[INFO] cloning repository https://github.com/giorgeabdala/RustPolkadotChallenges
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/giorgeabdala/RustPolkadotChallenges" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgiorgeabdala%2FRustPolkadotChallenges", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgiorgeabdala%2FRustPolkadotChallenges'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1e391bc4f885f7d1cc9b28eded72da415a979090
[INFO] checking giorgeabdala/RustPolkadotChallenges against try#8d46be77cd48fdbcced888d027457e2c9cf2aa16 for pr-142723
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgiorgeabdala%2FRustPolkadotChallenges" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/giorgeabdala/RustPolkadotChallenges on toolchain 8d46be77cd48fdbcced888d027457e2c9cf2aa16
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8d46be77cd48fdbcced888d027457e2c9cf2aa16" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/giorgeabdala/RustPolkadotChallenges
[INFO] finished tweaking git repo https://github.com/giorgeabdala/RustPolkadotChallenges
[INFO] tweaked toml for git repo https://github.com/giorgeabdala/RustPolkadotChallenges written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/giorgeabdala/RustPolkadotChallenges 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" "+8d46be77cd48fdbcced888d027457e2c9cf2aa16" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8d46be77cd48fdbcced888d027457e2c9cf2aa16" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 718ef667d3c298b20dca4fc634e42e8542f79dca7bcdf50362e45d26728320f6
[INFO] running `Command { std: "docker" "start" "-a" "718ef667d3c298b20dca4fc634e42e8542f79dca7bcdf50362e45d26728320f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "718ef667d3c298b20dca4fc634e42e8542f79dca7bcdf50362e45d26728320f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "718ef667d3c298b20dca4fc634e42e8542f79dca7bcdf50362e45d26728320f6", kill_on_drop: false }`
[INFO] [stdout] 718ef667d3c298b20dca4fc634e42e8542f79dca7bcdf50362e45d26728320f6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8d46be77cd48fdbcced888d027457e2c9cf2aa16" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bea39907dda76f4f36e10a3b98bbe395470fe6dfeb9ee1ed72ec50e1e1e62797
[INFO] running `Command { std: "docker" "start" "-a" "bea39907dda76f4f36e10a3b98bbe395470fe6dfeb9ee1ed72ec50e1e1e62797", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.95
[INFO] [stderr]    Compiling unicode-ident v1.0.18
[INFO] [stderr]    Compiling hashbrown v0.15.4
[INFO] [stderr]    Compiling rustversion v1.0.21
[INFO] [stderr]    Compiling equivalent v1.0.2
[INFO] [stderr]    Compiling toml_datetime v0.6.11
[INFO] [stderr]    Compiling winnow v0.7.10
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling unicode-xid v0.2.6
[INFO] [stderr]     Checking byte-slice-cast v1.2.3
[INFO] [stderr]     Checking arrayvec v0.7.6
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling indexmap v2.9.0
[INFO] [stderr]    Compiling parity-scale-codec v3.7.5
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.101
[INFO] [stderr]    Compiling const_format_proc_macros v0.2.34
[INFO] [stderr]     Checking const_format v0.2.34
[INFO] [stderr]    Compiling toml_edit v0.22.27
[INFO] [stderr]    Compiling proc-macro-crate v3.3.0
[INFO] [stderr]    Compiling derive_more-impl v1.0.0
[INFO] [stderr]    Compiling impl-trait-for-tuples v0.2.3
[INFO] [stderr]    Compiling parity-scale-codec-derive v3.7.5
[INFO] [stderr]     Checking derive_more v1.0.0
[INFO] [stderr]     Checking scale-info v2.11.6
[INFO] [stderr]     Checking exercicios v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/beginner/challenge_01.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/beginner/challenge_02.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/beginner/challenge_03.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TextAnalyzer`, `first_word`, and `longest`
[INFO] [stdout]   --> src/beginner/challenge_08.rs:34:41
[INFO] [stdout]    |
[INFO] [stdout] 34 |     use crate::beginner::challenge_08::{first_word, longest, TextAnalyzer};
[INFO] [stdout]    |                                         ^^^^^^^^^^  ^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `KeyValueStorage`, `StorageMap`, and `Storage`
[INFO] [stdout]   --> src/medium/challenge_02.rs:97:39
[INFO] [stdout]    |
[INFO] [stdout] 97 |     use crate::medium::challenge_02::{KeyValueStorage, Storage, StorageMap};
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^  ^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::task::Context`
[INFO] [stdout]  --> src/advanced/challenge_02.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::task::Context;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::task::Context`
[INFO] [stdout]  --> src/advanced/challenge_02.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::task::Context;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Player` is never constructed
[INFO] [stdout]  --> src/beginner/challenge_01.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct Player {
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_score`, `get_info`, and `reset_score` are never used
[INFO] [stdout]   --> src/beginner/challenge_01.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl Player {
[INFO] [stdout]    | ----------- associated items in this implementation
[INFO] [stdout] 11 |     fn new(name: String) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     fn add_score(&mut self, points: u32) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     fn get_info(&self) -> String {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     fn reset_score(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `transfer_player` is never used
[INFO] [stdout]   --> src/beginner/challenge_01.rs:35:4
[INFO] [stdout]    |
[INFO] [stdout] 35 | fn transfer_player(player: Player) -> Player {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `clone_player` is never used
[INFO] [stdout]   --> src/beginner/challenge_01.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn clone_player(player: &Player) -> Player {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Book` is never constructed
[INFO] [stdout]  --> src/beginner/challenge_02.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct Book {
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/beginner/challenge_02.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | impl Book {
[INFO] [stdout]   | --------- associated function in this implementation
[INFO] [stdout] 9 |     fn new(title: String)  -> Self{
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Library` is never constructed
[INFO] [stdout]   --> src/beginner/challenge_02.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct Library {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_book`, `find_book`, `borrow_book`, and `return_book` are never used
[INFO] [stdout]   --> src/beginner/challenge_02.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl Library {
[INFO] [stdout]    | ------------ associated items in this implementation
[INFO] [stdout] 19 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     fn add_book(&mut self, book: Book) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn find_book(&self, title: &str) -> Option<&Book> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 31 |     fn borrow_book(&mut self, title: &str) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |     fn return_book(&mut self, title: &str) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Color` is never used
[INFO] [stdout]  --> src/beginner/challenge_03.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Color {
[INFO] [stdout]   |      ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Color` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/beginner/challenge_03.rs:11:6
[INFO] [stdout]    |
[INFO] [stdout] 11 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `describe_color` is never used
[INFO] [stdout]   --> src/beginner/challenge_03.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn describe_color(color: Color) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `process_message` is never used
[INFO] [stdout]   --> src/beginner/challenge_03.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn process_message(msg: Message) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Contact` is never constructed
[INFO] [stdout]  --> src/beginner/challenge_04.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Contact {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Contact` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ContactBook` is never constructed
[INFO] [stdout]   --> src/beginner/challenge_04.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct ContactBook {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `set_email`, and `set_phone` are never used
[INFO] [stdout]   --> src/beginner/challenge_04.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | impl Contact {
[INFO] [stdout]    | ------------ associated items in this implementation
[INFO] [stdout] 16 |
[INFO] [stdout] 17 |     fn new(name: String) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn set_email(&mut self, email: String) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn set_phone(&mut self, phone: String) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add_contact`, `find_contact`, and `get_email` are never used
[INFO] [stdout]   --> src/beginner/challenge_04.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | impl ContactBook {
[INFO] [stdout]    | ---------------- associated items in this implementation
[INFO] [stdout] 32 |
[INFO] [stdout] 33 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     fn add_contact(&mut self, contact: Contact) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn find_contact(&self, name: &str) -> Option<&Contact> {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 45 |     fn get_email(&self, name: &str) -> Option<&String> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `OutOfRange` is never constructed
[INFO] [stdout]  --> src/beginner/challenge_05.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum SimpleError {
[INFO] [stdout]   |      ----------- variant in this enum
[INFO] [stdout] 5 |     InvalidInput,
[INFO] [stdout] 6 |     OutOfRange
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `SimpleError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `safe_divide` is never used
[INFO] [stdout]   --> src/beginner/challenge_05.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn safe_divide(a: i32, b:i32) -> Result<i32, SimpleError> {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_positive` is never used
[INFO] [stdout]   --> src/beginner/challenge_05.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn parse_positive(s: &str) -> Result<i32, SimpleError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_average` is never used
[INFO] [stdout]   --> src/beginner/challenge_05.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn calculate_average(numbers: &[&str]) -> Result<i32, SimpleError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest` is never used
[INFO] [stdout]  --> src/beginner/challenge_08.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]  --> src/beginner/challenge_08.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn first_word<'a>(s: &'a str) -> &'a str {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TextAnalyzer` is never constructed
[INFO] [stdout]   --> src/beginner/challenge_08.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct TextAnalyzer<'a> {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `word_count`, and `get_text` are never used
[INFO] [stdout]   --> src/beginner/challenge_08.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<'a> TextAnalyzer<'a> {
[INFO] [stdout]    | ------------------------- associated items in this implementation
[INFO] [stdout] 17 |     fn new(text: &'a str) -> TextAnalyzer<'a> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn word_count(&self) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     fn get_text(&self) -> &'a str {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Summable` is never used
[INFO] [stdout]  --> src/beginner/challenge_07.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub trait Summable {
[INFO] [stdout]   |           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Store` is never constructed
[INFO] [stdout]  --> src/beginner/challenge_07.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub struct Store<T> {
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Store` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/beginner/challenge_07.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl<T: Clone + Add<Output = T> + Copy> Store<T> {
[INFO] [stdout]    | ------------------------------------------------ associated function in this implementation
[INFO] [stdout] 14 |     pub fn new(v: T) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/beginner/challenge_07.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/medium/challenge_01.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/medium/challenge_01.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl User {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 12 |     fn new(id: u32, username: String, email: String, roles: Vec<String>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UserManager` is never constructed
[INFO] [stdout]   --> src/medium/challenge_01.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct UserManager {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]   --> src/medium/challenge_01.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl UserManager {
[INFO] [stdout]    | ---------------- associated items in this implementation
[INFO] [stdout] 25 |
[INFO] [stdout] 26 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 34 |     fn add_user(&mut self, user: User) -> Result<(), String> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 48 |     fn get_user(&self, id: u32) -> Option<&User> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     fn find_by_username(&self, username: &str) -> Option<&User> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 56 |     fn get_users_by_role(&self, role: &str) -> Vec<&User> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     fn start_session(&mut self, user_id: u32) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 69 |     fn end_session(&mut self, user_id: u32) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 74 |     fn get_active_users(&self) -> Vec<&User> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 80 |     fn get_sorted_usernames(&self) -> Vec<&String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Storable` is never used
[INFO] [stdout]  --> src/medium/challenge_02.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 | trait Storable {
[INFO] [stdout]   |       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Storage` is never constructed
[INFO] [stdout]   --> src/medium/challenge_02.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Storage<T> where T: Storable + Clone{
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `store`, `retrieve`, `len`, and `is_full` are never used
[INFO] [stdout]   --> src/medium/challenge_02.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl<T: Storable + Clone> Storage<T> {
[INFO] [stdout]    | ------------------------------------ associated items in this implementation
[INFO] [stdout] 19 |     fn new(capacity: usize) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     fn store(&mut self, item: T) -> Result<usize, String>  {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     fn retrieve(&self, index: usize) -> Option<&T> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn len(&self) -> usize {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 37 |     fn is_full(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `StorageMap` is never used
[INFO] [stdout]   --> src/medium/challenge_02.rs:43:7
[INFO] [stdout]    |
[INFO] [stdout] 43 | trait StorageMap {
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `KeyValueStorage` is never constructed
[INFO] [stdout]   --> src/medium/challenge_02.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 | struct KeyValueStorage<K, V> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/medium/challenge_02.rs:56:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | impl<K, V> KeyValueStorage<K, V> {
[INFO] [stdout]    | -------------------------------- associated function in this implementation
[INFO] [stdout] 56 |     fn new() -> Self{
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Weight` is never constructed
[INFO] [stdout]  --> src/advanced/challenge_02.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Weight {
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Weight` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `from_parts` and `zero` are never used
[INFO] [stdout]   --> src/advanced/challenge_02.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Weight {
[INFO] [stdout]    | ----------- associated functions in this implementation
[INFO] [stdout] 12 |     pub fn from_parts(ref_time: u64, proof_size: u64) -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn zero() -> Self {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `WeightInfo` is never used
[INFO] [stdout]   --> src/advanced/challenge_02.rs:21:11
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub trait WeightInfo {
[INFO] [stdout]    |           ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BenchmarkWeights` is never constructed
[INFO] [stdout]   --> src/advanced/challenge_02.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct BenchmarkWeights;
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Config` is never used
[INFO] [stdout]   --> src/advanced/challenge_02.rs:52:11
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub trait Config {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Pallet` is never constructed
[INFO] [stdout]   --> src/advanced/challenge_02.rs:56:12
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub struct Pallet<T: Config> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `create_item`, `update_item`, and `batch_delete` are never used
[INFO] [stdout]   --> src/advanced/challenge_02.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 62 | impl <T: Config> Pallet<T> {
[INFO] [stdout]    | -------------------------- methods in this implementation
[INFO] [stdout] 63 |
[INFO] [stdout] 64 |     pub fn create_item(&mut self, content: String) -> Result<u32, &'static str> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 73 |     pub fn update_item(&mut self, id: u32, new_content: String) -> Result<(), &'static str> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 81 |     pub fn batch_delete(&mut self, ids: Vec<u32>) -> Result<u32, &'static str> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FeeCalculator` is never constructed
[INFO] [stdout]   --> src/advanced/challenge_02.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 95 | pub struct FeeCalculator {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `calculate_fee` are never used
[INFO] [stdout]    --> src/advanced/challenge_02.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 100 | impl FeeCalculator {
[INFO] [stdout]     | ------------------ associated items in this implementation
[INFO] [stdout] 101 |     pub fn new() -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 108 |     pub fn calculate_fee(&self, weight: Weight) -> u64 {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WeightMeter` is never constructed
[INFO] [stdout]    --> src/advanced/challenge_02.rs:115:12
[INFO] [stdout]     |
[INFO] [stdout] 115 | pub struct WeightMeter {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `consume`, and `remaining` are never used
[INFO] [stdout]    --> src/advanced/challenge_02.rs:121:12
[INFO] [stdout]     |
[INFO] [stdout] 120 | impl WeightMeter {
[INFO] [stdout]     | ---------------- associated items in this implementation
[INFO] [stdout] 121 |     pub fn new(limit: Weight) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 128 |     pub fn consume(&mut self, weight: Weight) -> Result<(), &'static str> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 140 |     pub fn remaining(&self) -> Weight {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/medium/challenge_01.rs:172:13
[INFO] [stdout]     |
[INFO] [stdout] 172 |         let mut users = manager.get_users_by_role(&role.clone());
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/medium/challenge_01.rs:185:13
[INFO] [stdout]     |
[INFO] [stdout] 185 |         let mut users = manager.get_users_by_role("role non existent");
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/medium/challenge_01.rs:267:13
[INFO] [stdout]     |
[INFO] [stdout] 267 |         let mut usernames = manager.get_sorted_usernames();
[INFO] [stdout]     |             ----^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/advanced/challenge_02.rs:188:17
[INFO] [stdout]     |
[INFO] [stdout] 188 |             Err(e) => panic!("Failed to create item")
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]    --> src/advanced/challenge_02.rs:198:17
[INFO] [stdout]     |
[INFO] [stdout] 198 |             Err(e) => panic!("Failed to create item")
[INFO] [stdout]     |                 ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/beginner/challenge_07.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `to_bytes`, `from_bytes`, and `storage_key` are never used
[INFO] [stdout]  --> src/medium/challenge_02.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | trait Storable {
[INFO] [stdout]   |       -------- associated items in this trait
[INFO] [stdout] 4 |
[INFO] [stdout] 5 |     fn to_bytes(&self) -> Vec<u8> ;
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 6 |
[INFO] [stdout] 7 |     fn from_bytes(data: &[u8]) -> Result<Self, String> where Self: Sized ;
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 8 |
[INFO] [stdout] 9 |     fn storage_key(&self) -> String { "default".to_string() }
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `zero` is never used
[INFO] [stdout]   --> src/advanced/challenge_02.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Weight {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn zero() -> Self {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `update_item`, `delete_item`, and `batch_operation` are never used
[INFO] [stdout]   --> src/advanced/challenge_02.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub trait WeightInfo {
[INFO] [stdout]    |           ---------- associated functions in this trait
[INFO] [stdout] 22 |     fn create_item() -> Weight;
[INFO] [stdout] 23 |     fn update_item() -> Weight;
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 24 |     fn delete_item() -> Weight;
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 25 |     fn batch_operation(n: u32) -> Weight;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `update_item` and `batch_delete` are never used
[INFO] [stdout]   --> src/advanced/challenge_02.rs:73:12
[INFO] [stdout]    |
[INFO] [stdout] 62 | impl <T: Config> Pallet<T> {
[INFO] [stdout]    | -------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 73 |     pub fn update_item(&mut self, id: u32, new_content: String) -> Result<(), &'static str> {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 81 |     pub fn batch_delete(&mut self, ids: Vec<u32>) -> Result<u32, &'static str> {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FeeCalculator` is never constructed
[INFO] [stdout]   --> src/advanced/challenge_02.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 95 | pub struct FeeCalculator {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `calculate_fee` are never used
[INFO] [stdout]    --> src/advanced/challenge_02.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 100 | impl FeeCalculator {
[INFO] [stdout]     | ------------------ associated items in this implementation
[INFO] [stdout] 101 |     pub fn new() -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 108 |     pub fn calculate_fee(&self, weight: Weight) -> u64 {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WeightMeter` is never constructed
[INFO] [stdout]    --> src/advanced/challenge_02.rs:115:12
[INFO] [stdout]     |
[INFO] [stdout] 115 | pub struct WeightMeter {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `consume`, and `remaining` are never used
[INFO] [stdout]    --> src/advanced/challenge_02.rs:121:12
[INFO] [stdout]     |
[INFO] [stdout] 120 | impl WeightMeter {
[INFO] [stdout]     | ---------------- associated items in this implementation
[INFO] [stdout] 121 |     pub fn new(limit: Weight) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 128 |     pub fn consume(&mut self, weight: Weight) -> Result<(), &'static str> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 140 |     pub fn remaining(&self) -> Weight {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_benchmark_weights_create_item_returns_correct_weight` is never used
[INFO] [stdout]    --> src/advanced/challenge_02.rs:161:8
[INFO] [stdout]     |
[INFO] [stdout] 161 |     fn test_benchmark_weights_create_item_returns_correct_weight() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.26s
[INFO] running `Command { std: "docker" "inspect" "bea39907dda76f4f36e10a3b98bbe395470fe6dfeb9ee1ed72ec50e1e1e62797", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bea39907dda76f4f36e10a3b98bbe395470fe6dfeb9ee1ed72ec50e1e1e62797", kill_on_drop: false }`
[INFO] [stdout] bea39907dda76f4f36e10a3b98bbe395470fe6dfeb9ee1ed72ec50e1e1e62797