[INFO] cloning repository https://github.com/Legend101Zz/rust-bot
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Legend101Zz/rust-bot" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLegend101Zz%2Frust-bot", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLegend101Zz%2Frust-bot'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 00cd374209285847dc2861af717d47b913038ad4
[INFO] testing Legend101Zz/rust-bot against 1.75.0 for beta-1.76-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLegend101Zz%2Frust-bot" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Legend101Zz/rust-bot on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Legend101Zz/rust-bot
[INFO] finished tweaking git repo https://github.com/Legend101Zz/rust-bot
[INFO] tweaked toml for git repo https://github.com/Legend101Zz/rust-bot written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Legend101Zz/rust-bot 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2c2dcfa08b6354e829f4508c78e9aec5bedc9dfbce105c50812b171f799e636f
[INFO] running `Command { std: "docker" "start" "-a" "2c2dcfa08b6354e829f4508c78e9aec5bedc9dfbce105c50812b171f799e636f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2c2dcfa08b6354e829f4508c78e9aec5bedc9dfbce105c50812b171f799e636f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c2dcfa08b6354e829f4508c78e9aec5bedc9dfbce105c50812b171f799e636f", kill_on_drop: false }`
[INFO] [stdout] 2c2dcfa08b6354e829f4508c78e9aec5bedc9dfbce105c50812b171f799e636f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 24e3d3095bfaae67d58699715836fbba255c6e889ff60a52c812fa0a7fe58868
[INFO] running `Command { std: "docker" "start" "-a" "24e3d3095bfaae67d58699715836fbba255c6e889ff60a52c812fa0a7fe58868", kill_on_drop: false }`
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[INFO] [stdout] warning: type `linked_list` should have an upper camel case name
[INFO] [stdout]  --> src/m12_linked_list.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct linked_list {
[INFO] [stdout]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `LinkedList`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `pointer` should have an upper camel case name
[INFO] [stdout]   --> src/m12_linked_list.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | type pointer = Option<Box<Node>>;
[INFO] [stdout]    |      ^^^^^^^ help: convert the identifier to upper camel case: `Pointer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cons`, `Nil`
[INFO] [stdout]  --> src/m12_reference_counting_pointer.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | use List::{Cons, Nil};
[INFO] [stdout]   |            ^^^^  ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `mad_skills`
[INFO] [stdout]  --> src/m14_macros.rs:1:14
[INFO] [stdout]   |
[INFO] [stdout] 1 | macro_rules! mad_skills {
[INFO] [stdout]   |              ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `string_concat`
[INFO] [stdout]   --> src/m14_macros.rs:14:14
[INFO] [stdout]    |
[INFO] [stdout] 14 | macro_rules! string_concat {
[INFO] [stdout]    |              ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `input`
[INFO] [stdout]   --> src/m14_macros.rs:25:14
[INFO] [stdout]    |
[INFO] [stdout] 25 | macro_rules! input {
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `my_vec`
[INFO] [stdout]   --> src/m14_macros.rs:38:14
[INFO] [stdout]    |
[INFO] [stdout] 38 | macro_rules! my_vec {
[INFO] [stdout]    |              ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `HashMap`, `HashSet`
[INFO] [stdout]  --> src/m8_collections.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                        ^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alice_check`
[INFO] [stdout]   --> src/m5_lifetimes.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let alice_check = largest(&check_ag, alice.points);
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_alice_check`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `travel_1`
[INFO] [stdout]   --> src/m9_mods.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let travel_1 = travel_history::Conveyance::Car;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `travel_2`
[INFO] [stdout]   --> src/m9_mods.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let travel_2 = travel_history::Conveyance::Air;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `area_rect1`
[INFO] [stdout]   --> src/main.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let area_rect1 = math_funcs::rect_area(&rect1.length, &rect1.width);
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_area_rect1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let mut f = min;
[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/main.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut m = max;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Cons` and `Nil` are never constructed
[INFO] [stdout]  --> src/m10_smart_pointers.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum List {
[INFO] [stdout]   |      ---- variants in this enum
[INFO] [stdout] 3 |     Cons(i32, Box<List>),
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 4 |     Nil,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Cons` is never constructed
[INFO] [stdout]   --> src/m11_custom_smart_pointers.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 61 | enum List {
[INFO] [stdout]    |      ---- variant in this enum
[INFO] [stdout] 62 |     Cons(i32, Option<Box<List>>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` 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 function `new` is never used
[INFO] [stdout]   --> src/m11_custom_smart_pointers.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 69 | impl<T: std::fmt::Debug> MySmartPointer<T> {
[INFO] [stdout]    | ------------------------------------------ associated function in this implementation
[INFO] [stdout] 70 |     fn new(x: T) -> MySmartPointer<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `my_fn` is never used
[INFO] [stdout]   --> src/m11_custom_smart_pointers.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn my_fn(str: &str) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `head` is never read
[INFO] [stdout]  --> src/m12_linked_list.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct linked_list {
[INFO] [stdout]   |        ----------- field in this struct
[INFO] [stdout] 3 |     head: pointer,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `linked_list` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `element` and `next` are never read
[INFO] [stdout]  --> src/m12_linked_list.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Node {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 8 |     element: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 9 |     next: pointer,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` 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 items `create_empty_list`, `add`, and `remove` are never used
[INFO] [stdout]   --> src/m12_linked_list.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl linked_list {
[INFO] [stdout]    | ---------------- associated items in this implementation
[INFO] [stdout] 15 |     fn create_empty_list() -> linked_list {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     fn add(&mut self, element: i32) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn remove(&mut self) -> Option<i32> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]  --> src/m12_reference_counting_pointer.rs:3:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum List {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `List` is never constructed
[INFO] [stdout]  --> src/m13_double_linked_list.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct List<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/m13_double_linked_list.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Node<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Pointer` is never used
[INFO] [stdout]   --> src/m13_double_linked_list.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | type Pointer<T> = Option<Rc<RefCell<Node<T>>>>;
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/m13_double_linked_list.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl<T: std::fmt::Display> Node<T> {
[INFO] [stdout]    | ---------------------------------- associated function in this implementation
[INFO] [stdout] 18 |     fn new(element: T) -> Rc<RefCell<Node<T>>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `push_front` are never used
[INFO] [stdout]   --> src/m13_double_linked_list.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl<T: std::fmt::Display> List<T> {
[INFO] [stdout]    | ---------------------------------- associated items in this implementation
[INFO] [stdout] 28 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 35 |     fn push_front(&mut self, element: T) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Red`, `Green`, `Blue`, and `Silver` are never constructed
[INFO] [stdout]  --> src/m1_enums.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum CarColour {
[INFO] [stdout]   |      --------- variants in this enum
[INFO] [stdout] 3 |     Red,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 4 |     Green,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     Blue,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     Silver,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `CarColour` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Ok` and `Err` are never constructed
[INFO] [stdout]   --> src/m1_enums.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum GivenResult<T, E> {
[INFO] [stdout]    |      ----------- variants in this enum
[INFO] [stdout] 11 |     Ok(T),
[INFO] [stdout]    |     ^^
[INFO] [stdout] 12 |     Err(E),
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `GivenResult` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `None` and `Some` are never constructed
[INFO] [stdout]   --> src/m1_enums.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | enum GivenOptions<T> {
[INFO] [stdout]    |      ------------ variants in this enum
[INFO] [stdout] 18 |     None,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 19 |     Some(T),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `GivenOptions` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Car`, `Train`, and `Air` are never constructed
[INFO] [stdout]   --> src/m1_enums.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum Conveyance {
[INFO] [stdout]    |      ---------- variants in this enum
[INFO] [stdout] 25 |     Car = 15,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 26 |     Train = 20,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 27 |     Air = 30,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Conveyance` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `travel_allowance` is never used
[INFO] [stdout]   --> src/m1_enums.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | impl Conveyance {
[INFO] [stdout]    | --------------- method in this implementation
[INFO] [stdout] 31 |     fn travel_allowance(&self, miles: i32) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `check_under_five` is never used
[INFO] [stdout]   --> src/m1_enums.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn check_under_five(num_check: u8) -> GivenResult<u8, String> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `check_under_five_built_in` is never used
[INFO] [stdout]   --> src/m1_enums.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn check_under_five_built_in(num_check: u8) -> Result<u8, String> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `remainder_zero` is never used
[INFO] [stdout]   --> src/m1_enums.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn remainder_zero(num_check: f32) -> GivenOptions<f32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `handle_car_colour_red` is never used
[INFO] [stdout]   --> src/m1_enums.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn handle_car_colour_red() -> CarColour {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `username`, `email`, `sign_in_count`, and `active` are never read
[INFO] [stdout]  --> src/m2_structs.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     username: String,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 6 |     active: bool,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` 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 `square` is never used
[INFO] [stdout]  --> src/m2_structs.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn square<T>(num: T) -> T
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `increment_signin_count`, `change_email`, and `change_username` are never used
[INFO] [stdout]   --> src/m2_structs.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl User {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 17 |     fn increment_signin_count(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn change_email(&mut self, new_email: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn change_username(user: &mut User, new_username: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change_username` is never used
[INFO] [stdout]   --> src/m2_structs.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn change_username(user: &mut User, new_username: &str) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Warrior`, `Archer`, and `Wizard` are never constructed
[INFO] [stdout]   --> src/m3_trait.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | enum Character {
[INFO] [stdout]    |      --------- variants in this enum
[INFO] [stdout] 12 |     Warrior,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 13 |     Archer,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 14 |     Wizard,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Character` 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 `get_ethereum_data` is never used
[INFO] [stdout]   --> src/m4_polymorphism.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn get_ethereum_data<T: EthereumAddress>(address: T) -> Address {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_lifetime` is never used
[INFO] [stdout]  --> src/m5_lifetimes.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn test_lifetime() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/m5_lifetimes.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn largest<'a, T: PartialOrd>(compare_1: &'a T, compare_2: &'a T) -> &'a T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/m5_lifetimes.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Person<'b> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `ChangeColor`, `Move`, and `Write` are never constructed
[INFO] [stdout]  --> src/m6_patterns.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Message {
[INFO] [stdout]   |      ------- variants in this enum
[INFO] [stdout] 3 |     Quit,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 4 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 5 |     Move { x: i32, y: i32 },
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     Write(String),
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Message` 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 `process_message` is never used
[INFO] [stdout]  --> src/m6_patterns.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn process_message(msg: Message) {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `my_async_call` is never used
[INFO] [stdout]  --> src/m7_async.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | async fn my_async_call(url: &str) -> Result<serde_json::Value, Error> {
[INFO] [stdout]   |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `allowance` is never used
[INFO] [stdout]  --> src/m9_mods.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn allowance() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Conveyance` is never used
[INFO] [stdout]  --> src/m9_mods.rs:2:14
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub enum Conveyance {
[INFO] [stdout]   |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 50 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 50s
[INFO] running `Command { std: "docker" "inspect" "24e3d3095bfaae67d58699715836fbba255c6e889ff60a52c812fa0a7fe58868", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24e3d3095bfaae67d58699715836fbba255c6e889ff60a52c812fa0a7fe58868", kill_on_drop: false }`
[INFO] [stdout] 24e3d3095bfaae67d58699715836fbba255c6e889ff60a52c812fa0a7fe58868
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7f6d9dbb4c4f73a102e43be602dab74a13b2695f7a7c1370b3727b9689a9cc55
[INFO] running `Command { std: "docker" "start" "-a" "7f6d9dbb4c4f73a102e43be602dab74a13b2695f7a7c1370b3727b9689a9cc55", kill_on_drop: false }`
[INFO] [stderr]    Compiling playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `List::Cons`
[INFO] [stdout]   --> src/m11_custom_smart_pointers.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     use List::Cons;
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `linked_list` should have an upper camel case name
[INFO] [stdout]  --> src/m12_linked_list.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct linked_list {
[INFO] [stdout]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `LinkedList`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `pointer` should have an upper camel case name
[INFO] [stdout]   --> src/m12_linked_list.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | type pointer = Option<Box<Node>>;
[INFO] [stdout]    |      ^^^^^^^ help: convert the identifier to upper camel case: `Pointer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `input`
[INFO] [stdout]   --> src/m14_macros.rs:25:14
[INFO] [stdout]    |
[INFO] [stdout] 25 | macro_rules! input {
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/m14_macros.rs:20:38
[INFO] [stdout]    |
[INFO] [stdout] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stdout]    |                                      ^ help: remove this semicolon
[INFO] [stdout] ...
[INFO] [stdout] 72 |         let str_null = string_concat!();
[INFO] [stdout]    |                        ---------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/m14_macros.rs:20:38
[INFO] [stdout]    |
[INFO] [stdout] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stdout]    |                                      ^ help: remove this semicolon
[INFO] [stdout] ...
[INFO] [stdout] 73 |         let str_single = string_concat!("First");
[INFO] [stdout]    |                          ----------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/m14_macros.rs:20:38
[INFO] [stdout]    |
[INFO] [stdout] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stdout]    |                                      ^ help: remove this semicolon
[INFO] [stdout] ...
[INFO] [stdout] 75 |         let str_multiple = string_concat!("Firts","Second");
[INFO] [stdout]    |                            -------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ethers::types::Res`
[INFO] [stdout]   --> src/m7_async.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     use ethers::types::Res;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stack_ref`
[INFO] [stdout]   --> src/m10_smart_pointers.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let stack_ref = &stack_var;
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stack_ref`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `heap_var`
[INFO] [stdout]   --> src/m10_smart_pointers.rs:28:13
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let heap_var = Box::new(stack_var);
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heap_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/m12_reference_counting_pointer.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let b = Rc::new(Cons(3, Rc::clone(&a)));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/m12_reference_counting_pointer.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 |         let c = Rc::new(Cons(4, Rc::clone(&a)));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list1`
[INFO] [stdout]   --> src/m13_double_linked_list.rs:59:17
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut list1: List<i32> = List::new();
[INFO] [stdout]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_list1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/m13_double_linked_list.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut list1: List<i32> = List::new();
[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: unused variable: `str_null`
[INFO] [stdout]   --> src/m14_macros.rs:72:13
[INFO] [stdout]    |
[INFO] [stdout] 72 |         let str_null = string_concat!();
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_null`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str_single`
[INFO] [stdout]   --> src/m14_macros.rs:73:13
[INFO] [stdout]    |
[INFO] [stdout] 73 |         let str_single = string_concat!("First");
[INFO] [stdout]    |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_single`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str_multiple`
[INFO] [stdout]   --> src/m14_macros.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |         let str_multiple = string_concat!("Firts","Second");
[INFO] [stdout]    |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_multiple`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_var`
[INFO] [stdout]   --> src/m14_macros.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let some_var = mad_skills!(i32);
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/m14_macros.rs:78:17
[INFO] [stdout]    |
[INFO] [stdout] 78 |         let mut x: Vec<i32>  = vec!();
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/m14_macros.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut temp_str = String::new();
[INFO] [stdout]    |             ----^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 72 |         let str_null = string_concat!();
[INFO] [stdout]    |                        ---------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/m14_macros.rs:78:13
[INFO] [stdout]    |
[INFO] [stdout] 78 |         let mut x: Vec<i32>  = vec!();
[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/m14_macros.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 79 |         let mut y = my_vec!(1,2,3,4);
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `addr`
[INFO] [stdout]   --> src/m4_polymorphism.rs:35:13
[INFO] [stdout]    |
[INFO] [stdout] 35 |         let addr: Address =
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_addr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alice_check`
[INFO] [stdout]   --> src/m5_lifetimes.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let alice_check = largest(&check_ag, alice.points);
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_alice_check`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prob_none`
[INFO] [stdout]   --> src/m6_patterns.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let prob_none: Option<i32> = None;
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prob_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `person1`
[INFO] [stdout]   --> src/m8_collections.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let person1 = "alice";
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_person1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `person2`
[INFO] [stdout]   --> src/m8_collections.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let person2 = "bob";
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_person2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `travel_1`
[INFO] [stdout]   --> src/m9_mods.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let travel_1 = travel_history::Conveyance::Car;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `travel_2`
[INFO] [stdout]   --> src/m9_mods.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let travel_2 = travel_history::Conveyance::Air;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `area_rect1`
[INFO] [stdout]   --> src/main.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let area_rect1 = math_funcs::rect_area(&rect1.length, &rect1.width);
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_area_rect1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let mut f = min;
[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/main.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut m = max;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Cons` is never constructed
[INFO] [stdout]   --> src/m11_custom_smart_pointers.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 61 | enum List {
[INFO] [stdout]    |      ---- variant in this enum
[INFO] [stdout] 62 |     Cons(i32, Option<Box<List>>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `head` and `tail` are never read
[INFO] [stdout]  --> src/m13_double_linked_list.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct List<T> {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 5 |     head: Pointer<T>,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     tail: Pointer<T>,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `element`, `next`, and `prev` are never read
[INFO] [stdout]   --> src/m13_double_linked_list.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 9  | struct Node<T> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 10 |     element: T,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 11 |     next: Pointer<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 12 |     prev: Pointer<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/m13_double_linked_list.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl<T: std::fmt::Display> Node<T> {
[INFO] [stdout]    | ---------------------------------- associated function in this implementation
[INFO] [stdout] 18 |     fn new(element: T) -> Rc<RefCell<Node<T>>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `push_front` is never used
[INFO] [stdout]   --> src/m13_double_linked_list.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl<T: std::fmt::Display> List<T> {
[INFO] [stdout]    | ---------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 35 |     fn push_front(&mut self, element: T) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Green`, `Blue`, and `Silver` are never constructed
[INFO] [stdout]  --> src/m1_enums.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum CarColour {
[INFO] [stdout]   |      --------- variants in this enum
[INFO] [stdout] 3 |     Red,
[INFO] [stdout] 4 |     Green,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     Blue,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     Silver,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `CarColour` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Train` and `Air` are never constructed
[INFO] [stdout]   --> src/m1_enums.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum Conveyance {
[INFO] [stdout]    |      ---------- variants in this enum
[INFO] [stdout] 25 |     Car = 15,
[INFO] [stdout] 26 |     Train = 20,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 27 |     Air = 30,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Conveyance` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `email` and `active` are never read
[INFO] [stdout]  --> src/m2_structs.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     username: String,
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout] 6 |     active: bool,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` 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 items `change_email` and `change_username` are never used
[INFO] [stdout]   --> src/m2_structs.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl User {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn change_email(&mut self, new_email: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn change_username(user: &mut User, new_username: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Warrior` and `Wizard` are never constructed
[INFO] [stdout]   --> src/m3_trait.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | enum Character {
[INFO] [stdout]    |      --------- variants in this enum
[INFO] [stdout] 12 |     Warrior,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 13 |     Archer,
[INFO] [stdout] 14 |     Wizard,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Character` 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 `test_lifetime` is never used
[INFO] [stdout]  --> src/m5_lifetimes.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn test_lifetime() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/m5_lifetimes.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn largest<'a, T: PartialOrd>(compare_1: &'a T, compare_2: &'a T) -> &'a T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/m5_lifetimes.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Person<'b> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `allowance` is never used
[INFO] [stdout]  --> src/m9_mods.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn allowance() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Conveyance` is never used
[INFO] [stdout]  --> src/m9_mods.rs:2:14
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub enum Conveyance {
[INFO] [stdout]   |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/m1_enums.rs:94:9
[INFO] [stdout]    |
[INFO] [stdout] 94 |         dbg!(is_under_five_res_buil_in);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 48 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 9.28s
[INFO] running `Command { std: "docker" "inspect" "7f6d9dbb4c4f73a102e43be602dab74a13b2695f7a7c1370b3727b9689a9cc55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f6d9dbb4c4f73a102e43be602dab74a13b2695f7a7c1370b3727b9689a9cc55", kill_on_drop: false }`
[INFO] [stdout] 7f6d9dbb4c4f73a102e43be602dab74a13b2695f7a7c1370b3727b9689a9cc55
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f30dbc81a3ec7f1d323986608a267f097f7cda1c2882eae8c123bdfffdd08041
[INFO] running `Command { std: "docker" "start" "-a" "f30dbc81a3ec7f1d323986608a267f097f7cda1c2882eae8c123bdfffdd08041", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `List::Cons`
[INFO] [stderr]   --> src/m11_custom_smart_pointers.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |     use List::Cons;
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `linked_list` should have an upper camel case name
[INFO] [stderr]  --> src/m12_linked_list.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | struct linked_list {
[INFO] [stderr]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `LinkedList`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `pointer` should have an upper camel case name
[INFO] [stderr]   --> src/m12_linked_list.rs:12:6
[INFO] [stderr]    |
[INFO] [stderr] 12 | type pointer = Option<Box<Node>>;
[INFO] [stderr]    |      ^^^^^^^ help: convert the identifier to upper camel case: `Pointer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition: `input`
[INFO] [stderr]   --> src/m14_macros.rs:25:14
[INFO] [stderr]    |
[INFO] [stderr] 25 | macro_rules! input {
[INFO] [stderr]    |              ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]   --> src/m14_macros.rs:20:38
[INFO] [stderr]    |
[INFO] [stderr] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stderr]    |                                      ^ help: remove this semicolon
[INFO] [stderr] ...
[INFO] [stderr] 72 |         let str_null = string_concat!();
[INFO] [stderr]    |                        ---------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stderr]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]   --> src/m14_macros.rs:20:38
[INFO] [stderr]    |
[INFO] [stderr] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stderr]    |                                      ^ help: remove this semicolon
[INFO] [stderr] ...
[INFO] [stderr] 73 |         let str_single = string_concat!("First");
[INFO] [stderr]    |                          ----------------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]   --> src/m14_macros.rs:20:38
[INFO] [stderr]    |
[INFO] [stderr] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stderr]    |                                      ^ help: remove this semicolon
[INFO] [stderr] ...
[INFO] [stderr] 75 |         let str_multiple = string_concat!("Firts","Second");
[INFO] [stderr]    |                            -------------------------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ethers::types::Res`
[INFO] [stderr]   --> src/m7_async.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     use ethers::types::Res;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `stack_ref`
[INFO] [stderr]   --> src/m10_smart_pointers.rs:20:13
[INFO] [stderr]    |
[INFO] [stderr] 20 |         let stack_ref = &stack_var;
[INFO] [stderr]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stack_ref`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `heap_var`
[INFO] [stderr]   --> src/m10_smart_pointers.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 |         let heap_var = Box::new(stack_var);
[INFO] [stderr]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heap_var`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/m12_reference_counting_pointer.rs:20:13
[INFO] [stderr]    |
[INFO] [stderr] 20 |         let b = Rc::new(Cons(3, Rc::clone(&a)));
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/m12_reference_counting_pointer.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |         let c = Rc::new(Cons(4, Rc::clone(&a)));
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list1`
[INFO] [stderr]   --> src/m13_double_linked_list.rs:59:17
[INFO] [stderr]    |
[INFO] [stderr] 59 |         let mut list1: List<i32> = List::new();
[INFO] [stderr]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_list1`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/m13_double_linked_list.rs:59:13
[INFO] [stderr]    |
[INFO] [stderr] 59 |         let mut list1: List<i32> = List::new();
[INFO] [stderr]    |             ----^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `str_null`
[INFO] [stderr]   --> src/m14_macros.rs:72:13
[INFO] [stderr]    |
[INFO] [stderr] 72 |         let str_null = string_concat!();
[INFO] [stderr]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_null`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `str_single`
[INFO] [stderr]   --> src/m14_macros.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |         let str_single = string_concat!("First");
[INFO] [stderr]    |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_single`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `str_multiple`
[INFO] [stderr]   --> src/m14_macros.rs:75:13
[INFO] [stderr]    |
[INFO] [stderr] 75 |         let str_multiple = string_concat!("Firts","Second");
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_multiple`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `some_var`
[INFO] [stderr]   --> src/m14_macros.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 |         let some_var = mad_skills!(i32);
[INFO] [stderr]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_var`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/m14_macros.rs:78:17
[INFO] [stderr]    |
[INFO] [stderr] 78 |         let mut x: Vec<i32>  = vec!();
[INFO] [stderr]    |                 ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/m14_macros.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let mut temp_str = String::new();
[INFO] [stderr]    |             ----^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] ...
[INFO] [stderr] 72 |         let str_null = string_concat!();
[INFO] [stderr]    |                        ---------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/m14_macros.rs:78:13
[INFO] [stderr]    |
[INFO] [stderr] 78 |         let mut x: Vec<i32>  = vec!();
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/m14_macros.rs:79:13
[INFO] [stderr]    |
[INFO] [stderr] 79 |         let mut y = my_vec!(1,2,3,4);
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `addr`
[INFO] [stderr]   --> src/m4_polymorphism.rs:35:13
[INFO] [stderr]    |
[INFO] [stderr] 35 |         let addr: Address =
[INFO] [stderr]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `alice_check`
[INFO] [stderr]   --> src/m5_lifetimes.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |         let alice_check = largest(&check_ag, alice.points);
[INFO] [stderr]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_alice_check`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `prob_none`
[INFO] [stderr]   --> src/m6_patterns.rs:46:13
[INFO] [stderr]    |
[INFO] [stderr] 46 |         let prob_none: Option<i32> = None;
[INFO] [stderr]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prob_none`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `person1`
[INFO] [stderr]   --> src/m8_collections.rs:12:13
[INFO] [stderr]    |
[INFO] [stderr] 12 |         let person1 = "alice";
[INFO] [stderr]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_person1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `person2`
[INFO] [stderr]   --> src/m8_collections.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |         let person2 = "bob";
[INFO] [stderr]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_person2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `travel_1`
[INFO] [stderr]   --> src/m9_mods.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let travel_1 = travel_history::Conveyance::Car;
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `travel_2`
[INFO] [stderr]   --> src/m9_mods.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let travel_2 = travel_history::Conveyance::Air;
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `area_rect1`
[INFO] [stderr]   --> src/main.rs:99:9
[INFO] [stderr]    |
[INFO] [stderr] 99 |     let area_rect1 = math_funcs::rect_area(&rect1.length, &rect1.width);
[INFO] [stderr]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_area_rect1`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:79:9
[INFO] [stderr]    |
[INFO] [stderr] 79 |     let mut f = min;
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:80:9
[INFO] [stderr]    |
[INFO] [stderr] 80 |     let mut m = max;
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `Cons` is never constructed
[INFO] [stderr]   --> src/m11_custom_smart_pointers.rs:62:5
[INFO] [stderr]    |
[INFO] [stderr] 61 | enum List {
[INFO] [stderr]    |      ---- variant in this enum
[INFO] [stderr] 62 |     Cons(i32, Option<Box<List>>),
[INFO] [stderr]    |     ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `head` and `tail` are never read
[INFO] [stderr]  --> src/m13_double_linked_list.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct List<T> {
[INFO] [stderr]   |        ---- fields in this struct
[INFO] [stderr] 5 |     head: Pointer<T>,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 6 |     tail: Pointer<T>,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `element`, `next`, and `prev` are never read
[INFO] [stderr]   --> src/m13_double_linked_list.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 9  | struct Node<T> {
[INFO] [stderr]    |        ---- fields in this struct
[INFO] [stderr] 10 |     element: T,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 11 |     next: Pointer<T>,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 12 |     prev: Pointer<T>,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/m13_double_linked_list.rs:18:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | impl<T: std::fmt::Display> Node<T> {
[INFO] [stderr]    | ---------------------------------- associated function in this implementation
[INFO] [stderr] 18 |     fn new(element: T) -> Rc<RefCell<Node<T>>> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `push_front` is never used
[INFO] [stderr]   --> src/m13_double_linked_list.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 27 | impl<T: std::fmt::Display> List<T> {
[INFO] [stderr]    | ---------------------------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 35 |     fn push_front(&mut self, element: T) {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Green`, `Blue`, and `Silver` are never constructed
[INFO] [stderr]  --> src/m1_enums.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | enum CarColour {
[INFO] [stderr]   |      --------- variants in this enum
[INFO] [stderr] 3 |     Red,
[INFO] [stderr] 4 |     Green,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 5 |     Blue,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 6 |     Silver,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `CarColour` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Train` and `Air` are never constructed
[INFO] [stderr]   --> src/m1_enums.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 24 | enum Conveyance {
[INFO] [stderr]    |      ---------- variants in this enum
[INFO] [stderr] 25 |     Car = 15,
[INFO] [stderr] 26 |     Train = 20,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 27 |     Air = 30,
[INFO] [stderr]    |     ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Conveyance` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: fields `email` and `active` are never read
[INFO] [stderr]  --> src/m2_structs.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | struct User {
[INFO] [stderr]   |        ---- fields in this struct
[INFO] [stderr] 3 |     username: String,
[INFO] [stderr] 4 |     email: String,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 5 |     sign_in_count: u64,
[INFO] [stderr] 6 |     active: bool,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `change_email` and `change_username` are never used
[INFO] [stderr]   --> src/m2_structs.rs:21:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | impl User {
[INFO] [stderr]    | --------- associated items in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 21 |     fn change_email(&mut self, new_email: &str) {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 25 |     fn change_username(user: &mut User, new_username: &str) {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Warrior` and `Wizard` are never constructed
[INFO] [stderr]   --> src/m3_trait.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | enum Character {
[INFO] [stderr]    |      --------- variants in this enum
[INFO] [stderr] 12 |     Warrior,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 13 |     Archer,
[INFO] [stderr] 14 |     Wizard,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Character` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_lifetime` is never used
[INFO] [stderr]  --> src/m5_lifetimes.rs:2:4
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn test_lifetime() {
[INFO] [stderr]   |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `largest` is never used
[INFO] [stderr]   --> src/m5_lifetimes.rs:26:4
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn largest<'a, T: PartialOrd>(compare_1: &'a T, compare_2: &'a T) -> &'a T {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Person` is never constructed
[INFO] [stderr]   --> src/m5_lifetimes.rs:34:8
[INFO] [stderr]    |
[INFO] [stderr] 34 | struct Person<'b> {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `allowance` is never used
[INFO] [stderr]  --> src/m9_mods.rs:9:8
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub fn allowance() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Conveyance` is never used
[INFO] [stderr]  --> src/m9_mods.rs:2:14
[INFO] [stderr]   |
[INFO] [stderr] 2 |     pub enum Conveyance {
[INFO] [stderr]   |              ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/m1_enums.rs:94:9
[INFO] [stderr]    |
[INFO] [stderr] 94 |         dbg!(is_under_five_res_buil_in);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: `playground` (bin "playground" test) generated 48 warnings (run `cargo fix --bin "playground" --tests` to apply 26 suggestions)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.57s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/playground-b2fe336da02d540e)
[INFO] [stdout] 
[INFO] [stdout] running 16 tests
[INFO] [stdout] test m11_custom_smart_pointers::test::test_custom_smart_pointer_2 ... ok
[INFO] [stdout] test m14_macros::test::test_macro ... ok
[INFO] [stdout] test m4_polymorphism::test::test_poly ... ok
[INFO] [stdout] test m1_enums::test::test_enums ... ok
[INFO] [stdout] test m12_linked_list::test::test_linked_list ... ok
[INFO] [stdout] test m6_patterns::test::test_large_enum ... ok
[INFO] [stdout] test m10_smart_pointers::test::test_smart_pointer ... ok
[INFO] [stdout] test m2_structs::test::tests_struct ... ok
[INFO] [stdout] test m13_double_linked_list::test::test_dbl_list ... ok
[INFO] [stdout] test m3_trait::test::test_traits ... ok
[INFO] [stdout] test m8_collections::test::tests_hashset ... ok
[INFO] [stdout] test m6_patterns::test::test_match_literals ... ok
[INFO] [stdout] test m6_patterns::test::test_match_option ... ok
[INFO] [stdout] test m12_reference_counting_pointer::test::test_rc_pointer ... ok
[INFO] [stdout] test m8_collections::test::tests_hashmap ... ok
[INFO] [stdout] test m7_async::tests::test_calls_async_fn ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- m7_async::tests::test_calls_async_fn stdout ----
[INFO] [stdout] thread 'm7_async::tests::test_calls_async_fn' panicked at src/m7_async.rs:34:17:
[INFO] [stdout] failed to make api request
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x560afeac4bec - std::backtrace_rs::backtrace::libunwind::trace::ha637c64ce894333a
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
[INFO] [stdout]    1:     0x560afeac4bec - std::backtrace_rs::backtrace::trace_unsynchronized::h47f62dea28e0c88d
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stdout]    2:     0x560afeac4bec - std::sys_common::backtrace::_print_fmt::h9eef0abe20ede486
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:67:5
[INFO] [stdout]    3:     0x560afeac4bec - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hed7f999df88cc644
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stdout]    4:     0x560afeaf2b60 - core::fmt::rt::Argument::fmt::h1539a9308b8d058d
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/fmt/rt.rs:142:9
[INFO] [stdout]    5:     0x560afeaf2b60 - core::fmt::write::h3a39390d8560d9c9
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/fmt/mod.rs:1120:17
[INFO] [stdout]    6:     0x560afeac1a9f - std::io::Write::write_fmt::h040b369f3a0f9cbc
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/io/mod.rs:1762:15
[INFO] [stdout]    7:     0x560afeac49d4 - std::sys_common::backtrace::_print::h894006fb5c6f3d45
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stdout]    8:     0x560afeac49d4 - std::sys_common::backtrace::print::h23a2d212c6fff936
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stdout]    9:     0x560afeac6697 - std::panicking::default_hook::{{closure}}::h8a1d2ee00185001a
[INFO] [stdout]   10:     0x560afeac6383 - std::panicking::default_hook::h6038f2eba384e475
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:289:9
[INFO] [stdout]   11:     0x560afe4a2a77 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0ad024c9bdc6d768
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2021:9
[INFO] [stdout]   12:     0x560afe4a2a77 - test::test_main::{{closure}}::h7500b54257359db6
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:138:21
[INFO] [stdout]   13:     0x560afeac6ca8 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h1f8f335eaa9cfaee
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2021:9
[INFO] [stdout]   14:     0x560afeac6ca8 - std::panicking::rust_panic_with_hook::h2b5517d590cab22e
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:783:13
[INFO] [stdout]   15:     0x560afeac69c9 - std::panicking::begin_panic_handler::{{closure}}::h233112c06e0ef43e
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:649:13
[INFO] [stdout]   16:     0x560afeac50b6 - std::sys_common::backtrace::__rust_end_short_backtrace::h6e893f24d7ebbff8
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:170:18
[INFO] [stdout]   17:     0x560afeac6762 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:645:5
[INFO] [stdout]   18:     0x560afe45b695 - core::panicking::panic_fmt::hbf0e066aabfa482c
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panicking.rs:72:14
[INFO] [stdout]   19:     0x560afe4662e4 - playground::m7_async::tests::test_calls_async_fn::{{closure}}::hb5f3c3540b6b3afe
[INFO] [stdout]                                at /opt/rustwide/workdir/src/m7_async.rs:34:17
[INFO] [stdout]   20:     0x560afe469658 - <core::pin::Pin<P> as core::future::future::Future>::poll::h2b0992394b3b586b
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/future/future.rs:125:9
[INFO] [stdout]   21:     0x560afe4696ab - <core::pin::Pin<P> as core::future::future::Future>::poll::h4102acd28a271a71
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/future/future.rs:125:9
[INFO] [stdout]   22:     0x560afe4618f4 - tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}::{{closure}}::h1576486ab1b6a5f4
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:665:57
[INFO] [stdout]   23:     0x560afe46181a - tokio::runtime::coop::with_budget::h10a39b9f7d1a5f4f
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/coop.rs:107:5
[INFO] [stdout]   24:     0x560afe46181a - tokio::runtime::coop::budget::hf9e26026fc8470f4
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/coop.rs:73:5
[INFO] [stdout]   25:     0x560afe46181a - tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}::h096bfac8c1f704fd
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:665:25
[INFO] [stdout]   26:     0x560afe4601ac - tokio::runtime::scheduler::current_thread::Context::enter::h1707f4ab44f25758
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:410:19
[INFO] [stdout]   27:     0x560afe46101e - tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::h6a084c593215a5af
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:664:36
[INFO] [stdout]   28:     0x560afe460d2b - tokio::runtime::scheduler::current_thread::CoreGuard::enter::{{closure}}::h0e97c2efab20d944
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:743:68
[INFO] [stdout]   29:     0x560afe45f22b - tokio::runtime::context::scoped::Scoped<T>::set::ha74518e314081de2
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/context/scoped.rs:40:9
[INFO] [stdout]   30:     0x560afe4686e9 - tokio::runtime::context::set_scheduler::{{closure}}::h907fe798fbb71d33
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/context.rs:176:26
[INFO] [stdout]   31:     0x560afe4669c6 - std::thread::local::LocalKey<T>::try_with::ha32a986fc0b96c86
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/local.rs:270:16
[INFO] [stdout]   32:     0x560afe46642a - std::thread::local::LocalKey<T>::with::hfb783164e51a89e8
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/local.rs:246:9
[INFO] [stdout]   33:     0x560afe46869d - tokio::runtime::context::set_scheduler::hb13565c5f90fb756
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/context.rs:176:9
[INFO] [stdout]   34:     0x560afe460ac0 - tokio::runtime::scheduler::current_thread::CoreGuard::enter::h783f4b6b3e1afde1
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:743:27
[INFO] [stdout]   35:     0x560afe460d5d - tokio::runtime::scheduler::current_thread::CoreGuard::block_on::h285d766a7fd8b060
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:652:19
[INFO] [stdout]   36:     0x560afe45fc8d - tokio::runtime::scheduler::current_thread::CurrentThread::block_on::{{closure}}::hfb6419246dbcdca8
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:175:28
[INFO] [stdout]   37:     0x560afe45f3ca - tokio::runtime::context::runtime::enter_runtime::h8b539cc301566b9e
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/context/runtime.rs:65:16
[INFO] [stdout]   38:     0x560afe45fba0 - tokio::runtime::scheduler::current_thread::CurrentThread::block_on::hde0047f1e247aac3
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:167:9
[INFO] [stdout]   39:     0x560afe468b2d - tokio::runtime::runtime::Runtime::block_on::h07092a71bbe4736a
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/runtime.rs:347:47
[INFO] [stdout]   40:     0x560afe465d18 - playground::m7_async::tests::test_calls_async_fn::h46c8e011cdb7c984
[INFO] [stdout]                                at /opt/rustwide/workdir/src/m7_async.rs:29:9
[INFO] [stdout]   41:     0x560afe465ba7 - playground::m7_async::tests::test_calls_async_fn::{{closure}}::h5fe17726eb01a2aa
[INFO] [stdout]                                at /opt/rustwide/workdir/src/m7_async.rs:24:35
[INFO] [stdout]   42:     0x560afe45cc96 - core::ops::function::FnOnce::call_once::h86c5c1d671093db9
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   43:     0x560afe4a80cf - core::ops::function::FnOnce::call_once::h2b5d431d5046312d
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   44:     0x560afe4a80cf - test::__rust_begin_short_backtrace::h7714669af176e207
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:628:18
[INFO] [stdout]   45:     0x560afe4a70e5 - test::run_test_in_process::{{closure}}::h85218797dcbcec12
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:651:60
[INFO] [stdout]   46:     0x560afe4a70e5 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h76c106ea31c14d7b
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   47:     0x560afe4a70e5 - std::panicking::try::do_call::h3bd5d0f6620ee946
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:552:40
[INFO] [stdout]   48:     0x560afe4a70e5 - std::panicking::try::h232e535e4744fe31
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:516:19
[INFO] [stdout]   49:     0x560afe4a70e5 - std::panic::catch_unwind::h3ce3bd6ca8dbac68
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panic.rs:142:14
[INFO] [stdout]   50:     0x560afe4a70e5 - test::run_test_in_process::hc97b257c9621286a
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:651:27
[INFO] [stdout]   51:     0x560afe4a70e5 - test::run_test::{{closure}}::h2aa798823a438d38
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:574:43
[INFO] [stdout]   52:     0x560afe46f3a6 - test::run_test::{{closure}}::h87d231c78fb59832
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/test/src/lib.rs:602:41
[INFO] [stdout]   53:     0x560afe46f3a6 - std::sys_common::backtrace::__rust_begin_short_backtrace::he6df152596625789
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys_common/backtrace.rs:154:18
[INFO] [stdout]   54:     0x560afe474457 - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::ha94be15d1e0acf36
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/mod.rs:529:17
[INFO] [stdout]   55:     0x560afe474457 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h9dc6bd6372f16606
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   56:     0x560afe474457 - std::panicking::try::do_call::h9057517f80303cd4
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:552:40
[INFO] [stdout]   57:     0x560afe474457 - std::panicking::try::he3a30b11ee45340c
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:516:19
[INFO] [stdout]   58:     0x560afe474457 - std::panic::catch_unwind::h410458cfd3528b8b
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panic.rs:142:14
[INFO] [stdout]   59:     0x560afe474457 - std::thread::Builder::spawn_unchecked_::{{closure}}::h72ac3bdb567b737b
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/thread/mod.rs:528:30
[INFO] [stdout]   60:     0x560afe474457 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h38f34da3654a8344
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   61:     0x560afeacb9c5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc7eafaff61e32df9
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2007:9
[INFO] [stdout]   62:     0x560afeacb9c5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6ba4a5de48dd2304
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/alloc/src/boxed.rs:2007:9
[INFO] [stdout]   63:     0x560afeacb9c5 - std::sys::unix::thread::Thread::new::thread_start::he469335aef763e45
[INFO] [stdout]                                at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/sys/unix/thread.rs:108:17
[INFO] [stdout]   64:     0x7f6868dc1ac3 - <unknown>
[INFO] [stdout]   65:     0x7f6868e52bf4 - __clone
[INFO] [stdout]   66:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     m7_async::tests::test_calls_async_fn
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 15 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.28s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass `--bin playground`
[INFO] running `Command { std: "docker" "inspect" "f30dbc81a3ec7f1d323986608a267f097f7cda1c2882eae8c123bdfffdd08041", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f30dbc81a3ec7f1d323986608a267f097f7cda1c2882eae8c123bdfffdd08041", kill_on_drop: false }`
[INFO] [stdout] f30dbc81a3ec7f1d323986608a267f097f7cda1c2882eae8c123bdfffdd08041
[INFO] testing Legend101Zz/rust-bot against beta-2023-12-22 for beta-1.76-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLegend101Zz%2Frust-bot" "/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/Legend101Zz/rust-bot on toolchain beta-2023-12-22
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-12-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Legend101Zz/rust-bot
[INFO] finished tweaking git repo https://github.com/Legend101Zz/rust-bot
[INFO] tweaked toml for git repo https://github.com/Legend101Zz/rust-bot written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Legend101Zz/rust-bot 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" "+beta-2023-12-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] df7717d6ea88d2131bf4179a4ca39b17555ab363b320bd21e13c5fe63a56edf0
[INFO] running `Command { std: "docker" "start" "-a" "df7717d6ea88d2131bf4179a4ca39b17555ab363b320bd21e13c5fe63a56edf0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "df7717d6ea88d2131bf4179a4ca39b17555ab363b320bd21e13c5fe63a56edf0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df7717d6ea88d2131bf4179a4ca39b17555ab363b320bd21e13c5fe63a56edf0", kill_on_drop: false }`
[INFO] [stdout] df7717d6ea88d2131bf4179a4ca39b17555ab363b320bd21e13c5fe63a56edf0
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 70c83bd68b1a080d669b633c7f7038b692ff8432ce3cb6e24f01791586f69f57
[INFO] running `Command { std: "docker" "start" "-a" "70c83bd68b1a080d669b633c7f7038b692ff8432ce3cb6e24f01791586f69f57", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.68
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling serde v1.0.188
[INFO] [stderr]    Compiling once_cell v1.18.0
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling libc v0.2.148
[INFO] [stderr]    Compiling subtle v2.5.0
[INFO] [stderr]    Compiling const-oid v0.9.5
[INFO] [stderr]    Compiling zeroize v1.6.0
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling equivalent v1.0.1
[INFO] [stderr]    Compiling hashbrown v0.14.1
[INFO] [stderr]    Compiling itoa v1.0.9
[INFO] [stderr]    Compiling winnow v0.5.16
[INFO] [stderr]    Compiling cpufeatures v0.2.9
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[INFO] [stdout] warning: type `linked_list` should have an upper camel case name
[INFO] [stdout]  --> src/m12_linked_list.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct linked_list {
[INFO] [stdout]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `LinkedList`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `pointer` should have an upper camel case name
[INFO] [stdout]   --> src/m12_linked_list.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | type pointer = Option<Box<Node>>;
[INFO] [stdout]    |      ^^^^^^^ help: convert the identifier to upper camel case: `Pointer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cons`, `Nil`
[INFO] [stdout]  --> src/m12_reference_counting_pointer.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | use List::{Cons, Nil};
[INFO] [stdout]   |            ^^^^  ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `mad_skills`
[INFO] [stdout]  --> src/m14_macros.rs:1:14
[INFO] [stdout]   |
[INFO] [stdout] 1 | macro_rules! mad_skills {
[INFO] [stdout]   |              ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `string_concat`
[INFO] [stdout]   --> src/m14_macros.rs:14:14
[INFO] [stdout]    |
[INFO] [stdout] 14 | macro_rules! string_concat {
[INFO] [stdout]    |              ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `input`
[INFO] [stdout]   --> src/m14_macros.rs:25:14
[INFO] [stdout]    |
[INFO] [stdout] 25 | macro_rules! input {
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `my_vec`
[INFO] [stdout]   --> src/m14_macros.rs:38:14
[INFO] [stdout]    |
[INFO] [stdout] 38 | macro_rules! my_vec {
[INFO] [stdout]    |              ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `HashMap`, `HashSet`
[INFO] [stdout]  --> src/m8_collections.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                        ^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alice_check`
[INFO] [stdout]   --> src/m5_lifetimes.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let alice_check = largest(&check_ag, alice.points);
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_alice_check`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `travel_1`
[INFO] [stdout]   --> src/m9_mods.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let travel_1 = travel_history::Conveyance::Car;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `travel_2`
[INFO] [stdout]   --> src/m9_mods.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let travel_2 = travel_history::Conveyance::Air;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `area_rect1`
[INFO] [stdout]   --> src/main.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let area_rect1 = math_funcs::rect_area(&rect1.length, &rect1.width);
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_area_rect1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let mut f = min;
[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/main.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut m = max;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Cons` and `Nil` are never constructed
[INFO] [stdout]  --> src/m10_smart_pointers.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum List {
[INFO] [stdout]   |      ---- variants in this enum
[INFO] [stdout] 3 |     Cons(i32, Box<List>),
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 4 |     Nil,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Cons` is never constructed
[INFO] [stdout]   --> src/m11_custom_smart_pointers.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 61 | enum List {
[INFO] [stdout]    |      ---- variant in this enum
[INFO] [stdout] 62 |     Cons(i32, Option<Box<List>>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` 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 function `new` is never used
[INFO] [stdout]   --> src/m11_custom_smart_pointers.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 69 | impl<T: std::fmt::Debug> MySmartPointer<T> {
[INFO] [stdout]    | ------------------------------------------ associated function in this implementation
[INFO] [stdout] 70 |     fn new(x: T) -> MySmartPointer<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `my_fn` is never used
[INFO] [stdout]   --> src/m11_custom_smart_pointers.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn my_fn(str: &str) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `head` is never read
[INFO] [stdout]  --> src/m12_linked_list.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct linked_list {
[INFO] [stdout]   |        ----------- field in this struct
[INFO] [stdout] 3 |     head: pointer,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `linked_list` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `element` and `next` are never read
[INFO] [stdout]  --> src/m12_linked_list.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Node {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 8 |     element: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 9 |     next: pointer,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Node` 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 items `create_empty_list`, `add`, and `remove` are never used
[INFO] [stdout]   --> src/m12_linked_list.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl linked_list {
[INFO] [stdout]    | ---------------- associated items in this implementation
[INFO] [stdout] 15 |     fn create_empty_list() -> linked_list {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     fn add(&mut self, element: i32) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     fn remove(&mut self) -> Option<i32> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]  --> src/m12_reference_counting_pointer.rs:3:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum List {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `List` is never constructed
[INFO] [stdout]  --> src/m13_double_linked_list.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct List<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/m13_double_linked_list.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Node<T> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Pointer` is never used
[INFO] [stdout]   --> src/m13_double_linked_list.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | type Pointer<T> = Option<Rc<RefCell<Node<T>>>>;
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/m13_double_linked_list.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl<T: std::fmt::Display> Node<T> {
[INFO] [stdout]    | ---------------------------------- associated function in this implementation
[INFO] [stdout] 18 |     fn new(element: T) -> Rc<RefCell<Node<T>>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `push_front` are never used
[INFO] [stdout]   --> src/m13_double_linked_list.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl<T: std::fmt::Display> List<T> {
[INFO] [stdout]    | ---------------------------------- associated items in this implementation
[INFO] [stdout] 28 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 35 |     fn push_front(&mut self, element: T) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Red`, `Green`, `Blue`, and `Silver` are never constructed
[INFO] [stdout]  --> src/m1_enums.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum CarColour {
[INFO] [stdout]   |      --------- variants in this enum
[INFO] [stdout] 3 |     Red,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 4 |     Green,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     Blue,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     Silver,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `CarColour` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Ok` and `Err` are never constructed
[INFO] [stdout]   --> src/m1_enums.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum GivenResult<T, E> {
[INFO] [stdout]    |      ----------- variants in this enum
[INFO] [stdout] 11 |     Ok(T),
[INFO] [stdout]    |     ^^
[INFO] [stdout] 12 |     Err(E),
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `GivenResult` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `None` and `Some` are never constructed
[INFO] [stdout]   --> src/m1_enums.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | enum GivenOptions<T> {
[INFO] [stdout]    |      ------------ variants in this enum
[INFO] [stdout] 18 |     None,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 19 |     Some(T),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `GivenOptions` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Car`, `Train`, and `Air` are never constructed
[INFO] [stdout]   --> src/m1_enums.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum Conveyance {
[INFO] [stdout]    |      ---------- variants in this enum
[INFO] [stdout] 25 |     Car = 15,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 26 |     Train = 20,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 27 |     Air = 30,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Conveyance` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `travel_allowance` is never used
[INFO] [stdout]   --> src/m1_enums.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | impl Conveyance {
[INFO] [stdout]    | --------------- method in this implementation
[INFO] [stdout] 31 |     fn travel_allowance(&self, miles: i32) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `check_under_five` is never used
[INFO] [stdout]   --> src/m1_enums.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn check_under_five(num_check: u8) -> GivenResult<u8, String> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `check_under_five_built_in` is never used
[INFO] [stdout]   --> src/m1_enums.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn check_under_five_built_in(num_check: u8) -> Result<u8, String> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `remainder_zero` is never used
[INFO] [stdout]   --> src/m1_enums.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn remainder_zero(num_check: f32) -> GivenOptions<f32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `handle_car_colour_red` is never used
[INFO] [stdout]   --> src/m1_enums.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn handle_car_colour_red() -> CarColour {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `username`, `email`, `sign_in_count`, and `active` are never read
[INFO] [stdout]  --> src/m2_structs.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     username: String,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 6 |     active: bool,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` 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 `square` is never used
[INFO] [stdout]  --> src/m2_structs.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn square<T>(num: T) -> T
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `increment_signin_count`, `change_email`, and `change_username` are never used
[INFO] [stdout]   --> src/m2_structs.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl User {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 17 |     fn increment_signin_count(&mut self) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn change_email(&mut self, new_email: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn change_username(user: &mut User, new_username: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change_username` is never used
[INFO] [stdout]   --> src/m2_structs.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn change_username(user: &mut User, new_username: &str) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Warrior`, `Archer`, and `Wizard` are never constructed
[INFO] [stdout]   --> src/m3_trait.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | enum Character {
[INFO] [stdout]    |      --------- variants in this enum
[INFO] [stdout] 12 |     Warrior,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 13 |     Archer,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 14 |     Wizard,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Character` 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 `get_ethereum_data` is never used
[INFO] [stdout]   --> src/m4_polymorphism.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn get_ethereum_data<T: EthereumAddress>(address: T) -> Address {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_lifetime` is never used
[INFO] [stdout]  --> src/m5_lifetimes.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn test_lifetime() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/m5_lifetimes.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn largest<'a, T: PartialOrd>(compare_1: &'a T, compare_2: &'a T) -> &'a T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/m5_lifetimes.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Person<'b> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Quit`, `ChangeColor`, `Move`, and `Write` are never constructed
[INFO] [stdout]  --> src/m6_patterns.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Message {
[INFO] [stdout]   |      ------- variants in this enum
[INFO] [stdout] 3 |     Quit,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 4 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 5 |     Move { x: i32, y: i32 },
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     Write(String),
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Message` 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 `process_message` is never used
[INFO] [stdout]  --> src/m6_patterns.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn process_message(msg: Message) {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `my_async_call` is never used
[INFO] [stdout]  --> src/m7_async.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | async fn my_async_call(url: &str) -> Result<serde_json::Value, Error> {
[INFO] [stdout]   |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `allowance` is never used
[INFO] [stdout]  --> src/m9_mods.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn allowance() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Conveyance` is never used
[INFO] [stdout]  --> src/m9_mods.rs:2:14
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub enum Conveyance {
[INFO] [stdout]   |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 50 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 35s
[INFO] running `Command { std: "docker" "inspect" "70c83bd68b1a080d669b633c7f7038b692ff8432ce3cb6e24f01791586f69f57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70c83bd68b1a080d669b633c7f7038b692ff8432ce3cb6e24f01791586f69f57", kill_on_drop: false }`
[INFO] [stdout] 70c83bd68b1a080d669b633c7f7038b692ff8432ce3cb6e24f01791586f69f57
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aa1c90d2267bd5d958ac20dabab71f08719e0d034002360a33e89fc44b2ede86
[INFO] running `Command { std: "docker" "start" "-a" "aa1c90d2267bd5d958ac20dabab71f08719e0d034002360a33e89fc44b2ede86", kill_on_drop: false }`
[INFO] [stderr]    Compiling playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `List::Cons`
[INFO] [stdout]   --> src/m11_custom_smart_pointers.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     use List::Cons;
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `linked_list` should have an upper camel case name
[INFO] [stdout]  --> src/m12_linked_list.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct linked_list {
[INFO] [stdout]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `LinkedList`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `pointer` should have an upper camel case name
[INFO] [stdout]   --> src/m12_linked_list.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | type pointer = Option<Box<Node>>;
[INFO] [stdout]    |      ^^^^^^^ help: convert the identifier to upper camel case: `Pointer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition: `input`
[INFO] [stdout]   --> src/m14_macros.rs:25:14
[INFO] [stdout]    |
[INFO] [stdout] 25 | macro_rules! input {
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/m14_macros.rs:20:38
[INFO] [stdout]    |
[INFO] [stdout] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stdout]    |                                      ^ help: remove this semicolon
[INFO] [stdout] ...
[INFO] [stdout] 72 |         let str_null = string_concat!();
[INFO] [stdout]    |                        ---------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/m14_macros.rs:20:38
[INFO] [stdout]    |
[INFO] [stdout] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stdout]    |                                      ^ help: remove this semicolon
[INFO] [stdout] ...
[INFO] [stdout] 73 |         let str_single = string_concat!("First");
[INFO] [stdout]    |                          ----------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/m14_macros.rs:20:38
[INFO] [stdout]    |
[INFO] [stdout] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stdout]    |                                      ^ help: remove this semicolon
[INFO] [stdout] ...
[INFO] [stdout] 75 |         let str_multiple = string_concat!("Firts","Second");
[INFO] [stdout]    |                            -------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ethers::types::Res`
[INFO] [stdout]   --> src/m7_async.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     use ethers::types::Res;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stack_ref`
[INFO] [stdout]   --> src/m10_smart_pointers.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let stack_ref = &stack_var;
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stack_ref`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `heap_var`
[INFO] [stdout]   --> src/m10_smart_pointers.rs:28:13
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let heap_var = Box::new(stack_var);
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heap_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/m12_reference_counting_pointer.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         let b = Rc::new(Cons(3, Rc::clone(&a)));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/m12_reference_counting_pointer.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 |         let c = Rc::new(Cons(4, Rc::clone(&a)));
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list1`
[INFO] [stdout]   --> src/m13_double_linked_list.rs:59:17
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut list1: List<i32> = List::new();
[INFO] [stdout]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_list1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/m13_double_linked_list.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut list1: List<i32> = List::new();
[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: unused variable: `str_null`
[INFO] [stdout]   --> src/m14_macros.rs:72:13
[INFO] [stdout]    |
[INFO] [stdout] 72 |         let str_null = string_concat!();
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_null`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str_single`
[INFO] [stdout]   --> src/m14_macros.rs:73:13
[INFO] [stdout]    |
[INFO] [stdout] 73 |         let str_single = string_concat!("First");
[INFO] [stdout]    |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_single`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str_multiple`
[INFO] [stdout]   --> src/m14_macros.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |         let str_multiple = string_concat!("Firts","Second");
[INFO] [stdout]    |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_multiple`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_var`
[INFO] [stdout]   --> src/m14_macros.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let some_var = mad_skills!(i32);
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/m14_macros.rs:78:17
[INFO] [stdout]    |
[INFO] [stdout] 78 |         let mut x: Vec<i32>  = vec!();
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/m14_macros.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut temp_str = String::new();
[INFO] [stdout]    |             ----^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 72 |         let str_null = string_concat!();
[INFO] [stdout]    |                        ---------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/m14_macros.rs:78:13
[INFO] [stdout]    |
[INFO] [stdout] 78 |         let mut x: Vec<i32>  = vec!();
[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/m14_macros.rs:79:13
[INFO] [stdout]    |
[INFO] [stdout] 79 |         let mut y = my_vec!(1,2,3,4);
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `addr`
[INFO] [stdout]   --> src/m4_polymorphism.rs:35:13
[INFO] [stdout]    |
[INFO] [stdout] 35 |         let addr: Address =
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_addr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alice_check`
[INFO] [stdout]   --> src/m5_lifetimes.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let alice_check = largest(&check_ag, alice.points);
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_alice_check`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `prob_none`
[INFO] [stdout]   --> src/m6_patterns.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let prob_none: Option<i32> = None;
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prob_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `person1`
[INFO] [stdout]   --> src/m8_collections.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let person1 = "alice";
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_person1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `person2`
[INFO] [stdout]   --> src/m8_collections.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let person2 = "bob";
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_person2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `travel_1`
[INFO] [stdout]   --> src/m9_mods.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let travel_1 = travel_history::Conveyance::Car;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `travel_2`
[INFO] [stdout]   --> src/m9_mods.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let travel_2 = travel_history::Conveyance::Air;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `area_rect1`
[INFO] [stdout]   --> src/main.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let area_rect1 = math_funcs::rect_area(&rect1.length, &rect1.width);
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_area_rect1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let mut f = min;
[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/main.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut m = max;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Cons` is never constructed
[INFO] [stdout]   --> src/m11_custom_smart_pointers.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 61 | enum List {
[INFO] [stdout]    |      ---- variant in this enum
[INFO] [stdout] 62 |     Cons(i32, Option<Box<List>>),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `head` and `tail` are never read
[INFO] [stdout]  --> src/m13_double_linked_list.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct List<T> {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 5 |     head: Pointer<T>,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     tail: Pointer<T>,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `element`, `next`, and `prev` are never read
[INFO] [stdout]   --> src/m13_double_linked_list.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 9  | struct Node<T> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 10 |     element: T,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 11 |     next: Pointer<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 12 |     prev: Pointer<T>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/m13_double_linked_list.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl<T: std::fmt::Display> Node<T> {
[INFO] [stdout]    | ---------------------------------- associated function in this implementation
[INFO] [stdout] 18 |     fn new(element: T) -> Rc<RefCell<Node<T>>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `push_front` is never used
[INFO] [stdout]   --> src/m13_double_linked_list.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl<T: std::fmt::Display> List<T> {
[INFO] [stdout]    | ---------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 35 |     fn push_front(&mut self, element: T) {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Green`, `Blue`, and `Silver` are never constructed
[INFO] [stdout]  --> src/m1_enums.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum CarColour {
[INFO] [stdout]   |      --------- variants in this enum
[INFO] [stdout] 3 |     Red,
[INFO] [stdout] 4 |     Green,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     Blue,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 6 |     Silver,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `CarColour` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Train` and `Air` are never constructed
[INFO] [stdout]   --> src/m1_enums.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | enum Conveyance {
[INFO] [stdout]    |      ---------- variants in this enum
[INFO] [stdout] 25 |     Car = 15,
[INFO] [stdout] 26 |     Train = 20,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 27 |     Air = 30,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Conveyance` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `email` and `active` are never read
[INFO] [stdout]  --> src/m2_structs.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 3 |     username: String,
[INFO] [stdout] 4 |     email: String,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 5 |     sign_in_count: u64,
[INFO] [stdout] 6 |     active: bool,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `User` 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 items `change_email` and `change_username` are never used
[INFO] [stdout]   --> src/m2_structs.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl User {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 21 |     fn change_email(&mut self, new_email: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn change_username(user: &mut User, new_username: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Warrior` and `Wizard` are never constructed
[INFO] [stdout]   --> src/m3_trait.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | enum Character {
[INFO] [stdout]    |      --------- variants in this enum
[INFO] [stdout] 12 |     Warrior,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 13 |     Archer,
[INFO] [stdout] 14 |     Wizard,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Character` 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 `test_lifetime` is never used
[INFO] [stdout]  --> src/m5_lifetimes.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn test_lifetime() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/m5_lifetimes.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn largest<'a, T: PartialOrd>(compare_1: &'a T, compare_2: &'a T) -> &'a T {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]   --> src/m5_lifetimes.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Person<'b> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `allowance` is never used
[INFO] [stdout]  --> src/m9_mods.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn allowance() {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Conveyance` is never used
[INFO] [stdout]  --> src/m9_mods.rs:2:14
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub enum Conveyance {
[INFO] [stdout]   |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/m1_enums.rs:94:9
[INFO] [stdout]    |
[INFO] [stdout] 94 |         dbg!(is_under_five_res_buil_in);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 48 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 6.35s
[INFO] running `Command { std: "docker" "inspect" "aa1c90d2267bd5d958ac20dabab71f08719e0d034002360a33e89fc44b2ede86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa1c90d2267bd5d958ac20dabab71f08719e0d034002360a33e89fc44b2ede86", kill_on_drop: false }`
[INFO] [stdout] aa1c90d2267bd5d958ac20dabab71f08719e0d034002360a33e89fc44b2ede86
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 8aa77f39e1514930fa081c67ac8a0bcdccc0a58d32f965f63022f0daa3a81058
[INFO] running `Command { std: "docker" "start" "-a" "8aa77f39e1514930fa081c67ac8a0bcdccc0a58d32f965f63022f0daa3a81058", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `List::Cons`
[INFO] [stderr]   --> src/m11_custom_smart_pointers.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |     use List::Cons;
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `linked_list` should have an upper camel case name
[INFO] [stderr]  --> src/m12_linked_list.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | struct linked_list {
[INFO] [stderr]   |        ^^^^^^^^^^^ help: convert the identifier to upper camel case: `LinkedList`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `pointer` should have an upper camel case name
[INFO] [stderr]   --> src/m12_linked_list.rs:12:6
[INFO] [stderr]    |
[INFO] [stderr] 12 | type pointer = Option<Box<Node>>;
[INFO] [stderr]    |      ^^^^^^^ help: convert the identifier to upper camel case: `Pointer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition: `input`
[INFO] [stderr]   --> src/m14_macros.rs:25:14
[INFO] [stderr]    |
[INFO] [stderr] 25 | macro_rules! input {
[INFO] [stderr]    |              ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]   --> src/m14_macros.rs:20:38
[INFO] [stderr]    |
[INFO] [stderr] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stderr]    |                                      ^ help: remove this semicolon
[INFO] [stderr] ...
[INFO] [stderr] 72 |         let str_null = string_concat!();
[INFO] [stderr]    |                        ---------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stderr]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]   --> src/m14_macros.rs:20:38
[INFO] [stderr]    |
[INFO] [stderr] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stderr]    |                                      ^ help: remove this semicolon
[INFO] [stderr] ...
[INFO] [stderr] 73 |         let str_single = string_concat!("First");
[INFO] [stderr]    |                          ----------------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]   --> src/m14_macros.rs:20:38
[INFO] [stderr]    |
[INFO] [stderr] 20 |     $(temp_str.push_str($some_str);)*;
[INFO] [stderr]    |                                      ^ help: remove this semicolon
[INFO] [stderr] ...
[INFO] [stderr] 75 |         let str_multiple = string_concat!("Firts","Second");
[INFO] [stderr]    |                            -------------------------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ethers::types::Res`
[INFO] [stderr]   --> src/m7_async.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     use ethers::types::Res;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `stack_ref`
[INFO] [stderr]   --> src/m10_smart_pointers.rs:20:13
[INFO] [stderr]    |
[INFO] [stderr] 20 |         let stack_ref = &stack_var;
[INFO] [stderr]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stack_ref`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `heap_var`
[INFO] [stderr]   --> src/m10_smart_pointers.rs:28:13
[INFO] [stderr]    |
[INFO] [stderr] 28 |         let heap_var = Box::new(stack_var);
[INFO] [stderr]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heap_var`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/m12_reference_counting_pointer.rs:20:13
[INFO] [stderr]    |
[INFO] [stderr] 20 |         let b = Rc::new(Cons(3, Rc::clone(&a)));
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/m12_reference_counting_pointer.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |         let c = Rc::new(Cons(4, Rc::clone(&a)));
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list1`
[INFO] [stderr]   --> src/m13_double_linked_list.rs:59:17
[INFO] [stderr]    |
[INFO] [stderr] 59 |         let mut list1: List<i32> = List::new();
[INFO] [stderr]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_list1`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/m13_double_linked_list.rs:59:13
[INFO] [stderr]    |
[INFO] [stderr] 59 |         let mut list1: List<i32> = List::new();
[INFO] [stderr]    |             ----^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `str_null`
[INFO] [stderr]   --> src/m14_macros.rs:72:13
[INFO] [stderr]    |
[INFO] [stderr] 72 |         let str_null = string_concat!();
[INFO] [stderr]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_null`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `str_single`
[INFO] [stderr]   --> src/m14_macros.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |         let str_single = string_concat!("First");
[INFO] [stderr]    |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_single`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `str_multiple`
[INFO] [stderr]   --> src/m14_macros.rs:75:13
[INFO] [stderr]    |
[INFO] [stderr] 75 |         let str_multiple = string_concat!("Firts","Second");
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_str_multiple`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `some_var`
[INFO] [stderr]   --> src/m14_macros.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 |         let some_var = mad_skills!(i32);
[INFO] [stderr]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_var`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/m14_macros.rs:78:17
[INFO] [stderr]    |
[INFO] [stderr] 78 |         let mut x: Vec<i32>  = vec!();
[INFO] [stderr]    |                 ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/m14_macros.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let mut temp_str = String::new();
[INFO] [stderr]    |             ----^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] ...
[INFO] [stderr] 72 |         let str_null = string_concat!();
[INFO] [stderr]    |                        ---------------- in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in the macro `string_concat` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/m14_macros.rs:78:13
[INFO] [stderr]    |
[INFO] [stderr] 78 |         let mut x: Vec<i32>  = vec!();
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/m14_macros.rs:79:13
[INFO] [stderr]    |
[INFO] [stderr] 79 |         let mut y = my_vec!(1,2,3,4);
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `addr`
[INFO] [stderr]   --> src/m4_polymorphism.rs:35:13
[INFO] [stderr]    |
[INFO] [stderr] 35 |         let addr: Address =
[INFO] [stderr]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_addr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `alice_check`
[INFO] [stderr]   --> src/m5_lifetimes.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |         let alice_check = largest(&check_ag, alice.points);
[INFO] [stderr]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_alice_check`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `prob_none`
[INFO] [stderr]   --> src/m6_patterns.rs:46:13
[INFO] [stderr]    |
[INFO] [stderr] 46 |         let prob_none: Option<i32> = None;
[INFO] [stderr]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_prob_none`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `person1`
[INFO] [stderr]   --> src/m8_collections.rs:12:13
[INFO] [stderr]    |
[INFO] [stderr] 12 |         let person1 = "alice";
[INFO] [stderr]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_person1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `person2`
[INFO] [stderr]   --> src/m8_collections.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |         let person2 = "bob";
[INFO] [stderr]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_person2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `travel_1`
[INFO] [stderr]   --> src/m9_mods.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let travel_1 = travel_history::Conveyance::Car;
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `travel_2`
[INFO] [stderr]   --> src/m9_mods.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let travel_2 = travel_history::Conveyance::Air;
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_travel_2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `area_rect1`
[INFO] [stderr]   --> src/main.rs:99:9
[INFO] [stderr]    |
[INFO] [stderr] 99 |     let area_rect1 = math_funcs::rect_area(&rect1.length, &rect1.width);
[INFO] [stderr]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_area_rect1`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:79:9
[INFO] [stderr]    |
[INFO] [stderr] 79 |     let mut f = min;
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:80:9
[INFO] [stderr]    |
[INFO] [stderr] 80 |     let mut m = max;
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `Cons` is never constructed
[INFO] [stderr]   --> src/m11_custom_smart_pointers.rs:62:5
[INFO] [stderr]    |
[INFO] [stderr] 61 | enum List {
[INFO] [stderr]    |      ---- variant in this enum
[INFO] [stderr] 62 |     Cons(i32, Option<Box<List>>),
[INFO] [stderr]    |     ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `head` and `tail` are never read
[INFO] [stderr]  --> src/m13_double_linked_list.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct List<T> {
[INFO] [stderr]   |        ---- fields in this struct
[INFO] [stderr] 5 |     head: Pointer<T>,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 6 |     tail: Pointer<T>,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `element`, `next`, and `prev` are never read
[INFO] [stderr]   --> src/m13_double_linked_list.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 9  | struct Node<T> {
[INFO] [stderr]    |        ---- fields in this struct
[INFO] [stderr] 10 |     element: T,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 11 |     next: Pointer<T>,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 12 |     prev: Pointer<T>,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]   --> src/m13_double_linked_list.rs:18:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | impl<T: std::fmt::Display> Node<T> {
[INFO] [stderr]    | ---------------------------------- associated function in this implementation
[INFO] [stderr] 18 |     fn new(element: T) -> Rc<RefCell<Node<T>>> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `push_front` is never used
[INFO] [stderr]   --> src/m13_double_linked_list.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 27 | impl<T: std::fmt::Display> List<T> {
[INFO] [stderr]    | ---------------------------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 35 |     fn push_front(&mut self, element: T) {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Green`, `Blue`, and `Silver` are never constructed
[INFO] [stderr]  --> src/m1_enums.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | enum CarColour {
[INFO] [stderr]   |      --------- variants in this enum
[INFO] [stderr] 3 |     Red,
[INFO] [stderr] 4 |     Green,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 5 |     Blue,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 6 |     Silver,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `CarColour` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Train` and `Air` are never constructed
[INFO] [stderr]   --> src/m1_enums.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 24 | enum Conveyance {
[INFO] [stderr]    |      ---------- variants in this enum
[INFO] [stderr] 25 |     Car = 15,
[INFO] [stderr] 26 |     Train = 20,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 27 |     Air = 30,
[INFO] [stderr]    |     ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Conveyance` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: fields `email` and `active` are never read
[INFO] [stderr]  --> src/m2_structs.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | struct User {
[INFO] [stderr]   |        ---- fields in this struct
[INFO] [stderr] 3 |     username: String,
[INFO] [stderr] 4 |     email: String,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 5 |     sign_in_count: u64,
[INFO] [stderr] 6 |     active: bool,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `User` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `change_email` and `change_username` are never used
[INFO] [stderr]   --> src/m2_structs.rs:21:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | impl User {
[INFO] [stderr]    | --------- associated items in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 21 |     fn change_email(&mut self, new_email: &str) {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 25 |     fn change_username(user: &mut User, new_username: &str) {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Warrior` and `Wizard` are never constructed
[INFO] [stderr]   --> src/m3_trait.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | enum Character {
[INFO] [stderr]    |      --------- variants in this enum
[INFO] [stderr] 12 |     Warrior,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 13 |     Archer,
[INFO] [stderr] 14 |     Wizard,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Character` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_lifetime` is never used
[INFO] [stderr]  --> src/m5_lifetimes.rs:2:4
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn test_lifetime() {
[INFO] [stderr]   |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `largest` is never used
[INFO] [stderr]   --> src/m5_lifetimes.rs:26:4
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn largest<'a, T: PartialOrd>(compare_1: &'a T, compare_2: &'a T) -> &'a T {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Person` is never constructed
[INFO] [stderr]   --> src/m5_lifetimes.rs:34:8
[INFO] [stderr]    |
[INFO] [stderr] 34 | struct Person<'b> {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `allowance` is never used
[INFO] [stderr]  --> src/m9_mods.rs:9:8
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub fn allowance() {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Conveyance` is never used
[INFO] [stderr]  --> src/m9_mods.rs:2:14
[INFO] [stderr]   |
[INFO] [stderr] 2 |     pub enum Conveyance {
[INFO] [stderr]   |              ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/m1_enums.rs:94:9
[INFO] [stderr]    |
[INFO] [stderr] 94 |         dbg!(is_under_five_res_buil_in);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: `playground` (bin "playground" test) generated 48 warnings (run `cargo fix --bin "playground" --tests` to apply 26 suggestions)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.31s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/playground-98843e63dd187be6)
[INFO] [stdout] 
[INFO] [stdout] running 16 tests
[INFO] [stdout] test m10_smart_pointers::test::test_smart_pointer ... ok
[INFO] [stdout] test m12_linked_list::test::test_linked_list ... ok
[INFO] [stdout] test m11_custom_smart_pointers::test::test_custom_smart_pointer_2 ... ok
[INFO] [stdout] test m12_reference_counting_pointer::test::test_rc_pointer ... ok
[INFO] [stdout] test m13_double_linked_list::test::test_dbl_list ... ok
[INFO] [stdout] test m14_macros::test::test_macro ... ok
[INFO] [stdout] test m1_enums::test::test_enums ... ok
[INFO] [stdout] test m2_structs::test::tests_struct ... ok
[INFO] [stdout] test m3_trait::test::test_traits ... ok
[INFO] [stdout] test m4_polymorphism::test::test_poly ... ok
[INFO] [stdout] test m6_patterns::test::test_match_literals ... ok
[INFO] [stdout] test m6_patterns::test::test_large_enum ... ok
[INFO] [stdout] test m6_patterns::test::test_match_option ... ok
[INFO] [stdout] test m8_collections::test::tests_hashmap ... ok
[INFO] [stdout] test m8_collections::test::tests_hashset ... ok
[INFO] [stdout] test m7_async::tests::test_calls_async_fn ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- m7_async::tests::test_calls_async_fn stdout ----
[INFO] [stdout] thread 'm7_async::tests::test_calls_async_fn' panicked at src/m7_async.rs:34:17:
[INFO] [stdout] failed to make api request
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x55d82ff2f0f6 - std::backtrace_rs::backtrace::libunwind::trace::h261606ad26a499c1
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
[INFO] [stdout]    1:     0x55d82ff2f0f6 - std::backtrace_rs::backtrace::trace_unsynchronized::hd183f0625477fb28
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stdout]    2:     0x55d82ff2f0f6 - std::sys_common::backtrace::_print_fmt::hd7f8fef21b4eda67
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/sys_common/backtrace.rs:68:5
[INFO] [stdout]    3:     0x55d82ff2f0f6 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h623d9b51f2f453f1
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stdout]    4:     0x55d82ff5c310 - core::fmt::rt::Argument::fmt::h9f417ac76a86f368
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/core/src/fmt/rt.rs:142:9
[INFO] [stdout]    5:     0x55d82ff5c310 - core::fmt::write::hc9b6faf4ac2aeff7
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/core/src/fmt/mod.rs:1120:17
[INFO] [stdout]    6:     0x55d82ff2bf5f - std::io::Write::write_fmt::he04625a3a989fec3
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/io/mod.rs:1810:15
[INFO] [stdout]    7:     0x55d82ff2eed4 - std::sys_common::backtrace::_print::hd5d66399c7df88a2
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stdout]    8:     0x55d82ff2eed4 - std::sys_common::backtrace::print::he81ed2da642d37e5
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stdout]    9:     0x55d82ff30c47 - std::panicking::default_hook::{{closure}}::h85773f4fa117163d
[INFO] [stdout]   10:     0x55d82ff3092d - std::panicking::default_hook::h6a1694a91d09b278
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/panicking.rs:289:9
[INFO] [stdout]   11:     0x55d82f90d9d7 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h616ac37fa3cd6c8f
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/alloc/src/boxed.rs:2029:9
[INFO] [stdout]   12:     0x55d82f90d9d7 - test::test_main::{{closure}}::h00d84697cefdcbb6
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/test/src/lib.rs:138:21
[INFO] [stdout]   13:     0x55d82ff31266 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hcb3fe3b9bb537ba8
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/alloc/src/boxed.rs:2029:9
[INFO] [stdout]   14:     0x55d82ff31266 - std::panicking::rust_panic_with_hook::h0a7ad96e90f7145b
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/panicking.rs:783:13
[INFO] [stdout]   15:     0x55d82ff30f79 - std::panicking::begin_panic_handler::{{closure}}::h7919090525c6485e
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/panicking.rs:649:13
[INFO] [stdout]   16:     0x55d82ff2f5f6 - std::sys_common::backtrace::__rust_end_short_backtrace::hf3289479464f7dfe
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/sys_common/backtrace.rs:171:18
[INFO] [stdout]   17:     0x55d82ff30d10 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/panicking.rs:645:5
[INFO] [stdout]   18:     0x55d82f8c5675 - core::panicking::panic_fmt::hcc9f77c5c132af55
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/core/src/panicking.rs:72:14
[INFO] [stdout]   19:     0x55d82f8d5689 - playground::m7_async::tests::test_calls_async_fn::{{closure}}::h29e81e365346484f
[INFO] [stdout]                                at /opt/rustwide/workdir/src/m7_async.rs:34:17
[INFO] [stdout]   20:     0x55d82f8d2048 - <core::pin::Pin<P> as core::future::future::Future>::poll::h5a18e3b03488727f
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/core/src/future/future.rs:124:9
[INFO] [stdout]   21:     0x55d82f8d209b - <core::pin::Pin<P> as core::future::future::Future>::poll::hcb7c770992265c8b
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/core/src/future/future.rs:124:9
[INFO] [stdout]   22:     0x55d82f8cafe4 - tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}::{{closure}}::h68cd00af2ffe393a
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:665:57
[INFO] [stdout]   23:     0x55d82f8caf1a - tokio::runtime::coop::with_budget::h2e0e6c4eb1179f61
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/coop.rs:107:5
[INFO] [stdout]   24:     0x55d82f8caf1a - tokio::runtime::coop::budget::hb47ef634061967e0
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/coop.rs:73:5
[INFO] [stdout]   25:     0x55d82f8caf1a - tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}::h18f9795ce078eb60
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:665:25
[INFO] [stdout]   26:     0x55d82f8c989c - tokio::runtime::scheduler::current_thread::Context::enter::ha014947a317d5eaf
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:410:19
[INFO] [stdout]   27:     0x55d82f8ca70e - tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::h87f949719d1511d9
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:664:36
[INFO] [stdout]   28:     0x55d82f8ca41b - tokio::runtime::scheduler::current_thread::CoreGuard::enter::{{closure}}::h0386f568fa729c9b
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:743:68
[INFO] [stdout]   29:     0x55d82f8c883b - tokio::runtime::context::scoped::Scoped<T>::set::ha4a4c1a778935ce7
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/context/scoped.rs:40:9
[INFO] [stdout]   30:     0x55d82f8c85e9 - tokio::runtime::context::set_scheduler::{{closure}}::h23ead67b1b1dd56f
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/context.rs:176:26
[INFO] [stdout]   31:     0x55d82f8cef26 - std::thread::local::LocalKey<T>::try_with::h0452b8da9682c883
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/thread/local.rs:270:16
[INFO] [stdout]   32:     0x55d82f8ced0a - std::thread::local::LocalKey<T>::with::h5969dbb3daaa583c
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/thread/local.rs:246:9
[INFO] [stdout]   33:     0x55d82f8c859d - tokio::runtime::context::set_scheduler::h39df2f2fc971e096
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/context.rs:176:9
[INFO] [stdout]   34:     0x55d82f8ca1b0 - tokio::runtime::scheduler::current_thread::CoreGuard::enter::hc85a2352e578f3eb
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:743:27
[INFO] [stdout]   35:     0x55d82f8ca44d - tokio::runtime::scheduler::current_thread::CoreGuard::block_on::h49e794329d1d60e1
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:652:19
[INFO] [stdout]   36:     0x55d82f8c938d - tokio::runtime::scheduler::current_thread::CurrentThread::block_on::{{closure}}::hd1d000d9ffac22df
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:175:28
[INFO] [stdout]   37:     0x55d82f8c8cba - tokio::runtime::context::runtime::enter_runtime::hf7f1cecbc1a78e30
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/context/runtime.rs:65:16
[INFO] [stdout]   38:     0x55d82f8c929e - tokio::runtime::scheduler::current_thread::CurrentThread::block_on::hc5e3deb3a8b4ef8b
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/scheduler/current_thread/mod.rs:167:9
[INFO] [stdout]   39:     0x55d82f8d193d - tokio::runtime::runtime::Runtime::block_on::h4deab42f8f1423aa
[INFO] [stdout]                                at /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.32.0/src/runtime/runtime.rs:347:47
[INFO] [stdout]   40:     0x55d82f8d50c8 - playground::m7_async::tests::test_calls_async_fn::h6176f3b88467fcf2
[INFO] [stdout]                                at /opt/rustwide/workdir/src/m7_async.rs:29:9
[INFO] [stdout]   41:     0x55d82f8d4f57 - playground::m7_async::tests::test_calls_async_fn::{{closure}}::h9f565b6872afe3d5
[INFO] [stdout]                                at /opt/rustwide/workdir/src/m7_async.rs:24:35
[INFO] [stdout]   42:     0x55d82f8d0046 - core::ops::function::FnOnce::call_once::h930065afebf86273
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   43:     0x55d82f9132af - core::ops::function::FnOnce::call_once::hd64d26f405258157
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   44:     0x55d82f9132af - test::__rust_begin_short_backtrace::he21b0b7a6d731bf9
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/test/src/lib.rs:627:18
[INFO] [stdout]   45:     0x55d82f912031 - test::run_test_in_process::{{closure}}::hf5c73986d7bdfde2
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/test/src/lib.rs:650:60
[INFO] [stdout]   46:     0x55d82f912031 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h330011ad032aadc0
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   47:     0x55d82f912031 - std::panicking::try::do_call::he61b0a958b795a41
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/panicking.rs:552:40
[INFO] [stdout]   48:     0x55d82f912031 - std::panicking::try::h7309da130f906eb7
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/panicking.rs:516:19
[INFO] [stdout]   49:     0x55d82f912031 - std::panic::catch_unwind::hc5c3a06fdaf0a92a
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/panic.rs:142:14
[INFO] [stdout]   50:     0x55d82f912031 - test::run_test_in_process::h7e7b7c71c3324e0f
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/test/src/lib.rs:650:27
[INFO] [stdout]   51:     0x55d82f912031 - test::run_test::{{closure}}::h1f509f28f5cf20b1
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/test/src/lib.rs:573:43
[INFO] [stdout]   52:     0x55d82f8d9366 - test::run_test::{{closure}}::h1754218abf443f6d
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/test/src/lib.rs:601:41
[INFO] [stdout]   53:     0x55d82f8d9366 - std::sys_common::backtrace::__rust_begin_short_backtrace::h2ee174b9d5954948
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/sys_common/backtrace.rs:155:18
[INFO] [stdout]   54:     0x55d82f8de3c7 - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::hf60bee9c1a17ef09
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/thread/mod.rs:529:17
[INFO] [stdout]   55:     0x55d82f8de3c7 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h33d0dddec5216160
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/core/src/panic/unwind_safe.rs:272:9
[INFO] [stdout]   56:     0x55d82f8de3c7 - std::panicking::try::do_call::h144b3048b546f835
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/panicking.rs:552:40
[INFO] [stdout]   57:     0x55d82f8de3c7 - std::panicking::try::h978244d04646189f
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/panicking.rs:516:19
[INFO] [stdout]   58:     0x55d82f8de3c7 - std::panic::catch_unwind::hdf436369d188fe86
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/panic.rs:142:14
[INFO] [stdout]   59:     0x55d82f8de3c7 - std::thread::Builder::spawn_unchecked_::{{closure}}::h87329cbdd33c79ec
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/thread/mod.rs:528:30
[INFO] [stdout]   60:     0x55d82f8de3c7 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h401abbe67897d450
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   61:     0x55d82ff35fa5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5d7c8f150ab9c84c
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/alloc/src/boxed.rs:2015:9
[INFO] [stdout]   62:     0x55d82ff35fa5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h570d5b005c242c15
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/alloc/src/boxed.rs:2015:9
[INFO] [stdout]   63:     0x55d82ff35fa5 - std::sys::unix::thread::Thread::new::thread_start::h36b0a20c0b2361ad
[INFO] [stdout]                                at /rustc/0e09125c6c3c2fd70d7de961bcf0e51575235fad/library/std/src/sys/unix/thread.rs:108:17
[INFO] [stdout]   64:     0x7f070ebe6ac3 - <unknown>
[INFO] [stdout]   65:     0x7f070ec77bf4 - __clone
[INFO] [stdout]   66:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     m7_async::tests::test_calls_async_fn
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 15 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.15s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass `--bin playground`
[INFO] running `Command { std: "docker" "inspect" "8aa77f39e1514930fa081c67ac8a0bcdccc0a58d32f965f63022f0daa3a81058", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8aa77f39e1514930fa081c67ac8a0bcdccc0a58d32f965f63022f0daa3a81058", kill_on_drop: false }`
[INFO] [stdout] 8aa77f39e1514930fa081c67ac8a0bcdccc0a58d32f965f63022f0daa3a81058
