[INFO] cloning repository https://github.com/DJ-UKOL/RustBook
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/DJ-UKOL/RustBook" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDJ-UKOL%2FRustBook", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDJ-UKOL%2FRustBook'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 17172e472596cf70f638d0df2a813ed236da1c3e
[INFO] checking DJ-UKOL/RustBook/17172e472596cf70f638d0df2a813ed236da1c3e against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDJ-UKOL%2FRustBook" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/DJ-UKOL/RustBook on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/DJ-UKOL/RustBook
[INFO] finished tweaking git repo https://github.com/DJ-UKOL/RustBook
[INFO] tweaked toml for git repo https://github.com/DJ-UKOL/RustBook written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/DJ-UKOL/RustBook 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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2cfacb505624dab8d81245fd5a2e385aaad42792549b337d72f13e6eaaa406f3
[INFO] running `Command { std: "docker" "start" "-a" "2cfacb505624dab8d81245fd5a2e385aaad42792549b337d72f13e6eaaa406f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2cfacb505624dab8d81245fd5a2e385aaad42792549b337d72f13e6eaaa406f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2cfacb505624dab8d81245fd5a2e385aaad42792549b337d72f13e6eaaa406f3", kill_on_drop: false }`
[INFO] [stdout] 2cfacb505624dab8d81245fd5a2e385aaad42792549b337d72f13e6eaaa406f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bf39e482b6620334c8bcc5bd7554331f0889514427965e01763096d20df9d01a
[INFO] running `Command { std: "docker" "start" "-a" "bf39e482b6620334c8bcc5bd7554331f0889514427965e01763096d20df9d01a", kill_on_drop: false }`
[INFO] [stderr]     Checking RustBook v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::enums::IpAddrKind::V4`
[INFO] [stdout]  --> src/enums.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::enums::IpAddrKind::V4;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::enums::IpAddrKind::V4`
[INFO] [stdout]  --> src/enums.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::enums::IpAddrKind::V4;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/hash_maps.rs:126:12
[INFO] [stdout]     |
[INFO] [stdout] 126 |         if (words.len() == 4) {
[INFO] [stdout]     |            ^                ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 126 -         if (words.len() == 4) {
[INFO] [stdout] 126 +         if words.len() == 4 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::rectangles::rectangles`
[INFO] [stdout]  --> src/errors.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::rectangles::rectangles;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::slice::IterMut`
[INFO] [stdout]  --> src/aggregator.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::slice::IterMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::variables::variables`
[INFO] [stdout]   --> src/main.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | use crate::variables::variables;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::functions::functions`
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | use crate::functions::functions;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::branches::branches`
[INFO] [stdout]   --> src/main.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | use crate::branches::branches;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::loops::loops`
[INFO] [stdout]   --> src/main.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | use crate::loops::loops;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::ownership::ownership`
[INFO] [stdout]   --> src/main.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | use crate::ownership::ownership;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::references::references`
[INFO] [stdout]   --> src/main.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | use crate::references::references;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::dangling::dangling`
[INFO] [stdout]   --> src/main.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | use crate::dangling::dangling;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::slices::slices`
[INFO] [stdout]   --> src/main.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | use crate::slices::slices;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::structs::structs`
[INFO] [stdout]   --> src/main.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | use crate::structs::structs;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::rectangles::rectangles`
[INFO] [stdout]   --> src/main.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | use crate::rectangles::rectangles;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::enums::enums`
[INFO] [stdout]   --> src/main.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | use crate::enums::enums;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::matches::matches`
[INFO] [stdout]   --> src/main.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | use crate::matches::matches;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::iflets::iflets`
[INFO] [stdout]   --> src/main.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | use crate::iflets::iflets;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::vectors::vectors`
[INFO] [stdout]   --> src/main.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 | use crate::vectors::vectors;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::strings::strings`
[INFO] [stdout]   --> src/main.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | use crate::strings::strings;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::hash_maps::hash_maps`
[INFO] [stdout]   --> src/main.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | use crate::hash_maps::hash_maps;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/hash_maps.rs:126:12
[INFO] [stdout]     |
[INFO] [stdout] 126 |         if (words.len() == 4) {
[INFO] [stdout]     |            ^                ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 126 -         if (words.len() == 4) {
[INFO] [stdout] 126 +         if words.len() == 4 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::rectangles::rectangles`
[INFO] [stdout]  --> src/errors.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::rectangles::rectangles;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::slice::IterMut`
[INFO] [stdout]  --> src/aggregator.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::slice::IterMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::variables::variables`
[INFO] [stdout]   --> src/main.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | use crate::variables::variables;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::functions::functions`
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | use crate::functions::functions;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::branches::branches`
[INFO] [stdout]   --> src/main.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | use crate::branches::branches;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::loops::loops`
[INFO] [stdout]   --> src/main.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | use crate::loops::loops;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::ownership::ownership`
[INFO] [stdout]   --> src/main.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | use crate::ownership::ownership;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::references::references`
[INFO] [stdout]   --> src/main.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | use crate::references::references;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::dangling::dangling`
[INFO] [stdout]   --> src/main.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | use crate::dangling::dangling;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::slices::slices`
[INFO] [stdout]   --> src/main.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | use crate::slices::slices;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::structs::structs`
[INFO] [stdout]   --> src/main.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | use crate::structs::structs;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::rectangles::rectangles`
[INFO] [stdout]   --> src/main.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 | use crate::rectangles::rectangles;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::enums::enums`
[INFO] [stdout]   --> src/main.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | use crate::enums::enums;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::matches::matches`
[INFO] [stdout]   --> src/main.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | use crate::matches::matches;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::iflets::iflets`
[INFO] [stdout]   --> src/main.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | use crate::iflets::iflets;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::vectors::vectors`
[INFO] [stdout]   --> src/main.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 | use crate::vectors::vectors;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::strings::strings`
[INFO] [stdout]   --> src/main.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | use crate::strings::strings;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::hash_maps::hash_maps`
[INFO] [stdout]   --> src/main.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | use crate::hash_maps::hash_maps;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::errors::errors`
[INFO] [stdout]   --> src/main.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | use crate::errors::errors;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::generics::generics`
[INFO] [stdout]   --> src/main.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | use crate::generics::generics;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::traits::traits`
[INFO] [stdout]   --> src/main.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | use crate::traits::traits;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::lifetimes::lifetimes`
[INFO] [stdout]   --> src/main.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 | use crate::lifetimes::lifetimes;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::closures::closures`
[INFO] [stdout]   --> src/main.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 | use crate::closures::closures;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::errors::errors`
[INFO] [stdout]   --> src/main.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | use crate::errors::errors;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::generics::generics`
[INFO] [stdout]   --> src/main.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | use crate::generics::generics;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::traits::traits`
[INFO] [stdout]   --> src/main.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | use crate::traits::traits;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::lifetimes::lifetimes`
[INFO] [stdout]   --> src/main.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 | use crate::lifetimes::lifetimes;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::closures::closures`
[INFO] [stdout]   --> src/main.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 | use crate::closures::closures;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]  --> src/slices.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let hello = &s[0..5];
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]  --> src/slices.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let world = &s[6..11];
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/slices.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut s = String::from("Hello World!");
[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: `user3`
[INFO] [stdout]   --> src/structs.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let user3 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structs.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     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: `width1`
[INFO] [stdout]   --> src/rectangles.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let width1 = 30;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_width1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `height`
[INFO] [stdout]   --> src/rectangles.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let height = 50;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_height`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]   --> src/enums.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let four = IpAddrKind::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/enums.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let six = IpAddrKind::V6;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/enums.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let home = IpAddr {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/enums.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let loopback = IpAddr {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home2`
[INFO] [stdout]   --> src/enums.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let home2 = IpAddr2::V4(127, 0, 0 , 1);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_home2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback2`
[INFO] [stdout]   --> src/enums.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let loopback2 = IpAddr2::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]  --> src/matches.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let six = plus_one(five);
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]  --> src/matches.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let none = plus_one(None);
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]  --> src/slices.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let hello = &s[0..5];
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]  --> src/slices.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let world = &s[6..11];
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/slices.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut s = String::from("Hello World!");
[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: `v`
[INFO] [stdout]  --> src/vectors.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let v:Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1`
[INFO] [stdout]  --> src/vectors.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let v1 = vec![1, 2, 3];
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/vectors.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     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: `user3`
[INFO] [stdout]   --> src/structs.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let user3 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structs.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     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: `sd`
[INFO] [stdout]  --> src/strings.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let sd = data.to_string();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_sd`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str_data`
[INFO] [stdout]  --> src/strings.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let str_data = "initial content".to_string();
[INFO] [stdout]   |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str_from`
[INFO] [stdout]   --> src/strings.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let str_from = String::from("initial content");
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_from`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `width1`
[INFO] [stdout]   --> src/rectangles.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let width1 = 30;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_width1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/strings.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let s = format!("{s1}-{s2}-{s3}");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `height`
[INFO] [stdout]   --> src/rectangles.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let height = 50;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_height`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]   --> src/enums.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let four = IpAddrKind::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/enums.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let six = IpAddrKind::V6;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/enums.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let home = IpAddr {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/enums.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let loopback = IpAddr {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home2`
[INFO] [stdout]   --> src/enums.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let home2 = IpAddr2::V4(127, 0, 0 , 1);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_home2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback2`
[INFO] [stdout]   --> src/enums.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let loopback2 = IpAddr2::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]  --> src/matches.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let six = plus_one(five);
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]  --> src/matches.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let none = plus_one(None);
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> src/vectors.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let v:Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1`
[INFO] [stdout]  --> src/vectors.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let v1 = vec![1, 2, 3];
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/vectors.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let row = vec![
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/hash_maps.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let mut max_value = map.values().max().unwrap();
[INFO] [stdout]    |         ----^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sd`
[INFO] [stdout]  --> src/strings.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let sd = data.to_string();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_sd`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str_data`
[INFO] [stdout]  --> src/strings.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let str_data = "initial content".to_string();
[INFO] [stdout]   |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str_from`
[INFO] [stdout]   --> src/strings.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let str_from = String::from("initial content");
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_from`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/strings.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let s = format!("{s1}-{s2}-{s3}");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `greeting_file`
[INFO] [stdout]   --> src/errors.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let greeting_file = File::open("hello.txt").unwrap_or_else(|error| {
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_greeting_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/aggregator.rs:54:17
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn notify_3(item: &impl Summary, item2: &impl Summary) {}
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]   --> src/aggregator.rs:54:38
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn notify_3(item: &impl Summary, item2: &impl Summary) {}
[INFO] [stdout]    |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item1`
[INFO] [stdout]   --> src/aggregator.rs:57:29
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub fn notify_4<T: Summary>(item1: &T, item2: &T) {}
[INFO] [stdout]    |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_item1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]   --> src/aggregator.rs:57:40
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub fn notify_4<T: Summary>(item1: &T, item2: &T) {}
[INFO] [stdout]    |                                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/aggregator.rs:60:17
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub fn notify_5(item: &(impl Summary + Display)) {}
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/aggregator.rs:63:39
[INFO] [stdout]    |
[INFO] [stdout] 63 | pub fn notify_6<T: Summary + Display>(item: &T) {}
[INFO] [stdout]    |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/aggregator.rs:67:60
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub fn some_function<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> i32 {
[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/aggregator.rs:67:67
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub fn some_function<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> i32 {
[INFO] [stdout]    |                                                                   ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/aggregator.rs:72:29
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn some_function2<T, U>(t: &T, u: &U) -> i32
[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/aggregator.rs:72:36
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn some_function2<T, U>(t: &T, u: &U) -> i32
[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:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let i = ImportantExcerpt {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/closures.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let value = String::from("closure called");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/hash_maps.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let mut max_value = map.values().max().unwrap();
[INFO] [stdout]    |         ----^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `greeting_file`
[INFO] [stdout]   --> src/errors.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let greeting_file = File::open("hello.txt").unwrap_or_else(|error| {
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_greeting_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variables` is never used
[INFO] [stdout]  --> src/variables.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn variables() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `functions` is never used
[INFO] [stdout]  --> src/functions.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn functions() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `another_function` is never used
[INFO] [stdout]   --> src/functions.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn another_function() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_with_arguments` is never used
[INFO] [stdout]   --> src/functions.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn function_with_arguments(x: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_labeled_measurement` is never used
[INFO] [stdout]   --> src/functions.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn print_labeled_measurement(value: i32, unit_label: char) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `five` is never used
[INFO] [stdout]   --> src/functions.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn five() -> i32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_one` is never used
[INFO] [stdout]   --> src/functions.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn plus_one(y: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `branches` is never used
[INFO] [stdout]  --> src/branches.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn branches() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loops` is never used
[INFO] [stdout]  --> src/loops.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn loops() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_label` is never used
[INFO] [stdout]   --> src/loops.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn loop_with_label() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_while` is never used
[INFO] [stdout]   --> src/loops.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn loop_with_while() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_for` is never used
[INFO] [stdout]   --> src/loops.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn loop_with_for() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership` is never used
[INFO] [stdout]  --> src/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn ownership() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/ownership.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_and_gives_back` is never used
[INFO] [stdout]   --> src/ownership.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn takes_and_gives_back(a_string: String) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gives_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn gives_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/ownership.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn makes_copy(some_integer: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn takes_ownership(some_string: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `references` is never used
[INFO] [stdout]  --> src/references.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn references() {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]   --> src/references.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn change(some_string: &mut String) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/references.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn calculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dangling` is never used
[INFO] [stdout]  --> src/dangling.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn dangling() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dangle` is never used
[INFO] [stdout]   --> src/dangling.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn dangle() -> String {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `slices` is never used
[INFO] [stdout]  --> src/slices.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn slices() {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/slices.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn first_word(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word2` is never used
[INFO] [stdout]   --> src/slices.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn first_word2(s: &String) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/structs.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]  --> src/structs.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Color(i32, i32, i32);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/structs.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Point(i32, i32, i32);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `structs` is never used
[INFO] [stdout]   --> src/structs.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn structs() {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/structs.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/rectangles.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/aggregator.rs:54:17
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn notify_3(item: &impl Summary, item2: &impl Summary) {}
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]   --> src/aggregator.rs:54:38
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn notify_3(item: &impl Summary, item2: &impl Summary) {}
[INFO] [stdout]    |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item1`
[INFO] [stdout]   --> src/aggregator.rs:57:29
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub fn notify_4<T: Summary>(item1: &T, item2: &T) {}
[INFO] [stdout]    |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_item1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item2`
[INFO] [stdout]   --> src/aggregator.rs:57:40
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub fn notify_4<T: Summary>(item1: &T, item2: &T) {}
[INFO] [stdout]    |                                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_item2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/aggregator.rs:60:17
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub fn notify_5(item: &(impl Summary + Display)) {}
[INFO] [stdout]    |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/aggregator.rs:63:39
[INFO] [stdout]    |
[INFO] [stdout] 63 | pub fn notify_6<T: Summary + Display>(item: &T) {}
[INFO] [stdout]    |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `area`, `can_hold`, and `square` are never used
[INFO] [stdout]   --> src/rectangles.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl Rectangle {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 11 |     fn area(&self) -> u32 {     // self - экземпляр структуры
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     fn square(size: u32) -> Self {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rectangles` is never used
[INFO] [stdout]   --> src/rectangles.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn rectangles() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/aggregator.rs:67:60
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub fn some_function<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> i32 {
[INFO] [stdout]    |                                                            ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]   --> src/rectangles.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn area(width: u32, height: u32) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area2` is never used
[INFO] [stdout]   --> src/rectangles.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn area2(dimensions: (u32, u32)) -> u32{
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area3` is never used
[INFO] [stdout]   --> src/rectangles.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn area3(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind` is never used
[INFO] [stdout]  --> src/enums.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum IpAddrKind {
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddr2` is never used
[INFO] [stdout]  --> src/enums.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum IpAddr2 {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/enums.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/enums.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl Message {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 22 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddr` is never constructed
[INFO] [stdout]   --> src/enums.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct IpAddr {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `enums` is never used
[INFO] [stdout]   --> src/enums.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn enums() {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `route` is never used
[INFO] [stdout]   --> src/enums.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn route(ip_kind: IpAddrKind) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `matches` is never used
[INFO] [stdout]  --> src/matches.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn matches() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]  --> src/matches.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 7 | enum UsState {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> src/matches.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `value_in_cent` is never used
[INFO] [stdout]   --> src/matches.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn value_in_cent(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_one` is never used
[INFO] [stdout]   --> src/matches.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `iflets` is never used
[INFO] [stdout]  --> src/iflets.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn iflets() {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SpreadSheetCell` is never used
[INFO] [stdout]  --> src/vectors.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum SpreadSheetCell {
[INFO] [stdout]   |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vectors` is never used
[INFO] [stdout]  --> src/vectors.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn vectors() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `strings` is never used
[INFO] [stdout]  --> src/strings.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn strings() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hash_maps` is never used
[INFO] [stdout]  --> src/hash_maps.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn hash_maps() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `exercise_1` is never used
[INFO] [stdout]   --> src/hash_maps.rs:64:4
[INFO] [stdout]    |
[INFO] [stdout] 64 | fn exercise_1(list: &mut Vec<i32>) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pig_latin` is never used
[INFO] [stdout]    --> src/hash_maps.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn pig_latin(string: &String) {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_staff` is never used
[INFO] [stdout]    --> src/hash_maps.rs:115:4
[INFO] [stdout]     |
[INFO] [stdout] 115 | fn add_staff() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/aggregator.rs:67:67
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub fn some_function<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> i32 {
[INFO] [stdout]    |                                                                   ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `enter_console` is never used
[INFO] [stdout]    --> src/hash_maps.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn enter_console(string: String) -> String {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/aggregator.rs:72:29
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn some_function2<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]    |                             ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `errors` is never used
[INFO] [stdout]  --> src/errors.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn errors() {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/aggregator.rs:72:36
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn some_function2<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]    |                                    ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]   --> src/errors.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file2` is never used
[INFO] [stdout]   --> src/errors.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn read_username_from_file2() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/lifetimes.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let i = ImportantExcerpt {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file3` is never used
[INFO] [stdout]   --> src/errors.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn read_username_from_file3() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file4` is never used
[INFO] [stdout]   --> src/errors.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn read_username_from_file4() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generics` is never used
[INFO] [stdout]  --> src/generics.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn generics() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_i32` is never used
[INFO] [stdout]   --> src/generics.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn largest_i32(list: &[i32]) -> &i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_char` is never used
[INFO] [stdout]   --> src/generics.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn largest_char(list: &[char]) -> &char {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `traits` is never used
[INFO] [stdout]  --> src/traits.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn traits() {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `summarize` is never used
[INFO] [stdout]  --> src/aggregator.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub trait Summary {
[INFO] [stdout]   |           ------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 8 |     fn summarize(&self) -> String {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/aggregator.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct NewsArticle {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 17 |     pub content:String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/aggregator.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 31 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/aggregator.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn notify(item: &impl Summary) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_2` is never used
[INFO] [stdout]   --> src/aggregator.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub fn notify_2<T: Summary>(item: &T) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_3` is never used
[INFO] [stdout]   --> src/aggregator.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn notify_3(item: &impl Summary, item2: &impl Summary) {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_4` is never used
[INFO] [stdout]   --> src/aggregator.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub fn notify_4<T: Summary>(item1: &T, item2: &T) {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_5` is never used
[INFO] [stdout]   --> src/aggregator.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub fn notify_5(item: &(impl Summary + Display)) {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_6` is never used
[INFO] [stdout]   --> src/aggregator.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 63 | pub fn notify_6<T: Summary + Display>(item: &T) {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function` is never used
[INFO] [stdout]   --> src/aggregator.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub fn some_function<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function2` is never used
[INFO] [stdout]   --> src/aggregator.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn some_function2<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_summarize` is never used
[INFO] [stdout]   --> src/aggregator.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 | pub fn returns_summarize() -> impl Summary {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/lifetimes.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct ImportantExcerpt<'a> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/closures.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let value = String::from("closure called");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lifetimes` is never used
[INFO] [stdout]  --> src/lifetimes.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn lifetimes() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/lifetimes.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {     // возвращаемая ссылка будет действительна до тех пор, пока валидны оба параме...
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/closures.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ShirtColor` is never used
[INFO] [stdout]   --> src/closures.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum ShirtColor {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Inventory` is never constructed
[INFO] [stdout]   --> src/closures.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Inventory {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `giveaway` and `most_stocked` are never used
[INFO] [stdout]   --> src/closures.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl Inventory {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 21 |     fn giveaway(&self, user_preference: Option<ShirtColor>) -> ShirtColor { // user_preference - необязательный параметр, выбор цвета пол...
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn most_stocked(&self) -> ShirtColor {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `closures` is never used
[INFO] [stdout]   --> src/closures.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn closures() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `capturing` is never used
[INFO] [stdout]    --> src/closures.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn capturing() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Shoe` is never constructed
[INFO] [stdout]   --> src/iterators.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct Shoe {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shoes_in_size` is never used
[INFO] [stdout]   --> src/iterators.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn shoes_in_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variables` is never used
[INFO] [stdout]  --> src/variables.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn variables() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `functions` is never used
[INFO] [stdout]  --> src/functions.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn functions() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `another_function` is never used
[INFO] [stdout]   --> src/functions.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn another_function() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_with_arguments` is never used
[INFO] [stdout]   --> src/functions.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn function_with_arguments(x: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_labeled_measurement` is never used
[INFO] [stdout]   --> src/functions.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn print_labeled_measurement(value: i32, unit_label: char) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `five` is never used
[INFO] [stdout]   --> src/functions.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn five() -> i32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_one` is never used
[INFO] [stdout]   --> src/functions.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn plus_one(y: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `branches` is never used
[INFO] [stdout]  --> src/branches.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn branches() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loops` is never used
[INFO] [stdout]  --> src/loops.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn loops() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_label` is never used
[INFO] [stdout]   --> src/loops.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn loop_with_label() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 151 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_while` is never used
[INFO] [stdout]   --> src/loops.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn loop_with_while() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_with_for` is never used
[INFO] [stdout]   --> src/loops.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn loop_with_for() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership` is never used
[INFO] [stdout]  --> src/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn ownership() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/ownership.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_and_gives_back` is never used
[INFO] [stdout]   --> src/ownership.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn takes_and_gives_back(a_string: String) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gives_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn gives_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/ownership.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn makes_copy(some_integer: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn takes_ownership(some_string: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `references` is never used
[INFO] [stdout]  --> src/references.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn references() {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]   --> src/references.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn change(some_string: &mut String) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/references.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn calculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dangling` is never used
[INFO] [stdout]  --> src/dangling.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn dangling() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dangle` is never used
[INFO] [stdout]   --> src/dangling.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn dangle() -> String {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `slices` is never used
[INFO] [stdout]  --> src/slices.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn slices() {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/slices.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn first_word(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word2` is never used
[INFO] [stdout]   --> src/slices.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn first_word2(s: &String) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/structs.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]  --> src/structs.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Color(i32, i32, i32);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]  --> src/structs.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Point(i32, i32, i32);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `structs` is never used
[INFO] [stdout]   --> src/structs.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn structs() {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/structs.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/rectangles.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `area`, `can_hold`, and `square` are never used
[INFO] [stdout]   --> src/rectangles.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl Rectangle {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 11 |     fn area(&self) -> u32 {     // self - экземпляр структуры
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     fn square(size: u32) -> Self {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rectangles` is never used
[INFO] [stdout]   --> src/rectangles.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn rectangles() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]   --> src/rectangles.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn area(width: u32, height: u32) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area2` is never used
[INFO] [stdout]   --> src/rectangles.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn area2(dimensions: (u32, u32)) -> u32{
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area3` is never used
[INFO] [stdout]   --> src/rectangles.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn area3(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind` is never used
[INFO] [stdout]  --> src/enums.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum IpAddrKind {
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddr2` is never used
[INFO] [stdout]  --> src/enums.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum IpAddr2 {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/enums.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/enums.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl Message {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 22 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddr` is never constructed
[INFO] [stdout]   --> src/enums.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct IpAddr {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `enums` is never used
[INFO] [stdout]   --> src/enums.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn enums() {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `route` is never used
[INFO] [stdout]   --> src/enums.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn route(ip_kind: IpAddrKind) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `matches` is never used
[INFO] [stdout]  --> src/matches.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn matches() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]  --> src/matches.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 7 | enum UsState {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> src/matches.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `value_in_cent` is never used
[INFO] [stdout]   --> src/matches.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn value_in_cent(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_one` is never used
[INFO] [stdout]   --> src/matches.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `iflets` is never used
[INFO] [stdout]  --> src/iflets.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn iflets() {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SpreadSheetCell` is never used
[INFO] [stdout]  --> src/vectors.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum SpreadSheetCell {
[INFO] [stdout]   |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vectors` is never used
[INFO] [stdout]  --> src/vectors.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn vectors() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `strings` is never used
[INFO] [stdout]  --> src/strings.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn strings() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hash_maps` is never used
[INFO] [stdout]  --> src/hash_maps.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn hash_maps() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `exercise_1` is never used
[INFO] [stdout]   --> src/hash_maps.rs:64:4
[INFO] [stdout]    |
[INFO] [stdout] 64 | fn exercise_1(list: &mut Vec<i32>) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pig_latin` is never used
[INFO] [stdout]    --> src/hash_maps.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn pig_latin(string: &String) {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_staff` is never used
[INFO] [stdout]    --> src/hash_maps.rs:115:4
[INFO] [stdout]     |
[INFO] [stdout] 115 | fn add_staff() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `enter_console` is never used
[INFO] [stdout]    --> src/hash_maps.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn enter_console(string: String) -> String {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `errors` is never used
[INFO] [stdout]  --> src/errors.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn errors() {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]   --> src/errors.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file2` is never used
[INFO] [stdout]   --> src/errors.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn read_username_from_file2() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file3` is never used
[INFO] [stdout]   --> src/errors.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn read_username_from_file3() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file4` is never used
[INFO] [stdout]   --> src/errors.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn read_username_from_file4() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generics` is never used
[INFO] [stdout]  --> src/generics.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn generics() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_i32` is never used
[INFO] [stdout]   --> src/generics.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn largest_i32(list: &[i32]) -> &i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_char` is never used
[INFO] [stdout]   --> src/generics.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn largest_char(list: &[char]) -> &char {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `traits` is never used
[INFO] [stdout]  --> src/traits.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn traits() {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `summarize` is never used
[INFO] [stdout]  --> src/aggregator.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub trait Summary {
[INFO] [stdout]   |           ------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 8 |     fn summarize(&self) -> String {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/aggregator.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct NewsArticle {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 17 |     pub content:String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/aggregator.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 31 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify` is never used
[INFO] [stdout]   --> src/aggregator.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn notify(item: &impl Summary) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_2` is never used
[INFO] [stdout]   --> src/aggregator.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub fn notify_2<T: Summary>(item: &T) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_3` is never used
[INFO] [stdout]   --> src/aggregator.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn notify_3(item: &impl Summary, item2: &impl Summary) {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_4` is never used
[INFO] [stdout]   --> src/aggregator.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub fn notify_4<T: Summary>(item1: &T, item2: &T) {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_5` is never used
[INFO] [stdout]   --> src/aggregator.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub fn notify_5(item: &(impl Summary + Display)) {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify_6` is never used
[INFO] [stdout]   --> src/aggregator.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 63 | pub fn notify_6<T: Summary + Display>(item: &T) {}
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function` is never used
[INFO] [stdout]   --> src/aggregator.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub fn some_function<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function2` is never used
[INFO] [stdout]   --> src/aggregator.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn some_function2<T, U>(t: &T, u: &U) -> i32
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `returns_summarize` is never used
[INFO] [stdout]   --> src/aggregator.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 | pub fn returns_summarize() -> impl Summary {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ImportantExcerpt` is never constructed
[INFO] [stdout]  --> src/lifetimes.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct ImportantExcerpt<'a> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lifetimes` is never used
[INFO] [stdout]  --> src/lifetimes.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn lifetimes() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]   --> src/lifetimes.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {     // возвращаемая ссылка будет действительна до тех пор, пока валидны оба параме...
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/closures.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ShirtColor` is never used
[INFO] [stdout]   --> src/closures.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum ShirtColor {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Inventory` is never constructed
[INFO] [stdout]   --> src/closures.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Inventory {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `giveaway` and `most_stocked` are never used
[INFO] [stdout]   --> src/closures.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl Inventory {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 21 |     fn giveaway(&self, user_preference: Option<ShirtColor>) -> ShirtColor { // user_preference - необязательный параметр, выбор цвета пол...
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn most_stocked(&self) -> ShirtColor {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `closures` is never used
[INFO] [stdout]   --> src/closures.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn closures() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `capturing` is never used
[INFO] [stdout]    --> src/closures.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn capturing() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 149 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "bf39e482b6620334c8bcc5bd7554331f0889514427965e01763096d20df9d01a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf39e482b6620334c8bcc5bd7554331f0889514427965e01763096d20df9d01a", kill_on_drop: false }`
[INFO] [stdout] bf39e482b6620334c8bcc5bd7554331f0889514427965e01763096d20df9d01a