[INFO] cloning repository https://github.com/jheloper/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jheloper/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjheloper%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjheloper%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 491b964c424a527ce070fbe760b201e4514f7d2d
[INFO] building jheloper/rust-playground against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjheloper%2Frust-playground" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jheloper/rust-playground on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jheloper/rust-playground
[INFO] finished tweaking git repo https://github.com/jheloper/rust-playground
[INFO] tweaked toml for git repo https://github.com/jheloper/rust-playground written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/jheloper/rust-playground 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c8a0dd3c181e69c473225caad0b2fde8a0fe0d10bea8e17fe425b1693a74f1d1
[INFO] running `Command { std: "docker" "start" "-a" "c8a0dd3c181e69c473225caad0b2fde8a0fe0d10bea8e17fe425b1693a74f1d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c8a0dd3c181e69c473225caad0b2fde8a0fe0d10bea8e17fe425b1693a74f1d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8a0dd3c181e69c473225caad0b2fde8a0fe0d10bea8e17fe425b1693a74f1d1", kill_on_drop: false }`
[INFO] [stdout] c8a0dd3c181e69c473225caad0b2fde8a0fe0d10bea8e17fe425b1693a74f1d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=forbid -Dtail-expr-drop-order" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e366432ac5674d540b1b0c304f2cea0a0484c78583b1bc876b59d5a103d355e4
[INFO] running `Command { std: "docker" "start" "-a" "e366432ac5674d540b1b0c304f2cea0a0484c78583b1bc876b59d5a103d355e4", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/function_example.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let x = 10;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reference_to_nothing`
[INFO] [stdout]   --> src/reference_example.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let reference_to_nothing = no_dangle();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference_to_nothing`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/reference_example.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let mut s6 = String::from("hello");
[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: `some_string`
[INFO] [stdout]   --> src/reference_example.rs:53:11
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn change(some_string: &String) {
[INFO] [stdout]    |           ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `vector1`
[INFO] [stdout]  --> src/collection_example.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let vector1: Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_vector1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string1`
[INFO] [stdout]   --> src/collection_example.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let mut string1 = String::new();
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/collection_example.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut vector4 = vec![1, 2, 3, 4, 5];
[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/collection_example.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let mut string1 = String::new();
[INFO] [stdout]    |         ----^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_example.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let f = match f {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `guess1`
[INFO] [stdout]   --> src/error_example.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let guess1 = Guess::new(101);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_guess1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_variable_and_mutability` is never used
[INFO] [stdout]  --> src/variable_and_mutability_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_variable_and_mutability() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_data_type` is never used
[INFO] [stdout]  --> src/data_type_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_data_type() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_function` is never used
[INFO] [stdout]  --> src/function_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_function() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `another_function` is never used
[INFO] [stdout]  --> src/function_example.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn another_function(x: i32, y: i32) {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `block_expression` is never used
[INFO] [stdout]   --> src/function_example.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn block_expression() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_ten` is never used
[INFO] [stdout]   --> src/function_example.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn return_ten() -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_control_flow` is never used
[INFO] [stdout]  --> src/control_flow_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_control_flow() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_module` is never used
[INFO] [stdout]  --> src/module_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_module() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_ownership` is never used
[INFO] [stdout]  --> src/ownership_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_ownership() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/ownership_example.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn takes_ownership(some_string: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/ownership_example.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn makes_copy(some_integer: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gives_ownership` is never used
[INFO] [stdout]   --> src/ownership_example.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn gives_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_and_gives_back` is never used
[INFO] [stdout]   --> src/ownership_example.rs:60:4
[INFO] [stdout]    |
[INFO] [stdout] 60 | fn takes_and_gives_back(a_string: String) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_reference` is never used
[INFO] [stdout]  --> src/reference_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_reference() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/reference_example.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn calculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]   --> src/reference_example.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn change(some_string: &String) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change_mutable` is never used
[INFO] [stdout]   --> src/reference_example.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn change_mutable(some_string: &mut String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_dangle` is never used
[INFO] [stdout]   --> src/reference_example.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn no_dangle() -> String {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_slices` is never used
[INFO] [stdout]  --> src/slice_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_slices() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/slice_example.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn first_word(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word_slices` is never used
[INFO] [stdout]   --> src/slice_example.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn first_word_slices(s: &str) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `second_word_slices` is never used
[INFO] [stdout]   --> src/slice_example.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn second_word_slices(s: &str) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/struct_example.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_struct` is never used
[INFO] [stdout]  --> src/struct_example.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn example_struct() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/struct_example.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]   --> src/struct_example.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 | struct Color(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/struct_example.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | struct Point(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_tuple_struct` is never used
[INFO] [stdout]   --> src/struct_example.rs:57:4
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn example_tuple_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_struct_rectangles` is never used
[INFO] [stdout]  --> src/struct_rectangles_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_struct_rectangles() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_area` is never used
[INFO] [stdout]   --> src/struct_rectangles_example.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn calculate_area(length: u32, width: u32) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_area_by_tuple` is never used
[INFO] [stdout]   --> src/struct_rectangles_example.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn calculate_area_by_tuple(dimensions: (u32, u32)) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/struct_rectangles_example.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | struct Rectangle {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_area_by_struct` is never used
[INFO] [stdout]   --> src/struct_rectangles_example.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn calculate_area_by_struct(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/method_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `calculate_area`, `can_hold`, and `square` are never used
[INFO] [stdout]   --> src/method_example.rs:7:8
[INFO] [stdout]    |
[INFO] [stdout] 6  | impl Rectangle {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 7  |     fn calculate_area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 11 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_method` is never used
[INFO] [stdout]   --> src/method_example.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn example_method() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_enums` is never used
[INFO] [stdout]  --> src/enums_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_enums() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind` is never used
[INFO] [stdout]   --> src/enums_example.rs:56:6
[INFO] [stdout]    |
[INFO] [stdout] 56 | enum IpAddrKind {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddr` is never constructed
[INFO] [stdout]   --> src/enums_example.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | struct IpAddr {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrEnum` is never used
[INFO] [stdout]   --> src/enums_example.rs:68:6
[INFO] [stdout]    |
[INFO] [stdout] 68 | enum IpAddrEnum {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/enums_example.rs:74:6
[INFO] [stdout]    |
[INFO] [stdout] 74 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/enums_example.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 81 | impl Message {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 82 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_match` is never used
[INFO] [stdout]  --> src/match_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_match() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]   --> src/match_example.rs:49:6
[INFO] [stdout]    |
[INFO] [stdout] 49 | enum UsState {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> src/match_example.rs:56:6
[INFO] [stdout]    |
[INFO] [stdout] 56 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `value_in_cents` is never used
[INFO] [stdout]   --> src/match_example.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn value_in_cents(coin: Coin) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_one` is never used
[INFO] [stdout]   --> src/match_example.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_collection` is never used
[INFO] [stdout]  --> src/collection_example.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn example_collection() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SpreadsheetCell` is never used
[INFO] [stdout]    --> src/collection_example.rs:168:6
[INFO] [stdout]     |
[INFO] [stdout] 168 | enum SpreadsheetCell {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_error` is never used
[INFO] [stdout]  --> src/error_example.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn example_error() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]   --> src/error_example.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file2` is never used
[INFO] [stdout]   --> src/error_example.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn read_username_from_file2() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Guess` is never constructed
[INFO] [stdout]   --> src/error_example.rs:76:12
[INFO] [stdout]    |
[INFO] [stdout] 76 | pub struct Guess {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/error_example.rs:81:12
[INFO] [stdout]    |
[INFO] [stdout] 80 | impl Guess {
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 81 |     pub fn new(value: u32) -> Guess {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 89 |     pub fn value(&self) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_generic` is never used
[INFO] [stdout]  --> src/generic_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_generic() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/generic_example.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn largest(list: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_i32` is never used
[INFO] [stdout]   --> src/generic_example.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn largest_i32(list: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_char` is never used
[INFO] [stdout]   --> src/generic_example.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn largest_char(list: &[char]) -> char {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/generic_example.rs:81:8
[INFO] [stdout]    |
[INFO] [stdout] 81 | struct Point<T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `x` is never used
[INFO] [stdout]   --> src/generic_example.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 86 | impl<T> Point<T> {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] 87 |     fn x(&self) -> &T {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point2` is never constructed
[INFO] [stdout]   --> src/generic_example.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Point2<T, U> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mixup` is never used
[INFO] [stdout]   --> src/generic_example.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 98 | impl<T, U> Point2<T, U> {
[INFO] [stdout]    | ----------------------- method in this implementation
[INFO] [stdout] 99 |     fn mixup<V, W>(self, other: Point2<V, W>) -> Point2<T, W> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `headline` and `location` are never read
[INFO] [stdout]   --> src/trait_example.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct NewsArticle {
[INFO] [stdout]    |        ----------- fields in this struct
[INFO] [stdout] 58 |     pub headline: String,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 59 |     pub location: String,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `content`, `reply`, and `retweet` are never read
[INFO] [stdout]   --> src/trait_example.rs:72:9
[INFO] [stdout]    |
[INFO] [stdout] 70 | struct Tweet {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 71 |     pub username: String,
[INFO] [stdout] 72 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 73 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 74 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/trait_example.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 83 | struct Feed {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 84 |     pub username: String,
[INFO] [stdout] 85 |     pub content: String
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.28s
[INFO] running `Command { std: "docker" "inspect" "e366432ac5674d540b1b0c304f2cea0a0484c78583b1bc876b59d5a103d355e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e366432ac5674d540b1b0c304f2cea0a0484c78583b1bc876b59d5a103d355e4", kill_on_drop: false }`
[INFO] [stdout] e366432ac5674d540b1b0c304f2cea0a0484c78583b1bc876b59d5a103d355e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=forbid -Dtail-expr-drop-order" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c80d7d56d563176a13e199d8f202d5d7080f2e7098beb1a31a39e1155b5af141
[INFO] running `Command { std: "docker" "start" "-a" "c80d7d56d563176a13e199d8f202d5d7080f2e7098beb1a31a39e1155b5af141", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/function_example.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let x = 10;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reference_to_nothing`
[INFO] [stdout]   --> src/reference_example.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let reference_to_nothing = no_dangle();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference_to_nothing`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/reference_example.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let mut s6 = String::from("hello");
[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: `some_string`
[INFO] [stdout]   --> src/reference_example.rs:53:11
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn change(some_string: &String) {
[INFO] [stdout]    |           ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `vector1`
[INFO] [stdout]  --> src/collection_example.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let vector1: Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_vector1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string1`
[INFO] [stdout]   --> src/collection_example.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let mut string1 = String::new();
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/collection_example.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut vector4 = vec![1, 2, 3, 4, 5];
[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/collection_example.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let mut string1 = String::new();
[INFO] [stdout]    |         ----^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_example.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let f = match f {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `guess1`
[INFO] [stdout]   --> src/error_example.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let guess1 = Guess::new(101);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_guess1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_variable_and_mutability` is never used
[INFO] [stdout]  --> src/variable_and_mutability_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_variable_and_mutability() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_data_type` is never used
[INFO] [stdout]  --> src/data_type_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_data_type() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_function` is never used
[INFO] [stdout]  --> src/function_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_function() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `another_function` is never used
[INFO] [stdout]  --> src/function_example.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn another_function(x: i32, y: i32) {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `block_expression` is never used
[INFO] [stdout]   --> src/function_example.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn block_expression() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `return_ten` is never used
[INFO] [stdout]   --> src/function_example.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn return_ten() -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_control_flow` is never used
[INFO] [stdout]  --> src/control_flow_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_control_flow() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_module` is never used
[INFO] [stdout]  --> src/module_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_module() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_ownership` is never used
[INFO] [stdout]  --> src/ownership_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_ownership() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_ownership` is never used
[INFO] [stdout]   --> src/ownership_example.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn takes_ownership(some_string: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `makes_copy` is never used
[INFO] [stdout]   --> src/ownership_example.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn makes_copy(some_integer: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `gives_ownership` is never used
[INFO] [stdout]   --> src/ownership_example.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn gives_ownership() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `takes_and_gives_back` is never used
[INFO] [stdout]   --> src/ownership_example.rs:60:4
[INFO] [stdout]    |
[INFO] [stdout] 60 | fn takes_and_gives_back(a_string: String) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_reference` is never used
[INFO] [stdout]  --> src/reference_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_reference() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_length` is never used
[INFO] [stdout]   --> src/reference_example.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn calculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]   --> src/reference_example.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn change(some_string: &String) {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change_mutable` is never used
[INFO] [stdout]   --> src/reference_example.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn change_mutable(some_string: &mut String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `no_dangle` is never used
[INFO] [stdout]   --> src/reference_example.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn no_dangle() -> String {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_slices` is never used
[INFO] [stdout]  --> src/slice_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_slices() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/slice_example.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn first_word(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word_slices` is never used
[INFO] [stdout]   --> src/slice_example.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn first_word_slices(s: &str) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `second_word_slices` is never used
[INFO] [stdout]   --> src/slice_example.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn second_word_slices(s: &str) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/struct_example.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_struct` is never used
[INFO] [stdout]  --> src/struct_example.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn example_struct() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_user` is never used
[INFO] [stdout]   --> src/struct_example.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn build_user(email: String, username: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]   --> src/struct_example.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 | struct Color(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/struct_example.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | struct Point(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_tuple_struct` is never used
[INFO] [stdout]   --> src/struct_example.rs:57:4
[INFO] [stdout]    |
[INFO] [stdout] 57 | fn example_tuple_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_struct_rectangles` is never used
[INFO] [stdout]  --> src/struct_rectangles_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_struct_rectangles() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_area` is never used
[INFO] [stdout]   --> src/struct_rectangles_example.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn calculate_area(length: u32, width: u32) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_area_by_tuple` is never used
[INFO] [stdout]   --> src/struct_rectangles_example.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn calculate_area_by_tuple(dimensions: (u32, u32)) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]   --> src/struct_rectangles_example.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 | struct Rectangle {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_area_by_struct` is never used
[INFO] [stdout]   --> src/struct_rectangles_example.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn calculate_area_by_struct(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Rectangle` is never constructed
[INFO] [stdout]  --> src/method_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Rectangle {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `calculate_area`, `can_hold`, and `square` are never used
[INFO] [stdout]   --> src/method_example.rs:7:8
[INFO] [stdout]    |
[INFO] [stdout] 6  | impl Rectangle {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 7  |     fn calculate_area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 11 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_method` is never used
[INFO] [stdout]   --> src/method_example.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn example_method() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_enums` is never used
[INFO] [stdout]  --> src/enums_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_enums() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrKind` is never used
[INFO] [stdout]   --> src/enums_example.rs:56:6
[INFO] [stdout]    |
[INFO] [stdout] 56 | enum IpAddrKind {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpAddr` is never constructed
[INFO] [stdout]   --> src/enums_example.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | struct IpAddr {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IpAddrEnum` is never used
[INFO] [stdout]   --> src/enums_example.rs:68:6
[INFO] [stdout]    |
[INFO] [stdout] 68 | enum IpAddrEnum {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Message` is never used
[INFO] [stdout]   --> src/enums_example.rs:74:6
[INFO] [stdout]    |
[INFO] [stdout] 74 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `call` is never used
[INFO] [stdout]   --> src/enums_example.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 81 | impl Message {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 82 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_match` is never used
[INFO] [stdout]  --> src/match_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_match() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `UsState` is never used
[INFO] [stdout]   --> src/match_example.rs:49:6
[INFO] [stdout]    |
[INFO] [stdout] 49 | enum UsState {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Coin` is never used
[INFO] [stdout]   --> src/match_example.rs:56:6
[INFO] [stdout]    |
[INFO] [stdout] 56 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `value_in_cents` is never used
[INFO] [stdout]   --> src/match_example.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn value_in_cents(coin: Coin) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_one` is never used
[INFO] [stdout]   --> src/match_example.rs:78:4
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_collection` is never used
[INFO] [stdout]  --> src/collection_example.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn example_collection() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SpreadsheetCell` is never used
[INFO] [stdout]    --> src/collection_example.rs:168:6
[INFO] [stdout]     |
[INFO] [stdout] 168 | enum SpreadsheetCell {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_error` is never used
[INFO] [stdout]  --> src/error_example.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn example_error() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]   --> src/error_example.rs:48:4
[INFO] [stdout]    |
[INFO] [stdout] 48 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file2` is never used
[INFO] [stdout]   --> src/error_example.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn read_username_from_file2() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Guess` is never constructed
[INFO] [stdout]   --> src/error_example.rs:76:12
[INFO] [stdout]    |
[INFO] [stdout] 76 | pub struct Guess {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/error_example.rs:81:12
[INFO] [stdout]    |
[INFO] [stdout] 80 | impl Guess {
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 81 |     pub fn new(value: u32) -> Guess {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 89 |     pub fn value(&self) -> u32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `example_generic` is never used
[INFO] [stdout]  --> src/generic_example.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn example_generic() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest` is never used
[INFO] [stdout]   --> src/generic_example.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn largest(list: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_i32` is never used
[INFO] [stdout]   --> src/generic_example.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn largest_i32(list: &[i32]) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `largest_char` is never used
[INFO] [stdout]   --> src/generic_example.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn largest_char(list: &[char]) -> char {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/generic_example.rs:81:8
[INFO] [stdout]    |
[INFO] [stdout] 81 | struct Point<T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `x` is never used
[INFO] [stdout]   --> src/generic_example.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 86 | impl<T> Point<T> {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] 87 |     fn x(&self) -> &T {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point2` is never constructed
[INFO] [stdout]   --> src/generic_example.rs:93:8
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct Point2<T, U> {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mixup` is never used
[INFO] [stdout]   --> src/generic_example.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 98 | impl<T, U> Point2<T, U> {
[INFO] [stdout]    | ----------------------- method in this implementation
[INFO] [stdout] 99 |     fn mixup<V, W>(self, other: Point2<V, W>) -> Point2<T, W> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `headline` and `location` are never read
[INFO] [stdout]   --> src/trait_example.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct NewsArticle {
[INFO] [stdout]    |        ----------- fields in this struct
[INFO] [stdout] 58 |     pub headline: String,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 59 |     pub location: String,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `content`, `reply`, and `retweet` are never read
[INFO] [stdout]   --> src/trait_example.rs:72:9
[INFO] [stdout]    |
[INFO] [stdout] 70 | struct Tweet {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 71 |     pub username: String,
[INFO] [stdout] 72 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 73 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 74 |     pub retweet: bool,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `content` is never read
[INFO] [stdout]   --> src/trait_example.rs:85:9
[INFO] [stdout]    |
[INFO] [stdout] 83 | struct Feed {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] 84 |     pub username: String,
[INFO] [stdout] 85 |     pub content: String
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.28s
[INFO] running `Command { std: "docker" "inspect" "c80d7d56d563176a13e199d8f202d5d7080f2e7098beb1a31a39e1155b5af141", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c80d7d56d563176a13e199d8f202d5d7080f2e7098beb1a31a39e1155b5af141", kill_on_drop: false }`
[INFO] [stdout] c80d7d56d563176a13e199d8f202d5d7080f2e7098beb1a31a39e1155b5af141