[INFO] cloning repository https://github.com/Reso1mi/rust-demo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Reso1mi/rust-demo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FReso1mi%2Frust-demo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FReso1mi%2Frust-demo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ef85346bdbeebbdd97fd82fb82eb2a23af3ea0ac
[INFO] checking Reso1mi/rust-demo against a5689b034ad287112f709693384a37f1377eb9cc for pr-129249-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FReso1mi%2Frust-demo" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Reso1mi/rust-demo
[INFO] finished tweaking git repo https://github.com/Reso1mi/rust-demo
[INFO] tweaked toml for git repo https://github.com/Reso1mi/rust-demo written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Reso1mi/rust-demo on toolchain a5689b034ad287112f709693384a37f1377eb9cc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a5689b034ad287112f709693384a37f1377eb9cc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Reso1mi/rust-demo 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" "+a5689b034ad287112f709693384a37f1377eb9cc" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] b69b7d02cd39b493eb910f443b963442aaf6c001e39875e3277131ff86700819
[INFO] running `Command { std: "docker" "start" "b69b7d02cd39b493eb910f443b963442aaf6c001e39875e3277131ff86700819", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b69b7d02cd39b493eb910f443b963442aaf6c001e39875e3277131ff86700819", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "b69b7d02cd39b493eb910f443b963442aaf6c001e39875e3277131ff86700819" "/opt/rustwide/cargo-home/bin/cargo" "+a5689b034ad287112f709693384a37f1377eb9cc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b69b7d02cd39b493eb910f443b963442aaf6c001e39875e3277131ff86700819", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "b69b7d02cd39b493eb910f443b963442aaf6c001e39875e3277131ff86700819" "/opt/rustwide/cargo-home/bin/cargo" "+a5689b034ad287112f709693384a37f1377eb9cc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `fmt::format`
[INFO] [stdout]  --> src/bin/async_echo_server.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     fmt::format,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc` and `Thread`
[INFO] [stdout]  --> src/bin/chan_1.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 |     sync::{Arc, mpsc},
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 3 |     thread::{self, Thread},
[INFO] [stdout]   |                    ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `utils::HelloMacro`
[INFO] [stdout]  --> src/bin/marcro_1.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use utils::HelloMacro;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::num`
[INFO] [stdout]  --> src/bin/closure_4.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::num;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/static_1.rs:71:9
[INFO] [stdout]    |
[INFO] [stdout] 71 |     let mut v = "s13".to_string();
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/bin/static_1.rs:70:9
[INFO] [stdout]    |
[INFO] [stdout] 70 |     let c = 1;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/static_1.rs:71:9
[INFO] [stdout]    |
[INFO] [stdout] 71 |     let mut v = "s13".to_string();
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `REQUEST_RECV` is never used
[INFO] [stdout]   --> src/bin/static_1.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | static mut REQUEST_RECV: usize = 0;
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Config` is never constructed
[INFO] [stdout]   --> src/bin/static_1.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Config {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `CONFIG` is never used
[INFO] [stdout]   --> src/bin/static_1.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 38 | static mut CONFIG: Option<&'static mut Config> = None;
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `CONFIG_2` is never used
[INFO] [stdout]   --> src/bin/static_1.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | static CONFIG_2: OnceLock<Config> = OnceLock::new();
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test2` is never used
[INFO] [stdout]   --> src/bin/static_1.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn test2() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_box_leak` is never used
[INFO] [stdout]   --> src/bin/static_1.rs:60:4
[INFO] [stdout]    |
[INFO] [stdout] 60 | fn test_box_leak() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/bin/proc_marcro_1.rs:11:17
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct SomeData(u32, String);
[INFO] [stdout]    |        -------- ^^^  ^^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout]    = note: `SomeData` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `data` are never read
[INFO] [stdout]   --> src/bin/proc_marcro_1.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct User {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 15 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 16 |     data: SomeData,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cloned`
[INFO] [stdout]   --> src/bin/type_1.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let cloned = value.clone();
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_cloned`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/type_1.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut a = &mut 0;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/type_1.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut b = &0;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/bin/type_1.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut a = &mut 0;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/bin/type_1.rs:21:27
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn recive_2<T: Trait>(t: T) {}
[INFO] [stdout]    |                           ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_stuff` is never used
[INFO] [stdout]  --> src/bin/type_1.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn do_stuff<T: Clone>(value: &T) {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_enum` is never used
[INFO] [stdout]   --> src/bin/chan_1.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn send_enum() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `block_chan` is never used
[INFO] [stdout]   --> src/bin/chan_1.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn block_chan() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_some` is never used
[INFO] [stdout]   --> src/bin/chan_1.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn send_some() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/bin/chan_1.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn test() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `trans_ownership` is never used
[INFO] [stdout]    --> src/bin/chan_1.rs:110:4
[INFO] [stdout]     |
[INFO] [stdout] 110 | fn trans_ownership() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `try_recv` is never used
[INFO] [stdout]    --> src/bin/chan_1.rs:125:4
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn try_recv() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `recv_1` is never used
[INFO] [stdout]    --> src/bin/chan_1.rs:136:4
[INFO] [stdout]     |
[INFO] [stdout] 136 | fn recv_1() {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::format`
[INFO] [stdout]  --> src/bin/vector_2.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::format;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/ownership_3.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let mut str_opt2 = &StrOpt {
[INFO] [stdout]    |             ----^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/ownership_3.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let v = match &str_opt.value {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/ownership_3.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let v = match str_opt.value {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/ownership_3.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let v = match str_opt.value {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/ownership_3.rs:60:13
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let v = match s.raw_int {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str_opt2`
[INFO] [stdout]   --> src/bin/ownership_3.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let mut str_opt2 = &StrOpt {
[INFO] [stdout]    |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_opt2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]    --> src/bin/ownership_3.rs:134:21
[INFO] [stdout]     |
[INFO] [stdout] 134 |                 let z = (self.calc)(&arg);
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_value` is never used
[INFO] [stdout]   --> src/bin/ownership_3.rs:73:16
[INFO] [stdout]    |
[INFO] [stdout] 72 |         impl StrOpt {
[INFO] [stdout]    |         ----------- method in this implementation
[INFO] [stdout] 73 |             fn get_value(&self) -> &String {
[INFO] [stdout]    |                ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cache` is never constructed
[INFO] [stdout]    --> src/bin/ownership_3.rs:104:8
[INFO] [stdout]     |
[INFO] [stdout] 104 | struct Cache<F, K, V>
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `get_value` are never used
[INFO] [stdout]    --> src/bin/ownership_3.rs:119:8
[INFO] [stdout]     |
[INFO] [stdout] 113 | / impl<F, K, V> Cache<F, K, V>
[INFO] [stdout] 114 | | where
[INFO] [stdout] 115 | |     F: Fn(&K) -> V,
[INFO] [stdout] 116 | |     K: Eq + Hash + Clone,
[INFO] [stdout] 117 | |     V: Debug,
[INFO] [stdout]     | |_____________- associated items in this implementation
[INFO] [stdout] 118 |   {
[INFO] [stdout] 119 |       fn new(calc: F) -> Self {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 126 |       fn get_value(&mut self, arg: K) -> &V {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `path`
[INFO] [stdout]  --> src/bin/error_r.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::{fs, path};
[INFO] [stdout]   |               ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ops::Not`
[INFO] [stdout]  --> src/bin/error_r.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{fs::File, ops::Not};
[INFO] [stdout]   |                     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]  --> src/bin/vector_2.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let m = String::new();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]  --> src/bin/vector_2.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let l = "test".to_string();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ll`
[INFO] [stdout]  --> src/bin/vector_2.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let ll = String::from("test");
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_ll`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]  --> src/bin/vector_2.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let hello = String::from("السلام عليكم");
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]  --> src/bin/vector_2.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let hello = String::from("Dobrý den");
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/bin/vector_2.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let hello = String::from("Hello");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/bin/vector_2.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let hello = String::from("שָׁלוֹם");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/bin/vector_2.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let hello = String::from("नमस्ते");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/bin/vector_2.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let hello = String::from("こんにちは");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/bin/vector_2.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let hello = String::from("안녕하세요");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/bin/vector_2.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let hello = String::from("你好");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/bin/vector_2.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let hello = String::from("Olá");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/bin/vector_2.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let hello = String::from("Здравствуйте");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/bin/vector_2.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let hello = String::from("Hola");
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/chan_1.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | /     s.send(Animal::Cat {
[INFO] [stdout] 25 | |         age: 8,
[INFO] [stdout] 26 | |         name: "zaizai".to_string(),
[INFO] [stdout] 27 | |     });
[INFO] [stdout]    | |______^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let _ = s.send(Animal::Cat {
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-demo` (bin "async_echo_server" test) due to 1 previous error; 1 warning emitted
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/chan_1.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     s.send(Animal::Dog("qdd"));
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let _ = s.send(Animal::Dog("qdd"));
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/chan_1.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 42 |         s.send("t");
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 42 |         let _ = s.send("t");
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/chan_1.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |         s.send("a");
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 44 |         let _ = s.send("a");
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/chan_1.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |         s.send("b");
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let _ = s.send("b");
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/chan_1.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         s.send("t");
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let _ = s.send("t");
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/chan_1.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |         s.send("a");
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 62 |         let _ = s.send("a");
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/chan_1.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |         s.send("b");
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 63 |         let _ = s.send("b");
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/bin/chan_1.rs:101:9
[INFO] [stdout]     |
[INFO] [stdout] 101 |         s2.send(str);
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 101 |         let _ = s2.send(str);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/bin/chan_1.rs:116:9
[INFO] [stdout]     |
[INFO] [stdout] 116 |         s.send(str);
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 116 |         let _ = s.send(str);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]  --> src/bin/async_demo_close.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 | async fn test() {
[INFO] [stdout]   |          ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: useless conversion to the same type: `bytes::Bytes`
[INFO] [stdout]   --> src/bin/async_echo_server.rs:44:37
[INFO] [stdout]    |
[INFO] [stdout] 44 |                         Frame::Bulk(val.clone().into())
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this method call relies on the `impl<T> Into<T> for T` blanket implementation and type inference, which is a semver hazard as a new `impl Into<_>` that affects your type might be added in the future causing type inference errors
[INFO] [stdout]    = note: `#[deny(self_type_conversion)]` on by default
[INFO] [stdout] help: consider removing the conversion call
[INFO] [stdout]    |
[INFO] [stdout] 44 -                         Frame::Bulk(val.clone().into())
[INFO] [stdout] 44 +                         Frame::Bulk(val.clone())
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 44 -                         Frame::Bulk(val.clone().into())
[INFO] [stdout] 44 +                         Frame::Bulk(<bytes::Bytes as Into<_>>::into(val.clone()))
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/bin/proc_marcro_1.rs:11:17
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct SomeData(u32, String);
[INFO] [stdout]    |        -------- ^^^  ^^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout]    = note: `SomeData` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `data` are never read
[INFO] [stdout]   --> src/bin/proc_marcro_1.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct User {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 15 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 16 |     data: SomeData,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> src/bin/error_r.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let v = vec![1, 2, 3, 4];
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::num`
[INFO] [stdout]  --> src/bin/closure_4.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::num;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/ownership_3.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let mut str_opt2 = &StrOpt {
[INFO] [stdout]    |             ----^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/ownership_3.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let v = match &str_opt.value {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/ownership_3.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let v = match str_opt.value {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/ownership_3.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |         let v = match str_opt.value {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/ownership_3.rs:60:13
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let v = match s.raw_int {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str_opt2`
[INFO] [stdout]   --> src/bin/ownership_3.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let mut str_opt2 = &StrOpt {
[INFO] [stdout]    |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_opt2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]    --> src/bin/ownership_3.rs:134:21
[INFO] [stdout]     |
[INFO] [stdout] 134 |                 let z = (self.calc)(&arg);
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_value` is never used
[INFO] [stdout]   --> src/bin/ownership_3.rs:73:16
[INFO] [stdout]    |
[INFO] [stdout] 72 |         impl StrOpt {
[INFO] [stdout]    |         ----------- method in this implementation
[INFO] [stdout] 73 |             fn get_value(&self) -> &String {
[INFO] [stdout]    |                ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cache` is never constructed
[INFO] [stdout]    --> src/bin/ownership_3.rs:104:8
[INFO] [stdout]     |
[INFO] [stdout] 104 | struct Cache<F, K, V>
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `get_value` are never used
[INFO] [stdout]    --> src/bin/ownership_3.rs:119:8
[INFO] [stdout]     |
[INFO] [stdout] 113 | / impl<F, K, V> Cache<F, K, V>
[INFO] [stdout] 114 | | where
[INFO] [stdout] 115 | |     F: Fn(&K) -> V,
[INFO] [stdout] 116 | |     K: Eq + Hash + Clone,
[INFO] [stdout] 117 | |     V: Debug,
[INFO] [stdout]     | |_____________- associated items in this implementation
[INFO] [stdout] 118 |   {
[INFO] [stdout] 119 |       fn new(calc: F) -> Self {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 126 |       fn get_value(&mut self, arg: K) -> &V {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `page_title_2` is never used
[INFO] [stdout]   --> src/bin/async_demo_1.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn page_title_2(url: &str) -> impl Future<Output = Option<String>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> src/bin/error_r.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |             other => panic!("error"),
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `Other`
[INFO] [stdout]    |
[INFO] [stdout] 18 -             other => panic!("error"),
[INFO] [stdout] 18 +             std::io::ErrorKind::Other => panic!("error"),
[INFO] [stdout]    |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 18 |             _other => panic!("error"),
[INFO] [stdout]    |             +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_recv` is never used
[INFO] [stdout]  --> src/bin/async_stream_1.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 | async fn send_recv() {
[INFO] [stdout]   |          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_with_next` is never used
[INFO] [stdout]   --> src/bin/async_stream_1.rs:20:10
[INFO] [stdout]    |
[INFO] [stdout] 20 | async fn sum_with_next(mut stream: Pin<&mut dyn Stream<Item = i32>>) -> i32 {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_with_try_next` is never used
[INFO] [stdout]   --> src/bin/async_stream_1.rs:29:10
[INFO] [stdout]    |
[INFO] [stdout] 29 | async fn sum_with_try_next(
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_int`
[INFO] [stdout]   --> src/bin/match_r.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let some_int = Some(32);
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_int`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_char`
[INFO] [stdout]   --> src/bin/match_r.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let some_char = Some('b');
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_char`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `null_int`
[INFO] [stdout]   --> src/bin/match_r.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let null_int: Option<i32> = None;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_null_int`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]  --> src/bin/match_r.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum Message {
[INFO] [stdout]   |      ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind` is never used
[INFO] [stdout]  --> src/bin/match_r.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum IpAddrKind {
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/bin/match_r.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 |     V4(String),
[INFO] [stdout]    |     -- ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 16 -     V4(String),
[INFO] [stdout] 16 +     V4(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `V6` is never constructed
[INFO] [stdout]   --> src/bin/match_r.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum IpAddr {
[INFO] [stdout]    |      ------ variant in this enum
[INFO] [stdout] 16 |     V4(String),
[INFO] [stdout] 17 |     V6(String),
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `USA` and `Japan` are never constructed
[INFO] [stdout]   --> src/bin/match_r.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum Holder {
[INFO] [stdout]    |      ------ variants in this enum
[INFO] [stdout] 22 |     China,
[INFO] [stdout] 23 |     USA,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 24 |     Japan,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Holder` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `BTC` and `ETH` are never constructed
[INFO] [stdout]   --> src/bin/match_r.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | enum Coin {
[INFO] [stdout]    |      ---- variants in this enum
[INFO] [stdout] 28 |     BTC,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 29 |     ETH,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/bin/struct_r.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Point(u32, u32);
[INFO] [stdout]   |        ----- ^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 9 - struct Point(u32, u32);
[INFO] [stdout] 9 + struct Point((), u32);
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_w` and `area2` are never used
[INFO] [stdout]   --> src/bin/struct_r.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl Rectangle {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] 18 |     fn get_w(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     fn area2(self, c: u32) -> u32 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/bin/struct_r.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn build_user(email: String, name: String, active: bool) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_recv` is never used
[INFO] [stdout]  --> src/bin/async_stream_1.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 | async fn send_recv() {
[INFO] [stdout]   |          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_with_next` is never used
[INFO] [stdout]   --> src/bin/async_stream_1.rs:20:10
[INFO] [stdout]    |
[INFO] [stdout] 20 | async fn sum_with_next(mut stream: Pin<&mut dyn Stream<Item = i32>>) -> i32 {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_with_try_next` is never used
[INFO] [stdout]   --> src/bin/async_stream_1.rs:29:10
[INFO] [stdout]    |
[INFO] [stdout] 29 | async fn sum_with_try_next(
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::net::TcpStream`
[INFO] [stdout]  --> src/bin/async_io.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use tokio::net::TcpStream;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/async_io.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut reader = b"hello";
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b69b7d02cd39b493eb910f443b963442aaf6c001e39875e3277131ff86700819", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b69b7d02cd39b493eb910f443b963442aaf6c001e39875e3277131ff86700819", kill_on_drop: false }`
[INFO] [stdout] b69b7d02cd39b493eb910f443b963442aaf6c001e39875e3277131ff86700819
