[INFO] updating cached repository https://github.com/infynyxx/hello_rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/infynyxx/hello_rust
[INFO] [stderr]    5c4e297..75aca1a  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 75aca1afd04b710b06f68a92050365ff6cd611ea
[INFO] testing infynyxx/hello_rust against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finfynyxx%2Fhello_rust" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/infynyxx/hello_rust on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/infynyxx/hello_rust
[INFO] finished tweaking git repo https://github.com/infynyxx/hello_rust
[INFO] tweaked toml for git repo https://github.com/infynyxx/hello_rust written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/infynyxx/hello_rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stdout] 1b8bb4bd3c647d2430c6808b39d62d1130a9d5564d0d1d60791e85eb42376a5e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "1b8bb4bd3c647d2430c6808b39d62d1130a9d5564d0d1d60791e85eb42376a5e"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libc v0.2.70
[INFO] [stderr]    Compiling proc-macro2 v1.0.17
[INFO] [stderr]    Compiling syn v1.0.23
[INFO] [stderr]    Compiling arc-swap v0.4.6
[INFO] [stderr]    Compiling pin-project-lite v0.1.5
[INFO] [stderr]    Compiling assert_approx_eq v1.1.0
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling net2 v0.2.34
[INFO] [stderr]    Compiling signal-hook-registry v1.2.0
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling mio v0.6.22
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling tempfile v3.1.0
[INFO] [stderr]    Compiling pin-project-internal v0.4.17
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling tokio v0.2.21
[INFO] [stderr]    Compiling pin-project v0.4.17
[INFO] [stderr]    Compiling futures-util v0.3.5
[INFO] [stderr]    Compiling futures-executor v0.3.5
[INFO] [stderr]    Compiling futures v0.3.5
[INFO] [stderr]    Compiling hello_rust v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/error_handling.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/error_handling.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/error_handling.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]  --> src/error_handling.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::Write;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tempfile::tempdir`
[INFO] [stderr]  --> src/error_handling.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use tempfile::tempdir;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/generics.rs:67:5
[INFO] [stderr]    |
[INFO] [stderr] 67 | /     /**
[INFO] [stderr] 68 | |     if (switch) {
[INFO] [stderr] 69 | |         NewsArticle {
[INFO] [stderr] 70 | |             headline: "Hello World".to_string(),
[INFO] [stderr] ...  |
[INFO] [stderr] 81 | |         }
[INFO] [stderr] 82 | |     }**/
[INFO] [stderr]    | |________^
[INFO] [stderr] 83 | /     Tweet {
[INFO] [stderr] 84 | |         username: "infynyxx".to_string(),
[INFO] [stderr] 85 | |         content: "Hello World!".to_string(),
[INFO] [stderr] 86 | |         reply: false,
[INFO] [stderr] 87 | |         retweet: false,
[INFO] [stderr] 88 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]   --> src/generics.rs:58:24
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                        ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `u`
[INFO] [stderr]   --> src/generics.rs:58:30
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                              ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `switch`
[INFO] [stderr]   --> src/generics.rs:66:21
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn get_summarizable(switch: bool) -> impl Summary {
[INFO] [stderr]    |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_switch`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Cacher`
[INFO] [stderr]  --> src/closures.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct Cacher<T>
[INFO] [stderr]   |        ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/closures.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn new(calculation: T) -> Cacher<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `value`
[INFO] [stderr]   --> src/closures.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn value(&mut self, arg: u32) -> u32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout`
[INFO] [stderr]   --> src/closures.rs:35:4
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn generate_workout(intensity: u32, random_number: u32) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V4`
[INFO] [stderr]  --> src/enums.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     V4(u8, u8, u8, u8),
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]  --> src/enums.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     V6(String),
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `call`
[INFO] [stderr]  --> src/enums.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fn call(&self) {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Point`
[INFO] [stderr]  --> src/generics.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 | struct Point<T> {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `distance_from_origin`
[INFO] [stderr]   --> src/generics.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `notify`
[INFO] [stderr]   --> src/generics.rs:54:4
[INFO] [stderr]    |
[INFO] [stderr] 54 | fn notify<T: Summary + Display>(item: T) -> String {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `some_function`
[INFO] [stderr]   --> src/generics.rs:58:4
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_summarizable`
[INFO] [stderr]   --> src/generics.rs:66:4
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn get_summarizable(switch: bool) -> impl Summary {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `largest`
[INFO] [stderr]   --> src/generics.rs:91:4
[INFO] [stderr]    |
[INFO] [stderr] 91 | fn largest<T: PartialOrd + Copy>(list: &[T]) -> T {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/lifetime.rs:25:4
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stderr]   --> src/lifetime.rs:51:8
[INFO] [stderr]    |
[INFO] [stderr] 51 | struct ImportantExcerpt<'a> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `announce_and_return_part`
[INFO] [stderr]   --> src/lifetime.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn announce_and_return_part(&self, s: &str) -> &str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest_with_announcement`
[INFO] [stderr]   --> src/lifetime.rs:62:4
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn longest_with_announcement<'a, T: std::fmt::Display>(x: &'a str, y: &'a str, ann: T) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `area`
[INFO] [stderr]  --> src/structs.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn area(&self) -> u32 {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `can_hold`
[INFO] [stderr]   --> src/structs.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn can_hold(&self, other: Rectangle) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `square`
[INFO] [stderr]   --> src/structs.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     fn square(size: u32) -> Rectangle {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `x`
[INFO] [stderr]   --> src/lib.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     x: f64,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `y`
[INFO] [stderr]   --> src/lib.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     y: f64,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 31 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:46:9
[INFO] [stderr]    |
[INFO] [stderr] 46 |         channel.send(result);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 04s
[INFO] running `"docker" "inspect" "1b8bb4bd3c647d2430c6808b39d62d1130a9d5564d0d1d60791e85eb42376a5e"`
[INFO] running `"docker" "rm" "-f" "1b8bb4bd3c647d2430c6808b39d62d1130a9d5564d0d1d60791e85eb42376a5e"`
[INFO] [stdout] 1b8bb4bd3c647d2430c6808b39d62d1130a9d5564d0d1d60791e85eb42376a5e
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7807a79889b71193419945eaa4fa9b30b39b10ffa9ee56d8f618eb305579d415
[INFO] running `"docker" "start" "-a" "7807a79889b71193419945eaa4fa9b30b39b10ffa9ee56d8f618eb305579d415"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling hello_rust v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/error_handling.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/error_handling.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/error_handling.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]  --> src/error_handling.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::Write;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tempfile::tempdir`
[INFO] [stderr]  --> src/error_handling.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use tempfile::tempdir;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/generics.rs:67:5
[INFO] [stderr]    |
[INFO] [stderr] 67 | /     /**
[INFO] [stderr] 68 | |     if (switch) {
[INFO] [stderr] 69 | |         NewsArticle {
[INFO] [stderr] 70 | |             headline: "Hello World".to_string(),
[INFO] [stderr] ...  |
[INFO] [stderr] 81 | |         }
[INFO] [stderr] 82 | |     }**/
[INFO] [stderr]    | |________^
[INFO] [stderr] 83 | /     Tweet {
[INFO] [stderr] 84 | |         username: "infynyxx".to_string(),
[INFO] [stderr] 85 | |         content: "Hello World!".to_string(),
[INFO] [stderr] 86 | |         reply: false,
[INFO] [stderr] 87 | |         retweet: false,
[INFO] [stderr] 88 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]   --> src/generics.rs:58:24
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                        ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `u`
[INFO] [stderr]   --> src/generics.rs:58:30
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                              ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `switch`
[INFO] [stderr]   --> src/generics.rs:66:21
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn get_summarizable(switch: bool) -> impl Summary {
[INFO] [stderr]    |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_switch`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Cacher`
[INFO] [stderr]  --> src/closures.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct Cacher<T>
[INFO] [stderr]   |        ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/closures.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn new(calculation: T) -> Cacher<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `value`
[INFO] [stderr]   --> src/closures.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn value(&mut self, arg: u32) -> u32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout`
[INFO] [stderr]   --> src/closures.rs:35:4
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn generate_workout(intensity: u32, random_number: u32) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V4`
[INFO] [stderr]  --> src/enums.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     V4(u8, u8, u8, u8),
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]  --> src/enums.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     V6(String),
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `call`
[INFO] [stderr]  --> src/enums.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fn call(&self) {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Point`
[INFO] [stderr]  --> src/generics.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 | struct Point<T> {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `distance_from_origin`
[INFO] [stderr]   --> src/generics.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `notify`
[INFO] [stderr]   --> src/generics.rs:54:4
[INFO] [stderr]    |
[INFO] [stderr] 54 | fn notify<T: Summary + Display>(item: T) -> String {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `some_function`
[INFO] [stderr]   --> src/generics.rs:58:4
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_summarizable`
[INFO] [stderr]   --> src/generics.rs:66:4
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn get_summarizable(switch: bool) -> impl Summary {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `largest`
[INFO] [stderr]   --> src/generics.rs:91:4
[INFO] [stderr]    |
[INFO] [stderr] 91 | fn largest<T: PartialOrd + Copy>(list: &[T]) -> T {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/lifetime.rs:25:4
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stderr]   --> src/lifetime.rs:51:8
[INFO] [stderr]    |
[INFO] [stderr] 51 | struct ImportantExcerpt<'a> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `announce_and_return_part`
[INFO] [stderr]   --> src/lifetime.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn announce_and_return_part(&self, s: &str) -> &str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest_with_announcement`
[INFO] [stderr]   --> src/lifetime.rs:62:4
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn longest_with_announcement<'a, T: std::fmt::Display>(x: &'a str, y: &'a str, ann: T) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `area`
[INFO] [stderr]  --> src/structs.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn area(&self) -> u32 {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `can_hold`
[INFO] [stderr]   --> src/structs.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn can_hold(&self, other: Rectangle) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `square`
[INFO] [stderr]   --> src/structs.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     fn square(size: u32) -> Rectangle {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `x`
[INFO] [stderr]   --> src/lib.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     x: f64,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `y`
[INFO] [stderr]   --> src/lib.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     y: f64,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 31 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:46:9
[INFO] [stderr]    |
[INFO] [stderr] 46 |         channel.send(result);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/generics.rs:67:5
[INFO] [stderr]    |
[INFO] [stderr] 67 | /     /**
[INFO] [stderr] 68 | |     if (switch) {
[INFO] [stderr] 69 | |         NewsArticle {
[INFO] [stderr] 70 | |             headline: "Hello World".to_string(),
[INFO] [stderr] ...  |
[INFO] [stderr] 81 | |         }
[INFO] [stderr] 82 | |     }**/
[INFO] [stderr]    | |________^
[INFO] [stderr] 83 | /     Tweet {
[INFO] [stderr] 84 | |         username: "infynyxx".to_string(),
[INFO] [stderr] 85 | |         content: "Hello World!".to_string(),
[INFO] [stderr] 86 | |         reply: false,
[INFO] [stderr] 87 | |         retweet: false,
[INFO] [stderr] 88 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]   --> src/generics.rs:58:24
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                        ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `u`
[INFO] [stderr]   --> src/generics.rs:58:30
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                              ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `switch`
[INFO] [stderr]   --> src/generics.rs:66:21
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn get_summarizable(switch: bool) -> impl Summary {
[INFO] [stderr]    |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_switch`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Cacher`
[INFO] [stderr]  --> src/closures.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct Cacher<T>
[INFO] [stderr]   |        ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/closures.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn new(calculation: T) -> Cacher<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `value`
[INFO] [stderr]   --> src/closures.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn value(&mut self, arg: u32) -> u32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout`
[INFO] [stderr]   --> src/closures.rs:35:4
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn generate_workout(intensity: u32, random_number: u32) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `call`
[INFO] [stderr]  --> src/enums.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fn call(&self) {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `some_function`
[INFO] [stderr]   --> src/generics.rs:58:4
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_summarizable`
[INFO] [stderr]   --> src/generics.rs:66:4
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn get_summarizable(switch: bool) -> impl Summary {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stderr]   --> src/lifetime.rs:51:8
[INFO] [stderr]    |
[INFO] [stderr] 51 | struct ImportantExcerpt<'a> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `announce_and_return_part`
[INFO] [stderr]   --> src/lifetime.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn announce_and_return_part(&self, s: &str) -> &str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `x`
[INFO] [stderr]   --> src/lib.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     x: f64,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `y`
[INFO] [stderr]   --> src/lib.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     y: f64,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_V4` should have a snake case name
[INFO] [stderr]   --> src/enums.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn test_V4() {
[INFO] [stderr]    |    ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `test_v4`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_V6` should have a snake case name
[INFO] [stderr]   --> src/enums.rs:24:4
[INFO] [stderr]    |
[INFO] [stderr] 24 | fn test_V6() {
[INFO] [stderr]    |    ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `test_v6`
[INFO] [stderr] 
[INFO] [stderr] warning: 17 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.62s
[INFO] running `"docker" "inspect" "7807a79889b71193419945eaa4fa9b30b39b10ffa9ee56d8f618eb305579d415"`
[INFO] running `"docker" "rm" "-f" "7807a79889b71193419945eaa4fa9b30b39b10ffa9ee56d8f618eb305579d415"`
[INFO] [stdout] 7807a79889b71193419945eaa4fa9b30b39b10ffa9ee56d8f618eb305579d415
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 89f4b6fce101f3ee39691a487990cd220d0e6f3e4b2d055bded7f1153843e94c
[INFO] running `"docker" "start" "-a" "89f4b6fce101f3ee39691a487990cd220d0e6f3e4b2d055bded7f1153843e94c"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/error_handling.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/error_handling.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/error_handling.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]  --> src/error_handling.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::Write;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tempfile::tempdir`
[INFO] [stderr]  --> src/error_handling.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use tempfile::tempdir;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/generics.rs:67:5
[INFO] [stderr]    |
[INFO] [stderr] 67 | /     /**
[INFO] [stderr] 68 | |     if (switch) {
[INFO] [stderr] 69 | |         NewsArticle {
[INFO] [stderr] 70 | |             headline: "Hello World".to_string(),
[INFO] [stderr] ...  |
[INFO] [stderr] 81 | |         }
[INFO] [stderr] 82 | |     }**/
[INFO] [stderr]    | |________^
[INFO] [stderr] 83 | /     Tweet {
[INFO] [stderr] 84 | |         username: "infynyxx".to_string(),
[INFO] [stderr] 85 | |         content: "Hello World!".to_string(),
[INFO] [stderr] 86 | |         reply: false,
[INFO] [stderr] 87 | |         retweet: false,
[INFO] [stderr] 88 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]   --> src/generics.rs:58:24
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                        ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `u`
[INFO] [stderr]   --> src/generics.rs:58:30
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                              ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `switch`
[INFO] [stderr]   --> src/generics.rs:66:21
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn get_summarizable(switch: bool) -> impl Summary {
[INFO] [stderr]    |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_switch`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Cacher`
[INFO] [stderr]  --> src/closures.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct Cacher<T>
[INFO] [stderr]   |        ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/closures.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn new(calculation: T) -> Cacher<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `value`
[INFO] [stderr]   --> src/closures.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn value(&mut self, arg: u32) -> u32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout`
[INFO] [stderr]   --> src/closures.rs:35:4
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn generate_workout(intensity: u32, random_number: u32) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V4`
[INFO] [stderr]  --> src/enums.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     V4(u8, u8, u8, u8),
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]  --> src/enums.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     V6(String),
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `call`
[INFO] [stderr]  --> src/enums.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fn call(&self) {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Point`
[INFO] [stderr]  --> src/generics.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 | struct Point<T> {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `distance_from_origin`
[INFO] [stderr]   --> src/generics.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `notify`
[INFO] [stderr]   --> src/generics.rs:54:4
[INFO] [stderr]    |
[INFO] [stderr] 54 | fn notify<T: Summary + Display>(item: T) -> String {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `some_function`
[INFO] [stderr]   --> src/generics.rs:58:4
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_summarizable`
[INFO] [stderr]   --> src/generics.rs:66:4
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn get_summarizable(switch: bool) -> impl Summary {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `largest`
[INFO] [stderr]   --> src/generics.rs:91:4
[INFO] [stderr]    |
[INFO] [stderr] 91 | fn largest<T: PartialOrd + Copy>(list: &[T]) -> T {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest`
[INFO] [stderr]   --> src/lifetime.rs:25:4
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stderr]   --> src/lifetime.rs:51:8
[INFO] [stderr]    |
[INFO] [stderr] 51 | struct ImportantExcerpt<'a> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `announce_and_return_part`
[INFO] [stderr]   --> src/lifetime.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn announce_and_return_part(&self, s: &str) -> &str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest_with_announcement`
[INFO] [stderr]   --> src/lifetime.rs:62:4
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn longest_with_announcement<'a, T: std::fmt::Display>(x: &'a str, y: &'a str, ann: T) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `area`
[INFO] [stderr]  --> src/structs.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn area(&self) -> u32 {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `can_hold`
[INFO] [stderr]   --> src/structs.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn can_hold(&self, other: Rectangle) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `square`
[INFO] [stderr]   --> src/structs.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     fn square(size: u32) -> Rectangle {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `x`
[INFO] [stderr]   --> src/lib.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     x: f64,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `y`
[INFO] [stderr]   --> src/lib.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     y: f64,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 31 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:46:9
[INFO] [stderr]    |
[INFO] [stderr] 46 |         channel.send(result);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/generics.rs:67:5
[INFO] [stderr]    |
[INFO] [stderr] 67 | /     /**
[INFO] [stderr] 68 | |     if (switch) {
[INFO] [stderr] 69 | |         NewsArticle {
[INFO] [stderr] 70 | |             headline: "Hello World".to_string(),
[INFO] [stderr] ...  |
[INFO] [stderr] 81 | |         }
[INFO] [stderr] 82 | |     }**/
[INFO] [stderr]    | |________^
[INFO] [stderr] 83 | /     Tweet {
[INFO] [stderr] 84 | |         username: "infynyxx".to_string(),
[INFO] [stderr] 85 | |         content: "Hello World!".to_string(),
[INFO] [stderr] 86 | |         reply: false,
[INFO] [stderr] 87 | |         retweet: false,
[INFO] [stderr] 88 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]   --> src/generics.rs:58:24
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                        ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `u`
[INFO] [stderr]   --> src/generics.rs:58:30
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                              ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `switch`
[INFO] [stderr]   --> src/generics.rs:66:21
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn get_summarizable(switch: bool) -> impl Summary {
[INFO] [stderr]    |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_switch`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Cacher`
[INFO] [stderr]  --> src/closures.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct Cacher<T>
[INFO] [stderr]   |        ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/closures.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn new(calculation: T) -> Cacher<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `value`
[INFO] [stderr]   --> src/closures.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn value(&mut self, arg: u32) -> u32 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate_workout`
[INFO] [stderr]   --> src/closures.rs:35:4
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn generate_workout(intensity: u32, random_number: u32) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `call`
[INFO] [stderr]  --> src/enums.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     fn call(&self) {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `some_function`
[INFO] [stderr]   --> src/generics.rs:58:4
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn some_function<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_summarizable`
[INFO] [stderr]   --> src/generics.rs:66:4
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn get_summarizable(switch: bool) -> impl Summary {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stderr]   --> src/lifetime.rs:51:8
[INFO] [stderr]    |
[INFO] [stderr] 51 | struct ImportantExcerpt<'a> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `announce_and_return_part`
[INFO] [stderr]   --> src/lifetime.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn announce_and_return_part(&self, s: &str) -> &str {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `x`
[INFO] [stderr]   --> src/lib.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     x: f64,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `y`
[INFO] [stderr]   --> src/lib.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     y: f64,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_V4` should have a snake case name
[INFO] [stderr]   --> src/enums.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn test_V4() {
[INFO] [stderr]    |    ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `test_v4`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_V6` should have a snake case name
[INFO] [stderr]   --> src/enums.rs:24:4
[INFO] [stderr]    |
[INFO] [stderr] 24 | fn test_V6() {
[INFO] [stderr]    |    ^^^^^^^ help: convert the identifier to snake case (notice the capitalization): `test_v6`
[INFO] [stderr] 
[INFO] [stderr] warning: 17 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.30s
[INFO] [stdout] 
[INFO] [stdout] running 19 tests
[INFO] [stdout] test enums::test_V6 ... ok
[INFO] [stdout] test generics::test_largest ... ok
[INFO] [stdout] test error_handling::test_read_from_file_non_existent ... ok
[INFO] [stdout] test generics::test_notify ... ok
[INFO] [stdout] test lifetime::tests::test_longest_with ... ok
[INFO] [stdout] test slice::test_slices ... ok
[INFO] [stdout] test structs::tests::test_area ... ok
[INFO] [stdout] test structs::tests::test_can_hold_false ... ok
[INFO] [stdout] test structs::tests::test_can_hold_true ... ok
[INFO] [stdout] test structs::tests::test_square ... ok
[INFO] [stdout] test test::test_add_one ... ok
[INFO] [stdout] test test::test_add_three ... ok
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/hello_rust-195945023768c978
[INFO] [stdout] test enums::test_V4 ... ok
[INFO] [stdout] test lifetime::tests::test_longest ... ok
[INFO] [stdout] test generics::test_distance_from_origin ... ok
[INFO] [stdout] test slice::test_first_word_with_space ... ok
[INFO] [stdout] test slice::test_first_word_without_space ... ok
[INFO] [stdout] test error_handling::test_read_from_file ... ok
[INFO] [stdout] test test::test_times_four ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 19 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/hello_rust-791a618041cd5b27
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/lib-d69993d0bd8983a1
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test math_checks_out ... ok
[INFO] [stdout] test test_circle_area ... ok
[INFO] [stderr]    Doc-tests hello_rust
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "89f4b6fce101f3ee39691a487990cd220d0e6f3e4b2d055bded7f1153843e94c"`
[INFO] running `"docker" "rm" "-f" "89f4b6fce101f3ee39691a487990cd220d0e6f3e4b2d055bded7f1153843e94c"`
[INFO] [stdout] 89f4b6fce101f3ee39691a487990cd220d0e6f3e4b2d055bded7f1153843e94c