[INFO] cloning repository https://github.com/flamingoodev/rust-learn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/flamingoodev/rust-learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fflamingoodev%2Frust-learn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fflamingoodev%2Frust-learn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 532650d9c30c89e97d3d3a1ff568c509d4754675
[INFO] checking flamingoodev/rust-learn/532650d9c30c89e97d3d3a1ff568c509d4754675 against master#ba7e63b63871a429533c189adbfb1d9a6337e000 for pr-135331-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fflamingoodev%2Frust-learn" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/flamingoodev/rust-learn
[INFO] finished tweaking git repo https://github.com/flamingoodev/rust-learn
[INFO] tweaked toml for git repo https://github.com/flamingoodev/rust-learn written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/flamingoodev/rust-learn on toolchain ba7e63b63871a429533c189adbfb1d9a6337e000
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ba7e63b63871a429533c189adbfb1d9a6337e000" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/flamingoodev/rust-learn 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" "+ba7e63b63871a429533c189adbfb1d9a6337e000" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v1.0.93
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+ba7e63b63871a429533c189adbfb1d9a6337e000" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aba7d633f80b5effbfdf04d4fb21e324ab61587887aa39e1e4041de87eb4fb34
[INFO] running `Command { std: "docker" "start" "-a" "aba7d633f80b5effbfdf04d4fb21e324ab61587887aa39e1e4041de87eb4fb34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aba7d633f80b5effbfdf04d4fb21e324ab61587887aa39e1e4041de87eb4fb34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aba7d633f80b5effbfdf04d4fb21e324ab61587887aa39e1e4041de87eb4fb34", kill_on_drop: false }`
[INFO] [stdout] aba7d633f80b5effbfdf04d4fb21e324ab61587887aa39e1e4041de87eb4fb34
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+ba7e63b63871a429533c189adbfb1d9a6337e000" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9d1c58cf11185a1bee9cb868c8f005277619ac43f5280745317e44884f580dfb
[INFO] running `Command { std: "docker" "start" "-a" "9d1c58cf11185a1bee9cb868c8f005277619ac43f5280745317e44884f580dfb", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.38
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling syn v1.0.93
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling rustversion v1.0.6
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling strum_macros v0.24.0
[INFO] [stderr]     Checking strum v0.24.0
[INFO] [stderr]     Checking rust-learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::panic`
[INFO] [stdout]  --> src/panic/t_panic.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::panic;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/rust_by_example/h_flow_of_control.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |         'inner: loop {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Command` and `Output`
[INFO] [stdout]  --> src/syntax/t_command.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::process::{Command, Output};
[INFO] [stdout]   |                    ^^^^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::str::FromStr`
[INFO] [stdout]  --> src/syntax/t_enum.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::str::FromStr;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::panic::Location`
[INFO] [stdout]  --> src/syntax/t_error.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::panic::Location;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/syntax/t_generic.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/syntax/t_macro.rs:11:20
[INFO] [stdout]    |
[INFO] [stdout] 11 |         (a > b) => { println!("{} < {}", a, b) }
[INFO] [stdout]    |                    ^^                         ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 11 -         (a > b) => { println!("{} < {}", a, b) }
[INFO] [stdout] 11 +         (a > b) => println!("{} < {}", a, b)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc` and `thread`
[INFO] [stdout]  --> src/syntax/t_sync.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         Arc,
[INFO] [stdout]   |         ^^^
[INFO] [stdout] 7 |     },
[INFO] [stdout] 8 |     thread,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Cow`
[INFO] [stdout]  --> src/syntax/t_turbo_fish.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Cow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem::size_of_val`
[INFO] [stdout]  --> src/tests/t_tests.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem::size_of_val;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] help: if this is a test module, consider adding a `#[cfg(test)]` to the containing module
[INFO] [stdout]  --> src/tests/mod.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | mod t_tests;
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/rust_by_example/h_flow_of_control.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |         'inner: loop {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Output`
[INFO] [stdout]  --> src/syntax/t_command.rs:1:29
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::process::{Command, Output};
[INFO] [stdout]   |                             ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::panic::Location`
[INFO] [stdout]  --> src/syntax/t_error.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::panic::Location;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/syntax/t_generic.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/syntax/t_macro.rs:11:20
[INFO] [stdout]    |
[INFO] [stdout] 11 |         (a > b) => { println!("{} < {}", a, b) }
[INFO] [stdout]    |                    ^^                         ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 11 -         (a > b) => { println!("{} < {}", a, b) }
[INFO] [stdout] 11 +         (a > b) => println!("{} < {}", a, b)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Cow`
[INFO] [stdout]  --> src/syntax/t_turbo_fish.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Cow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:170:9
[INFO] [stdout]     |
[INFO] [stdout] 170 |     let x = Operations::Add;
[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] error[E0170]: pattern binding `First` is named the same as one of the variants of the type `rust_quiz::quiz_7::Enum`
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             First => print!("1"),
[INFO] [stdout]    |             ^^^^^ help: to match on the variant, qualify the path: `rust_quiz::quiz_7::Enum::First`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(bindings_with_variant_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0170]: pattern binding `Second` is named the same as one of the variants of the type `rust_quiz::quiz_7::Enum`
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |             Second => print!("2"),
[INFO] [stdout]    |             ^^^^^^ help: to match on the variant, qualify the path: `rust_quiz::quiz_7::Enum::Second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             First => print!("1"),
[INFO] [stdout]    |             ----- matches any value
[INFO] [stdout] 14 |             Second => print!("2"),
[INFO] [stdout]    |             ^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `First`
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             First => print!("1"),
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_First`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Second`
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |             Second => print!("2"),
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_Second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `location`
[INFO] [stdout]   --> src/syntax/t_error.rs:38:18
[INFO] [stdout]    |
[INFO] [stdout] 38 |             Some(location) => {
[INFO] [stdout]    |                  ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_location`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y1`
[INFO] [stdout]   --> src/syntax/t_smart_pointer.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let y1 = x.borrow_mut();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_y1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]  --> src/syntax/t_type.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let num = 42u32;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]  --> src/syntax/t_type.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let num: u32 = 42;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]  --> src/syntax/t_type.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let num = 0x2A; // 十六进制
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]  --> src/syntax/t_type.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let num = 0o106; // 八进制
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/syntax/t_type.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let num = 3.55f64;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/syntax/t_type.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let mut mut_arr = [1, 2, 3];
[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: function `if_let` is never used
[INFO] [stdout]   --> src/collections/t_vector.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn if_let() -> u8 {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/collections/t_vector.rs:58:8
[INFO] [stdout]    |
[INFO] [stdout] 58 | #[warn(dead_code)]
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vec_slice` is never used
[INFO] [stdout]   --> src/collections/t_vector.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn vec_slice() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_slice` is never used
[INFO] [stdout]   --> src/collections/t_vector.rs:93:4
[INFO] [stdout]    |
[INFO] [stdout] 93 | fn print_slice<T: fmt::Debug>(s: &[T]) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_slice1` is never used
[INFO] [stdout]   --> src/collections/t_vector.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn print_slice1<T, U>(s: T)
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `while_let` is never used
[INFO] [stdout]    --> src/collections/t_vector.rs:111:4
[INFO] [stdout]     |
[INFO] [stdout] 111 | fn while_let() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/collections/t_vector.rs:110:8
[INFO] [stdout]     |
[INFO] [stdout] 110 | #[warn(dead_code)]
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Sharpe` is never constructed
[INFO] [stdout]  --> src/examples/t_struct.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Sharpe<T> {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/examples/t_struct.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Circle` is never constructed
[INFO] [stdout]   --> src/examples/t_struct.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct Circle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Area` is never used
[INFO] [stdout]   --> src/examples/t_struct.rs:23:11
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub trait Area {
[INFO] [stdout]    |           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum` is never used
[INFO] [stdout]  --> src/panic/t_panic.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn sum(a: i32, b: i32) -> i32 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pri_print_role` is never used
[INFO] [stdout]  --> src/routes/role.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn pri_print_role() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]  --> src/routes/role.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | #[warn(dead_code)]
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pri_print_user` is never used
[INFO] [stdout]  --> src/routes/user.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn pri_print_user() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello_world` is never used
[INFO] [stdout]  --> src/rust_by_example/a_hello_world.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn hello_world() {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `comment` is never used
[INFO] [stdout]   --> src/rust_by_example/a_hello_world.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn comment() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `formatted_print` is never used
[INFO] [stdout]   --> src/rust_by_example/a_hello_world.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn formatted_print() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UnPrintable` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:130:8
[INFO] [stdout]     |
[INFO] [stdout] 130 | struct UnPrintable(i32);
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DebugPrintable` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:134:8
[INFO] [stdout]     |
[INFO] [stdout] 134 | struct DebugPrintable(i32);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Structure` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:139:8
[INFO] [stdout]     |
[INFO] [stdout] 139 | struct Structure(i32);
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Deep` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 143 | struct Deep(Structure);
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `std_print` is never used
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn std_print() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MinMax` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:202:8
[INFO] [stdout]     |
[INFO] [stdout] 202 | struct MinMax(i64, i64);
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point2D` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:214:8
[INFO] [stdout]     |
[INFO] [stdout] 214 | struct Point2D {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `display_1` is never used
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:227:4
[INFO] [stdout]     |
[INFO] [stdout] 227 | fn display_1() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `List` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:274:8
[INFO] [stdout]     |
[INFO] [stdout] 274 | struct List(Vec<i32>);
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `City` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:316:8
[INFO] [stdout]     |
[INFO] [stdout] 316 | struct City {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:345:8
[INFO] [stdout]     |
[INFO] [stdout] 345 | struct Color {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `format` is never used
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:351:4
[INFO] [stdout]     |
[INFO] [stdout] 351 | fn format() {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `operator` is never used
[INFO] [stdout]   --> src/rust_by_example/b_primitives.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn operator() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reverse` is never used
[INFO] [stdout]   --> src/rust_by_example/b_primitives.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn reverse(pair: (i32, bool)) -> (bool, i32) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Matrix` is never constructed
[INFO] [stdout]    --> src/rust_by_example/b_primitives.rs:107:8
[INFO] [stdout]     |
[INFO] [stdout] 107 | struct Matrix(f32, f32, f32, f32);
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple` is never used
[INFO] [stdout]    --> src/rust_by_example/b_primitives.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn tuple() {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `analyze_slice` is never used
[INFO] [stdout]    --> src/rust_by_example/b_primitives.rs:165:4
[INFO] [stdout]     |
[INFO] [stdout] 165 | fn analyze_slice(slice: &[i32]) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `arr` is never used
[INFO] [stdout]    --> src/rust_by_example/b_primitives.rs:170:4
[INFO] [stdout]     |
[INFO] [stdout] 170 | fn arr() {
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/rust_by_example/c_custom_types.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Person {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Unit` is never constructed
[INFO] [stdout]   --> src/rust_by_example/c_custom_types.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct Unit;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]   --> src/rust_by_example/c_custom_types.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | struct Pair(i32, f32);
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/rust_by_example/c_custom_types.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct Point {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 29 |     x: f32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 30 |     y: f32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `custom_struct` is never used
[INFO] [stdout]   --> src/rust_by_example/c_custom_types.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn custom_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `WebEvent` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:108:6
[INFO] [stdout]     |
[INFO] [stdout] 108 | enum WebEvent {
[INFO] [stdout]     |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inspect` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:120:4
[INFO] [stdout]     |
[INFO] [stdout] 120 | fn inspect(event: WebEvent) {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `custom_enum` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn custom_enum() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Subtract` is never constructed
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:160:5
[INFO] [stdout]     |
[INFO] [stdout] 158 | enum VeryVerboseEnumOfThingsToDoWithNumbers {
[INFO] [stdout]     |      -------------------------------------- variant in this enum
[INFO] [stdout] 159 |     Add,
[INFO] [stdout] 160 |     Subtract,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `run` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:181:8
[INFO] [stdout]     |
[INFO] [stdout] 180 | impl VeryVerboseEnumOfThingsToDoWithNumbers {
[INFO] [stdout]     | ------------------------------------------- method in this implementation
[INFO] [stdout] 181 |     fn run(&self, x: i32, y: i32) -> i32 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Work` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:199:6
[INFO] [stdout]     |
[INFO] [stdout] 199 | enum Work {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `enum_use` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:204:4
[INFO] [stdout]     |
[INFO] [stdout] 204 | fn enum_use() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Color` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:247:6
[INFO] [stdout]     |
[INFO] [stdout] 247 | enum Color {
[INFO] [stdout]     |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `enum_lick_c` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:253:4
[INFO] [stdout]     |
[INFO] [stdout] 253 | fn enum_lick_c() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:271:6
[INFO] [stdout]     |
[INFO] [stdout] 271 | enum List {
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `prepend`, `len`, and `stringify` are never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:281:8
[INFO] [stdout]     |
[INFO] [stdout] 279 | impl List {
[INFO] [stdout]     | --------- associated items in this implementation
[INFO] [stdout] 280 |     // 创建一个空的 List 实例
[INFO] [stdout] 281 |     fn new() -> List {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 287 |     fn prepend(self, elem: u32) -> List {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 293 |     fn len(&self) -> u32 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 308 |     fn stringify(&self) -> String {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `list` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:322:4
[INFO] [stdout]     |
[INFO] [stdout] 322 | fn list() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `LANGUAGE` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:351:8
[INFO] [stdout]     |
[INFO] [stdout] 351 | static LANGUAGE: &'static str = "Rust";
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `THRESHOLD` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:352:7
[INFO] [stdout]     |
[INFO] [stdout] 352 | const THRESHOLD: i32 = 10;
[INFO] [stdout]     |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_big` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:354:4
[INFO] [stdout]     |
[INFO] [stdout] 354 | fn is_big(n: i32) -> bool {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variable_bindings` is never used
[INFO] [stdout]  --> src/rust_by_example/d_variable_bindings.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn variable_bindings() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mut_variable` is never used
[INFO] [stdout]   --> src/rust_by_example/d_variable_bindings.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn mut_variable() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variable_scope` is never used
[INFO] [stdout]   --> src/rust_by_example/d_variable_bindings.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn variable_scope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variable_declare` is never used
[INFO] [stdout]   --> src/rust_by_example/d_variable_bindings.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn variable_declare() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variable_freeze` is never used
[INFO] [stdout]    --> src/rust_by_example/d_variable_bindings.rs:130:4
[INFO] [stdout]     |
[INFO] [stdout] 130 | fn variable_freeze() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `types` is never used
[INFO] [stdout]   --> src/rust_by_example/e_types.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn types() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `literals` is never used
[INFO] [stdout]   --> src/rust_by_example/e_types.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn literals() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inference` is never used
[INFO] [stdout]    --> src/rust_by_example/e_types.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn inference() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `NanoSecond` is never used
[INFO] [stdout]    --> src/rust_by_example/e_types.rs:133:6
[INFO] [stdout]     |
[INFO] [stdout] 133 | type NanoSecond = u64;
[INFO] [stdout]     |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Inch` is never used
[INFO] [stdout]    --> src/rust_by_example/e_types.rs:134:6
[INFO] [stdout]     |
[INFO] [stdout] 134 | type Inch = u64;
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `u64_t` is never used
[INFO] [stdout]    --> src/rust_by_example/e_types.rs:138:6
[INFO] [stdout]     |
[INFO] [stdout] 138 | type u64_t = u64;
[INFO] [stdout]     |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `alias` is never used
[INFO] [stdout]    --> src/rust_by_example/e_types.rs:141:4
[INFO] [stdout]     |
[INFO] [stdout] 141 | fn alias() {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Number` is never constructed
[INFO] [stdout]   --> src/rust_by_example/f_conversion.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Number {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `from_trait` is never used
[INFO] [stdout]   --> src/rust_by_example/f_conversion.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn from_trait() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Number1` is never constructed
[INFO] [stdout]   --> src/rust_by_example/f_conversion.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 | struct Number1 {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `into` is never used
[INFO] [stdout]   --> src/rust_by_example/f_conversion.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn into() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `EvenNumber` is never constructed
[INFO] [stdout]   --> src/rust_by_example/f_conversion.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 | struct EvenNumber(i32);
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `try_from` is never used
[INFO] [stdout]   --> src/rust_by_example/f_conversion.rs:92:4
[INFO] [stdout]    |
[INFO] [stdout] 92 | fn try_from() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Circle` is never constructed
[INFO] [stdout]    --> src/rust_by_example/f_conversion.rs:118:8
[INFO] [stdout]     |
[INFO] [stdout] 118 | struct Circle {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `to_string` is never used
[INFO] [stdout]    --> src/rust_by_example/f_conversion.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn to_string() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `from_str` is never used
[INFO] [stdout]    --> src/rust_by_example/f_conversion.rs:145:4
[INFO] [stdout]     |
[INFO] [stdout] 145 | fn from_str() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `t0` is never used
[INFO] [stdout]  --> src/rust_by_example/g_expressions.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn t0() {
[INFO] [stdout]   |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `t1` is never used
[INFO] [stdout]   --> src/rust_by_example/g_expressions.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn t1() {
[INFO] [stdout]    |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `t2` is never used
[INFO] [stdout]   --> src/rust_by_example/g_expressions.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn t2() {
[INFO] [stdout]    |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `if_else` is never used
[INFO] [stdout]  --> src/rust_by_example/h_flow_of_control.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn if_else() {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flow_loop` is never used
[INFO] [stdout]   --> src/rust_by_example/h_flow_of_control.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn flow_loop() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `label_loop` is never used
[INFO] [stdout]   --> src/rust_by_example/h_flow_of_control.rs:83:4
[INFO] [stdout]    |
[INFO] [stdout] 83 | fn label_loop() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fizz_buzz` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn fizz_buzz() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_fizz_buzz` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:161:4
[INFO] [stdout]     |
[INFO] [stdout] 161 | fn for_fizz_buzz() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_fizz_buzz_1` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:184:4
[INFO] [stdout]     |
[INFO] [stdout] 184 | fn for_fizz_buzz_1() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_iter` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:208:4
[INFO] [stdout]     |
[INFO] [stdout] 208 | fn for_iter() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_iter_1` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:229:4
[INFO] [stdout]     |
[INFO] [stdout] 229 | fn for_iter_1() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_iter_2` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:242:4
[INFO] [stdout]     |
[INFO] [stdout] 242 | fn for_iter_2() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flow_match` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:261:4
[INFO] [stdout]     |
[INFO] [stdout] 261 | fn flow_match() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `destructuring_tuples` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:307:4
[INFO] [stdout]     |
[INFO] [stdout] 307 | fn destructuring_tuples() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `destructuring_enum` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:340:4
[INFO] [stdout]     |
[INFO] [stdout] 340 | fn destructuring_enum() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `destructuring_ref` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:369:4
[INFO] [stdout]     |
[INFO] [stdout] 369 | fn destructuring_ref() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `destructuring_struct` is never used
[INFO] [stdout]    --> src/rust_by_example/h_flow_of_control.rs:421:4
[INFO] [stdout]     |
[INFO] [stdout] 421 | fn destructuring_struct() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_divisible_by` is never used
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn is_divisible_by(lhs: u32, rhs: u32) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fizzbuzz` is never used
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn fizzbuzz(n: u32) -> () {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fizzbuzz_to` is never used
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn fizzbuzz_to(n: u32) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | struct Point {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `origin` and `new` are never used
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 56 | impl Point {
[INFO] [stdout]    | ---------- associated functions in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 60 |     fn origin() -> Point {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 65 |     fn new(x: f64, y: f64) -> Point {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 70 | struct Rectangle {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `area`, `perimeter`, and `translate` are never used
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 75 | impl Rectangle {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 79 |     fn area(&self) -> f64 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 88 |     fn perimeter(&self) -> f64 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 97 |     fn translate(&mut self, x: f64, y: f64) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]    --> src/rust_by_example/i_functions.rs:107:8
[INFO] [stdout]     |
[INFO] [stdout] 107 | struct Pair(Box<i32>, Box<i32>);
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `destroy` is never used
[INFO] [stdout]    --> src/rust_by_example/i_functions.rs:112:8
[INFO] [stdout]     |
[INFO] [stdout] 109 | impl Pair {
[INFO] [stdout]     | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 112 |     fn destroy(self) {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/rust_by_example/i_functions.rs:122:4
[INFO] [stdout]     |
[INFO] [stdout] 122 | fn main() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]  --> src/rust_quiz/quiz_18.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct S {
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `f` is never used
[INFO] [stdout]  --> src/rust_quiz/quiz_18.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | impl S {
[INFO] [stdout]   | ------ method in this implementation
[INFO] [stdout] 9 |     fn f(&self) {
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `S` is never constructed
[INFO] [stdout]  --> src/rust_quiz/quiz_3.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct S {
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `S` is never used
[INFO] [stdout]  --> src/rust_quiz/quiz_3.rs:8:7
[INFO] [stdout]   |
[INFO] [stdout] 8 | const S: S = S { x: 2 };
[INFO] [stdout]   |       ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Enum` is never used
[INFO] [stdout]  --> src/rust_quiz/quiz_7.rs:5:6
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum Enum {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `p` is never used
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl Enum {
[INFO] [stdout]    | --------- method in this implementation
[INFO] [stdout] 11 |     fn p(self) {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_master_pointer` is never used
[INFO] [stdout]  --> src/smartpointer/t_smart_pointer.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn test_master_pointer() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `age` is never used
[INFO] [stdout]  --> src/syntax/t_bind.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn age() -> u32 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `math` is never used
[INFO] [stdout]   --> src/syntax/t_closure.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn math<F: Fn() -> i32>(op: F) -> i32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/syntax/t_closure.rs:9:8
[INFO] [stdout]    |
[INFO] [stdout]  9 | #[warn(dead_code)]
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `call` is never used
[INFO] [stdout]   --> src/syntax/t_closure.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn call<F: FnOnce()>(f: F) {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Color` is never used
[INFO] [stdout]   --> src/syntax/t_enum.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | enum Color {
[INFO] [stdout]    |      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `math` is never used
[INFO] [stdout]  --> src/syntax/t_function.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn math(op: fn(i32, i32) -> i32, a: i32, b: i32) -> i32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum` is never used
[INFO] [stdout]  --> src/syntax/t_function.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn sum(a: i32, b: i32) -> i32 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `product` is never used
[INFO] [stdout]   --> src/syntax/t_function.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn product(a: i32, b: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mat` is never used
[INFO] [stdout]   --> src/syntax/t_function.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn mat(op: fn(i32, i32) -> i32, a: i32, b: i32) -> i32 {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello` is never used
[INFO] [stdout]   --> src/syntax/t_function.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn hello() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `init_len` is never used
[INFO] [stdout]   --> src/syntax/t_function.rs:24:10
[INFO] [stdout]    |
[INFO] [stdout] 24 | const fn init_len() -> usize {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `A` is never constructed
[INFO] [stdout]   --> src/syntax/t_generic.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct A {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `B` is never constructed
[INFO] [stdout]   --> src/syntax/t_generic.rs:58:8
[INFO] [stdout]    |
[INFO] [stdout] 58 | struct B {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/syntax/t_generic.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square` is never used
[INFO] [stdout]    --> src/syntax/t_generic.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn square<T: Mul + Mul<Output = T>>(x: T, y: T) -> T {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square1` is never used
[INFO] [stdout]    --> src/syntax/t_generic.rs:105:4
[INFO] [stdout]     |
[INFO] [stdout] 105 | fn square1<T: Mul<T, Output = T>>(x: T, y: T) -> T {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cmp` is never used
[INFO] [stdout]  --> src/syntax/t_macro.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn cmp(a: i32, b: i32) {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inverse` is never used
[INFO] [stdout]  --> src/syntax/t_option.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn inverse(number: f64) -> f64 {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `double` is never used
[INFO] [stdout]  --> src/syntax/t_option.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn double(number: f64) -> Option<f64> {
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `none` is never used
[INFO] [stdout]  --> src/syntax/t_option.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn none(number: f64) -> Option<f64> {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square` is never used
[INFO] [stdout]   --> src/syntax/t_result.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn square(number_str: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `ParseResult` is never used
[INFO] [stdout]   --> src/syntax/t_result.rs:34:6
[INFO] [stdout]    |
[INFO] [stdout] 34 | type ParseResult<T> = Result<T, ParseIntError>;
[INFO] [stdout]    |      ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square_1` is never used
[INFO] [stdout]   --> src/syntax/t_result.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn square_1(number_str: &str) -> ParseResult<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Test` is never constructed
[INFO] [stdout]  --> src/syntax/t_size.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Test<'a> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abs_sum` is never used
[INFO] [stdout]   --> src/syntax/t_smart_pointer.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn abs_sum(ns: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stark` is never used
[INFO] [stdout]   --> src/syntax/t_string.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn stark() -> &'static str {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Book` is never constructed
[INFO] [stdout]  --> src/syntax/t_struct.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Book<'a> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BookMove` is never constructed
[INFO] [stdout]  --> src/syntax/t_struct.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct BookMove {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Lock` is never constructed
[INFO] [stdout]   --> src/syntax/t_sync.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Lock<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `lock` are never used
[INFO] [stdout]   --> src/syntax/t_sync.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 28 | impl<T> Lock<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 29 |     pub fn new(data: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn lock(&self, op: impl FnOnce(&mut T)) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `turbo_fish` is never used
[INFO] [stdout]  --> src/syntax/t_turbo_fish.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn turbo_fish() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement with no effect
[INFO] [stdout]   --> src/rust_by_example/g_expressions.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     x;
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/rust_by_example/g_expressions.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     x + 1;
[INFO] [stdout]    |     ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let _ = x + 1;
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/rust_by_example/g_expressions.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |         2 * x;
[INFO] [stdout]    |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 38 |         let _ = 2 * x;
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `First` should have a snake case name
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             First => print!("1"),
[INFO] [stdout]    |             ^^^^^ help: convert the identifier to snake case (notice the capitalization): `first`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Second` should have a snake case name
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |             Second => print!("2"),
[INFO] [stdout]    |             ^^^^^^ help: convert the identifier to snake case (notice the capitalization): `second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0170`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-learn` (lib) due to 2 previous errors; 165 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:170:9
[INFO] [stdout]     |
[INFO] [stdout] 170 |     let x = Operations::Add;
[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: taking a mutable reference to a `const` item
[INFO] [stdout]   --> src/rust_quiz/quiz_3.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let v = &mut S;
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: each usage of a `const` item creates a new temporary
[INFO] [stdout]    = note: the mutable reference will refer to this temporary, not the original `const` item
[INFO] [stdout] note: `const` item defined here
[INFO] [stdout]   --> src/rust_quiz/quiz_3.rs:8:1
[INFO] [stdout]    |
[INFO] [stdout]  8 | const S: S = S { x: 2 };
[INFO] [stdout]    | ^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(const_item_mutation)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: attempting to modify a `const` item
[INFO] [stdout]   --> src/rust_quiz/quiz_3.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     S.x += 1;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: each usage of a `const` item creates a new temporary; the original `const` item will not be modified
[INFO] [stdout] note: `const` item defined here
[INFO] [stdout]   --> src/rust_quiz/quiz_3.rs:8:1
[INFO] [stdout]    |
[INFO] [stdout]  8 | const S: S = S { x: 2 };
[INFO] [stdout]    | ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0170]: pattern binding `First` is named the same as one of the variants of the type `rust_quiz::quiz_7::Enum`
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             First => print!("1"),
[INFO] [stdout]    |             ^^^^^ help: to match on the variant, qualify the path: `rust_quiz::quiz_7::Enum::First`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(bindings_with_variant_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0170]: pattern binding `Second` is named the same as one of the variants of the type `rust_quiz::quiz_7::Enum`
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |             Second => print!("2"),
[INFO] [stdout]    |             ^^^^^^ help: to match on the variant, qualify the path: `rust_quiz::quiz_7::Enum::Second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             First => print!("1"),
[INFO] [stdout]    |             ----- matches any value
[INFO] [stdout] 14 |             Second => print!("2"),
[INFO] [stdout]    |             ^^^^^^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `First`
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             First => print!("1"),
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_First`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `Second`
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |             Second => print!("2"),
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_Second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/syntax/t_closure.rs:111:26
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let incr_x = move || x += 1;
[INFO] [stdout]     |                          ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: did you mean to capture by reference instead?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `location`
[INFO] [stdout]   --> src/syntax/t_error.rs:38:18
[INFO] [stdout]    |
[INFO] [stdout] 38 |             Some(location) => {
[INFO] [stdout]    |                  ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_location`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: taking a reference to a function item does not give a function pointer
[INFO] [stdout]   --> src/syntax/t_function.rs:49:32
[INFO] [stdout]    |
[INFO] [stdout] 49 |     let addr = format!("{:p}", &fn_ptr);
[INFO] [stdout]    |                                ^^^^^^^ help: cast `hello` to obtain a function pointer: `hello as fn()`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(function_item_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y1`
[INFO] [stdout]   --> src/syntax/t_smart_pointer.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let y1 = x.borrow_mut();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_y1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/syntax/t_string.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let mut x = 'T';
[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: `num`
[INFO] [stdout]  --> src/syntax/t_type.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let num = 42u32;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]  --> src/syntax/t_type.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let num: u32 = 42;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]  --> src/syntax/t_type.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let num = 0x2A; // 十六进制
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]  --> src/syntax/t_type.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let num = 0o106; // 八进制
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/syntax/t_type.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let num = 3.55f64;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/syntax/t_type.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let mut mut_arr = [1, 2, 3];
[INFO] [stdout]    |         ----^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pri_print_role` is never used
[INFO] [stdout]  --> src/routes/role.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn pri_print_role() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]  --> src/routes/role.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | #[warn(dead_code)]
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `pri_print_user` is never used
[INFO] [stdout]  --> src/routes/user.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn pri_print_user() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UnPrintable` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:130:8
[INFO] [stdout]     |
[INFO] [stdout] 130 | struct UnPrintable(i32);
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DebugPrintable` is never constructed
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:134:8
[INFO] [stdout]     |
[INFO] [stdout] 134 | struct DebugPrintable(i32);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:139:18
[INFO] [stdout]     |
[INFO] [stdout] 139 | struct Structure(i32);
[INFO] [stdout]     |        --------- ^^^
[INFO] [stdout]     |        |
[INFO] [stdout]     |        field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing this field
[INFO] [stdout]     = note: `Structure` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:143:13
[INFO] [stdout]     |
[INFO] [stdout] 143 | struct Deep(Structure);
[INFO] [stdout]     |        ---- ^^^^^^^^^
[INFO] [stdout]     |        |
[INFO] [stdout]     |        field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing this field
[INFO] [stdout]     = note: `Deep` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `red`, `green`, and `blue` are never read
[INFO] [stdout]    --> src/rust_by_example/a_hello_world.rs:346:5
[INFO] [stdout]     |
[INFO] [stdout] 345 | struct Color {
[INFO] [stdout]     |        ----- fields in this struct
[INFO] [stdout] 346 |     red: u8,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 347 |     green: u8,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 348 |     blue: u8,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Color` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]    --> src/rust_by_example/b_primitives.rs:107:15
[INFO] [stdout]     |
[INFO] [stdout] 107 | struct Matrix(f32, f32, f32, f32);
[INFO] [stdout]     |        ------ ^^^  ^^^  ^^^  ^^^
[INFO] [stdout]     |        |
[INFO] [stdout]     |        fields in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing these fields
[INFO] [stdout]     = note: `Matrix` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `age` are never read
[INFO] [stdout]   --> src/rust_by_example/c_custom_types.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Person {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 17 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 18 |     age: u8,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Subtract` is never constructed
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:160:5
[INFO] [stdout]     |
[INFO] [stdout] 158 | enum VeryVerboseEnumOfThingsToDoWithNumbers {
[INFO] [stdout]     |      -------------------------------------- variant in this enum
[INFO] [stdout] 159 |     Add,
[INFO] [stdout] 160 |     Subtract,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `run` is never used
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:181:8
[INFO] [stdout]     |
[INFO] [stdout] 180 | impl VeryVerboseEnumOfThingsToDoWithNumbers {
[INFO] [stdout]     | ------------------------------------------- method in this implementation
[INFO] [stdout] 181 |     fn run(&self, x: i32, y: i32) -> i32 {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Soldier` is never constructed
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:201:5
[INFO] [stdout]     |
[INFO] [stdout] 199 | enum Work {
[INFO] [stdout]     |      ---- variant in this enum
[INFO] [stdout] 200 |     Civilian,
[INFO] [stdout] 201 |     Soldier,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Green` is never constructed
[INFO] [stdout]    --> src/rust_by_example/c_custom_types.rs:249:5
[INFO] [stdout]     |
[INFO] [stdout] 247 | enum Color {
[INFO] [stdout]     |      ----- variant in this enum
[INFO] [stdout] 248 |     Red = 0xff0000,
[INFO] [stdout] 249 |     Green = 0x00ff00,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/rust_by_example/f_conversion.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Number {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 24 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/rust_by_example/f_conversion.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 49 | struct Number1 {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 50 |     value: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Number1` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `t0` is never used
[INFO] [stdout]  --> src/rust_by_example/g_expressions.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn t0() {
[INFO] [stdout]   |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `t1` is never used
[INFO] [stdout]   --> src/rust_by_example/g_expressions.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn t1() {
[INFO] [stdout]    |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `label_loop` is never used
[INFO] [stdout]   --> src/rust_by_example/h_flow_of_control.rs:83:4
[INFO] [stdout]    |
[INFO] [stdout] 83 | fn label_loop() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | struct Point {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `origin` and `new` are never used
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 56 | impl Point {
[INFO] [stdout]    | ---------- associated functions in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 60 |     fn origin() -> Point {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 65 |     fn new(x: f64, y: f64) -> Point {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 70 | struct Rectangle {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `area`, `perimeter`, and `translate` are never used
[INFO] [stdout]   --> src/rust_by_example/i_functions.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 75 | impl Rectangle {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 79 |     fn area(&self) -> f64 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 88 |     fn perimeter(&self) -> f64 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 97 |     fn translate(&mut self, x: f64, y: f64) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pair` is never constructed
[INFO] [stdout]    --> src/rust_by_example/i_functions.rs:107:8
[INFO] [stdout]     |
[INFO] [stdout] 107 | struct Pair(Box<i32>, Box<i32>);
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `destroy` is never used
[INFO] [stdout]    --> src/rust_by_example/i_functions.rs:112:8
[INFO] [stdout]     |
[INFO] [stdout] 109 | impl Pair {
[INFO] [stdout]     | --------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 112 |     fn destroy(self) {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/rust_by_example/i_functions.rs:122:4
[INFO] [stdout]     |
[INFO] [stdout] 122 | fn main() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `f` is never read
[INFO] [stdout]  --> src/rust_quiz/quiz_18.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct S {
[INFO] [stdout]   |        - field in this struct
[INFO] [stdout] 5 |     f: fn(),
[INFO] [stdout]   |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `First` and `Second` are never constructed
[INFO] [stdout]  --> src/rust_quiz/quiz_7.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | enum Enum {
[INFO] [stdout]   |      ---- variants in this enum
[INFO] [stdout] 6 |     First,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 7 |     Second,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Green` is never constructed
[INFO] [stdout]   --> src/syntax/t_enum.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | enum Color {
[INFO] [stdout]    |      ----- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 24 |     Green(String),
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Color` 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 `A` is never constructed
[INFO] [stdout]   --> src/syntax/t_generic.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct A {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `B` is never constructed
[INFO] [stdout]   --> src/syntax/t_generic.rs:58:8
[INFO] [stdout]    |
[INFO] [stdout] 58 | struct B {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/syntax/t_generic.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Test` is never constructed
[INFO] [stdout]  --> src/syntax/t_size.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Test<'a> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abs_sum` is never used
[INFO] [stdout]   --> src/syntax/t_smart_pointer.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn abs_sum(ns: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `isbn` and `version` are never read
[INFO] [stdout]  --> src/syntax/t_struct.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Book<'a> {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     name: &'a str,
[INFO] [stdout] 4 |     isbn: i32,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 5 |     version: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Book` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BookMove` is never constructed
[INFO] [stdout]  --> src/syntax/t_struct.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct BookMove {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: path statement with no effect
[INFO] [stdout]   --> src/rust_by_example/g_expressions.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     x;
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(path_statements)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/rust_by_example/g_expressions.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     x + 1;
[INFO] [stdout]    |     ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let _ = x + 1;
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/rust_by_example/g_expressions.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |         2 * x;
[INFO] [stdout]    |         ^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 38 |         let _ = 2 * x;
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `First` should have a snake case name
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |             First => print!("1"),
[INFO] [stdout]    |             ^^^^^ help: convert the identifier to snake case (notice the capitalization): `first`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Second` should have a snake case name
[INFO] [stdout]   --> src/rust_quiz/quiz_7.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |             Second => print!("2"),
[INFO] [stdout]    |             ^^^^^^ help: convert the identifier to snake case (notice the capitalization): `second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0170`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-learn` (lib test) due to 2 previous errors; 63 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "9d1c58cf11185a1bee9cb868c8f005277619ac43f5280745317e44884f580dfb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d1c58cf11185a1bee9cb868c8f005277619ac43f5280745317e44884f580dfb", kill_on_drop: false }`
[INFO] [stdout] 9d1c58cf11185a1bee9cb868c8f005277619ac43f5280745317e44884f580dfb