[INFO] cloning repository https://github.com/abrcdf1023/rust_hello_world
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/abrcdf1023/rust_hello_world" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabrcdf1023%2Frust_hello_world", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabrcdf1023%2Frust_hello_world'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2254a2b443298ef766ba98848542044429daaba8
[INFO] building abrcdf1023/rust_hello_world against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fabrcdf1023%2Frust_hello_world" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/abrcdf1023/rust_hello_world on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-6-tc1/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 `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e293f9c8eb2a82d9b7a40dcaf717750b5d9693d2946be96ed8a46698128c995f
[INFO] running `Command { std: "docker" "start" "-a" "e293f9c8eb2a82d9b7a40dcaf717750b5d9693d2946be96ed8a46698128c995f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e293f9c8eb2a82d9b7a40dcaf717750b5d9693d2946be96ed8a46698128c995f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e293f9c8eb2a82d9b7a40dcaf717750b5d9693d2946be96ed8a46698128c995f", kill_on_drop: false }`
[INFO] [stdout] e293f9c8eb2a82d9b7a40dcaf717750b5d9693d2946be96ed8a46698128c995f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2e7ce4a66aaad7e81e8db0312ff380bae6083eb386fb2d2fc4601ef0692338ba
[INFO] running `Command { std: "docker" "start" "-a" "2e7ce4a66aaad7e81e8db0312ff380bae6083eb386fb2d2fc4601ef0692338ba", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling rust_hello_world v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/datatype.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/datatype.rs:48:7
[INFO] [stdout]    |
[INFO] [stdout] 48 |   let y: i64 = 30; 
[INFO] [stdout]    |       ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/datatype.rs:123:8
[INFO] [stdout]     |
[INFO] [stdout] 123 |   let (x, y, z) = tup;
[INFO] [stdout]     |        ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]    --> src/datatype.rs:123:14
[INFO] [stdout]     |
[INFO] [stdout] 123 |   let (x, y, z) = tup;
[INFO] [stdout]     |              ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/datatype.rs:145:7
[INFO] [stdout]     |
[INFO] [stdout] 145 |   let a: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stdout]     |       ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/ownership.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 |   let y = x;
[INFO] [stdout]   |       ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/ownership.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 |   let s2 = s1;
[INFO] [stdout]   |       ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> src/ownership.rs:72:7
[INFO] [stdout]    |
[INFO] [stdout] 72 |   let s1 = gives_ownership(); // gives_ownership moves its return
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/references.rs:81:11
[INFO] [stdout]    |
[INFO] [stdout] 81 |       let r1 = &mut s;
[INFO] [stdout]    |           ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/references.rs:85:7
[INFO] [stdout]    |
[INFO] [stdout] 85 |   let r2 = &mut s;
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `guess_number` is never used
[INFO] [stdout]  --> src/guess.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn guess_number() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutable` is never used
[INFO] [stdout]   --> src/datatype.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn mutable() {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variables_shadowing` is never used
[INFO] [stdout]   --> src/datatype.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn variables_shadowing() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_types` is never used
[INFO] [stdout]   --> src/datatype.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | pub fn data_types() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_types_integer` is never used
[INFO] [stdout]   --> src/datatype.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 | pub fn data_types_integer() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_types_float` is never used
[INFO] [stdout]   --> src/datatype.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub fn data_types_float() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `numeric_operations` is never used
[INFO] [stdout]   --> src/datatype.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 | pub fn numeric_operations() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_types_boolean` is never used
[INFO] [stdout]   --> src/datatype.rs:94:8
[INFO] [stdout]    |
[INFO] [stdout] 94 | pub fn data_types_boolean() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_types_char` is never used
[INFO] [stdout]    --> src/datatype.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn data_types_char() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compound_types` is never used
[INFO] [stdout]    --> src/datatype.rs:119:8
[INFO] [stdout]     |
[INFO] [stdout] 119 | pub fn compound_types() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `GLOBAL_VALUE` is never used
[INFO] [stdout]    --> src/datatype.rs:157:7
[INFO] [stdout]     |
[INFO] [stdout] 157 | const GLOBAL_VALUE: &str = "發大財";
[INFO] [stdout]     |       ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `CHANGABLE_GLOBAL_VALUE` is never used
[INFO] [stdout]    --> src/datatype.rs:158:8
[INFO] [stdout]     |
[INFO] [stdout] 158 | static CHANGABLE_GLOBAL_VALUE: f64 = 10.5;
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_with_mixed_data_type` is never used
[INFO] [stdout]    --> src/datatype.rs:160:8
[INFO] [stdout]     |
[INFO] [stdout] 160 | pub fn tuple_with_mixed_data_type() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello_world` is never used
[INFO] [stdout]  --> src/my_functions.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn hello_world() {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fn_with_parameters` is never used
[INFO] [stdout]  --> src/my_functions.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn fn_with_parameters(x: i32, y: i32) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `expression_based` is never used
[INFO] [stdout]   --> src/my_functions.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn expression_based() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `statement_test` is never used
[INFO] [stdout]   --> src/my_functions.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn statement_test() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]   --> src/my_functions.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn add(x: i32, y: i32) -> i32 {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `private_fn` is never used
[INFO] [stdout]   --> src/my_functions.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn private_fn(x: i32, y: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mul_condition` is never used
[INFO] [stdout]  --> src/control_flow.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn mul_condition(number: i32) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_match` is never used
[INFO] [stdout]   --> src/control_flow.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn use_match(number: i32) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_if_expression` is never used
[INFO] [stdout]   --> src/control_flow.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub fn use_if_expression() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_to_100` is never used
[INFO] [stdout]   --> src/control_flow.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn add_to_100() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_result` is never used
[INFO] [stdout]   --> src/control_flow.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | pub fn loop_result() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reduce_to_0` is never used
[INFO] [stdout]   --> src/control_flow.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub fn reduce_to_0() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_in_array` is never used
[INFO] [stdout]   --> src/control_flow.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 70 | pub fn for_in_array() {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `move_vs_copy` is never used
[INFO] [stdout]  --> src/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn move_vs_copy() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `double_free_error` is never used
[INFO] [stdout]   --> src/ownership.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn double_free_error() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `to_fixed_double_free_error` is never used
[INFO] [stdout]   --> src/ownership.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn to_fixed_double_free_error() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `without_double_free_error` is never used
[INFO] [stdout]   --> src/ownership.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn without_double_free_error() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_and_functions` is never used
[INFO] [stdout]   --> src/ownership.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn ownership_and_functions() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn takes_ownership(some_string: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/ownership.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn makes_copy(some_integer: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_and_return_values` is never used
[INFO] [stdout]   --> src/ownership.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 | pub fn ownership_and_return_values() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gives_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn gives_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_and_gives_back` is never used
[INFO] [stdout]    --> src/ownership.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn takes_and_gives_back(a_string: String) -> String {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]    --> src/ownership.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]  --> src/references.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn calculate_length(s: &String) -> usize { // s is a reference to a String
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `changeable` is never used
[INFO] [stdout]   --> src/references.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn changeable(some_string: &mut String) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `this_work` is never used
[INFO] [stdout]   --> src/references.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn this_work() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `this_still_work` is never used
[INFO] [stdout]   --> src/references.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub fn this_still_work() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `this_work_too` is never used
[INFO] [stdout]   --> src/references.rs:77:8
[INFO] [stdout]    |
[INFO] [stdout] 77 | pub fn this_work_too() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_dangling_references` is never used
[INFO] [stdout]   --> src/references.rs:94:8
[INFO] [stdout]    |
[INFO] [stdout] 94 | pub fn no_dangling_references() -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]  --> src/slice_type.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn first_word(s: &String) -> usize {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word_enhance` is never used
[INFO] [stdout]   --> src/slice_type.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn first_word_enhance(s: &String) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `username`, `sign_in_count`, and `active` are never read
[INFO] [stdout]  --> src/struct_demo.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |   struct User {
[INFO] [stdout]   |          ---- fields in this struct
[INFO] [stdout] 3 |     username: String,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 6 |     active: bool,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.62s
[INFO] running `Command { std: "docker" "inspect" "2e7ce4a66aaad7e81e8db0312ff380bae6083eb386fb2d2fc4601ef0692338ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e7ce4a66aaad7e81e8db0312ff380bae6083eb386fb2d2fc4601ef0692338ba", kill_on_drop: false }`
[INFO] [stdout] 2e7ce4a66aaad7e81e8db0312ff380bae6083eb386fb2d2fc4601ef0692338ba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d2d17e697b63d27e6ad2bf1454f0c51ebb3c0bcc4e1c257a48fdb25eaf2674ec
[INFO] running `Command { std: "docker" "start" "-a" "d2d17e697b63d27e6ad2bf1454f0c51ebb3c0bcc4e1c257a48fdb25eaf2674ec", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_hello_world v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/datatype.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/datatype.rs:48:7
[INFO] [stdout]    |
[INFO] [stdout] 48 |   let y: i64 = 30; 
[INFO] [stdout]    |       ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/datatype.rs:123:8
[INFO] [stdout]     |
[INFO] [stdout] 123 |   let (x, y, z) = tup;
[INFO] [stdout]     |        ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]    --> src/datatype.rs:123:14
[INFO] [stdout]     |
[INFO] [stdout] 123 |   let (x, y, z) = tup;
[INFO] [stdout]     |              ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/datatype.rs:145:7
[INFO] [stdout]     |
[INFO] [stdout] 145 |   let a: [i32; 5] = [1, 2, 3, 4, 5];
[INFO] [stdout]     |       ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/ownership.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 |   let y = x;
[INFO] [stdout]   |       ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/ownership.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 |   let s2 = s1;
[INFO] [stdout]   |       ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> src/ownership.rs:72:7
[INFO] [stdout]    |
[INFO] [stdout] 72 |   let s1 = gives_ownership(); // gives_ownership moves its return
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/references.rs:81:11
[INFO] [stdout]    |
[INFO] [stdout] 81 |       let r1 = &mut s;
[INFO] [stdout]    |           ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/references.rs:85:7
[INFO] [stdout]    |
[INFO] [stdout] 85 |   let r2 = &mut s;
[INFO] [stdout]    |       ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `guess_number` is never used
[INFO] [stdout]  --> src/guess.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn guess_number() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutable` is never used
[INFO] [stdout]   --> src/datatype.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn mutable() {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variables_shadowing` is never used
[INFO] [stdout]   --> src/datatype.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn variables_shadowing() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_types` is never used
[INFO] [stdout]   --> src/datatype.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | pub fn data_types() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_types_integer` is never used
[INFO] [stdout]   --> src/datatype.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 | pub fn data_types_integer() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_types_float` is never used
[INFO] [stdout]   --> src/datatype.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 | pub fn data_types_float() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `numeric_operations` is never used
[INFO] [stdout]   --> src/datatype.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 | pub fn numeric_operations() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_types_boolean` is never used
[INFO] [stdout]   --> src/datatype.rs:94:8
[INFO] [stdout]    |
[INFO] [stdout] 94 | pub fn data_types_boolean() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `data_types_char` is never used
[INFO] [stdout]    --> src/datatype.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn data_types_char() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compound_types` is never used
[INFO] [stdout]    --> src/datatype.rs:119:8
[INFO] [stdout]     |
[INFO] [stdout] 119 | pub fn compound_types() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `GLOBAL_VALUE` is never used
[INFO] [stdout]    --> src/datatype.rs:157:7
[INFO] [stdout]     |
[INFO] [stdout] 157 | const GLOBAL_VALUE: &str = "發大財";
[INFO] [stdout]     |       ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `CHANGABLE_GLOBAL_VALUE` is never used
[INFO] [stdout]    --> src/datatype.rs:158:8
[INFO] [stdout]     |
[INFO] [stdout] 158 | static CHANGABLE_GLOBAL_VALUE: f64 = 10.5;
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_with_mixed_data_type` is never used
[INFO] [stdout]    --> src/datatype.rs:160:8
[INFO] [stdout]     |
[INFO] [stdout] 160 | pub fn tuple_with_mixed_data_type() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hello_world` is never used
[INFO] [stdout]  --> src/my_functions.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn hello_world() {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fn_with_parameters` is never used
[INFO] [stdout]  --> src/my_functions.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn fn_with_parameters(x: i32, y: i32) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `expression_based` is never used
[INFO] [stdout]   --> src/my_functions.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn expression_based() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `statement_test` is never used
[INFO] [stdout]   --> src/my_functions.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn statement_test() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]   --> src/my_functions.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub fn add(x: i32, y: i32) -> i32 {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `private_fn` is never used
[INFO] [stdout]   --> src/my_functions.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn private_fn(x: i32, y: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mul_condition` is never used
[INFO] [stdout]  --> src/control_flow.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn mul_condition(number: i32) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_match` is never used
[INFO] [stdout]   --> src/control_flow.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn use_match(number: i32) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `use_if_expression` is never used
[INFO] [stdout]   --> src/control_flow.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub fn use_if_expression() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_to_100` is never used
[INFO] [stdout]   --> src/control_flow.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn add_to_100() {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `loop_result` is never used
[INFO] [stdout]   --> src/control_flow.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | pub fn loop_result() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reduce_to_0` is never used
[INFO] [stdout]   --> src/control_flow.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub fn reduce_to_0() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_in_array` is never used
[INFO] [stdout]   --> src/control_flow.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 70 | pub fn for_in_array() {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `move_vs_copy` is never used
[INFO] [stdout]  --> src/ownership.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn move_vs_copy() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `double_free_error` is never used
[INFO] [stdout]   --> src/ownership.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn double_free_error() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `to_fixed_double_free_error` is never used
[INFO] [stdout]   --> src/ownership.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn to_fixed_double_free_error() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `without_double_free_error` is never used
[INFO] [stdout]   --> src/ownership.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn without_double_free_error() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_and_functions` is never used
[INFO] [stdout]   --> src/ownership.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn ownership_and_functions() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn takes_ownership(some_string: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/ownership.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn makes_copy(some_integer: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_and_return_values` is never used
[INFO] [stdout]   --> src/ownership.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 71 | pub fn ownership_and_return_values() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gives_ownership` is never used
[INFO] [stdout]   --> src/ownership.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn gives_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_and_gives_back` is never used
[INFO] [stdout]    --> src/ownership.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn takes_and_gives_back(a_string: String) -> String {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]    --> src/ownership.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn calculate_length(s: String) -> (String, usize) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]  --> src/references.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn calculate_length(s: &String) -> usize { // s is a reference to a String
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `changeable` is never used
[INFO] [stdout]   --> src/references.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn changeable(some_string: &mut String) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `this_work` is never used
[INFO] [stdout]   --> src/references.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 | pub fn this_work() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `this_still_work` is never used
[INFO] [stdout]   --> src/references.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub fn this_still_work() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `this_work_too` is never used
[INFO] [stdout]   --> src/references.rs:77:8
[INFO] [stdout]    |
[INFO] [stdout] 77 | pub fn this_work_too() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_dangling_references` is never used
[INFO] [stdout]   --> src/references.rs:94:8
[INFO] [stdout]    |
[INFO] [stdout] 94 | pub fn no_dangling_references() -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]  --> src/slice_type.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn first_word(s: &String) -> usize {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word_enhance` is never used
[INFO] [stdout]   --> src/slice_type.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn first_word_enhance(s: &String) -> &str {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `username`, `sign_in_count`, and `active` are never read
[INFO] [stdout]  --> src/struct_demo.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |   struct User {
[INFO] [stdout]   |          ---- fields in this struct
[INFO] [stdout] 3 |     username: String,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 6 |     active: bool,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.27s
[INFO] running `Command { std: "docker" "inspect" "d2d17e697b63d27e6ad2bf1454f0c51ebb3c0bcc4e1c257a48fdb25eaf2674ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2d17e697b63d27e6ad2bf1454f0c51ebb3c0bcc4e1c257a48fdb25eaf2674ec", kill_on_drop: false }`
[INFO] [stdout] d2d17e697b63d27e6ad2bf1454f0c51ebb3c0bcc4e1c257a48fdb25eaf2674ec