[INFO] cloning repository https://github.com/Sithaarth24/rust-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Sithaarth24/rust-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSithaarth24%2Frust-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSithaarth24%2Frust-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ededf5b662f92022fe970d77844af5d8db5826b8
[INFO] checking Sithaarth24/rust-practice against try#b28cc4eb48a6415b914e8ad0308be255ff8d73ed for pr-156508
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSithaarth24%2Frust-practice" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Sithaarth24/rust-practice
[INFO] finished tweaking git repo https://github.com/Sithaarth24/rust-practice
[INFO] tweaked toml for git repo https://github.com/Sithaarth24/rust-practice written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Sithaarth24/rust-practice on toolchain b28cc4eb48a6415b914e8ad0308be255ff8d73ed
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b28cc4eb48a6415b914e8ad0308be255ff8d73ed" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Sithaarth24/rust-practice 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" "+b28cc4eb48a6415b914e8ad0308be255ff8d73ed" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking Sithaarth24/rust-practice against try#b28cc4eb48a6415b914e8ad0308be255ff8d73ed for pr-156508
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSithaarth24%2Frust-practice" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Sithaarth24/rust-practice
[INFO] finished tweaking git repo https://github.com/Sithaarth24/rust-practice
[INFO] tweaked toml for git repo https://github.com/Sithaarth24/rust-practice written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Sithaarth24/rust-practice on toolchain b28cc4eb48a6415b914e8ad0308be255ff8d73ed
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b28cc4eb48a6415b914e8ad0308be255ff8d73ed" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Sithaarth24/rust-practice 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" "+b28cc4eb48a6415b914e8ad0308be255ff8d73ed" "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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+b28cc4eb48a6415b914e8ad0308be255ff8d73ed" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fc6dcf7ac318003c51f98078f6c7f37a0ea2b416a2f00fb40c512382b1001152
[INFO] running `Command { std: "docker" "start" "-a" "fc6dcf7ac318003c51f98078f6c7f37a0ea2b416a2f00fb40c512382b1001152", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fc6dcf7ac318003c51f98078f6c7f37a0ea2b416a2f00fb40c512382b1001152", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc6dcf7ac318003c51f98078f6c7f37a0ea2b416a2f00fb40c512382b1001152", kill_on_drop: false }`
[INFO] [stdout] fc6dcf7ac318003c51f98078f6c7f37a0ea2b416a2f00fb40c512382b1001152
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+b28cc4eb48a6415b914e8ad0308be255ff8d73ed" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] da6860af5b6ac1aa22c594afeffc4779e8867939cc69f561e631f084e94f0c4e
[INFO] running `Command { std: "docker" "start" "-a" "da6860af5b6ac1aa22c594afeffc4779e8867939cc69f561e631f084e94f0c4e", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_proj v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `cmp::Ordering::*`
[INFO] [stdout]  --> src/practice/binary_search_tree.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{cmp::Ordering::*, fmt::Display};
[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: `RefCell`
[INFO] [stdout]  --> src/practice/timer.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `cell::RefCell` and `self`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     cell::RefCell,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 5 |     collections::{self, LinkedList},
[INFO] [stdout]   |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `str_split::*`
[INFO] [stdout]  --> src/main.rs:8:71
[INFO] [stdout]   |
[INFO] [stdout] 8 | use crate::{linked_list::*, practice::binary_search_tree::BinaryTree, str_split::*};
[INFO] [stdout]   |                                                                       ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cmp::Ordering::*`
[INFO] [stdout]  --> src/practice/binary_search_tree.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{cmp::Ordering::*, fmt::Display};
[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: `RefCell`
[INFO] [stdout]  --> src/practice/timer.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `cell::RefCell` and `self`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     cell::RefCell,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 5 |     collections::{self, LinkedList},
[INFO] [stdout]   |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `str_split::*`
[INFO] [stdout]  --> src/main.rs:8:71
[INFO] [stdout]   |
[INFO] [stdout] 8 | use crate::{linked_list::*, practice::binary_search_tree::BinaryTree, str_split::*};
[INFO] [stdout]   |                                                                       ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/practice/binary_search_tree.rs:59:19
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fn largest_v3(mut root1: N<T>) -> (N<T>, T) {
[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/main.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let mut ll = LinkedList::<u32>::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/practice/binary_search_tree.rs:43:8
[INFO] [stdout]     |
[INFO] [stdout]  24 | / impl<T> BinaryTree<T>
[INFO] [stdout]  25 | | where
[INFO] [stdout]  26 | |     T: Copy + PartialOrd + Display,
[INFO] [stdout]     | |___________________________________- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  43 |       fn largest_v4(root: &mut N<T>) -> T {
[INFO] [stdout]     |          ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  59 |       fn largest_v3(mut root1: N<T>) -> (N<T>, T) {
[INFO] [stdout]     |          ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  74 |       unsafe fn largest_v2<'a>(root: *mut Node<T>, parent: *mut Node<T>) -> &'a T {
[INFO] [stdout]     |                 ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  86 |       fn largest_v1(root: &Box<Node<T>>) -> &T {
[INFO] [stdout]     |          ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  93 |       fn delete_node_v2(mut root: Box<Node<T>>, val: &T) -> N<T> {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 129 |       fn delete_node_v1(mut root: Box<Node<T>>, val: &T) -> N<T> {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 177 |       pub fn delete_v1(&mut self, val: T) {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 183 |       pub fn delete_v2(&mut self, val: 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: struct `Cache` is never constructed
[INFO] [stdout]  --> src/practice/cache.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Cache<K, V> {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `from_vec`, and `get_or_insert` are never used
[INFO] [stdout]   --> src/practice/cache.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout]  7 | / impl<K, V> Cache<K, V>
[INFO] [stdout]  8 | | where
[INFO] [stdout]  9 | |     K: Eq + Clone + Hash,
[INFO] [stdout] 10 | |     V: Clone,
[INFO] [stdout]    | |_____________- associated items in this implementation
[INFO] [stdout] 11 |   {
[INFO] [stdout] 12 |       pub fn new() -> Self {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 18 |       pub fn from_vec(kv: Vec<(K, V)>) -> Self {
[INFO] [stdout]    |              ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       pub fn get_or_insert(&self, key: K, val: V) -> Option<V> {
[INFO] [stdout]    |              ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LinkedList` is never constructed
[INFO] [stdout]   --> src/practice/linked_list.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct LinkedList<T> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push`, and `pop` are never used
[INFO] [stdout]   --> src/practice/linked_list.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<T> LinkedList<T> {
[INFO] [stdout]    | --------------------- associated items in this implementation
[INFO] [stdout] 17 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub fn push(&mut self, val: T) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn pop(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `push_front` and `pop_front` are never used
[INFO] [stdout]   --> src/practice/linked_list.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl<T> LinkedListV2<T> {
[INFO] [stdout]    | ----------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 47 |     pub fn push_front(&mut self, val: T) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 71 |     pub fn pop_front(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `StrSplit` is never constructed
[INFO] [stdout]   --> src/practice/str_split.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub struct StrSplit<'a> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/practice/str_split.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | impl<'a> StrSplit<'a> {
[INFO] [stdout]    | --------------------- associated function in this implementation
[INFO] [stdout] 38 |     pub fn new(line: Option<&'a str>, ch: char) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `TimerState` is never used
[INFO] [stdout]  --> src/practice/timer.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum TimerState {
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Timer` is never constructed
[INFO] [stdout]  --> src/practice/timer.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct Timer {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `tick`, `toggle_state`, `reset`, `get_ticks`, and `is_running` are never used
[INFO] [stdout]   --> src/practice/timer.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Timer {
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 15 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn tick(&self) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     pub fn toggle_state(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn reset(&self) {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     pub fn get_ticks(&self) -> u32 {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 45 |     pub fn is_running(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/practice/user.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `add_roles` are never used
[INFO] [stdout]   --> src/practice/user.rs:9:12
[INFO] [stdout]    |
[INFO] [stdout]  8 | impl User {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout]  9 |     pub fn new(name: String, initial_roles: Vec<String>) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn add_roles(&self, role: String) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/practice/binary_search_tree.rs:59:19
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fn largest_v3(mut root1: N<T>) -> (N<T>, T) {
[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/main.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let mut ll = LinkedList::<u32>::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/practice/binary_search_tree.rs:43:8
[INFO] [stdout]     |
[INFO] [stdout]  24 | / impl<T> BinaryTree<T>
[INFO] [stdout]  25 | | where
[INFO] [stdout]  26 | |     T: Copy + PartialOrd + Display,
[INFO] [stdout]     | |___________________________________- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  43 |       fn largest_v4(root: &mut N<T>) -> T {
[INFO] [stdout]     |          ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  59 |       fn largest_v3(mut root1: N<T>) -> (N<T>, T) {
[INFO] [stdout]     |          ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  74 |       unsafe fn largest_v2<'a>(root: *mut Node<T>, parent: *mut Node<T>) -> &'a T {
[INFO] [stdout]     |                 ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  86 |       fn largest_v1(root: &Box<Node<T>>) -> &T {
[INFO] [stdout]     |          ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  93 |       fn delete_node_v2(mut root: Box<Node<T>>, val: &T) -> N<T> {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 129 |       fn delete_node_v1(mut root: Box<Node<T>>, val: &T) -> N<T> {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 177 |       pub fn delete_v1(&mut self, val: T) {
[INFO] [stdout]     |              ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 183 |       pub fn delete_v2(&mut self, val: 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: struct `Cache` is never constructed
[INFO] [stdout]  --> src/practice/cache.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Cache<K, V> {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `from_vec`, and `get_or_insert` are never used
[INFO] [stdout]   --> src/practice/cache.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout]  7 | / impl<K, V> Cache<K, V>
[INFO] [stdout]  8 | | where
[INFO] [stdout]  9 | |     K: Eq + Clone + Hash,
[INFO] [stdout] 10 | |     V: Clone,
[INFO] [stdout]    | |_____________- associated items in this implementation
[INFO] [stdout] 11 |   {
[INFO] [stdout] 12 |       pub fn new() -> Self {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 18 |       pub fn from_vec(kv: Vec<(K, V)>) -> Self {
[INFO] [stdout]    |              ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |       pub fn get_or_insert(&self, key: K, val: V) -> Option<V> {
[INFO] [stdout]    |              ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LinkedList` is never constructed
[INFO] [stdout]   --> src/practice/linked_list.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct LinkedList<T> {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push`, and `pop` are never used
[INFO] [stdout]   --> src/practice/linked_list.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<T> LinkedList<T> {
[INFO] [stdout]    | --------------------- associated items in this implementation
[INFO] [stdout] 17 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub fn push(&mut self, val: T) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn pop(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `push_front` and `pop_front` are never used
[INFO] [stdout]   --> src/practice/linked_list.rs:47:12
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl<T> LinkedListV2<T> {
[INFO] [stdout]    | ----------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 47 |     pub fn push_front(&mut self, val: T) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 71 |     pub fn pop_front(&mut self) -> Option<T> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `StrSplit` is never constructed
[INFO] [stdout]   --> src/practice/str_split.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub struct StrSplit<'a> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/practice/str_split.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 37 | impl<'a> StrSplit<'a> {
[INFO] [stdout]    | --------------------- associated function in this implementation
[INFO] [stdout] 38 |     pub fn new(line: Option<&'a str>, ch: char) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `TimerState` is never used
[INFO] [stdout]  --> src/practice/timer.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum TimerState {
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Timer` is never constructed
[INFO] [stdout]  --> src/practice/timer.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct Timer {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `tick`, `toggle_state`, `reset`, `get_ticks`, and `is_running` are never used
[INFO] [stdout]   --> src/practice/timer.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Timer {
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 15 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn tick(&self) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     pub fn toggle_state(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn reset(&self) {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     pub fn get_ticks(&self) -> u32 {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 45 |     pub fn is_running(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/practice/user.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `add_roles` are never used
[INFO] [stdout]   --> src/practice/user.rs:9:12
[INFO] [stdout]    |
[INFO] [stdout]  8 | impl User {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout]  9 |     pub fn new(name: String, initial_roles: Vec<String>) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn add_roles(&self, role: String) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `Command { std: "docker" "inspect" "da6860af5b6ac1aa22c594afeffc4779e8867939cc69f561e631f084e94f0c4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da6860af5b6ac1aa22c594afeffc4779e8867939cc69f561e631f084e94f0c4e", kill_on_drop: false }`
[INFO] [stdout] da6860af5b6ac1aa22c594afeffc4779e8867939cc69f561e631f084e94f0c4e
