[INFO] updating cached repository https://github.com/RevelationOfTuring/Rust-exercise
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/RevelationOfTuring/Rust-exercise
[INFO] [stderr]  * [new branch]      add-license-1 -> add-license-1
[INFO] [stderr]    35bd79b..85833a6  master        -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 85833a6e8ad2ed3365b46f1059682316bdcdc8ef
[INFO] checking RevelationOfTuring/Rust-exercise against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRevelationOfTuring%2FRust-exercise" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/RevelationOfTuring/Rust-exercise on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-3/source/Cargo.toml
[INFO] crate git repo https://github.com/RevelationOfTuring/Rust-exercise already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a1895dbc2bc1703c907c84a1892ceec0db894a5b1f3992e1d4a17738f8b0817e
[INFO] running `"docker" "start" "-a" "a1895dbc2bc1703c907c84a1892ceec0db894a5b1f3992e1d4a17738f8b0817e"`
[INFO] [stderr]     Checking rust-exercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/macro_rules/domain_specific_languages.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | / macro_rules! calculate {
[INFO] [stderr] 12 | |     (michael $e:expr) => {
[INFO] [stderr] 13 | |         {
[INFO] [stderr] 14 | |             {
[INFO] [stderr] ...  |
[INFO] [stderr] 20 | |     };
[INFO] [stderr] 21 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/macro_rules/variadic_interfaces.rs:9:1
[INFO] [stderr]    |
[INFO] [stderr] 9  | / macro_rules! calculate {
[INFO] [stderr] 10 | |     // 如果是单个参数
[INFO] [stderr] 11 | |     (michael $e:expr) => {
[INFO] [stderr] 12 | |         {
[INFO] [stderr] ...  |
[INFO] [stderr] 25 | |     }
[INFO] [stderr] 26 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `arg`
[INFO] [stderr]   --> src/generics.rs:14:25
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn generics_function<T>(arg: T) {
[INFO] [stderr]    |                         ^^^ help: if this is intentional, prefix it with an underscore: `_arg`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `private_function`
[INFO] [stderr]   --> src/module_visibility.rs:11:8
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fn private_function() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]   --> src/module_visibility.rs:16:12
[INFO] [stderr]    |
[INFO] [stderr] 16 |     pub fn function() {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `indirect_access`
[INFO] [stderr]   --> src/module_visibility.rs:21:12
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub fn indirect_access() {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]   --> src/module_visibility.rs:29:16
[INFO] [stderr]    |
[INFO] [stderr] 29 |         pub fn function() {
[INFO] [stderr]    |                ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `private_function`
[INFO] [stderr]   --> src/module_visibility.rs:34:12
[INFO] [stderr]    |
[INFO] [stderr] 34 |         fn private_function() {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `public_function_in_my_mod`
[INFO] [stderr]   --> src/module_visibility.rs:40:53
[INFO] [stderr]    |
[INFO] [stderr] 40 |         pub(in crate::module_visibility::my_mod) fn public_function_in_my_mod() {
[INFO] [stderr]    |                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `public_function_in_my_mod_inner`
[INFO] [stderr]   --> src/module_visibility.rs:47:22
[INFO] [stderr]    |
[INFO] [stderr] 47 |         pub(self) fn public_function_in_my_mod_inner() {
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `public_function_in_super_mod`
[INFO] [stderr]   --> src/module_visibility.rs:52:23
[INFO] [stderr]    |
[INFO] [stderr] 52 |         pub(super) fn public_function_in_super_mod() {
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `call_public_function_in_my_mod`
[INFO] [stderr]   --> src/module_visibility.rs:57:12
[INFO] [stderr]    |
[INFO] [stderr] 57 |     pub fn call_public_function_in_my_mod() {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `public_function_in_crate`
[INFO] [stderr]   --> src/module_visibility.rs:65:19
[INFO] [stderr]    |
[INFO] [stderr] 65 |     pub(crate) fn public_function_in_crate() {
[INFO] [stderr]    |                   ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]   --> src/module_visibility.rs:71:16
[INFO] [stderr]    |
[INFO] [stderr] 71 |         pub fn function() {
[INFO] [stderr]    |                ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]   --> src/module_visibility.rs:77:4
[INFO] [stderr]    |
[INFO] [stderr] 77 | fn function() {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `OpenBox`
[INFO] [stderr]  --> src/module_struct_visibility.rs:9:16
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub struct OpenBox<T> {
[INFO] [stderr]   |                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ClosedBox`
[INFO] [stderr]   --> src/module_struct_visibility.rs:15:16
[INFO] [stderr]    |
[INFO] [stderr] 15 |     pub struct ClosedBox<T> {
[INFO] [stderr]    |                ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/module_struct_visibility.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |         pub fn new(contents: T) -> ClosedBox<T> {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]  --> src/module_super_and_self.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn function() {
[INFO] [stderr]   |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]   --> src/module_super_and_self.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn function() {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]   --> src/module_super_and_self.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn function() {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]   --> src/module_super_and_self.rs:21:16
[INFO] [stderr]    |
[INFO] [stderr] 21 |         pub fn function() {
[INFO] [stderr]    |                ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `indirect_call`
[INFO] [stderr]   --> src/module_super_and_self.rs:26:12
[INFO] [stderr]    |
[INFO] [stderr] 26 |     pub fn indirect_call() {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `public_function`
[INFO] [stderr]  --> src/module_file_hierarchy/my_mod/inaccessible.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn public_function() {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]  --> src/module_file_hierarchy/my_mod/nested.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn function() {
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `private_function`
[INFO] [stderr]  --> src/module_file_hierarchy/my_mod/nested.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn private_function() {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]  --> src/module_file_hierarchy/my_mod/mod.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn function() {
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `private_function`
[INFO] [stderr]   --> src/module_file_hierarchy/my_mod/mod.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn private_function() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `indirect_access`
[INFO] [stderr]   --> src/module_file_hierarchy/my_mod/mod.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn indirect_access() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function`
[INFO] [stderr]   --> src/module_file_hierarchy.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn function(){
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `are_you_on_linux`
[INFO] [stderr]   --> src/attribute_cfg.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn are_you_on_linux() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generics_function`
[INFO] [stderr]   --> src/generics.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn generics_function<T>(arg: T) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `multiply_v1`
[INFO] [stderr]   --> src/error_handling_result_map.rs:30:8
[INFO] [stderr]    |
[INFO] [stderr] 30 |     fn multiply_v1(first_num_str: &str, second_num_str: &str) -> Result<i32, ParseIntError> {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print_result`
[INFO] [stderr]   --> src/error_handling_result_map.rs:46:8
[INFO] [stderr]    |
[INFO] [stderr] 46 |     fn print_result(result: Result<i32, ParseIntError>) {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `multiply_v2`
[INFO] [stderr]   --> src/error_handling_result_map.rs:71:8
[INFO] [stderr]    |
[INFO] [stderr] 71 |     fn multiply_v2(first_num_str: &str, second_num_str: &str) -> Result<i32, ParseIntError> {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Result`
[INFO] [stderr]   --> src/error_handling_multiple_error_types_boxing_errors.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `double_first`
[INFO] [stderr]   --> src/error_handling_multiple_error_types_boxing_errors.rs:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 |     fn double_first(vec: Vec<&str>) -> Result<i32> {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print_result`
[INFO] [stderr]   --> src/error_handling_multiple_error_types_boxing_errors.rs:54:8
[INFO] [stderr]    |
[INFO] [stderr] 54 |     fn print_result(result: Result<i32>) {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `create_box`
[INFO] [stderr]   --> src/scoping_rules/raii/mod.rs:14:8
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fn create_box() {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `author`
[INFO] [stderr]   --> src/scoping_rules/borrowing/mutability.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         author: &'static str,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `title`
[INFO] [stderr]   --> src/scoping_rules/borrowing/mutability.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |         title: &'static str,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `year`
[INFO] [stderr]   --> src/scoping_rules/borrowing/mutability.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         year: u32,
[INFO] [stderr]    |         ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `borrow_book`
[INFO] [stderr]   --> src/scoping_rules/borrowing/mutability.rs:20:8
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn borrow_book(book: &Book) {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `new_edition`
[INFO] [stderr]   --> src/scoping_rules/borrowing/mutability.rs:25:8
[INFO] [stderr]    |
[INFO] [stderr] 25 |     fn new_edition(book: &mut Book) {
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `NUM`
[INFO] [stderr]   --> src/lifetimes/static.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | static NUM: i32 = 1024;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `MichaelDivisionByZero`
[INFO] [stderr]   --> src/std_library_types/result.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |         MichaelDivisionByZero,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `MichaelNegativeSquareRoot`
[INFO] [stderr]   --> src/std_library_types/result.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |         MichaelNegativeSquareRoot,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `MichaelNegativeLogarithm`
[INFO] [stderr]   --> src/std_library_types/result.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |         MichaelNegativeLogarithm,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `MichaelResult`
[INFO] [stderr]   --> src/std_library_types/result.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     pub type MichaelResult = Result<f64, MichaelMathError>;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `divide`
[INFO] [stderr]   --> src/std_library_types/result.rs:33:12
[INFO] [stderr]    |
[INFO] [stderr] 33 |     pub fn divide(divident: f64, divisor: f64) -> MichaelResult {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sqrt`
[INFO] [stderr]   --> src/std_library_types/result.rs:45:12
[INFO] [stderr]    |
[INFO] [stderr] 45 |     pub fn sqrt(num: f64) -> MichaelResult {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ln`
[INFO] [stderr]   --> src/std_library_types/result.rs:56:12
[INFO] [stderr]    |
[INFO] [stderr] 56 |     pub fn ln(num: f64) -> MichaelResult {
[INFO] [stderr]    |            ^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `MichaelDivisionByZero`
[INFO] [stderr]   --> src/std_library_types/result_with_question_mark.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         MichaelDivisionByZero,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `MichaelNegativeSquareRoot`
[INFO] [stderr]   --> src/std_library_types/result_with_question_mark.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |         MichaelNegativeSquareRoot,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `MichaelNegativeLogarithm`
[INFO] [stderr]   --> src/std_library_types/result_with_question_mark.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |         MichaelNegativeLogarithm,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `MichaelResult`
[INFO] [stderr]   --> src/std_library_types/result_with_question_mark.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     type MichaelResult = Result<f64, MichaelMathError>;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `div`
[INFO] [stderr]   --> src/std_library_types/result_with_question_mark.rs:23:12
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub fn div(divident: f64, divisor: f64) -> MichaelResult {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ln`
[INFO] [stderr]   --> src/std_library_types/result_with_question_mark.rs:31:12
[INFO] [stderr]    |
[INFO] [stderr] 31 |     pub fn ln(num: f64) -> MichaelResult {
[INFO] [stderr]    |            ^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sqrt`
[INFO] [stderr]   --> src/std_library_types/result_with_question_mark.rs:39:12
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn sqrt(num: f64) -> MichaelResult {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `op`
[INFO] [stderr]   --> src/std_library_types/result_with_question_mark.rs:49:12
[INFO] [stderr]    |
[INFO] [stderr] 49 |     pub fn op(num1: f64, num2: f64) {
[INFO] [stderr]    |            ^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `run_op`
[INFO] [stderr]   --> src/std_library_types/result_with_question_mark.rs:66:8
[INFO] [stderr]    |
[INFO] [stderr] 66 |     fn run_op(num1: f64, num2: f64) -> MichaelResult {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `TEXT`
[INFO] [stderr]  --> src/file_io/create.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | static TEXT: &str = "This is a file for create test!!";
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused label
[INFO] [stderr]   --> src/labels.rs:12:13
[INFO] [stderr]    |
[INFO] [stderr] 12 |             'inner: loop {
[INFO] [stderr]    |             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 62 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error[E0606]: casting `f32` as `u8` is invalid
[INFO] [stderr]   --> src/types.rs:15:27
[INFO] [stderr]    |
[INFO] [stderr] 15 |         let integer: u8 = decimal as u8;
[INFO] [stderr]    |                           ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/file_io/open.rs:23:77
[INFO] [stderr]    |
[INFO] [stderr] 23 |             Err(err) => panic!("file {} is opened failed: {}", display, err.description()),
[INFO] [stderr]    |                                                                             ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/file_io/open.rs:30:75
[INFO] [stderr]    |
[INFO] [stderr] 30 |             Err(err) => panic!("file {} is read failed: {}", display, err.description()),
[INFO] [stderr]    |                                                                           ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> src/file_io/create.rs:27:78
[INFO] [stderr]    |
[INFO] [stderr] 27 |             Err(err) => panic!("file {} is created failed: {}", display, err.description()),
[INFO] [stderr]    |                                                                              ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0606`.
[INFO] [stderr] error: could not compile `rust-exercise`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a1895dbc2bc1703c907c84a1892ceec0db894a5b1f3992e1d4a17738f8b0817e"`
[INFO] running `"docker" "rm" "-f" "a1895dbc2bc1703c907c84a1892ceec0db894a5b1f3992e1d4a17738f8b0817e"`
[INFO] [stdout] a1895dbc2bc1703c907c84a1892ceec0db894a5b1f3992e1d4a17738f8b0817e