[INFO] updating cached repository https://github.com/abrcdf1023/rust_hello_world
[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] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2254a2b443298ef766ba98848542044429daaba8
[INFO] checking abrcdf1023/rust_hello_world against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabrcdf1023%2Frust_hello_world" "/workspace/builds/worker-12/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/abrcdf1023/rust_hello_world 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/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 /workspace/builds/worker-12/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 `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 42dc63213424613dc0f50dcb180d7f72ff6ab3dfd81e36609688b73b3bbc60a5
[INFO] running `"docker" "start" "-a" "42dc63213424613dc0f50dcb180d7f72ff6ab3dfd81e36609688b73b3bbc60a5"`
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking rand v0.3.23
[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 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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]  --> src/ownership.rs:3:7
[INFO] [stderr]   |
[INFO] [stderr] 3 |   let y = x;
[INFO] [stderr]   |       ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s2`
[INFO] [stderr]  --> src/ownership.rs:6:7
[INFO] [stderr]   |
[INFO] [stderr] 6 |   let s2 = s1;
[INFO] [stderr]   |       ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]   --> src/ownership.rs:72:7
[INFO] [stderr]    |
[INFO] [stderr] 72 |   let s1 = gives_ownership(); // gives_ownership moves its return
[INFO] [stderr]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/references.rs:81:11
[INFO] [stderr]    |
[INFO] [stderr] 81 |       let r1 = &mut s;
[INFO] [stderr]    |           ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]   --> src/references.rs:85:7
[INFO] [stderr]    |
[INFO] [stderr] 85 |   let r2 = &mut s;
[INFO] [stderr]    |       ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[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: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `guess_number`
[INFO] [stderr]  --> src/guess.rs:5:8
[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: unused variable: `x`
[INFO] [stderr]    --> src/datatype.rs:123:8
[INFO] [stderr]     |
[INFO] [stderr] 123 |   let (x, y, z) = tup;
[INFO] [stderr]     |        ^ help: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]  --> src/ownership.rs:3:7
[INFO] [stderr]   |
[INFO] [stderr] 3 |   let y = x;
[INFO] [stderr]   |       ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s2`
[INFO] [stderr]  --> src/ownership.rs:6:7
[INFO] [stderr]   |
[INFO] [stderr] 6 |   let s2 = s1;
[INFO] [stderr]   |       ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]   --> src/ownership.rs:72:7
[INFO] [stderr]    |
[INFO] [stderr] 72 |   let s1 = gives_ownership(); // gives_ownership moves its return
[INFO] [stderr]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/references.rs:81:11
[INFO] [stderr]    |
[INFO] [stderr] 81 |       let r1 = &mut s;
[INFO] [stderr]    |           ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]   --> src/references.rs:85:7
[INFO] [stderr]    |
[INFO] [stderr] 85 |   let r2 = &mut s;
[INFO] [stderr]    |       ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutable`
[INFO] [stderr]   --> src/datatype.rs:11:8
[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:24:8
[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:45:8
[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:53:8
[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:65:8
[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:75:8
[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:94:8
[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:102:8
[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:119:8
[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:160:8
[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:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn hello_world() {
[INFO] [stderr]   |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fn_with_parameters`
[INFO] [stderr]  --> src/my_functions.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn fn_with_parameters(x: i32, y: i32) {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `expression_based`
[INFO] [stderr]   --> src/my_functions.rs:10:8
[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:19:8
[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:29:8
[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:33:4
[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:3:8
[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:15:8
[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:25:8
[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:36:8
[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:48:8
[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:62:8
[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:70:8
[INFO] [stderr]    |
[INFO] [stderr] 70 | pub fn for_in_array() {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `move_vs_copy`
[INFO] [stderr]  --> src/ownership.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn move_vs_copy() {
[INFO] [stderr]   |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `double_free_error`
[INFO] [stderr]   --> src/ownership.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | 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:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 | 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:39:8
[INFO] [stderr]    |
[INFO] [stderr] 39 | 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:47:8
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub fn ownership_and_functions() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_ownership`
[INFO] [stderr]   --> src/ownership.rs:63:4
[INFO] [stderr]    |
[INFO] [stderr] 63 | fn takes_ownership(some_string: String) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `makes_copy`
[INFO] [stderr]   --> src/ownership.rs:67:4
[INFO] [stderr]    |
[INFO] [stderr] 67 | 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:71:8
[INFO] [stderr]    |
[INFO] [stderr] 71 | pub fn ownership_and_return_values() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `gives_ownership`
[INFO] [stderr]   --> src/ownership.rs:88:4
[INFO] [stderr]    |
[INFO] [stderr] 88 | fn gives_ownership() -> String {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_and_gives_back`
[INFO] [stderr]    --> src/ownership.rs:101:4
[INFO] [stderr]     |
[INFO] [stderr] 101 | 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:109:4
[INFO] [stderr]     |
[INFO] [stderr] 109 | 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:4:4
[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: `changeable`
[INFO] [stderr]   --> src/references.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn changeable(some_string: &mut String) {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_work`
[INFO] [stderr]   --> src/references.rs:54:8
[INFO] [stderr]    |
[INFO] [stderr] 54 | pub fn this_work() {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_still_work`
[INFO] [stderr]   --> src/references.rs:67:8
[INFO] [stderr]    |
[INFO] [stderr] 67 | pub fn this_still_work() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_work_too`
[INFO] [stderr]   --> src/references.rs:77:8
[INFO] [stderr]    |
[INFO] [stderr] 77 | pub fn this_work_too() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `no_dangling_references`
[INFO] [stderr]   --> src/references.rs:94:8
[INFO] [stderr]    |
[INFO] [stderr] 94 | pub fn no_dangling_references() -> String {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word`
[INFO] [stderr]  --> src/slice_type.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn first_word(s: &String) -> usize {
[INFO] [stderr]   |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word_enhance`
[INFO] [stderr]   --> src/slice_type.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub fn first_word_enhance(s: &String) -> &str {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `username`
[INFO] [stderr]  --> src/struct_demo.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     username: String,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `sign_in_count`
[INFO] [stderr]  --> src/struct_demo.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     sign_in_count: u64,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> src/struct_demo.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     active: bool,
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 59 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `guess_number`
[INFO] [stderr]  --> src/guess.rs:5:8
[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:11:8
[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:24:8
[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:45:8
[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:53:8
[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:65:8
[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:75:8
[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:94:8
[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:102:8
[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:119:8
[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:160:8
[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:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn hello_world() {
[INFO] [stderr]   |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fn_with_parameters`
[INFO] [stderr]  --> src/my_functions.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn fn_with_parameters(x: i32, y: i32) {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `expression_based`
[INFO] [stderr]   --> src/my_functions.rs:10:8
[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:19:8
[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:29:8
[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:33:4
[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:3:8
[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:15:8
[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:25:8
[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:36:8
[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:48:8
[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:62:8
[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:70:8
[INFO] [stderr]    |
[INFO] [stderr] 70 | pub fn for_in_array() {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `move_vs_copy`
[INFO] [stderr]  --> src/ownership.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn move_vs_copy() {
[INFO] [stderr]   |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `double_free_error`
[INFO] [stderr]   --> src/ownership.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | 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:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 | 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:39:8
[INFO] [stderr]    |
[INFO] [stderr] 39 | 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:47:8
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub fn ownership_and_functions() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_ownership`
[INFO] [stderr]   --> src/ownership.rs:63:4
[INFO] [stderr]    |
[INFO] [stderr] 63 | fn takes_ownership(some_string: String) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `makes_copy`
[INFO] [stderr]   --> src/ownership.rs:67:4
[INFO] [stderr]    |
[INFO] [stderr] 67 | 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:71:8
[INFO] [stderr]    |
[INFO] [stderr] 71 | pub fn ownership_and_return_values() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `gives_ownership`
[INFO] [stderr]   --> src/ownership.rs:88:4
[INFO] [stderr]    |
[INFO] [stderr] 88 | fn gives_ownership() -> String {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_and_gives_back`
[INFO] [stderr]    --> src/ownership.rs:101:4
[INFO] [stderr]     |
[INFO] [stderr] 101 | 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:109:4
[INFO] [stderr]     |
[INFO] [stderr] 109 | 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:4:4
[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: `changeable`
[INFO] [stderr]   --> src/references.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn changeable(some_string: &mut String) {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_work`
[INFO] [stderr]   --> src/references.rs:54:8
[INFO] [stderr]    |
[INFO] [stderr] 54 | pub fn this_work() {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_still_work`
[INFO] [stderr]   --> src/references.rs:67:8
[INFO] [stderr]    |
[INFO] [stderr] 67 | pub fn this_still_work() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_work_too`
[INFO] [stderr]   --> src/references.rs:77:8
[INFO] [stderr]    |
[INFO] [stderr] 77 | pub fn this_work_too() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `no_dangling_references`
[INFO] [stderr]   --> src/references.rs:94:8
[INFO] [stderr]    |
[INFO] [stderr] 94 | pub fn no_dangling_references() -> String {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word`
[INFO] [stderr]  --> src/slice_type.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn first_word(s: &String) -> usize {
[INFO] [stderr]   |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word_enhance`
[INFO] [stderr]   --> src/slice_type.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub fn first_word_enhance(s: &String) -> &str {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `username`
[INFO] [stderr]  --> src/struct_demo.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     username: String,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `sign_in_count`
[INFO] [stderr]  --> src/struct_demo.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     sign_in_count: u64,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> src/struct_demo.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     active: bool,
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 59 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.65s
[INFO] running `"docker" "inspect" "42dc63213424613dc0f50dcb180d7f72ff6ab3dfd81e36609688b73b3bbc60a5"`
[INFO] running `"docker" "rm" "-f" "42dc63213424613dc0f50dcb180d7f72ff6ab3dfd81e36609688b73b3bbc60a5"`
[INFO] [stdout] 42dc63213424613dc0f50dcb180d7f72ff6ab3dfd81e36609688b73b3bbc60a5