[INFO] fetching crate rust_project_demo 0.1.0...
[INFO] building rust_project_demo-0.1.0 against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] extracting crate rust_project_demo 0.1.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate rust_project_demo 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 rust_project_demo 0.1.0
[INFO] finished tweaking crates.io crate rust_project_demo 0.1.0
[INFO] tweaked toml for crates.io crate rust_project_demo 0.1.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate rust_project_demo 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] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rust_tutorials v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] fb6eae92df355cc016f1b9f2db5ac92639ee069e5842cf59f0055da110a941d8
[INFO] running `Command { std: "docker" "start" "-a" "fb6eae92df355cc016f1b9f2db5ac92639ee069e5842cf59f0055da110a941d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fb6eae92df355cc016f1b9f2db5ac92639ee069e5842cf59f0055da110a941d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb6eae92df355cc016f1b9f2db5ac92639ee069e5842cf59f0055da110a941d8", kill_on_drop: false }`
[INFO] [stdout] fb6eae92df355cc016f1b9f2db5ac92639ee069e5842cf59f0055da110a941d8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] b07868f824b21ed080a826424d5db3269e6d90965683a7aac9e8387202744b3d
[INFO] running `Command { std: "docker" "start" "-a" "b07868f824b21ed080a826424d5db3269e6d90965683a7aac9e8387202744b3d", kill_on_drop: false }`
[INFO] [stderr] warning: rust_project_demo v0.1.0 (/opt/rustwide/workdir) ignoring invalid dependency `rust_tutorials` which is missing a lib target
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.16
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling rust_project_demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]   --> src/lib.rs:53:32
[INFO] [stdout]    |
[INFO] [stdout] 53 | pub fn notify3<T, U>(item1: T, item2: U)
[INFO] [stdout]    |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::format`
[INFO] [stdout]  --> src/string.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::format;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/result_enum.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_project_demo::Summary`
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use rust_project_demo::Summary;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `array`
[INFO] [stdout]  --> src/array_type.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let array: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_array`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var`
[INFO] [stdout]   --> src/stack_heap.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let var = 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/stack_heap.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let y = x;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/reference_borrowing.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut s = String::from("hello");
[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: `res`
[INFO] [stdout]   --> src/struct.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let res=Rectangle::square(20);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/struct.rs:112:17
[INFO] [stdout]     |
[INFO] [stdout] 112 | pub fn greeting(name: &str) -> String {
[INFO] [stdout]     |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]   --> src/enum.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let four = Ipaddrtype::V4;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> src/enum.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let six = Ipaddrtype::V6;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Ipaddr6`
[INFO] [stdout]   --> src/enum.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let Ipaddr6 = Ipaddr {
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_Ipaddr6`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `call`
[INFO] [stdout]   --> src/enum.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let call = Ipaddr4.iptype.call();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_call`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Ipaddri`
[INFO] [stdout]   --> src/enum.rs:59:14
[INFO] [stdout]    |
[INFO] [stdout] 59 |         Some(Ipaddri) => Some(a.unwrap() + 1),
[INFO] [stdout]    |              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_Ipaddri`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/vector.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let row=vec![
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hashmap`
[INFO] [stdout]  --> src/hashmap.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let hashmap: HashMap<_, _> = teams.iter().zip(scores.iter()).collect();
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hashmap`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/result_enum.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut array = vec![1, 20, 3, 4, 0];
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/result_enum.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut array = vec![10, 20, 30, 4, 100];
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/result_enum.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let mut array = vec![String::from("hello"),String::from("world")];
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/result_enum.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     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/result_enum.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     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: `importantExcerpt`
[INFO] [stdout]   --> src/life_time.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let importantExcerpt = ImportantExcerpt {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_importantExcerpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/function_closures.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |     let s = example_closure(String::from("hello"));
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_two` is never used
[INFO] [stdout]    --> src/struct.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 108 | pub fn add_two(a: i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greeting` is never used
[INFO] [stdout]    --> src/struct.rs:112:8
[INFO] [stdout]     |
[INFO] [stdout] 112 | pub fn greeting(name: &str) -> String {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]  --> src/enum.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 |     V4(i8, i8, i8, i8),
[INFO] [stdout]   |     -- ^^  ^^  ^^  ^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Ipaddrtype` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 4 |     V4((), (), (), ()),
[INFO] [stdout]   |        ~~  ~~  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/enum.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 |     V6(String),
[INFO] [stdout]   |     -- ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Ipaddrtype` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 5 |     V6(()),
[INFO] [stdout]   |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `address` is never read
[INFO] [stdout]   --> src/enum.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Ipaddr {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 14 |     iptype: Ipaddrtype,
[INFO] [stdout] 15 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Ipaddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SpreadsheetCell` is never used
[INFO] [stdout]   --> src/vector.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum SpreadsheetCell{
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vector_enum` is never used
[INFO] [stdout]   --> src/vector.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn vector_enum() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mix` is never used
[INFO] [stdout]   --> src/generic.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl<T: Display, U: Debug> Point<T, U> {
[INFO] [stdout]    | -------------------------------------- method in this implementation
[INFO] [stdout] 19 |     fn mix<V, W>(self, other: Point<V, W>) -> Point<T, W> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]   --> src/life_time.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct ImportantExcerpt<'a> {
[INFO] [stdout]    |        ---------------- field in this struct
[INFO] [stdout] 40 |     part: &'a str,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `level` and `announce_and_return_part` are never used
[INFO] [stdout]   --> src/life_time.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]    | ----------------------------- methods in this implementation
[INFO] [stdout] 45 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_an_announcement` is never used
[INFO] [stdout]   --> src/life_time.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn longest_with_an_announcement<'a, T>(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/accepting_command_line_arguments.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Config` is never constructed
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | struct Config {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | impl Config {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] 48 |     // fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stdout] 49 |     fn new(mut args: std::env::Args) -> Result<Config, &'static str> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `search` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `search_case_insensitive` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:95:8
[INFO] [stdout]    |
[INFO] [stdout] 95 | pub fn search_case_insensitive<'a>(
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]    --> src/function_closures.rs:176:8
[INFO] [stdout]     |
[INFO] [stdout] 176 | struct Rectangle {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sort_by_key` is never used
[INFO] [stdout]    --> src/function_closures.rs:181:8
[INFO] [stdout]     |
[INFO] [stdout] 181 | pub fn sort_by_key() {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `produce_new_iterators` is never used
[INFO] [stdout]    --> src/function_closures.rs:272:8
[INFO] [stdout]     |
[INFO] [stdout] 272 | pub fn produce_new_iterators() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Counter` is never constructed
[INFO] [stdout]    --> src/function_closures.rs:282:8
[INFO] [stdout]     |
[INFO] [stdout] 282 | struct Counter {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/function_closures.rs:287:8
[INFO] [stdout]     |
[INFO] [stdout] 286 | impl Counter {
[INFO] [stdout]     | ------------ associated function in this implementation
[INFO] [stdout] 287 |     fn new() -> Counter {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ipaddr4` should have a snake case name
[INFO] [stdout]   --> src/enum.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let Ipaddr4 = Ipaddr {
[INFO] [stdout]    |         ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `ipaddr4`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ipaddr6` should have a snake case name
[INFO] [stdout]   --> src/enum.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let Ipaddr6 = Ipaddr {
[INFO] [stdout]    |         ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `ipaddr6`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ipaddri` should have a snake case name
[INFO] [stdout]   --> src/enum.rs:59:14
[INFO] [stdout]    |
[INFO] [stdout] 59 |         Some(Ipaddri) => Some(a.unwrap() + 1),
[INFO] [stdout]    |              ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `ipaddri`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/result_enum.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     read_username_from_file();
[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] 16 |     let _ = read_username_from_file();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `importantExcerpt` should have a snake case name
[INFO] [stdout]   --> src/life_time.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let importantExcerpt = ImportantExcerpt {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `important_excerpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [optimized + debuginfo] target(s) in 3.79s
[INFO] running `Command { std: "docker" "inspect" "b07868f824b21ed080a826424d5db3269e6d90965683a7aac9e8387202744b3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b07868f824b21ed080a826424d5db3269e6d90965683a7aac9e8387202744b3d", kill_on_drop: false }`
[INFO] [stdout] b07868f824b21ed080a826424d5db3269e6d90965683a7aac9e8387202744b3d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 0be76eab63d11e5eada15e22c1ebebcb53edd68d4f85ce1ae6a37baa98e111bc
[INFO] running `Command { std: "docker" "start" "-a" "0be76eab63d11e5eada15e22c1ebebcb53edd68d4f85ce1ae6a37baa98e111bc", kill_on_drop: false }`
[INFO] [stderr] warning: rust_project_demo v0.1.0 (/opt/rustwide/workdir) ignoring invalid dependency `rust_tutorials` which is missing a lib target
[INFO] [stderr]    Compiling rust_project_demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]   --> src/lib.rs:53:32
[INFO] [stdout]    |
[INFO] [stdout] 53 | pub fn notify3<T, U>(item1: T, item2: U)
[INFO] [stdout]    |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::format`
[INFO] [stdout]  --> src/string.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::format;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/result_enum.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_project_demo::Summary`
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use rust_project_demo::Summary;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `array`
[INFO] [stdout]  --> src/array_type.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let array: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_array`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var`
[INFO] [stdout]   --> src/stack_heap.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let var = 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/stack_heap.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let y = x;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/reference_borrowing.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut s = String::from("hello");
[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: `res`
[INFO] [stdout]   --> src/struct.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let res=Rectangle::square(20);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/struct.rs:112:17
[INFO] [stdout]     |
[INFO] [stdout] 112 | pub fn greeting(name: &str) -> String {
[INFO] [stdout]     |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]   --> src/enum.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let four = Ipaddrtype::V4;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> src/enum.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let six = Ipaddrtype::V6;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Ipaddr6`
[INFO] [stdout]   --> src/enum.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let Ipaddr6 = Ipaddr {
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_Ipaddr6`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `call`
[INFO] [stdout]   --> src/enum.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let call = Ipaddr4.iptype.call();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_call`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Ipaddri`
[INFO] [stdout]   --> src/enum.rs:59:14
[INFO] [stdout]    |
[INFO] [stdout] 59 |         Some(Ipaddri) => Some(a.unwrap() + 1),
[INFO] [stdout]    |              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_Ipaddri`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/vector.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let row=vec![
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hashmap`
[INFO] [stdout]  --> src/hashmap.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let hashmap: HashMap<_, _> = teams.iter().zip(scores.iter()).collect();
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hashmap`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/result_enum.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut array = vec![1, 20, 3, 4, 0];
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/result_enum.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut array = vec![10, 20, 30, 4, 100];
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/result_enum.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let mut array = vec![String::from("hello"),String::from("world")];
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/result_enum.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     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/result_enum.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     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: `importantExcerpt`
[INFO] [stdout]   --> src/life_time.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let importantExcerpt = ImportantExcerpt {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_importantExcerpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/function_closures.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |     let s = example_closure(String::from("hello"));
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_two` is never used
[INFO] [stdout]    --> src/struct.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 108 | pub fn add_two(a: i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greeting` is never used
[INFO] [stdout]    --> src/struct.rs:112:8
[INFO] [stdout]     |
[INFO] [stdout] 112 | pub fn greeting(name: &str) -> String {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]  --> src/enum.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 |     V4(i8, i8, i8, i8),
[INFO] [stdout]   |     -- ^^  ^^  ^^  ^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Ipaddrtype` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 4 |     V4((), (), (), ()),
[INFO] [stdout]   |        ~~  ~~  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/enum.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 |     V6(String),
[INFO] [stdout]   |     -- ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Ipaddrtype` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 5 |     V6(()),
[INFO] [stdout]   |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `address` is never read
[INFO] [stdout]   --> src/enum.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Ipaddr {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 14 |     iptype: Ipaddrtype,
[INFO] [stdout] 15 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Ipaddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SpreadsheetCell` is never used
[INFO] [stdout]   --> src/vector.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum SpreadsheetCell{
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vector_enum` is never used
[INFO] [stdout]   --> src/vector.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn vector_enum() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mix` is never used
[INFO] [stdout]   --> src/generic.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl<T: Display, U: Debug> Point<T, U> {
[INFO] [stdout]    | -------------------------------------- method in this implementation
[INFO] [stdout] 19 |     fn mix<V, W>(self, other: Point<V, W>) -> Point<T, W> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]   --> src/life_time.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct ImportantExcerpt<'a> {
[INFO] [stdout]    |        ---------------- field in this struct
[INFO] [stdout] 40 |     part: &'a str,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `level` and `announce_and_return_part` are never used
[INFO] [stdout]   --> src/life_time.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]    | ----------------------------- methods in this implementation
[INFO] [stdout] 45 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_an_announcement` is never used
[INFO] [stdout]   --> src/life_time.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn longest_with_an_announcement<'a, T>(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/accepting_command_line_arguments.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Config` is never constructed
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | struct Config {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | impl Config {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] 48 |     // fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stdout] 49 |     fn new(mut args: std::env::Args) -> Result<Config, &'static str> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `search` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `search_case_insensitive` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:95:8
[INFO] [stdout]    |
[INFO] [stdout] 95 | pub fn search_case_insensitive<'a>(
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]    --> src/function_closures.rs:176:8
[INFO] [stdout]     |
[INFO] [stdout] 176 | struct Rectangle {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sort_by_key` is never used
[INFO] [stdout]    --> src/function_closures.rs:181:8
[INFO] [stdout]     |
[INFO] [stdout] 181 | pub fn sort_by_key() {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `produce_new_iterators` is never used
[INFO] [stdout]    --> src/function_closures.rs:272:8
[INFO] [stdout]     |
[INFO] [stdout] 272 | pub fn produce_new_iterators() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Counter` is never constructed
[INFO] [stdout]    --> src/function_closures.rs:282:8
[INFO] [stdout]     |
[INFO] [stdout] 282 | struct Counter {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/function_closures.rs:287:8
[INFO] [stdout]     |
[INFO] [stdout] 286 | impl Counter {
[INFO] [stdout]     | ------------ associated function in this implementation
[INFO] [stdout] 287 |     fn new() -> Counter {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ipaddr4` should have a snake case name
[INFO] [stdout]   --> src/enum.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let Ipaddr4 = Ipaddr {
[INFO] [stdout]    |         ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `ipaddr4`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ipaddr6` should have a snake case name
[INFO] [stdout]   --> src/enum.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let Ipaddr6 = Ipaddr {
[INFO] [stdout]    |         ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `ipaddr6`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ipaddri` should have a snake case name
[INFO] [stdout]   --> src/enum.rs:59:14
[INFO] [stdout]    |
[INFO] [stdout] 59 |         Some(Ipaddri) => Some(a.unwrap() + 1),
[INFO] [stdout]    |              ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `ipaddri`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/result_enum.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     read_username_from_file();
[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] 16 |     let _ = read_username_from_file();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `importantExcerpt` should have a snake case name
[INFO] [stdout]   --> src/life_time.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let importantExcerpt = ImportantExcerpt {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `important_excerpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_project_demo`
[INFO] [stdout]  --> tests/another_integration_test.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rust_project_demo;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::format`
[INFO] [stdout]  --> src/string.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::format;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/result_enum.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_project_demo::Summary`
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use rust_project_demo::Summary;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> tests/result_test.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub struct Guess {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 27 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]   --> src/lib.rs:53:32
[INFO] [stdout]    |
[INFO] [stdout] 53 | pub fn notify3<T, U>(item1: T, item2: U)
[INFO] [stdout]    |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_project_demo`
[INFO] [stdout]  --> tests/integration_test.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rust_project_demo;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `array`
[INFO] [stdout]  --> src/array_type.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let array: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_array`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var`
[INFO] [stdout]   --> src/stack_heap.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let var = 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/stack_heap.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let y = x;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/reference_borrowing.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut s = String::from("hello");
[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: `res`
[INFO] [stdout]   --> src/struct.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let res=Rectangle::square(20);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/struct.rs:112:17
[INFO] [stdout]     |
[INFO] [stdout] 112 | pub fn greeting(name: &str) -> String {
[INFO] [stdout]     |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]   --> src/enum.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let four = Ipaddrtype::V4;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> src/enum.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let six = Ipaddrtype::V6;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Ipaddr6`
[INFO] [stdout]   --> src/enum.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let Ipaddr6 = Ipaddr {
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_Ipaddr6`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `call`
[INFO] [stdout]   --> src/enum.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let call = Ipaddr4.iptype.call();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_call`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Ipaddri`
[INFO] [stdout]   --> src/enum.rs:59:14
[INFO] [stdout]    |
[INFO] [stdout] 59 |         Some(Ipaddri) => Some(a.unwrap() + 1),
[INFO] [stdout]    |              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_Ipaddri`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/vector.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let row=vec![
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hashmap`
[INFO] [stdout]  --> src/hashmap.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let hashmap: HashMap<_, _> = teams.iter().zip(scores.iter()).collect();
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hashmap`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/result_enum.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut array = vec![1, 20, 3, 4, 0];
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/result_enum.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut array = vec![10, 20, 30, 4, 100];
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/result_enum.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let mut array = vec![String::from("hello"),String::from("world")];
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/result_enum.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     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/result_enum.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     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: `importantExcerpt`
[INFO] [stdout]   --> src/life_time.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let importantExcerpt = ImportantExcerpt {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_importantExcerpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/function_closures.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |     let s = example_closure(String::from("hello"));
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]  --> src/enum.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 |     V4(i8, i8, i8, i8),
[INFO] [stdout]   |     -- ^^  ^^  ^^  ^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Ipaddrtype` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 4 |     V4((), (), (), ()),
[INFO] [stdout]   |        ~~  ~~  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/enum.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 |     V6(String),
[INFO] [stdout]   |     -- ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Ipaddrtype` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 5 |     V6(()),
[INFO] [stdout]   |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `address` is never read
[INFO] [stdout]   --> src/enum.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Ipaddr {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 14 |     iptype: Ipaddrtype,
[INFO] [stdout] 15 |     address: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Ipaddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SpreadsheetCell` is never used
[INFO] [stdout]   --> src/vector.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum SpreadsheetCell{
[INFO] [stdout]    |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vector_enum` is never used
[INFO] [stdout]   --> src/vector.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn vector_enum() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mix` is never used
[INFO] [stdout]   --> src/generic.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl<T: Display, U: Debug> Point<T, U> {
[INFO] [stdout]    | -------------------------------------- method in this implementation
[INFO] [stdout] 19 |     fn mix<V, W>(self, other: Point<V, W>) -> Point<T, W> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]   --> src/life_time.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct ImportantExcerpt<'a> {
[INFO] [stdout]    |        ---------------- field in this struct
[INFO] [stdout] 40 |     part: &'a str,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `level` and `announce_and_return_part` are never used
[INFO] [stdout]   --> src/life_time.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]    | ----------------------------- methods in this implementation
[INFO] [stdout] 45 |     fn level(&self) -> i32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_an_announcement` is never used
[INFO] [stdout]   --> src/life_time.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn longest_with_an_announcement<'a, T>(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/accepting_command_line_arguments.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Config` is never constructed
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | struct Config {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | impl Config {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] 48 |     // fn new(args: &[String]) -> Result<Config, &'static str> {
[INFO] [stdout] 49 |     fn new(mut args: std::env::Args) -> Result<Config, &'static str> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `search_case_insensitive` is never used
[INFO] [stdout]   --> src/accepting_command_line_arguments.rs:95:8
[INFO] [stdout]    |
[INFO] [stdout] 95 | pub fn search_case_insensitive<'a>(
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]    --> src/function_closures.rs:176:8
[INFO] [stdout]     |
[INFO] [stdout] 176 | struct Rectangle {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sort_by_key` is never used
[INFO] [stdout]    --> src/function_closures.rs:181:8
[INFO] [stdout]     |
[INFO] [stdout] 181 | pub fn sort_by_key() {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `produce_new_iterators` is never used
[INFO] [stdout]    --> src/function_closures.rs:272:8
[INFO] [stdout]     |
[INFO] [stdout] 272 | pub fn produce_new_iterators() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_iterators` is never used
[INFO] [stdout]    --> src/function_closures.rs:207:12
[INFO] [stdout]     |
[INFO] [stdout] 207 |     pub fn use_iterators() {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ipaddr4` should have a snake case name
[INFO] [stdout]   --> src/enum.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let Ipaddr4 = Ipaddr {
[INFO] [stdout]    |         ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `ipaddr4`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ipaddr6` should have a snake case name
[INFO] [stdout]   --> src/enum.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let Ipaddr6 = Ipaddr {
[INFO] [stdout]    |         ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `ipaddr6`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Ipaddri` should have a snake case name
[INFO] [stdout]   --> src/enum.rs:59:14
[INFO] [stdout]    |
[INFO] [stdout] 59 |         Some(Ipaddri) => Some(a.unwrap() + 1),
[INFO] [stdout]    |              ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `ipaddri`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/result_enum.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     read_username_from_file();
[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] 16 |     let _ = read_username_from_file();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `importantExcerpt` should have a snake case name
[INFO] [stdout]   --> src/life_time.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let importantExcerpt = ImportantExcerpt {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `important_excerpt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [optimized + debuginfo] target(s) in 0.58s
[INFO] running `Command { std: "docker" "inspect" "0be76eab63d11e5eada15e22c1ebebcb53edd68d4f85ce1ae6a37baa98e111bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0be76eab63d11e5eada15e22c1ebebcb53edd68d4f85ce1ae6a37baa98e111bc", kill_on_drop: false }`
[INFO] [stdout] 0be76eab63d11e5eada15e22c1ebebcb53edd68d4f85ce1ae6a37baa98e111bc