[INFO] cloning repository https://github.com/estheroche/rust-program
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/estheroche/rust-program" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Festheroche%2Frust-program", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Festheroche%2Frust-program'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e3619e7141d7fa2f264f7616396ca37334b607c4
[INFO] checking estheroche/rust-program against master#c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3 for pr-141352
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Festheroche%2Frust-program" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/estheroche/rust-program on toolchain c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/estheroche/rust-program
[INFO] finished tweaking git repo https://github.com/estheroche/rust-program
[INFO] tweaked toml for git repo https://github.com/estheroche/rust-program written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/estheroche/rust-program 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" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cd0f3e52a51108e6214bf51891d6fac1f257d991362926aa1ba4100bfd735ed1
[INFO] running `Command { std: "docker" "start" "-a" "cd0f3e52a51108e6214bf51891d6fac1f257d991362926aa1ba4100bfd735ed1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cd0f3e52a51108e6214bf51891d6fac1f257d991362926aa1ba4100bfd735ed1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd0f3e52a51108e6214bf51891d6fac1f257d991362926aa1ba4100bfd735ed1", kill_on_drop: false }`
[INFO] [stdout] cd0f3e52a51108e6214bf51891d6fac1f257d991362926aa1ba4100bfd735ed1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e32824867f32611cd511870bfd5e738c177d072e82f125a31b9c2d68ef067a0c
[INFO] running `Command { std: "docker" "start" "-a" "e32824867f32611cd511870bfd5e738c177d072e82f125a31b9c2d68ef067a0c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking guess_game v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]   --> src/data_types/dt.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let number = get_number();
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/data_types/dt.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut arr = [1, 2, 3, 4, 5];
[INFO] [stdout]    |         ----^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/ownership/ownership.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let s = "hello";
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dog`
[INFO] [stdout]  --> src/ownership/ownership.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let dog = Animal {};
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_dog`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/ownership/ownership.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let y = x.clone();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `age`
[INFO] [stdout]  --> src/struct_examples/struct_examples.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let (age, name, game_id) = tup;
[INFO] [stdout]   |          ^^^ help: if this is intentional, prefix it with an underscore: `_age`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]  --> src/struct_examples/struct_examples.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let (age, name, game_id) = tup;
[INFO] [stdout]   |               ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `game_id`
[INFO] [stdout]  --> src/struct_examples/struct_examples.rs:4:21
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let (age, name, game_id) = tup;
[INFO] [stdout]   |                     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_game_id`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dog1`
[INFO] [stdout]   --> src/struct_examples/struct_examples.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let dog1 = Dog;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_dog1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dog3`
[INFO] [stdout]   --> src/struct_examples/struct_examples.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let dog3 = dog2.skin;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_dog3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_equal`
[INFO] [stdout]   --> src/struct_examples/struct_examples.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let is_equal = dog == cat;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_equal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/struct_examples/struct_examples.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let num = 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `vec2`
[INFO] [stdout]  --> src/collections/collection_examples.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let vec2: Vec<&str> = Vec::new();
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_vec2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `enum_examples::enum_examples::Animal` is more private than the item `create_animal`
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:79:1
[INFO] [stdout]    |
[INFO] [stdout] 79 | pub fn create_animal(animal_type: Animal) -> Option<Animal> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function `create_animal` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `enum_examples::enum_examples::Animal` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:63:1
[INFO] [stdout]    |
[INFO] [stdout] 63 | enum Animal {
[INFO] [stdout]    | ^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/ball.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {}
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn first_word(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Dog` is never constructed
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct Dog {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `DogBreed` is never used
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum DogBreed {
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `bark` is never used
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 43 | impl Dog {
[INFO] [stdout]    | -------- method in this implementation
[INFO] [stdout] 44 |     pub fn bark(&self) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Fish`, `Frog`, and `Goat` are never constructed
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | enum Animal {
[INFO] [stdout]    |      ------ variants in this enum
[INFO] [stdout] ...
[INFO] [stdout] 66 |     Fish(String),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 67 |     Frog(String),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 68 |     Goat(String)
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Animal` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddrV4` is never constructed
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 | struct IpAddrV4 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/struct_examples/struct_examples.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     drop(skin);
[INFO] [stdout]    |     ^^^^^----^
[INFO] [stdout]    |          |
[INFO] [stdout]    |          argument has type `&str`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 20 -     drop(skin);
[INFO] [stdout] 20 +     let _ = skin;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `core::slice::<impl [T]>::first` that must be used
[INFO] [stdout]   --> src/collections/collection_examples.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     vector.first();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[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] 16 |     let _ = vector.first();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]   --> src/data_types/dt.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let number = get_number();
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/data_types/dt.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut arr = [1, 2, 3, 4, 5];
[INFO] [stdout]    |         ----^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/ownership/ownership.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let s = "hello";
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dog`
[INFO] [stdout]  --> src/ownership/ownership.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let dog = Animal {};
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_dog`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/ownership/ownership.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let y = x.clone();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `age`
[INFO] [stdout]  --> src/struct_examples/struct_examples.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let (age, name, game_id) = tup;
[INFO] [stdout]   |          ^^^ help: if this is intentional, prefix it with an underscore: `_age`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]  --> src/struct_examples/struct_examples.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let (age, name, game_id) = tup;
[INFO] [stdout]   |               ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `game_id`
[INFO] [stdout]  --> src/struct_examples/struct_examples.rs:4:21
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let (age, name, game_id) = tup;
[INFO] [stdout]   |                     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_game_id`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dog1`
[INFO] [stdout]   --> src/struct_examples/struct_examples.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let dog1 = Dog;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_dog1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dog3`
[INFO] [stdout]   --> src/struct_examples/struct_examples.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let dog3 = dog2.skin;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_dog3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_equal`
[INFO] [stdout]   --> src/struct_examples/struct_examples.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let is_equal = dog == cat;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_equal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/struct_examples/struct_examples.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let num = 5;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `vec2`
[INFO] [stdout]  --> src/collections/collection_examples.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let vec2: Vec<&str> = Vec::new();
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_vec2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `enum_examples::enum_examples::Animal` is more private than the item `create_animal`
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:79:1
[INFO] [stdout]    |
[INFO] [stdout] 79 | pub fn create_animal(animal_type: Animal) -> Option<Animal> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function `create_animal` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but type `enum_examples::enum_examples::Animal` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:63:1
[INFO] [stdout]    |
[INFO] [stdout] 63 | enum Animal {
[INFO] [stdout]    | ^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/ball.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {}
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/ownership/ownership.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn first_word(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Dog` is never constructed
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct Dog {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `DogBreed` is never used
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum DogBreed {
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `bark` is never used
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 43 | impl Dog {
[INFO] [stdout]    | -------- method in this implementation
[INFO] [stdout] 44 |     pub fn bark(&self) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Fish`, `Frog`, and `Goat` are never constructed
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | enum Animal {
[INFO] [stdout]    |      ------ variants in this enum
[INFO] [stdout] ...
[INFO] [stdout] 66 |     Fish(String),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 67 |     Frog(String),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 68 |     Goat(String)
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Animal` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddrV4` is never constructed
[INFO] [stdout]   --> src/enum_examples/enum_examples.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 | struct IpAddrV4 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/struct_examples/struct_examples.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     drop(skin);
[INFO] [stdout]    |     ^^^^^----^
[INFO] [stdout]    |          |
[INFO] [stdout]    |          argument has type `&str`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 20 -     drop(skin);
[INFO] [stdout] 20 +     let _ = skin;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `core::slice::<impl [T]>::first` that must be used
[INFO] [stdout]   --> src/collections/collection_examples.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     vector.first();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[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] 16 |     let _ = vector.first();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::data_types::dt`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use guess_game::data_types::dt;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::guess_game::gg_main`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use guess_game::guess_game::gg_main;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::ownership::ownership`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use guess_game::ownership::ownership;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::struct_examples::struct_examples`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use guess_game::struct_examples::struct_examples;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::variables::var`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use guess_game::variables::var;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::enum_examples::enum_examples`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use guess_game::enum_examples::enum_examples;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::data_types::dt`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use guess_game::data_types::dt;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::guess_game::gg_main`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use guess_game::guess_game::gg_main;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::ownership::ownership`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use guess_game::ownership::ownership;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::struct_examples::struct_examples`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use guess_game::struct_examples::struct_examples;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::variables::var`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use guess_game::variables::var;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `guess_game::enum_examples::enum_examples`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use guess_game::enum_examples::enum_examples;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.99s
[INFO] running `Command { std: "docker" "inspect" "e32824867f32611cd511870bfd5e738c177d072e82f125a31b9c2d68ef067a0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e32824867f32611cd511870bfd5e738c177d072e82f125a31b9c2d68ef067a0c", kill_on_drop: false }`
[INFO] [stdout] e32824867f32611cd511870bfd5e738c177d072e82f125a31b9c2d68ef067a0c