[INFO] cloning repository https://github.com/luxleo/rust_book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/luxleo/rust_book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluxleo%2Frust_book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluxleo%2Frust_book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a1bf8e69308fa68a1a2ee6ffc7723136c4ae9dfd
[INFO] checking luxleo/rust_book against try#fc545c6b951a304df08b327c158f92678582f435 for pr-140557
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluxleo%2Frust_book" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/luxleo/rust_book on toolchain fc545c6b951a304df08b327c158f92678582f435
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fc545c6b951a304df08b327c158f92678582f435" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/luxleo/rust_book
[INFO] finished tweaking git repo https://github.com/luxleo/rust_book
[INFO] tweaked toml for git repo https://github.com/luxleo/rust_book written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/luxleo/rust_book 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" "+fc545c6b951a304df08b327c158f92678582f435" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+fc545c6b951a304df08b327c158f92678582f435" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 853cd4eec91bcedc8674edb03dc40e44c14cb1d0bc8d289ee0259e29e4cc8bde
[INFO] running `Command { std: "docker" "start" "-a" "853cd4eec91bcedc8674edb03dc40e44c14cb1d0bc8d289ee0259e29e4cc8bde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "853cd4eec91bcedc8674edb03dc40e44c14cb1d0bc8d289ee0259e29e4cc8bde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "853cd4eec91bcedc8674edb03dc40e44c14cb1d0bc8d289ee0259e29e4cc8bde", kill_on_drop: false }`
[INFO] [stdout] 853cd4eec91bcedc8674edb03dc40e44c14cb1d0bc8d289ee0259e29e4cc8bde
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+fc545c6b951a304df08b327c158f92678582f435" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f0fa4d4ca1c7bd3b1f1584cca422344cce1a8a4fcc84361de7c1a74407ff5643
[INFO] running `Command { std: "docker" "start" "-a" "f0fa4d4ca1c7bd3b1f1584cca422344cce1a8a4fcc84361de7c1a74407ff5643", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.171
[INFO] [stderr]    Compiling zerocopy v0.8.24
[INFO] [stderr]    Compiling getrandom v0.3.2
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking rand_core v0.9.3
[INFO] [stderr]     Checking ppv-lite86 v0.2.21
[INFO] [stderr]     Checking rand_chacha v0.9.0
[INFO] [stderr]     Checking rand v0.9.0
[INFO] [stderr]     Checking rust-book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> src/chap3/b_data_types.rs:13:19
[INFO] [stdout]    |
[INFO] [stdout] 13 |                 if( num < 1 || num > 3) {
[INFO] [stdout]    |                   ^^                  ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 13 -                 if( num < 1 || num > 3) {
[INFO] [stdout] 13 +                 if num < 1 || num > 3 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/chap3/e_control_flow.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::io::Read;
[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/chap3/e_control_flow.rs:29:16
[INFO] [stdout]    |
[INFO] [stdout] 29 |             if (pos.0 == 2 && pos.1 == 2) {
[INFO] [stdout]    |                ^                        ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 29 -             if (pos.0 == 2 && pos.1 == 2) {
[INFO] [stdout] 29 +             if pos.0 == 2 && pos.1 == 2 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/chap3/e_control_flow.rs:50:14
[INFO] [stdout]    |
[INFO] [stdout] 50 |     for i in (1..5) {
[INFO] [stdout]    |              ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 50 -     for i in (1..5) {
[INFO] [stdout] 50 +     for i in 1..5 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/chap3/e_control_flow.rs:127:16
[INFO] [stdout]     |
[INFO] [stdout] 127 |     for num in (2..x+1){
[INFO] [stdout]     |                ^      ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 127 -     for num in (2..x+1){
[INFO] [stdout] 127 +     for num in 2..x+1 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::arch::x86_64::_mm256_castsi256_si128`
[INFO] [stdout]  --> src/chap4/a_what_is_ownership.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::arch::x86_64::_mm256_castsi256_si128;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> src/chap3/b_data_types.rs:13:19
[INFO] [stdout]    |
[INFO] [stdout] 13 |                 if( num < 1 || num > 3) {
[INFO] [stdout]    |                   ^^                  ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 13 -                 if( num < 1 || num > 3) {
[INFO] [stdout] 13 +                 if num < 1 || num > 3 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]  --> src/chap3/e_control_flow.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::io::Read;
[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/chap3/e_control_flow.rs:29:16
[INFO] [stdout]    |
[INFO] [stdout] 29 |             if (pos.0 == 2 && pos.1 == 2) {
[INFO] [stdout]    |                ^                        ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 29 -             if (pos.0 == 2 && pos.1 == 2) {
[INFO] [stdout] 29 +             if pos.0 == 2 && pos.1 == 2 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/chap3/e_control_flow.rs:50:14
[INFO] [stdout]    |
[INFO] [stdout] 50 |     for i in (1..5) {
[INFO] [stdout]    |              ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 50 -     for i in (1..5) {
[INFO] [stdout] 50 +     for i in 1..5 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]    --> src/chap3/e_control_flow.rs:127:16
[INFO] [stdout]     |
[INFO] [stdout] 127 |     for num in (2..x+1){
[INFO] [stdout]     |                ^      ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 127 -     for num in (2..x+1){
[INFO] [stdout] 127 +     for num in 2..x+1 {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::arch::x86_64::_mm256_castsi256_si128`
[INFO] [stdout]  --> src/chap4/a_what_is_ownership.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::arch::x86_64::_mm256_castsi256_si128;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/chap3/a_variables_and_mutability.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut x = 5;
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/chap3/a_variables_and_mutability.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let mut x = 10;
[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/chap3/a_variables_and_mutability.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let mut x = 3;
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/chap3/c_functions.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let x = {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chaos`
[INFO] [stdout]  --> src/chap3/e_control_flow.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let chaos = if number > 0 { "positive" } else { "negative" };
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_chaos`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `acc`
[INFO] [stdout]   --> src/chap3/e_control_flow.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let acc = loop {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_acc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let s = String::from("hello");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let r1 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let r2 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:50:11
[INFO] [stdout]    |
[INFO] [stdout] 50 |     { let r1 = &mut s; }
[INFO] [stdout]    |           ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let r2 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r3`
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let r3 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]   --> src/chap4/c_slice_type.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let word = first_word_len(&s); // word will get the value 5
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u2`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let u2 = User {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_u2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:39:15
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let Point(x,y,z) =p;
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:39:17
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let Point(x,y,z) =p;
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:39:19
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let Point(x,y,z) =p;
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:40:15
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let Color(r,g,b) = c;
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:40:17
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let Color(r,g,b) = c;
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let Color(r,g,b) = c;
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/chap5/c_method_syntax.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut s2 = Rectangle::new(10, 5);
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/chap6/a_defining_an_enum.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let x : u8 = 255;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/chap6/a_defining_an_enum.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let y : Option<u8> = Some(1);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `human`
[INFO] [stdout]  --> src/chap7/war.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let human = Human::new(Race::Asian, String::from("Lee"), 10);
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_human`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/chap8/a_storing_lists_of_value.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let v=vec![Block::Float(1.1), Block::Integer(1), Block::Text(String::from("Hello"))];
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `does_not_exist`
[INFO] [stdout]   --> src/chap8/a_storing_lists_of_value.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let does_not_exist : Option<&i32> = v.get(100); // will return None
[INFO] [stdout]    |         ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exist`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]  --> src/chap8/b_utf8_enocoded_string.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let s1 = String::new();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/chap8/b_utf8_enocoded_string.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let s2 = "string literal".to_string();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/chap8/b_utf8_enocoded_string.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     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: `score`
[INFO] [stdout]   --> src/chap8/c_storing_key_value_with_hashmap.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let score = scores.get(&team_name).copied().unwrap_or(0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/chap3/a_variables_and_mutability.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut x = 5;
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/chap3/a_variables_and_mutability.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let mut x = 10;
[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/chap3/a_variables_and_mutability.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let mut x = 3;
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/chap3/c_functions.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let x = {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chaos`
[INFO] [stdout]  --> src/chap3/e_control_flow.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let chaos = if number > 0 { "positive" } else { "negative" };
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_chaos`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `acc`
[INFO] [stdout]   --> src/chap3/e_control_flow.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let acc = loop {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_acc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variables_and_mutability_1` is never used
[INFO] [stdout]  --> src/chap3/a_variables_and_mutability.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn variables_and_mutability_1() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variables_and_mutability_2` is never used
[INFO] [stdout]  --> src/chap3/a_variables_and_mutability.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn variables_and_mutability_2() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `THREE_HOURS_IN_SECONDS` is never used
[INFO] [stdout]   --> src/chap3/a_variables_and_mutability.rs:22:7
[INFO] [stdout]    |
[INFO] [stdout] 22 | const THREE_HOURS_IN_SECONDS: u32 = 60 * 60 * 3; // const can not accompany with 'mut' keyword'
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let s = String::from("hello");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shadowing` is never used
[INFO] [stdout]   --> src/chap3/a_variables_and_mutability.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn shadowing() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `statement_and_expression` is never used
[INFO] [stdout]  --> src/chap3/c_functions.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn statement_and_expression() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `functions_with_return_value` is never used
[INFO] [stdout]   --> src/chap3/c_functions.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn functions_with_return_value() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `five` is never used
[INFO] [stdout]   --> src/chap3/c_functions.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn five() -> u8 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `if_traits` is never used
[INFO] [stdout]  --> src/chap3/e_control_flow.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn if_traits() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `repetition_with_while` is never used
[INFO] [stdout]   --> src/chap3/e_control_flow.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn repetition_with_while() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fibo_cache` is never used
[INFO] [stdout]    --> src/chap3/e_control_flow.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn fibo_cache(x:u32, cache: &mut HashMap<u32, u128>) -> u128{
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `heap_call_drop_to_clean` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn heap_call_drop_to_clean() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_and_functions` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn ownership_and_functions() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let r1 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let r2 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:50:11
[INFO] [stdout]    |
[INFO] [stdout] 50 |     { let r1 = &mut s; }
[INFO] [stdout]    |           ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn takes_ownership(str: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn makes_copy(val : i32){
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_values_and_scope` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn return_values_and_scope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let r2 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gives_ownership` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:60:4
[INFO] [stdout]    |
[INFO] [stdout] 60 | fn gives_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_and_gives_back` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn takes_and_gives_back(str: String) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_and_get_length` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn takes_and_get_length(str:String) -> (String, usize) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calc_length` is never used
[INFO] [stdout]  --> src/chap4/b_references_and_borrowing.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn calc_length(s : &String) -> usize {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `borrowing_through_reference` is never used
[INFO] [stdout]  --> src/chap4/b_references_and_borrowing.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn borrowing_through_reference() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `valid_change` is never used
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn valid_change() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `invalid_change` is never used
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn invalid_change() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r3`
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |     let r3 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_dangle` is never used
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn no_dangle() -> String {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/chap4/c_slice_type.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn first_word(s : &str) -> &str{
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `age` is never read
[INFO] [stdout]  --> src/chap5/a_defining_and_instantiating_struct.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 4 |     age: u8
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Point(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Color(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `destruct_tuple_struct` is never used
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn destruct_tuple_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `AlwaysEqual` is never constructed
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct AlwaysEqual;
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `normal` is never used
[INFO] [stdout]  --> src/chap5/b_program_using_struct.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn normal() {
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area_normal` is never used
[INFO] [stdout]  --> src/chap5/b_program_using_struct.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn area_normal(width: u16, height: u16)->u16 {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refactoring_with_tuple` is never used
[INFO] [stdout]   --> src/chap5/b_program_using_struct.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn refactoring_with_tuple() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area_tuple` is never used
[INFO] [stdout]   --> src/chap5/b_program_using_struct.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn area_tuple(square : (u32,u32)) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> src/chap5/b_program_using_struct.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Rectangle {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 21 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 22 |     height: u32
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refactoring_with_struct` is never used
[INFO] [stdout]   --> src/chap5/b_program_using_struct.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn refactoring_with_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]   --> src/chap5/b_program_using_struct.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `area` is never used
[INFO] [stdout]   --> src/chap5/c_method_syntax.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 19 |     fn area(self: &Self) -> u32 { // self: &Self === &self
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `V6` is never constructed
[INFO] [stdout]  --> src/chap6/a_defining_an_enum.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum IpAddrKind {
[INFO] [stdout]   |      ---------- variant in this enum
[INFO] [stdout] 2 |     V4(IpV4Addr),
[INFO] [stdout] 3 |     V6(IpV6Addr)
[INFO] [stdout]   |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]   --> src/chap4/c_slice_type.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let word = first_word_len(&s); // word will get the value 5
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/chap6/a_defining_an_enum.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | impl IpV6Addr {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 32 |     fn new(address: String) -> IpV6Addr {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_is_better_than_null` is never used
[INFO] [stdout]   --> src/chap6/a_defining_an_enum.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn option_is_better_than_null() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Asian` is never used
[INFO] [stdout]  --> src/chap6/b_match_control_flow.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Asian {
[INFO] [stdout]   |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `name` is never used
[INFO] [stdout]  --> src/chap6/b_match_control_flow.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl Asian {
[INFO] [stdout]   | ---------- method in this implementation
[INFO] [stdout] 8 |     fn name(&self) -> String {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Skin` is never used
[INFO] [stdout]   --> src/chap6/b_match_control_flow.rs:16:6
[INFO] [stdout]    |
[INFO] [stdout] 16 | enum Skin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `people_skin_color` is never used
[INFO] [stdout]   --> src/chap6/b_match_control_flow.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn people_skin_color(skin: Skin) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_two` is never used
[INFO] [stdout]   --> src/chap6/b_match_control_flow.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn plus_two(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `only_two_and_seven` is never used
[INFO] [stdout]   --> src/chap6/b_match_control_flow.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn only_two_and_seven(x: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `if_let` is never used
[INFO] [stdout]   --> src/chap6/c_concise_flow_with_if_let.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn if_let() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `age` is never read
[INFO] [stdout]  --> src/chap7/human.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Human {
[INFO] [stdout]   |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 8 |     age: u8,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `age` is never used
[INFO] [stdout]   --> src/chap7/human.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl Human {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 14 |     fn age(&self) -> u8{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Block` is never used
[INFO] [stdout]   --> src/chap8/a_storing_lists_of_value.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum Block {
[INFO] [stdout]    |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `put_different_type_using_enum` is never used
[INFO] [stdout]   --> src/chap8/a_storing_lists_of_value.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn put_different_type_using_enum() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ways_to_create_string` is never used
[INFO] [stdout]  --> src/chap8/b_utf8_enocoded_string.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn ways_to_create_string() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UniPoint` is never constructed
[INFO] [stdout]   --> src/chap10/a_generic_data_types.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct UniPoint<T>{
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/chap10/a_generic_data_types.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct Point<T,U>{
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show_x` is never used
[INFO] [stdout]   --> src/chap10/a_generic_data_types.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl<T> UniPoint<T> {
[INFO] [stdout]    | ------------------- method in this implementation
[INFO] [stdout] 25 |     fn show_x(&self) -> &T{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show_float_x` is never used
[INFO] [stdout]   --> src/chap10/a_generic_data_types.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | impl UniPoint<f32> {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] 31 |     fn show_float_x(&self) -> &f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> src/chap3/e_control_flow.rs:64:20
[INFO] [stdout]    |
[INFO] [stdout] 64 |                 if num < 0 {
[INFO] [stdout]    |                    ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> src/chap3/e_control_flow.rs:94:20
[INFO] [stdout]    |
[INFO] [stdout] 94 |                 if num < 0 {
[INFO] [stdout]    |                    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u2`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let u2 = User {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_u2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:39:15
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let Point(x,y,z) =p;
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:39:17
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let Point(x,y,z) =p;
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:39:19
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let Point(x,y,z) =p;
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:40:15
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let Color(r,g,b) = c;
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_r`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:40:17
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let Color(r,g,b) = c;
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let Color(r,g,b) = c;
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/chap5/c_method_syntax.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut s2 = Rectangle::new(10, 5);
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/chap6/a_defining_an_enum.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let x : u8 = 255;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/chap6/a_defining_an_enum.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let y : Option<u8> = Some(1);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `human`
[INFO] [stdout]  --> src/chap7/war.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let human = Human::new(Race::Asian, String::from("Lee"), 10);
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_human`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/chap8/a_storing_lists_of_value.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let v=vec![Block::Float(1.1), Block::Integer(1), Block::Text(String::from("Hello"))];
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `does_not_exist`
[INFO] [stdout]   --> src/chap8/a_storing_lists_of_value.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let does_not_exist : Option<&i32> = v.get(100); // will return None
[INFO] [stdout]    |         ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exist`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]  --> src/chap8/b_utf8_enocoded_string.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let s1 = String::new();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/chap8/b_utf8_enocoded_string.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let s2 = "string literal".to_string();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/chap8/b_utf8_enocoded_string.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     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: `score`
[INFO] [stdout]   --> src/chap8/c_storing_key_value_with_hashmap.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let score = scores.get(&team_name).copied().unwrap_or(0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variables_and_mutability_1` is never used
[INFO] [stdout]  --> src/chap3/a_variables_and_mutability.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn variables_and_mutability_1() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variables_and_mutability_2` is never used
[INFO] [stdout]  --> src/chap3/a_variables_and_mutability.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn variables_and_mutability_2() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `THREE_HOURS_IN_SECONDS` is never used
[INFO] [stdout]   --> src/chap3/a_variables_and_mutability.rs:22:7
[INFO] [stdout]    |
[INFO] [stdout] 22 | const THREE_HOURS_IN_SECONDS: u32 = 60 * 60 * 3; // const can not accompany with 'mut' keyword'
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shadowing` is never used
[INFO] [stdout]   --> src/chap3/a_variables_and_mutability.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn shadowing() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `statement_and_expression` is never used
[INFO] [stdout]  --> src/chap3/c_functions.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn statement_and_expression() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `functions_with_return_value` is never used
[INFO] [stdout]   --> src/chap3/c_functions.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn functions_with_return_value() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `five` is never used
[INFO] [stdout]   --> src/chap3/c_functions.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn five() -> u8 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `if_traits` is never used
[INFO] [stdout]  --> src/chap3/e_control_flow.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn if_traits() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `repetition_with_while` is never used
[INFO] [stdout]   --> src/chap3/e_control_flow.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn repetition_with_while() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fibo_cache` is never used
[INFO] [stdout]    --> src/chap3/e_control_flow.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn fibo_cache(x:u32, cache: &mut HashMap<u32, u128>) -> u128{
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `heap_call_drop_to_clean` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn heap_call_drop_to_clean() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_and_functions` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn ownership_and_functions() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn takes_ownership(str: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn makes_copy(val : i32){
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_values_and_scope` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn return_values_and_scope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gives_ownership` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:60:4
[INFO] [stdout]    |
[INFO] [stdout] 60 | fn gives_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_and_gives_back` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn takes_and_gives_back(str: String) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_and_get_length` is never used
[INFO] [stdout]   --> src/chap4/a_what_is_ownership.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn takes_and_get_length(str:String) -> (String, usize) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calc_length` is never used
[INFO] [stdout]  --> src/chap4/b_references_and_borrowing.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn calc_length(s : &String) -> usize {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `borrowing_through_reference` is never used
[INFO] [stdout]  --> src/chap4/b_references_and_borrowing.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn borrowing_through_reference() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `valid_change` is never used
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn valid_change() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `invalid_change` is never used
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn invalid_change() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_dangle` is never used
[INFO] [stdout]   --> src/chap4/b_references_and_borrowing.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn no_dangle() -> String {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/chap4/c_slice_type.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn first_word(s : &str) -> &str{
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `age` is never read
[INFO] [stdout]  --> src/chap5/a_defining_and_instantiating_struct.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 4 |     age: u8
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Point(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Color(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `destruct_tuple_struct` is never used
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn destruct_tuple_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `AlwaysEqual` is never constructed
[INFO] [stdout]   --> src/chap5/a_defining_and_instantiating_struct.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct AlwaysEqual;
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `normal` is never used
[INFO] [stdout]  --> src/chap5/b_program_using_struct.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn normal() {
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area_normal` is never used
[INFO] [stdout]  --> src/chap5/b_program_using_struct.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn area_normal(width: u16, height: u16)->u16 {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refactoring_with_tuple` is never used
[INFO] [stdout]   --> src/chap5/b_program_using_struct.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn refactoring_with_tuple() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area_tuple` is never used
[INFO] [stdout]   --> src/chap5/b_program_using_struct.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn area_tuple(square : (u32,u32)) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `width` and `height` are never read
[INFO] [stdout]   --> src/chap5/b_program_using_struct.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Rectangle {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 21 |     width: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 22 |     height: u32
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refactoring_with_struct` is never used
[INFO] [stdout]   --> src/chap5/b_program_using_struct.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn refactoring_with_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]   --> src/chap5/b_program_using_struct.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `area` is never used
[INFO] [stdout]   --> src/chap5/c_method_syntax.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl Rectangle {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 19 |     fn area(self: &Self) -> u32 { // self: &Self === &self
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `V6` is never constructed
[INFO] [stdout]  --> src/chap6/a_defining_an_enum.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum IpAddrKind {
[INFO] [stdout]   |      ---------- variant in this enum
[INFO] [stdout] 2 |     V4(IpV4Addr),
[INFO] [stdout] 3 |     V6(IpV6Addr)
[INFO] [stdout]   |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/chap6/a_defining_an_enum.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | impl IpV6Addr {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 32 |     fn new(address: String) -> IpV6Addr {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_is_better_than_null` is never used
[INFO] [stdout]   --> src/chap6/a_defining_an_enum.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn option_is_better_than_null() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Asian` is never used
[INFO] [stdout]  --> src/chap6/b_match_control_flow.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Asian {
[INFO] [stdout]   |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `name` is never used
[INFO] [stdout]  --> src/chap6/b_match_control_flow.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl Asian {
[INFO] [stdout]   | ---------- method in this implementation
[INFO] [stdout] 8 |     fn name(&self) -> String {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Skin` is never used
[INFO] [stdout]   --> src/chap6/b_match_control_flow.rs:16:6
[INFO] [stdout]    |
[INFO] [stdout] 16 | enum Skin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `people_skin_color` is never used
[INFO] [stdout]   --> src/chap6/b_match_control_flow.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn people_skin_color(skin: Skin) -> String{
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_two` is never used
[INFO] [stdout]   --> src/chap6/b_match_control_flow.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn plus_two(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `only_two_and_seven` is never used
[INFO] [stdout]   --> src/chap6/b_match_control_flow.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn only_two_and_seven(x: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `if_let` is never used
[INFO] [stdout]   --> src/chap6/c_concise_flow_with_if_let.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn if_let() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `age` is never read
[INFO] [stdout]  --> src/chap7/human.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Human {
[INFO] [stdout]   |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 8 |     age: u8,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `age` is never used
[INFO] [stdout]   --> src/chap7/human.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl Human {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 14 |     fn age(&self) -> u8{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Block` is never used
[INFO] [stdout]   --> src/chap8/a_storing_lists_of_value.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum Block {
[INFO] [stdout]    |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `put_different_type_using_enum` is never used
[INFO] [stdout]   --> src/chap8/a_storing_lists_of_value.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn put_different_type_using_enum() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ways_to_create_string` is never used
[INFO] [stdout]  --> src/chap8/b_utf8_enocoded_string.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn ways_to_create_string() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UniPoint` is never constructed
[INFO] [stdout]   --> src/chap10/a_generic_data_types.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct UniPoint<T>{
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/chap10/a_generic_data_types.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct Point<T,U>{
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show_x` is never used
[INFO] [stdout]   --> src/chap10/a_generic_data_types.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl<T> UniPoint<T> {
[INFO] [stdout]    | ------------------- method in this implementation
[INFO] [stdout] 25 |     fn show_x(&self) -> &T{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `show_float_x` is never used
[INFO] [stdout]   --> src/chap10/a_generic_data_types.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | impl UniPoint<f32> {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] 31 |     fn show_float_x(&self) -> &f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point2D` is never constructed
[INFO] [stdout]   --> src/chap10/a_generic_data_types.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | struct Point2D<X1,Y1>{
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mix_up` is never used
[INFO] [stdout]   --> src/chap10/a_generic_data_types.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | impl<X1,Y1> Point2D<X1,Y1>{
[INFO] [stdout]    | -------------------------- method in this implementation
[INFO] [stdout] 43 |     fn mix_up<X2,Y2>(self, other: Point2D<X2,Y2>) -> Point2D<X1,Y2>{
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> src/chap3/e_control_flow.rs:64:20
[INFO] [stdout]    |
[INFO] [stdout] 64 |                 if num < 0 {
[INFO] [stdout]    |                    ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]   --> src/chap3/e_control_flow.rs:94:20
[INFO] [stdout]    |
[INFO] [stdout] 94 |                 if num < 0 {
[INFO] [stdout]    |                    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap2::guess::run_game`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rust_book::chap2::guess::run_game;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap3::a_variables_and_mutability::execute`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rust_book::chap3::a_variables_and_mutability::execute;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap3::b_data_types::tuple_types`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_book::chap3::b_data_types::tuple_types;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `fibo_cache_client`, `fibo_client`, `repetition_with_for`, and `repetition_with_loop`
[INFO] [stdout]  --> src/main.rs:4:40
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rust_book::chap3::e_control_flow::{fibo_cache_client, fibo_client, repetition_with_for, repetition_with_loop};
[INFO] [stdout]   |                                        ^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap4::a_what_is_ownership::heap_data`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use rust_book::chap4::a_what_is_ownership::heap_data;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `valid_change_with_multiple_mutable_references1`, `valid_change_with_multiple_mutable_references2`, and `valid_multiple_references`
[INFO] [stdout]  --> src/main.rs:6:52
[INFO] [stdout]   |
[INFO] [stdout] 6 | ...ing::{valid_change_with_multiple_mutable_references2, valid_change_with_multiple_mutable_references1, valid_multiple_references};
[INFO] [stdout]   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `invalid_length` and `show_sliced_array`
[INFO] [stdout]  --> src/main.rs:7:38
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rust_book::chap4::c_slice_type::{invalid_length, show_sliced_array};
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap5::b_program_using_struct::show_rect`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use rust_book::chap5::b_program_using_struct::show_rect;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap5::c_method_syntax::method_test`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use rust_book::chap5::c_method_syntax::method_test;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap6::a_defining_an_enum::show_enum`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rust_book::chap6::a_defining_an_enum::show_enum;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `get_element_test`, `prac_iter_vector`, `update_vector`, and `vector_define`
[INFO] [stdout]   --> src/main.rs:11:50
[INFO] [stdout]    |
[INFO] [stdout] 11 | use rust_book::chap8::a_storing_lists_of_value::{get_element_test, prac_iter_vector, update_vector, vector_define};
[INFO] [stdout]    |                                                  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `indexing_string` and `update_string`
[INFO] [stdout]   --> src/main.rs:12:48
[INFO] [stdout]    |
[INFO] [stdout] 12 | use rust_book::chap8::b_utf8_enocoded_string::{indexing_string, update_string};
[INFO] [stdout]    |                                                ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `create_and_access`
[INFO] [stdout]   --> src/main.rs:13:58
[INFO] [stdout]    |
[INFO] [stdout] 13 | use rust_book::chap8::c_storing_key_value_with_hashmap::{create_and_access, update_test};
[INFO] [stdout]    |                                                          ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap2::guess::run_game`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rust_book::chap2::guess::run_game;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap3::a_variables_and_mutability::execute`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rust_book::chap3::a_variables_and_mutability::execute;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap3::b_data_types::tuple_types`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rust_book::chap3::b_data_types::tuple_types;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `fibo_cache_client`, `fibo_client`, `repetition_with_for`, and `repetition_with_loop`
[INFO] [stdout]  --> src/main.rs:4:40
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rust_book::chap3::e_control_flow::{fibo_cache_client, fibo_client, repetition_with_for, repetition_with_loop};
[INFO] [stdout]   |                                        ^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap4::a_what_is_ownership::heap_data`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use rust_book::chap4::a_what_is_ownership::heap_data;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `valid_change_with_multiple_mutable_references1`, `valid_change_with_multiple_mutable_references2`, and `valid_multiple_references`
[INFO] [stdout]  --> src/main.rs:6:52
[INFO] [stdout]   |
[INFO] [stdout] 6 | ...ing::{valid_change_with_multiple_mutable_references2, valid_change_with_multiple_mutable_references1, valid_multiple_references};
[INFO] [stdout]   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `invalid_length` and `show_sliced_array`
[INFO] [stdout]  --> src/main.rs:7:38
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rust_book::chap4::c_slice_type::{invalid_length, show_sliced_array};
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap5::b_program_using_struct::show_rect`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use rust_book::chap5::b_program_using_struct::show_rect;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap5::c_method_syntax::method_test`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use rust_book::chap5::c_method_syntax::method_test;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_book::chap6::a_defining_an_enum::show_enum`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rust_book::chap6::a_defining_an_enum::show_enum;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `get_element_test`, `prac_iter_vector`, `update_vector`, and `vector_define`
[INFO] [stdout]   --> src/main.rs:11:50
[INFO] [stdout]    |
[INFO] [stdout] 11 | use rust_book::chap8::a_storing_lists_of_value::{get_element_test, prac_iter_vector, update_vector, vector_define};
[INFO] [stdout]    |                                                  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `indexing_string` and `update_string`
[INFO] [stdout]   --> src/main.rs:12:48
[INFO] [stdout]    |
[INFO] [stdout] 12 | use rust_book::chap8::b_utf8_enocoded_string::{indexing_string, update_string};
[INFO] [stdout]    |                                                ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `create_and_access`
[INFO] [stdout]   --> src/main.rs:13:58
[INFO] [stdout]    |
[INFO] [stdout] 13 | use rust_book::chap8::c_storing_key_value_with_hashmap::{create_and_access, update_test};
[INFO] [stdout]    |                                                          ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.74s
[INFO] running `Command { std: "docker" "inspect" "f0fa4d4ca1c7bd3b1f1584cca422344cce1a8a4fcc84361de7c1a74407ff5643", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0fa4d4ca1c7bd3b1f1584cca422344cce1a8a4fcc84361de7c1a74407ff5643", kill_on_drop: false }`
[INFO] [stdout] f0fa4d4ca1c7bd3b1f1584cca422344cce1a8a4fcc84361de7c1a74407ff5643