[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 master#43d9f3859e0204e764161ee085a360274b5f3e9a for pr-97346
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeonqn%2Fleetcode-solutions" "/workspace/builds/worker-33/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-33/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Leonqn/leetcode-solutions on toolchain 43d9f3859e0204e764161ee085a360274b5f3e9a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+43d9f3859e0204e764161ee085a360274b5f3e9a" "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-33/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" "+43d9f3859e0204e764161ee085a360274b5f3e9a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/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:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+43d9f3859e0204e764161ee085a360274b5f3e9a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8dc6888c1cde06d1b5ec06299899bac6815c3e7db643f542130060117e31a06b
[INFO] running `Command { std: "docker" "start" "-a" "8dc6888c1cde06d1b5ec06299899bac6815c3e7db643f542130060117e31a06b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8dc6888c1cde06d1b5ec06299899bac6815c3e7db643f542130060117e31a06b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8dc6888c1cde06d1b5ec06299899bac6815c3e7db643f542130060117e31a06b", kill_on_drop: false }`
[INFO] [stdout] 8dc6888c1cde06d1b5ec06299899bac6815c3e7db643f542130060117e31a06b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/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:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+43d9f3859e0204e764161ee085a360274b5f3e9a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3428f6d787cdaf5ac38aad03912fbfa8b2b1c71b8965118f2755484b32f6bbb5
[INFO] running `Command { std: "docker" "start" "-a" "3428f6d787cdaf5ac38aad03912fbfa8b2b1c71b8965118f2755484b32f6bbb5", kill_on_drop: false }`
[INFO] [stderr]     Checking top-questions v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `BTreeSet`
[INFO] [stdout]  --> src/medium/array_and_strings.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{BTreeSet, HashMap};
[INFO] [stdout]   |                        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[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] warning: 33 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.26s
[INFO] running `Command { std: "docker" "inspect" "3428f6d787cdaf5ac38aad03912fbfa8b2b1c71b8965118f2755484b32f6bbb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3428f6d787cdaf5ac38aad03912fbfa8b2b1c71b8965118f2755484b32f6bbb5", kill_on_drop: false }`
[INFO] [stdout] 3428f6d787cdaf5ac38aad03912fbfa8b2b1c71b8965118f2755484b32f6bbb5