[INFO] cloning repository https://github.com/baij930312/axum_demo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/baij930312/axum_demo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbaij930312%2Faxum_demo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbaij930312%2Faxum_demo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d2f6d4942f6a27c73df923063b6a51d76651cd4b
[INFO] checking baij930312/axum_demo against 8006091eb71ae7d9e9bccb66c6122c9d68af4466 for pr-129249-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbaij930312%2Faxum_demo" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/baij930312/axum_demo
[INFO] finished tweaking git repo https://github.com/baij930312/axum_demo
[INFO] tweaked toml for git repo https://github.com/baij930312/axum_demo written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/baij930312/axum_demo on toolchain 8006091eb71ae7d9e9bccb66c6122c9d68af4466
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8006091eb71ae7d9e9bccb66c6122c9d68af4466" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/baij930312/axum_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" "+8006091eb71ae7d9e9bccb66c6122c9d68af4466" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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] 4acb086b5a44f11d9e817e1a3dff10695c65b5d214f17e75fdc89b3a8a2ac3a1
[INFO] running `Command { std: "docker" "start" "4acb086b5a44f11d9e817e1a3dff10695c65b5d214f17e75fdc89b3a8a2ac3a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4acb086b5a44f11d9e817e1a3dff10695c65b5d214f17e75fdc89b3a8a2ac3a1", 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" "4acb086b5a44f11d9e817e1a3dff10695c65b5d214f17e75fdc89b3a8a2ac3a1" "/opt/rustwide/cargo-home/bin/cargo" "+8006091eb71ae7d9e9bccb66c6122c9d68af4466" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4acb086b5a44f11d9e817e1a3dff10695c65b5d214f17e75fdc89b3a8a2ac3a1", 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" "4acb086b5a44f11d9e817e1a3dff10695c65b5d214f17e75fdc89b3a8a2ac3a1" "/opt/rustwide/cargo-home/bin/cargo" "+8006091eb71ae7d9e9bccb66c6122c9d68af4466" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `core::num`
[INFO] [stdout]  --> examples/sort.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use core::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: unused import: `layer::layer_fn`
[INFO] [stdout]   --> examples/middleware.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 | use tower::{layer::layer_fn, Service, ServiceBuilder};
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bubble` is never used
[INFO] [stdout]   --> examples/sort.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn bubble(mut v: Vec<i32>) -> Vec<i32> {
[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 `fast_sort` is never used
[INFO] [stdout]   --> examples/sort.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn fast_sort(v: &mut Vec<i32>, left: usize, right: usize) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `position` is never used
[INFO] [stdout]   --> examples/sort.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn position(v: &mut Vec<i32>, left: usize, right: usize) -> usize {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_kth_largest` is never used
[INFO] [stdout]   --> examples/sort.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn find_kth_largest(v: &mut Vec<i32>, left: usize, right: usize, k: usize) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `position_k` is never used
[INFO] [stdout]   --> examples/sort.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn position_k(v: &mut Vec<i32>, left: usize, right: usize, k: usize) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `merge_sort` is never used
[INFO] [stdout]   --> examples/sort.rs:75:4
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn merge_sort(v: &mut Vec<i32>, left: usize, right: usize) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/tree.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut n1 = TreeNode::new(1);
[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]   --> examples/tree.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let mut n2 = TreeNode::new(2);
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/tree.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut n3 = TreeNode {
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/tree.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut n9 = TreeNode::new(9);
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/tree.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let mut n4 = TreeNode {
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/tree.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let mut n5 = TreeNode::new(5);
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/tree.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let mut n6 = TreeNode {
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/tree.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut n7 = TreeNode {
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `sync::oneshot`
[INFO] [stdout]  --> examples/select.rs:3:33
[INFO] [stdout]   |
[INFO] [stdout] 3 | use tokio::{select, sync::mpsc, sync::oneshot};
[INFO] [stdout]   |                                 ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `preorder` is never used
[INFO] [stdout]   --> examples/tree.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn preorder(root: Option<Rc<RefCell<TreeNode>>>, v: &mut Vec<i32>) {
[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 `postorder` is never used
[INFO] [stdout]   --> examples/tree.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn postorder(root: Option<Rc<RefCell<TreeNode>>>, v: &mut Vec<i32>) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inorder` is never used
[INFO] [stdout]   --> examples/tree.rs:85:4
[INFO] [stdout]    |
[INFO] [stdout] 85 | fn inorder(root: Option<Rc<RefCell<TreeNode>>>, v: &mut Vec<i32>) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `preorder_traversal` is never used
[INFO] [stdout]   --> examples/tree.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn preorder_traversal(root: Option<Rc<RefCell<TreeNode>>>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `inorder_traversal` is never used
[INFO] [stdout]    --> examples/tree.rs:114:4
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn inorder_traversal(root: Option<Rc<RefCell<TreeNode>>>) -> Vec<i32> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `postorder_traversal` is never used
[INFO] [stdout]    --> examples/tree.rs:132:4
[INFO] [stdout]     |
[INFO] [stdout] 132 | fn postorder_traversal(root: Option<Rc<RefCell<TreeNode>>>) -> Vec<i32> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `levelorder` is never used
[INFO] [stdout]    --> examples/tree.rs:152:4
[INFO] [stdout]     |
[INFO] [stdout] 152 | fn levelorder(root: Option<Rc<RefCell<TreeNode>>>) -> Vec<i32> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dfs` is never used
[INFO] [stdout]    --> examples/tree.rs:168:4
[INFO] [stdout]     |
[INFO] [stdout] 168 | fn dfs(node: Option<Rc<RefCell<TreeNode>>>, v: &mut Vec<Option<Rc<RefCell<TreeNode>>>>) {
[INFO] [stdout]     |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `dfs_traversal` is never used
[INFO] [stdout]    --> examples/tree.rs:190:4
[INFO] [stdout]     |
[INFO] [stdout] 190 | fn dfs_traversal(node: Option<Rc<RefCell<TreeNode>>>) -> Vec<i32> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_max_depth_bfs` is never used
[INFO] [stdout]    --> examples/tree.rs:217:4
[INFO] [stdout]     |
[INFO] [stdout] 217 | fn find_max_depth_bfs(node: Option<Rc<RefCell<TreeNode>>>) -> i32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `merge_k_lists` is never used
[INFO] [stdout]   --> examples/merge_two_list.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn merge_k_lists(lists: Vec<Option<Box<Node>>>) -> Option<Box<Node>> {
[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 `remove` is never used
[INFO] [stdout]   --> examples/heap.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn remove(nums: &mut Vec<i32>) -> Option<i32> {
[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: `handle1`
[INFO] [stdout]   --> examples/select.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let handle1 = tokio::spawn(async move {
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_handle1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `handle2`
[INFO] [stdout]   --> examples/select.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |     let handle2 = tokio::spawn(async move {
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_handle2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `handle3`
[INFO] [stdout]   --> examples/select.rs:72:9
[INFO] [stdout]    |
[INFO] [stdout] 72 |     let handle3 = tokio::spawn(async move {
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_handle3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `action` is never used
[INFO] [stdout]  --> examples/select.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 | async fn action(input: Option<i32>) -> 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: field `val` is never read
[INFO] [stdout]  --> examples/rm_nth_from_end_of_list.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Node {
[INFO] [stdout]   |        ---- field in this struct
[INFO] [stdout] 3 |     val: i32,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has derived impls for the traits `Clone` and `Debug`, but these are 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: function `remove_from_end` is never used
[INFO] [stdout]   --> examples/rm_nth_from_end_of_list.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn remove_from_end(head: Option<Box<Node>>, n: i32) -> Option<Box<Node>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::vec`
[INFO] [stdout]  --> examples/echo-server-copy.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::vec;
[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: `AsyncReadExt` and `AsyncWriteExt`
[INFO] [stdout]  --> examples/echo-server-copy.rs:4:16
[INFO] [stdout]   |
[INFO] [stdout] 4 |     io::{self, AsyncReadExt, AsyncWriteExt},
[INFO] [stdout]   |                ^^^^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> examples/middleware.rs:176:24
[INFO] [stdout]     |
[INFO] [stdout] 176 |     fn call(&mut self, mut req: Request<Body>) -> Self::Future {
[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: struct `MyMiddleware` is never constructed
[INFO] [stdout]    --> examples/middleware.rs:159:8
[INFO] [stdout]     |
[INFO] [stdout] 159 | struct MyMiddleware<S> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `val` is never read
[INFO] [stdout]  --> examples/reverse_list.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Node {
[INFO] [stdout]   |        ---- field in this struct
[INFO] [stdout] 3 |     val: i32,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` has derived impls for the traits `Clone` and `Debug`, but these are 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: function `reverse` is never used
[INFO] [stdout]   --> examples/reverse_list.rs:52:4
[INFO] [stdout]    |
[INFO] [stdout] 52 | fn reverse(head: Option<Box<Node>>) -> Option<Box<Node>> {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::sync::Notify`
[INFO] [stdout]  --> examples/delay.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use tokio::sync::Notify;
[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 variable: `bbb`
[INFO] [stdout]    --> examples/min_stack.rs:181:9
[INFO] [stdout]     |
[INFO] [stdout] 181 |     let bbb = aaa.clone();
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_bbb`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Student` is never constructed
[INFO] [stdout]   --> examples/min_stack.rs:96:8
[INFO] [stdout]    |
[INFO] [stdout] 96 | struct Student {
[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 `Color` is never constructed
[INFO] [stdout]    --> examples/min_stack.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout] 101 | struct Color(i32, i32, i32);
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ColorNoParam` is never used
[INFO] [stdout]    --> examples/min_stack.rs:104:6
[INFO] [stdout]     |
[INFO] [stdout] 104 | enum ColorNoParam {
[INFO] [stdout]     |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `distinct` is never used
[INFO] [stdout]    --> examples/min_stack.rs:110:4
[INFO] [stdout]     |
[INFO] [stdout] 110 | fn distinct(mut sorted_arr: Vec<i32>) -> i32 {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_one` is never used
[INFO] [stdout]    --> examples/min_stack.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn plus_one(mut num_vec: Vec<i32>) {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: unused dependency `axum`
[INFO] [stderr]   --> Cargo.toml:11:15
[INFO] [stderr]    |
[INFO] [stderr] 11 | [dependencies.axum]
[INFO] [stderr]    |               ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `cargo::unused_dependencies` is set to `warn` by default
[INFO] [stderr] help: consider removing the dependency on `axum`
[INFO] [stderr] help: to still use for development builds, move to `dev-dependencies`
[INFO] [stderr] warning: unused dependency `enum-iterator`
[INFO] [stderr]  --> Cargo.toml:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | enum-iterator = "*"
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: consider removing the dependency on `enum-iterator`
[INFO] [stderr] warning: unused dependency `futures`
[INFO] [stderr]   --> Cargo.toml:15:15
[INFO] [stderr]    |
[INFO] [stderr] 15 | [dependencies.futures]
[INFO] [stderr]    |               ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] help: consider removing the dependency on `futures`
[INFO] [stderr] help: to still use for development builds, move to `dev-dependencies`
[INFO] [stderr] warning: unused dependency `int-enum`
[INFO] [stderr]  --> Cargo.toml:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | int-enum = "*"
[INFO] [stderr]   | ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: consider removing the dependency on `int-enum`
[INFO] [stderr] warning: unused dependency `mini-redis`
[INFO] [stderr]  --> Cargo.toml:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | mini-redis = "0.4"
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: consider removing the dependency on `mini-redis`
[INFO] [stderr] help: to still use for development builds, move to `dev-dependencies`
[INFO] [stderr] warning: `web` (manifest) generated 5 warnings
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 26s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: hdrhistogram v6.3.4, nom v4.2.3, nom v6.1.2
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 3`
[INFO] running `Command { std: "docker" "inspect" "4acb086b5a44f11d9e817e1a3dff10695c65b5d214f17e75fdc89b3a8a2ac3a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4acb086b5a44f11d9e817e1a3dff10695c65b5d214f17e75fdc89b3a8a2ac3a1", kill_on_drop: false }`
[INFO] [stdout] 4acb086b5a44f11d9e817e1a3dff10695c65b5d214f17e75fdc89b3a8a2ac3a1
