[INFO] cloning repository https://github.com/i-akv/dsa
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/i-akv/dsa" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fi-akv%2Fdsa", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fi-akv%2Fdsa'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c52a2cd38cbf6fd46fa868574b80a39d8a4c52f2
[INFO] checking i-akv/dsa against try#6db1a6a7ebb2ad243051f3ff949f987dd70cde2b+rustflags=-Dreturn-local-variable-ptr for pr-134218
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fi-akv%2Fdsa" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/i-akv/dsa on toolchain 6db1a6a7ebb2ad243051f3ff949f987dd70cde2b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6db1a6a7ebb2ad243051f3ff949f987dd70cde2b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/i-akv/dsa
[INFO] finished tweaking git repo https://github.com/i-akv/dsa
[INFO] tweaked toml for git repo https://github.com/i-akv/dsa written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/i-akv/dsa 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" "+6db1a6a7ebb2ad243051f3ff949f987dd70cde2b" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+6db1a6a7ebb2ad243051f3ff949f987dd70cde2b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 56b1af416e58aef45b7cd0384898fc1e7d50416e7c24d1a80c3f48f047acf63b
[INFO] running `Command { std: "docker" "start" "-a" "56b1af416e58aef45b7cd0384898fc1e7d50416e7c24d1a80c3f48f047acf63b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "56b1af416e58aef45b7cd0384898fc1e7d50416e7c24d1a80c3f48f047acf63b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56b1af416e58aef45b7cd0384898fc1e7d50416e7c24d1a80c3f48f047acf63b", kill_on_drop: false }`
[INFO] [stdout] 56b1af416e58aef45b7cd0384898fc1e7d50416e7c24d1a80c3f48f047acf63b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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 -Dreturn-local-variable-ptr" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+6db1a6a7ebb2ad243051f3ff949f987dd70cde2b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ca7ace064930d8b061ff337161f0ddba5c746a4fd7970eeb5e9022c47f6ba80e
[INFO] running `Command { std: "docker" "start" "-a" "ca7ace064930d8b061ff337161f0ddba5c746a4fd7970eeb5e9022c47f6ba80e", kill_on_drop: false }`
[INFO] [stderr]     Checking dsa v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/array_strings/merge_stings_alternately.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `merge_alternately` is never used
[INFO] [stdout]  --> src/array_strings/merge_stings_alternately.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn merge_alternately(word1:String, word2:String) -> String {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/array_strings/greatest_common_divisor_of_strings.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `gcd_of_strings` and `gcd_of_nums` are never used
[INFO] [stdout]   --> src/array_strings/greatest_common_divisor_of_strings.rs:3:12
[INFO] [stdout]    |
[INFO] [stdout] 2  | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 3  |     pub fn gcd_of_strings(str1: String, str2: String) -> String {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 14 |     fn gcd_of_nums(a: u32, b: u32) -> u32 {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/array_strings/kids_with_the_greatest_number_of_candies.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `kids_with_candies` is never used
[INFO] [stdout]  --> src/array_strings/kids_with_the_greatest_number_of_candies.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn kids_with_candies(candies: Vec<i32>, extra_candies: i32) -> Vec<bool> {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/array_strings/can_place_flowers.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `can_place_flowers` is never used
[INFO] [stdout]  --> src/array_strings/can_place_flowers.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn can_place_flowers(flowerbed: Vec<i32>, n: i32) -> bool {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/array_strings/reverse_vowels_of_a_string.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `reverse_vowels` is never used
[INFO] [stdout]  --> src/array_strings/reverse_vowels_of_a_string.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn reverse_vowels(s: String) -> String {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/array_strings/reverse_words_in_a_string.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `reverse_words` is never used
[INFO] [stdout]  --> src/array_strings/reverse_words_in_a_string.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn reverse_words(s: String) -> String {
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/array_strings/product_of_array_except_self.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `product_except_self` is never used
[INFO] [stdout]  --> src/array_strings/product_of_array_except_self.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn product_except_self(nums: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/array_strings/increasing_triplet_subsequence.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `increasing_triplet` is never used
[INFO] [stdout]  --> src/array_strings/increasing_triplet_subsequence.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn increasing_triplet(nums: Vec<i32>) -> bool {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/array_strings/string_compression.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `compress` is never used
[INFO] [stdout]  --> src/array_strings/string_compression.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn compress(chars: &mut Vec<char>) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/two_pointers/move_zeroes.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `move_zeroes` is never used
[INFO] [stdout]  --> src/two_pointers/move_zeroes.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn move_zeroes(nums: &mut Vec<i32>) {
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/two_pointers/is_subsequence.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_subsequence` is never used
[INFO] [stdout]  --> src/two_pointers/is_subsequence.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn is_subsequence(s: String, t: String) -> bool {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/two_pointers/container_with_most_water.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `max_area` is never used
[INFO] [stdout]  --> src/two_pointers/container_with_most_water.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn max_area(height: Vec<i32>) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/two_pointers/maximum_number_of_k_sum_pairs.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `max_operations` is never used
[INFO] [stdout]  --> src/two_pointers/maximum_number_of_k_sum_pairs.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 4 |     pub fn max_operations(nums: Vec<i32>, k: i32) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/sliding_window/maximum_average_subarray_i.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `find_max_average` is never used
[INFO] [stdout]  --> src/sliding_window/maximum_average_subarray_i.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn find_max_average(nums: Vec<i32>, k: i32) -> f64 {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/sliding_window/maximum_number_of_vowels_in_a_substring_of_given_length.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `max_vowels` is never used
[INFO] [stdout]  --> src/sliding_window/maximum_number_of_vowels_in_a_substring_of_given_length.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn max_vowels(s: String, k: i32) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/sliding_window/max_consecutive_ones_iii.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `longest_ones` is never used
[INFO] [stdout]  --> src/sliding_window/max_consecutive_ones_iii.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn longest_ones(nums: Vec<i32>, k: i32) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/sliding_window/longest_subarray_of_1s_after_deleting_one_element.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `longest_subarray` is never used
[INFO] [stdout]  --> src/sliding_window/longest_subarray_of_1s_after_deleting_one_element.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn longest_subarray(nums: Vec<i32>) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/prefix_sum/find_the_highest_altitude.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Solution;
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `largest_altitude` is never used
[INFO] [stdout]  --> src/prefix_sum/find_the_highest_altitude.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 3 |     pub fn largest_altitude(gain: Vec<i32>) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/prefix_sum/find_pivot_index.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `pivot_index` and `pivot_index_lil_fast` are never used
[INFO] [stdout]   --> src/prefix_sum/find_pivot_index.rs:4:12
[INFO] [stdout]    |
[INFO] [stdout] 3  | impl Solution {
[INFO] [stdout]    | ------------- associated functions in this implementation
[INFO] [stdout] 4  |     pub fn pivot_index(nums: Vec<i32>) -> i32 {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     pub fn pivot_index_lil_fast(nums: Vec<i32>) -> i32 {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/stack/decode_string.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `decode_string` is never used
[INFO] [stdout]  --> src/stack/decode_string.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 4 |     pub fn decode_string(s: String) -> String {
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/stack/removing_stars_from_a_string.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `remove_stars` is never used
[INFO] [stdout]  --> src/stack/removing_stars_from_a_string.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 4 |     pub fn remove_stars(s: String) -> String {
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/stack/asteroid_collision.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `asteroid_collision` is never used
[INFO] [stdout]  --> src/stack/asteroid_collision.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 4 |     pub fn asteroid_collision(asteroids: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/hashmap_set/unique_number_of_occurrences.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `unique_occurrences` is never used
[INFO] [stdout]  --> src/hashmap_set/unique_number_of_occurrences.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 6 |     pub fn unique_occurrences(arr: Vec<i32>) -> bool {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/hashmap_set/find_the_difference_of_two_arrays.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `find_difference` is never used
[INFO] [stdout]  --> src/hashmap_set/find_the_difference_of_two_arrays.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 6 |     pub fn find_difference(nums1: Vec<i32>, nums2: Vec<i32>) -> Vec<Vec<i32>> {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/hashmap_set/determine_if_two_strings_are_close.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `close_strings` is never used
[INFO] [stdout]  --> src/hashmap_set/determine_if_two_strings_are_close.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 6 |     pub fn close_strings(word1: String, word2: String) -> bool {
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/hashmap_set/equal_rows_and_column_pairs.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Solution;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `equal_pairs` is never used
[INFO] [stdout]  --> src/hashmap_set/equal_rows_and_column_pairs.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 4 |     pub fn equal_pairs(grid: Vec<Vec<i32>>) -> i32 {
[INFO] [stdout]   |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RecentCounter` is never constructed
[INFO] [stdout]  --> src/queue/number_of_recent_calls.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct RecentCounter {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `ping` are never used
[INFO] [stdout]   --> src/queue/number_of_recent_calls.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl RecentCounter {
[INFO] [stdout]    | ------------------ associated items in this implementation
[INFO] [stdout] 8  |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn ping(&mut self, t: i32) -> i32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RecentCounter` is never constructed
[INFO] [stdout]  --> src/queue/number_of_recent_calls.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct RecentCounter {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `ping` are never used
[INFO] [stdout]   --> src/queue/number_of_recent_calls.rs:8:8
[INFO] [stdout]    |
[INFO] [stdout] 7  | impl RecentCounter {
[INFO] [stdout]    | ------------------ associated items in this implementation
[INFO] [stdout] 8  |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn ping(&mut self, t: i32) -> i32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:52:35
[INFO] [stdout]    |
[INFO] [stdout] 52 |             heap.peek().unwrap_or("Hello");
[INFO] [stdout]    |                         --------- ^^^^^^^ expected `&&(char, {integer})`, found `&str`
[INFO] [stdout]    |                         |
[INFO] [stdout]    |                         arguments to this method are incorrect
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected reference `&&(char, {integer})`
[INFO] [stdout]               found reference `&'static str`
[INFO] [stdout] help: the return type of this call is `&'static str` due to the type of the argument passed
[INFO] [stdout]   --> src/main.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |             heap.peek().unwrap_or("Hello");
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^-------^
[INFO] [stdout]    |                                   |
[INFO] [stdout]    |                                   this argument influences the return type of `unwrap_or`
[INFO] [stdout] note: method defined here
[INFO] [stdout]   --> /rustc/6db1a6a7ebb2ad243051f3ff949f987dd70cde2b/library/core/src/option.rs:992:12
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:52:35
[INFO] [stdout]    |
[INFO] [stdout] 52 |             heap.peek().unwrap_or("Hello");
[INFO] [stdout]    |                         --------- ^^^^^^^ expected `&&(char, {integer})`, found `&str`
[INFO] [stdout]    |                         |
[INFO] [stdout]    |                         arguments to this method are incorrect
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected reference `&&(char, {integer})`
[INFO] [stdout]               found reference `&'static str`
[INFO] [stdout] help: the return type of this call is `&'static str` due to the type of the argument passed
[INFO] [stdout]   --> src/main.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |             heap.peek().unwrap_or("Hello");
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^-------^
[INFO] [stdout]    |                                   |
[INFO] [stdout]    |                                   this argument influences the return type of `unwrap_or`
[INFO] [stdout] note: method defined here
[INFO] [stdout]   --> /rustc/6db1a6a7ebb2ad243051f3ff949f987dd70cde2b/library/core/src/option.rs:992:12
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `dsa` (bin "dsa") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `dsa` (bin "dsa" test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "ca7ace064930d8b061ff337161f0ddba5c746a4fd7970eeb5e9022c47f6ba80e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca7ace064930d8b061ff337161f0ddba5c746a4fd7970eeb5e9022c47f6ba80e", kill_on_drop: false }`
[INFO] [stdout] ca7ace064930d8b061ff337161f0ddba5c746a4fd7970eeb5e9022c47f6ba80e