[INFO] cloning repository https://github.com/GrossBetruger/CrackingTheJobInterview
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/GrossBetruger/CrackingTheJobInterview" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGrossBetruger%2FCrackingTheJobInterview", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGrossBetruger%2FCrackingTheJobInterview'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e8eb6815567278454f1509ecfaf87b1db272dde6
[INFO] checking GrossBetruger/CrackingTheJobInterview against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGrossBetruger%2FCrackingTheJobInterview" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/GrossBetruger/CrackingTheJobInterview on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/GrossBetruger/CrackingTheJobInterview
[INFO] finished tweaking git repo https://github.com/GrossBetruger/CrackingTheJobInterview
[INFO] tweaked toml for git repo https://github.com/GrossBetruger/CrackingTheJobInterview written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/GrossBetruger/CrackingTheJobInterview already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 63c1ba0dc659a14acf15713fc62bdcad67e048a4762151f756d85e8b29d7770e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "63c1ba0dc659a14acf15713fc62bdcad67e048a4762151f756d85e8b29d7770e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "63c1ba0dc659a14acf15713fc62bdcad67e048a4762151f756d85e8b29d7770e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63c1ba0dc659a14acf15713fc62bdcad67e048a4762151f756d85e8b29d7770e", kill_on_drop: false }`
[INFO] [stdout] 63c1ba0dc659a14acf15713fc62bdcad67e048a4762151f756d85e8b29d7770e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e0f89f29c64d97ee63879985d233d39b9b44fc92b887ebb65db0612ad9225535
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e0f89f29c64d97ee63879985d233d39b9b44fc92b887ebb65db0612ad9225535", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking queues v1.1.0
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]     Checking petgraph v0.5.1
[INFO] [stderr]     Checking cracking_the_job_interview v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `HashSet`, `LinkedList`
[INFO] [stdout]  --> src/linked_lists.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{LinkedList, HashSet};
[INFO] [stdout]   |                        ^^^^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashMap`
[INFO] [stdout]  --> src/graphs.rs:4:24
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `petgraph::visit::FilterNode`
[INFO] [stdout]  --> src/graphs.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use petgraph::visit::FilterNode;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `petgraph::data::Element::Node`
[INFO] [stdout]  --> src/graphs.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use petgraph::data::Element::Node;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `HashSet`, `LinkedList`
[INFO] [stdout]  --> src/linked_lists.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{LinkedList, HashSet};
[INFO] [stdout]   |                        ^^^^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::LinkedList`
[INFO] [stdout]   --> src/linked_lists.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     use std::collections::LinkedList;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Node`, `Tree`, `traverse_node_in_order`
[INFO] [stdout]   --> src/trees_and_graphs.rs:77:35
[INFO] [stdout]    |
[INFO] [stdout] 77 |     use crate::trees_and_graphs::{Node, Tree, traverse_node_in_order, BinaryTree, BinaryNode};
[INFO] [stdout]    |                                   ^^^^  ^^^^  ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]   --> src/trees_and_graphs.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     use std::collections::HashMap;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashMap`
[INFO] [stdout]  --> src/graphs.rs:4:24
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `petgraph::visit::FilterNode`
[INFO] [stdout]  --> src/graphs.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use petgraph::visit::FilterNode;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `petgraph::data::Element::Node`
[INFO] [stdout]  --> src/graphs.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use petgraph::data::Element::Node;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Node`
[INFO] [stdout]  --> src/trees_and_graphs.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Node<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `BinaryNode`
[INFO] [stdout]  --> src/trees_and_graphs.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct BinaryNode<T: std::fmt::Display> {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Tree`
[INFO] [stdout]   --> src/trees_and_graphs.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Tree<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `BinaryTree`
[INFO] [stdout]   --> src/trees_and_graphs.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct BinaryTree<T: std::fmt::Display> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trees_and_graphs.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn new(data: T, left: Box<Option<BinaryNode<T>>>, right: Box<Option<BinaryNode<T>>>)
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trees_and_graphs.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn new(root: BinaryNode<T>) -> BinaryTree<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trees_and_graphs.rs:42:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |     pub fn new(data: T, children: Vec<Node<T>>) -> Node<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `leaf_node`
[INFO] [stdout]   --> src/trees_and_graphs.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn leaf_node(data: T) -> Node<T> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trees_and_graphs.rs:58:12
[INFO] [stdout]    |
[INFO] [stdout] 58 |     pub fn new(root: Node<T>) -> Tree<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `traverse_node_in_order`
[INFO] [stdout]   --> src/trees_and_graphs.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn traverse_node_in_order<T: std::cmp::PartialEq + std::fmt::Display>(node: &Node<T>){
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `handle_neighbors`
[INFO] [stdout]  --> src/graphs.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn handle_neighbors(queue: & mut Queue<NodeIndex>, visited: &HashSet<NodeIndex>,
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `search_path`
[INFO] [stdout]   --> src/graphs.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn search_path(graph: Graph<&str, u32>, from: NodeIndex, to: NodeIndex) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_unique`
[INFO] [stdout]   --> src/main.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn is_unique(s: String) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `check_permutation`
[INFO] [stdout]   --> src/main.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn check_permutation(s1: &str, s2: &str) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `palindrome_permutation`
[INFO] [stdout]   --> src/main.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn palindrome_permutation(s: &str) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `one_away`
[INFO] [stdout]   --> src/main.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn one_away(s1: String, s2: String) -> bool {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `compare_with_one_change`
[INFO] [stdout]   --> src/main.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn compare_with_one_change(s1: &str, s2: &str) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_compression`
[INFO] [stdout]    --> src/main.rs:130:4
[INFO] [stdout]     |
[INFO] [stdout] 130 | fn string_compression(s: &str) -> String {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `push_counter`
[INFO] [stdout]    --> src/main.rs:159:4
[INFO] [stdout]     |
[INFO] [stdout] 159 | fn push_counter(counter: usize, char_vec: &mut Vec<char>) {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rotate_matrix`
[INFO] [stdout]    --> src/main.rs:168:4
[INFO] [stdout]     |
[INFO] [stdout] 168 | fn rotate_matrix(matrix: Vec<Vec<u32>>) -> Vec<Vec<u32>>{
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/graphs.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         queue.add(neighbor.clone());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 25 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Node`
[INFO] [stdout]  --> src/trees_and_graphs.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Node<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `right`
[INFO] [stdout]   --> src/trees_and_graphs.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     pub right: Box<Option<BinaryNode<T>>>
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Tree`
[INFO] [stdout]   --> src/trees_and_graphs.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Tree<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trees_and_graphs.rs:42:12
[INFO] [stdout]    |
[INFO] [stdout] 42 |     pub fn new(data: T, children: Vec<Node<T>>) -> Node<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `leaf_node`
[INFO] [stdout]   --> src/trees_and_graphs.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn leaf_node(data: T) -> Node<T> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trees_and_graphs.rs:58:12
[INFO] [stdout]    |
[INFO] [stdout] 58 |     pub fn new(root: Node<T>) -> Tree<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `traverse_node_in_order`
[INFO] [stdout]   --> src/trees_and_graphs.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn traverse_node_in_order<T: std::cmp::PartialEq + std::fmt::Display>(node: &Node<T>){
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/graphs.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         queue.add(neighbor.clone());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.98s
[INFO] running `Command { std: "docker" "inspect" "e0f89f29c64d97ee63879985d233d39b9b44fc92b887ebb65db0612ad9225535", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0f89f29c64d97ee63879985d233d39b9b44fc92b887ebb65db0612ad9225535", kill_on_drop: false }`
[INFO] [stdout] e0f89f29c64d97ee63879985d233d39b9b44fc92b887ebb65db0612ad9225535