[INFO] updating cached repository https://github.com/evgeni-nabokov/leetcode-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/evgeni-nabokov/leetcode-rust
[INFO] [stderr]    e6012ea..dfd07d2  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] dfd07d258159bc8c60af9482db11da4a75fd61cb
[INFO] checking evgeni-nabokov/leetcode-rust against try#8a5e87609850cdd8679aada01eb0f3062f254ca8 for pr-71140
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fevgeni-nabokov%2Fleetcode-rust" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/evgeni-nabokov/leetcode-rust on toolchain 8a5e87609850cdd8679aada01eb0f3062f254ca8
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a5e87609850cdd8679aada01eb0f3062f254ca8" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/evgeni-nabokov/leetcode-rust
[INFO] finished tweaking git repo https://github.com/evgeni-nabokov/leetcode-rust
[INFO] tweaked toml for git repo https://github.com/evgeni-nabokov/leetcode-rust written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/evgeni-nabokov/leetcode-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a5e87609850cdd8679aada01eb0f3062f254ca8" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+8a5e87609850cdd8679aada01eb0f3062f254ca8" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e8f2e83ac330038e4330b6a61781f2187eccab740ab9a86f9aa2c6f8b4dd0975
[INFO] running `"docker" "start" "-a" "e8f2e83ac330038e4330b6a61781f2187eccab740ab9a86f9aa2c6f8b4dd0975"`
[INFO] [stderr]     Checking leetcode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `min`
[INFO] [stderr]  --> src/challenge/mod.rs:7:21
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::cmp::{max, min};
[INFO] [stderr]   |                     ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::challenge::tree_node::TreeNode`
[INFO] [stderr]   --> src/challenge/mod.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use crate::challenge::tree_node::TreeNode;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `min`
[INFO] [stderr]  --> src/challenge/mod.rs:7:21
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::cmp::{max, min};
[INFO] [stderr]   |                     ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::challenge::tree_node::TreeNode`
[INFO] [stderr]   --> src/challenge/mod.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use crate::challenge::tree_node::TreeNode;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/contest184/mod.rs:92:12
[INFO] [stderr]    |
[INFO] [stderr] 92 |        for i in 2..=n {
[INFO] [stderr]    |            ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/challenge/list_node.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn new(val: i32) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/challenge/tree_node.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub fn new(val: i32) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `MinStack`
[INFO] [stderr]  --> src/challenge/min_stack.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub struct MinStack {
[INFO] [stderr]   |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/challenge/min_stack.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     pub fn new() -> Self {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push`
[INFO] [stderr]   --> src/challenge/min_stack.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     pub fn push(&mut self, x: i32) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `pop`
[INFO] [stderr]   --> src/challenge/min_stack.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     pub fn pop(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `top`
[INFO] [stderr]   --> src/challenge/min_stack.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     pub fn top(&mut self) -> Option<i32> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_min`
[INFO] [stderr]   --> src/challenge/min_stack.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub fn get_min(&self) -> Option<i32> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Solution`
[INFO] [stderr]   --> src/challenge/mod.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | struct Solution;
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `single_number`
[INFO] [stderr]   --> src/challenge/mod.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     pub fn single_number(mut nums: Vec<i32>) -> i32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `single_number_v2`
[INFO] [stderr]   --> src/challenge/mod.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn single_number_v2(nums: Vec<i32>) -> i32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_happy`
[INFO] [stderr]   --> src/challenge/mod.rs:48:5
[INFO] [stderr]    |
[INFO] [stderr] 48 |     pub fn is_happy(n: i32) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `max_sub_array`
[INFO] [stderr]   --> src/challenge/mod.rs:74:5
[INFO] [stderr]    |
[INFO] [stderr] 74 |     pub fn max_sub_array(nums: Vec<i32>) -> i32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `max_sub_array_v2`
[INFO] [stderr]   --> src/challenge/mod.rs:98:5
[INFO] [stderr]    |
[INFO] [stderr] 98 |     pub fn max_sub_array_v2(nums: Vec<i32>) -> i32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `move_zeroes`
[INFO] [stderr]    --> src/challenge/mod.rs:110:5
[INFO] [stderr]     |
[INFO] [stderr] 110 |     pub fn move_zeroes(nums: &mut Vec<i32>) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `move_zeroes_v2`
[INFO] [stderr]    --> src/challenge/mod.rs:128:5
[INFO] [stderr]     |
[INFO] [stderr] 128 |     pub fn move_zeroes_v2(nums: &mut Vec<i32>) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `max_profit`
[INFO] [stderr]    --> src/challenge/mod.rs:145:5
[INFO] [stderr]     |
[INFO] [stderr] 145 |     pub fn max_profit(prices: Vec<i32>) -> i32 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `max_profit_v2`
[INFO] [stderr]    --> src/challenge/mod.rs:182:5
[INFO] [stderr]     |
[INFO] [stderr] 182 |     pub fn max_profit_v2(prices: Vec<i32>) -> i32 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `group_anagrams`
[INFO] [stderr]    --> src/challenge/mod.rs:197:5
[INFO] [stderr]     |
[INFO] [stderr] 197 |     pub fn group_anagrams(strs: Vec<String>) -> Vec<Vec<String>> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `group_anagrams_v2`
[INFO] [stderr]    --> src/challenge/mod.rs:216:5
[INFO] [stderr]     |
[INFO] [stderr] 216 |     pub fn group_anagrams_v2(strs: Vec<String>) -> Vec<Vec<String>> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `count_elements`
[INFO] [stderr]    --> src/challenge/mod.rs:233:5
[INFO] [stderr]     |
[INFO] [stderr] 233 |     pub fn count_elements(mut arr: Vec<i32>) -> i32 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `middle_node`
[INFO] [stderr]    --> src/challenge/mod.rs:253:5
[INFO] [stderr]     |
[INFO] [stderr] 253 |     pub fn middle_node(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `backspace_compare`
[INFO] [stderr]    --> src/challenge/mod.rs:270:5
[INFO] [stderr]     |
[INFO] [stderr] 270 |     pub fn backspace_compare(s: String, t: String) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `last_stone_weight`
[INFO] [stderr]    --> src/challenge/mod.rs:283:6
[INFO] [stderr]     |
[INFO] [stderr] 283 |      pub fn last_stone_weight(stones: Vec<i32>) -> i32 {
[INFO] [stderr]     |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `find_max_length`
[INFO] [stderr]    --> src/challenge/mod.rs:301:5
[INFO] [stderr]     |
[INFO] [stderr] 301 |     pub fn find_max_length(nums: Vec<i32>) -> i32 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `string_shift`
[INFO] [stderr]    --> src/challenge/mod.rs:319:5
[INFO] [stderr]     |
[INFO] [stderr] 319 |     pub fn string_shift(s: String, shift: Vec<Vec<i32>>) -> String {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `product_except_self`
[INFO] [stderr]    --> src/challenge/mod.rs:336:5
[INFO] [stderr]     |
[INFO] [stderr] 336 |     pub fn product_except_self(nums: Vec<i32>) -> Vec<i32> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `product_except_self_v2`
[INFO] [stderr]    --> src/challenge/mod.rs:351:5
[INFO] [stderr]     |
[INFO] [stderr] 351 |     pub fn product_except_self_v2(nums: Vec<i32>) -> Vec<i32> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `check_valid_string`
[INFO] [stderr]    --> src/challenge/mod.rs:367:5
[INFO] [stderr]     |
[INFO] [stderr] 367 |     pub fn check_valid_string(s: String) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `apply_backspaces`
[INFO] [stderr]    --> src/challenge/mod.rs:394:8
[INFO] [stderr]     |
[INFO] [stderr] 394 | pub fn apply_backspaces(iter: &mut Rev<Chars>) -> Option<char> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Solution`
[INFO] [stderr]  --> src/contest184/mod.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | struct Solution;
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `string_matching`
[INFO] [stderr]   --> src/contest184/mod.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn string_matching(mut words: Vec<String>) -> Vec<String> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `entity_parser`
[INFO] [stderr]   --> src/contest184/mod.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     pub fn entity_parser(text: String) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `process_queries`
[INFO] [stderr]   --> src/contest184/mod.rs:65:5
[INFO] [stderr]    |
[INFO] [stderr] 65 |     pub fn process_queries(queries: Vec<i32>, m: i32) -> Vec<i32> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `num_of_ways`
[INFO] [stderr]   --> src/contest184/mod.rs:86:5
[INFO] [stderr]    |
[INFO] [stderr] 86 |     pub fn num_of_ways(n: i32) -> i32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Solution`
[INFO] [stderr]  --> src/easy/mod.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | struct Solution {}
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `two_sum`
[INFO] [stderr]   --> src/easy/mod.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn two_sum(nums: Vec<i32>, target: i32) -> Vec<i32> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Solution`
[INFO] [stderr]  --> src/medium/mod.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct Solution {}
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `three_sum`
[INFO] [stderr]  --> src/medium/mod.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     pub fn three_sum(mut nums: Vec<i32>) -> Vec<Vec<i32>> {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 42 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/contest184/mod.rs:92:12
[INFO] [stderr]    |
[INFO] [stderr] 92 |        for i in 2..=n {
[INFO] [stderr]    |            ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/challenge/tree_node.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub fn new(val: i32) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.35s
[INFO] running `"docker" "inspect" "e8f2e83ac330038e4330b6a61781f2187eccab740ab9a86f9aa2c6f8b4dd0975"`
[INFO] running `"docker" "rm" "-f" "e8f2e83ac330038e4330b6a61781f2187eccab740ab9a86f9aa2c6f8b4dd0975"`
[INFO] [stdout] e8f2e83ac330038e4330b6a61781f2187eccab740ab9a86f9aa2c6f8b4dd0975