[INFO] cloning repository https://github.com/Leonqn/leetcode-solutions
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Leonqn/leetcode-solutions" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeonqn%2Fleetcode-solutions", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeonqn%2Fleetcode-solutions'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 464b43cf4432d3b82299ea2656b9b4bace1e3b90
[INFO] checking Leonqn/leetcode-solutions against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeonqn%2Fleetcode-solutions" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Leonqn/leetcode-solutions on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Leonqn/leetcode-solutions
[INFO] finished tweaking git repo https://github.com/Leonqn/leetcode-solutions
[INFO] tweaked toml for git repo https://github.com/Leonqn/leetcode-solutions written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/Leonqn/leetcode-solutions already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3a85ba7ddfb000266441771d8b3837c9babe07662ead7a638a872ff6ae554291
[INFO] running `Command { std: "docker" "start" "-a" "3a85ba7ddfb000266441771d8b3837c9babe07662ead7a638a872ff6ae554291", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3a85ba7ddfb000266441771d8b3837c9babe07662ead7a638a872ff6ae554291", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a85ba7ddfb000266441771d8b3837c9babe07662ead7a638a872ff6ae554291", kill_on_drop: false }`
[INFO] [stdout] 3a85ba7ddfb000266441771d8b3837c9babe07662ead7a638a872ff6ae554291
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7ffb14b245c0bb36b0853d51cfdd5ce4ee697ba2d0216ffdd76ec3fe2e13f7e9
[INFO] running `Command { std: "docker" "start" "-a" "7ffb14b245c0bb36b0853d51cfdd5ce4ee697ba2d0216ffdd76ec3fe2e13f7e9", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Checking top-questions v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/medium/array_and_strings.rs (1 fix)
[INFO] [stdout] warning: struct is never constructed: `Solution`
[INFO] [stdout]  --> src/main.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_zeroes`
[INFO] [stdout]   --> src/medium/array_and_strings.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub fn set_zeroes(matrix: &mut Vec<Vec<i32>>) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `group_anagrams`
[INFO] [stdout]   --> src/medium/array_and_strings.rs:76:12
[INFO] [stdout]    |
[INFO] [stdout] 76 |     pub fn group_anagrams(strs: Vec<String>) -> Vec<Vec<String>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_ch_idx`
[INFO] [stdout]   --> src/medium/array_and_strings.rs:77:12
[INFO] [stdout]    |
[INFO] [stdout] 77 |         fn get_ch_idx(c: char) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `length_of_longest_substring`
[INFO] [stdout]    --> src/medium/array_and_strings.rs:125:12
[INFO] [stdout]     |
[INFO] [stdout] 125 |     pub fn length_of_longest_substring(s: String) -> i32 {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `increasing_triplet`
[INFO] [stdout]    --> src/medium/array_and_strings.rs:171:12
[INFO] [stdout]     |
[INFO] [stdout] 171 |     pub fn increasing_triplet(_nums: Vec<i32>) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/medium/linked_list.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn new(val: i32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_iter`
[INFO] [stdout]   --> src/medium/linked_list.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 |     fn from_iter(i: impl IntoIterator<Item = i32>) -> Option<Box<Self>> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_two_numbers`
[INFO] [stdout]   --> src/medium/linked_list.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn add_two_numbers(
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum`
[INFO] [stdout]   --> src/medium/linked_list.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |         fn sum(
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `odd_even_list`
[INFO] [stdout]   --> src/medium/linked_list.rs:88:12
[INFO] [stdout]    |
[INFO] [stdout] 88 |     pub fn odd_even_list(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/medium/graphs.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn new(val: i32) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_iterator`
[INFO] [stdout]   --> src/medium/graphs.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn from_iterator(
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `inorder_traversal`
[INFO] [stdout]   --> src/medium/graphs.rs:57:12
[INFO] [stdout]    |
[INFO] [stdout] 57 |     pub fn inorder_traversal(root: Option<Rc<RefCell<TreeNode>>>) -> Vec<i32> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rec`
[INFO] [stdout]   --> src/medium/graphs.rs:58:12
[INFO] [stdout]    |
[INFO] [stdout] 58 |         fn rec(root: Option<&RefCell<TreeNode>>, result: &mut Vec<i32>) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `zigzag_level_order`
[INFO] [stdout]   --> src/medium/graphs.rs:96:12
[INFO] [stdout]    |
[INFO] [stdout] 96 |     pub fn zigzag_level_order(root: Option<Rc<RefCell<TreeNode>>>) -> Vec<Vec<i32>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `zigzag`
[INFO] [stdout]   --> src/medium/graphs.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 97 |         fn zigzag(root: Option<&RefCell<TreeNode>>, result: &mut Vec<Vec<i32>>, level: usize) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `build_tree`
[INFO] [stdout]    --> src/medium/graphs.rs:151:12
[INFO] [stdout]     |
[INFO] [stdout] 151 |     pub fn build_tree(preorder: Vec<i32>, inorder: Vec<i32>) -> Option<Rc<RefCell<TreeNode>>> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_tree`
[INFO] [stdout]    --> src/medium/graphs.rs:160:12
[INFO] [stdout]     |
[INFO] [stdout] 160 |         fn build_tree(
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `kth_smallest`
[INFO] [stdout]    --> src/medium/graphs.rs:196:12
[INFO] [stdout]     |
[INFO] [stdout] 196 |     pub fn kth_smallest(root: Option<Rc<RefCell<TreeNode>>>, k: i32) -> i32 {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find`
[INFO] [stdout]    --> src/medium/graphs.rs:197:12
[INFO] [stdout]     |
[INFO] [stdout] 197 |         fn find(root: Option<&RefCell<TreeNode>>, k: usize, cur_idx: &mut usize) -> Option<i32> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `num_islands`
[INFO] [stdout]    --> src/medium/graphs.rs:246:12
[INFO] [stdout]     |
[INFO] [stdout] 246 |     pub fn num_islands(grid: Vec<Vec<char>>) -> i32 {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `letter_combinations`
[INFO] [stdout]  --> src/medium/backtracking.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub fn letter_combinations(digits: String) -> Vec<String> {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `letter_combinations`
[INFO] [stdout]   --> src/medium/backtracking.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |         fn letter_combinations(digits: &mut Chars, numbers: &[Vec<char>]) -> Vec<String> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `generate_parenthesis`
[INFO] [stdout]   --> src/medium/backtracking.rs:73:12
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub fn generate_parenthesis(n: i32) -> Vec<String> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generate_parenthesis`
[INFO] [stdout]   --> src/medium/backtracking.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 |         fn generate_parenthesis(n: i32) -> HashSet<String> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `permute`
[INFO] [stdout]    --> src/medium/backtracking.rs:127:12
[INFO] [stdout]     |
[INFO] [stdout] 127 |     pub fn permute(nums: Vec<i32>) -> Vec<Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `permute`
[INFO] [stdout]    --> src/medium/backtracking.rs:128:12
[INFO] [stdout]     |
[INFO] [stdout] 128 |         fn permute(nums: &[i32]) -> Vec<Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `subsets`
[INFO] [stdout]    --> src/medium/backtracking.rs:179:12
[INFO] [stdout]     |
[INFO] [stdout] 179 |     pub fn subsets(nums: Vec<i32>) -> Vec<Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `subsets`
[INFO] [stdout]    --> src/medium/backtracking.rs:180:12
[INFO] [stdout]     |
[INFO] [stdout] 180 |         fn subsets(nums: &[i32]) -> Vec<Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `exist`
[INFO] [stdout]    --> src/medium/backtracking.rs:216:12
[INFO] [stdout]     |
[INFO] [stdout] 216 |     pub fn exist(board: Vec<Vec<char>>, word: String) -> bool {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dfs`
[INFO] [stdout]    --> src/medium/backtracking.rs:217:12
[INFO] [stdout]     |
[INFO] [stdout] 217 |         fn dfs(board: &mut [Vec<char>], s: &[char], chard_idx: usize, x: usize, y: usize) -> bool {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 32 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.42s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking top-questions v0.1.0 (/tmp/fixit)
[INFO] [stdout] error[E0412]: cannot find type `BTreeSet` in this scope
[INFO] [stdout]    --> src/medium/array_and_strings.rs:105:19
[INFO] [stdout]     |
[INFO] [stdout] 105 |     let expected: BTreeSet<BTreeSet<_>> = vec![
[INFO] [stdout]     |                   ^^^^^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::collections::BTreeSet;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `BTreeSet` in this scope
[INFO] [stdout]    --> src/medium/array_and_strings.rs:105:28
[INFO] [stdout]     |
[INFO] [stdout] 105 |     let expected: BTreeSet<BTreeSet<_>> = vec![
[INFO] [stdout]     |                            ^^^^^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::collections::BTreeSet;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `BTreeSet` in this scope
[INFO] [stdout]    --> src/medium/array_and_strings.rs:116:17
[INFO] [stdout]     |
[INFO] [stdout] 116 |     let result: BTreeSet<BTreeSet<_>> = Solution::group_anagrams(strs)
[INFO] [stdout]     |                 ^^^^^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::collections::BTreeSet;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `BTreeSet` in this scope
[INFO] [stdout]    --> src/medium/array_and_strings.rs:116:26
[INFO] [stdout]     |
[INFO] [stdout] 116 |     let result: BTreeSet<BTreeSet<_>> = Solution::group_anagrams(strs)
[INFO] [stdout]     |                          ^^^^^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use std::collections::BTreeSet;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Solution`
[INFO] [stdout]  --> src/main.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_zeroes`
[INFO] [stdout]   --> src/medium/array_and_strings.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub fn set_zeroes(matrix: &mut Vec<Vec<i32>>) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `group_anagrams`
[INFO] [stdout]   --> src/medium/array_and_strings.rs:76:12
[INFO] [stdout]    |
[INFO] [stdout] 76 |     pub fn group_anagrams(strs: Vec<String>) -> Vec<Vec<String>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_ch_idx`
[INFO] [stdout]   --> src/medium/array_and_strings.rs:77:12
[INFO] [stdout]    |
[INFO] [stdout] 77 |         fn get_ch_idx(c: char) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `length_of_longest_substring`
[INFO] [stdout]    --> src/medium/array_and_strings.rs:125:12
[INFO] [stdout]     |
[INFO] [stdout] 125 |     pub fn length_of_longest_substring(s: String) -> i32 {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `increasing_triplet`
[INFO] [stdout]    --> src/medium/array_and_strings.rs:171:12
[INFO] [stdout]     |
[INFO] [stdout] 171 |     pub fn increasing_triplet(_nums: Vec<i32>) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/medium/linked_list.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn new(val: i32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_iter`
[INFO] [stdout]   --> src/medium/linked_list.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 |     fn from_iter(i: impl IntoIterator<Item = i32>) -> Option<Box<Self>> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_two_numbers`
[INFO] [stdout]   --> src/medium/linked_list.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn add_two_numbers(
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum`
[INFO] [stdout]   --> src/medium/linked_list.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |         fn sum(
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `odd_even_list`
[INFO] [stdout]   --> src/medium/linked_list.rs:88:12
[INFO] [stdout]    |
[INFO] [stdout] 88 |     pub fn odd_even_list(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/medium/graphs.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     pub fn new(val: i32) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `from_iterator`
[INFO] [stdout]   --> src/medium/graphs.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn from_iterator(
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `inorder_traversal`
[INFO] [stdout]   --> src/medium/graphs.rs:57:12
[INFO] [stdout]    |
[INFO] [stdout] 57 |     pub fn inorder_traversal(root: Option<Rc<RefCell<TreeNode>>>) -> Vec<i32> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rec`
[INFO] [stdout]   --> src/medium/graphs.rs:58:12
[INFO] [stdout]    |
[INFO] [stdout] 58 |         fn rec(root: Option<&RefCell<TreeNode>>, result: &mut Vec<i32>) {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `zigzag_level_order`
[INFO] [stdout]   --> src/medium/graphs.rs:96:12
[INFO] [stdout]    |
[INFO] [stdout] 96 |     pub fn zigzag_level_order(root: Option<Rc<RefCell<TreeNode>>>) -> Vec<Vec<i32>> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `zigzag`
[INFO] [stdout]   --> src/medium/graphs.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 97 |         fn zigzag(root: Option<&RefCell<TreeNode>>, result: &mut Vec<Vec<i32>>, level: usize) {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `build_tree`
[INFO] [stdout]    --> src/medium/graphs.rs:151:12
[INFO] [stdout]     |
[INFO] [stdout] 151 |     pub fn build_tree(preorder: Vec<i32>, inorder: Vec<i32>) -> Option<Rc<RefCell<TreeNode>>> {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_tree`
[INFO] [stdout]    --> src/medium/graphs.rs:160:12
[INFO] [stdout]     |
[INFO] [stdout] 160 |         fn build_tree(
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `kth_smallest`
[INFO] [stdout]    --> src/medium/graphs.rs:196:12
[INFO] [stdout]     |
[INFO] [stdout] 196 |     pub fn kth_smallest(root: Option<Rc<RefCell<TreeNode>>>, k: i32) -> i32 {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find`
[INFO] [stdout]    --> src/medium/graphs.rs:197:12
[INFO] [stdout]     |
[INFO] [stdout] 197 |         fn find(root: Option<&RefCell<TreeNode>>, k: usize, cur_idx: &mut usize) -> Option<i32> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `num_islands`
[INFO] [stdout]    --> src/medium/graphs.rs:246:12
[INFO] [stdout]     |
[INFO] [stdout] 246 |     pub fn num_islands(grid: Vec<Vec<char>>) -> i32 {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `letter_combinations`
[INFO] [stdout]  --> src/medium/backtracking.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub fn letter_combinations(digits: String) -> Vec<String> {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `letter_combinations`
[INFO] [stdout]   --> src/medium/backtracking.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |         fn letter_combinations(digits: &mut Chars, numbers: &[Vec<char>]) -> Vec<String> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `generate_parenthesis`
[INFO] [stdout]   --> src/medium/backtracking.rs:73:12
[INFO] [stdout]    |
[INFO] [stdout] 73 |     pub fn generate_parenthesis(n: i32) -> Vec<String> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generate_parenthesis`
[INFO] [stdout]   --> src/medium/backtracking.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 |         fn generate_parenthesis(n: i32) -> HashSet<String> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `permute`
[INFO] [stdout]    --> src/medium/backtracking.rs:127:12
[INFO] [stdout]     |
[INFO] [stdout] 127 |     pub fn permute(nums: Vec<i32>) -> Vec<Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `permute`
[INFO] [stdout]    --> src/medium/backtracking.rs:128:12
[INFO] [stdout]     |
[INFO] [stdout] 128 |         fn permute(nums: &[i32]) -> Vec<Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `subsets`
[INFO] [stdout]    --> src/medium/backtracking.rs:179:12
[INFO] [stdout]     |
[INFO] [stdout] 179 |     pub fn subsets(nums: Vec<i32>) -> Vec<Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `subsets`
[INFO] [stdout]    --> src/medium/backtracking.rs:180:12
[INFO] [stdout]     |
[INFO] [stdout] 180 |         fn subsets(nums: &[i32]) -> Vec<Vec<i32>> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `exist`
[INFO] [stdout]    --> src/medium/backtracking.rs:216:12
[INFO] [stdout]     |
[INFO] [stdout] 216 |     pub fn exist(board: Vec<Vec<char>>, word: String) -> bool {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dfs`
[INFO] [stdout]    --> src/medium/backtracking.rs:217:12
[INFO] [stdout]     |
[INFO] [stdout] 217 |         fn dfs(board: &mut [Vec<char>], s: &[char], chard_idx: usize, x: usize, y: usize) -> bool {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `top-questions` due to 5 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 32 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] [stderr] error: failed to check after updating to 2021
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `cargo check --frozen --all --all-targets --message-format=json` (exit status: 101)
[INFO] running `Command { std: "docker" "inspect" "7ffb14b245c0bb36b0853d51cfdd5ce4ee697ba2d0216ffdd76ec3fe2e13f7e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ffb14b245c0bb36b0853d51cfdd5ce4ee697ba2d0216ffdd76ec3fe2e13f7e9", kill_on_drop: false }`
[INFO] [stdout] 7ffb14b245c0bb36b0853d51cfdd5ce4ee697ba2d0216ffdd76ec3fe2e13f7e9