[INFO] cloning repository https://github.com/OneMore14/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/OneMore14/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FOneMore14%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FOneMore14%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e242e59a6a8dad6caecbeffc53602df4d588c821
[INFO] checking OneMore14/rust-playground against master#4c60a0ea5b2385d7400df9db1ad04e96f2a4c154 for 92191_revert
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FOneMore14%2Frust-playground" "/workspace/builds/worker-18/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-18/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/OneMore14/rust-playground on toolchain 4c60a0ea5b2385d7400df9db1ad04e96f2a4c154
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4c60a0ea5b2385d7400df9db1ad04e96f2a4c154" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/OneMore14/rust-playground
[INFO] finished tweaking git repo https://github.com/OneMore14/rust-playground
[INFO] tweaked toml for git repo https://github.com/OneMore14/rust-playground written to /workspace/builds/worker-18/source/Cargo.toml
[INFO] crate git repo https://github.com/OneMore14/rust-playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4c60a0ea5b2385d7400df9db1ad04e96f2a4c154" "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-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+4c60a0ea5b2385d7400df9db1ad04e96f2a4c154" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d2ad17b29ae2cd867fbc5d5f50bae9cb4f9cedff409d155bf1b7f49f4bb2d3fd
[INFO] running `Command { std: "docker" "start" "-a" "d2ad17b29ae2cd867fbc5d5f50bae9cb4f9cedff409d155bf1b7f49f4bb2d3fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2ad17b29ae2cd867fbc5d5f50bae9cb4f9cedff409d155bf1b7f49f4bb2d3fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2ad17b29ae2cd867fbc5d5f50bae9cb4f9cedff409d155bf1b7f49f4bb2d3fd", kill_on_drop: false }`
[INFO] [stdout] d2ad17b29ae2cd867fbc5d5f50bae9cb4f9cedff409d155bf1b7f49f4bb2d3fd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+4c60a0ea5b2385d7400df9db1ad04e96f2a4c154" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 79887e2e7f392a437f1e95331838032541d7448f7c6257eb3025b453fa3363c5
[INFO] running `Command { std: "docker" "start" "-a" "79887e2e7f392a437f1e95331838032541d7448f7c6257eb3025b453fa3363c5", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rust-data-structure v0.1.0 (/opt/rustwide/workdir/rust-data-structure)
[INFO] [stderr]     Checking lists v0.1.0 (/opt/rustwide/workdir/lists)
[INFO] [stderr]     Checking leetcode v0.1.0 (/opt/rustwide/workdir/leetcode)
[INFO] [stderr]     Checking rust-by-example v0.1.0 (/opt/rustwide/workdir/rust-by-example)
[INFO] [stdout] warning: unused import: `std::cmp::min`
[INFO] [stdout]  --> leetcode/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cmp::min;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> leetcode/src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::min`
[INFO] [stdout]  --> leetcode/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cmp::min;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> leetcode/src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> leetcode/src/main.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let mut v1 : Vec<_>= version1.split('.').collect();
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> leetcode/src/main.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let mut v2 : Vec<_>= version2.split('.').collect();
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Solution`
[INFO] [stdout]  --> leetcode/src/main.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Solution{
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `compare_version`
[INFO] [stdout]  --> leetcode/src/main.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub fn compare_version(version1: String, version2: String) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> leetcode/src/main.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let mut v1 : Vec<_>= version1.split('.').collect();
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> leetcode/src/main.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let mut v2 : Vec<_>= version2.split('.').collect();
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Solution`
[INFO] [stdout]  --> leetcode/src/main.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Solution{
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `compare_version`
[INFO] [stdout]  --> leetcode/src/main.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub fn compare_version(version1: String, version2: String) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Stack`
[INFO] [stdout]  --> rust-data-structure/src/basic_data_structure/stack.rs:2:19
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub(crate) struct Stack<T> {
[INFO] [stdout]   |                   ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]  --> rust-data-structure/src/basic_data_structure/stack.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub fn new() -> Self {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push`
[INFO] [stdout]   --> rust-data-structure/src/basic_data_structure/stack.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn push(&mut self, value: T) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop`
[INFO] [stdout]   --> rust-data-structure/src/basic_data_structure/stack.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub fn pop(&mut self) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]   --> rust-data-structure/src/basic_data_structure/stack.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn size(&self) -> i32 {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_empty`
[INFO] [stdout]   --> rust-data-structure/src/basic_data_structure/stack.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn is_empty(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `peek`
[INFO] [stdout]   --> rust-data-structure/src/basic_data_structure/stack.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn peek(&self) -> Option<&T> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `divide_by_two`
[INFO] [stdout]  --> rust-data-structure/src/basic_data_structure/divide_by_two.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn divide_by_two(mut dec_num: u32) -> String {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::iter`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/dry.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     use std::iter;
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hello`
[INFO] [stdout]  --> rust-by-example/src/hello_world/hello.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn hello() {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/hello_world/formatted_print.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `debug`
[INFO] [stdout]   --> rust-by-example/src/hello_world/debug.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn debug() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/hello_world/display.rs:61:4
[INFO] [stdout]    |
[INFO] [stdout] 61 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `list`
[INFO] [stdout]    --> rust-by-example/src/hello_world/display.rs:117:4
[INFO] [stdout]     |
[INFO] [stdout] 117 | fn list() {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/hello_world/formatting.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Unit`
[INFO] [stdout]  --> rust-by-example/src/custom_types/structures.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Unit;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Pair`
[INFO] [stdout]   --> rust-by-example/src/custom_types/structures.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct Pair(i32, f32);
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/custom_types/structures.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `List`
[INFO] [stdout]  --> rust-by-example/src/custom_types/linked_list.rs:3:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum List {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> rust-by-example/src/custom_types/linked_list.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn new() -> List {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `prepend`
[INFO] [stdout]   --> rust-by-example/src/custom_types/linked_list.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 |     fn prepend(self, elem: u32) -> List {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `len`
[INFO] [stdout]   --> rust-by-example/src/custom_types/linked_list.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn len(&self) -> u32 {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `stringify`
[INFO] [stdout]   --> rust-by-example/src/custom_types/linked_list.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn stringify(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/custom_types/linked_list.rs:57:4
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static is never used: `LANGUAGE`
[INFO] [stdout]  --> rust-by-example/src/custom_types/constants.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | static LANGUAGE: &str = "Rust";
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `THRESHOLD`
[INFO] [stdout]  --> rust-by-example/src/custom_types/constants.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | const THRESHOLD: i32 = 10;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_big`
[INFO] [stdout]  --> rust-by-example/src/custom_types/constants.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn is_big(n: i32) -> bool {
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/custom_types/constants.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/variable_bindings/mod.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/variable_bindings/freezing.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/types/literals.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `NanoSecond`
[INFO] [stdout]  --> rust-by-example/src/types/aliasing.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | type NanoSecond = u64;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Inch`
[INFO] [stdout]  --> rust-by-example/src/types/aliasing.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | type Inch = u64;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `u64_t`
[INFO] [stdout]   --> rust-by-example/src/types/aliasing.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | type u64_t = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/types/aliasing.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/conversion/tryfrom_tryinto.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/conversion/to_and_from_strings.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/if_else.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/loops.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/while_.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/for_range.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/match_.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/match_destructuring.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tuples`
[INFO] [stdout]   --> rust-by-example/src/flow_of_control/match_destructuring.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn tuples() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `arrays_slice`
[INFO] [stdout]   --> rust-by-example/src/flow_of_control/match_destructuring.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn arrays_slice() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `enums`
[INFO] [stdout]   --> rust-by-example/src/flow_of_control/match_destructuring.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn enums() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `pointers_ref`
[INFO] [stdout]    --> rust-by-example/src/flow_of_control/match_destructuring.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn pointers_ref() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `structs`
[INFO] [stdout]    --> rust-by-example/src/flow_of_control/match_destructuring.rs:160:4
[INFO] [stdout]     |
[INFO] [stdout] 160 | fn structs() {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/match_guards.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `age`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/match_binding.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn age() -> u32 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_number`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/match_binding.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn some_number() -> Option<u32> {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/flow_of_control/match_binding.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/if_let.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/flow_of_control/while_let.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/functions/mod.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_divisible_by`
[INFO] [stdout]   --> rust-by-example/src/functions/mod.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn is_divisible_by(lhs: u32, rhs: u32) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fizzbuzz`
[INFO] [stdout]   --> rust-by-example/src/functions/mod.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn fizzbuzz(n: u32) -> () {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fizzbuzz_to`
[INFO] [stdout]   --> rust-by-example/src/functions/mod.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn fizzbuzz_to(n: u32) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]  --> rust-by-example/src/functions/methods.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Point {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `origin`
[INFO] [stdout]   --> rust-by-example/src/functions/methods.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fn origin() -> Point {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> rust-by-example/src/functions/methods.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn new(x: f64, y: f64) -> Point {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Rectangle`
[INFO] [stdout]   --> rust-by-example/src/functions/methods.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct Rectangle {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]   --> rust-by-example/src/functions/methods.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn area(&self) -> f64 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `perimeter`
[INFO] [stdout]   --> rust-by-example/src/functions/methods.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 |     fn perimeter(&self) -> f64 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `translate`
[INFO] [stdout]   --> rust-by-example/src/functions/methods.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 |     fn translate(&mut self, x: f64, y: f64) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Pair`
[INFO] [stdout]   --> rust-by-example/src/functions/methods.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | struct Pair(Box<i32>, Box<i32>);
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `destroy`
[INFO] [stdout]   --> rust-by-example/src/functions/methods.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 66 |     fn destroy(self) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/functions/methods.rs:76:4
[INFO] [stdout]    |
[INFO] [stdout] 76 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/functions/closures.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `closures`
[INFO] [stdout]   --> rust-by-example/src/functions/closures.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn closures() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `capturing`
[INFO] [stdout]   --> rust-by-example/src/functions/closures.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn capturing() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `apply`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:105:4
[INFO] [stdout]     |
[INFO] [stdout] 105 | fn apply<F>(f: F) where
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `apply_to_3`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:114:4
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn apply_to_3<F>(f: F) -> i32 where
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `as_input_parameters`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:121:4
[INFO] [stdout]     |
[INFO] [stdout] 121 | fn as_input_parameters() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `type_anonymity`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:155:4
[INFO] [stdout]     |
[INFO] [stdout] 155 | fn type_anonymity() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `call_me`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:167:4
[INFO] [stdout]     |
[INFO] [stdout] 167 | fn call_me<F: Fn()>(f: F) {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:172:4
[INFO] [stdout]     |
[INFO] [stdout] 172 | fn function() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `input_functions`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:176:4
[INFO] [stdout]     |
[INFO] [stdout] 176 | fn input_functions() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_fn`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:185:4
[INFO] [stdout]     |
[INFO] [stdout] 185 | fn create_fn() -> impl Fn() {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_fnmut`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:191:4
[INFO] [stdout]     |
[INFO] [stdout] 191 | fn create_fnmut() -> impl FnMut() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_fnonce`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:197:4
[INFO] [stdout]     |
[INFO] [stdout] 197 | fn create_fnonce() -> impl FnOnce() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `as_output_parameters`
[INFO] [stdout]    --> rust-by-example/src/functions/closures.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn as_output_parameters() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_odd`
[INFO] [stdout]  --> rust-by-example/src/functions/higher_order_functions.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn is_odd(n: u32) -> bool {
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/functions/higher_order_functions.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]   --> rust-by-example/src/modules/visibility.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn function() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/modules/visibility.rs:83:4
[INFO] [stdout]    |
[INFO] [stdout] 83 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `private_function`
[INFO] [stdout]  --> rust-by-example/src/modules/visibility.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 |     fn private_function() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]  --> rust-by-example/src/modules/visibility.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 |     pub fn function() {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `indirect_access`
[INFO] [stdout]   --> rust-by-example/src/modules/visibility.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn indirect_access() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `call_public_function_in_my_mod`
[INFO] [stdout]   --> rust-by-example/src/modules/visibility.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 51 |     pub fn call_public_function_in_my_mod() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `public_function_in_crate`
[INFO] [stdout]   --> rust-by-example/src/modules/visibility.rs:59:19
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub(crate) fn public_function_in_crate() {
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]   --> rust-by-example/src/modules/visibility.rs:22:16
[INFO] [stdout]    |
[INFO] [stdout] 22 |         pub fn function() {
[INFO] [stdout]    |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `public_function_in_my_mod`
[INFO] [stdout]   --> rust-by-example/src/modules/visibility.rs:33:55
[INFO] [stdout]    |
[INFO] [stdout] 33 |         pub(in crate::modules::visibility::my_mod) fn public_function_in_my_mod() {
[INFO] [stdout]    |                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `public_function_in_nested`
[INFO] [stdout]   --> rust-by-example/src/modules/visibility.rs:40:22
[INFO] [stdout]    |
[INFO] [stdout] 40 |         pub(self) fn public_function_in_nested() {
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `public_function_in_super_mod`
[INFO] [stdout]   --> rust-by-example/src/modules/visibility.rs:46:23
[INFO] [stdout]    |
[INFO] [stdout] 46 |         pub(super) fn public_function_in_super_mod() {
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/modules/struct_visibility.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `OpenBox`
[INFO] [stdout]  --> rust-by-example/src/modules/struct_visibility.rs:3:16
[INFO] [stdout]   |
[INFO] [stdout] 3 |     pub struct OpenBox<T> {
[INFO] [stdout]   |                ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> rust-by-example/src/modules/struct_visibility.rs:15:16
[INFO] [stdout]    |
[INFO] [stdout] 15 |         pub fn new(contents: T) -> ClosedBox<T> {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]  --> rust-by-example/src/modules/use_.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn function() {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/modules/use_.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]   --> rust-by-example/src/modules/use_.rs:10:16
[INFO] [stdout]    |
[INFO] [stdout] 10 |         pub fn function() {
[INFO] [stdout]    |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]  --> rust-by-example/src/modules/super_and_self.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn function() {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/modules/super_and_self.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]  --> rust-by-example/src/modules/super_and_self.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub fn function() {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]   --> rust-by-example/src/modules/super_and_self.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn function() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `indirect_call`
[INFO] [stdout]   --> rust-by-example/src/modules/super_and_self.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn indirect_call() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function`
[INFO] [stdout]   --> rust-by-example/src/modules/super_and_self.rs:17:16
[INFO] [stdout]    |
[INFO] [stdout] 17 |         pub fn function() {
[INFO] [stdout]    |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `A`
[INFO] [stdout]   --> rust-by-example/src/generics/mod.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct A;
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Single`
[INFO] [stdout]   --> rust-by-example/src/generics/mod.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct Single(A);
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SingleGen`
[INFO] [stdout]   --> rust-by-example/src/generics/mod.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct SingleGen<T>(T);
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/generics/mod.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `A`
[INFO] [stdout]  --> rust-by-example/src/generics/functions.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct A;          // Concrete type `A`.
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `S`
[INFO] [stdout]  --> rust-by-example/src/generics/functions.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct S(A);       // Concrete type `S`.
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SGen`
[INFO] [stdout]  --> rust-by-example/src/generics/functions.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct SGen<T>(T); // Generic type `SGen`.
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reg_fn`
[INFO] [stdout]   --> rust-by-example/src/generics/functions.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn reg_fn(_s: S) {}
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gen_spec_t`
[INFO] [stdout]   --> rust-by-example/src/generics/functions.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn gen_spec_t(_s: SGen<A>) {}
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gen_spec_i32`
[INFO] [stdout]   --> rust-by-example/src/generics/functions.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn gen_spec_i32(_s: SGen<i32>) {}
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generic`
[INFO] [stdout]   --> rust-by-example/src/generics/functions.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn generic<T>(_s: SGen<T>) {}
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/generics/functions.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Empty`
[INFO] [stdout]  --> rust-by-example/src/generics/traits.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Empty;
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Null`
[INFO] [stdout]  --> rust-by-example/src/generics/traits.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Null;
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/generics/traits.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `compare_prints`
[INFO] [stdout]  --> rust-by-example/src/generics/multiple_bounds.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn compare_prints<T: Debug + Display>(t: &T) {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `compare_types`
[INFO] [stdout]  --> rust-by-example/src/generics/multiple_bounds.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn compare_types<T: Debug, U: Debug>(t: &T, u: &U) {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/generics/multiple_bounds.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/generics/where_clauses.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Years`
[INFO] [stdout]  --> rust-by-example/src/generics/new_type_ldiom.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Years(i64);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Days`
[INFO] [stdout]  --> rust-by-example/src/generics/new_type_ldiom.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Days(i64);
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_days`
[INFO] [stdout]  --> rust-by-example/src/generics/new_type_ldiom.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub fn to_days(&self) -> Days {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_years`
[INFO] [stdout]   --> rust-by-example/src/generics/new_type_ldiom.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn to_years(&self) -> Years {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `old_enough`
[INFO] [stdout]   --> rust-by-example/src/generics/new_type_ldiom.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn old_enough(age: &Years) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/generics/new_type_ldiom.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `difference`
[INFO] [stdout]   --> rust-by-example/src/generics/associated_items_problem.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn difference<A, B, C>(container: &C) -> i32 where
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/generics/associated_items_problem.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `difference`
[INFO] [stdout]   --> rust-by-example/src/generics/associated_items_types.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn difference<C: Contains>(container: &C) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/generics/associated_items_types.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/generics/phantom_type_parameters.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unit_clarification`
[INFO] [stdout]   --> rust-by-example/src/generics/phantom_type_parameters.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn unit_clarification() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_box`
[INFO] [stdout]  --> rust-by-example/src/scoping_rules/raii.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn create_box() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/scoping_rules/raii.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `destroy_box`
[INFO] [stdout]  --> rust-by-example/src/scoping_rules/ownership_moves.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn destroy_box(c: Box<i32>) {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/scoping_rules/ownership_moves.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mutability`
[INFO] [stdout]   --> rust-by-example/src/scoping_rules/ownership_moves.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn mutability() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `partial_moves`
[INFO] [stdout]   --> rust-by-example/src/scoping_rules/ownership_moves.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn partial_moves() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `eat_box_i32`
[INFO] [stdout]  --> rust-by-example/src/scoping_rules/borrowing.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn eat_box_i32(boxed_i32: Box<i32>) {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `borrow_i32`
[INFO] [stdout]  --> rust-by-example/src/scoping_rules/borrowing.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn borrow_i32(borrowed_i32: &i32) {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/scoping_rules/borrowing.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `borrow_book`
[INFO] [stdout]   --> rust-by-example/src/scoping_rules/borrowing.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn borrow_book(book: &Book) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `new_edition`
[INFO] [stdout]   --> rust-by-example/src/scoping_rules/borrowing.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn new_edition(book: &mut Book) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mutability`
[INFO] [stdout]   --> rust-by-example/src/scoping_rules/borrowing.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn mutability() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> rust-by-example/src/scoping_rules/borrowing.rs:85:8
[INFO] [stdout]    |
[INFO] [stdout] 85 | struct Point { x: i32, y: i32, z: i32 }
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `aliasing`
[INFO] [stdout]   --> rust-by-example/src/scoping_rules/borrowing.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn aliasing() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `the_ref_pattern`
[INFO] [stdout]    --> rust-by-example/src/scoping_rules/borrowing.rs:135:4
[INFO] [stdout]     |
[INFO] [stdout] 135 | fn the_ref_pattern() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `shear`
[INFO] [stdout]   --> rust-by-example/src/traits/mod.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 |     fn shear(&mut self) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/traits/mod.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_centimeters`
[INFO] [stdout]   --> rust-by-example/src/traits/derive.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn to_centimeters(&self) -> Centimeters {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Seconds`
[INFO] [stdout]   --> rust-by-example/src/traits/derive.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct Seconds(i32);
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/traits/derive.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `random_animal`
[INFO] [stdout]   --> rust-by-example/src/traits/returning_traits_with_dyn.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn random_animal(random_number: f64) -> Box<dyn Animal> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/traits/returning_traits_with_dyn.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/traits/operator_overloading.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/traits/drop.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fibonacci`
[INFO] [stdout]   --> rust-by-example/src/traits/iterators.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn fibonacci() -> Fibonacci {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/traits/iterators.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/traits/clone.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/mod.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/syntax_designators.rs:6:9
[INFO] [stdout]    |
[INFO] [stdout] 6  |         fn $func_name() {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 | create_function!(foo);
[INFO] [stdout]    | --------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `create_function` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `bar`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/syntax_designators.rs:6:9
[INFO] [stdout]    |
[INFO] [stdout] 6  |         fn $func_name() {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 | create_function!(bar);
[INFO] [stdout]    | --------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `create_function` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/syntax_designators.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/syntax_overload.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/syntax_repeat.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_assign`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/dry.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         fn $func<T: $bound<T, Output=T> + Copy>(xs: &mut Vec<T>, ys: &Vec<T>) {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 | op!(add_assign, Add, +=, add);
[INFO] [stdout]    | ----------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mul_assign`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/dry.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         fn $func<T: $bound<T, Output=T> + Copy>(xs: &mut Vec<T>, ys: &Vec<T>) {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 | op!(mul_assign, Mul, *=, mul);
[INFO] [stdout]    | ----------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_assign`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/dry.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         fn $func<T: $bound<T, Output=T> + Copy>(xs: &mut Vec<T>, ys: &Vec<T>) {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 | op!(sub_assign, Sub, -=, sub);
[INFO] [stdout]    | ----------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/dsl.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> rust-by-example/src/macro_rules/variadic.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `drink`
[INFO] [stdout]  --> rust-by-example/src/error_handling/panic.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn drink(beverage: &str) {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/error_handling/panic.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multiply`
[INFO] [stdout]  --> rust-by-example/src/error_handling/result.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn multiply(first_number_str: &str, second_number_str: &str) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]  --> rust-by-example/src/error_handling/result.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `map`
[INFO] [stdout]   --> rust-by-example/src/error_handling/result.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn map() {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `and_then`
[INFO] [stdout]   --> rust-by-example/src/error_handling/result.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn and_then() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `aliases`
[INFO] [stdout]   --> rust-by-example/src/error_handling/result.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn aliases() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `early_returns`
[INFO] [stdout]    --> rust-by-example/src/error_handling/result.rs:105:4
[INFO] [stdout]     |
[INFO] [stdout] 105 | fn early_returns() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `question_marker`
[INFO] [stdout]    --> rust-by-example/src/error_handling/result.rs:133:4
[INFO] [stdout]     |
[INFO] [stdout] 133 | fn question_marker() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 177 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.21s
[INFO] running `Command { std: "docker" "inspect" "79887e2e7f392a437f1e95331838032541d7448f7c6257eb3025b453fa3363c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79887e2e7f392a437f1e95331838032541d7448f7c6257eb3025b453fa3363c5", kill_on_drop: false }`
[INFO] [stdout] 79887e2e7f392a437f1e95331838032541d7448f7c6257eb3025b453fa3363c5