[INFO] updating cached repository Ryan-Git/learn-rust [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/Ryan-Git/learn-rust [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/Ryan-Git/learn-rust" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/Ryan-Git/learn-rust"` [INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/Ryan-Git/learn-rust'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/Ryan-Git/learn-rust" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/Ryan-Git/learn-rust"` [INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/Ryan-Git/learn-rust'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] f57e9ba8bc8c765e7db76e3e85e13bb9764da7b7 [INFO] sha for GitHub repo Ryan-Git/learn-rust: f57e9ba8bc8c765e7db76e3e85e13bb9764da7b7 [INFO] validating manifest of Ryan-Git/learn-rust on toolchain master#a850a426491e14186af2250549bf41256b5938d2 [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of Ryan-Git/learn-rust on toolchain try#06a150c7d11500b41499224f165e9de1de096768 [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing Ryan-Git/learn-rust [INFO] finished frobbing Ryan-Git/learn-rust [INFO] frobbed toml for Ryan-Git/learn-rust written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/Ryan-Git/learn-rust/Cargo.toml [INFO] started frobbing Ryan-Git/learn-rust [INFO] finished frobbing Ryan-Git/learn-rust [INFO] frobbed toml for Ryan-Git/learn-rust written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/Ryan-Git/learn-rust/Cargo.toml [INFO] crate Ryan-Git/learn-rust already has a lockfile, it will not be regenerated [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] checking Ryan-Git/learn-rust against master#a850a426491e14186af2250549bf41256b5938d2 for pr-60162 [INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-1/master#a850a426491e14186af2250549bf41256b5938d2:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/Ryan-Git/learn-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "check" "--frozen" "--all" "--all-targets"` [INFO] [stdout] d922b7e46aecff1a85e7b629f77cd46e005cd58e99bbd22efb9943a0b0ae1898 [INFO] running `"docker" "start" "-a" "d922b7e46aecff1a85e7b629f77cd46e005cd58e99bbd22efb9943a0b0ae1898"` [INFO] [stderr] Checking learn-rust v0.1.0 (/opt/crater/workdir) [INFO] [stderr] warning: unused imports: `Cons`, `Nil` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_4_rc.rs:11:18 [INFO] [stderr] | [INFO] [stderr] 11 | use self::List::{Cons, Nil}; [INFO] [stderr] | ^^^^ ^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_imports)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused imports: `Cons`, `Nil` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_5_ref_cell.rs:41:18 [INFO] [stderr] | [INFO] [stderr] 41 | use self::List::{Cons, Nil}; [INFO] [stderr] | ^^^^ ^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::thread` [INFO] [stderr] --> src/ch16_concurrency/ch16_1_threads.rs:1:5 [INFO] [stderr] | [INFO] [stderr] 1 | use std::thread; [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::sync::mpsc` [INFO] [stderr] --> src/ch16_concurrency/ch16_2_message_passing.rs:1:5 [INFO] [stderr] | [INFO] [stderr] 1 | use std::sync::mpsc; [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::thread` [INFO] [stderr] --> src/ch16_concurrency/ch16_2_message_passing.rs:2:5 [INFO] [stderr] | [INFO] [stderr] 2 | use std::thread; [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::time::Duration` [INFO] [stderr] --> src/ch16_concurrency/ch16_2_message_passing.rs:3:5 [INFO] [stderr] | [INFO] [stderr] 3 | use std::time::Duration; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused imports: `Arc`, `Mutex` [INFO] [stderr] --> src/ch16_concurrency/ch16_3_shared_state.rs:1:17 [INFO] [stderr] | [INFO] [stderr] 1 | use std::sync::{Mutex, Arc}; [INFO] [stderr] | ^^^^^ ^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::thread` [INFO] [stderr] --> src/ch16_concurrency/ch16_3_shared_state.rs:2:5 [INFO] [stderr] | [INFO] [stderr] 2 | use std::thread; [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::rc::Rc` [INFO] [stderr] --> src/ch16_concurrency/ch16_3_shared_state.rs:3:5 [INFO] [stderr] | [INFO] [stderr] 3 | use std::rc::Rc; [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::io` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | use std::io; [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::rc::Rc` [INFO] [stderr] --> src/ch16_concurrency/ch16_3_shared_state.rs:3:5 [INFO] [stderr] | [INFO] [stderr] 3 | use std::rc::Rc; [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_imports)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::io` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | use std::io; [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused variable: `ip_type` [INFO] [stderr] --> src/ch6_enums.rs:53:10 [INFO] [stderr] | [INFO] [stderr] 53 | fn route(ip_type: IpAddrKind) {} [INFO] [stderr] | ^^^^^^^ help: consider prefixing with an underscore: `_ip_type` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_variables)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:113:58 [INFO] [stderr] | [INFO] [stderr] 113 | fn some_function(t: T, u: U) -> i32 { [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `u` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:113:64 [INFO] [stderr] | [INFO] [stderr] 113 | fn some_function(t: T, u: U) -> i32 { [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_u` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:117:25 [INFO] [stderr] | [INFO] [stderr] 117 | fn some_function2(t: T, u: U) -> i32 [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `u` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:117:31 [INFO] [stderr] | [INFO] [stderr] 117 | fn some_function2(t: T, u: U) -> i32 [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_u` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c1` [INFO] [stderr] --> src/ch14_cargo_crates.rs:37:16 [INFO] [stderr] | [INFO] [stderr] 37 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_c1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c2` [INFO] [stderr] --> src/ch14_cargo_crates.rs:37:34 [INFO] [stderr] | [INFO] [stderr] 37 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_c2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `post` [INFO] [stderr] --> src/ch17_oop/mod.rs:184:27 [INFO] [stderr] | [INFO] [stderr] 184 | fn content<'a>(&self, post: &'a Post) -> &'a str { [INFO] [stderr] | ^^^^ help: consider prefixing with an underscore: `_post` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `content` [INFO] [stderr] --> src/ch17_oop/mod.rs:188:24 [INFO] [stderr] | [INFO] [stderr] 188 | fn add_text(&self, content: &mut String, text: &str) {} [INFO] [stderr] | ^^^^^^^ help: consider prefixing with an underscore: `_content` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `text` [INFO] [stderr] --> src/ch17_oop/mod.rs:188:46 [INFO] [stderr] | [INFO] [stderr] 188 | fn add_text(&self, content: &mut String, text: &str) {} [INFO] [stderr] | ^^^^ help: consider prefixing with an underscore: `_text` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/ch18_pattern_match.rs:245:8 [INFO] [stderr] | [INFO] [stderr] 245 | fn foo(x: i32) { [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `graph` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:19:37 [INFO] [stderr] | [INFO] [stderr] 19 | fn gDistance>(graph: &G, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_graph` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `start` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:19:48 [INFO] [stderr] | [INFO] [stderr] 19 | fn gDistance>(graph: &G, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_start` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `end` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:19:59 [INFO] [stderr] | [INFO] [stderr] 19 | fn gDistance>(graph: &G, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^ help: consider prefixing with an underscore: `_end` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `graph` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:28:25 [INFO] [stderr] | [INFO] [stderr] 28 | fn aDistance(graph: &G, start: &G::Node, end: &G::Node) -> u32 { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_graph` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `start` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:28:36 [INFO] [stderr] | [INFO] [stderr] 28 | fn aDistance(graph: &G, start: &G::Node, end: &G::Node) -> u32 { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_start` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `end` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:28:53 [INFO] [stderr] | [INFO] [stderr] 28 | fn aDistance(graph: &G, start: &G::Node, end: &G::Node) -> u32 { [INFO] [stderr] | ^^^ help: consider prefixing with an underscore: `_end` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `graph` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:33:19 [INFO] [stderr] | [INFO] [stderr] 33 | fn distance(graph: &GGraph, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_graph` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `start` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:33:41 [INFO] [stderr] | [INFO] [stderr] 33 | fn distance(graph: &GGraph, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_start` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `end` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:33:52 [INFO] [stderr] | [INFO] [stderr] 33 | fn distance(graph: &GGraph, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^ help: consider prefixing with an underscore: `_end` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `graph` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:35:13 [INFO] [stderr] | [INFO] [stderr] 35 | fn traverse(graph: &AGraph) {} [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_graph` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:18:15 [INFO] [stderr] | [INFO] [stderr] 18 | fn generic(t: T){} [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:19:23 [INFO] [stderr] | [INFO] [stderr] 19 | fn generic2(t: T) {} [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:20:24 [INFO] [stderr] | [INFO] [stderr] 20 | fn generic3(t: &T) {} [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: function is never used: `takes_ownership` [INFO] [stderr] --> src/ch4_ownership.rs:105:1 [INFO] [stderr] | [INFO] [stderr] 105 | fn takes_ownership(some_string: String) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(dead_code)] on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `makes_copy` [INFO] [stderr] --> src/ch4_ownership.rs:111:1 [INFO] [stderr] | [INFO] [stderr] 111 | fn makes_copy(some_integer: i32) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `gives_ownership` [INFO] [stderr] --> src/ch4_ownership.rs:116:1 [INFO] [stderr] | [INFO] [stderr] 116 | fn gives_ownership() -> String { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `takes_and_gives_back` [INFO] [stderr] --> src/ch4_ownership.rs:129:1 [INFO] [stderr] | [INFO] [stderr] 129 | fn takes_and_gives_back(a_string: String) -> String { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `calculate_length` [INFO] [stderr] --> src/ch4_ownership.rs:136:1 [INFO] [stderr] | [INFO] [stderr] 136 | fn calculate_length(s: &String) -> usize { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `change` [INFO] [stderr] --> src/ch4_ownership.rs:142:1 [INFO] [stderr] | [INFO] [stderr] 142 | fn change(some_string: &mut String) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Rectangle` [INFO] [stderr] --> src/ch5_rectangle.rs:2:1 [INFO] [stderr] | [INFO] [stderr] 2 | struct Rectangle { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `area` [INFO] [stderr] --> src/ch5_rectangle.rs:8:5 [INFO] [stderr] | [INFO] [stderr] 8 | fn area(&self) -> u32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `can_hold` [INFO] [stderr] --> src/ch5_rectangle.rs:12:5 [INFO] [stderr] | [INFO] [stderr] 12 | fn can_hold(&self, other: &Rectangle) -> bool { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `square` [INFO] [stderr] --> src/ch5_rectangle.rs:17:5 [INFO] [stderr] | [INFO] [stderr] 17 | fn square(size: u32) -> Rectangle { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `area_rec` [INFO] [stderr] --> src/ch5_rectangle.rs:42:1 [INFO] [stderr] | [INFO] [stderr] 42 | fn area_rec(rec: &Rectangle) -> u32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `User` [INFO] [stderr] --> src/ch5_structs.rs:1:1 [INFO] [stderr] | [INFO] [stderr] 1 | struct User { [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Color` [INFO] [stderr] --> src/ch5_structs.rs:9:1 [INFO] [stderr] | [INFO] [stderr] 9 | struct Color(i32, i32, i32); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Point` [INFO] [stderr] --> src/ch5_structs.rs:11:1 [INFO] [stderr] | [INFO] [stderr] 11 | struct Point(i32, i32, i32); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `build_user` [INFO] [stderr] --> src/ch5_structs.rs:34:1 [INFO] [stderr] | [INFO] [stderr] 34 | fn build_user(email: String, username: String) -> User { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `IpAddrKind` [INFO] [stderr] --> src/ch6_enums.rs:1:1 [INFO] [stderr] | [INFO] [stderr] 1 | enum IpAddrKind { [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `UsState` [INFO] [stderr] --> src/ch6_enums.rs:7:1 [INFO] [stderr] | [INFO] [stderr] 7 | enum UsState { [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `Coin` [INFO] [stderr] --> src/ch6_enums.rs:13:1 [INFO] [stderr] | [INFO] [stderr] 13 | enum Coin { [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `value_in_cents` [INFO] [stderr] --> src/ch6_enums.rs:20:1 [INFO] [stderr] | [INFO] [stderr] 20 | fn value_in_cents(coin: Coin) -> u32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `route` [INFO] [stderr] --> src/ch6_enums.rs:53:1 [INFO] [stderr] | [INFO] [stderr] 53 | fn route(ip_type: IpAddrKind) {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `nested_modules` [INFO] [stderr] --> src/ch7_modules.rs:21:13 [INFO] [stderr] | [INFO] [stderr] 21 | pub fn nested_modules() {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `read_username_from_file` [INFO] [stderr] --> src/ch9_error.rs:44:1 [INFO] [stderr] | [INFO] [stderr] 44 | fn read_username_from_file() -> Result { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `read_username_from_file2` [INFO] [stderr] --> src/ch9_error.rs:60:1 [INFO] [stderr] | [INFO] [stderr] 60 | fn read_username_from_file2() -> Result { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `read_username_from_file3` [INFO] [stderr] --> src/ch9_error.rs:67:1 [INFO] [stderr] | [INFO] [stderr] 67 | fn read_username_from_file3() -> Result { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `longest` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:75:1 [INFO] [stderr] | [INFO] [stderr] 75 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `longest_with_an_announcement` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:83:1 [INFO] [stderr] | [INFO] [stderr] 83 | / fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str [INFO] [stderr] 84 | | where T: Display [INFO] [stderr] 85 | | { [INFO] [stderr] 86 | | println!("Announcement! {}", ann); [INFO] [stderr] ... | [INFO] [stderr] 91 | | } [INFO] [stderr] 92 | | } [INFO] [stderr] | |_^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:94:1 [INFO] [stderr] | [INFO] [stderr] 94 | struct ImportantExcerpt<'a> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `level` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:99:5 [INFO] [stderr] | [INFO] [stderr] 99 | fn level(&self) -> i32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `announce_and_return_part` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:103:5 [INFO] [stderr] | [INFO] [stderr] 103 | fn announce_and_return_part(&self, announcement: &str) -> &str { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `notify` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:109:1 [INFO] [stderr] | [INFO] [stderr] 109 | fn notify(item: T) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `some_function` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:113:1 [INFO] [stderr] | [INFO] [stderr] 113 | fn some_function(t: T, u: U) -> i32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `some_function2` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:117:1 [INFO] [stderr] | [INFO] [stderr] 117 | / fn some_function2(t: T, u: U) -> i32 [INFO] [stderr] 118 | | where T: Display + Clone, [INFO] [stderr] 119 | | U: Clone + Display { [INFO] [stderr] 120 | | 1 [INFO] [stderr] 121 | | } [INFO] [stderr] | |_^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `largest` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:123:1 [INFO] [stderr] | [INFO] [stderr] 123 | fn largest(list: &[i32]) -> i32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `largest2` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:135:1 [INFO] [stderr] | [INFO] [stderr] 135 | fn largest2(list: &[T]) -> &T { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Point` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:147:1 [INFO] [stderr] | [INFO] [stderr] 147 | struct Point { [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `x` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:153:5 [INFO] [stderr] | [INFO] [stderr] 153 | fn x(&self) -> &T { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Point2` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:158:1 [INFO] [stderr] | [INFO] [stderr] 158 | struct Point2 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `mixup` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:164:5 [INFO] [stderr] | [INFO] [stderr] 164 | fn mixup(self, other: Point2) -> Point2 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `Option` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:172:1 [INFO] [stderr] | [INFO] [stderr] 172 | enum Option { [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `NewsArticle` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:185:1 [INFO] [stderr] | [INFO] [stderr] 185 | struct NewsArticle { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Tweet` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:198:1 [INFO] [stderr] | [INFO] [stderr] 198 | struct Tweet { [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `add_two` [INFO] [stderr] --> src/ch11_test.rs:20:1 [INFO] [stderr] | [INFO] [stderr] 20 | fn add_two(a: i32) -> i32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Guess` [INFO] [stderr] --> src/ch11_test.rs:24:1 [INFO] [stderr] | [INFO] [stderr] 24 | struct Guess { [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `new` [INFO] [stderr] --> src/ch11_test.rs:29:5 [INFO] [stderr] | [INFO] [stderr] 29 | pub fn new(value: u32) -> Guess { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Rectangle` [INFO] [stderr] --> src/ch11_test.rs:41:1 [INFO] [stderr] | [INFO] [stderr] 41 | pub struct Rectangle { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `can_hold` [INFO] [stderr] --> src/ch11_test.rs:47:5 [INFO] [stderr] | [INFO] [stderr] 47 | pub fn can_hold(&self, other: &Rectangle) -> bool { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Counter` [INFO] [stderr] --> src/ch13_fp.rs:127:1 [INFO] [stderr] | [INFO] [stderr] 127 | struct Counter { [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `new` [INFO] [stderr] --> src/ch13_fp.rs:132:5 [INFO] [stderr] | [INFO] [stderr] 132 | fn new() -> Counter { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `shoes_in_my_size` [INFO] [stderr] --> src/ch13_fp.rs:157:1 [INFO] [stderr] | [INFO] [stderr] 157 | fn shoes_in_my_size(shoes: Vec, shoe_size: i32) -> Vec { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Cacher` [INFO] [stderr] --> src/ch13_fp.rs:177:1 [INFO] [stderr] | [INFO] [stderr] 177 | / struct Cacher [INFO] [stderr] 178 | | where [INFO] [stderr] 179 | | T: Fn(P) -> R, [INFO] [stderr] 180 | | P: std::hash::Hash + Eq + Copy, [INFO] [stderr] ... | [INFO] [stderr] 184 | | result: HashMap, [INFO] [stderr] 185 | | } [INFO] [stderr] | |_^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `new` [INFO] [stderr] --> src/ch13_fp.rs:193:5 [INFO] [stderr] | [INFO] [stderr] 193 | fn new(calculation: T) -> Cacher { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `value` [INFO] [stderr] --> src/ch13_fp.rs:200:5 [INFO] [stderr] | [INFO] [stderr] 200 | fn value(&mut self, arg: P) -> R { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `List` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_1_box.rs:8:1 [INFO] [stderr] | [INFO] [stderr] 8 | enum List { [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Mp3` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_1_box.rs:24:1 [INFO] [stderr] | [INFO] [stderr] 24 | struct Mp3 { [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `CustomSmartPointer` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_1_box.rs:72:1 [INFO] [stderr] | [INFO] [stderr] 72 | struct CustomSmartPointer { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `List` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_4_rc.rs:6:1 [INFO] [stderr] | [INFO] [stderr] 6 | enum List { [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `a_fn_that_immutably_borrows` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_5_ref_cell.rs:6:1 [INFO] [stderr] | [INFO] [stderr] 6 | fn a_fn_that_immutably_borrows(a: &i32){ [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `a_fn_that_mutably_borrows` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_5_ref_cell.rs:10:1 [INFO] [stderr] | [INFO] [stderr] 10 | fn a_fn_that_mutably_borrows(b: &mut i32){ [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `demo` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_5_ref_cell.rs:14:1 [INFO] [stderr] | [INFO] [stderr] 14 | fn demo(r: &RefCell){ [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `List` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_5_ref_cell.rs:36:1 [INFO] [stderr] | [INFO] [stderr] 36 | enum List { [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `List` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_6_ref_cycle.rs:2:1 [INFO] [stderr] | [INFO] [stderr] 2 | enum List { [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `tail` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_6_ref_cycle.rs:8:5 [INFO] [stderr] | [INFO] [stderr] 8 | fn tail(&self) -> Option<&RefCell>> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Node` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_6_ref_cycle.rs:47:1 [INFO] [stderr] | [INFO] [stderr] 47 | struct Node { [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `AveragedCollection` [INFO] [stderr] --> src/ch17_oop/mod.rs:2:1 [INFO] [stderr] | [INFO] [stderr] 2 | pub struct AveragedCollection { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `add` [INFO] [stderr] --> src/ch17_oop/mod.rs:8:5 [INFO] [stderr] | [INFO] [stderr] 8 | pub fn add(&mut self, value: i32) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `remove` [INFO] [stderr] --> src/ch17_oop/mod.rs:13:5 [INFO] [stderr] | [INFO] [stderr] 13 | pub fn remove(&mut self) -> Option { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `average` [INFO] [stderr] --> src/ch17_oop/mod.rs:24:5 [INFO] [stderr] | [INFO] [stderr] 24 | pub fn average(&self) -> f64 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `update_average` [INFO] [stderr] --> src/ch17_oop/mod.rs:28:5 [INFO] [stderr] | [INFO] [stderr] 28 | fn update_average(&mut self) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Screen` [INFO] [stderr] --> src/ch17_oop/mod.rs:39:1 [INFO] [stderr] | [INFO] [stderr] 39 | pub struct Screen { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `run` [INFO] [stderr] --> src/ch17_oop/mod.rs:44:5 [INFO] [stderr] | [INFO] [stderr] 44 | pub fn run(&self) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Button` [INFO] [stderr] --> src/ch17_oop/mod.rs:52:1 [INFO] [stderr] | [INFO] [stderr] 52 | pub struct Button { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `SelectBox` [INFO] [stderr] --> src/ch17_oop/mod.rs:65:1 [INFO] [stderr] | [INFO] [stderr] 65 | struct SelectBox { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never used: `state` [INFO] [stderr] --> src/ch17_oop/mod.rs:140:5 [INFO] [stderr] | [INFO] [stderr] 140 | state: Option>, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `new` [INFO] [stderr] --> src/ch17_oop/mod.rs:145:5 [INFO] [stderr] | [INFO] [stderr] 145 | pub fn new() -> Post { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `add_text` [INFO] [stderr] --> src/ch17_oop/mod.rs:152:5 [INFO] [stderr] | [INFO] [stderr] 152 | pub fn add_text(&mut self, text: &str) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `content` [INFO] [stderr] --> src/ch17_oop/mod.rs:156:5 [INFO] [stderr] | [INFO] [stderr] 156 | pub fn content(&self) -> &str { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `request_review` [INFO] [stderr] --> src/ch17_oop/mod.rs:160:5 [INFO] [stderr] | [INFO] [stderr] 160 | pub fn request_review(&mut self) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `approve` [INFO] [stderr] --> src/ch17_oop/mod.rs:166:5 [INFO] [stderr] | [INFO] [stderr] 166 | pub fn approve(&mut self) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `reject` [INFO] [stderr] --> src/ch17_oop/mod.rs:172:5 [INFO] [stderr] | [INFO] [stderr] 172 | pub fn reject(&mut self) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `Either` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:22:1 [INFO] [stderr] | [INFO] [stderr] 22 | enum Either { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Post` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:27:1 [INFO] [stderr] | [INFO] [stderr] 27 | struct Post { [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `DraftPost` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:31:1 [INFO] [stderr] | [INFO] [stderr] 31 | struct DraftPost { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `new` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:36:5 [INFO] [stderr] | [INFO] [stderr] 36 | fn new() -> DraftPost { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `content` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:42:5 [INFO] [stderr] | [INFO] [stderr] 42 | fn content(&self) -> &str { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `add_text` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:48:5 [INFO] [stderr] | [INFO] [stderr] 48 | fn add_text(&mut self, text: &str) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `request_review` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:52:5 [INFO] [stderr] | [INFO] [stderr] 52 | fn request_review(self) -> PendingReviewPost { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `PendingReviewPost` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:60:1 [INFO] [stderr] | [INFO] [stderr] 60 | struct PendingReviewPost { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `approve` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:66:5 [INFO] [stderr] | [INFO] [stderr] 66 | fn approve(self) -> Either { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `reject` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:81:5 [INFO] [stderr] | [INFO] [stderr] 81 | fn reject(self) -> DraftPost { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `Message` [INFO] [stderr] --> src/ch18_pattern_match.rs:236:1 [INFO] [stderr] | [INFO] [stderr] 236 | enum Message { [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Point` [INFO] [stderr] --> src/ch18_pattern_match.rs:240:1 [INFO] [stderr] | [INFO] [stderr] 240 | struct Point { [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `foo` [INFO] [stderr] --> src/ch18_pattern_match.rs:245:1 [INFO] [stderr] | [INFO] [stderr] 245 | fn foo(x: i32) { [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `print_coordinates` [INFO] [stderr] --> src/ch18_pattern_match.rs:250:1 [INFO] [stderr] | [INFO] [stderr] 250 | fn print_coordinates(&(x, y): &(i32, i32)) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `dangerous` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_1_unsafe.rs:28:1 [INFO] [stderr] | [INFO] [stderr] 28 | unsafe fn dangerous() {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `split_at_mut` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_1_unsafe.rs:44:1 [INFO] [stderr] | [INFO] [stderr] 44 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: static item is never used: `HELLO_WORLD` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_1_unsafe.rs:77:1 [INFO] [stderr] | [INFO] [stderr] 77 | static HELLO_WORLD: &str = "Hello, world!"; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: static item is never used: `COUNTER` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_1_unsafe.rs:78:1 [INFO] [stderr] | [INFO] [stderr] 78 | static mut COUNTER: u32 = 0; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Context` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:2:1 [INFO] [stderr] | [INFO] [stderr] 2 | struct Context<'s>(&'s str); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Parser` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:4:1 [INFO] [stderr] | [INFO] [stderr] 4 | struct Parser<'c, 's: 'c> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `parse` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:9:5 [INFO] [stderr] | [INFO] [stderr] 9 | fn parse(&self) -> Result<(), &'s str> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `parse_context` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:14:1 [INFO] [stderr] | [INFO] [stderr] 14 | fn parse_context(context: Context) -> Result<(), &str> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Ref` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:19:1 [INFO] [stderr] | [INFO] [stderr] 19 | struct Ref<'a, T: 'a>(&'a T); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Bar` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:24:1 [INFO] [stderr] | [INFO] [stderr] 24 | struct Bar<'a> { [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `gDistance` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:19:1 [INFO] [stderr] | [INFO] [stderr] 19 | fn gDistance>(graph: &G, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `aDistance` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:28:1 [INFO] [stderr] | [INFO] [stderr] 28 | fn aDistance(graph: &G, start: &G::Node, end: &G::Node) -> u32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `distance` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:33:1 [INFO] [stderr] | [INFO] [stderr] 33 | fn distance(graph: &GGraph, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `traverse` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:35:1 [INFO] [stderr] | [INFO] [stderr] 35 | fn traverse(graph: &AGraph) {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Baz` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:102:1 [INFO] [stderr] | [INFO] [stderr] 102 | struct Baz; [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `f` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:117:5 [INFO] [stderr] | [INFO] [stderr] 117 | fn f(&self) { [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Wrapper` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:139:1 [INFO] [stderr] | [INFO] [stderr] 139 | struct Wrapper(Vec); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: type alias is never used: `Kilometers` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:1:1 [INFO] [stderr] | [INFO] [stderr] 1 | type Kilometers = i32; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: type alias is never used: `Thunk` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:2:1 [INFO] [stderr] | [INFO] [stderr] 2 | type Thunk = Box; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `bar` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:9:1 [INFO] [stderr] | [INFO] [stderr] 9 | fn bar() -> ! { [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `generic` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:18:1 [INFO] [stderr] | [INFO] [stderr] 18 | fn generic(t: T){} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `generic2` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:19:1 [INFO] [stderr] | [INFO] [stderr] 19 | fn generic2(t: T) {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `generic3` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:20:1 [INFO] [stderr] | [INFO] [stderr] 20 | fn generic3(t: &T) {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `add_one` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_5_advanced_func_closures.rs:1:1 [INFO] [stderr] | [INFO] [stderr] 1 | fn add_one(x: i32) -> i32 { x + 1 } [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `do_twice` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_5_advanced_func_closures.rs:3:1 [INFO] [stderr] | [INFO] [stderr] 3 | fn do_twice(f: fn(i32) -> i32, arg: i32) -> i32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `returns_closure` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_5_advanced_func_closures.rs:25:1 [INFO] [stderr] | [INFO] [stderr] 25 | fn returns_closure() -> Box i32> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function `gDistance` should have a snake case name [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:19:4 [INFO] [stderr] | [INFO] [stderr] 19 | fn gDistance>(graph: &G, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^^^^^ help: convert the identifier to snake case: `g_distance` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(non_snake_case)] on by default [INFO] [stderr] [INFO] [stderr] warning: function `aDistance` should have a snake case name [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:28:4 [INFO] [stderr] | [INFO] [stderr] 28 | fn aDistance(graph: &G, start: &G::Node, end: &G::Node) -> u32 { [INFO] [stderr] | ^^^^^^^^^ help: convert the identifier to snake case: `a_distance` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s2` [INFO] [stderr] --> src/ch4_ownership.rs:20:13 [INFO] [stderr] | [INFO] [stderr] 20 | let s2 = s1; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_s2` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_variables)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s1` [INFO] [stderr] --> src/ch4_ownership.rs:46:13 [INFO] [stderr] | [INFO] [stderr] 46 | let s1 = gives_ownership(); // gives_ownership moves its return [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_s1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s3` [INFO] [stderr] --> src/ch4_ownership.rs:51:13 [INFO] [stderr] | [INFO] [stderr] 51 | let s3 = takes_and_gives_back(s2); // s2 is moved into [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_s3` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/ch4_ownership.rs:78:17 [INFO] [stderr] | [INFO] [stderr] 78 | let r1 = &mut s; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/ch4_ownership.rs:82:17 [INFO] [stderr] | [INFO] [stderr] 82 | let r2 = &mut s; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/ch4_ownership.rs:86:17 [INFO] [stderr] | [INFO] [stderr] 86 | let r1 = &s; // no problem [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/ch4_ownership.rs:87:17 [INFO] [stderr] | [INFO] [stderr] 87 | let r2 = &s; // no problem [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `user2` [INFO] [stderr] --> src/ch5_structs.rs:24:9 [INFO] [stderr] | [INFO] [stderr] 24 | let user2 = User { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_user2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `black` [INFO] [stderr] --> src/ch5_structs.rs:30:9 [INFO] [stderr] | [INFO] [stderr] 30 | let black = Color(0, 0, 0); [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_black` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `origin` [INFO] [stderr] --> src/ch5_structs.rs:31:9 [INFO] [stderr] | [INFO] [stderr] 31 | let origin = Point(0, 0, 0); [INFO] [stderr] | ^^^^^^ help: consider prefixing with an underscore: `_origin` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `ip_type` [INFO] [stderr] --> src/ch6_enums.rs:53:10 [INFO] [stderr] | [INFO] [stderr] 53 | fn route(ip_type: IpAddrKind) {} [INFO] [stderr] | ^^^^^^^ help: consider prefixing with an underscore: `_ip_type` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `v` [INFO] [stderr] --> src/ch8_collections.rs:11:13 [INFO] [stderr] | [INFO] [stderr] 11 | let v: Vec = Vec::new(); [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_v` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `v` [INFO] [stderr] --> src/ch8_collections.rs:12:13 [INFO] [stderr] | [INFO] [stderr] 12 | let v = vec![1, 2, 3]; [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_v` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `third` [INFO] [stderr] --> src/ch8_collections.rs:25:13 [INFO] [stderr] | [INFO] [stderr] 25 | let third: &i32 = &v[2]; [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_third` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `third` [INFO] [stderr] --> src/ch8_collections.rs:26:13 [INFO] [stderr] | [INFO] [stderr] 26 | let third: Option<&i32> = v.get(2); [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_third` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `first` [INFO] [stderr] --> src/ch8_collections.rs:33:13 [INFO] [stderr] | [INFO] [stderr] 33 | let first = &v[0]; [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_first` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `row` [INFO] [stderr] --> src/ch8_collections.rs:41:13 [INFO] [stderr] | [INFO] [stderr] 41 | let row = vec![ [INFO] [stderr] | ^^^ help: consider prefixing with an underscore: `_row` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/ch8_collections.rs:52:9 [INFO] [stderr] | [INFO] [stderr] 52 | let s = String::from("initial contents"); [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/ch8_collections.rs:53:9 [INFO] [stderr] | [INFO] [stderr] 53 | let s = "initial contents".to_string(); [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s3` [INFO] [stderr] --> src/ch8_collections.rs:67:9 [INFO] [stderr] | [INFO] [stderr] 67 | let s3 = s1 + &s2; // Note that s1 has been moved here and can no longer be used [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_s3` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/ch8_collections.rs:73:9 [INFO] [stderr] | [INFO] [stderr] 73 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/ch8_collections.rs:76:9 [INFO] [stderr] | [INFO] [stderr] 76 | let s = &hello[0..4]; [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `score` [INFO] [stderr] --> src/ch8_collections.rs:100:17 [INFO] [stderr] | [INFO] [stderr] 100 | let score = scores.get(&team_name); [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_score` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `scores` [INFO] [stderr] --> src/ch8_collections.rs:115:13 [INFO] [stderr] | [INFO] [stderr] 115 | let scores: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect(); [INFO] [stderr] | ^^^^^^ help: consider prefixing with an underscore: `_scores` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:113:58 [INFO] [stderr] | [INFO] [stderr] 113 | fn some_function(t: T, u: U) -> i32 { [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `u` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:113:64 [INFO] [stderr] | [INFO] [stderr] 113 | fn some_function(t: T, u: U) -> i32 { [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_u` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:117:25 [INFO] [stderr] | [INFO] [stderr] 117 | fn some_function2(t: T, u: U) -> i32 [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `u` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:117:31 [INFO] [stderr] | [INFO] [stderr] 117 | fn some_function2(t: T, u: U) -> i32 [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_u` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:67:13 [INFO] [stderr] | [INFO] [stderr] 67 | let i = ImportantExcerpt { part: first_sentence }; [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `v1` [INFO] [stderr] --> src/ch13_fp.rs:168:9 [INFO] [stderr] | [INFO] [stderr] 168 | let v1 = c.value(1); [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_v1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c1` [INFO] [stderr] --> src/ch14_cargo_crates.rs:37:16 [INFO] [stderr] | [INFO] [stderr] 37 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_c1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c2` [INFO] [stderr] --> src/ch14_cargo_crates.rs:37:34 [INFO] [stderr] | [INFO] [stderr] 37 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_c2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `list` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_1_box.rs:18:9 [INFO] [stderr] | [INFO] [stderr] 18 | let list = Cons(1, [INFO] [stderr] | ^^^^ help: consider prefixing with an underscore: `_list` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `audio` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_1_box.rs:66:21 [INFO] [stderr] | [INFO] [stderr] 66 | fn compress_mp3(audio: &[u8]) -> Vec { vec![1, 3] } [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_audio` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_1_box.rs:84:9 [INFO] [stderr] | [INFO] [stderr] 84 | let c = CustomSmartPointer { data: String::from("some data") }; [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_c` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `b` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_4_rc.rs:20:9 [INFO] [stderr] | [INFO] [stderr] 20 | let b = Cons(3, a.clone()); [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_b` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_4_rc.rs:24:13 [INFO] [stderr] | [INFO] [stderr] 24 | let c = Cons(4, a.clone()); [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_c` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_5_ref_cell.rs:30:13 [INFO] [stderr] | [INFO] [stderr] 30 | let r1 = s.borrow_mut(); [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `post` [INFO] [stderr] --> src/ch17_oop/mod.rs:184:27 [INFO] [stderr] | [INFO] [stderr] 184 | fn content<'a>(&self, post: &'a Post) -> &'a str { [INFO] [stderr] | ^^^^ help: consider prefixing with an underscore: `_post` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `content` [INFO] [stderr] --> src/ch17_oop/mod.rs:188:24 [INFO] [stderr] | [INFO] [stderr] 188 | fn add_text(&self, content: &mut String, text: &str) {} [INFO] [stderr] | ^^^^^^^ help: consider prefixing with an underscore: `_content` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `text` [INFO] [stderr] --> src/ch17_oop/mod.rs:188:46 [INFO] [stderr] | [INFO] [stderr] 188 | fn add_text(&self, content: &mut String, text: &str) {} [INFO] [stderr] | ^^^^ help: consider prefixing with an underscore: `_text` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/ch18_pattern_match.rs:245:8 [INFO] [stderr] | [INFO] [stderr] 245 | fn foo(x: i32) { [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/ch18_pattern_match.rs:52:13 [INFO] [stderr] | [INFO] [stderr] 52 | let x = 5;//let PATTERN = EXPRESSION; [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/ch18_pattern_match.rs:53:14 [INFO] [stderr] | [INFO] [stderr] 53 | let (x, y, z) = (1, 2, 3); [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/ch18_pattern_match.rs:53:17 [INFO] [stderr] | [INFO] [stderr] 53 | let (x, y, z) = (1, 2, 3); [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `z` [INFO] [stderr] --> src/ch18_pattern_match.rs:53:20 [INFO] [stderr] | [INFO] [stderr] 53 | let (x, y, z) = (1, 2, 3); [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_z` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `sum_of_squares` [INFO] [stderr] --> src/ch18_pattern_match.rs:141:17 [INFO] [stderr] | [INFO] [stderr] 141 | let sum_of_squares: i32 = points [INFO] [stderr] | ^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_sum_of_squares` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `feet` [INFO] [stderr] --> src/ch18_pattern_match.rs:146:19 [INFO] [stderr] | [INFO] [stderr] 146 | let ((feet, inches), Point {x, y}) = ((3, 10), Point { x: 3, y: -10 }); [INFO] [stderr] | ^^^^ help: consider prefixing with an underscore: `_feet` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `inches` [INFO] [stderr] --> src/ch18_pattern_match.rs:146:25 [INFO] [stderr] | [INFO] [stderr] 146 | let ((feet, inches), Point {x, y}) = ((3, 10), Point { x: 3, y: -10 }); [INFO] [stderr] | ^^^^^^ help: consider prefixing with an underscore: `_inches` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/ch18_pattern_match.rs:146:41 [INFO] [stderr] | [INFO] [stderr] 146 | let ((feet, inches), Point {x, y}) = ((3, 10), Point { x: 3, y: -10 }); [INFO] [stderr] | ^ help: try ignoring the field: `x: _` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/ch18_pattern_match.rs:146:44 [INFO] [stderr] | [INFO] [stderr] 146 | let ((feet, inches), Point {x, y}) = ((3, 10), Point { x: 3, y: -10 }); [INFO] [stderr] | ^ help: try ignoring the field: `y: _` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/ch18_pattern_match.rs:160:17 [INFO] [stderr] | [INFO] [stderr] 160 | let y = 10; [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_1_unsafe.rs:13:9 [INFO] [stderr] | [INFO] [stderr] 13 | let r = address as *const i32; [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_r` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `obj` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:37:9 [INFO] [stderr] | [INFO] [stderr] 37 | let obj = Box::new(Bar { x: &num }) as Box; [INFO] [stderr] | ^^^ help: consider prefixing with an underscore: `_obj` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `graph` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:19:37 [INFO] [stderr] | [INFO] [stderr] 19 | fn gDistance>(graph: &G, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_graph` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `start` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:19:48 [INFO] [stderr] | [INFO] [stderr] 19 | fn gDistance>(graph: &G, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_start` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `end` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:19:59 [INFO] [stderr] | [INFO] [stderr] 19 | fn gDistance>(graph: &G, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^ help: consider prefixing with an underscore: `_end` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `graph` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:28:25 [INFO] [stderr] | [INFO] [stderr] 28 | fn aDistance(graph: &G, start: &G::Node, end: &G::Node) -> u32 { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_graph` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `start` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:28:36 [INFO] [stderr] | [INFO] [stderr] 28 | fn aDistance(graph: &G, start: &G::Node, end: &G::Node) -> u32 { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_start` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `end` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:28:53 [INFO] [stderr] | [INFO] [stderr] 28 | fn aDistance(graph: &G, start: &G::Node, end: &G::Node) -> u32 { [INFO] [stderr] | ^^^ help: consider prefixing with an underscore: `_end` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `graph` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:33:19 [INFO] [stderr] | [INFO] [stderr] 33 | fn distance(graph: &GGraph, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_graph` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `start` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:33:41 [INFO] [stderr] | [INFO] [stderr] 33 | fn distance(graph: &GGraph, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_start` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `end` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:33:52 [INFO] [stderr] | [INFO] [stderr] 33 | fn distance(graph: &GGraph, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^ help: consider prefixing with an underscore: `_end` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `graph` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:35:13 [INFO] [stderr] | [INFO] [stderr] 35 | fn traverse(graph: &AGraph) {} [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_graph` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:18:15 [INFO] [stderr] | [INFO] [stderr] 18 | fn generic(t: T){} [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:19:23 [INFO] [stderr] | [INFO] [stderr] 19 | fn generic2(t: T) {} [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:20:24 [INFO] [stderr] | [INFO] [stderr] 20 | fn generic3(t: &T) {} [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `list_of_strings` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_5_advanced_func_closures.rs:13:9 [INFO] [stderr] | [INFO] [stderr] 13 | let list_of_strings: Vec = list_of_numbers [INFO] [stderr] | ^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_list_of_strings` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `list_of_strings` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_5_advanced_func_closures.rs:18:9 [INFO] [stderr] | [INFO] [stderr] 18 | let list_of_strings: Vec = list_of_numbers [INFO] [stderr] | ^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_list_of_strings` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/ch8_collections.rs:31:13 [INFO] [stderr] | [INFO] [stderr] 31 | let mut v = vec![1, 2, 3, 4, 5]; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_mut)] on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `makes_copy` [INFO] [stderr] --> src/ch4_ownership.rs:111:1 [INFO] [stderr] | [INFO] [stderr] 111 | fn makes_copy(some_integer: i32) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(dead_code)] on by default [INFO] [stderr] [INFO] [stderr] warning: field is never used: `username` [INFO] [stderr] --> src/ch5_structs.rs:2:5 [INFO] [stderr] | [INFO] [stderr] 2 | username: String, [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never used: `sign_in_count` [INFO] [stderr] --> src/ch5_structs.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | sign_in_count: u64, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never used: `active` [INFO] [stderr] --> src/ch5_structs.rs:5:5 [INFO] [stderr] | [INFO] [stderr] 5 | active: bool, [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `build_user` [INFO] [stderr] --> src/ch5_structs.rs:34:1 [INFO] [stderr] | [INFO] [stderr] 34 | fn build_user(email: String, username: String) -> User { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `UsState` [INFO] [stderr] --> src/ch6_enums.rs:7:1 [INFO] [stderr] | [INFO] [stderr] 7 | enum UsState { [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `Coin` [INFO] [stderr] --> src/ch6_enums.rs:13:1 [INFO] [stderr] | [INFO] [stderr] 13 | enum Coin { [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `value_in_cents` [INFO] [stderr] --> src/ch6_enums.rs:20:1 [INFO] [stderr] | [INFO] [stderr] 20 | fn value_in_cents(coin: Coin) -> u32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `nested_modules` [INFO] [stderr] --> src/ch7_modules.rs:21:13 [INFO] [stderr] | [INFO] [stderr] 21 | pub fn nested_modules() {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `read_username_from_file` [INFO] [stderr] --> src/ch9_error.rs:44:1 [INFO] [stderr] | [INFO] [stderr] 44 | fn read_username_from_file() -> Result { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `read_username_from_file2` [INFO] [stderr] --> src/ch9_error.rs:60:1 [INFO] [stderr] | [INFO] [stderr] 60 | fn read_username_from_file2() -> Result { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `read_username_from_file3` [INFO] [stderr] --> src/ch9_error.rs:67:1 [INFO] [stderr] | [INFO] [stderr] 67 | fn read_username_from_file3() -> Result { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `longest_with_an_announcement` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:83:1 [INFO] [stderr] | [INFO] [stderr] 83 | / fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str [INFO] [stderr] 84 | | where T: Display [INFO] [stderr] 85 | | { [INFO] [stderr] 86 | | println!("Announcement! {}", ann); [INFO] [stderr] ... | [INFO] [stderr] 91 | | } [INFO] [stderr] 92 | | } [INFO] [stderr] | |_^ [INFO] [stderr] [INFO] [stderr] warning: field is never used: `part` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:95:5 [INFO] [stderr] | [INFO] [stderr] 95 | part: &'a str, [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `level` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:99:5 [INFO] [stderr] | [INFO] [stderr] 99 | fn level(&self) -> i32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `announce_and_return_part` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:103:5 [INFO] [stderr] | [INFO] [stderr] 103 | fn announce_and_return_part(&self, announcement: &str) -> &str { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `notify` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:109:1 [INFO] [stderr] | [INFO] [stderr] 109 | fn notify(item: T) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `some_function` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:113:1 [INFO] [stderr] | [INFO] [stderr] 113 | fn some_function(t: T, u: U) -> i32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `some_function2` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:117:1 [INFO] [stderr] | [INFO] [stderr] 117 | / fn some_function2(t: T, u: U) -> i32 [INFO] [stderr] 118 | | where T: Display + Clone, [INFO] [stderr] 119 | | U: Clone + Display { [INFO] [stderr] 120 | | 1 [INFO] [stderr] 121 | | } [INFO] [stderr] | |_^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Point` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:147:1 [INFO] [stderr] | [INFO] [stderr] 147 | struct Point { [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `x` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:153:5 [INFO] [stderr] | [INFO] [stderr] 153 | fn x(&self) -> &T { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Point2` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:158:1 [INFO] [stderr] | [INFO] [stderr] 158 | struct Point2 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `mixup` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:164:5 [INFO] [stderr] | [INFO] [stderr] 164 | fn mixup(self, other: Point2) -> Point2 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `Option` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:172:1 [INFO] [stderr] | [INFO] [stderr] 172 | enum Option { [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `NewsArticle` [INFO] [stderr] --> src/ch10_generic_trait_lifetime.rs:185:1 [INFO] [stderr] | [INFO] [stderr] 185 | struct NewsArticle { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never used: `value` [INFO] [stderr] --> src/ch11_test.rs:25:5 [INFO] [stderr] | [INFO] [stderr] 25 | value: u32, [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never used: `artist` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_1_box.rs:26:5 [INFO] [stderr] | [INFO] [stderr] 26 | artist: Option, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never used: `title` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_1_box.rs:27:5 [INFO] [stderr] | [INFO] [stderr] 27 | title: Option, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never used: `data` [INFO] [stderr] --> src/ch15_smart_pointers/ch15_1_box.rs:73:5 [INFO] [stderr] | [INFO] [stderr] 73 | data: String, [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `AveragedCollection` [INFO] [stderr] --> src/ch17_oop/mod.rs:2:1 [INFO] [stderr] | [INFO] [stderr] 2 | pub struct AveragedCollection { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `add` [INFO] [stderr] --> src/ch17_oop/mod.rs:8:5 [INFO] [stderr] | [INFO] [stderr] 8 | pub fn add(&mut self, value: i32) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `remove` [INFO] [stderr] --> src/ch17_oop/mod.rs:13:5 [INFO] [stderr] | [INFO] [stderr] 13 | pub fn remove(&mut self) -> Option { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `average` [INFO] [stderr] --> src/ch17_oop/mod.rs:24:5 [INFO] [stderr] | [INFO] [stderr] 24 | pub fn average(&self) -> f64 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `update_average` [INFO] [stderr] --> src/ch17_oop/mod.rs:28:5 [INFO] [stderr] | [INFO] [stderr] 28 | fn update_average(&mut self) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `reject` [INFO] [stderr] --> src/ch17_oop/encoding_states_as_type.rs:81:5 [INFO] [stderr] | [INFO] [stderr] 81 | fn reject(self) -> DraftPost { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `foo` [INFO] [stderr] --> src/ch18_pattern_match.rs:245:1 [INFO] [stderr] | [INFO] [stderr] 245 | fn foo(x: i32) { [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Context` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:2:1 [INFO] [stderr] | [INFO] [stderr] 2 | struct Context<'s>(&'s str); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Parser` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:4:1 [INFO] [stderr] | [INFO] [stderr] 4 | struct Parser<'c, 's: 'c> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `parse` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:9:5 [INFO] [stderr] | [INFO] [stderr] 9 | fn parse(&self) -> Result<(), &'s str> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `parse_context` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:14:1 [INFO] [stderr] | [INFO] [stderr] 14 | fn parse_context(context: Context) -> Result<(), &str> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Ref` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:19:1 [INFO] [stderr] | [INFO] [stderr] 19 | struct Ref<'a, T: 'a>(&'a T); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never used: `x` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_2_advanced_lifetime.rs:25:5 [INFO] [stderr] | [INFO] [stderr] 25 | x: &'a i32, [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `gDistance` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:19:1 [INFO] [stderr] | [INFO] [stderr] 19 | fn gDistance>(graph: &G, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `aDistance` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:28:1 [INFO] [stderr] | [INFO] [stderr] 28 | fn aDistance(graph: &G, start: &G::Node, end: &G::Node) -> u32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `distance` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:33:1 [INFO] [stderr] | [INFO] [stderr] 33 | fn distance(graph: &GGraph, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `traverse` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:35:1 [INFO] [stderr] | [INFO] [stderr] 35 | fn traverse(graph: &AGraph) {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Wrapper` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:139:1 [INFO] [stderr] | [INFO] [stderr] 139 | struct Wrapper(Vec); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: type alias is never used: `Kilometers` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:1:1 [INFO] [stderr] | [INFO] [stderr] 1 | type Kilometers = i32; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: type alias is never used: `Thunk` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:2:1 [INFO] [stderr] | [INFO] [stderr] 2 | type Thunk = Box; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `bar` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:9:1 [INFO] [stderr] | [INFO] [stderr] 9 | fn bar() -> ! { [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `generic` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:18:1 [INFO] [stderr] | [INFO] [stderr] 18 | fn generic(t: T){} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `generic2` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:19:1 [INFO] [stderr] | [INFO] [stderr] 19 | fn generic2(t: T) {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `generic3` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_4_advanced_types.rs:20:1 [INFO] [stderr] | [INFO] [stderr] 20 | fn generic3(t: &T) {} [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `returns_closure` [INFO] [stderr] --> src/ch19_advanced_feature/ch19_5_advanced_func_closures.rs:25:1 [INFO] [stderr] | [INFO] [stderr] 25 | fn returns_closure() -> Box i32> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/ch16_concurrency/ch16_1_threads.rs:15:5 [INFO] [stderr] | [INFO] [stderr] 15 | handle.join(); [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_must_use)] on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/ch16_concurrency/ch16_1_threads.rs:25:5 [INFO] [stderr] | [INFO] [stderr] 25 | handle.join(); [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: function `gDistance` should have a snake case name [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:19:4 [INFO] [stderr] | [INFO] [stderr] 19 | fn gDistance>(graph: &G, start: &N, end: &N) -> u32 { 1 } [INFO] [stderr] | ^^^^^^^^^ help: convert the identifier to snake case: `g_distance` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(non_snake_case)] on by default [INFO] [stderr] [INFO] [stderr] warning: function `aDistance` should have a snake case name [INFO] [stderr] --> src/ch19_advanced_feature/ch19_3_advanced_traits.rs:28:4 [INFO] [stderr] | [INFO] [stderr] 28 | fn aDistance(graph: &G, start: &G::Node, end: &G::Node) -> u32 { [INFO] [stderr] | ^^^^^^^^^ help: convert the identifier to snake case: `a_distance` [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1.37s [INFO] running `"docker" "inspect" "d922b7e46aecff1a85e7b629f77cd46e005cd58e99bbd22efb9943a0b0ae1898"` [INFO] running `"docker" "rm" "-f" "d922b7e46aecff1a85e7b629f77cd46e005cd58e99bbd22efb9943a0b0ae1898"` [INFO] [stdout] d922b7e46aecff1a85e7b629f77cd46e005cd58e99bbd22efb9943a0b0ae1898