[INFO] cloning repository https://github.com/khajavi/TheJoyOfRust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/khajavi/TheJoyOfRust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhajavi%2FTheJoyOfRust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhajavi%2FTheJoyOfRust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a22148f710b5be631f4a16b46a9e13e272edbafa
[INFO] checking khajavi/TheJoyOfRust against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhajavi%2FTheJoyOfRust" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/khajavi/TheJoyOfRust on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/khajavi/TheJoyOfRust
[INFO] finished tweaking git repo https://github.com/khajavi/TheJoyOfRust
[INFO] tweaked toml for git repo https://github.com/khajavi/TheJoyOfRust written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/khajavi/TheJoyOfRust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2726e3b1e6c09d1ae440f309c9023448ea02f4b10a22f0b1a54620b13078d1e8
[INFO] running `Command { std: "docker" "start" "-a" "2726e3b1e6c09d1ae440f309c9023448ea02f4b10a22f0b1a54620b13078d1e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2726e3b1e6c09d1ae440f309c9023448ea02f4b10a22f0b1a54620b13078d1e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2726e3b1e6c09d1ae440f309c9023448ea02f4b10a22f0b1a54620b13078d1e8", kill_on_drop: false }`
[INFO] [stdout] 2726e3b1e6c09d1ae440f309c9023448ea02f4b10a22f0b1a54620b13078d1e8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0b6a0ed9863bf110757f8b0cfcba89a2fa124a30f3be5b9ccb240c028da9e820
[INFO] running `Command { std: "docker" "start" "-a" "0b6a0ed9863bf110757f8b0cfcba89a2fa124a30f3be5b9ccb240c028da9e820", kill_on_drop: false }`
[INFO] [stderr]     Checking TheJoyOfRust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: named argument `first` is not used by name
[INFO] [stdout]    --> src/main.rs:146:34
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |               ----               ^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |               |
[INFO] [stdout]     |               this formatting argument uses named argument `first` by position
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(named_arguments_used_positionally)]` on by default
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{first:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `second` is not used by name
[INFO] [stdout]    --> src/main.rs:146:55
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                     ----                              ^^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     this formatting argument uses named argument `second` by position
[INFO] [stdout]     |
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {second:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                      ++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `third` is not used by name
[INFO] [stdout]    --> src/main.rs:146:75
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                           ----                                            ^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           this formatting argument uses named argument `third` by position
[INFO] [stdout]     |
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {third:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/main.rs:299:9
[INFO] [stdout]     |
[INFO] [stdout] 299 |         'inner: loop {
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:588:5
[INFO] [stdout]     |
[INFO] [stdout] 588 |     ;
[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/main.rs:590:5
[INFO] [stdout]     |
[INFO] [stdout] 590 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:592:5
[INFO] [stdout]     |
[INFO] [stdout] 592 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:594:5
[INFO] [stdout]     |
[INFO] [stdout] 594 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `first` is not used by name
[INFO] [stdout]    --> src/main.rs:146:34
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |               ----               ^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |               |
[INFO] [stdout]     |               this formatting argument uses named argument `first` by position
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(named_arguments_used_positionally)]` on by default
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{first:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `second` is not used by name
[INFO] [stdout]    --> src/main.rs:146:55
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                     ----                              ^^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     this formatting argument uses named argument `second` by position
[INFO] [stdout]     |
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {second:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                      ++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `third` is not used by name
[INFO] [stdout]    --> src/main.rs:146:75
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                           ----                                            ^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           this formatting argument uses named argument `third` by position
[INFO] [stdout]     |
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {third:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/main.rs:299:9
[INFO] [stdout]     |
[INFO] [stdout] 299 |         'inner: loop {
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:588:5
[INFO] [stdout]     |
[INFO] [stdout] 588 |     ;
[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/main.rs:590:5
[INFO] [stdout]     |
[INFO] [stdout] 590 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:592:5
[INFO] [stdout]     |
[INFO] [stdout] 592 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:594:5
[INFO] [stdout]     |
[INFO] [stdout] 594 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:299:9
[INFO] [stdout]     |
[INFO] [stdout] 295 |               break;
[INFO] [stdout]     |               ----- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 299 | /         'inner: loop {
[INFO] [stdout] 300 | |             println!("inner");
[INFO] [stdout] 301 | |             break 'outer;
[INFO] [stdout] 302 | |         }
[INFO] [stdout]     | |_________^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:299:9
[INFO] [stdout]     |
[INFO] [stdout] 295 |               break;
[INFO] [stdout]     |               ----- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 299 | /         'inner: loop {
[INFO] [stdout] 300 | |             println!("inner");
[INFO] [stdout] 301 | |             break 'outer;
[INFO] [stdout] 302 | |         }
[INFO] [stdout]     | |_________^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `my_string`
[INFO] [stdout]    --> src/main.rs:210:9
[INFO] [stdout]     |
[INFO] [stdout] 210 |     let my_string = String::from(my_str);
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/main.rs:246:13
[INFO] [stdout]     |
[INFO] [stdout] 246 |         Err(e) => 0
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `my_string`
[INFO] [stdout]    --> src/main.rs:210:9
[INFO] [stdout]     |
[INFO] [stdout] 210 |     let my_string = String::from(my_str);
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/main.rs:246:13
[INFO] [stdout]     |
[INFO] [stdout] 246 |         Err(e) => 0
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:524:25
[INFO] [stdout]     |
[INFO] [stdout] 524 |     fn work_with_string(s: String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:531:25
[INFO] [stdout]     |
[INFO] [stdout] 531 |     fn work_with_string(s: String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:539:22
[INFO] [stdout]     |
[INFO] [stdout] 539 |     fn work_with_i32(i: i32) {}
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:548:25
[INFO] [stdout]     |
[INFO] [stdout] 548 |     fn work_with_string(s: &String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `take_ownership`
[INFO] [stdout]    --> src/main.rs:552:19
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_take_ownership`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read_only_borrow`
[INFO] [stdout]    --> src/main.rs:552:43
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_read_only_borrow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mutable_borrow`
[INFO] [stdout]    --> src/main.rs:552:67
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                                                                   ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mutable_borrow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `empty`
[INFO] [stdout]    --> src/main.rs:649:9
[INFO] [stdout]     |
[INFO] [stdout] 649 |     let empty = Empty;
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_empty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `null`
[INFO] [stdout]    --> src/main.rs:650:9
[INFO] [stdout]     |
[INFO] [stdout] 650 |     let null = Null;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_null`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:524:25
[INFO] [stdout]     |
[INFO] [stdout] 524 |     fn work_with_string(s: String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:531:25
[INFO] [stdout]     |
[INFO] [stdout] 531 |     fn work_with_string(s: String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:539:22
[INFO] [stdout]     |
[INFO] [stdout] 539 |     fn work_with_i32(i: i32) {}
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:548:25
[INFO] [stdout]     |
[INFO] [stdout] 548 |     fn work_with_string(s: &String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `take_ownership`
[INFO] [stdout]    --> src/main.rs:552:19
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_take_ownership`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read_only_borrow`
[INFO] [stdout]    --> src/main.rs:552:43
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_read_only_borrow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mutable_borrow`
[INFO] [stdout]    --> src/main.rs:552:67
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                                                                   ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mutable_borrow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:834:18
[INFO] [stdout]     |
[INFO] [stdout] 834 |             for (i, c) in self.listeners.iter() {
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:850:13
[INFO] [stdout]     |
[INFO] [stdout] 850 |         let x = 5;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `empty`
[INFO] [stdout]    --> src/main.rs:649:9
[INFO] [stdout]     |
[INFO] [stdout] 649 |     let empty = Empty;
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_empty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `null`
[INFO] [stdout]    --> src/main.rs:650:9
[INFO] [stdout]     |
[INFO] [stdout] 650 |     let null = Null;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_null`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]    --> src/main.rs:879:9
[INFO] [stdout]     |
[INFO] [stdout] 879 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:960:9
[INFO] [stdout]     |
[INFO] [stdout] 960 |     let c = CustomSmartPointer {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:965:13
[INFO] [stdout]     |
[INFO] [stdout] 965 |         let d = CustomSmartPointer {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]     --> src/main.rs:1005:9
[INFO] [stdout]      |
[INFO] [stdout] 1005 |     let b = Cons(3, Rc::clone(&a));
[INFO] [stdout]      |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]     --> src/main.rs:1008:13
[INFO] [stdout]      |
[INFO] [stdout] 1008 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]      |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]     --> src/main.rs:1016:9
[INFO] [stdout]      |
[INFO] [stdout] 1016 |     let b1 = Cons(3, a1.clone());
[INFO] [stdout]      |         ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]     --> src/main.rs:1017:9
[INFO] [stdout]      |
[INFO] [stdout] 1017 |     let c1 = Cons(4, a1.clone());
[INFO] [stdout]      |         ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Second` is never constructed
[INFO] [stdout]   --> src/main.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |     enum Day {
[INFO] [stdout]    |          --- variant in this enum
[INFO] [stdout] 77 |         First,
[INFO] [stdout] 78 |         Second,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rich` is never constructed
[INFO] [stdout]   --> src/main.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 92 | enum Status {
[INFO] [stdout]    |      ------ variant in this enum
[INFO] [stdout] 93 |     Rich,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Status` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `One` and `Three` are never constructed
[INFO] [stdout]    --> src/main.rs:99:5
[INFO] [stdout]     |
[INFO] [stdout] 98  | enum Number {
[INFO] [stdout]     |      ------ variants in this enum
[INFO] [stdout] 99  |     One = 1,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 100 |     Two = 2,
[INFO] [stdout] 101 |     Three = 3,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:117:14
[INFO] [stdout]     |
[INFO] [stdout] 117 |         Cons(i32, Box<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 117 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inference_example` is never used
[INFO] [stdout]    --> src/main.rs:198:4
[INFO] [stdout]     |
[INFO] [stdout] 198 | fn inference_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `type_aliasing_example` is never used
[INFO] [stdout]    --> src/main.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn type_aliasing_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]    --> src/main.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 214 |     struct Number {
[INFO] [stdout]     |            ------ field in this struct
[INFO] [stdout] 215 |         value: i32
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_example` is never used
[INFO] [stdout]    --> src/main.rs:360:4
[INFO] [stdout]     |
[INFO] [stdout] 360 | fn match_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:362:4
[INFO] [stdout]     |
[INFO] [stdout] 362 | fn tuple_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `enum_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:364:4
[INFO] [stdout]     |
[INFO] [stdout] 364 | fn enum_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `struct_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:391:4
[INFO] [stdout]     |
[INFO] [stdout] 391 | fn struct_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_guard` is never used
[INFO] [stdout]    --> src/main.rs:393:4
[INFO] [stdout]     |
[INFO] [stdout] 393 | fn match_guard() {}
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_binding` is never used
[INFO] [stdout]    --> src/main.rs:395:4
[INFO] [stdout]     |
[INFO] [stdout] 395 | fn match_binding() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Foo` and `Bar` are never constructed
[INFO] [stdout]    --> src/main.rs:406:9
[INFO] [stdout]     |
[INFO] [stdout] 405 |     enum Event {
[INFO] [stdout]     |          ----- variants in this enum
[INFO] [stdout] 406 |         Foo,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 407 |         Bar,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_example` is never used
[INFO] [stdout]    --> src/main.rs:432:4
[INFO] [stdout]     |
[INFO] [stdout] 432 | fn function_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_fn` is never used
[INFO] [stdout]    --> src/main.rs:552:8
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generic_example` is never used
[INFO] [stdout]    --> src/main.rs:572:4
[INFO] [stdout]     |
[INFO] [stdout] 572 | fn generic_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:584:12
[INFO] [stdout]     |
[INFO] [stdout] 584 |     struct S(A);
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:604:12
[INFO] [stdout]     |
[INFO] [stdout] 604 |     struct S;
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GenericVal` is never constructed
[INFO] [stdout]    --> src/main.rs:605:12
[INFO] [stdout]     |
[INFO] [stdout] 605 |     struct GenericVal<T>(T);
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generic_trait_example` is never used
[INFO] [stdout]    --> src/main.rs:637:4
[INFO] [stdout]     |
[INFO] [stdout] 637 | fn generic_trait_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printer` is never used
[INFO] [stdout]    --> src/main.rs:656:8
[INFO] [stdout]     |
[INFO] [stdout] 656 |     fn printer<T: Display>(t: T) { println!("{}", t); }
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:658:12
[INFO] [stdout]     |
[INFO] [stdout] 658 |     struct S<T: Display>(T);
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]    --> src/main.rs:670:8
[INFO] [stdout]     |
[INFO] [stdout] 670 |     fn area<T: HasArea>(t: &T) -> f64 { t.area() }
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]    --> src/main.rs:758:9
[INFO] [stdout]     |
[INFO] [stdout] 757 |     struct Point {
[INFO] [stdout]     |            ----- fields in this struct
[INFO] [stdout] 758 |         x: f64,
[INFO] [stdout]     |         ^
[INFO] [stdout] 759 |         y: f64,
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `mouse_y` is never read
[INFO] [stdout]    --> src/main.rs:796:36
[INFO] [stdout]     |
[INFO] [stdout] 796 |     struct OnClick { mouse_x: f32, mouse_y: f32 }
[INFO] [stdout]     |            -------                 ^^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `OnClick` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]    --> src/main.rs:859:8
[INFO] [stdout]     |
[INFO] [stdout] 859 |     fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:874:14
[INFO] [stdout]     |
[INFO] [stdout] 874 |         Cons(i32, Box<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 874 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/main.rs:951:9
[INFO] [stdout]     |
[INFO] [stdout] 950 |     struct CustomSmartPointer {
[INFO] [stdout]     |            ------------------ field in this struct
[INFO] [stdout] 951 |         data: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/main.rs:975:9
[INFO] [stdout]     |
[INFO] [stdout] 974 |     struct CustomSmartPointer {
[INFO] [stdout]     |            ------------------ field in this struct
[INFO] [stdout] 975 |         data: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:996:14
[INFO] [stdout]     |
[INFO] [stdout] 996 |         Cons(i32, Rc<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 996 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]    --> src/main.rs:260:9
[INFO] [stdout]     |
[INFO] [stdout] 260 |         5 + 3;
[INFO] [stdout]     |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 260 |         let _ = 5 + 3;
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `str_vs_String_example` should have a snake case name
[INFO] [stdout]    --> src/main.rs:555:4
[INFO] [stdout]     |
[INFO] [stdout] 555 | fn str_vs_String_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `str_vs_string_example`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:834:18
[INFO] [stdout]     |
[INFO] [stdout] 834 |             for (i, c) in self.listeners.iter() {
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:850:13
[INFO] [stdout]     |
[INFO] [stdout] 850 |         let x = 5;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]    --> src/main.rs:879:9
[INFO] [stdout]     |
[INFO] [stdout] 879 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 62 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:960:9
[INFO] [stdout]     |
[INFO] [stdout] 960 |     let c = CustomSmartPointer {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:965:13
[INFO] [stdout]     |
[INFO] [stdout] 965 |         let d = CustomSmartPointer {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]     --> src/main.rs:1005:9
[INFO] [stdout]      |
[INFO] [stdout] 1005 |     let b = Cons(3, Rc::clone(&a));
[INFO] [stdout]      |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]     --> src/main.rs:1008:13
[INFO] [stdout]      |
[INFO] [stdout] 1008 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]      |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]     --> src/main.rs:1016:9
[INFO] [stdout]      |
[INFO] [stdout] 1016 |     let b1 = Cons(3, a1.clone());
[INFO] [stdout]      |         ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]     --> src/main.rs:1017:9
[INFO] [stdout]      |
[INFO] [stdout] 1017 |     let c1 = Cons(4, a1.clone());
[INFO] [stdout]      |         ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Second` is never constructed
[INFO] [stdout]   --> src/main.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |     enum Day {
[INFO] [stdout]    |          --- variant in this enum
[INFO] [stdout] 77 |         First,
[INFO] [stdout] 78 |         Second,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rich` is never constructed
[INFO] [stdout]   --> src/main.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 92 | enum Status {
[INFO] [stdout]    |      ------ variant in this enum
[INFO] [stdout] 93 |     Rich,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Status` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `One` and `Three` are never constructed
[INFO] [stdout]    --> src/main.rs:99:5
[INFO] [stdout]     |
[INFO] [stdout] 98  | enum Number {
[INFO] [stdout]     |      ------ variants in this enum
[INFO] [stdout] 99  |     One = 1,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 100 |     Two = 2,
[INFO] [stdout] 101 |     Three = 3,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:117:14
[INFO] [stdout]     |
[INFO] [stdout] 117 |         Cons(i32, Box<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 117 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inference_example` is never used
[INFO] [stdout]    --> src/main.rs:198:4
[INFO] [stdout]     |
[INFO] [stdout] 198 | fn inference_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `type_aliasing_example` is never used
[INFO] [stdout]    --> src/main.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn type_aliasing_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]    --> src/main.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 214 |     struct Number {
[INFO] [stdout]     |            ------ field in this struct
[INFO] [stdout] 215 |         value: i32
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_example` is never used
[INFO] [stdout]    --> src/main.rs:360:4
[INFO] [stdout]     |
[INFO] [stdout] 360 | fn match_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:362:4
[INFO] [stdout]     |
[INFO] [stdout] 362 | fn tuple_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `enum_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:364:4
[INFO] [stdout]     |
[INFO] [stdout] 364 | fn enum_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `struct_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:391:4
[INFO] [stdout]     |
[INFO] [stdout] 391 | fn struct_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_guard` is never used
[INFO] [stdout]    --> src/main.rs:393:4
[INFO] [stdout]     |
[INFO] [stdout] 393 | fn match_guard() {}
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_binding` is never used
[INFO] [stdout]    --> src/main.rs:395:4
[INFO] [stdout]     |
[INFO] [stdout] 395 | fn match_binding() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Foo` and `Bar` are never constructed
[INFO] [stdout]    --> src/main.rs:406:9
[INFO] [stdout]     |
[INFO] [stdout] 405 |     enum Event {
[INFO] [stdout]     |          ----- variants in this enum
[INFO] [stdout] 406 |         Foo,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 407 |         Bar,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_example` is never used
[INFO] [stdout]    --> src/main.rs:432:4
[INFO] [stdout]     |
[INFO] [stdout] 432 | fn function_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_fn` is never used
[INFO] [stdout]    --> src/main.rs:552:8
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generic_example` is never used
[INFO] [stdout]    --> src/main.rs:572:4
[INFO] [stdout]     |
[INFO] [stdout] 572 | fn generic_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:584:12
[INFO] [stdout]     |
[INFO] [stdout] 584 |     struct S(A);
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:604:12
[INFO] [stdout]     |
[INFO] [stdout] 604 |     struct S;
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GenericVal` is never constructed
[INFO] [stdout]    --> src/main.rs:605:12
[INFO] [stdout]     |
[INFO] [stdout] 605 |     struct GenericVal<T>(T);
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generic_trait_example` is never used
[INFO] [stdout]    --> src/main.rs:637:4
[INFO] [stdout]     |
[INFO] [stdout] 637 | fn generic_trait_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printer` is never used
[INFO] [stdout]    --> src/main.rs:656:8
[INFO] [stdout]     |
[INFO] [stdout] 656 |     fn printer<T: Display>(t: T) { println!("{}", t); }
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:658:12
[INFO] [stdout]     |
[INFO] [stdout] 658 |     struct S<T: Display>(T);
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]    --> src/main.rs:670:8
[INFO] [stdout]     |
[INFO] [stdout] 670 |     fn area<T: HasArea>(t: &T) -> f64 { t.area() }
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]    --> src/main.rs:758:9
[INFO] [stdout]     |
[INFO] [stdout] 757 |     struct Point {
[INFO] [stdout]     |            ----- fields in this struct
[INFO] [stdout] 758 |         x: f64,
[INFO] [stdout]     |         ^
[INFO] [stdout] 759 |         y: f64,
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `mouse_y` is never read
[INFO] [stdout]    --> src/main.rs:796:36
[INFO] [stdout]     |
[INFO] [stdout] 796 |     struct OnClick { mouse_x: f32, mouse_y: f32 }
[INFO] [stdout]     |            -------                 ^^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `OnClick` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]    --> src/main.rs:859:8
[INFO] [stdout]     |
[INFO] [stdout] 859 |     fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:874:14
[INFO] [stdout]     |
[INFO] [stdout] 874 |         Cons(i32, Box<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 874 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/main.rs:951:9
[INFO] [stdout]     |
[INFO] [stdout] 950 |     struct CustomSmartPointer {
[INFO] [stdout]     |            ------------------ field in this struct
[INFO] [stdout] 951 |         data: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/main.rs:975:9
[INFO] [stdout]     |
[INFO] [stdout] 974 |     struct CustomSmartPointer {
[INFO] [stdout]     |            ------------------ field in this struct
[INFO] [stdout] 975 |         data: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:996:14
[INFO] [stdout]     |
[INFO] [stdout] 996 |         Cons(i32, Rc<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 996 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]    --> src/main.rs:260:9
[INFO] [stdout]     |
[INFO] [stdout] 260 |         5 + 3;
[INFO] [stdout]     |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 260 |         let _ = 5 + 3;
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `str_vs_String_example` should have a snake case name
[INFO] [stdout]    --> src/main.rs:555:4
[INFO] [stdout]     |
[INFO] [stdout] 555 | fn str_vs_String_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `str_vs_string_example`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 62 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.13s
[INFO] running `Command { std: "docker" "inspect" "0b6a0ed9863bf110757f8b0cfcba89a2fa124a30f3be5b9ccb240c028da9e820", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b6a0ed9863bf110757f8b0cfcba89a2fa124a30f3be5b9ccb240c028da9e820", kill_on_drop: false }`
[INFO] [stdout] 0b6a0ed9863bf110757f8b0cfcba89a2fa124a30f3be5b9ccb240c028da9e820
[INFO] checking khajavi/TheJoyOfRust against try#f9935d29d867449445ee008640ccca1bf1ae0889+rustflags=-Dtail_expr_drop_order for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhajavi%2FTheJoyOfRust" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/khajavi/TheJoyOfRust on toolchain f9935d29d867449445ee008640ccca1bf1ae0889
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/khajavi/TheJoyOfRust
[INFO] finished tweaking git repo https://github.com/khajavi/TheJoyOfRust
[INFO] tweaked toml for git repo https://github.com/khajavi/TheJoyOfRust written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/khajavi/TheJoyOfRust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 458222adcd24f5f5fe2ea0d6e05b56d2d63c8f3d08e9f5e0ad04a146354a9e1a
[INFO] running `Command { std: "docker" "start" "-a" "458222adcd24f5f5fe2ea0d6e05b56d2d63c8f3d08e9f5e0ad04a146354a9e1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "458222adcd24f5f5fe2ea0d6e05b56d2d63c8f3d08e9f5e0ad04a146354a9e1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "458222adcd24f5f5fe2ea0d6e05b56d2d63c8f3d08e9f5e0ad04a146354a9e1a", kill_on_drop: false }`
[INFO] [stdout] 458222adcd24f5f5fe2ea0d6e05b56d2d63c8f3d08e9f5e0ad04a146354a9e1a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dtail_expr_drop_order" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3e78c12f351d820f5eb9a0e4c50dccc9757b44d3ca928849cf995bced440246c
[INFO] running `Command { std: "docker" "start" "-a" "3e78c12f351d820f5eb9a0e4c50dccc9757b44d3ca928849cf995bced440246c", kill_on_drop: false }`
[INFO] [stderr]     Checking TheJoyOfRust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: named argument `first` is not used by name
[INFO] [stdout]    --> src/main.rs:146:34
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |               ----               ^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |               |
[INFO] [stdout]     |               this formatting argument uses named argument `first` by position
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(named_arguments_used_positionally)]` on by default
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{first:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `second` is not used by name
[INFO] [stdout]    --> src/main.rs:146:55
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                     ----                              ^^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     this formatting argument uses named argument `second` by position
[INFO] [stdout]     |
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {second:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                      ++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `third` is not used by name
[INFO] [stdout]    --> src/main.rs:146:75
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                           ----                                            ^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           this formatting argument uses named argument `third` by position
[INFO] [stdout]     |
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {third:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/main.rs:299:9
[INFO] [stdout]     |
[INFO] [stdout] 299 |         'inner: loop {
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `first` is not used by name
[INFO] [stdout]    --> src/main.rs:146:34
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |               ----               ^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |               |
[INFO] [stdout]     |               this formatting argument uses named argument `first` by position
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(named_arguments_used_positionally)]` on by default
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{first:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:588:5
[INFO] [stdout]     |
[INFO] [stdout] 588 |     ;
[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/main.rs:590:5
[INFO] [stdout]     |
[INFO] [stdout] 590 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:592:5
[INFO] [stdout]     |
[INFO] [stdout] 592 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:594:5
[INFO] [stdout]     |
[INFO] [stdout] 594 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `second` is not used by name
[INFO] [stdout]    --> src/main.rs:146:55
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                     ----                              ^^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     this formatting argument uses named argument `second` by position
[INFO] [stdout]     |
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {second:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                      ++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: named argument `third` is not used by name
[INFO] [stdout]    --> src/main.rs:146:75
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                           ----                                            ^^^^^ this named argument is referred to by position in formatting string
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           this formatting argument uses named argument `third` by position
[INFO] [stdout]     |
[INFO] [stdout] help: use the named argument by name to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 146 |     println!("{:?}, {:?}, {third:?}", first = integer_num, second = boolean_a, third = unit)
[INFO] [stdout]     |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]    --> src/main.rs:299:9
[INFO] [stdout]     |
[INFO] [stdout] 299 |         'inner: loop {
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:588:5
[INFO] [stdout]     |
[INFO] [stdout] 588 |     ;
[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/main.rs:590:5
[INFO] [stdout]     |
[INFO] [stdout] 590 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:592:5
[INFO] [stdout]     |
[INFO] [stdout] 592 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/main.rs:594:5
[INFO] [stdout]     |
[INFO] [stdout] 594 |     ;
[INFO] [stdout]     |     ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:299:9
[INFO] [stdout]     |
[INFO] [stdout] 295 |               break;
[INFO] [stdout]     |               ----- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 299 | /         'inner: loop {
[INFO] [stdout] 300 | |             println!("inner");
[INFO] [stdout] 301 | |             break 'outer;
[INFO] [stdout] 302 | |         }
[INFO] [stdout]     | |_________^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:299:9
[INFO] [stdout]     |
[INFO] [stdout] 295 |               break;
[INFO] [stdout]     |               ----- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 299 | /         'inner: loop {
[INFO] [stdout] 300 | |             println!("inner");
[INFO] [stdout] 301 | |             break 'outer;
[INFO] [stdout] 302 | |         }
[INFO] [stdout]     | |_________^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `my_string`
[INFO] [stdout]    --> src/main.rs:210:9
[INFO] [stdout]     |
[INFO] [stdout] 210 |     let my_string = String::from(my_str);
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `my_string`
[INFO] [stdout]    --> src/main.rs:210:9
[INFO] [stdout]     |
[INFO] [stdout] 210 |     let my_string = String::from(my_str);
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_my_string`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/main.rs:246:13
[INFO] [stdout]     |
[INFO] [stdout] 246 |         Err(e) => 0
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/main.rs:246:13
[INFO] [stdout]     |
[INFO] [stdout] 246 |         Err(e) => 0
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:524:25
[INFO] [stdout]     |
[INFO] [stdout] 524 |     fn work_with_string(s: String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:524:25
[INFO] [stdout]     |
[INFO] [stdout] 524 |     fn work_with_string(s: String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:531:25
[INFO] [stdout]     |
[INFO] [stdout] 531 |     fn work_with_string(s: String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:539:22
[INFO] [stdout]     |
[INFO] [stdout] 539 |     fn work_with_i32(i: i32) {}
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:531:25
[INFO] [stdout]     |
[INFO] [stdout] 531 |     fn work_with_string(s: String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:548:25
[INFO] [stdout]     |
[INFO] [stdout] 548 |     fn work_with_string(s: &String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:539:22
[INFO] [stdout]     |
[INFO] [stdout] 539 |     fn work_with_i32(i: i32) {}
[INFO] [stdout]     |                      ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `take_ownership`
[INFO] [stdout]    --> src/main.rs:552:19
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_take_ownership`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read_only_borrow`
[INFO] [stdout]    --> src/main.rs:552:43
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_read_only_borrow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mutable_borrow`
[INFO] [stdout]    --> src/main.rs:552:67
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                                                                   ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mutable_borrow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]    --> src/main.rs:548:25
[INFO] [stdout]     |
[INFO] [stdout] 548 |     fn work_with_string(s: &String) {}
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `take_ownership`
[INFO] [stdout]    --> src/main.rs:552:19
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_take_ownership`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read_only_borrow`
[INFO] [stdout]    --> src/main.rs:552:43
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                                           ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_read_only_borrow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mutable_borrow`
[INFO] [stdout]    --> src/main.rs:552:67
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |                                                                   ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mutable_borrow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `empty`
[INFO] [stdout]    --> src/main.rs:649:9
[INFO] [stdout]     |
[INFO] [stdout] 649 |     let empty = Empty;
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_empty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `null`
[INFO] [stdout]    --> src/main.rs:650:9
[INFO] [stdout]     |
[INFO] [stdout] 650 |     let null = Null;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_null`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `empty`
[INFO] [stdout]    --> src/main.rs:649:9
[INFO] [stdout]     |
[INFO] [stdout] 649 |     let empty = Empty;
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_empty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `null`
[INFO] [stdout]    --> src/main.rs:650:9
[INFO] [stdout]     |
[INFO] [stdout] 650 |     let null = Null;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_null`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:834:18
[INFO] [stdout]     |
[INFO] [stdout] 834 |             for (i, c) in self.listeners.iter() {
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:834:18
[INFO] [stdout]     |
[INFO] [stdout] 834 |             for (i, c) in self.listeners.iter() {
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:850:13
[INFO] [stdout]     |
[INFO] [stdout] 850 |         let x = 5;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]    --> src/main.rs:879:9
[INFO] [stdout]     |
[INFO] [stdout] 879 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/main.rs:850:13
[INFO] [stdout]     |
[INFO] [stdout] 850 |         let x = 5;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:960:9
[INFO] [stdout]     |
[INFO] [stdout] 960 |     let c = CustomSmartPointer {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:965:13
[INFO] [stdout]     |
[INFO] [stdout] 965 |         let d = CustomSmartPointer {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]    --> src/main.rs:879:9
[INFO] [stdout]     |
[INFO] [stdout] 879 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]     --> src/main.rs:1005:9
[INFO] [stdout]      |
[INFO] [stdout] 1005 |     let b = Cons(3, Rc::clone(&a));
[INFO] [stdout]      |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]     --> src/main.rs:1008:13
[INFO] [stdout]      |
[INFO] [stdout] 1008 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]      |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]     --> src/main.rs:1016:9
[INFO] [stdout]      |
[INFO] [stdout] 1016 |     let b1 = Cons(3, a1.clone());
[INFO] [stdout]      |         ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]     --> src/main.rs:1017:9
[INFO] [stdout]      |
[INFO] [stdout] 1017 |     let c1 = Cons(4, a1.clone());
[INFO] [stdout]      |         ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> src/main.rs:960:9
[INFO] [stdout]     |
[INFO] [stdout] 960 |     let c = CustomSmartPointer {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]    --> src/main.rs:965:13
[INFO] [stdout]     |
[INFO] [stdout] 965 |         let d = CustomSmartPointer {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Second` is never constructed
[INFO] [stdout]   --> src/main.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |     enum Day {
[INFO] [stdout]    |          --- variant in this enum
[INFO] [stdout] 77 |         First,
[INFO] [stdout] 78 |         Second,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rich` is never constructed
[INFO] [stdout]   --> src/main.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 92 | enum Status {
[INFO] [stdout]    |      ------ variant in this enum
[INFO] [stdout] 93 |     Rich,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Status` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `One` and `Three` are never constructed
[INFO] [stdout]    --> src/main.rs:99:5
[INFO] [stdout]     |
[INFO] [stdout] 98  | enum Number {
[INFO] [stdout]     |      ------ variants in this enum
[INFO] [stdout] 99  |     One = 1,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 100 |     Two = 2,
[INFO] [stdout] 101 |     Three = 3,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]     --> src/main.rs:1005:9
[INFO] [stdout]      |
[INFO] [stdout] 1005 |     let b = Cons(3, Rc::clone(&a));
[INFO] [stdout]      |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:117:14
[INFO] [stdout]     |
[INFO] [stdout] 117 |         Cons(i32, Box<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 117 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]     --> src/main.rs:1008:13
[INFO] [stdout]      |
[INFO] [stdout] 1008 |         let c = Cons(4, Rc::clone(&a));
[INFO] [stdout]      |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inference_example` is never used
[INFO] [stdout]    --> src/main.rs:198:4
[INFO] [stdout]     |
[INFO] [stdout] 198 | fn inference_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]     --> src/main.rs:1016:9
[INFO] [stdout]      |
[INFO] [stdout] 1016 |     let b1 = Cons(3, a1.clone());
[INFO] [stdout]      |         ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `type_aliasing_example` is never used
[INFO] [stdout]    --> src/main.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn type_aliasing_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]     --> src/main.rs:1017:9
[INFO] [stdout]      |
[INFO] [stdout] 1017 |     let c1 = Cons(4, a1.clone());
[INFO] [stdout]      |         ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]    --> src/main.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 214 |     struct Number {
[INFO] [stdout]     |            ------ field in this struct
[INFO] [stdout] 215 |         value: i32
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_example` is never used
[INFO] [stdout]    --> src/main.rs:360:4
[INFO] [stdout]     |
[INFO] [stdout] 360 | fn match_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:362:4
[INFO] [stdout]     |
[INFO] [stdout] 362 | fn tuple_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `enum_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:364:4
[INFO] [stdout]     |
[INFO] [stdout] 364 | fn enum_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `struct_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:391:4
[INFO] [stdout]     |
[INFO] [stdout] 391 | fn struct_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_guard` is never used
[INFO] [stdout]    --> src/main.rs:393:4
[INFO] [stdout]     |
[INFO] [stdout] 393 | fn match_guard() {}
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_binding` is never used
[INFO] [stdout]    --> src/main.rs:395:4
[INFO] [stdout]     |
[INFO] [stdout] 395 | fn match_binding() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Foo` and `Bar` are never constructed
[INFO] [stdout]    --> src/main.rs:406:9
[INFO] [stdout]     |
[INFO] [stdout] 405 |     enum Event {
[INFO] [stdout]     |          ----- variants in this enum
[INFO] [stdout] 406 |         Foo,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 407 |         Bar,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_example` is never used
[INFO] [stdout]    --> src/main.rs:432:4
[INFO] [stdout]     |
[INFO] [stdout] 432 | fn function_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_fn` is never used
[INFO] [stdout]    --> src/main.rs:552:8
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generic_example` is never used
[INFO] [stdout]    --> src/main.rs:572:4
[INFO] [stdout]     |
[INFO] [stdout] 572 | fn generic_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:584:12
[INFO] [stdout]     |
[INFO] [stdout] 584 |     struct S(A);
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:604:12
[INFO] [stdout]     |
[INFO] [stdout] 604 |     struct S;
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GenericVal` is never constructed
[INFO] [stdout]    --> src/main.rs:605:12
[INFO] [stdout]     |
[INFO] [stdout] 605 |     struct GenericVal<T>(T);
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generic_trait_example` is never used
[INFO] [stdout]    --> src/main.rs:637:4
[INFO] [stdout]     |
[INFO] [stdout] 637 | fn generic_trait_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printer` is never used
[INFO] [stdout]    --> src/main.rs:656:8
[INFO] [stdout]     |
[INFO] [stdout] 656 |     fn printer<T: Display>(t: T) { println!("{}", t); }
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:658:12
[INFO] [stdout]     |
[INFO] [stdout] 658 |     struct S<T: Display>(T);
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]    --> src/main.rs:670:8
[INFO] [stdout]     |
[INFO] [stdout] 670 |     fn area<T: HasArea>(t: &T) -> f64 { t.area() }
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]    --> src/main.rs:758:9
[INFO] [stdout]     |
[INFO] [stdout] 757 |     struct Point {
[INFO] [stdout]     |            ----- fields in this struct
[INFO] [stdout] 758 |         x: f64,
[INFO] [stdout]     |         ^
[INFO] [stdout] 759 |         y: f64,
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `mouse_y` is never read
[INFO] [stdout]    --> src/main.rs:796:36
[INFO] [stdout]     |
[INFO] [stdout] 796 |     struct OnClick { mouse_x: f32, mouse_y: f32 }
[INFO] [stdout]     |            -------                 ^^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `OnClick` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]    --> src/main.rs:859:8
[INFO] [stdout]     |
[INFO] [stdout] 859 |     fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:874:14
[INFO] [stdout]     |
[INFO] [stdout] 874 |         Cons(i32, Box<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 874 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/main.rs:951:9
[INFO] [stdout]     |
[INFO] [stdout] 950 |     struct CustomSmartPointer {
[INFO] [stdout]     |            ------------------ field in this struct
[INFO] [stdout] 951 |         data: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/main.rs:975:9
[INFO] [stdout]     |
[INFO] [stdout] 974 |     struct CustomSmartPointer {
[INFO] [stdout]     |            ------------------ field in this struct
[INFO] [stdout] 975 |         data: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:996:14
[INFO] [stdout]     |
[INFO] [stdout] 996 |         Cons(i32, Rc<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 996 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: these values and local bindings have significant drop implementation that will have a different drop order from that of Edition 2021
[INFO] [stdout]    --> src/main.rs:124:30
[INFO] [stdout]     |
[INFO] [stdout] 123 |         fn prepend(self, elem: i32) -> List {
[INFO] [stdout]     |                    ---- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] 124 |             List::Cons(elem, Box::new(self))
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2024
[INFO] [stdout]     = note: for more information, see issue #123739 <https://github.com/rust-lang/rust/issues/123739>
[INFO] [stdout]     = note: requested on the command line with `-D tail-expr-drop-order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]    --> src/main.rs:260:9
[INFO] [stdout]     |
[INFO] [stdout] 260 |         5 + 3;
[INFO] [stdout]     |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 260 |         let _ = 5 + 3;
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `str_vs_String_example` should have a snake case name
[INFO] [stdout]    --> src/main.rs:555:4
[INFO] [stdout]     |
[INFO] [stdout] 555 | fn str_vs_String_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `str_vs_string_example`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Second` is never constructed
[INFO] [stdout]   --> src/main.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |     enum Day {
[INFO] [stdout]    |          --- variant in this enum
[INFO] [stdout] 77 |         First,
[INFO] [stdout] 78 |         Second,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rich` is never constructed
[INFO] [stdout]   --> src/main.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 92 | enum Status {
[INFO] [stdout]    |      ------ variant in this enum
[INFO] [stdout] 93 |     Rich,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Status` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `One` and `Three` are never constructed
[INFO] [stdout]    --> src/main.rs:99:5
[INFO] [stdout]     |
[INFO] [stdout] 98  | enum Number {
[INFO] [stdout]     |      ------ variants in this enum
[INFO] [stdout] 99  |     One = 1,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 100 |     Two = 2,
[INFO] [stdout] 101 |     Three = 3,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:117:14
[INFO] [stdout]     |
[INFO] [stdout] 117 |         Cons(i32, Box<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 117 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inference_example` is never used
[INFO] [stdout]    --> src/main.rs:198:4
[INFO] [stdout]     |
[INFO] [stdout] 198 | fn inference_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `type_aliasing_example` is never used
[INFO] [stdout]    --> src/main.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn type_aliasing_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]    --> src/main.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 214 |     struct Number {
[INFO] [stdout]     |            ------ field in this struct
[INFO] [stdout] 215 |         value: i32
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_example` is never used
[INFO] [stdout]    --> src/main.rs:360:4
[INFO] [stdout]     |
[INFO] [stdout] 360 | fn match_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:362:4
[INFO] [stdout]     |
[INFO] [stdout] 362 | fn tuple_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `enum_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:364:4
[INFO] [stdout]     |
[INFO] [stdout] 364 | fn enum_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `struct_destruction_example` is never used
[INFO] [stdout]    --> src/main.rs:391:4
[INFO] [stdout]     |
[INFO] [stdout] 391 | fn struct_destruction_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_guard` is never used
[INFO] [stdout]    --> src/main.rs:393:4
[INFO] [stdout]     |
[INFO] [stdout] 393 | fn match_guard() {}
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_binding` is never used
[INFO] [stdout]    --> src/main.rs:395:4
[INFO] [stdout]     |
[INFO] [stdout] 395 | fn match_binding() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Foo` and `Bar` are never constructed
[INFO] [stdout]    --> src/main.rs:406:9
[INFO] [stdout]     |
[INFO] [stdout] 405 |     enum Event {
[INFO] [stdout]     |          ----- variants in this enum
[INFO] [stdout] 406 |         Foo,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 407 |         Bar,
[INFO] [stdout]     |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_example` is never used
[INFO] [stdout]    --> src/main.rs:432:4
[INFO] [stdout]     |
[INFO] [stdout] 432 | fn function_example() {}
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_fn` is never used
[INFO] [stdout]    --> src/main.rs:552:8
[INFO] [stdout]     |
[INFO] [stdout] 552 |     fn example_fn(take_ownership: String, read_only_borrow: &str, mutable_borrow: &mut str) {}
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generic_example` is never used
[INFO] [stdout]    --> src/main.rs:572:4
[INFO] [stdout]     |
[INFO] [stdout] 572 | fn generic_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:584:12
[INFO] [stdout]     |
[INFO] [stdout] 584 |     struct S(A);
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:604:12
[INFO] [stdout]     |
[INFO] [stdout] 604 |     struct S;
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `GenericVal` is never constructed
[INFO] [stdout]    --> src/main.rs:605:12
[INFO] [stdout]     |
[INFO] [stdout] 605 |     struct GenericVal<T>(T);
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generic_trait_example` is never used
[INFO] [stdout]    --> src/main.rs:637:4
[INFO] [stdout]     |
[INFO] [stdout] 637 | fn generic_trait_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printer` is never used
[INFO] [stdout]    --> src/main.rs:656:8
[INFO] [stdout]     |
[INFO] [stdout] 656 |     fn printer<T: Display>(t: T) { println!("{}", t); }
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]    --> src/main.rs:658:12
[INFO] [stdout]     |
[INFO] [stdout] 658 |     struct S<T: Display>(T);
[INFO] [stdout]     |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `area` is never used
[INFO] [stdout]    --> src/main.rs:670:8
[INFO] [stdout]     |
[INFO] [stdout] 670 |     fn area<T: HasArea>(t: &T) -> f64 { t.area() }
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]    --> src/main.rs:758:9
[INFO] [stdout]     |
[INFO] [stdout] 757 |     struct Point {
[INFO] [stdout]     |            ----- fields in this struct
[INFO] [stdout] 758 |         x: f64,
[INFO] [stdout]     |         ^
[INFO] [stdout] 759 |         y: f64,
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `mouse_y` is never read
[INFO] [stdout]    --> src/main.rs:796:36
[INFO] [stdout]     |
[INFO] [stdout] 796 |     struct OnClick { mouse_x: f32, mouse_y: f32 }
[INFO] [stdout]     |            -------                 ^^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `OnClick` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]    --> src/main.rs:859:8
[INFO] [stdout]     |
[INFO] [stdout] 859 |     fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:874:14
[INFO] [stdout]     |
[INFO] [stdout] 874 |         Cons(i32, Box<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 874 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/main.rs:951:9
[INFO] [stdout]     |
[INFO] [stdout] 950 |     struct CustomSmartPointer {
[INFO] [stdout]     |            ------------------ field in this struct
[INFO] [stdout] 951 |         data: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/main.rs:975:9
[INFO] [stdout]     |
[INFO] [stdout] 974 |     struct CustomSmartPointer {
[INFO] [stdout]     |            ------------------ field in this struct
[INFO] [stdout] 975 |         data: String,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/main.rs:996:14
[INFO] [stdout]     |
[INFO] [stdout] 996 |         Cons(i32, Rc<List>),
[INFO] [stdout]     |         ---- ^^^  ^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 996 |         Cons((), ()),
[INFO] [stdout]     |              ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: these values and local bindings have significant drop implementation that will have a different drop order from that of Edition 2021
[INFO] [stdout]    --> src/main.rs:124:30
[INFO] [stdout]     |
[INFO] [stdout] 123 |         fn prepend(self, elem: i32) -> List {
[INFO] [stdout]     |                    ---- these values have significant drop implementation and will observe changes in drop order under Edition 2024
[INFO] [stdout] 124 |             List::Cons(elem, Box::new(self))
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2024
[INFO] [stdout]     = note: for more information, see issue #123739 <https://github.com/rust-lang/rust/issues/123739>
[INFO] [stdout]     = note: requested on the command line with `-D tail-expr-drop-order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]    --> src/main.rs:260:9
[INFO] [stdout]     |
[INFO] [stdout] 260 |         5 + 3;
[INFO] [stdout]     |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 260 |         let _ = 5 + 3;
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `str_vs_String_example` should have a snake case name
[INFO] [stdout]    --> src/main.rs:555:4
[INFO] [stdout]     |
[INFO] [stdout] 555 | fn str_vs_String_example() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `str_vs_string_example`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 62 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 62 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `TheJoyOfRust` (bin "TheJoyOfRust" test) due to 2 previous errors; 62 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `TheJoyOfRust` (bin "TheJoyOfRust") due to 2 previous errors; 62 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "3e78c12f351d820f5eb9a0e4c50dccc9757b44d3ca928849cf995bced440246c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e78c12f351d820f5eb9a0e4c50dccc9757b44d3ca928849cf995bced440246c", kill_on_drop: false }`
[INFO] [stdout] 3e78c12f351d820f5eb9a0e4c50dccc9757b44d3ca928849cf995bced440246c