[INFO] updating cached repository haihuxia/rust-hello
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/haihuxia/rust-hello
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/haihuxia/rust-hello" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/haihuxia/rust-hello"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/haihuxia/rust-hello'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/haihuxia/rust-hello" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/haihuxia/rust-hello"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/haihuxia/rust-hello'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 17587059d6031e5a8eddc0e4f13b57b4abaaa5e2
[INFO] sha for GitHub repo haihuxia/rust-hello: 17587059d6031e5a8eddc0e4f13b57b4abaaa5e2
[INFO] validating manifest of haihuxia/rust-hello on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of haihuxia/rust-hello on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing haihuxia/rust-hello
[INFO] finished frobbing haihuxia/rust-hello
[INFO] frobbed toml for haihuxia/rust-hello written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/haihuxia/rust-hello/Cargo.toml
[INFO] started frobbing haihuxia/rust-hello
[INFO] finished frobbing haihuxia/rust-hello
[INFO] frobbed toml for haihuxia/rust-hello written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/haihuxia/rust-hello/Cargo.toml
[INFO] crate haihuxia/rust-hello already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking haihuxia/rust-hello against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-2/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/haihuxia/rust-hello:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] d80e541cb7f018d7469a5f9c3214c4b4aaf3b37b92f316246790bb8d3a040e06
[INFO] running `"docker" "start" "-a" "d80e541cb7f018d7469a5f9c3214c4b4aaf3b37b92f316246790bb8d3a040e06"`
[INFO] [stderr]     Checking rust-hello v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::trim_left': superseded by `trim_start`
[INFO] [stderr]    --> src/lib.rs:112:31
[INFO] [stderr]     |
[INFO] [stderr] 112 |             results.push(line.trim_left());
[INFO] [stderr]     |                               ^^^^^^^^^ help: replace the use of the deprecated item: `trim_start`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::trim_left': superseded by `trim_start`
[INFO] [stderr]    --> src/lib.rs:125:31
[INFO] [stderr]     |
[INFO] [stderr] 125 |             results.push(line.trim_left());
[INFO] [stderr]     |                               ^^^^^^^^^ help: replace the use of the deprecated item: `trim_start`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]  --> src/slices.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let hello = &s[0..5];
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_hello`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]  --> src/slices.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let hello = &s[0..=4];
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]  --> src/slices.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let hello = &s[..5];
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/slices.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let world = &s[6..11];
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/slices.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let world = &s[6..=10];
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/slices.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let world = &s[6..len];
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/slices.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let world = &s[6..];
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello_world`
[INFO] [stderr]   --> src/slices.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let hello_world = &s[0..len];
[INFO] [stderr]    |         ^^^^^^^^^^^ help: consider prefixing with an underscore: `_hello_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello_world`
[INFO] [stderr]   --> src/slices.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let hello_world = &s[..];
[INFO] [stderr]    |         ^^^^^^^^^^^ help: consider prefixing with an underscore: `_hello_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user2`
[INFO] [stderr]   --> src/structs.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let user2 = User {
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_user2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user3`
[INFO] [stderr]   --> src/structs.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let user3 = User {
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_user3`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `black`
[INFO] [stderr]   --> src/structs.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     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/structs.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let origin = Point(0, 0, 0);
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_origin`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `four`
[INFO] [stderr]   --> src/enums.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let four = IpAddKind::V4;
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_four`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/enums.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let six = IpAddKind::V6;
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enums.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let home = IpAddr {
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loopback`
[INFO] [stderr]   --> src/enums.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let loopback = IpAddr {
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enums.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let home = IpAddr::V4(String::from("127.0.0.1"));
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loopback`
[INFO] [stderr]   --> src/enums.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |     let loopback = IpAddr::V6(String::from("::1"));
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enums.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |     let home = IpAddr::V4(127, 0, 0, 1);
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loopback`
[INFO] [stderr]   --> src/enums.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let loopback = IpAddr::V6(String::from("::1"));
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/matchs.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 |     let six = plus_one(five);
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]   --> src/matchs.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     let none = plus_one(None);
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `count` is assigned to, but never used
[INFO] [stderr]   --> src/iflet.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut count = 0;
[INFO] [stderr]    |             ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_count` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `count` is never read
[INFO] [stderr]   --> src/iflet.rs:19:14
[INFO] [stderr]    |
[INFO] [stderr] 19 |         _ => count += 1,
[INFO] [stderr]    |              ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `count` is assigned to, but never used
[INFO] [stderr]   --> src/iflet.rs:24:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let mut count = 0;
[INFO] [stderr]    |             ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_count` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `count` is never read
[INFO] [stderr]   --> src/iflet.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |         count += 1;
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/vectors.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let v: Vec<i32> = Vec::new();
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]  --> src/vectors.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let a = vec![1, 2, 3];
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/vectors.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let six = &b[1];
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/vectors.rs:40:9
[INFO] [stderr]    |
[INFO] [stderr] 40 |     let row = vec![
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/strings.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let s = data.to_string();
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/strings.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let s = "initial content".to_string();
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/strings.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let s = String::from("initial content");
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/strings.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     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/hashmaps.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let s: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `score`
[INFO] [stderr]   --> src/hashmaps.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let score = scores.get(&team_name);
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_score`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/errors.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let f = match f {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/errors.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let f = File::open("hello.txt").map_err(|error| {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/errors.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let f = File::open("hello.txt").unwrap();
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/errors.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `flot`
[INFO] [stderr]   --> src/gennic.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let flot = PointA { x: 1.0, y: 4.0 };
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_flot`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `both_integer`
[INFO] [stderr]   --> src/gennic.rs:40:9
[INFO] [stderr]    |
[INFO] [stderr] 40 |     let both_integer = PointB { x: 5, y: 10 };
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: consider prefixing with an underscore: `_both_integer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `both_float`
[INFO] [stderr]   --> src/gennic.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |     let both_float = PointB { x: 1.0, y: 4.0 };
[INFO] [stderr]    |         ^^^^^^^^^^ help: consider prefixing with an underscore: `_both_float`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `integer_and_float`
[INFO] [stderr]   --> src/gennic.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |     let integer_and_float = PointB { x: 5, y: 4.0 };
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_integer_and_float`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `item2`
[INFO] [stderr]   --> src/traits.rs:16:37
[INFO] [stderr]    |
[INFO] [stderr] 16 | pub fn notyfy<T: Summary>(item1: T, item2: T) {
[INFO] [stderr]    |                                     ^^^^^ help: consider prefixing with an underscore: `_item2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]   --> src/traits.rs:24:62
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn some_function_a<T: Display + Clone, U: Clone + Debug>(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/traits.rs:24:68
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn some_function_a<T: Display + Clone, U: Clone + Debug>(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/traits.rs:28:26
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn some_function_b<T, U>(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/traits.rs:28:32
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn some_function_b<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                                ^ help: consider prefixing with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/lifetimes.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list`
[INFO] [stderr]   --> src/boxpoints.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let list = Cons(1,
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_list`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `d`
[INFO] [stderr]   --> src/drop.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let d = CustomSmartPointer { data: String::from("other stuff") };
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_d`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/rc.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let b = Cons(3, Rc::clone(&a));
[INFO] [stderr]    |             ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/rc.rs:21:17
[INFO] [stderr]    |
[INFO] [stderr] 21 |             let c = Cons(4, Rc::clone(&a));
[INFO] [stderr]    |                 ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::trim_left': superseded by `trim_start`
[INFO] [stderr]    --> src/lib.rs:112:31
[INFO] [stderr]     |
[INFO] [stderr] 112 |             results.push(line.trim_left());
[INFO] [stderr]     |                               ^^^^^^^^^ help: replace the use of the deprecated item: `trim_start`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::trim_left': superseded by `trim_start`
[INFO] [stderr]    --> src/lib.rs:125:31
[INFO] [stderr]     |
[INFO] [stderr] 125 |             results.push(line.trim_left());
[INFO] [stderr]     |                               ^^^^^^^^^ help: replace the use of the deprecated item: `trim_start`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]  --> src/slices.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let hello = &s[0..5];
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_hello`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]  --> src/slices.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let hello = &s[0..=4];
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]  --> src/slices.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let hello = &s[..5];
[INFO] [stderr]   |         ^^^^^ help: consider prefixing with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/slices.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let world = &s[6..11];
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/slices.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let world = &s[6..=10];
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/slices.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let world = &s[6..len];
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/slices.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let world = &s[6..];
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello_world`
[INFO] [stderr]   --> src/slices.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let hello_world = &s[0..len];
[INFO] [stderr]    |         ^^^^^^^^^^^ help: consider prefixing with an underscore: `_hello_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello_world`
[INFO] [stderr]   --> src/slices.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let hello_world = &s[..];
[INFO] [stderr]    |         ^^^^^^^^^^^ help: consider prefixing with an underscore: `_hello_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user2`
[INFO] [stderr]   --> src/structs.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let user2 = User {
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_user2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user3`
[INFO] [stderr]   --> src/structs.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let user3 = User {
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_user3`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `black`
[INFO] [stderr]   --> src/structs.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     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/structs.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let origin = Point(0, 0, 0);
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_origin`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `four`
[INFO] [stderr]   --> src/enums.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let four = IpAddKind::V4;
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_four`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/enums.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let six = IpAddKind::V6;
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enums.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let home = IpAddr {
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loopback`
[INFO] [stderr]   --> src/enums.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let loopback = IpAddr {
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enums.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let home = IpAddr::V4(String::from("127.0.0.1"));
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loopback`
[INFO] [stderr]   --> src/enums.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |     let loopback = IpAddr::V6(String::from("::1"));
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/enums.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |     let home = IpAddr::V4(127, 0, 0, 1);
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loopback`
[INFO] [stderr]   --> src/enums.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let loopback = IpAddr::V6(String::from("::1"));
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/matchs.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 |     let six = plus_one(five);
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]   --> src/matchs.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     let none = plus_one(None);
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `count` is assigned to, but never used
[INFO] [stderr]   --> src/iflet.rs:16:13
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let mut count = 0;
[INFO] [stderr]    |             ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_count` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `count` is never read
[INFO] [stderr]   --> src/iflet.rs:19:14
[INFO] [stderr]    |
[INFO] [stderr] 19 |         _ => count += 1,
[INFO] [stderr]    |              ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `count` is assigned to, but never used
[INFO] [stderr]   --> src/iflet.rs:24:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let mut count = 0;
[INFO] [stderr]    |             ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_count` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `count` is never read
[INFO] [stderr]   --> src/iflet.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |         count += 1;
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]  --> src/vectors.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let v: Vec<i32> = Vec::new();
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]  --> src/vectors.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let a = vec![1, 2, 3];
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/vectors.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let six = &b[1];
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_six`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row`
[INFO] [stderr]   --> src/vectors.rs:40:9
[INFO] [stderr]    |
[INFO] [stderr] 40 |     let row = vec![
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_row`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/strings.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let s = data.to_string();
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/strings.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let s = "initial content".to_string();
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/strings.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let s = String::from("initial content");
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/strings.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     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/hashmaps.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let s: HashMap<_, _> = teams.iter().zip(initial_scores.iter()).collect();
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `score`
[INFO] [stderr]   --> src/hashmaps.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let score = scores.get(&team_name);
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_score`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/errors.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let f = match f {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/errors.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let f = File::open("hello.txt").map_err(|error| {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/errors.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let f = File::open("hello.txt").unwrap();
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/errors.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `flot`
[INFO] [stderr]   --> src/gennic.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let flot = PointA { x: 1.0, y: 4.0 };
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_flot`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `both_integer`
[INFO] [stderr]   --> src/gennic.rs:40:9
[INFO] [stderr]    |
[INFO] [stderr] 40 |     let both_integer = PointB { x: 5, y: 10 };
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: consider prefixing with an underscore: `_both_integer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `both_float`
[INFO] [stderr]   --> src/gennic.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |     let both_float = PointB { x: 1.0, y: 4.0 };
[INFO] [stderr]    |         ^^^^^^^^^^ help: consider prefixing with an underscore: `_both_float`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `integer_and_float`
[INFO] [stderr]   --> src/gennic.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |     let integer_and_float = PointB { x: 5, y: 4.0 };
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_integer_and_float`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `item2`
[INFO] [stderr]   --> src/traits.rs:16:37
[INFO] [stderr]    |
[INFO] [stderr] 16 | pub fn notyfy<T: Summary>(item1: T, item2: T) {
[INFO] [stderr]    |                                     ^^^^^ help: consider prefixing with an underscore: `_item2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]   --> src/traits.rs:24:62
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn some_function_a<T: Display + Clone, U: Clone + Debug>(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/traits.rs:24:68
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn some_function_a<T: Display + Clone, U: Clone + Debug>(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/traits.rs:28:26
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn some_function_b<T, U>(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/traits.rs:28:32
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn some_function_b<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                                ^ help: consider prefixing with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/lifetimes.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list`
[INFO] [stderr]   --> src/boxpoints.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let list = Cons(1,
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_list`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first`
[INFO] [stderr]  --> src/slices.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn first() {
[INFO] [stderr]   | ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word_a`
[INFO] [stderr]   --> src/slices.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn first_word_a(s: &String) -> usize {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word_b`
[INFO] [stderr]   --> src/slices.rs:31:1
[INFO] [stderr]    |
[INFO] [stderr] 31 | fn first_word_b(s: &str) -> &str {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `User`
[INFO] [stderr]  --> src/structs.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct User {
[INFO] [stderr]   | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/structs.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/structs.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `build_user`
[INFO] [stderr]   --> src/structs.rs:40:1
[INFO] [stderr]    |
[INFO] [stderr] 40 | fn build_user(username: String, email: String) -> User {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `area_a`
[INFO] [stderr]   --> src/structs.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn area_a(width: u32, height: u32) -> u32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `area_b`
[INFO] [stderr]   --> src/structs.rs:55:1
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn area_b(dimensions: (u32, u32)) -> u32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Rectangle`
[INFO] [stderr]   --> src/structs.rs:60:1
[INFO] [stderr]    |
[INFO] [stderr] 60 | struct Rectangle {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `area`
[INFO] [stderr]   --> src/structs.rs:66:5
[INFO] [stderr]    |
[INFO] [stderr] 66 |     pub fn area(&self) -> u32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `can_hold`
[INFO] [stderr]   --> src/structs.rs:70:5
[INFO] [stderr]    |
[INFO] [stderr] 70 |     pub fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `square`
[INFO] [stderr]   --> src/structs.rs:76:5
[INFO] [stderr]    |
[INFO] [stderr] 76 |     fn square(size: u32) -> Rectangle {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `area_c`
[INFO] [stderr]   --> src/structs.rs:81:1
[INFO] [stderr]    |
[INFO] [stderr] 81 | fn area_c(rectangle: &Rectangle) -> u32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/enums.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/enums.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `c`
[INFO] [stderr]   --> src/enums.rs:36:1
[INFO] [stderr]    |
[INFO] [stderr] 36 | fn c() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `value_in_cents`
[INFO] [stderr]   --> src/matchs.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn value_in_cents(coin: Coin) -> u32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `plus_one`
[INFO] [stderr]   --> src/matchs.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/matchs.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn a() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/matchs.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/iflet.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/iflet.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn b(coin: Coin) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `c`
[INFO] [stderr]   --> src/iflet.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn c(coin: Coin) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]  --> src/modules.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |         pub fn clarinet() {
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `breathe_in`
[INFO] [stderr]  --> src/modules.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fn breathe_in() {}
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fna`
[INFO] [stderr]   --> src/modules.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         fn fna() {
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]   --> src/modules.rs:23:17
[INFO] [stderr]    |
[INFO] [stderr] 23 |                 pub fn clarinet() {}
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fna`
[INFO] [stderr]   --> src/modules.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |         fn fna() {
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fna`
[INFO] [stderr]   --> src/modules.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |         fn fna() {
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/modules.rs:47:1
[INFO] [stderr]    |
[INFO] [stderr] 47 | fn a() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Vegetable`
[INFO] [stderr]   --> src/modules.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     pub struct Vegetable {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/modules.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |         pub fn new(name: &str) -> Vegetable {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/vectors.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/vectors.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `c`
[INFO] [stderr]   --> src/vectors.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn c() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `d`
[INFO] [stderr]   --> src/vectors.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn d() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/strings.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/strings.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `c`
[INFO] [stderr]   --> src/strings.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn c() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/hashmaps.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/hashmaps.rs:27:1
[INFO] [stderr]    |
[INFO] [stderr] 27 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/errors.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file`
[INFO] [stderr]   --> src/errors.rs:37:1
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_a`
[INFO] [stderr]   --> src/errors.rs:53:1
[INFO] [stderr]    |
[INFO] [stderr] 53 | fn read_username_from_file_a() -> Result<String, io::Error> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_b`
[INFO] [stderr]   --> src/errors.rs:62:1
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn read_username_from_file_b() -> Result<String, io::Error> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_c`
[INFO] [stderr]   --> src/errors.rs:70:1
[INFO] [stderr]    |
[INFO] [stderr] 70 | fn read_username_from_file_c() -> Result<String, io::Error> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `PointA`
[INFO] [stderr]  --> src/gennic.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct PointA<T> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `x`
[INFO] [stderr]  --> src/gennic.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     fn x(&self) -> &T {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `distance_from_origin`
[INFO] [stderr]   --> src/gennic.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `PointB`
[INFO] [stderr]   --> src/gennic.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | struct PointB<T, U> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `mixup`
[INFO] [stderr]   --> src/gennic.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn mixup<V, W>(self, other: PointB<V, W>) -> PointB<T, W> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/gennic.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn a() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/gennic.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `some_function_b`
[INFO] [stderr]   --> src/traits.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | / fn some_function_b<T, U>(t: T, u: U) -> i32
[INFO] [stderr] 29 | |     where T: Display + Clone,
[INFO] [stderr] 30 | |           U: Clone + Debug {
[INFO] [stderr] 31 | |     7
[INFO] [stderr] 32 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/lifetimes.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/lifetimes.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn a() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `shoes_in_my_size`
[INFO] [stderr]  --> src/iterators.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Counter`
[INFO] [stderr]   --> src/iterators.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | struct Counter {
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/iterators.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     fn new() -> Counter {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/iterators.rs:37:1
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn a() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/boxpoints.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `List`
[INFO] [stderr]  --> src/boxpoints.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | enum List {
[INFO] [stderr]   | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/boxpoints.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/deref.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/deref.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `MyBox`
[INFO] [stderr]   --> src/deref.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | struct MyBox<T>(T);
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/deref.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     fn new(x: T) -> MyBox<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `CustomSmartPointer`
[INFO] [stderr]  --> src/drop.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct CustomSmartPointer {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `List`
[INFO] [stderr]  --> src/rc.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | enum List {
[INFO] [stderr]   | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new_a`
[INFO] [stderr]   --> src/lib.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     fn new_a(args: &[String]) -> Config {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_config_a`
[INFO] [stderr]   --> src/lib.rs:95:1
[INFO] [stderr]    |
[INFO] [stderr] 95 | fn parse_config_a(args: &[String]) -> (&str, &str) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `search_a`
[INFO] [stderr]    --> src/lib.rs:107:1
[INFO] [stderr]     |
[INFO] [stderr] 107 | fn search_a<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first`
[INFO] [stderr]  --> src/slices.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn first() {
[INFO] [stderr]   | ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `User`
[INFO] [stderr]  --> src/structs.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct User {
[INFO] [stderr]   | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/structs.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/structs.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `build_user`
[INFO] [stderr]   --> src/structs.rs:40:1
[INFO] [stderr]    |
[INFO] [stderr] 40 | fn build_user(username: String, email: String) -> User {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `square`
[INFO] [stderr]   --> src/structs.rs:76:5
[INFO] [stderr]    |
[INFO] [stderr] 76 |     fn square(size: u32) -> Rectangle {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/enums.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/enums.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `c`
[INFO] [stderr]   --> src/enums.rs:36:1
[INFO] [stderr]    |
[INFO] [stderr] 36 | fn c() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `value_in_cents`
[INFO] [stderr]   --> src/matchs.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn value_in_cents(coin: Coin) -> u32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `plus_one`
[INFO] [stderr]   --> src/matchs.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/matchs.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn a() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/matchs.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/iflet.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/iflet.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn b(coin: Coin) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `c`
[INFO] [stderr]   --> src/iflet.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn c(coin: Coin) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]  --> src/modules.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |         pub fn clarinet() {
[INFO] [stderr]   |         ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `breathe_in`
[INFO] [stderr]  --> src/modules.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fn breathe_in() {}
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fna`
[INFO] [stderr]   --> src/modules.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |         fn fna() {
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]   --> src/modules.rs:23:17
[INFO] [stderr]    |
[INFO] [stderr] 23 |                 pub fn clarinet() {}
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fna`
[INFO] [stderr]   --> src/modules.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |         fn fna() {
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fna`
[INFO] [stderr]   --> src/modules.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |         fn fna() {
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/modules.rs:47:1
[INFO] [stderr]    |
[INFO] [stderr] 47 | fn a() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `id`
[INFO] [stderr]   --> src/modules.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |         id: i32,
[INFO] [stderr]    |         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/vectors.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/vectors.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `c`
[INFO] [stderr]   --> src/vectors.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn c() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `d`
[INFO] [stderr]   --> src/vectors.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn d() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/strings.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/strings.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `c`
[INFO] [stderr]   --> src/strings.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn c() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/hashmaps.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/hashmaps.rs:27:1
[INFO] [stderr]    |
[INFO] [stderr] 27 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/errors.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file`
[INFO] [stderr]   --> src/errors.rs:37:1
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_a`
[INFO] [stderr]   --> src/errors.rs:53:1
[INFO] [stderr]    |
[INFO] [stderr] 53 | fn read_username_from_file_a() -> Result<String, io::Error> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_b`
[INFO] [stderr]   --> src/errors.rs:62:1
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn read_username_from_file_b() -> Result<String, io::Error> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_c`
[INFO] [stderr]   --> src/errors.rs:70:1
[INFO] [stderr]    |
[INFO] [stderr] 70 | fn read_username_from_file_c() -> Result<String, io::Error> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `PointA`
[INFO] [stderr]  --> src/gennic.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct PointA<T> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `x`
[INFO] [stderr]  --> src/gennic.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     fn x(&self) -> &T {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `distance_from_origin`
[INFO] [stderr]   --> src/gennic.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/gennic.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn a() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/gennic.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `some_function_b`
[INFO] [stderr]   --> src/traits.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | / fn some_function_b<T, U>(t: T, u: U) -> i32
[INFO] [stderr] 29 | |     where T: Display + Clone,
[INFO] [stderr] 30 | |           U: Clone + Debug {
[INFO] [stderr] 31 | |     7
[INFO] [stderr] 32 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/lifetimes.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/lifetimes.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn a() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/iterators.rs:37:1
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn a() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/boxpoints.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `List`
[INFO] [stderr]  --> src/boxpoints.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | enum List {
[INFO] [stderr]   | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/boxpoints.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]  --> src/deref.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn a() {
[INFO] [stderr]   | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/deref.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn b() {
[INFO] [stderr]    | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new_a`
[INFO] [stderr]   --> src/lib.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     fn new_a(args: &[String]) -> Config {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_config_a`
[INFO] [stderr]   --> src/lib.rs:95:1
[INFO] [stderr]    |
[INFO] [stderr] 95 | fn parse_config_a(args: &[String]) -> (&str, &str) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `search_a`
[INFO] [stderr]    --> src/lib.rs:107:1
[INFO] [stderr]     |
[INFO] [stderr] 107 | fn search_a<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::error::Error`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::error::Error;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::error::Error`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::error::Error;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fs;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `chapter12`
[INFO] [stderr]   --> src/main.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn chapter12() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `chapter13`
[INFO] [stderr]   --> src/main.rs:41:1
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn chapter13() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout_a`
[INFO] [stderr]    --> src/main.rs:104:1
[INFO] [stderr]     |
[INFO] [stderr] 104 | fn generate_workout_a(intensity: u32, random_number: u32) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout_b`
[INFO] [stderr]    --> src/main.rs:117:1
[INFO] [stderr]     |
[INFO] [stderr] 117 | fn generate_workout_b(intensity: u32, random_number: u32) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout_c`
[INFO] [stderr]    --> src/main.rs:132:1
[INFO] [stderr]     |
[INFO] [stderr] 132 | fn generate_workout_c(intensity: u32, random_number: u32) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `simulated_expensive_calculation`
[INFO] [stderr]    --> src/main.rs:157:1
[INFO] [stderr]     |
[INFO] [stderr] 157 | fn simulated_expensive_calculation(intensity: u32) -> u32 {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]    --> src/main.rs:163:1
[INFO] [stderr]     |
[INFO] [stderr] 163 | fn a() {
[INFO] [stderr]     | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `guess_game`
[INFO] [stderr]    --> src/main.rs:168:1
[INFO] [stderr]     |
[INFO] [stderr] 168 | fn guess_game() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]    --> src/main.rs:199:9
[INFO] [stderr]     |
[INFO] [stderr] 199 |         pub fn clarinet() {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet_trio`
[INFO] [stderr]    --> src/main.rs:208:5
[INFO] [stderr]     |
[INFO] [stderr] 208 |     pub fn clarinet_trio() {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `chapter12`
[INFO] [stderr]   --> src/main.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn chapter12() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `chapter13`
[INFO] [stderr]   --> src/main.rs:41:1
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn chapter13() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout_a`
[INFO] [stderr]    --> src/main.rs:104:1
[INFO] [stderr]     |
[INFO] [stderr] 104 | fn generate_workout_a(intensity: u32, random_number: u32) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout_b`
[INFO] [stderr]    --> src/main.rs:117:1
[INFO] [stderr]     |
[INFO] [stderr] 117 | fn generate_workout_b(intensity: u32, random_number: u32) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout_c`
[INFO] [stderr]    --> src/main.rs:132:1
[INFO] [stderr]     |
[INFO] [stderr] 132 | fn generate_workout_c(intensity: u32, random_number: u32) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `simulated_expensive_calculation`
[INFO] [stderr]    --> src/main.rs:157:1
[INFO] [stderr]     |
[INFO] [stderr] 157 | fn simulated_expensive_calculation(intensity: u32) -> u32 {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]    --> src/main.rs:163:1
[INFO] [stderr]     |
[INFO] [stderr] 163 | fn a() {
[INFO] [stderr]     | ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `guess_game`
[INFO] [stderr]    --> src/main.rs:168:1
[INFO] [stderr]     |
[INFO] [stderr] 168 | fn guess_game() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet`
[INFO] [stderr]    --> src/main.rs:199:9
[INFO] [stderr]     |
[INFO] [stderr] 199 |         pub fn clarinet() {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `clarinet_trio`
[INFO] [stderr]    --> src/main.rs:208:5
[INFO] [stderr]     |
[INFO] [stderr] 208 |     pub fn clarinet_trio() {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.53s
[INFO] running `"docker" "inspect" "d80e541cb7f018d7469a5f9c3214c4b4aaf3b37b92f316246790bb8d3a040e06"`
[INFO] running `"docker" "rm" "-f" "d80e541cb7f018d7469a5f9c3214c4b4aaf3b37b92f316246790bb8d3a040e06"`
[INFO] [stdout] d80e541cb7f018d7469a5f9c3214c4b4aaf3b37b92f316246790bb8d3a040e06