[INFO] fetching crate rusty_helloworld 0.1.0...
[INFO] building rusty_helloworld-0.1.0 against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] extracting crate rusty_helloworld 0.1.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate rusty_helloworld 0.1.0 on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rusty_helloworld 0.1.0
[INFO] finished tweaking crates.io crate rusty_helloworld 0.1.0
[INFO] tweaked toml for crates.io crate rusty_helloworld 0.1.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate crates.io crate rusty_helloworld 0.1.0 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ef391cf48827470ecbcbd77bb39d86d72f42e646361271517b1db99858d16f47
[INFO] running `Command { std: "docker" "start" "-a" "ef391cf48827470ecbcbd77bb39d86d72f42e646361271517b1db99858d16f47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ef391cf48827470ecbcbd77bb39d86d72f42e646361271517b1db99858d16f47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef391cf48827470ecbcbd77bb39d86d72f42e646361271517b1db99858d16f47", kill_on_drop: false }`
[INFO] [stdout] ef391cf48827470ecbcbd77bb39d86d72f42e646361271517b1db99858d16f47
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5bdd317ca307f85469022a91f031dc0587d7da15efe2d9cda7983eef87df104f
[INFO] running `Command { std: "docker" "start" "-a" "5bdd317ca307f85469022a91f031dc0587d7da15efe2d9cda7983eef87df104f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling unicode-segmentation v1.10.1
[INFO] [stderr]    Compiling colored v2.1.0
[INFO] [stderr]    Compiling getrandom v0.2.11
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling rusty_helloworld v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structure.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let black = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/lib.rs:178:16
[INFO] [stdout]     |
[INFO] [stdout] 178 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor{
[INFO] [stdout]     |                ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/lib.rs:178:34
[INFO] [stdout]     |
[INFO] [stdout] 178 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor{
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rusty` is never constructed
[INFO] [stdout]  --> src/structure.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Rusty{   // Start a struct name with capital
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `boo` and `check_rust` are never used
[INFO] [stdout]   --> src/structure.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Rusty{
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 13 |     fn boo(){
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn check_rust(&self){
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/structure.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub struct Rectangle{
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `calc` and `can_hold` are never used
[INFO] [stdout]   --> src/structure.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl Rectangle{
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 29 |     fn calc(&self) -> u32{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     pub fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `square` is never used
[INFO] [stdout]   --> src/structure.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl Rectangle{
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 40 |     fn square(size: u32) -> Rectangle{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/structure.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `next` is never used
[INFO] [stdout]  --> src/iters.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Iterator{
[INFO] [stdout]   |           -------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 4 |     fn next(&mut self) -> Option<Self::Item>;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shoes_in_my_size` is never used
[INFO] [stdout]   --> src/iters.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe>{
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/iters.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl Counter{
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] 23 |     pub fn new() -> Counter{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/iters.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::hash_map`
[INFO] [stdout]  --> src/collections.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::hash_map;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::Read`
[INFO] [stdout]  --> src/error_handling.rs:3:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{fs::*, io, io::Read};
[INFO] [stdout]   |                      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `result`
[INFO] [stdout]  --> src/lifetimes.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{result, fmt::Display};
[INFO] [stdout]   |           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `helloworld::hello`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use helloworld::hello;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/panic.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     panic!("Oh no!!\nI panicked!!!");   // panic violently stops execution of code.
[INFO] [stdout]    |     -------------------------------- any code following this expression is unreachable
[INFO] [stdout] 27 |
[INFO] [stdout] 28 |     let o1: std::option::Option<i32> = Some(128);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/helloworld.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let a = 98_322; // decimal
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/helloworld.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let b = 0xff;   // hex
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/helloworld.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let c = 0o77;   // octal
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/helloworld.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let d = 0b1111_0000;    // binary
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/helloworld.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let e = b'A';   // byte(u8 only)
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/helloworld.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let f = 2.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]   --> src/helloworld.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let g: f32 = 3.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/helloworld.rs:40:10
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let (string, num, truth) = tup; // To extract value from a tuple
[INFO] [stdout]    |          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/helloworld.rs:40:18
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let (string, num, truth) = tup; // To extract value from a tuple
[INFO] [stdout]    |                  ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `truth`
[INFO] [stdout]   --> src/helloworld.rs:40:23
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let (string, num, truth) = tup; // To extract value from a tuple
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_truth`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/helloworld.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let string = tup.0;  // another way
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lst`
[INFO] [stdout]   --> src/helloworld.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let lst = [100, 200, 300];
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_lst`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `byte`
[INFO] [stdout]   --> src/helloworld.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let byte = [0;8];   // this generates 8 "0" values in a list
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/helloworld.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |     let mut v1 = vec![true, false];
[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: `s5`
[INFO] [stdout]   --> src/ownership.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let s5 = take_ownership_ref(&s4);
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s5`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/ownership.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let r1 = & s6;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r3`
[INFO] [stdout]   --> src/ownership.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let r3 = &mut s6;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structure.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let black = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/panic.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let s = str::from_utf8(&[195, 40]).expect("Valid utf-8");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `localhost`
[INFO] [stdout]   --> src/enums.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let localhost = IpAddrKind::V4(128, 0, 0, 1);
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_localhost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_str`
[INFO] [stdout]   --> src/enums.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let some_str = Some("some string");
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `no_num`
[INFO] [stdout]   --> src/enums.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let no_num: Option<i32> = None;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_no_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/enums.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let sum = x + y.unwrap_or(0);    // Unwrap can be of many types, the "unwrap_or" means either the value of y if exists or the default...
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> src/collections.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let a = [1, 2, 3];
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `third_val`
[INFO] [stdout]   --> src/collections.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let third_val = &v2[2];
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_third_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> src/collections.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let s3 = String::from("Hello Rust");
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s4`
[INFO] [stdout]   --> src/collections.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let s4 = s2.to_string();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/collections.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let s = format!("{} {}", s1, s2);   // this doesn't take ownership of the variables
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `val`
[INFO] [stdout]    --> src/collections.rs:103:9
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let val = hash_map.get(&hash_val);  // Option<&i32> type because there is no guarantee of an element existing with that key.
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let f = match f {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let f = File::open("Hello.txt").unwrap_or_else(|error | {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let f = File::open("Hello.txt")?;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]   --> src/generic.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let p1 = Point {x: 1, y: 2};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/generic.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let p2 = Point {x: 1.0, y: 2.0};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/traits.rs:76:24
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/traits.rs:76:31
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/lifetimes.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let i = ImportantExcerpt{
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/helloworld.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn main(){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello` is never used
[INFO] [stdout]  --> src/helloworld.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub fn hello(){
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gen_random` is never used
[INFO] [stdout]  --> src/random_num.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn gen_random() -> u32 {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_input` is never used
[INFO] [stdout]   --> src/random_num.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn take_input() -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `random_num` is never used
[INFO] [stdout]   --> src/random_num.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn random_num() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_fn` is never used
[INFO] [stdout]  --> src/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn ownership_fn(){
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]   --> src/ownership.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn change(str:&mut String){
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn take_ownership(str:String) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_ownership_ref` is never used
[INFO] [stdout]   --> src/ownership.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn take_ownership_ref(str: &String){
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `give_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:82:4
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn give_ownership(str:String) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_and_give_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn take_and_give_ownership(str:String) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rusty` is never constructed
[INFO] [stdout]  --> src/structure.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Rusty{   // Start a struct name with capital
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `boo` and `check_rust` are never used
[INFO] [stdout]   --> src/structure.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Rusty{
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 13 |     fn boo(){
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn check_rust(&self){
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/structure.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub struct Rectangle{
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `calc` and `can_hold` are never used
[INFO] [stdout]   --> src/structure.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl Rectangle{
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 29 |     fn calc(&self) -> u32{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     pub fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `square` is never used
[INFO] [stdout]   --> src/structure.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl Rectangle{
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 40 |     fn square(size: u32) -> Rectangle{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/structure.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Option` is never used
[INFO] [stdout]  --> src/panic.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Option<T> {
[INFO] [stdout]   |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `unwrap` is never used
[INFO] [stdout]   --> src/panic.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl<T> Option<T> {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] 10 |     fn unwrap(self) -> T {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Result` is never used
[INFO] [stdout]   --> src/panic.rs:18:6
[INFO] [stdout]    |
[INFO] [stdout] 18 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/panic.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind` is never used
[INFO] [stdout]  --> src/enums.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum IpAddrKind{
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddr` is never constructed
[INFO] [stdout]  --> src/enums.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct IpAddr{
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/enums.rs:11:6
[INFO] [stdout]    |
[INFO] [stdout] 11 | enum Message{
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `some_fn` is never used
[INFO] [stdout]   --> src/enums.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl Message{
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] 20 |     fn some_fn(){
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/enums.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> src/enums.rs:55:6
[INFO] [stdout]    |
[INFO] [stdout] 55 | enum Coin{
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]   --> src/enums.rs:62:6
[INFO] [stdout]    |
[INFO] [stdout] 62 | enum UsState{
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `value_in_cents` is never used
[INFO] [stdout]   --> src/enums.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn value_in_cents(coin: Coin) -> u8{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/collections.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn main(){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/error_handling.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn main(){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username` is never used
[INFO] [stdout]   --> src/error_handling.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn read_username() -> Result<String, io::Error>{
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main_updated` is never used
[INFO] [stdout]   --> src/error_handling.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn main_updated() -> Result<(), Box<dyn Error>>{
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/generic.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Point<T, U>{
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mix` is never used
[INFO] [stdout]  --> src/generic.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl<T, U> Point<T, U> {
[INFO] [stdout]   | ---------------------- method in this implementation
[INFO] [stdout] 8 |     fn mix<V, W>(self, other: Point<V, W>) -> Point<T, W>{
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Option` is never used
[INFO] [stdout]   --> src/generic.rs:19:6
[INFO] [stdout]    |
[INFO] [stdout] 19 | enum Option<T> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Result` is never used
[INFO] [stdout]   --> src/generic.rs:24:6
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum Result<T, E>{
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/generic.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_gen` is never used
[INFO] [stdout]   --> src/generic.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn largest_gen<T: PartialOrd + Copy>(lst: Vec<T>) -> T {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `headline` and `content` are never read
[INFO] [stdout]   --> src/traits.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct NewsArticle{
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 12 |     pub author: String,
[INFO] [stdout] 13 |     pub headline: String,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 14 |     pub content: String
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/traits.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Tweet{
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 21 |     pub retweet: bool
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `summarize` and `summarize_author` are never used
[INFO] [stdout]   --> src/traits.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub trait Summary{
[INFO] [stdout]    |           ------- methods in this trait
[INFO] [stdout] 25 |     fn summarize(&self) -> String{
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     fn summarize_author(&self) -> String;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/traits.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub fn notify<T: Summary>(item1: &T, item2: &T){    // Can make sure both the parameters have the same type
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function` is never used
[INFO] [stdout]   --> src/traits.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_summarizable` is never used
[INFO] [stdout]   --> src/traits.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn returns_summarizable() -> impl Summary{  // returns a value that implements Summary
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]   --> src/traits.rs:94:8
[INFO] [stdout]    |
[INFO] [stdout] 94 | struct Pair<T>{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/traits.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout] 100 | impl<T> Pair<T>{
[INFO] [stdout]     | --------------- associated function in this implementation
[INFO] [stdout] 101 |     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/traits.rs:106:8
[INFO] [stdout]     |
[INFO] [stdout] 105 | impl<T: Display + PartialOrd> Pair<T>{
[INFO] [stdout]     | ------------------------------------- method in this implementation
[INFO] [stdout] 106 |     fn cmp_display(&self){
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/traits.rs:117:8
[INFO] [stdout]     |
[INFO] [stdout] 117 | pub fn main(){
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/lifetimes.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct ImportantExcerpt<'a>{
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `announce_and_return_part` is never used
[INFO] [stdout]   --> src/lifetimes.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl<'a> ImportantExcerpt<'a>{
[INFO] [stdout]    | ----------------------------- method in this implementation
[INFO] [stdout] 11 | fn announce_and_return_part(&self, announcement: &str) -> &str{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/lifetimes.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/lifetimes.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str{  // this makes sure that every value returned will have the same lifetime as "'a", whi...
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_announcement` is never used
[INFO] [stdout]   --> src/lifetimes.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn longest_with_announcement<'a, T>(x: &'a str, y: &'a str, announce: T) -> &'a str where T:Display{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `simulated_expensive_calc` is never used
[INFO] [stdout]  --> src/closures.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn simulated_expensive_calc(intensity: u32) -> u32{
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generate_workout` is never used
[INFO] [stdout]   --> src/closures.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn generate_workout(intensity: u32, random_num: u32){
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]   --> src/closures.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Cacher<T> where T: Fn(u32) -> u32,{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/closures.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | impl<T> Cacher<T> where T:Fn(u32) -> u32,{
[INFO] [stdout]    | ----------------------------------------- associated items in this implementation
[INFO] [stdout] 43 |     fn new(calculation: T) -> Cacher<T>{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     fn value(&mut self, arg: u32) -> u32{
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/closures.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `next` is never used
[INFO] [stdout]  --> src/iters.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Iterator{
[INFO] [stdout]   |           -------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 4 |     fn next(&mut self) -> Option<Self::Item>;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shoes_in_my_size` is never used
[INFO] [stdout]   --> src/iters.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe>{
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/iters.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl Counter{
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] 23 |     pub fn new() -> Counter{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/iters.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::str::from_utf8` with a invalid literal always return an error
[INFO] [stdout]   --> src/panic.rs:36:13
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let s = str::from_utf8(&[195, 40]).expect("Valid utf-8");
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^---------^
[INFO] [stdout]    |                             |
[INFO] [stdout]    |                             the literal was valid UTF-8 up to the 0 bytes
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(invalid_from_utf8)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/error_handling.rs:67:5
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fs::read_to_string("Hello.txt");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let _ = fs::read_to_string("Hello.txt");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/error_handling.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 71 |     main_updated();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 71 |     let _ = main_updated();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.31s
[INFO] running `Command { std: "docker" "inspect" "5bdd317ca307f85469022a91f031dc0587d7da15efe2d9cda7983eef87df104f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bdd317ca307f85469022a91f031dc0587d7da15efe2d9cda7983eef87df104f", kill_on_drop: false }`
[INFO] [stdout] 5bdd317ca307f85469022a91f031dc0587d7da15efe2d9cda7983eef87df104f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a35e0f5b0435c600bb7d66b33d38c3a5bbedac49a855d5b8e39680c1e95b8690
[INFO] running `Command { std: "docker" "start" "-a" "a35e0f5b0435c600bb7d66b33d38c3a5bbedac49a855d5b8e39680c1e95b8690", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structure.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let black = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/lib.rs:178:16
[INFO] [stdout]     |
[INFO] [stdout] 178 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor{
[INFO] [stdout]     |                ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/lib.rs:178:34
[INFO] [stdout]     |
[INFO] [stdout] 178 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor{
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rusty` is never constructed
[INFO] [stdout]  --> src/structure.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Rusty{   // Start a struct name with capital
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `boo` and `check_rust` are never used
[INFO] [stdout]   --> src/structure.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Rusty{
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 13 |     fn boo(){
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn check_rust(&self){
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/structure.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub struct Rectangle{
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `calc` and `can_hold` are never used
[INFO] [stdout]   --> src/structure.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl Rectangle{
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 29 |     fn calc(&self) -> u32{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     pub fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `square` is never used
[INFO] [stdout]   --> src/structure.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl Rectangle{
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 40 |     fn square(size: u32) -> Rectangle{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/structure.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `next` is never used
[INFO] [stdout]  --> src/iters.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Iterator{
[INFO] [stdout]   |           -------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 4 |     fn next(&mut self) -> Option<Self::Item>;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shoes_in_my_size` is never used
[INFO] [stdout]   --> src/iters.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe>{
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/iters.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl Counter{
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] 23 |     pub fn new() -> Counter{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/iters.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rusty_helloworld v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::hash_map`
[INFO] [stdout]  --> src/collections.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::hash_map;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::Read`
[INFO] [stdout]  --> src/error_handling.rs:3:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{fs::*, io, io::Read};
[INFO] [stdout]   |                      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `result`
[INFO] [stdout]  --> src/lifetimes.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{result, fmt::Display};
[INFO] [stdout]   |           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `helloworld::hello`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use helloworld::hello;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/panic.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     panic!("Oh no!!\nI panicked!!!");   // panic violently stops execution of code.
[INFO] [stdout]    |     -------------------------------- any code following this expression is unreachable
[INFO] [stdout] 27 |
[INFO] [stdout] 28 |     let o1: std::option::Option<i32> = Some(128);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/helloworld.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let a = 98_322; // decimal
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/helloworld.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let b = 0xff;   // hex
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/helloworld.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let c = 0o77;   // octal
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/helloworld.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let d = 0b1111_0000;    // binary
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/helloworld.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let e = b'A';   // byte(u8 only)
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/helloworld.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let f = 2.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]   --> src/helloworld.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let g: f32 = 3.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/helloworld.rs:40:10
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let (string, num, truth) = tup; // To extract value from a tuple
[INFO] [stdout]    |          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/helloworld.rs:40:18
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let (string, num, truth) = tup; // To extract value from a tuple
[INFO] [stdout]    |                  ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `truth`
[INFO] [stdout]   --> src/helloworld.rs:40:23
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let (string, num, truth) = tup; // To extract value from a tuple
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_truth`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/helloworld.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let string = tup.0;  // another way
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lst`
[INFO] [stdout]   --> src/helloworld.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let lst = [100, 200, 300];
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_lst`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `byte`
[INFO] [stdout]   --> src/helloworld.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let byte = [0;8];   // this generates 8 "0" values in a list
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/helloworld.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |     let mut v1 = vec![true, false];
[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: `s5`
[INFO] [stdout]   --> src/ownership.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let s5 = take_ownership_ref(&s4);
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s5`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/ownership.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let r1 = & s6;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r3`
[INFO] [stdout]   --> src/ownership.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let r3 = &mut s6;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structure.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let black = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/panic.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let s = str::from_utf8(&[195, 40]).expect("Valid utf-8");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `localhost`
[INFO] [stdout]   --> src/enums.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let localhost = IpAddrKind::V4(128, 0, 0, 1);
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_localhost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_str`
[INFO] [stdout]   --> src/enums.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let some_str = Some("some string");
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `no_num`
[INFO] [stdout]   --> src/enums.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let no_num: Option<i32> = None;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_no_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/enums.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let sum = x + y.unwrap_or(0);    // Unwrap can be of many types, the "unwrap_or" means either the value of y if exists or the default...
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> src/collections.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let a = [1, 2, 3];
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `third_val`
[INFO] [stdout]   --> src/collections.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let third_val = &v2[2];
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_third_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> src/collections.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let s3 = String::from("Hello Rust");
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s4`
[INFO] [stdout]   --> src/collections.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let s4 = s2.to_string();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/collections.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let s = format!("{} {}", s1, s2);   // this doesn't take ownership of the variables
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `val`
[INFO] [stdout]    --> src/collections.rs:103:9
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let val = hash_map.get(&hash_val);  // Option<&i32> type because there is no guarantee of an element existing with that key.
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let f = match f {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let f = File::open("Hello.txt").unwrap_or_else(|error | {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let f = File::open("Hello.txt")?;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]   --> src/generic.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let p1 = Point {x: 1, y: 2};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/generic.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let p2 = Point {x: 1.0, y: 2.0};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/traits.rs:76:24
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/traits.rs:76:31
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/lifetimes.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let i = ImportantExcerpt{
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/helloworld.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn main(){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello` is never used
[INFO] [stdout]  --> src/helloworld.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub fn hello(){
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gen_random` is never used
[INFO] [stdout]  --> src/random_num.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn gen_random() -> u32 {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_input` is never used
[INFO] [stdout]   --> src/random_num.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn take_input() -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `random_num` is never used
[INFO] [stdout]   --> src/random_num.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn random_num() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_fn` is never used
[INFO] [stdout]  --> src/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn ownership_fn(){
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]   --> src/ownership.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn change(str:&mut String){
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn take_ownership(str:String) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_ownership_ref` is never used
[INFO] [stdout]   --> src/ownership.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn take_ownership_ref(str: &String){
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `give_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:82:4
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn give_ownership(str:String) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_and_give_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn take_and_give_ownership(str:String) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rusty` is never constructed
[INFO] [stdout]  --> src/structure.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Rusty{   // Start a struct name with capital
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `boo` and `check_rust` are never used
[INFO] [stdout]   --> src/structure.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Rusty{
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 13 |     fn boo(){
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn check_rust(&self){
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/structure.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub struct Rectangle{
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `calc` and `can_hold` are never used
[INFO] [stdout]   --> src/structure.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl Rectangle{
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 29 |     fn calc(&self) -> u32{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     pub fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `square` is never used
[INFO] [stdout]   --> src/structure.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl Rectangle{
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 40 |     fn square(size: u32) -> Rectangle{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/structure.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Option` is never used
[INFO] [stdout]  --> src/panic.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Option<T> {
[INFO] [stdout]   |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `unwrap` is never used
[INFO] [stdout]   --> src/panic.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl<T> Option<T> {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] 10 |     fn unwrap(self) -> T {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Result` is never used
[INFO] [stdout]   --> src/panic.rs:18:6
[INFO] [stdout]    |
[INFO] [stdout] 18 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/panic.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind` is never used
[INFO] [stdout]  --> src/enums.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum IpAddrKind{
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddr` is never constructed
[INFO] [stdout]  --> src/enums.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct IpAddr{
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/enums.rs:11:6
[INFO] [stdout]    |
[INFO] [stdout] 11 | enum Message{
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `some_fn` is never used
[INFO] [stdout]   --> src/enums.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl Message{
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] 20 |     fn some_fn(){
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/enums.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> src/enums.rs:55:6
[INFO] [stdout]    |
[INFO] [stdout] 55 | enum Coin{
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]   --> src/enums.rs:62:6
[INFO] [stdout]    |
[INFO] [stdout] 62 | enum UsState{
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `value_in_cents` is never used
[INFO] [stdout]   --> src/enums.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn value_in_cents(coin: Coin) -> u8{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/collections.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn main(){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/error_handling.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn main(){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username` is never used
[INFO] [stdout]   --> src/error_handling.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn read_username() -> Result<String, io::Error>{
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main_updated` is never used
[INFO] [stdout]   --> src/error_handling.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn main_updated() -> Result<(), Box<dyn Error>>{
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/generic.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Point<T, U>{
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mix` is never used
[INFO] [stdout]  --> src/generic.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl<T, U> Point<T, U> {
[INFO] [stdout]   | ---------------------- method in this implementation
[INFO] [stdout] 8 |     fn mix<V, W>(self, other: Point<V, W>) -> Point<T, W>{
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Option` is never used
[INFO] [stdout]   --> src/generic.rs:19:6
[INFO] [stdout]    |
[INFO] [stdout] 19 | enum Option<T> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Result` is never used
[INFO] [stdout]   --> src/generic.rs:24:6
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum Result<T, E>{
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/generic.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_gen` is never used
[INFO] [stdout]   --> src/generic.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn largest_gen<T: PartialOrd + Copy>(lst: Vec<T>) -> T {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `headline` and `content` are never read
[INFO] [stdout]   --> src/traits.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct NewsArticle{
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 12 |     pub author: String,
[INFO] [stdout] 13 |     pub headline: String,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 14 |     pub content: String
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/traits.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Tweet{
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 21 |     pub retweet: bool
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `summarize` and `summarize_author` are never used
[INFO] [stdout]   --> src/traits.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub trait Summary{
[INFO] [stdout]    |           ------- methods in this trait
[INFO] [stdout] 25 |     fn summarize(&self) -> String{
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     fn summarize_author(&self) -> String;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/traits.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub fn notify<T: Summary>(item1: &T, item2: &T){    // Can make sure both the parameters have the same type
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function` is never used
[INFO] [stdout]   --> src/traits.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_summarizable` is never used
[INFO] [stdout]   --> src/traits.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn returns_summarizable() -> impl Summary{  // returns a value that implements Summary
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]   --> src/traits.rs:94:8
[INFO] [stdout]    |
[INFO] [stdout] 94 | struct Pair<T>{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/traits.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout] 100 | impl<T> Pair<T>{
[INFO] [stdout]     | --------------- associated function in this implementation
[INFO] [stdout] 101 |     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/traits.rs:106:8
[INFO] [stdout]     |
[INFO] [stdout] 105 | impl<T: Display + PartialOrd> Pair<T>{
[INFO] [stdout]     | ------------------------------------- method in this implementation
[INFO] [stdout] 106 |     fn cmp_display(&self){
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/traits.rs:117:8
[INFO] [stdout]     |
[INFO] [stdout] 117 | pub fn main(){
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/lifetimes.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct ImportantExcerpt<'a>{
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `announce_and_return_part` is never used
[INFO] [stdout]   --> src/lifetimes.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl<'a> ImportantExcerpt<'a>{
[INFO] [stdout]    | ----------------------------- method in this implementation
[INFO] [stdout] 11 | fn announce_and_return_part(&self, announcement: &str) -> &str{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/lifetimes.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/lifetimes.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str{  // this makes sure that every value returned will have the same lifetime as "'a", whi...
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_announcement` is never used
[INFO] [stdout]   --> src/lifetimes.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn longest_with_announcement<'a, T>(x: &'a str, y: &'a str, announce: T) -> &'a str where T:Display{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `simulated_expensive_calc` is never used
[INFO] [stdout]  --> src/closures.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn simulated_expensive_calc(intensity: u32) -> u32{
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generate_workout` is never used
[INFO] [stdout]   --> src/closures.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn generate_workout(intensity: u32, random_num: u32){
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]   --> src/closures.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Cacher<T> where T: Fn(u32) -> u32,{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/closures.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | impl<T> Cacher<T> where T:Fn(u32) -> u32,{
[INFO] [stdout]    | ----------------------------------------- associated items in this implementation
[INFO] [stdout] 43 |     fn new(calculation: T) -> Cacher<T>{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     fn value(&mut self, arg: u32) -> u32{
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/closures.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `next` is never used
[INFO] [stdout]  --> src/iters.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Iterator{
[INFO] [stdout]   |           -------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 4 |     fn next(&mut self) -> Option<Self::Item>;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shoes_in_my_size` is never used
[INFO] [stdout]   --> src/iters.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe>{
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/iters.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl Counter{
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] 23 |     pub fn new() -> Counter{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/iters.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::str::from_utf8` with a invalid literal always return an error
[INFO] [stdout]   --> src/panic.rs:36:13
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let s = str::from_utf8(&[195, 40]).expect("Valid utf-8");
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^---------^
[INFO] [stdout]    |                             |
[INFO] [stdout]    |                             the literal was valid UTF-8 up to the 0 bytes
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(invalid_from_utf8)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/error_handling.rs:67:5
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fs::read_to_string("Hello.txt");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let _ = fs::read_to_string("Hello.txt");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/error_handling.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 71 |     main_updated();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 71 |     let _ = main_updated();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::hash_map`
[INFO] [stdout]  --> src/collections.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::hash_map;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::Read`
[INFO] [stdout]  --> src/error_handling.rs:3:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{fs::*, io, io::Read};
[INFO] [stdout]   |                      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `result`
[INFO] [stdout]  --> src/lifetimes.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{result, fmt::Display};
[INFO] [stdout]   |           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `helloworld::hello`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use helloworld::hello;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structure.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let black = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/panic.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     panic!("Oh no!!\nI panicked!!!");   // panic violently stops execution of code.
[INFO] [stdout]    |     -------------------------------- any code following this expression is unreachable
[INFO] [stdout] 27 |
[INFO] [stdout] 28 |     let o1: std::option::Option<i32> = Some(128);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/lib.rs:178:16
[INFO] [stdout]     |
[INFO] [stdout] 178 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor{
[INFO] [stdout]     |                ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/lib.rs:178:34
[INFO] [stdout]     |
[INFO] [stdout] 178 |     pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor{
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rusty` is never constructed
[INFO] [stdout]  --> src/structure.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Rusty{   // Start a struct name with capital
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `boo` and `check_rust` are never used
[INFO] [stdout]   --> src/structure.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Rusty{
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 13 |     fn boo(){
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn check_rust(&self){
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `calc` is never used
[INFO] [stdout]   --> src/structure.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl Rectangle{
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 29 |     fn calc(&self) -> u32{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `square` is never used
[INFO] [stdout]   --> src/structure.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl Rectangle{
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 40 |     fn square(size: u32) -> Rectangle{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/structure.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/iters.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `Iterator_demons` should have a snake case name
[INFO] [stdout]   --> src/lib.rs:76:8
[INFO] [stdout]    |
[INFO] [stdout] 76 |     fn Iterator_demons(){
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator_demons`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/helloworld.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let a = 98_322; // decimal
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/helloworld.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let b = 0xff;   // hex
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/helloworld.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let c = 0o77;   // octal
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/helloworld.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let d = 0b1111_0000;    // binary
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/helloworld.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let e = b'A';   // byte(u8 only)
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/helloworld.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let f = 2.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]   --> src/helloworld.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let g: f32 = 3.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/helloworld.rs:40:10
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let (string, num, truth) = tup; // To extract value from a tuple
[INFO] [stdout]    |          ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/helloworld.rs:40:18
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let (string, num, truth) = tup; // To extract value from a tuple
[INFO] [stdout]    |                  ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `truth`
[INFO] [stdout]   --> src/helloworld.rs:40:23
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let (string, num, truth) = tup; // To extract value from a tuple
[INFO] [stdout]    |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_truth`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/helloworld.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let string = tup.0;  // another way
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lst`
[INFO] [stdout]   --> src/helloworld.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let lst = [100, 200, 300];
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_lst`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `byte`
[INFO] [stdout]   --> src/helloworld.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let byte = [0;8];   // this generates 8 "0" values in a list
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/helloworld.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |     let mut v1 = vec![true, false];
[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: `s5`
[INFO] [stdout]   --> src/ownership.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let s5 = take_ownership_ref(&s4);
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s5`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/ownership.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let r1 = & s6;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r3`
[INFO] [stdout]   --> src/ownership.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let r3 = &mut s6;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structure.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let black = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/panic.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let s = str::from_utf8(&[195, 40]).expect("Valid utf-8");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `localhost`
[INFO] [stdout]   --> src/enums.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let localhost = IpAddrKind::V4(128, 0, 0, 1);
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_localhost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_str`
[INFO] [stdout]   --> src/enums.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let some_str = Some("some string");
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `no_num`
[INFO] [stdout]   --> src/enums.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let no_num: Option<i32> = None;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_no_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/enums.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let sum = x + y.unwrap_or(0);    // Unwrap can be of many types, the "unwrap_or" means either the value of y if exists or the default...
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> src/collections.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let a = [1, 2, 3];
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `third_val`
[INFO] [stdout]   --> src/collections.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let third_val = &v2[2];
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_third_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> src/collections.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let s3 = String::from("Hello Rust");
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s4`
[INFO] [stdout]   --> src/collections.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let s4 = s2.to_string();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/collections.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let s = format!("{} {}", s1, s2);   // this doesn't take ownership of the variables
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `val`
[INFO] [stdout]    --> src/collections.rs:103:9
[INFO] [stdout]     |
[INFO] [stdout] 103 |     let val = hash_map.get(&hash_val);  // Option<&i32> type because there is no guarantee of an element existing with that key.
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_val`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let f = match f {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let f = File::open("Hello.txt").unwrap_or_else(|error | {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let f = File::open("Hello.txt")?;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p1`
[INFO] [stdout]   --> src/generic.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let p1 = Point {x: 1, y: 2};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_p1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p2`
[INFO] [stdout]   --> src/generic.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let p2 = Point {x: 1.0, y: 2.0};
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_p2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/traits.rs:76:24
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/traits.rs:76:31
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/lifetimes.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let i = ImportantExcerpt{
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/helloworld.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn main(){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello` is never used
[INFO] [stdout]  --> src/helloworld.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub fn hello(){
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gen_random` is never used
[INFO] [stdout]  --> src/random_num.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn gen_random() -> u32 {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_input` is never used
[INFO] [stdout]   --> src/random_num.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn take_input() -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `random_num` is never used
[INFO] [stdout]   --> src/random_num.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn random_num() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_fn` is never used
[INFO] [stdout]  --> src/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn ownership_fn(){
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]   --> src/ownership.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn change(str:&mut String){
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn take_ownership(str:String) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_ownership_ref` is never used
[INFO] [stdout]   --> src/ownership.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn take_ownership_ref(str: &String){
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `give_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:82:4
[INFO] [stdout]    |
[INFO] [stdout] 82 | fn give_ownership(str:String) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_and_give_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn take_and_give_ownership(str:String) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rusty` is never constructed
[INFO] [stdout]  --> src/structure.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Rusty{   // Start a struct name with capital
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `boo` and `check_rust` are never used
[INFO] [stdout]   --> src/structure.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Rusty{
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 13 |     fn boo(){
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn check_rust(&self){
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/structure.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub struct Rectangle{
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `calc` and `can_hold` are never used
[INFO] [stdout]   --> src/structure.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl Rectangle{
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 29 |     fn calc(&self) -> u32{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     pub fn can_hold(&self, other: &Rectangle) -> bool{
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `square` is never used
[INFO] [stdout]   --> src/structure.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | impl Rectangle{
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 40 |     fn square(size: u32) -> Rectangle{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/structure.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Option` is never used
[INFO] [stdout]  --> src/panic.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Option<T> {
[INFO] [stdout]   |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `unwrap` is never used
[INFO] [stdout]   --> src/panic.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 9  | impl<T> Option<T> {
[INFO] [stdout]    | ----------------- method in this implementation
[INFO] [stdout] 10 |     fn unwrap(self) -> T {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Result` is never used
[INFO] [stdout]   --> src/panic.rs:18:6
[INFO] [stdout]    |
[INFO] [stdout] 18 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/panic.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind` is never used
[INFO] [stdout]  --> src/enums.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum IpAddrKind{
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddr` is never constructed
[INFO] [stdout]  --> src/enums.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct IpAddr{
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/enums.rs:11:6
[INFO] [stdout]    |
[INFO] [stdout] 11 | enum Message{
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `some_fn` is never used
[INFO] [stdout]   --> src/enums.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | impl Message{
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] 20 |     fn some_fn(){
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/enums.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> src/enums.rs:55:6
[INFO] [stdout]    |
[INFO] [stdout] 55 | enum Coin{
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]   --> src/enums.rs:62:6
[INFO] [stdout]    |
[INFO] [stdout] 62 | enum UsState{
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `value_in_cents` is never used
[INFO] [stdout]   --> src/enums.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn value_in_cents(coin: Coin) -> u8{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/collections.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn main(){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/error_handling.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn main(){
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username` is never used
[INFO] [stdout]   --> src/error_handling.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn read_username() -> Result<String, io::Error>{
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main_updated` is never used
[INFO] [stdout]   --> src/error_handling.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn main_updated() -> Result<(), Box<dyn Error>>{
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/generic.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Point<T, U>{
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mix` is never used
[INFO] [stdout]  --> src/generic.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl<T, U> Point<T, U> {
[INFO] [stdout]   | ---------------------- method in this implementation
[INFO] [stdout] 8 |     fn mix<V, W>(self, other: Point<V, W>) -> Point<T, W>{
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Option` is never used
[INFO] [stdout]   --> src/generic.rs:19:6
[INFO] [stdout]    |
[INFO] [stdout] 19 | enum Option<T> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Result` is never used
[INFO] [stdout]   --> src/generic.rs:24:6
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum Result<T, E>{
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/generic.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_gen` is never used
[INFO] [stdout]   --> src/generic.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn largest_gen<T: PartialOrd + Copy>(lst: Vec<T>) -> T {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `headline` and `content` are never read
[INFO] [stdout]   --> src/traits.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct NewsArticle{
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 12 |     pub author: String,
[INFO] [stdout] 13 |     pub headline: String,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 14 |     pub content: String
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/traits.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub struct Tweet{
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 21 |     pub retweet: bool
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `summarize` and `summarize_author` are never used
[INFO] [stdout]   --> src/traits.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub trait Summary{
[INFO] [stdout]    |           ------- methods in this trait
[INFO] [stdout] 25 |     fn summarize(&self) -> String{
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     fn summarize_author(&self) -> String;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/traits.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub fn notify<T: Summary>(item1: &T, item2: &T){    // Can make sure both the parameters have the same type
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function` is never used
[INFO] [stdout]   --> src/traits.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn some_function<T, U>(t: &T, u: &U)
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_summarizable` is never used
[INFO] [stdout]   --> src/traits.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn returns_summarizable() -> impl Summary{  // returns a value that implements Summary
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]   --> src/traits.rs:94:8
[INFO] [stdout]    |
[INFO] [stdout] 94 | struct Pair<T>{
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/traits.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout] 100 | impl<T> Pair<T>{
[INFO] [stdout]     | --------------- associated function in this implementation
[INFO] [stdout] 101 |     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/traits.rs:106:8
[INFO] [stdout]     |
[INFO] [stdout] 105 | impl<T: Display + PartialOrd> Pair<T>{
[INFO] [stdout]     | ------------------------------------- method in this implementation
[INFO] [stdout] 106 |     fn cmp_display(&self){
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/traits.rs:117:8
[INFO] [stdout]     |
[INFO] [stdout] 117 | pub fn main(){
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/lifetimes.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct ImportantExcerpt<'a>{
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `announce_and_return_part` is never used
[INFO] [stdout]   --> src/lifetimes.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl<'a> ImportantExcerpt<'a>{
[INFO] [stdout]    | ----------------------------- method in this implementation
[INFO] [stdout] 11 | fn announce_and_return_part(&self, announcement: &str) -> &str{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/lifetimes.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/lifetimes.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str{  // this makes sure that every value returned will have the same lifetime as "'a", whi...
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_announcement` is never used
[INFO] [stdout]   --> src/lifetimes.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn longest_with_announcement<'a, T>(x: &'a str, y: &'a str, announce: T) -> &'a str where T:Display{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `simulated_expensive_calc` is never used
[INFO] [stdout]  --> src/closures.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn simulated_expensive_calc(intensity: u32) -> u32{
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generate_workout` is never used
[INFO] [stdout]   --> src/closures.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn generate_workout(intensity: u32, random_num: u32){
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]   --> src/closures.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Cacher<T> where T: Fn(u32) -> u32,{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/closures.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | impl<T> Cacher<T> where T:Fn(u32) -> u32,{
[INFO] [stdout]    | ----------------------------------------- associated items in this implementation
[INFO] [stdout] 43 |     fn new(calculation: T) -> Cacher<T>{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     fn value(&mut self, arg: u32) -> u32{
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/closures.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `next` is never used
[INFO] [stdout]  --> src/iters.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait Iterator{
[INFO] [stdout]   |           -------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 4 |     fn next(&mut self) -> Option<Self::Item>;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shoes_in_my_size` is never used
[INFO] [stdout]   --> src/iters.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe>{
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/iters.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | impl Counter{
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] 23 |     pub fn new() -> Counter{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/iters.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn main(){
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::str::from_utf8` with a invalid literal always return an error
[INFO] [stdout]   --> src/panic.rs:36:13
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let s = str::from_utf8(&[195, 40]).expect("Valid utf-8");
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^---------^
[INFO] [stdout]    |                             |
[INFO] [stdout]    |                             the literal was valid UTF-8 up to the 0 bytes
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(invalid_from_utf8)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/error_handling.rs:67:5
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fs::read_to_string("Hello.txt");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let _ = fs::read_to_string("Hello.txt");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/error_handling.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 71 |     main_updated();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 71 |     let _ = main_updated();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "a35e0f5b0435c600bb7d66b33d38c3a5bbedac49a855d5b8e39680c1e95b8690", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a35e0f5b0435c600bb7d66b33d38c3a5bbedac49a855d5b8e39680c1e95b8690", kill_on_drop: false }`
[INFO] [stdout] a35e0f5b0435c600bb7d66b33d38c3a5bbedac49a855d5b8e39680c1e95b8690