[INFO] cloning repository https://github.com/helloyzp/RustProject
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/helloyzp/RustProject" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhelloyzp%2FRustProject", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhelloyzp%2FRustProject'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9cde9c7f4ba939c04c70790ee5ec5a6d9eaeec41
[INFO] checking helloyzp/RustProject against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhelloyzp%2FRustProject" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/helloyzp/RustProject on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/helloyzp/RustProject
[INFO] finished tweaking git repo https://github.com/helloyzp/RustProject
[INFO] tweaked toml for git repo https://github.com/helloyzp/RustProject written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/helloyzp/RustProject already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "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-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 81482b9d16d13a636f40491e1ee2391314fcbca5ac29c4c97d4f89bd8a83b539
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "81482b9d16d13a636f40491e1ee2391314fcbca5ac29c4c97d4f89bd8a83b539", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "81482b9d16d13a636f40491e1ee2391314fcbca5ac29c4c97d4f89bd8a83b539", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81482b9d16d13a636f40491e1ee2391314fcbca5ac29c4c97d4f89bd8a83b539", kill_on_drop: false }`
[INFO] [stdout] 81482b9d16d13a636f40491e1ee2391314fcbca5ac29c4c97d4f89bd8a83b539
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 28dee115f86ffc7b86d7daeea8bdbbd35b11eca613b84b7c8756bfe0622b432b
[INFO] running `Command { std: "docker" "start" "-a" "28dee115f86ffc7b86d7daeea8bdbbd35b11eca613b84b7c8756bfe0622b432b", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking RustProject v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/super_demo.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/macro_demo.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/bin/owner_demo.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/bin/macro_demo.rs (1 fix)
[INFO] [stderr]        Fixed src/ch06/enums.rs (11 fixes)
[INFO] [stderr]        Fixed src/ch04/ownership.rs (7 fixes)
[INFO] [stderr]        Fixed src/ch05/struct_demo.rs (5 fixes)
[INFO] [stderr]        Fixed src/ch03/basic_concepts.rs (2 fixes)
[INFO] [stderr]        Fixed src/main.rs (2 fixes)
[INFO] [stdout] warning: unused macro definition
[INFO] [stdout]   --> src/bin/macro_demo.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | / macro_rules! print_hello {
[INFO] [stdout] 12 | |     ()=> {
[INFO] [stdout] 13 | |      println!("hello world！");
[INFO] [stdout] 14 | |     }
[INFO] [stdout] 15 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]    --> src/ch06/enums.rs:206:17
[INFO] [stdout]     |
[INFO] [stdout] 206 |         let mut count = 0;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06/enums.rs:209:18
[INFO] [stdout]     |
[INFO] [stdout] 209 |             _ => count += 1,
[INFO] [stdout]     |                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]    --> src/ch06/enums.rs:214:17
[INFO] [stdout]     |
[INFO] [stdout] 214 |         let mut count = 0;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06/enums.rs:218:13
[INFO] [stdout]     |
[INFO] [stdout] 218 |             count += 1;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello`
[INFO] [stdout]  --> src/hello.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn print_hello() {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello2`
[INFO] [stdout]  --> src/printHello/hello2.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn print_hello2() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_mod_hello`
[INFO] [stdout]   --> src/printHello/hello2.rs:15:19
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub(crate) fn sub_mod_hello() {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_mod2_print_hello`
[INFO] [stdout]   --> src/printHello/hello2.rs:20:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |         pub fn sub_mod2_print_hello() {
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello3`
[INFO] [stdout]  --> src/printHello/hello3.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn print_hello3() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `unsigned_64`
[INFO] [stdout]  --> src/common/type_demo.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | type unsigned_64 = u64;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Unsigned64`
[INFO] [stdout]   --> src/common/type_demo.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | type Unsigned64 = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `ConcreteError`
[INFO] [stdout]   --> src/common/type_demo.rs:24:10
[INFO] [stdout]    |
[INFO] [stdout] 24 |     enum ConcreteError {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]   --> src/common/type_demo.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     type Result<T> = result::Result<T, ConcreteError>;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Balance`
[INFO] [stdout]   --> src/common/type_demo.rs:36:1
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub type Balance = u128;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Weight`
[INFO] [stdout]   --> src/common/type_demo.rs:50:1
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub type Weight = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `f`
[INFO] [stdout]  --> src/common/unittype.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn f() {
[INFO] [stdout]   |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `f2`
[INFO] [stdout]  --> src/common/unittype.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn f2() {
[INFO] [stdout]   |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch03/basic_concepts.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `variable`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn variable() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `variable2`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn variable2() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shadow`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn shadow() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tupleDemo`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn tupleDemo() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `another_function`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn another_function(x: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `five`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn five() -> i32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_break`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn  loop_break() {
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_while`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn test_while() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_for`
[INFO] [stdout]    --> src/ch03/basic_concepts.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn test_for() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch04/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_move`
[INFO] [stdout]   --> src/ch04/ownership.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn test_move() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_OwnershipandFunctions`
[INFO] [stdout]   --> src/ch04/ownership.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn test_OwnershipandFunctions() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]   --> src/ch04/ownership.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn takes_ownership(some_string: String) { // some_string 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `makes_copy`
[INFO] [stdout]   --> src/ch04/ownership.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn makes_copy(some_integer: i32) { // some_integer 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_ReturnValuesAndScope`
[INFO] [stdout]   --> src/ch04/ownership.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn test_ReturnValuesAndScope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gives_ownership`
[INFO] [stdout]   --> src/ch04/ownership.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn gives_ownership() -> String {                        // gives_ownership 将返回值移动给调用它的函数
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_and_gives_back`
[INFO] [stdout]   --> src/ch04/ownership.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn takes_and_gives_back(a_string: String) -> String { // a_string 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_touple`
[INFO] [stdout]    --> src/ch04/ownership.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn test_touple() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[INFO] [stdout]    --> src/ch04/ownership.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn test_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change`
[INFO] [stdout]    --> src/ch04/ownership.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn change(_some_string: &String) {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_mutable_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn test_mutable_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change2`
[INFO] [stdout]    --> src/ch04/ownership.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn change2(some_string: &mut String) {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_multi_mutable_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:157:4
[INFO] [stdout]     |
[INFO] [stdout] 157 | fn test_multi_mutable_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_multi_mutable_borrowing2`
[INFO] [stdout]    --> src/ch04/ownership.rs:170:4
[INFO] [stdout]     |
[INFO] [stdout] 170 | fn test_multi_mutable_borrowing2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_find_first_word`
[INFO] [stdout]    --> src/ch04/ownership.rs:185:4
[INFO] [stdout]     |
[INFO] [stdout] 185 | fn test_find_first_word() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/ch04/ownership.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn first_word(s: &String) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_find_first_word_use_slice`
[INFO] [stdout]    --> src/ch04/ownership.rs:215:4
[INFO] [stdout]     |
[INFO] [stdout] 215 | fn test_find_first_word_use_slice() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word2`
[INFO] [stdout]    --> src/ch04/ownership.rs:234:4
[INFO] [stdout]     |
[INFO] [stdout] 234 | fn first_word2(s: &str) -> &str {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_slice`
[INFO] [stdout]    --> src/ch04/ownership.rs:247:4
[INFO] [stdout]     |
[INFO] [stdout] 247 | fn test_slice() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `User`
[INFO] [stdout]  --> src/ch05/struct_demo.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch05/struct_demo.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub(crate) fn main() {
[INFO] [stdout]   |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `define_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn define_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user2`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn build_user2(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `update_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn update_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tuple_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn tuple_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unit_like_struct`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn unit_like_struct() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn calculate_rectangle_area() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:117:4
[INFO] [stdout]     |
[INFO] [stdout] 117 | fn area(width: u32, height: u32) -> u32 {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:122:4
[INFO] [stdout]     |
[INFO] [stdout] 122 | fn calculate_rectangle_area2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:131:4
[INFO] [stdout]     |
[INFO] [stdout] 131 | fn area2(dimensions: (u32, u32 )) -> u32 {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area3`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:142:4
[INFO] [stdout]     |
[INFO] [stdout] 142 | fn calculate_rectangle_area3() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area3`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:152:4
[INFO] [stdout]     |
[INFO] [stdout] 152 | fn area3(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `printRect`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:156:4
[INFO] [stdout]     |
[INFO] [stdout] 156 | fn printRect() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `printRect2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:162:4
[INFO] [stdout]     |
[INFO] [stdout] 162 | fn printRect2() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn area(&self) -> u32 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:178:8
[INFO] [stdout]     |
[INFO] [stdout] 178 |     fn can_hold(&self, other:&Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:183:8
[INFO] [stdout]     |
[INFO] [stdout] 183 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_method_syntax`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:189:4
[INFO] [stdout]     |
[INFO] [stdout] 189 | fn test_method_syntax() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_associated_functions`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:206:4
[INFO] [stdout]     |
[INFO] [stdout] 206 | fn test_associated_functions() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `IpAddr`
[INFO] [stdout]  --> src/ch06/enums.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct IpAddr {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_ip_addr`
[INFO] [stdout]   --> src/ch06/enums.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn use_ip_addr() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/ch06/enums.rs:42:6
[INFO] [stdout]    |
[INFO] [stdout] 42 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `QuitMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct QuitMessage;
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `MoveMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct MoveMessage {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `WriteMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | struct WriteMessage(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ChangeColorMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | struct ChangeColorMessage(i32, i32, i32); // 元组结构体
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/ch06/enums.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_enum_method`
[INFO] [stdout]   --> src/ch06/enums.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn test_enum_method() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_Option`
[INFO] [stdout]   --> src/ch06/enums.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn test_Option() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]   --> src/ch06/enums.rs:92:6
[INFO] [stdout]    |
[INFO] [stdout] 92 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]   --> src/ch06/enums.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents2`
[INFO] [stdout]    --> src/ch06/enums.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn value_in_cents2(coin: Coin) -> u8 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]    --> src/ch06/enums.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |         Alabama,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/ch06/enums.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Alaska,
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]    --> src/ch06/enums.rs:130:21
[INFO] [stdout]     |
[INFO] [stdout] 130 |     pub(crate) enum Coin {
[INFO] [stdout]     |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]    --> src/ch06/enums.rs:138:8
[INFO] [stdout]     |
[INFO] [stdout] 138 |     fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:150:8
[INFO] [stdout]     |
[INFO] [stdout] 150 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `plus_one`
[INFO] [stdout]    --> src/ch06/enums.rs:158:8
[INFO] [stdout]     |
[INFO] [stdout] 158 |     fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:165:8
[INFO] [stdout]     |
[INFO] [stdout] 165 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 174 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:190:8
[INFO] [stdout]     |
[INFO] [stdout] 190 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_if_let`
[INFO] [stdout]    --> src/ch06/enums.rs:198:8
[INFO] [stdout]     |
[INFO] [stdout] 198 |     fn test_if_let() {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_coin1`
[INFO] [stdout]    --> src/ch06/enums.rs:205:8
[INFO] [stdout]     |
[INFO] [stdout] 205 |     fn test_coin1(coin: Patterns_that_Bind_to_Values::Coin) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_coin2`
[INFO] [stdout]    --> src/ch06/enums.rs:213:19
[INFO] [stdout]     |
[INFO] [stdout] 213 |     pub(crate) fn test_coin2(coin: Coin) {
[INFO] [stdout]     |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_to_waitlist`
[INFO] [stdout]  --> src/ch07/package_crate_module.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 |         pub fn add_to_waitlist() {}
[INFO] [stdout]   |                ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]   --> src/ch07/package_crate_module.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn eat_at_restaurant() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_to_waitlist`
[INFO] [stdout]  --> src/ch07/mod_separate/lib/front_of_house.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     pub fn add_to_waitlist() {}
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]  --> src/ch07/mod_separate/lib.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn eat_at_restaurant() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch10/generic_trait.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function1`
[INFO] [stdout]  --> src/ch10/generic_trait.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn function1() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn largest(list: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | struct Point<T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:67:12
[INFO] [stdout]    |
[INFO] [stdout] 67 |     struct Point<T, U> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:82:6
[INFO] [stdout]    |
[INFO] [stdout] 82 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:92:12
[INFO] [stdout]    |
[INFO] [stdout] 92 |     struct Point<T> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `x`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:98:12
[INFO] [stdout]    |
[INFO] [stdout] 98 |         fn x(&self) -> &T {
[INFO] [stdout]    |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:103:8
[INFO] [stdout]     |
[INFO] [stdout] 103 |     fn main() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:150:4
[INFO] [stdout]     |
[INFO] [stdout] 150 | fn test() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:188:8
[INFO] [stdout]     |
[INFO] [stdout] 188 | pub fn notify(item: impl Summary) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_summarizable`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:194:4
[INFO] [stdout]     |
[INFO] [stdout] 194 | fn returns_summarizable() -> impl Summary {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/ch13/Iterator_Closure.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn new() -> Counter {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `RustProject` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `rust_project`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `printHello` should have a snake case name
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | mod printHello;//声明printHello这个模块
[INFO] [stdout]   |     ^^^^^^^^^^ help: convert the identifier to snake case: `print_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tupleDemo` should have a snake case name
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn tupleDemo() {
[INFO] [stdout]    |    ^^^^^^^^^ help: convert the identifier to snake case: `tuple_demo`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_OwnershipandFunctions` should have a snake case name
[INFO] [stdout]   --> src/ch04/ownership.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn test_OwnershipandFunctions() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `test_ownershipand_functions`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_ReturnValuesAndScope` should have a snake case name
[INFO] [stdout]   --> src/ch04/ownership.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn test_ReturnValuesAndScope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `test_return_values_and_scope`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printRect` should have a snake case name
[INFO] [stdout]    --> src/ch05/struct_demo.rs:156:4
[INFO] [stdout]     |
[INFO] [stdout] 156 | fn printRect() {
[INFO] [stdout]     |    ^^^^^^^^^ help: convert the identifier to snake case: `print_rect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printRect2` should have a snake case name
[INFO] [stdout]    --> src/ch05/struct_demo.rs:162:4
[INFO] [stdout]     |
[INFO] [stdout] 162 | fn printRect2() {
[INFO] [stdout]     |    ^^^^^^^^^^ help: convert the identifier to snake case: `print_rect2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_Option` should have a snake case name
[INFO] [stdout]   --> src/ch06/enums.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn test_Option() {
[INFO] [stdout]    |    ^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `test_option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Patterns_that_Bind_to_Values` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:122:5
[INFO] [stdout]     |
[INFO] [stdout] 122 | mod Patterns_that_Bind_to_Values {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `patterns_that_bind_to_values`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Matching_with_Option` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:157:5
[INFO] [stdout]     |
[INFO] [stdout] 157 | mod Matching_with_Option {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `matching_with_option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `The_Placeholder` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:173:5
[INFO] [stdout]     |
[INFO] [stdout] 173 | mod The_Placeholder {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `the_placeholder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `default_Implementations` should have a snake case name
[INFO] [stdout]    --> src/ch10/generic_trait.rs:162:5
[INFO] [stdout]     |
[INFO] [stdout] 162 | mod default_Implementations {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `default_implementations`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Iterator_Closure` should have a snake case name
[INFO] [stdout]  --> src/ch13/mod.rs:1:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub mod Iterator_Closure;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator_closure`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 124 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]        Fixed src/ch10/generic_trait.rs (5 fixes)
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]    --> src/ch06/enums.rs:206:17
[INFO] [stdout]     |
[INFO] [stdout] 206 |         let mut count = 0;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06/enums.rs:209:18
[INFO] [stdout]     |
[INFO] [stdout] 209 |             _ => count += 1,
[INFO] [stdout]     |                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]    --> src/ch06/enums.rs:214:17
[INFO] [stdout]     |
[INFO] [stdout] 214 |         let mut count = 0;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06/enums.rs:218:13
[INFO] [stdout]     |
[INFO] [stdout] 218 |             count += 1;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello`
[INFO] [stdout]  --> src/hello.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn print_hello() {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello2`
[INFO] [stdout]  --> src/printHello/hello2.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn print_hello2() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_mod_hello`
[INFO] [stdout]   --> src/printHello/hello2.rs:15:19
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub(crate) fn sub_mod_hello() {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_mod2_print_hello`
[INFO] [stdout]   --> src/printHello/hello2.rs:20:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |         pub fn sub_mod2_print_hello() {
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello3`
[INFO] [stdout]  --> src/printHello/hello3.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn print_hello3() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Unsigned64`
[INFO] [stdout]   --> src/common/type_demo.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | type Unsigned64 = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `ConcreteError`
[INFO] [stdout]   --> src/common/type_demo.rs:24:10
[INFO] [stdout]    |
[INFO] [stdout] 24 |     enum ConcreteError {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]   --> src/common/type_demo.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     type Result<T> = result::Result<T, ConcreteError>;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Weight`
[INFO] [stdout]   --> src/common/type_demo.rs:50:1
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub type Weight = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `f`
[INFO] [stdout]  --> src/common/unittype.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn f() {
[INFO] [stdout]   |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `f2`
[INFO] [stdout]  --> src/common/unittype.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn f2() {
[INFO] [stdout]   |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch03/basic_concepts.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `variable`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn variable() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `variable2`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn variable2() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shadow`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn shadow() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tupleDemo`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn tupleDemo() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `another_function`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn another_function(x: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `five`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn five() -> i32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_break`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn  loop_break() {
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_while`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn test_while() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_for`
[INFO] [stdout]    --> src/ch03/basic_concepts.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn test_for() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch04/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_move`
[INFO] [stdout]   --> src/ch04/ownership.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn test_move() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_OwnershipandFunctions`
[INFO] [stdout]   --> src/ch04/ownership.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn test_OwnershipandFunctions() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]   --> src/ch04/ownership.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn takes_ownership(some_string: String) { // some_string 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `makes_copy`
[INFO] [stdout]   --> src/ch04/ownership.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn makes_copy(some_integer: i32) { // some_integer 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_ReturnValuesAndScope`
[INFO] [stdout]   --> src/ch04/ownership.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn test_ReturnValuesAndScope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gives_ownership`
[INFO] [stdout]   --> src/ch04/ownership.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn gives_ownership() -> String {                        // gives_ownership 将返回值移动给调用它的函数
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_and_gives_back`
[INFO] [stdout]   --> src/ch04/ownership.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn takes_and_gives_back(a_string: String) -> String { // a_string 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_touple`
[INFO] [stdout]    --> src/ch04/ownership.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn test_touple() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[INFO] [stdout]    --> src/ch04/ownership.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn test_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change`
[INFO] [stdout]    --> src/ch04/ownership.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn change(_some_string: &String) {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_mutable_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn test_mutable_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change2`
[INFO] [stdout]    --> src/ch04/ownership.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn change2(some_string: &mut String) {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_multi_mutable_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:157:4
[INFO] [stdout]     |
[INFO] [stdout] 157 | fn test_multi_mutable_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_multi_mutable_borrowing2`
[INFO] [stdout]    --> src/ch04/ownership.rs:170:4
[INFO] [stdout]     |
[INFO] [stdout] 170 | fn test_multi_mutable_borrowing2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_find_first_word`
[INFO] [stdout]    --> src/ch04/ownership.rs:185:4
[INFO] [stdout]     |
[INFO] [stdout] 185 | fn test_find_first_word() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/ch04/ownership.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn first_word(s: &String) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_find_first_word_use_slice`
[INFO] [stdout]    --> src/ch04/ownership.rs:215:4
[INFO] [stdout]     |
[INFO] [stdout] 215 | fn test_find_first_word_use_slice() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word2`
[INFO] [stdout]    --> src/ch04/ownership.rs:234:4
[INFO] [stdout]     |
[INFO] [stdout] 234 | fn first_word2(s: &str) -> &str {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_slice`
[INFO] [stdout]    --> src/ch04/ownership.rs:247:4
[INFO] [stdout]     |
[INFO] [stdout] 247 | fn test_slice() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `User`
[INFO] [stdout]  --> src/ch05/struct_demo.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch05/struct_demo.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub(crate) fn main() {
[INFO] [stdout]   |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `define_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn define_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user2`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn build_user2(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `update_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn update_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tuple_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn tuple_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unit_like_struct`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn unit_like_struct() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn calculate_rectangle_area() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:117:4
[INFO] [stdout]     |
[INFO] [stdout] 117 | fn area(width: u32, height: u32) -> u32 {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:122:4
[INFO] [stdout]     |
[INFO] [stdout] 122 | fn calculate_rectangle_area2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:131:4
[INFO] [stdout]     |
[INFO] [stdout] 131 | fn area2(dimensions: (u32, u32 )) -> u32 {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area3`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:142:4
[INFO] [stdout]     |
[INFO] [stdout] 142 | fn calculate_rectangle_area3() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area3`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:152:4
[INFO] [stdout]     |
[INFO] [stdout] 152 | fn area3(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `printRect`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:156:4
[INFO] [stdout]     |
[INFO] [stdout] 156 | fn printRect() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `printRect2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:162:4
[INFO] [stdout]     |
[INFO] [stdout] 162 | fn printRect2() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn area(&self) -> u32 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:178:8
[INFO] [stdout]     |
[INFO] [stdout] 178 |     fn can_hold(&self, other:&Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:183:8
[INFO] [stdout]     |
[INFO] [stdout] 183 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_method_syntax`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:189:4
[INFO] [stdout]     |
[INFO] [stdout] 189 | fn test_method_syntax() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_associated_functions`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:206:4
[INFO] [stdout]     |
[INFO] [stdout] 206 | fn test_associated_functions() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `IpAddr`
[INFO] [stdout]  --> src/ch06/enums.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct IpAddr {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_ip_addr`
[INFO] [stdout]   --> src/ch06/enums.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn use_ip_addr() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/ch06/enums.rs:42:6
[INFO] [stdout]    |
[INFO] [stdout] 42 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `QuitMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct QuitMessage;
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `MoveMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct MoveMessage {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `WriteMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | struct WriteMessage(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ChangeColorMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | struct ChangeColorMessage(i32, i32, i32); // 元组结构体
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/ch06/enums.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_enum_method`
[INFO] [stdout]   --> src/ch06/enums.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn test_enum_method() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_Option`
[INFO] [stdout]   --> src/ch06/enums.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn test_Option() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]   --> src/ch06/enums.rs:92:6
[INFO] [stdout]    |
[INFO] [stdout] 92 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]   --> src/ch06/enums.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents2`
[INFO] [stdout]    --> src/ch06/enums.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn value_in_cents2(coin: Coin) -> u8 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]    --> src/ch06/enums.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |         Alabama,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/ch06/enums.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Alaska,
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]    --> src/ch06/enums.rs:130:21
[INFO] [stdout]     |
[INFO] [stdout] 130 |     pub(crate) enum Coin {
[INFO] [stdout]     |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]    --> src/ch06/enums.rs:138:8
[INFO] [stdout]     |
[INFO] [stdout] 138 |     fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:150:8
[INFO] [stdout]     |
[INFO] [stdout] 150 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `plus_one`
[INFO] [stdout]    --> src/ch06/enums.rs:158:8
[INFO] [stdout]     |
[INFO] [stdout] 158 |     fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:165:8
[INFO] [stdout]     |
[INFO] [stdout] 165 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 174 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:190:8
[INFO] [stdout]     |
[INFO] [stdout] 190 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_if_let`
[INFO] [stdout]    --> src/ch06/enums.rs:198:8
[INFO] [stdout]     |
[INFO] [stdout] 198 |     fn test_if_let() {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_coin1`
[INFO] [stdout]    --> src/ch06/enums.rs:205:8
[INFO] [stdout]     |
[INFO] [stdout] 205 |     fn test_coin1(coin: Patterns_that_Bind_to_Values::Coin) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_coin2`
[INFO] [stdout]    --> src/ch06/enums.rs:213:19
[INFO] [stdout]     |
[INFO] [stdout] 213 |     pub(crate) fn test_coin2(coin: Coin) {
[INFO] [stdout]     |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_to_waitlist`
[INFO] [stdout]  --> src/ch07/package_crate_module.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 |         pub fn add_to_waitlist() {}
[INFO] [stdout]   |                ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]   --> src/ch07/package_crate_module.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn eat_at_restaurant() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_to_waitlist`
[INFO] [stdout]  --> src/ch07/mod_separate/lib/front_of_house.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     pub fn add_to_waitlist() {}
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]  --> src/ch07/mod_separate/lib.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn eat_at_restaurant() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch10/generic_trait.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function1`
[INFO] [stdout]  --> src/ch10/generic_trait.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn function1() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn largest(list: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     x: T,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     y: T,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         x: T,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |         y: U,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:82:6
[INFO] [stdout]    |
[INFO] [stdout] 82 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:92:12
[INFO] [stdout]    |
[INFO] [stdout] 92 |     struct Point<T> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `x`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:98:12
[INFO] [stdout]    |
[INFO] [stdout] 98 |         fn x(&self) -> &T {
[INFO] [stdout]    |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:103:8
[INFO] [stdout]     |
[INFO] [stdout] 103 |     fn main() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:150:4
[INFO] [stdout]     |
[INFO] [stdout] 150 | fn test() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:188:8
[INFO] [stdout]     |
[INFO] [stdout] 188 | pub fn notify(item: impl Summary) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_summarizable`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:194:4
[INFO] [stdout]     |
[INFO] [stdout] 194 | fn returns_summarizable() -> impl Summary {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `RustProject` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `rust_project`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `printHello` should have a snake case name
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | mod printHello;//声明printHello这个模块
[INFO] [stdout]   |     ^^^^^^^^^^ help: convert the identifier to snake case: `print_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tupleDemo` should have a snake case name
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn tupleDemo() {
[INFO] [stdout]    |    ^^^^^^^^^ help: convert the identifier to snake case: `tuple_demo`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_OwnershipandFunctions` should have a snake case name
[INFO] [stdout]   --> src/ch04/ownership.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn test_OwnershipandFunctions() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `test_ownershipand_functions`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_ReturnValuesAndScope` should have a snake case name
[INFO] [stdout]   --> src/ch04/ownership.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn test_ReturnValuesAndScope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `test_return_values_and_scope`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printRect` should have a snake case name
[INFO] [stdout]    --> src/ch05/struct_demo.rs:156:4
[INFO] [stdout]     |
[INFO] [stdout] 156 | fn printRect() {
[INFO] [stdout]     |    ^^^^^^^^^ help: convert the identifier to snake case: `print_rect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printRect2` should have a snake case name
[INFO] [stdout]    --> src/ch05/struct_demo.rs:162:4
[INFO] [stdout]     |
[INFO] [stdout] 162 | fn printRect2() {
[INFO] [stdout]     |    ^^^^^^^^^^ help: convert the identifier to snake case: `print_rect2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_Option` should have a snake case name
[INFO] [stdout]   --> src/ch06/enums.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn test_Option() {
[INFO] [stdout]    |    ^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `test_option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Patterns_that_Bind_to_Values` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:122:5
[INFO] [stdout]     |
[INFO] [stdout] 122 | mod Patterns_that_Bind_to_Values {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `patterns_that_bind_to_values`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Matching_with_Option` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:157:5
[INFO] [stdout]     |
[INFO] [stdout] 157 | mod Matching_with_Option {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `matching_with_option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `The_Placeholder` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:173:5
[INFO] [stdout]     |
[INFO] [stdout] 173 | mod The_Placeholder {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `the_placeholder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `default_Implementations` should have a snake case name
[INFO] [stdout]    --> src/ch10/generic_trait.rs:162:5
[INFO] [stdout]     |
[INFO] [stdout] 162 | mod default_Implementations {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `default_implementations`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Iterator_Closure` should have a snake case name
[INFO] [stdout]  --> src/ch13/mod.rs:1:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub mod Iterator_Closure;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator_closure`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 123 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.15s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking RustProject v0.1.0 (/tmp/fixit)
[INFO] [stdout] warning: unused macro definition
[INFO] [stdout]   --> src/bin/macro_demo.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | / macro_rules! print_hello {
[INFO] [stdout] 12 | |     ()=> {
[INFO] [stdout] 13 | |      println!("hello world！");
[INFO] [stdout] 14 | |     }
[INFO] [stdout] 15 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]    --> src/ch06/enums.rs:206:17
[INFO] [stdout]     |
[INFO] [stdout] 206 |         let mut count = 0;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06/enums.rs:209:18
[INFO] [stdout]     |
[INFO] [stdout] 209 |             _ => count += 1,
[INFO] [stdout]     |                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]    --> src/ch06/enums.rs:214:17
[INFO] [stdout]     |
[INFO] [stdout] 214 |         let mut count = 0;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06/enums.rs:218:13
[INFO] [stdout]     |
[INFO] [stdout] 218 |             count += 1;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]    --> src/ch06/enums.rs:206:17
[INFO] [stdout]     |
[INFO] [stdout] 206 |         let mut count = 0;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06/enums.rs:209:18
[INFO] [stdout]     |
[INFO] [stdout] 209 |             _ => count += 1,
[INFO] [stdout]     |                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]    --> src/ch06/enums.rs:214:17
[INFO] [stdout]     |
[INFO] [stdout] 214 |         let mut count = 0;
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]    --> src/ch06/enums.rs:218:13
[INFO] [stdout]     |
[INFO] [stdout] 218 |             count += 1;
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello`
[INFO] [stdout]  --> src/hello.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn print_hello() {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello2`
[INFO] [stdout]  --> src/printHello/hello2.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn print_hello2() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_mod_hello`
[INFO] [stdout]   --> src/printHello/hello2.rs:15:19
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub(crate) fn sub_mod_hello() {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_mod2_print_hello`
[INFO] [stdout]   --> src/printHello/hello2.rs:20:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |         pub fn sub_mod2_print_hello() {
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello3`
[INFO] [stdout]  --> src/printHello/hello3.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn print_hello3() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `unsigned_64`
[INFO] [stdout]  --> src/common/type_demo.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | type unsigned_64 = u64;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Unsigned64`
[INFO] [stdout]   --> src/common/type_demo.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | type Unsigned64 = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `ConcreteError`
[INFO] [stdout]   --> src/common/type_demo.rs:24:10
[INFO] [stdout]    |
[INFO] [stdout] 24 |     enum ConcreteError {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]   --> src/common/type_demo.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     type Result<T> = result::Result<T, ConcreteError>;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Balance`
[INFO] [stdout]   --> src/common/type_demo.rs:36:1
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub type Balance = u128;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Weight`
[INFO] [stdout]   --> src/common/type_demo.rs:50:1
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub type Weight = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `f`
[INFO] [stdout]  --> src/common/unittype.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn f() {
[INFO] [stdout]   |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `f2`
[INFO] [stdout]  --> src/common/unittype.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn f2() {
[INFO] [stdout]   |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch03/basic_concepts.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `variable`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn variable() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `variable2`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn variable2() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shadow`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn shadow() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tupleDemo`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn tupleDemo() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `another_function`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn another_function(x: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `five`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn five() -> i32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_break`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn  loop_break() {
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_while`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn test_while() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_for`
[INFO] [stdout]    --> src/ch03/basic_concepts.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn test_for() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch04/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_move`
[INFO] [stdout]   --> src/ch04/ownership.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn test_move() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_OwnershipandFunctions`
[INFO] [stdout]   --> src/ch04/ownership.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn test_OwnershipandFunctions() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]   --> src/ch04/ownership.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn takes_ownership(some_string: String) { // some_string 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `makes_copy`
[INFO] [stdout]   --> src/ch04/ownership.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn makes_copy(some_integer: i32) { // some_integer 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_ReturnValuesAndScope`
[INFO] [stdout]   --> src/ch04/ownership.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn test_ReturnValuesAndScope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gives_ownership`
[INFO] [stdout]   --> src/ch04/ownership.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn gives_ownership() -> String {                        // gives_ownership 将返回值移动给调用它的函数
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_and_gives_back`
[INFO] [stdout]   --> src/ch04/ownership.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn takes_and_gives_back(a_string: String) -> String { // a_string 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_touple`
[INFO] [stdout]    --> src/ch04/ownership.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn test_touple() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[INFO] [stdout]    --> src/ch04/ownership.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn test_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change`
[INFO] [stdout]    --> src/ch04/ownership.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn change(_some_string: &String) {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_mutable_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn test_mutable_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change2`
[INFO] [stdout]    --> src/ch04/ownership.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn change2(some_string: &mut String) {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_multi_mutable_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:157:4
[INFO] [stdout]     |
[INFO] [stdout] 157 | fn test_multi_mutable_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_multi_mutable_borrowing2`
[INFO] [stdout]    --> src/ch04/ownership.rs:170:4
[INFO] [stdout]     |
[INFO] [stdout] 170 | fn test_multi_mutable_borrowing2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_find_first_word`
[INFO] [stdout]    --> src/ch04/ownership.rs:185:4
[INFO] [stdout]     |
[INFO] [stdout] 185 | fn test_find_first_word() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/ch04/ownership.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn first_word(s: &String) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_find_first_word_use_slice`
[INFO] [stdout]    --> src/ch04/ownership.rs:215:4
[INFO] [stdout]     |
[INFO] [stdout] 215 | fn test_find_first_word_use_slice() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word2`
[INFO] [stdout]    --> src/ch04/ownership.rs:234:4
[INFO] [stdout]     |
[INFO] [stdout] 234 | fn first_word2(s: &str) -> &str {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_slice`
[INFO] [stdout]    --> src/ch04/ownership.rs:247:4
[INFO] [stdout]     |
[INFO] [stdout] 247 | fn test_slice() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `User`
[INFO] [stdout]  --> src/ch05/struct_demo.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch05/struct_demo.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub(crate) fn main() {
[INFO] [stdout]   |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `define_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn define_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user2`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn build_user2(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `update_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn update_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tuple_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn tuple_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unit_like_struct`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn unit_like_struct() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn calculate_rectangle_area() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:117:4
[INFO] [stdout]     |
[INFO] [stdout] 117 | fn area(width: u32, height: u32) -> u32 {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:122:4
[INFO] [stdout]     |
[INFO] [stdout] 122 | fn calculate_rectangle_area2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:131:4
[INFO] [stdout]     |
[INFO] [stdout] 131 | fn area2(dimensions: (u32, u32 )) -> u32 {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area3`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:142:4
[INFO] [stdout]     |
[INFO] [stdout] 142 | fn calculate_rectangle_area3() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area3`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:152:4
[INFO] [stdout]     |
[INFO] [stdout] 152 | fn area3(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `printRect`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:156:4
[INFO] [stdout]     |
[INFO] [stdout] 156 | fn printRect() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `printRect2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:162:4
[INFO] [stdout]     |
[INFO] [stdout] 162 | fn printRect2() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn area(&self) -> u32 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:178:8
[INFO] [stdout]     |
[INFO] [stdout] 178 |     fn can_hold(&self, other:&Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:183:8
[INFO] [stdout]     |
[INFO] [stdout] 183 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_method_syntax`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:189:4
[INFO] [stdout]     |
[INFO] [stdout] 189 | fn test_method_syntax() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_associated_functions`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:206:4
[INFO] [stdout]     |
[INFO] [stdout] 206 | fn test_associated_functions() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `IpAddr`
[INFO] [stdout]  --> src/ch06/enums.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct IpAddr {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_ip_addr`
[INFO] [stdout]   --> src/ch06/enums.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn use_ip_addr() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/ch06/enums.rs:42:6
[INFO] [stdout]    |
[INFO] [stdout] 42 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `QuitMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct QuitMessage;
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `MoveMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct MoveMessage {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `WriteMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | struct WriteMessage(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ChangeColorMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | struct ChangeColorMessage(i32, i32, i32); // 元组结构体
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/ch06/enums.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_enum_method`
[INFO] [stdout]   --> src/ch06/enums.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn test_enum_method() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_Option`
[INFO] [stdout]   --> src/ch06/enums.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn test_Option() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]   --> src/ch06/enums.rs:92:6
[INFO] [stdout]    |
[INFO] [stdout] 92 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]   --> src/ch06/enums.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents2`
[INFO] [stdout]    --> src/ch06/enums.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn value_in_cents2(coin: Coin) -> u8 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]    --> src/ch06/enums.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |         Alabama,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/ch06/enums.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Alaska,
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]    --> src/ch06/enums.rs:130:21
[INFO] [stdout]     |
[INFO] [stdout] 130 |     pub(crate) enum Coin {
[INFO] [stdout]     |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]    --> src/ch06/enums.rs:138:8
[INFO] [stdout]     |
[INFO] [stdout] 138 |     fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:150:8
[INFO] [stdout]     |
[INFO] [stdout] 150 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `plus_one`
[INFO] [stdout]    --> src/ch06/enums.rs:158:8
[INFO] [stdout]     |
[INFO] [stdout] 158 |     fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:165:8
[INFO] [stdout]     |
[INFO] [stdout] 165 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 174 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:190:8
[INFO] [stdout]     |
[INFO] [stdout] 190 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_if_let`
[INFO] [stdout]    --> src/ch06/enums.rs:198:8
[INFO] [stdout]     |
[INFO] [stdout] 198 |     fn test_if_let() {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_coin1`
[INFO] [stdout]    --> src/ch06/enums.rs:205:8
[INFO] [stdout]     |
[INFO] [stdout] 205 |     fn test_coin1(coin: Patterns_that_Bind_to_Values::Coin) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello`
[INFO] [stdout]  --> src/hello.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn print_hello() {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello2`
[INFO] [stdout]  --> src/printHello/hello2.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn print_hello2() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_mod_hello`
[INFO] [stdout]   --> src/printHello/hello2.rs:15:19
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub(crate) fn sub_mod_hello() {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_mod2_print_hello`
[INFO] [stdout]   --> src/printHello/hello2.rs:20:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |         pub fn sub_mod2_print_hello() {
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_hello3`
[INFO] [stdout]  --> src/printHello/hello3.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn print_hello3() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Unsigned64`
[INFO] [stdout]   --> src/common/type_demo.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | type Unsigned64 = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `ConcreteError`
[INFO] [stdout]   --> src/common/type_demo.rs:24:10
[INFO] [stdout]    |
[INFO] [stdout] 24 |     enum ConcreteError {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]   --> src/common/type_demo.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     type Result<T> = result::Result<T, ConcreteError>;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Weight`
[INFO] [stdout]   --> src/common/type_demo.rs:50:1
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub type Weight = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `f`
[INFO] [stdout]  --> src/common/unittype.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn f() {
[INFO] [stdout]   |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `f2`
[INFO] [stdout]  --> src/common/unittype.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn f2() {
[INFO] [stdout]   |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch03/basic_concepts.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `variable`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn variable() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `variable2`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn variable2() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shadow`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:37:4
[INFO] [stdout]    |
[INFO] [stdout] 37 | fn shadow() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tupleDemo`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn tupleDemo() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `another_function`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn another_function(x: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `five`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn five() -> i32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_break`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn  loop_break() {
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_while`
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn test_while() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_for`
[INFO] [stdout]    --> src/ch03/basic_concepts.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn test_for() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch04/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_move`
[INFO] [stdout]   --> src/ch04/ownership.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn test_move() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_OwnershipandFunctions`
[INFO] [stdout]   --> src/ch04/ownership.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn test_OwnershipandFunctions() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]   --> src/ch04/ownership.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn takes_ownership(some_string: String) { // some_string 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `makes_copy`
[INFO] [stdout]   --> src/ch04/ownership.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn makes_copy(some_integer: i32) { // some_integer 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_ReturnValuesAndScope`
[INFO] [stdout]   --> src/ch04/ownership.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn test_ReturnValuesAndScope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gives_ownership`
[INFO] [stdout]   --> src/ch04/ownership.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn gives_ownership() -> String {                        // gives_ownership 将返回值移动给调用它的函数
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_and_gives_back`
[INFO] [stdout]   --> src/ch04/ownership.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn takes_and_gives_back(a_string: String) -> String { // a_string 进入作用域
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_coin2`
[INFO] [stdout]    --> src/ch06/enums.rs:213:19
[INFO] [stdout]     |
[INFO] [stdout] 213 |     pub(crate) fn test_coin2(coin: Coin) {
[INFO] [stdout]     |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_to_waitlist`
[INFO] [stdout]  --> src/ch07/package_crate_module.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 |         pub fn add_to_waitlist() {}
[INFO] [stdout]   |                ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]   --> src/ch07/package_crate_module.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn eat_at_restaurant() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_to_waitlist`
[INFO] [stdout]  --> src/ch07/mod_separate/lib/front_of_house.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     pub fn add_to_waitlist() {}
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]  --> src/ch07/mod_separate/lib.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn eat_at_restaurant() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch10/generic_trait.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function1`
[INFO] [stdout]  --> src/ch10/generic_trait.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn function1() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn largest(list: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | struct Point<T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:67:12
[INFO] [stdout]    |
[INFO] [stdout] 67 |     struct Point<T, U> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:82:6
[INFO] [stdout]    |
[INFO] [stdout] 82 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:92:12
[INFO] [stdout]    |
[INFO] [stdout] 92 |     struct Point<T> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `x`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:98:12
[INFO] [stdout]    |
[INFO] [stdout] 98 |         fn x(&self) -> &T {
[INFO] [stdout]    |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:103:8
[INFO] [stdout]     |
[INFO] [stdout] 103 |     fn main() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:150:4
[INFO] [stdout]     |
[INFO] [stdout] 150 | fn test() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:188:8
[INFO] [stdout]     |
[INFO] [stdout] 188 | pub fn notify(item: impl Summary) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_summarizable`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:194:4
[INFO] [stdout]     |
[INFO] [stdout] 194 | fn returns_summarizable() -> impl Summary {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/ch13/Iterator_Closure.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn new() -> Counter {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `RustProject` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `rust_project`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `printHello` should have a snake case name
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | mod printHello;//声明printHello这个模块
[INFO] [stdout]   |     ^^^^^^^^^^ help: convert the identifier to snake case: `print_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tupleDemo` should have a snake case name
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn tupleDemo() {
[INFO] [stdout]    |    ^^^^^^^^^ help: convert the identifier to snake case: `tuple_demo`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_OwnershipandFunctions` should have a snake case name
[INFO] [stdout]   --> src/ch04/ownership.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn test_OwnershipandFunctions() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `test_ownershipand_functions`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_ReturnValuesAndScope` should have a snake case name
[INFO] [stdout]   --> src/ch04/ownership.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn test_ReturnValuesAndScope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `test_return_values_and_scope`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printRect` should have a snake case name
[INFO] [stdout]    --> src/ch05/struct_demo.rs:156:4
[INFO] [stdout]     |
[INFO] [stdout] 156 | fn printRect() {
[INFO] [stdout]     |    ^^^^^^^^^ help: convert the identifier to snake case: `print_rect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printRect2` should have a snake case name
[INFO] [stdout]    --> src/ch05/struct_demo.rs:162:4
[INFO] [stdout]     |
[INFO] [stdout] 162 | fn printRect2() {
[INFO] [stdout]     |    ^^^^^^^^^^ help: convert the identifier to snake case: `print_rect2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_Option` should have a snake case name
[INFO] [stdout]   --> src/ch06/enums.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn test_Option() {
[INFO] [stdout]    |    ^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `test_option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Patterns_that_Bind_to_Values` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:122:5
[INFO] [stdout]     |
[INFO] [stdout] 122 | mod Patterns_that_Bind_to_Values {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `patterns_that_bind_to_values`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Matching_with_Option` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:157:5
[INFO] [stdout]     |
[INFO] [stdout] 157 | mod Matching_with_Option {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `matching_with_option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_touple`
[INFO] [stdout]    --> src/ch04/ownership.rs:100:4
[INFO] [stdout]     |
[INFO] [stdout] 100 | fn test_touple() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `The_Placeholder` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:173:5
[INFO] [stdout]     |
[INFO] [stdout] 173 | mod The_Placeholder {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `the_placeholder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[INFO] [stdout]    --> src/ch04/ownership.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn test_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change`
[INFO] [stdout]    --> src/ch04/ownership.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn change(_some_string: &String) {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_mutable_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn test_mutable_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `default_Implementations` should have a snake case name
[INFO] [stdout]    --> src/ch10/generic_trait.rs:162:5
[INFO] [stdout]     |
[INFO] [stdout] 162 | mod default_Implementations {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `default_implementations`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change2`
[INFO] [stdout]    --> src/ch04/ownership.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn change2(some_string: &mut String) {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_multi_mutable_borrowing`
[INFO] [stdout]    --> src/ch04/ownership.rs:157:4
[INFO] [stdout]     |
[INFO] [stdout] 157 | fn test_multi_mutable_borrowing() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Iterator_Closure` should have a snake case name
[INFO] [stdout]  --> src/ch13/mod.rs:1:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub mod Iterator_Closure;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator_closure`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_multi_mutable_borrowing2`
[INFO] [stdout]    --> src/ch04/ownership.rs:170:4
[INFO] [stdout]     |
[INFO] [stdout] 170 | fn test_multi_mutable_borrowing2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_find_first_word`
[INFO] [stdout]    --> src/ch04/ownership.rs:185:4
[INFO] [stdout]     |
[INFO] [stdout] 185 | fn test_find_first_word() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/ch04/ownership.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn first_word(s: &String) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_find_first_word_use_slice`
[INFO] [stdout]    --> src/ch04/ownership.rs:215:4
[INFO] [stdout]     |
[INFO] [stdout] 215 | fn test_find_first_word_use_slice() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word2`
[INFO] [stdout]    --> src/ch04/ownership.rs:234:4
[INFO] [stdout]     |
[INFO] [stdout] 234 | fn first_word2(s: &str) -> &str {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_slice`
[INFO] [stdout]    --> src/ch04/ownership.rs:247:4
[INFO] [stdout]     |
[INFO] [stdout] 247 | fn test_slice() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `User`
[INFO] [stdout]  --> src/ch05/struct_demo.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch05/struct_demo.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub(crate) fn main() {
[INFO] [stdout]   |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `define_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn define_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user2`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn build_user2(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `update_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn update_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tuple_struct`
[INFO] [stdout]   --> src/ch05/struct_demo.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn tuple_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unit_like_struct`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn unit_like_struct() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn calculate_rectangle_area() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:117:4
[INFO] [stdout]     |
[INFO] [stdout] 117 | fn area(width: u32, height: u32) -> u32 {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:122:4
[INFO] [stdout]     |
[INFO] [stdout] 122 | fn calculate_rectangle_area2() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:131:4
[INFO] [stdout]     |
[INFO] [stdout] 131 | fn area2(dimensions: (u32, u32 )) -> u32 {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_rectangle_area3`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:142:4
[INFO] [stdout]     |
[INFO] [stdout] 142 | fn calculate_rectangle_area3() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area3`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:152:4
[INFO] [stdout]     |
[INFO] [stdout] 152 | fn area3(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `printRect`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:156:4
[INFO] [stdout]     |
[INFO] [stdout] 156 | fn printRect() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `printRect2`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:162:4
[INFO] [stdout]     |
[INFO] [stdout] 162 | fn printRect2() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn area(&self) -> u32 {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:178:8
[INFO] [stdout]     |
[INFO] [stdout] 178 |     fn can_hold(&self, other:&Rectangle) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:183:8
[INFO] [stdout]     |
[INFO] [stdout] 183 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_method_syntax`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:189:4
[INFO] [stdout]     |
[INFO] [stdout] 189 | fn test_method_syntax() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_associated_functions`
[INFO] [stdout]    --> src/ch05/struct_demo.rs:206:4
[INFO] [stdout]     |
[INFO] [stdout] 206 | fn test_associated_functions() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `IpAddr`
[INFO] [stdout]  --> src/ch06/enums.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct IpAddr {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_ip_addr`
[INFO] [stdout]   --> src/ch06/enums.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn use_ip_addr() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/ch06/enums.rs:42:6
[INFO] [stdout]    |
[INFO] [stdout] 42 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `QuitMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct QuitMessage;
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `MoveMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct MoveMessage {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `WriteMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | struct WriteMessage(String);
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ChangeColorMessage`
[INFO] [stdout]   --> src/ch06/enums.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | struct ChangeColorMessage(i32, i32, i32); // 元组结构体
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/ch06/enums.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_enum_method`
[INFO] [stdout]   --> src/ch06/enums.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn test_enum_method() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_Option`
[INFO] [stdout]   --> src/ch06/enums.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn test_Option() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]   --> src/ch06/enums.rs:92:6
[INFO] [stdout]    |
[INFO] [stdout] 92 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]   --> src/ch06/enums.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents2`
[INFO] [stdout]    --> src/ch06/enums.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn value_in_cents2(coin: Coin) -> u8 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]    --> src/ch06/enums.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 |         Alabama,
[INFO] [stdout]     |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]    --> src/ch06/enums.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         Alaska,
[INFO] [stdout]     |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]    --> src/ch06/enums.rs:130:21
[INFO] [stdout]     |
[INFO] [stdout] 130 |     pub(crate) enum Coin {
[INFO] [stdout]     |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]    --> src/ch06/enums.rs:138:8
[INFO] [stdout]     |
[INFO] [stdout] 138 |     fn value_in_cents(coin: Coin) -> u8 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:150:8
[INFO] [stdout]     |
[INFO] [stdout] 150 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `plus_one`
[INFO] [stdout]    --> src/ch06/enums.rs:158:8
[INFO] [stdout]     |
[INFO] [stdout] 158 |     fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:165:8
[INFO] [stdout]     |
[INFO] [stdout] 165 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 174 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch06/enums.rs:190:8
[INFO] [stdout]     |
[INFO] [stdout] 190 |     fn test() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_if_let`
[INFO] [stdout]    --> src/ch06/enums.rs:198:8
[INFO] [stdout]     |
[INFO] [stdout] 198 |     fn test_if_let() {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_coin1`
[INFO] [stdout]    --> src/ch06/enums.rs:205:8
[INFO] [stdout]     |
[INFO] [stdout] 205 |     fn test_coin1(coin: Patterns_that_Bind_to_Values::Coin) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test_coin2`
[INFO] [stdout]    --> src/ch06/enums.rs:213:19
[INFO] [stdout]     |
[INFO] [stdout] 213 |     pub(crate) fn test_coin2(coin: Coin) {
[INFO] [stdout]     |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_to_waitlist`
[INFO] [stdout]  --> src/ch07/package_crate_module.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 |         pub fn add_to_waitlist() {}
[INFO] [stdout]   |                ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]   --> src/ch07/package_crate_module.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn eat_at_restaurant() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_to_waitlist`
[INFO] [stdout]  --> src/ch07/mod_separate/lib/front_of_house.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     pub fn add_to_waitlist() {}
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_at_restaurant`
[INFO] [stdout]  --> src/ch07/mod_separate/lib.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn eat_at_restaurant() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> src/ch10/generic_trait.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function1`
[INFO] [stdout]  --> src/ch10/generic_trait.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn function1() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn largest(list: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:53:5
[INFO] [stdout]    |
[INFO] [stdout] 53 |     x: T,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     y: T,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         x: T,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |         y: U,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:82:6
[INFO] [stdout]    |
[INFO] [stdout] 82 | enum Result<T, E> {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:92:12
[INFO] [stdout]    |
[INFO] [stdout] 92 |     struct Point<T> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `x`
[INFO] [stdout]   --> src/ch10/generic_trait.rs:98:12
[INFO] [stdout]    |
[INFO] [stdout] 98 |         fn x(&self) -> &T {
[INFO] [stdout]    |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:103:8
[INFO] [stdout]     |
[INFO] [stdout] 103 |     fn main() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `test`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:150:4
[INFO] [stdout]     |
[INFO] [stdout] 150 | fn test() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `notify`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:188:8
[INFO] [stdout]     |
[INFO] [stdout] 188 | pub fn notify(item: impl Summary) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_summarizable`
[INFO] [stdout]    --> src/ch10/generic_trait.rs:194:4
[INFO] [stdout]     |
[INFO] [stdout] 194 | fn returns_summarizable() -> impl Summary {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `RustProject` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `rust_project`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `printHello` should have a snake case name
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | mod printHello;//声明printHello这个模块
[INFO] [stdout]   |     ^^^^^^^^^^ help: convert the identifier to snake case: `print_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tupleDemo` should have a snake case name
[INFO] [stdout]   --> src/ch03/basic_concepts.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn tupleDemo() {
[INFO] [stdout]    |    ^^^^^^^^^ help: convert the identifier to snake case: `tuple_demo`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_OwnershipandFunctions` should have a snake case name
[INFO] [stdout]   --> src/ch04/ownership.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn test_OwnershipandFunctions() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `test_ownershipand_functions`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_ReturnValuesAndScope` should have a snake case name
[INFO] [stdout]   --> src/ch04/ownership.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn test_ReturnValuesAndScope() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `test_return_values_and_scope`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printRect` should have a snake case name
[INFO] [stdout]    --> src/ch05/struct_demo.rs:156:4
[INFO] [stdout]     |
[INFO] [stdout] 156 | fn printRect() {
[INFO] [stdout]     |    ^^^^^^^^^ help: convert the identifier to snake case: `print_rect`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 124 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `printRect2` should have a snake case name
[INFO] [stdout]    --> src/ch05/struct_demo.rs:162:4
[INFO] [stdout]     |
[INFO] [stdout] 162 | fn printRect2() {
[INFO] [stdout]     |    ^^^^^^^^^^ help: convert the identifier to snake case: `print_rect2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_Option` should have a snake case name
[INFO] [stdout]   --> src/ch06/enums.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn test_Option() {
[INFO] [stdout]    |    ^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `test_option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Patterns_that_Bind_to_Values` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:122:5
[INFO] [stdout]     |
[INFO] [stdout] 122 | mod Patterns_that_Bind_to_Values {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `patterns_that_bind_to_values`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Matching_with_Option` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:157:5
[INFO] [stdout]     |
[INFO] [stdout] 157 | mod Matching_with_Option {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `matching_with_option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `The_Placeholder` should have a snake case name
[INFO] [stdout]    --> src/ch06/enums.rs:173:5
[INFO] [stdout]     |
[INFO] [stdout] 173 | mod The_Placeholder {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `the_placeholder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `default_Implementations` should have a snake case name
[INFO] [stdout]    --> src/ch10/generic_trait.rs:162:5
[INFO] [stdout]     |
[INFO] [stdout] 162 | mod default_Implementations {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `default_implementations`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: module `Iterator_Closure` should have a snake case name
[INFO] [stdout]  --> src/ch13/mod.rs:1:9
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub mod Iterator_Closure;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `iterator_closure`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 123 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.67s
[INFO] running `Command { std: "docker" "inspect" "28dee115f86ffc7b86d7daeea8bdbbd35b11eca613b84b7c8756bfe0622b432b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28dee115f86ffc7b86d7daeea8bdbbd35b11eca613b84b7c8756bfe0622b432b", kill_on_drop: false }`
[INFO] [stdout] 28dee115f86ffc7b86d7daeea8bdbbd35b11eca613b84b7c8756bfe0622b432b