[INFO] cloning repository https://github.com/Louis-XWB/rust_exercise
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Louis-XWB/rust_exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLouis-XWB%2Frust_exercise", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLouis-XWB%2Frust_exercise'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 60c7c98309d4bdf6bf89f4320beff78bc9cf504f
[INFO] checking Louis-XWB/rust_exercise against master#7c4ac0603e9ee5295bc802c90575391288a69a8a for pr-124728
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLouis-XWB%2Frust_exercise" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Louis-XWB/rust_exercise on toolchain 7c4ac0603e9ee5295bc802c90575391288a69a8a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7c4ac0603e9ee5295bc802c90575391288a69a8a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Louis-XWB/rust_exercise
[INFO] finished tweaking git repo https://github.com/Louis-XWB/rust_exercise
[INFO] tweaked toml for git repo https://github.com/Louis-XWB/rust_exercise written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Louis-XWB/rust_exercise 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" "+7c4ac0603e9ee5295bc802c90575391288a69a8a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking Louis-XWB/rust_exercise against try#98ebbae35138252af77610c20ea5a5e8bf68d639 for pr-124728
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLouis-XWB%2Frust_exercise" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Louis-XWB/rust_exercise on toolchain 98ebbae35138252af77610c20ea5a5e8bf68d639
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+98ebbae35138252af77610c20ea5a5e8bf68d639" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Louis-XWB/rust_exercise
[INFO] finished tweaking git repo https://github.com/Louis-XWB/rust_exercise
[INFO] tweaked toml for git repo https://github.com/Louis-XWB/rust_exercise written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Louis-XWB/rust_exercise 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" "+98ebbae35138252af77610c20ea5a5e8bf68d639" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking Louis-XWB/rust_exercise against try#98ebbae35138252af77610c20ea5a5e8bf68d639 for pr-124728
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLouis-XWB%2Frust_exercise" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Louis-XWB/rust_exercise on toolchain 98ebbae35138252af77610c20ea5a5e8bf68d639
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+98ebbae35138252af77610c20ea5a5e8bf68d639" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Louis-XWB/rust_exercise
[INFO] finished tweaking git repo https://github.com/Louis-XWB/rust_exercise
[INFO] tweaked toml for git repo https://github.com/Louis-XWB/rust_exercise written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Louis-XWB/rust_exercise 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" "+98ebbae35138252af77610c20ea5a5e8bf68d639" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+98ebbae35138252af77610c20ea5a5e8bf68d639" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a1d85a6669a3f9384080d70e0672aa8b6a810a3db9453c987824332f16121e67
[INFO] running `Command { std: "docker" "start" "-a" "a1d85a6669a3f9384080d70e0672aa8b6a810a3db9453c987824332f16121e67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a1d85a6669a3f9384080d70e0672aa8b6a810a3db9453c987824332f16121e67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1d85a6669a3f9384080d70e0672aa8b6a810a3db9453c987824332f16121e67", kill_on_drop: false }`
[INFO] [stdout] a1d85a6669a3f9384080d70e0672aa8b6a810a3db9453c987824332f16121e67
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "-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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+98ebbae35138252af77610c20ea5a5e8bf68d639" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 81dd42d2d8e4ad25c9d8c22857caf6dd97971998d3d20cc7c98607771dbb0a10
[INFO] running `Command { std: "docker" "start" "-a" "81dd42d2d8e4ad25c9d8c22857caf6dd97971998d3d20cc7c98607771dbb0a10", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_exercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::front_of_house::hosting`
[INFO] [stdout]   --> src/lib.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | use crate::front_of_house::hosting;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::front_of_house::hosting`
[INFO] [stdout]   --> src/lib.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | use crate::front_of_house::hosting;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order1`
[INFO] [stdout]   --> src/lib.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let order1 = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]   --> src/lib.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let order2 = back_of_house::Appetizer::Salad;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_order` is never used
[INFO] [stdout]  --> src/front_of_house.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 |   fn take_order() {}
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]   --> src/front_of_house.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 |   fn serve_order() {}
[INFO] [stdout]    |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payment` is never used
[INFO] [stdout]   --> src/front_of_house.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 |   fn take_payment() {}
[INFO] [stdout]    |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `seasonal_fruit` is never read
[INFO] [stdout]   --> src/lib.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub struct Breakfast {
[INFO] [stdout]    |                --------- field in this struct
[INFO] [stdout] 16 |         pub toast: String,
[INFO] [stdout] 17 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eat_at_restaurant` is never used
[INFO] [stdout]   --> src/lib.rs:53:10
[INFO] [stdout]    |
[INFO] [stdout] 53 |   pub fn eat_at_restaurant() {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order1`
[INFO] [stdout]   --> src/lib.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let order1 = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]   --> src/lib.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let order2 = back_of_house::Appetizer::Salad;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_order` is never used
[INFO] [stdout]  --> src/front_of_house.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 |   fn take_order() {}
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `serve_order` is never used
[INFO] [stdout]   --> src/front_of_house.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 |   fn serve_order() {}
[INFO] [stdout]    |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `take_payment` is never used
[INFO] [stdout]   --> src/front_of_house.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 |   fn take_payment() {}
[INFO] [stdout]    |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `seasonal_fruit` is never read
[INFO] [stdout]   --> src/lib.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub struct Breakfast {
[INFO] [stdout]    |                --------- field in this struct
[INFO] [stdout] 16 |         pub toast: String,
[INFO] [stdout] 17 |         seasonal_fruit: String,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eat_at_restaurant` is never used
[INFO] [stdout]   --> src/lib.rs:53:10
[INFO] [stdout]    |
[INFO] [stdout] 53 |   pub fn eat_at_restaurant() {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> src/syntax/function.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 |     if (age < 18) {
[INFO] [stdout]    |        ^        ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 65 -     if (age < 18) {
[INFO] [stdout] 65 +     if age < 18 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> src/syntax/function.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 |     if (age < 18) {
[INFO] [stdout]    |        ^        ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 65 -     if (age < 18) {
[INFO] [stdout] 65 +     if age < 18 {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/syntax/scalar.rs:17:13
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut y = 5; //mutable variable binding
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let x: i8 = 5; //signed 8-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let x: u8 = 5; //unsigned 8-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let x: i16 = 5; //signed 16-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let x: u16 = 5; //unsigned 16-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let x: i32 = 5; //signed 32-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let x: u32 = 5; //unsigned 32-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let x: i64 = 5; //signed 64-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let x: u64 = 5; //unsigned 64-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let x: isize = 5; //signed pointer-sized integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let x: usize = 5; //unsigned pointer-sized integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let x: f32 = 5.0; //32-bit floating-point number
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let x: f64 = 5.0; //64-bit floating-point number
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/syntax/scalar.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let sum = 5 + 10; //addition
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difference`
[INFO] [stdout]   --> src/syntax/scalar.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let difference = 95.5 - 4.3; //subtraction
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difference`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `product`
[INFO] [stdout]   --> src/syntax/scalar.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let product = 4 * 30; //multiplication
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_product`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `quotient`
[INFO] [stdout]   --> src/syntax/scalar.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let quotient = 56.7 / 32.2; //division
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotient`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `remainder`
[INFO] [stdout]   --> src/syntax/scalar.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let remainder = 43 % 5; //remainder
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_remainder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/syntax/scalar.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let t = true;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/syntax/scalar.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let f: bool = false; //with explicit type annotation
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/syntax/scalar.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let c = 'z';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/syntax/scalar.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let z = 'ℤ';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hex`
[INFO] [stdout]   --> src/syntax/scalar.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let hex = 0xff; // Hexadecimal format
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_hex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `octal`
[INFO] [stdout]   --> src/syntax/scalar.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let octal = 0o77; // Octal format
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_octal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `binary`
[INFO] [stdout]   --> src/syntax/scalar.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let binary = 0b1111_0000; // Binary format
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_binary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `byte`
[INFO] [stdout]   --> src/syntax/scalar.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let byte = b'A'; // Byte format (u8 only)
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/syntax/scalar.rs:17:13
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut y = 5; //mutable variable binding
[INFO] [stdout]    |             ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let x: i8 = 5; //signed 8-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let x: u8 = 5; //unsigned 8-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let x: i16 = 5; //signed 16-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let x: u16 = 5; //unsigned 16-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let x: i32 = 5; //signed 32-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let x: u32 = 5; //unsigned 32-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let x: i64 = 5; //signed 64-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let x: u64 = 5; //unsigned 64-bit integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let x: isize = 5; //signed pointer-sized integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let x: usize = 5; //unsigned pointer-sized integer
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let x: f32 = 5.0; //32-bit floating-point number
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/syntax/scalar.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let x: f64 = 5.0; //64-bit floating-point number
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/syntax/scalar.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let sum = 5 + 10; //addition
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difference`
[INFO] [stdout]   --> src/syntax/scalar.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let difference = 95.5 - 4.3; //subtraction
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difference`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `product`
[INFO] [stdout]   --> src/syntax/scalar.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let product = 4 * 30; //multiplication
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_product`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `quotient`
[INFO] [stdout]   --> src/syntax/scalar.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let quotient = 56.7 / 32.2; //division
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotient`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `remainder`
[INFO] [stdout]   --> src/syntax/scalar.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let remainder = 43 % 5; //remainder
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_remainder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/syntax/scalar.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let t = true;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/syntax/scalar.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let f: bool = false; //with explicit type annotation
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/syntax/scalar.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let c = 'z';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/syntax/scalar.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let z = 'ℤ';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hex`
[INFO] [stdout]   --> src/syntax/scalar.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let hex = 0xff; // Hexadecimal format
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_hex`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `octal`
[INFO] [stdout]   --> src/syntax/scalar.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let octal = 0o77; // Octal format
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_octal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `binary`
[INFO] [stdout]   --> src/syntax/scalar.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let binary = 0b1111_0000; // Binary format
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_binary`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `byte`
[INFO] [stdout]   --> src/syntax/scalar.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let byte = b'A'; // Byte format (u8 only)
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/syntax/string.rs:2:13
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut s = String::new();
[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/syntax/string.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let s = data.to_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/syntax/string.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let s = "initial contents".to_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/syntax/string.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let s = String::from("initial contents");
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/syntax/string.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut s = String::new();
[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: `v4`
[INFO] [stdout]   --> src/syntax/vector.rs:25:7
[INFO] [stdout]    |
[INFO] [stdout] 25 |   let v4 = vec![1, 2, 3, 4, 5];
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_v4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/syntax/vector.rs:53:7
[INFO] [stdout]    |
[INFO] [stdout] 53 |   let row = vec![
[INFO] [stdout]    |       ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v8`
[INFO] [stdout]   --> src/syntax/vector.rs:60:11
[INFO] [stdout]    |
[INFO] [stdout] 60 |       let v8 = vec![1, 2, 3, 4];
[INFO] [stdout]    |           ^^ help: if this is intentional, prefix it with an underscore: `_v8`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/syntax/string.rs:2:13
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut s = String::new();
[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/syntax/string.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let s = data.to_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/syntax/string.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let s = "initial contents".to_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/syntax/string.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let s = String::from("initial contents");
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/syntax/vector.rs:31:7
[INFO] [stdout]    |
[INFO] [stdout] 31 |   let mut v5 = vec![1, 2, 3, 4, 5];
[INFO] [stdout]    |       ----^^
[INFO] [stdout]    |       |
[INFO] [stdout]    |       help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/syntax/string.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut s = String::new();
[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: `v4`
[INFO] [stdout]   --> src/syntax/vector.rs:25:7
[INFO] [stdout]    |
[INFO] [stdout] 25 |   let v4 = vec![1, 2, 3, 4, 5];
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_v4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `adjustment`
[INFO] [stdout]   --> src/syntax/array.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let adjustment  = if temperature<15 {10}else{20};
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_adjustment`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/syntax/vector.rs:53:7
[INFO] [stdout]    |
[INFO] [stdout] 53 |   let row = vec![
[INFO] [stdout]    |       ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v8`
[INFO] [stdout]   --> src/syntax/vector.rs:60:11
[INFO] [stdout]    |
[INFO] [stdout] 60 |       let v8 = vec![1, 2, 3, 4];
[INFO] [stdout]    |           ^^ help: if this is intentional, prefix it with an underscore: `_v8`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ref_x`
[INFO] [stdout]   --> src/syntax/references_borrowing.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let ref_x: &i32;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_ref_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `xx`
[INFO] [stdout]   --> src/syntax/references_borrowing.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let xx: i32 = 10;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_xx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `active`
[INFO] [stdout]   --> src/syntax/structs.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let active = user1.active;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_active`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `username`
[INFO] [stdout]   --> src/syntax/structs.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let username = user1.username;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_username`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `email`
[INFO] [stdout]   --> src/syntax/structs.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let email = user1.email;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_email`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sign_in_count`
[INFO] [stdout]   --> src/syntax/structs.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let sign_in_count = user1.sign_in_count;
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sign_in_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user3`
[INFO] [stdout]   --> src/syntax/structs.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let user3 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/syntax/vector.rs:31:7
[INFO] [stdout]    |
[INFO] [stdout] 31 |   let mut v5 = vec![1, 2, 3, 4, 5];
[INFO] [stdout]    |       ----^^
[INFO] [stdout]    |       |
[INFO] [stdout]    |       help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `adjustment`
[INFO] [stdout]   --> src/syntax/array.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let adjustment  = if temperature<15 {10}else{20};
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_adjustment`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/syntax/enums.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let home = IpAddr {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/syntax/enums.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let loopback = IpAddr {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home2`
[INFO] [stdout]   --> src/syntax/enums.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let home2 = IpAddr2::V4(String::from("127.0.0.1"));
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_home2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback2`
[INFO] [stdout]   --> src/syntax/enums.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let loopback2 = IpAddr2::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home3`
[INFO] [stdout]   --> src/syntax/enums.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     let home3 = IpAddr3::V4(127, 0, 0, 1);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_home3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback3`
[INFO] [stdout]   --> src/syntax/enums.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let loopback3 = IpAddr3::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ref_x`
[INFO] [stdout]   --> src/syntax/references_borrowing.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let ref_x: &i32;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_ref_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `xx`
[INFO] [stdout]   --> src/syntax/references_borrowing.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let xx: i32 = 10;
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_xx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lhs`
[INFO] [stdout]   --> src/syntax/function.rs:16:20
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn is_divisible_by(lhs: u32, rhs: u32) -> bool {
[INFO] [stdout]    |                    ^^^ help: if this is intentional, prefix it with an underscore: `_lhs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `active`
[INFO] [stdout]   --> src/syntax/structs.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let active = user1.active;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_active`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `username`
[INFO] [stdout]   --> src/syntax/structs.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let username = user1.username;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_username`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `email`
[INFO] [stdout]   --> src/syntax/structs.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let email = user1.email;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_email`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sign_in_count`
[INFO] [stdout]   --> src/syntax/structs.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let sign_in_count = user1.sign_in_count;
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sign_in_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user3`
[INFO] [stdout]   --> src/syntax/structs.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let user3 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/syntax/function.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     for i in 1..=n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/syntax/enums.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let home = IpAddr {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/syntax/enums.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let loopback = IpAddr {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home2`
[INFO] [stdout]   --> src/syntax/enums.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let home2 = IpAddr2::V4(String::from("127.0.0.1"));
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_home2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback2`
[INFO] [stdout]   --> src/syntax/enums.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let loopback2 = IpAddr2::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home3`
[INFO] [stdout]   --> src/syntax/enums.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     let home3 = IpAddr3::V4(127, 0, 0, 1);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_home3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback3`
[INFO] [stdout]   --> src/syntax/enums.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let loopback3 = IpAddr3::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/vector.rs:48:11
[INFO] [stdout]    |
[INFO] [stdout] 48 |       Int(i32),
[INFO] [stdout]    |       --- ^^^
[INFO] [stdout]    |       |
[INFO] [stdout]    |       field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 48 |       Int(()),
[INFO] [stdout]    |           ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/vector.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |       Float(f64),
[INFO] [stdout]    |       ----- ^^^
[INFO] [stdout]    |       |
[INFO] [stdout]    |       field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 49 |       Float(()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/vector.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 50 |       Text(String),
[INFO] [stdout]    |       ---- ^^^^^^
[INFO] [stdout]    |       |
[INFO] [stdout]    |       field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 50 |       Text(()),
[INFO] [stdout]    |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> src/syntax/enums.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     struct IpAddr {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 21 |         kind: IpAddrKind,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 22 |         address: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/enums.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |         V4(String),
[INFO] [stdout]    |         -- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 36 |         V4(()),
[INFO] [stdout]    |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/enums.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |         V6(String),
[INFO] [stdout]    |         -- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 37 |         V6(()),
[INFO] [stdout]    |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> src/syntax/enums.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |         V4(u8, u8, u8, u8),
[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] 44 |         V4((), (), (), ()),
[INFO] [stdout]    |            ~~  ~~  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/enums.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |         V6(String),
[INFO] [stdout]    |         -- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 45 |         V6(()),
[INFO] [stdout]    |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Ipv4Addr` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 51 |     struct Ipv4Addr {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Ipv6Addr` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |     struct Ipv6Addr {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddr4` is never used
[INFO] [stdout]   --> src/syntax/enums.rs:59:10
[INFO] [stdout]    |
[INFO] [stdout] 59 |     enum IpAddr4 {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/syntax/enums.rs:67:16
[INFO] [stdout]    |
[INFO] [stdout] 67 |         Move { x: i32, y: i32 },
[INFO] [stdout]    |         ----   ^       ^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/enums.rs:68:15
[INFO] [stdout]    |
[INFO] [stdout] 68 |         Write(String),
[INFO] [stdout]    |         ----- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 68 |         Write(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit` and `ChangeColor` are never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     enum Message {
[INFO] [stdout]    |          ------- variants in this enum
[INFO] [stdout] 66 |         Quit,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 69 |         ChangeColor(i32, i32, i32),
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` 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 `QuitMessage` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:84:12
[INFO] [stdout]    |
[INFO] [stdout] 84 |     struct QuitMessage; // unit struct
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lhs`
[INFO] [stdout]   --> src/syntax/function.rs:16:20
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn is_divisible_by(lhs: u32, rhs: u32) -> bool {
[INFO] [stdout]    |                    ^^^ help: if this is intentional, prefix it with an underscore: `_lhs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MoveMessage` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:85:12
[INFO] [stdout]    |
[INFO] [stdout] 85 |     struct MoveMessage {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WriteMessage` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:89:12
[INFO] [stdout]    |
[INFO] [stdout] 89 |     struct WriteMessage(String); // tuple struct
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ChangeColorMessage` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:90:12
[INFO] [stdout]    |
[INFO] [stdout] 90 |     struct ChangeColorMessage(i32, i32, i32); // tuple struct
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Nickel`, `Dime`, and `Quarter` are never constructed
[INFO] [stdout]    --> src/syntax/enums.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     enum Coin {
[INFO] [stdout]     |          ---- variants in this enum
[INFO] [stdout] 109 |         Penny,
[INFO] [stdout] 110 |         Nickel,
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout] 111 |         Dime,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 112 |         Quarter,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/syntax/function.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     for i in 1..=n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Alabama` is never constructed
[INFO] [stdout]    --> src/syntax/enums.rs:132:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |     enum UsState {
[INFO] [stdout]     |          ------- variant in this enum
[INFO] [stdout] 132 |         Alabama,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `UsState` 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 `Penny`, `Nickel`, and `Dime` are never constructed
[INFO] [stdout]    --> src/syntax/enums.rs:137:9
[INFO] [stdout]     |
[INFO] [stdout] 136 |     enum Coin2 {
[INFO] [stdout]     |          ----- variants in this enum
[INFO] [stdout] 137 |         Penny,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 138 |         Nickel,
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout] 139 |         Dime,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_divisible_by` is never used
[INFO] [stdout]   --> src/syntax/function.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn is_divisible_by(lhs: u32, rhs: u32) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `customWidth` should have a snake case name
[INFO] [stdout]   --> src/syntax/structs.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let customWidth = 10;
[INFO] [stdout]    |         ^^^^^^^^^^^ help: convert the identifier to snake case: `custom_width`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `isRightWidth` should have a snake case name
[INFO] [stdout]   --> src/syntax/structs.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let isRightWidth = Rectangle::isRightWidth(10);
[INFO] [stdout]    |         ^^^^^^^^^^^^ help: convert the identifier to snake case: `is_right_width`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `isRightWidth` should have a snake case name
[INFO] [stdout]   --> src/syntax/structs.rs:92:8
[INFO] [stdout]    |
[INFO] [stdout] 92 |     fn isRightWidth(width: u32) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `is_right_width`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `ipV4` should have a snake case name
[INFO] [stdout]  --> src/syntax/enums.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let ipV4 = IpAddrKind::V4;
[INFO] [stdout]   |         ^^^^ help: convert the identifier to snake case: `ip_v4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `ipV6` should have a snake case name
[INFO] [stdout]  --> src/syntax/enums.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let ipV6 = IpAddrKind::V6;
[INFO] [stdout]   |         ^^^^ help: convert the identifier to snake case: `ip_v6`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/vector.rs:48:11
[INFO] [stdout]    |
[INFO] [stdout] 48 |       Int(i32),
[INFO] [stdout]    |       --- ^^^
[INFO] [stdout]    |       |
[INFO] [stdout]    |       field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 48 |       Int(()),
[INFO] [stdout]    |           ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/vector.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |       Float(f64),
[INFO] [stdout]    |       ----- ^^^
[INFO] [stdout]    |       |
[INFO] [stdout]    |       field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 49 |       Float(()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/vector.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 50 |       Text(String),
[INFO] [stdout]    |       ---- ^^^^^^
[INFO] [stdout]    |       |
[INFO] [stdout]    |       field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 50 |       Text(()),
[INFO] [stdout]    |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `kind` and `address` are never read
[INFO] [stdout]   --> src/syntax/enums.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     struct IpAddr {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 21 |         kind: IpAddrKind,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 22 |         address: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/enums.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |         V4(String),
[INFO] [stdout]    |         -- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 36 |         V4(()),
[INFO] [stdout]    |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/enums.rs:37:12
[INFO] [stdout]    |
[INFO] [stdout] 37 |         V6(String),
[INFO] [stdout]    |         -- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 37 |         V6(()),
[INFO] [stdout]    |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]   --> src/syntax/enums.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |         V4(u8, u8, u8, u8),
[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] 44 |         V4((), (), (), ()),
[INFO] [stdout]    |            ~~  ~~  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/enums.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |         V6(String),
[INFO] [stdout]    |         -- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 45 |         V6(()),
[INFO] [stdout]    |            ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Ipv4Addr` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 51 |     struct Ipv4Addr {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Ipv6Addr` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |     struct Ipv6Addr {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddr4` is never used
[INFO] [stdout]   --> src/syntax/enums.rs:59:10
[INFO] [stdout]    |
[INFO] [stdout] 59 |     enum IpAddr4 {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/syntax/enums.rs:67:16
[INFO] [stdout]    |
[INFO] [stdout] 67 |         Move { x: i32, y: i32 },
[INFO] [stdout]    |         ----   ^       ^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/syntax/enums.rs:68:15
[INFO] [stdout]    |
[INFO] [stdout] 68 |         Write(String),
[INFO] [stdout]    |         ----- ^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 68 |         Write(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit` and `ChangeColor` are never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     enum Message {
[INFO] [stdout]    |          ------- variants in this enum
[INFO] [stdout] 66 |         Quit,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 69 |         ChangeColor(i32, i32, i32),
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Message` 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 `QuitMessage` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:84:12
[INFO] [stdout]    |
[INFO] [stdout] 84 |     struct QuitMessage; // unit struct
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MoveMessage` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:85:12
[INFO] [stdout]    |
[INFO] [stdout] 85 |     struct MoveMessage {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WriteMessage` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:89:12
[INFO] [stdout]    |
[INFO] [stdout] 89 |     struct WriteMessage(String); // tuple struct
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ChangeColorMessage` is never constructed
[INFO] [stdout]   --> src/syntax/enums.rs:90:12
[INFO] [stdout]    |
[INFO] [stdout] 90 |     struct ChangeColorMessage(i32, i32, i32); // tuple struct
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Nickel`, `Dime`, and `Quarter` are never constructed
[INFO] [stdout]    --> src/syntax/enums.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     enum Coin {
[INFO] [stdout]     |          ---- variants in this enum
[INFO] [stdout] 109 |         Penny,
[INFO] [stdout] 110 |         Nickel,
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout] 111 |         Dime,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 112 |         Quarter,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Alabama` is never constructed
[INFO] [stdout]    --> src/syntax/enums.rs:132:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |     enum UsState {
[INFO] [stdout]     |          ------- variant in this enum
[INFO] [stdout] 132 |         Alabama,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `UsState` 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 `Penny`, `Nickel`, and `Dime` are never constructed
[INFO] [stdout]    --> src/syntax/enums.rs:137:9
[INFO] [stdout]     |
[INFO] [stdout] 136 |     enum Coin2 {
[INFO] [stdout]     |          ----- variants in this enum
[INFO] [stdout] 137 |         Penny,
[INFO] [stdout]     |         ^^^^^
[INFO] [stdout] 138 |         Nickel,
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout] 139 |         Dime,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_divisible_by` is never used
[INFO] [stdout]   --> src/syntax/function.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn is_divisible_by(lhs: u32, rhs: u32) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `customWidth` should have a snake case name
[INFO] [stdout]   --> src/syntax/structs.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let customWidth = 10;
[INFO] [stdout]    |         ^^^^^^^^^^^ help: convert the identifier to snake case: `custom_width`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `isRightWidth` should have a snake case name
[INFO] [stdout]   --> src/syntax/structs.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let isRightWidth = Rectangle::isRightWidth(10);
[INFO] [stdout]    |         ^^^^^^^^^^^^ help: convert the identifier to snake case: `is_right_width`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `isRightWidth` should have a snake case name
[INFO] [stdout]   --> src/syntax/structs.rs:92:8
[INFO] [stdout]    |
[INFO] [stdout] 92 |     fn isRightWidth(width: u32) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^^ help: convert the identifier to snake case: `is_right_width`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `ipV4` should have a snake case name
[INFO] [stdout]  --> src/syntax/enums.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let ipV4 = IpAddrKind::V4;
[INFO] [stdout]   |         ^^^^ help: convert the identifier to snake case: `ip_v4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `ipV6` should have a snake case name
[INFO] [stdout]  --> src/syntax/enums.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let ipV6 = IpAddrKind::V6;
[INFO] [stdout]   |         ^^^^ help: convert the identifier to snake case: `ip_v6`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 79 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 79 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "81dd42d2d8e4ad25c9d8c22857caf6dd97971998d3d20cc7c98607771dbb0a10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81dd42d2d8e4ad25c9d8c22857caf6dd97971998d3d20cc7c98607771dbb0a10", kill_on_drop: false }`
[INFO] [stdout] 81dd42d2d8e4ad25c9d8c22857caf6dd97971998d3d20cc7c98607771dbb0a10