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `area` is never used
[INFO] [stdout]   --> src/method.rs:96:8
[INFO] [stdout]    |
[INFO] [stdout] 95 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 96 |     fn area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `can_hold` is never used
[INFO] [stdout]    --> src/method.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 101 | impl Rectangle {
[INFO] [stdout]     | -------------- method in this implementation
[INFO] [stdout] 102 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Red` and `Green` are never constructed
[INFO] [stdout]    --> src/method.rs:112:5
[INFO] [stdout]     |
[INFO] [stdout] 111 | enum TrafficLightColor {
[INFO] [stdout]     |      ----------------- variants in this enum
[INFO] [stdout] 112 |     Red,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 113 |     Yellow,
[INFO] [stdout] 114 |     Green,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `TrafficLightColor` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/basic_types/array.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task6` is never used
[INFO] [stdout]   --> src/basic_types/numbers.rs:58:8
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub fn task6() {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `type_of_variable` is never used
[INFO] [stdout]   --> src/basic_types/numbers.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn type_of_variable<T>(_: &T) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_option` is never used
[INFO] [stdout]   --> src/basic_types/functions.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn get_option(tp: u8) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `never_return_fn` is never used
[INFO] [stdout]   --> src/basic_types/functions.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn never_return_fn() -> ! {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `explicitly_ret_unit` is never used
[INFO] [stdout]   --> src/basic_types/char_bool.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn explicitly_ret_unit() -> () {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/compound_types/string.rs:57:4
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/compound_types/string.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name`, `age`, and `hobby` are never read
[INFO] [stdout]  --> src/compound_types/struct1.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Person {
[INFO] [stdout]   |        ------ fields in this struct
[INFO] [stdout] 6 |     name: String,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 7 |     age: u8,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 8 |     hobby: String
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Unit` is never constructed
[INFO] [stdout]   --> src/compound_types/struct1.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 |     struct Unit;
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `SomeTrait` is never used
[INFO] [stdout]   --> src/compound_types/struct1.rs:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 |     trait SomeTrait {
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/compound_types/struct1.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_something_with_unit` is never used
[INFO] [stdout]   --> src/compound_types/struct1.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn do_something_with_unit(u: Unit) {}
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task3` is never used
[INFO] [stdout]   --> src/compound_types/struct1.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | pub fn task3() {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `task5` is never used
[INFO] [stdout]   --> src/compound_types/struct1.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub fn task5() {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `active`, `username`, `email`, and `sign_in_count` are never read
[INFO] [stdout]    --> src/compound_types/struct1.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |     struct User {
[INFO] [stdout]     |            ---- fields in this struct
[INFO] [stdout] 102 |         active: bool,
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout] 103 |         username: String,
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 104 |         email: String,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 105 |         sign_in_count: u64,
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]    --> src/compound_types/struct1.rs:132:8
[INFO] [stdout]     |
[INFO] [stdout] 132 | struct Rectangle {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/compound_types/struct1.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn main() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `File` is never constructed
[INFO] [stdout]    --> src/compound_types/struct1.rs:155:8
[INFO] [stdout]     |
[INFO] [stdout] 155 | struct File {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/compound_types/struct1.rs:159:4
[INFO] [stdout]     |
[INFO] [stdout] 159 | fn main() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Zero` and `Two` are never constructed
[INFO] [stdout]  --> src/compound_types/enum1.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     enum Number {
[INFO] [stdout]   |          ------ variants in this enum
[INFO] [stdout] 6 |         Zero,
[INFO] [stdout]   |         ^^^^
[INFO] [stdout] 7 |         One,
[INFO] [stdout] 8 |         Two,
[INFO] [stdout]   |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Zero` and `Two` are never constructed
[INFO] [stdout]   --> src/compound_types/enum1.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     enum Number1 {
[INFO] [stdout]    |          ------- variants in this enum
[INFO] [stdout] 12 |         Zero = 0,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 13 |         One,
[INFO] [stdout] 14 |         Two,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Zero` and `Two` are never constructed
[INFO] [stdout]   --> src/compound_types/enum1.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     enum Number2 {
[INFO] [stdout]    |          ------- variants in this enum
[INFO] [stdout] 19 |         Zero = 0,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 20 |         One = 1,
[INFO] [stdout] 21 |         Two = 2,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/compound_types/enum1.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     Move { x: i32, y: i32 },
[INFO] [stdout]    |     ----   ^       ^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/compound_types/enum1.rs:35:11
[INFO] [stdout]    |
[INFO] [stdout] 35 |     Write(String),
[INFO] [stdout]    |     ----- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 35 -     Write(String),
[INFO] [stdout] 35 +     Write(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit` and `ChangeColor` are never constructed
[INFO] [stdout]   --> src/compound_types/enum1.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     enum Message {
[INFO] [stdout]    |          ------- variants in this enum
[INFO] [stdout] 33 |     Quit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `Write`, and `ChangeColor` are never constructed
[INFO] [stdout]   --> src/compound_types/enum1.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     enum Message {
[INFO] [stdout]    |          ------- variants in this enum
[INFO] [stdout] 45 |     Quit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 46 |     Move { x: i32, y: i32 },
[INFO] [stdout] 47 |     Write(String),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 48 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/compound_types/enum1.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 64 |     Move { x: i32, y: i32 },
[INFO] [stdout]    |     ----   ^       ^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]   --> src/compound_types/enum1.rs:66:17
[INFO] [stdout]    |
[INFO] [stdout] 66 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]    |     ----------- ^^^  ^^^  ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 66 -     ChangeColor(i32, i32, i32),
[INFO] [stdout] 66 +     ChangeColor((), (), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Write` is never constructed
[INFO] [stdout]   --> src/compound_types/enum1.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | enum Message {
[INFO] [stdout]    |      ------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 65 |     Write(String),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` 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 `East`, `West`, and `North` are never constructed
[INFO] [stdout]  --> src/pattern_match/match1.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Direction {
[INFO] [stdout]   |      --------- variants in this enum
[INFO] [stdout] 3 |     East,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 4 |     West,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 5 |     North,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Write` is never constructed
[INFO] [stdout]   --> src/pattern_match/match1.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | enum Message {
[INFO] [stdout]    |      ------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 42 |     Write(String),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/pattern_match/match1.rs:142:9
[INFO] [stdout]     |
[INFO] [stdout] 142 |     Qux(u32)
[INFO] [stdout]     |     --- ^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 142 -     Qux(u32)
[INFO] [stdout] 142 +     Qux(())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Bar` and `Baz` are never constructed
[INFO] [stdout]    --> src/pattern_match/match1.rs:140:5
[INFO] [stdout]     |
[INFO] [stdout] 139 | enum Foo {
[INFO] [stdout]     |      --- variants in this enum
[INFO] [stdout] 140 |     Bar,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 141 |     Baz,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_number` is never used
[INFO] [stdout]  --> src/pattern_match/patterns1.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 |     fn match_number(n: i32) {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/pattern_match/patterns1.rs:88:8
[INFO] [stdout]    |
[INFO] [stdout] 88 |     fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/generics_traits/generics.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct Point1<T> {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 40 |     x: T,
[INFO] [stdout]    |     ^
[INFO] [stdout] 41 |     y: T,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point3` is never constructed
[INFO] [stdout]   --> src/generics_traits/generics.rs:85:8
[INFO] [stdout]    |
[INFO] [stdout] 85 | struct Point3<T, U> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]  --> src/generics_traits/const_generics.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Array<T, const N: usize> {
[INFO] [stdout]   |        ----- field in this struct
[INFO] [stdout] 3 |     data : [T; N]
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]    --> src/generics_traits/traits.rs:133:5
[INFO] [stdout]     |
[INFO] [stdout] 130 | struct Post {
[INFO] [stdout]     |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 133 |     content: String,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Post` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cow` is never constructed
[INFO] [stdout]    --> src/generics_traits/traits.rs:178:8
[INFO] [stdout]     |
[INFO] [stdout] 178 | struct Cow {}
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/generics_traits/traits.rs:230:8
[INFO] [stdout]     |
[INFO] [stdout] 229 | impl<T> Pair<T> {
[INFO] [stdout]     | --------------- associated function in this implementation
[INFO] [stdout] 230 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fly` is never used
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Swan {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 13 |     fn fly(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fly` is never used
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | impl Duck {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 63 |     fn fly(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fly1` is never used
[INFO] [stdout]   --> src/generics_traits/trait_object.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 68 | impl Swan {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 69 |     fn fly1(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.39s
[INFO] running `Command { std: "docker" "inspect" "083cf9700f4135b2a04db7856a45e6f354dcf8551ac0ab6129f134c914e47d4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "083cf9700f4135b2a04db7856a45e6f354dcf8551ac0ab6129f134c914e47d4b", kill_on_drop: false }`
[INFO] [stdout] 083cf9700f4135b2a04db7856a45e6f354dcf8551ac0ab6129f134c914e47d4b