[INFO] cloning repository https://github.com/HillBamboo/learn_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/HillBamboo/learn_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHillBamboo%2Flearn_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHillBamboo%2Flearn_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f772f033dcf258227431aecd75d2c04f01f5746c
[INFO] checking HillBamboo/learn_rust against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHillBamboo%2Flearn_rust" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/HillBamboo/learn_rust on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/HillBamboo/learn_rust
[INFO] finished tweaking git repo https://github.com/HillBamboo/learn_rust
[INFO] tweaked toml for git repo https://github.com/HillBamboo/learn_rust written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/HillBamboo/learn_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3f3808800fa19ec04dddd28db5dbb15918faa30743022a8f5dfa6b1ea4b263f7
[INFO] running `Command { std: "docker" "start" "-a" "3f3808800fa19ec04dddd28db5dbb15918faa30743022a8f5dfa6b1ea4b263f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3f3808800fa19ec04dddd28db5dbb15918faa30743022a8f5dfa6b1ea4b263f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f3808800fa19ec04dddd28db5dbb15918faa30743022a8f5dfa6b1ea4b263f7", kill_on_drop: false }`
[INFO] [stdout] 3f3808800fa19ec04dddd28db5dbb15918faa30743022a8f5dfa6b1ea4b263f7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 89bd373419b30d7954fccc2e607d3499066965fbbbe251ccd959c99e55ac6574
[INFO] running `Command { std: "docker" "start" "-a" "89bd373419b30d7954fccc2e607d3499066965fbbbe251ccd959c99e55ac6574", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking learn_rust v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/rust_book/ch5_struct_enum_pattern_match/_enum.rs (6 fixes)
[INFO] [stderr]        Fixed src/rust_book/ch4_ownership.rs (2 fixes)
[INFO] [stderr]        Fixed src/main.rs (3 fixes)
[INFO] [stderr]        Fixed src/rust_book/ch5_struct_enum_pattern_match/_struct.rs (1 fix)
[INFO] [stderr]        Fixed src/rust_book/ch8_collections.rs (5 fixes)
[INFO] [stderr]        Fixed src/rust_book/ch10_generic_traits_lefetime.rs (3 fixes)
[INFO] [stderr]        Fixed src/rust_book/ch9_error_handling.rs (3 fixes)
[INFO] [stderr]        Fixed src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs (2 fixes)
[INFO] [stderr]        Fixed src/rust_book/ch3_common_concepts.rs (4 fixes)
[INFO] [stderr]        Fixed src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs (4 fixes)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:28:57
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn take_ownership(s : String) { println!("{}", s); };
[INFO] [stdout]    |                                                         ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:36:6
[INFO] [stdout]    |
[INFO] [stdout] 36 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:28:57
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn take_ownership(s : String) { println!("{}", s); };
[INFO] [stdout]    |                                                         ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:36:6
[INFO] [stdout]    |
[INFO] [stdout] 36 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_or_borrow`
[INFO] [stdout]  --> src/rust_book/ch4_ownership.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn move_or_borrow() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `owership`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn owership() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `borrow`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn borrow() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_sematics_for_user_defined_type`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn move_sematics_for_user_defined_type() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `show`
[INFO] [stdout]    --> src/rust_book/ch4_ownership.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |         fn show(&self) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |             kind : IpAddrKind,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |             address : String,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |         width : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         height : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |         fn area(&self) -> u32 {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |         fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Apple`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         Apple,
[INFO] [stdout]   |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Banane`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         Banane,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Watermelon`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         Watermelon,
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `A`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         A,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         B,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `C`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         C,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `headline`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     headline: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `location`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     location: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `author`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     author: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `reply`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     reply: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `retweet`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     retweet: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |             part: &'a str,
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 38 |         fn longest<'a, 'b>(s1 : &'a str, _s2 : &'b str) -> &'a str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |         x : T,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         y : U,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `_A` should have a snake case name
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:37:14
[INFO] [stdout]    |
[INFO] [stdout] 37 |         Some(_A) => println!("a"),
[INFO] [stdout]    |              ^^ help: convert the identifier to snake case: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement with no effect
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:26:20
[INFO] [stdout]    |
[INFO] [stdout] 26 |     for i in &v1 { i; }
[INFO] [stdout]    |                    ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 34 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_or_borrow`
[INFO] [stdout]  --> src/rust_book/ch4_ownership.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn move_or_borrow() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `owership`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn owership() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `borrow`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn borrow() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_sematics_for_user_defined_type`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn move_sematics_for_user_defined_type() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `show`
[INFO] [stdout]    --> src/rust_book/ch4_ownership.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |         fn show(&self) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |             kind : IpAddrKind,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |             address : String,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |         width : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         height : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |         fn area(&self) -> u32 {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |         fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Apple`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         Apple,
[INFO] [stdout]   |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Banane`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         Banane,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Watermelon`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         Watermelon,
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `A`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         A,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         B,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `C`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         C,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `headline`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     headline: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `location`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     location: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `author`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     author: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `reply`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     reply: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `retweet`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     retweet: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |             part: &'a str,
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 38 |         fn longest<'a, 'b>(s1 : &'a str, _s2 : &'b str) -> &'a str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |         x : T,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         y : U,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `_A` should have a snake case name
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:37:14
[INFO] [stdout]    |
[INFO] [stdout] 37 |         Some(_A) => println!("a"),
[INFO] [stdout]    |              ^^ help: convert the identifier to snake case: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement with no effect
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:26:20
[INFO] [stdout]    |
[INFO] [stdout] 26 |     for i in &v1 { i; }
[INFO] [stdout]    |                    ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.03s
[INFO] [stdout] warning: 34 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Checking learn_rust v0.1.0 (/tmp/fixit)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:28:57
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn take_ownership(s : String) { println!("{}", s); };
[INFO] [stdout]    |                                                         ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:36:6
[INFO] [stdout]    |
[INFO] [stdout] 36 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:28:57
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn take_ownership(s : String) { println!("{}", s); };
[INFO] [stdout]    |                                                         ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:36:6
[INFO] [stdout]    |
[INFO] [stdout] 36 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_or_borrow`
[INFO] [stdout]  --> src/rust_book/ch4_ownership.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn move_or_borrow() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `owership`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn owership() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `borrow`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn borrow() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_sematics_for_user_defined_type`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn move_sematics_for_user_defined_type() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `show`
[INFO] [stdout]    --> src/rust_book/ch4_ownership.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |         fn show(&self) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |             kind : IpAddrKind,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |             address : String,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |         width : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         height : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |         fn area(&self) -> u32 {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |         fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Apple`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         Apple,
[INFO] [stdout]   |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Banane`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         Banane,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Watermelon`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         Watermelon,
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `A`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         A,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         B,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `C`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         C,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `headline`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     headline: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `location`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     location: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `author`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     author: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `reply`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     reply: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `retweet`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     retweet: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |             part: &'a str,
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 38 |         fn longest<'a, 'b>(s1 : &'a str, _s2 : &'b str) -> &'a str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |         x : T,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         y : U,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `_A` should have a snake case name
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:37:14
[INFO] [stdout]    |
[INFO] [stdout] 37 |         Some(_A) => println!("a"),
[INFO] [stdout]    |              ^^ help: convert the identifier to snake case: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement with no effect
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:26:20
[INFO] [stdout]    |
[INFO] [stdout] 26 |     for i in &v1 { i; }
[INFO] [stdout]    |                    ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 34 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_or_borrow`
[INFO] [stdout]  --> src/rust_book/ch4_ownership.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn move_or_borrow() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `owership`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn owership() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `borrow`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn borrow() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_sematics_for_user_defined_type`
[INFO] [stdout]   --> src/rust_book/ch4_ownership.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn move_sematics_for_user_defined_type() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `show`
[INFO] [stdout]    --> src/rust_book/ch4_ownership.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |         fn show(&self) {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |             kind : IpAddrKind,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_enum.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |             address : String,
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |         width : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         height : u32,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |         fn area(&self) -> u32 {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_struct.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |         fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Apple`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         Apple,
[INFO] [stdout]   |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Banane`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |         Banane,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Watermelon`
[INFO] [stdout]  --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         Watermelon,
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `A`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         A,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `B`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         B,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `C`
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         C,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_username_from_file`
[INFO] [stdout]   --> src/rust_book/ch9_error_handling.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `headline`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     headline: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `location`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     location: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `author`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     author: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     username: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `reply`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     reply: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `retweet`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/traits.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     retweet: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `part`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |             part: &'a str,
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime/lifetimes.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 38 |         fn longest<'a, 'b>(s1 : &'a str, _s2 : &'b str) -> &'a str {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |         x : T,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/rust_book/ch10_generic_traits_lefetime.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         y : U,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `_A` should have a snake case name
[INFO] [stdout]   --> src/rust_book/ch5_struct_enum_pattern_match/_pattern_match.rs:37:14
[INFO] [stdout]    |
[INFO] [stdout] 37 |         Some(_A) => println!("a"),
[INFO] [stdout]    |              ^^ help: convert the identifier to snake case: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement with no effect
[INFO] [stdout]   --> src/rust_book/ch8_collections.rs:26:20
[INFO] [stdout]    |
[INFO] [stdout] 26 |     for i in &v1 { i; }
[INFO] [stdout]    |                    ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 34 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.44s
[INFO] running `Command { std: "docker" "inspect" "89bd373419b30d7954fccc2e607d3499066965fbbbe251ccd959c99e55ac6574", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89bd373419b30d7954fccc2e607d3499066965fbbbe251ccd959c99e55ac6574", kill_on_drop: false }`
[INFO] [stdout] 89bd373419b30d7954fccc2e607d3499066965fbbbe251ccd959c99e55ac6574