[INFO] cloning repository https://github.com/RevelationOfTuring/Rust-exercise
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/RevelationOfTuring/Rust-exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRevelationOfTuring%2FRust-exercise", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRevelationOfTuring%2FRust-exercise'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 85833a6e8ad2ed3365b46f1059682316bdcdc8ef
[INFO] checking RevelationOfTuring/Rust-exercise/85833a6e8ad2ed3365b46f1059682316bdcdc8ef against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRevelationOfTuring%2FRust-exercise" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/RevelationOfTuring/Rust-exercise on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/RevelationOfTuring/Rust-exercise
[INFO] finished tweaking git repo https://github.com/RevelationOfTuring/Rust-exercise
[INFO] tweaked toml for git repo https://github.com/RevelationOfTuring/Rust-exercise written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/RevelationOfTuring/Rust-exercise already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2a9260a2ab240e07ae9b614a078750bfda30b9fb9b46d8490bc5c8694ea89442
[INFO] running `Command { std: "docker" "start" "-a" "2a9260a2ab240e07ae9b614a078750bfda30b9fb9b46d8490bc5c8694ea89442", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a9260a2ab240e07ae9b614a078750bfda30b9fb9b46d8490bc5c8694ea89442", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a9260a2ab240e07ae9b614a078750bfda30b9fb9b46d8490bc5c8694ea89442", kill_on_drop: false }`
[INFO] [stdout] 2a9260a2ab240e07ae9b614a078750bfda30b9fb9b46d8490bc5c8694ea89442
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f0353b5c7a4a36c06929e8040e7f7af310416ace08458eb45ec4b3fc31ae571e
[INFO] running `Command { std: "docker" "start" "-a" "f0353b5c7a4a36c06929e8040e7f7af310416ace08458eb45ec4b3fc31ae571e", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-exercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused macro definition: `calculate`
[INFO] [stdout]   --> src/macro_rules/domain_specific_languages.rs:11:14
[INFO] [stdout]    |
[INFO] [stdout] 11 | macro_rules! calculate {
[INFO] [stdout]    |              ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `calculate`
[INFO] [stdout]  --> src/macro_rules/variadic_interfaces.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 | macro_rules! calculate {
[INFO] [stdout]   |              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arg`
[INFO] [stdout]   --> src/generics.rs:14:25
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn generics_function<T>(arg: T) {
[INFO] [stdout]    |                         ^^^ help: if this is intentional, prefix it with an underscore: `_arg`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/labels.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |             'inner: loop {
[INFO] [stdout]    |             ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trailing semicolon in macro used in expression position
[INFO] [stdout]   --> src/macro_rules/dont_repeat_yourself.rs:23:33
[INFO] [stdout]    |
[INFO] [stdout] 23 |                     ($b.len(),));
[INFO] [stdout]    |                                 ^
[INFO] [stdout] ...
[INFO] [stdout] 35 |         assert_equal_len!(a,b,hi,+=)
[INFO] [stdout]    |         ---------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #79813 <https://github.com/rust-lang/rust/issues/79813>
[INFO] [stdout]    = note: macro invocations at the end of a block are treated as expressions
[INFO] [stdout]    = note: to ignore the value produced by the macro, add a semicolon after the invocation of `assert_equal_len`
[INFO] [stdout]    = note: `#[warn(semicolon_in_expressions_from_macros)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `assert_equal_len` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/module_visibility.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn function() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot test inner items
[INFO] [stdout]   --> src/macro_rules/dont_repeat_yourself.rs:65:17
[INFO] [stdout]    |
[INFO] [stdout] 65 |                 #[test]
[INFO] [stdout]    |                 ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 85 |         test_michael!(add_michael,1,2,3);
[INFO] [stdout]    |         -------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unnameable_test_items)]` on by default
[INFO] [stdout]    = note: this warning originates in the attribute macro `test` which comes from the expansion of the macro `test_michael` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `private_function` is never used
[INFO] [stdout]   --> src/module_visibility.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn private_function() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/module_visibility.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 |     pub fn function() {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot test inner items
[INFO] [stdout]   --> src/macro_rules/dont_repeat_yourself.rs:65:17
[INFO] [stdout]    |
[INFO] [stdout] 65 |                 #[test]
[INFO] [stdout]    |                 ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 86 |         test_michael!(mul_michael,4,5,20);
[INFO] [stdout]    |         --------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the attribute macro `test` which comes from the expansion of the macro `test_michael` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `indirect_access` is never used
[INFO] [stdout]   --> src/module_visibility.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 |     pub fn indirect_access() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `call_public_function_in_my_mod` is never used
[INFO] [stdout]   --> src/module_visibility.rs:57:12
[INFO] [stdout]    |
[INFO] [stdout] 57 |     pub fn call_public_function_in_my_mod() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot test inner items
[INFO] [stdout]   --> src/macro_rules/dont_repeat_yourself.rs:65:17
[INFO] [stdout]    |
[INFO] [stdout] 65 |                 #[test]
[INFO] [stdout]    |                 ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 87 |         test_michael!(sub_michael,3,2,1);
[INFO] [stdout]    |         -------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the attribute macro `test` which comes from the expansion of the macro `test_michael` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `public_function_in_crate` is never used
[INFO] [stdout]   --> src/module_visibility.rs:65:19
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub(crate) fn public_function_in_crate() {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/module_visibility.rs:29:16
[INFO] [stdout]    |
[INFO] [stdout] 29 |         pub fn function() {
[INFO] [stdout]    |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `private_function` is never used
[INFO] [stdout]   --> src/module_visibility.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |         fn private_function() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `public_function_in_my_mod` is never used
[INFO] [stdout]   --> src/module_visibility.rs:40:53
[INFO] [stdout]    |
[INFO] [stdout] 40 |         pub(in crate::module_visibility::my_mod) fn public_function_in_my_mod() {
[INFO] [stdout]    |                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `public_function_in_my_mod_inner` is never used
[INFO] [stdout]   --> src/module_visibility.rs:47:22
[INFO] [stdout]    |
[INFO] [stdout] 47 |         pub(self) fn public_function_in_my_mod_inner() {
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `public_function_in_super_mod` is never used
[INFO] [stdout]   --> src/module_visibility.rs:52:23
[INFO] [stdout]    |
[INFO] [stdout] 52 |         pub(super) fn public_function_in_super_mod() {
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/module_visibility.rs:71:16
[INFO] [stdout]    |
[INFO] [stdout] 71 |         pub fn function() {
[INFO] [stdout]    |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OpenBox` is never constructed
[INFO] [stdout]  --> src/module_struct_visibility.rs:9:16
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub struct OpenBox<T> {
[INFO] [stdout]   |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ClosedBox` is never constructed
[INFO] [stdout]   --> src/module_struct_visibility.rs:15:16
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub struct ClosedBox<T> {
[INFO] [stdout]    |                ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/module_struct_visibility.rs:22:16
[INFO] [stdout]    |
[INFO] [stdout] 20 |     impl<T> ClosedBox<T> {
[INFO] [stdout]    |     -------------------- associated function in this implementation
[INFO] [stdout] 21 |         // 一个公有的构造器方法
[INFO] [stdout] 22 |         pub fn new(contents: T) -> ClosedBox<T> {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]  --> src/module_super_and_self.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn function() {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/module_super_and_self.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn function() {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/module_super_and_self.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn function() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `indirect_call` is never used
[INFO] [stdout]   --> src/module_super_and_self.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn indirect_call() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/module_super_and_self.rs:21:16
[INFO] [stdout]    |
[INFO] [stdout] 21 |         pub fn function() {
[INFO] [stdout]    |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/module_file_hierarchy.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn function(){
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]  --> src/module_file_hierarchy/my_mod/mod.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn function() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `private_function` is never used
[INFO] [stdout]   --> src/module_file_hierarchy/my_mod/mod.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn private_function() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `indirect_access` is never used
[INFO] [stdout]   --> src/module_file_hierarchy/my_mod/mod.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn indirect_access() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `public_function` is never used
[INFO] [stdout]  --> src/module_file_hierarchy/my_mod/inaccessible.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn public_function() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]  --> src/module_file_hierarchy/my_mod/nested.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn function() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `private_function` is never used
[INFO] [stdout]  --> src/module_file_hierarchy/my_mod/nested.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn private_function() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `are_you_on_linux` is never used
[INFO] [stdout]   --> src/attribute_cfg.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn are_you_on_linux() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generics_function` is never used
[INFO] [stdout]   --> src/generics.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn generics_function<T>(arg: T) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multiply_v1` is never used
[INFO] [stdout]   --> src/error_handling_result_map.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn multiply_v1(first_num_str: &str, second_num_str: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_result` is never used
[INFO] [stdout]   --> src/error_handling_result_map.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn print_result(result: Result<i32, ParseIntError>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `multiply_v2` is never used
[INFO] [stdout]   --> src/error_handling_result_map.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 |     fn multiply_v2(first_num_str: &str, second_num_str: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Result` is never used
[INFO] [stdout]   --> src/error_handling_multiple_error_types_boxing_errors.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 |     type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `EmptyVec` is never constructed
[INFO] [stdout]   --> src/error_handling_multiple_error_types_boxing_errors.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |     struct EmptyVec;
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `double_first` is never used
[INFO] [stdout]   --> src/error_handling_multiple_error_types_boxing_errors.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn double_first(vec: Vec<&str>) -> Result<i32> {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_result` is never used
[INFO] [stdout]   --> src/error_handling_multiple_error_types_boxing_errors.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn print_result(result: Result<i32>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Bird` is never used
[INFO] [stdout]   --> src/trait_object.rs:26:7
[INFO] [stdout]    |
[INFO] [stdout] 26 | trait Bird {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Duck` is never constructed
[INFO] [stdout]   --> src/trait_object.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | struct Duck;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Swan` is never constructed
[INFO] [stdout]   --> src/trait_object.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | struct Swan;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_box` is never used
[INFO] [stdout]   --> src/scoping_rules/raii/mod.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn create_box() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Book` is never constructed
[INFO] [stdout]   --> src/scoping_rules/borrowing/mutability.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |     struct Book {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `borrow_book` is never used
[INFO] [stdout]   --> src/scoping_rules/borrowing/mutability.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn borrow_book(book: &Book) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `new_edition` is never used
[INFO] [stdout]   --> src/scoping_rules/borrowing/mutability.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn new_edition(book: &mut Book) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `NUM` is never used
[INFO] [stdout]   --> src/lifetimes/static.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | static NUM: i32 = 1024;
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MichaelMathError` is never used
[INFO] [stdout]   --> src/std_library_types/result.rs:18:14
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub enum MichaelMathError {
[INFO] [stdout]    |              ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MichaelMathError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `MichaelResult` is never used
[INFO] [stdout]   --> src/std_library_types/result.rs:29:14
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub type MichaelResult = Result<f64, MichaelMathError>;
[INFO] [stdout]    |              ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `divide` is never used
[INFO] [stdout]   --> src/std_library_types/result.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 |     pub fn divide(divident: f64, divisor: f64) -> MichaelResult {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sqrt` is never used
[INFO] [stdout]   --> src/std_library_types/result.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn sqrt(num: f64) -> MichaelResult {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ln` is never used
[INFO] [stdout]   --> src/std_library_types/result.rs:56:12
[INFO] [stdout]    |
[INFO] [stdout] 56 |     pub fn ln(num: f64) -> MichaelResult {
[INFO] [stdout]    |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MichaelMathError` is never used
[INFO] [stdout]   --> src/std_library_types/result_with_question_mark.rs:15:14
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub enum MichaelMathError {
[INFO] [stdout]    |              ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MichaelMathError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `MichaelResult` is never used
[INFO] [stdout]   --> src/std_library_types/result_with_question_mark.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 |     type MichaelResult = Result<f64, MichaelMathError>;
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `div` is never used
[INFO] [stdout]   --> src/std_library_types/result_with_question_mark.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn div(divident: f64, divisor: f64) -> MichaelResult {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ln` is never used
[INFO] [stdout]   --> src/std_library_types/result_with_question_mark.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn ln(num: f64) -> MichaelResult {
[INFO] [stdout]    |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sqrt` is never used
[INFO] [stdout]   --> src/std_library_types/result_with_question_mark.rs:39:12
[INFO] [stdout]    |
[INFO] [stdout] 39 |     pub fn sqrt(num: f64) -> MichaelResult {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `op` is never used
[INFO] [stdout]   --> src/std_library_types/result_with_question_mark.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn op(num1: f64, num2: f64) {
[INFO] [stdout]    |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_op` is never used
[INFO] [stdout]   --> src/std_library_types/result_with_question_mark.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn run_op(num1: f64, num2: f64) -> MichaelResult {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `TEXT` is never used
[INFO] [stdout]  --> src/file_io/create.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | static TEXT: &str = "This is a file for create test!!";
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 60 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/file_io/open.rs:23:77
[INFO] [stdout]    |
[INFO] [stdout] 23 |             Err(err) => panic!("file {} is opened failed: {}", display, err.description()),
[INFO] [stdout]    |                                                                             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/file_io/open.rs:30:75
[INFO] [stdout]    |
[INFO] [stdout] 30 |             Err(err) => panic!("file {} is read failed: {}", display, err.description()),
[INFO] [stdout]    |                                                                           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/file_io/create.rs:27:78
[INFO] [stdout]    |
[INFO] [stdout] 27 |             Err(err) => panic!("file {} is created failed: {}", display, err.description()),
[INFO] [stdout]    |                                                                              ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `noisy_unused_variable`
[INFO] [stdout]   --> src/variable_bindings.rs:23:13
[INFO] [stdout]    |
[INFO] [stdout] 23 |         let noisy_unused_variable = 2u32;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_noisy_unused_variable`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `closure_annotated`
[INFO] [stdout]   --> src/function_closures.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let closure_annotated = |i: i32| -> i32 { i + 1 };
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closure_annotated`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reborrow`
[INFO] [stdout]   --> src/function_closures_capturing.rs:48:13
[INFO] [stdout]    |
[INFO] [stdout] 48 |         let reborrow = &mut count;
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reborrow`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/function_diverging_functions.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |         let a = some_fn();
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arg`
[INFO] [stdout]   --> src/generics.rs:14:25
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn generics_function<T>(arg: T) {
[INFO] [stdout]    |                         ^^^ help: if this is intentional, prefix it with an underscore: `_arg`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/object_safe.rs:103:17
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let mut x = 1024;
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/object_safe.rs:103:13
[INFO] [stdout]     |
[INFO] [stdout] 103 |         let mut x = 1024;
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `foo2`
[INFO] [stdout]    --> src/object_safe.rs:157:17
[INFO] [stdout]     |
[INFO] [stdout] 157 |         let mut foo2 = Foo2(1024);
[INFO] [stdout]     |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_foo2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/object_safe.rs:157:13
[INFO] [stdout]     |
[INFO] [stdout] 157 |         let mut foo2 = Foo2(1024);
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/scoping_rules/raii/destructor.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let x = S;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/lifetimes/explicit_annotation.rs:36:13
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let x = 1024;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `test3`
[INFO] [stdout]   --> src/traits/derive.rs:41:13
[INFO] [stdout]    |
[INFO] [stdout] 41 |         let test3 = Test3(1024);
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_test3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rhs`
[INFO] [stdout]   --> src/traits/operator_overloading.rs:36:22
[INFO] [stdout]    |
[INFO] [stdout] 36 |         fn add(self, rhs: Test1) -> Self::Output {
[INFO] [stdout]    |                      ^^^ help: if this is intentional, prefix it with an underscore: `_rhs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rhs`
[INFO] [stdout]   --> src/traits/operator_overloading.rs:48:22
[INFO] [stdout]    |
[INFO] [stdout] 48 |         fn add(self, rhs: Test2) -> Self::Output {
[INFO] [stdout]    |                      ^^^ help: if this is intentional, prefix it with an underscore: `_rhs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `test2`
[INFO] [stdout]   --> src/traits/drop.rs:29:17
[INFO] [stdout]    |
[INFO] [stdout] 29 |             let test2 = Test { name: "test2" };
[INFO] [stdout]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_test2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `test3`
[INFO] [stdout]   --> src/traits/drop.rs:32:21
[INFO] [stdout]    |
[INFO] [stdout] 32 |                 let test3 = Test { name: "test3" };
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_test3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `test4`
[INFO] [stdout]   --> src/traits/drop.rs:33:21
[INFO] [stdout]    |
[INFO] [stdout] 33 |                 let test4 = Test { name: "test4" };
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_test4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/std_library_types/hashset.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let mut set2: HashSet<i32> = vec![3, 4, 5, 6, 7, 8].into_iter().collect();
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]   --> src/conversion.rs:28:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |         struct Number {
[INFO] [stdout]    |                ------ field in this struct
[INFO] [stdout] 28 |             value: i32,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Number` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/tuples.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     struct Person<'a> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]  --> src/structures.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     struct Point {
[INFO] [stdout]   |            ----- fields in this struct
[INFO] [stdout] 5 |         x: f32,
[INFO] [stdout]   |         ^
[INFO] [stdout] 6 |         y: f32,
[INFO] [stdout]   |         ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `field2` and `field3` are never read
[INFO] [stdout]  --> src/destructure_struct.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     struct S1 {
[INFO] [stdout]   |            -- fields in this struct
[INFO] [stdout] 7 |         field1: i32,
[INFO] [stdout] 8 |         field2: String,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout] 9 |         field3: (u32, f64),
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `S1` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]  --> src/function_diverging_functions.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |         fn foo() -> ! {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `private_function` is never used
[INFO] [stdout]   --> src/module_visibility.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |         fn private_function() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/module_visibility.rs:71:16
[INFO] [stdout]    |
[INFO] [stdout] 71 |         pub fn function() {
[INFO] [stdout]    |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `contents` is never read
[INFO] [stdout]   --> src/module_struct_visibility.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub struct ClosedBox<T> {
[INFO] [stdout]    |                --------- field in this struct
[INFO] [stdout] 16 |         // 私有字段
[INFO] [stdout] 17 |         contents: T,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `public_function` is never used
[INFO] [stdout]  --> src/module_file_hierarchy/my_mod/inaccessible.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn public_function() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `private_function` is never used
[INFO] [stdout]  --> src/module_file_hierarchy/my_mod/nested.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn private_function() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `unused_function` is never used
[INFO] [stdout]   --> src/attribute_dead_code.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn unused_function() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generics_function` is never used
[INFO] [stdout]   --> src/generics.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn generics_function<T>(arg: T) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `A` is never constructed
[INFO] [stdout]   --> src/generics_trait.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     struct A {
[INFO] [stdout]    |            ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Turkey` is never constructed
[INFO] [stdout]   --> src/generics_empty_bounds.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |     struct Turkey;
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `number` is never read
[INFO] [stdout]   --> src/error_handling_unpacking_options_with_question_mark.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     struct PhoneNumber {
[INFO] [stdout]    |            ----------- field in this struct
[INFO] [stdout] 44 |         area_code: Option<u8>,
[INFO] [stdout] 45 |         number: u32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PhoneNumber` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/error_handling_option_and_unwrap_combinator_map.rs:27:19
[INFO] [stdout]    |
[INFO] [stdout] 27 |     struct Cooked(Food);
[INFO] [stdout]    |            ------ ^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `Cooked` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Double` is never used
[INFO] [stdout]   --> src/object_safe.rs:90:11
[INFO] [stdout]    |
[INFO] [stdout] 90 |     trait Double {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/object_safe.rs:116:12
[INFO] [stdout]     |
[INFO] [stdout] 115 |     trait Double1 {
[INFO] [stdout]     |           ------- associated function in this trait
[INFO] [stdout] 116 |         fn new() -> Self where Self: Sized;
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `double` is never used
[INFO] [stdout]    --> src/object_safe.rs:142:12
[INFO] [stdout]     |
[INFO] [stdout] 139 |     trait Double2 {
[INFO] [stdout]     |           ------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 142 |         fn double(&mut self);
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/object_safe.rs:145:17
[INFO] [stdout]     |
[INFO] [stdout] 145 |     struct Foo2(i32);
[INFO] [stdout]     |            ---- ^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/lifetimes/structs.rs:13:25
[INFO] [stdout]    |
[INFO] [stdout] 13 |     struct Borrowed<'a>(&'a i32);
[INFO] [stdout]    |            --------     ^^^^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `Borrowed` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/lifetimes/structs.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     struct NameBorrowed<'a> {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 18 |         x: &'a i32,
[INFO] [stdout]    |         ^
[INFO] [stdout] 19 |         y: &'a i32,
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `NameBorrowed` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/lifetimes/structs.rs:25:13
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Num(i32),
[INFO] [stdout]    |         --- ^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Either` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Num(()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/lifetimes/structs.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 |         Ref(&'a i32),
[INFO] [stdout]    |         --- ^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Either` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 26 |         Ref(()),
[INFO] [stdout]    |             ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]   --> src/lifetimes/traits.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     struct S<'a> {
[INFO] [stdout]    |            - field in this struct
[INFO] [stdout] 13 |         name: &'a str
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `S` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/lifetimes/bounds.rs:17:27
[INFO] [stdout]    |
[INFO] [stdout] 17 |     struct Ref<'a, T: 'a>(&'a T);
[INFO] [stdout]    |            ---            ^^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `Ref` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/traits/derive.rs:37:18
[INFO] [stdout]    |
[INFO] [stdout] 37 |     struct Test3(i32);
[INFO] [stdout]    |            ----- ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/traits/clone.rs:18:21
[INFO] [stdout]    |
[INFO] [stdout] 18 |     struct Pair<'a>(Box<f64>, &'a str);
[INFO] [stdout]    |            ----     ^^^^^^^^  ^^^^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout]    = note: `Pair` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/std_library_types/box_stack_heap.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     struct Test1 {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 15 |         x: f32,
[INFO] [stdout]    |         ^
[INFO] [stdout] 16 |         y: f64,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `field1` and `field2` are never read
[INFO] [stdout]   --> src/std_library_types/box_stack_heap.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     struct Test2 {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 21 |         field1: Test1,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 22 |         field2: Test1,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_michael` is never used
[INFO] [stdout]   --> src/macro_rules/dont_repeat_yourself.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     op!(add_michael,Add,+=,add);    // Add是一个trait，add是该trait中的方法名
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mul_michael` is never used
[INFO] [stdout]   --> src/macro_rules/dont_repeat_yourself.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     op!(mul_michael,Mul,*=,mul);
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sub_michael` is never used
[INFO] [stdout]   --> src/macro_rules/dont_repeat_yourself.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     op!(sub_michael,Sub,-=,sub);
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_michael` is never used
[INFO] [stdout]   --> src/macro_rules/dont_repeat_yourself.rs:85:23
[INFO] [stdout]    |
[INFO] [stdout] 85 |         test_michael!(add_michael,1,2,3);
[INFO] [stdout]    |                       ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `test_michael` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mul_michael` is never used
[INFO] [stdout]   --> src/macro_rules/dont_repeat_yourself.rs:86:23
[INFO] [stdout]    |
[INFO] [stdout] 86 |         test_michael!(mul_michael,4,5,20);
[INFO] [stdout]    |                       ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `test_michael` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sub_michael` is never used
[INFO] [stdout]   --> src/macro_rules/dont_repeat_yourself.rs:87:23
[INFO] [stdout]    |
[INFO] [stdout] 87 |         test_michael!(sub_michael,3,2,1);
[INFO] [stdout]    |                       ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `test_michael` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_ToString_and_FromStr` should have a snake case name
[INFO] [stdout]   --> src/conversion.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 |     fn test_ToString_and_FromStr() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `test_to_string_and_from_str`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/function_closures_examples_in_std.rs:45:31
[INFO] [stdout]    |
[INFO] [stdout] 45 |         println!("{}", array2.into_iter().any(|&x| x == 2));
[INFO] [stdout]    |                               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout]    = note: `#[warn(array_into_iter)]` on by default
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 45 |         println!("{}", array2.iter().any(|&x| x == 2));
[INFO] [stdout]    |                               ~~~~
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 45 |         println!("{}", IntoIterator::into_iter(array2).any(|&x| x == 2));
[INFO] [stdout]    |                        ++++++++++++++++++++++++      ~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/function_closures_examples_in_std.rs:88:33
[INFO] [stdout]    |
[INFO] [stdout] 88 |         println!("{:?}", array2.into_iter().find(|&&x| x == 2));
[INFO] [stdout]    |                                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 88 |         println!("{:?}", array2.iter().find(|&&x| x == 2));
[INFO] [stdout]    |                                 ~~~~
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 88 |         println!("{:?}", IntoIterator::into_iter(array2).find(|&&x| x == 2));
[INFO] [stdout]    |                          ++++++++++++++++++++++++      ~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::str::from_utf8` with a invalid literal always return an error
[INFO] [stdout]    --> src/std_library_types/string_literals_and_escapes.rs:118:15
[INFO] [stdout]     |
[INFO] [stdout] 115 |         let byte_string_not_uft8 = b"\x82\xe6\x82\xa8\x82\xb1\x82";
[INFO] [stdout]     |                                    ------------------------------- the literal was valid UTF-8 up to the 0 bytes
[INFO] [stdout] ...
[INFO] [stdout] 118 |         match std::str::from_utf8(byte_string_not_uft8) {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(invalid_from_utf8)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 66 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.63s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rust-exercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 3`
[INFO] running `Command { std: "docker" "inspect" "f0353b5c7a4a36c06929e8040e7f7af310416ace08458eb45ec4b3fc31ae571e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0353b5c7a4a36c06929e8040e7f7af310416ace08458eb45ec4b3fc31ae571e", kill_on_drop: false }`
[INFO] [stdout] f0353b5c7a4a36c06929e8040e7f7af310416ace08458eb45ec4b3fc31ae571e