[INFO] updating cached repository https://github.com/abrcdf1023/rust_hello_world
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/abrcdf1023/rust_hello_world
[INFO] [stderr]    2462d7c..e29b54e  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e29b54e551096910a5da084e4a276e922866e300
[INFO] checking abrcdf1023/rust_hello_world against try#b19afc12c4f781e95f168f2fdea339c972f14ae2 for pr-64327
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabrcdf1023%2Frust_hello_world" "work/builds/worker-1/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/abrcdf1023/rust_hello_world on toolchain b19afc12c4f781e95f168f2fdea339c972f14ae2-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+b19afc12c4f781e95f168f2fdea339c972f14ae2-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/abrcdf1023/rust_hello_world
[INFO] finished tweaking git repo https://github.com/abrcdf1023/rust_hello_world
[INFO] tweaked toml for git repo https://github.com/abrcdf1023/rust_hello_world written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/abrcdf1023/rust_hello_world already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+b19afc12c4f781e95f168f2fdea339c972f14ae2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "+b19afc12c4f781e95f168f2fdea339c972f14ae2-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 18d55882c8553353ce2316b522c17ed3659d0250cdc65c1ae88f3d9d0cf53217
[INFO] running `"docker" "start" "-a" "18d55882c8553353ce2316b522c17ed3659d0250cdc65c1ae88f3d9d0cf53217"`
[INFO] [stderr]     Checking rust_hello_world v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/datatype.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/datatype.rs:48:7
[INFO] [stderr]    |
[INFO] [stderr] 48 |   let y: i64 = 30; 
[INFO] [stderr]    |       ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/datatype.rs:123:8
[INFO] [stderr]     |
[INFO] [stderr] 123 |   let (x, y, z) = tup;
[INFO] [stderr]     |        ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]    --> src/datatype.rs:123:14
[INFO] [stderr]     |
[INFO] [stderr] 123 |   let (x, y, z) = tup;
[INFO] [stderr]     |              ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/datatype.rs:145:7
[INFO] [stderr]     |
[INFO] [stderr] 145 |   let a: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stderr]     |       ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]   --> src/ownership.rs:69:7
[INFO] [stderr]    |
[INFO] [stderr] 69 |   let s1 = gives_ownership(); // gives_ownership moves its return
[INFO] [stderr]    |       ^^ help: consider prefixing with an underscore: `_s1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s3`
[INFO] [stderr]   --> src/ownership.rs:74:7
[INFO] [stderr]    |
[INFO] [stderr] 74 |   let s3 = takes_and_gives_back(s2); // s2 is moved into
[INFO] [stderr]    |       ^^ help: consider prefixing with an underscore: `_s3`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `guess_number`
[INFO] [stderr]  --> src/guess.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn guess_number() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutable`
[INFO] [stderr]   --> src/datatype.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn mutable() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `variables_shadowing`
[INFO] [stderr]   --> src/datatype.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn variables_shadowing() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types`
[INFO] [stderr]   --> src/datatype.rs:45:1
[INFO] [stderr]    |
[INFO] [stderr] 45 | pub fn data_types() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_integer`
[INFO] [stderr]   --> src/datatype.rs:53:1
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn data_types_integer() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_float`
[INFO] [stderr]   --> src/datatype.rs:65:1
[INFO] [stderr]    |
[INFO] [stderr] 65 | pub fn data_types_float() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `numeric_operations`
[INFO] [stderr]   --> src/datatype.rs:75:1
[INFO] [stderr]    |
[INFO] [stderr] 75 | pub fn numeric_operations() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_boolean`
[INFO] [stderr]   --> src/datatype.rs:94:1
[INFO] [stderr]    |
[INFO] [stderr] 94 | pub fn data_types_boolean() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_char`
[INFO] [stderr]    --> src/datatype.rs:102:1
[INFO] [stderr]     |
[INFO] [stderr] 102 | pub fn data_types_char() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compound_types`
[INFO] [stderr]    --> src/datatype.rs:119:1
[INFO] [stderr]     |
[INFO] [stderr] 119 | pub fn compound_types() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `GLOBAL_VALUE`
[INFO] [stderr]    --> src/datatype.rs:157:1
[INFO] [stderr]     |
[INFO] [stderr] 157 | const GLOBAL_VALUE: &str = "發大財";
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `CHANGABLE_GLOBAL_VALUE`
[INFO] [stderr]    --> src/datatype.rs:158:1
[INFO] [stderr]     |
[INFO] [stderr] 158 | static CHANGABLE_GLOBAL_VALUE: f64 = 10.5;
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tuple_with_mixed_data_type`
[INFO] [stderr]    --> src/datatype.rs:160:1
[INFO] [stderr]     |
[INFO] [stderr] 160 | pub fn tuple_with_mixed_data_type() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `hello_world`
[INFO] [stderr]  --> src/my_functions.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn hello_world() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `expression_based`
[INFO] [stderr]   --> src/my_functions.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn expression_based() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `statement_test`
[INFO] [stderr]   --> src/my_functions.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn statement_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]   --> src/my_functions.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | pub fn add(x: i32, y: i32) -> i32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `private_fn`
[INFO] [stderr]   --> src/my_functions.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn private_fn(x: i32, y: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mul_condition`
[INFO] [stderr]  --> src/control_flow.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn mul_condition(number: i32) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_match`
[INFO] [stderr]   --> src/control_flow.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn use_match(number: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_if_expression`
[INFO] [stderr]   --> src/control_flow.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | pub fn use_if_expression() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_to_100`
[INFO] [stderr]   --> src/control_flow.rs:36:1
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn add_to_100() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `loop_result`
[INFO] [stderr]   --> src/control_flow.rs:48:1
[INFO] [stderr]    |
[INFO] [stderr] 48 | pub fn loop_result() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `reduce_to_0`
[INFO] [stderr]   --> src/control_flow.rs:62:1
[INFO] [stderr]    |
[INFO] [stderr] 62 | pub fn reduce_to_0() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `for_in_array`
[INFO] [stderr]   --> src/control_flow.rs:70:1
[INFO] [stderr]    |
[INFO] [stderr] 70 | pub fn for_in_array() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `double_free_error`
[INFO] [stderr]  --> src/ownership.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn double_free_error() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `to_fixed_double_free_error`
[INFO] [stderr]   --> src/ownership.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn to_fixed_double_free_error() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `without_double_free_error`
[INFO] [stderr]   --> src/ownership.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub fn without_double_free_error() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ownership_and_functions`
[INFO] [stderr]   --> src/ownership.rs:38:1
[INFO] [stderr]    |
[INFO] [stderr] 38 | pub fn ownership_and_functions() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_ownership`
[INFO] [stderr]   --> src/ownership.rs:57:1
[INFO] [stderr]    |
[INFO] [stderr] 57 | fn takes_ownership(some_string: String) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `makes_copy`
[INFO] [stderr]   --> src/ownership.rs:63:1
[INFO] [stderr]    |
[INFO] [stderr] 63 | fn makes_copy(some_integer: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ownership_and_return_values`
[INFO] [stderr]   --> src/ownership.rs:68:1
[INFO] [stderr]    |
[INFO] [stderr] 68 | pub fn ownership_and_return_values() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `gives_ownership`
[INFO] [stderr]   --> src/ownership.rs:83:1
[INFO] [stderr]    |
[INFO] [stderr] 83 | fn gives_ownership() -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_and_gives_back`
[INFO] [stderr]   --> src/ownership.rs:96:1
[INFO] [stderr]    |
[INFO] [stderr] 96 | fn takes_and_gives_back(a_string: String) -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_length`
[INFO] [stderr]    --> src/ownership.rs:104:1
[INFO] [stderr]     |
[INFO] [stderr] 104 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_length`
[INFO] [stderr]  --> src/references.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn calculate_length(s: &String) -> usize { // s is a reference to a String
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `change`
[INFO] [stderr]   --> src/references.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn change(some_string: &mut String) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/datatype.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/datatype.rs:48:7
[INFO] [stderr]    |
[INFO] [stderr] 48 |   let y: i64 = 30; 
[INFO] [stderr]    |       ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/datatype.rs:123:8
[INFO] [stderr]     |
[INFO] [stderr] 123 |   let (x, y, z) = tup;
[INFO] [stderr]     |        ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]    --> src/datatype.rs:123:14
[INFO] [stderr]     |
[INFO] [stderr] 123 |   let (x, y, z) = tup;
[INFO] [stderr]     |              ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/datatype.rs:145:7
[INFO] [stderr]     |
[INFO] [stderr] 145 |   let a: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stderr]     |       ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]   --> src/ownership.rs:69:7
[INFO] [stderr]    |
[INFO] [stderr] 69 |   let s1 = gives_ownership(); // gives_ownership moves its return
[INFO] [stderr]    |       ^^ help: consider prefixing with an underscore: `_s1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s3`
[INFO] [stderr]   --> src/ownership.rs:74:7
[INFO] [stderr]    |
[INFO] [stderr] 74 |   let s3 = takes_and_gives_back(s2); // s2 is moved into
[INFO] [stderr]    |       ^^ help: consider prefixing with an underscore: `_s3`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `guess_number`
[INFO] [stderr]  --> src/guess.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn guess_number() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutable`
[INFO] [stderr]   --> src/datatype.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn mutable() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `variables_shadowing`
[INFO] [stderr]   --> src/datatype.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn variables_shadowing() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types`
[INFO] [stderr]   --> src/datatype.rs:45:1
[INFO] [stderr]    |
[INFO] [stderr] 45 | pub fn data_types() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_integer`
[INFO] [stderr]   --> src/datatype.rs:53:1
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn data_types_integer() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_float`
[INFO] [stderr]   --> src/datatype.rs:65:1
[INFO] [stderr]    |
[INFO] [stderr] 65 | pub fn data_types_float() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `numeric_operations`
[INFO] [stderr]   --> src/datatype.rs:75:1
[INFO] [stderr]    |
[INFO] [stderr] 75 | pub fn numeric_operations() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_boolean`
[INFO] [stderr]   --> src/datatype.rs:94:1
[INFO] [stderr]    |
[INFO] [stderr] 94 | pub fn data_types_boolean() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `data_types_char`
[INFO] [stderr]    --> src/datatype.rs:102:1
[INFO] [stderr]     |
[INFO] [stderr] 102 | pub fn data_types_char() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compound_types`
[INFO] [stderr]    --> src/datatype.rs:119:1
[INFO] [stderr]     |
[INFO] [stderr] 119 | pub fn compound_types() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `GLOBAL_VALUE`
[INFO] [stderr]    --> src/datatype.rs:157:1
[INFO] [stderr]     |
[INFO] [stderr] 157 | const GLOBAL_VALUE: &str = "發大財";
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `CHANGABLE_GLOBAL_VALUE`
[INFO] [stderr]    --> src/datatype.rs:158:1
[INFO] [stderr]     |
[INFO] [stderr] 158 | static CHANGABLE_GLOBAL_VALUE: f64 = 10.5;
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tuple_with_mixed_data_type`
[INFO] [stderr]    --> src/datatype.rs:160:1
[INFO] [stderr]     |
[INFO] [stderr] 160 | pub fn tuple_with_mixed_data_type() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `hello_world`
[INFO] [stderr]  --> src/my_functions.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn hello_world() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `expression_based`
[INFO] [stderr]   --> src/my_functions.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn expression_based() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `statement_test`
[INFO] [stderr]   --> src/my_functions.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn statement_test() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]   --> src/my_functions.rs:29:1
[INFO] [stderr]    |
[INFO] [stderr] 29 | pub fn add(x: i32, y: i32) -> i32 {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `private_fn`
[INFO] [stderr]   --> src/my_functions.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn private_fn(x: i32, y: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mul_condition`
[INFO] [stderr]  --> src/control_flow.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn mul_condition(number: i32) {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_match`
[INFO] [stderr]   --> src/control_flow.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn use_match(number: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_if_expression`
[INFO] [stderr]   --> src/control_flow.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | pub fn use_if_expression() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add_to_100`
[INFO] [stderr]   --> src/control_flow.rs:36:1
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn add_to_100() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `loop_result`
[INFO] [stderr]   --> src/control_flow.rs:48:1
[INFO] [stderr]    |
[INFO] [stderr] 48 | pub fn loop_result() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `reduce_to_0`
[INFO] [stderr]   --> src/control_flow.rs:62:1
[INFO] [stderr]    |
[INFO] [stderr] 62 | pub fn reduce_to_0() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `for_in_array`
[INFO] [stderr]   --> src/control_flow.rs:70:1
[INFO] [stderr]    |
[INFO] [stderr] 70 | pub fn for_in_array() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `double_free_error`
[INFO] [stderr]  --> src/ownership.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn double_free_error() {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `to_fixed_double_free_error`
[INFO] [stderr]   --> src/ownership.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn to_fixed_double_free_error() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `without_double_free_error`
[INFO] [stderr]   --> src/ownership.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub fn without_double_free_error() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ownership_and_functions`
[INFO] [stderr]   --> src/ownership.rs:38:1
[INFO] [stderr]    |
[INFO] [stderr] 38 | pub fn ownership_and_functions() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_ownership`
[INFO] [stderr]   --> src/ownership.rs:57:1
[INFO] [stderr]    |
[INFO] [stderr] 57 | fn takes_ownership(some_string: String) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `makes_copy`
[INFO] [stderr]   --> src/ownership.rs:63:1
[INFO] [stderr]    |
[INFO] [stderr] 63 | fn makes_copy(some_integer: i32) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ownership_and_return_values`
[INFO] [stderr]   --> src/ownership.rs:68:1
[INFO] [stderr]    |
[INFO] [stderr] 68 | pub fn ownership_and_return_values() {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `gives_ownership`
[INFO] [stderr]   --> src/ownership.rs:83:1
[INFO] [stderr]    |
[INFO] [stderr] 83 | fn gives_ownership() -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_and_gives_back`
[INFO] [stderr]   --> src/ownership.rs:96:1
[INFO] [stderr]    |
[INFO] [stderr] 96 | fn takes_and_gives_back(a_string: String) -> String {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_length`
[INFO] [stderr]    --> src/ownership.rs:104:1
[INFO] [stderr]     |
[INFO] [stderr] 104 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_length`
[INFO] [stderr]  --> src/references.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn calculate_length(s: &String) -> usize { // s is a reference to a String
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `change`
[INFO] [stderr]   --> src/references.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn change(some_string: &mut String) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.90s
[INFO] running `"docker" "inspect" "18d55882c8553353ce2316b522c17ed3659d0250cdc65c1ae88f3d9d0cf53217"`
[INFO] running `"docker" "rm" "-f" "18d55882c8553353ce2316b522c17ed3659d0250cdc65c1ae88f3d9d0cf53217"`
[INFO] [stdout] 18d55882c8553353ce2316b522c17ed3659d0250cdc65c1ae88f3d9d0cf53217