[INFO] updating cached repository https://github.com/Delorus/rust_learning
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 85e9ac89dac5dca12156acf98619a6a7add91951
[INFO] testing Delorus/rust_learning against 1.45.2 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Delorus/rust_learning on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Delorus/rust_learning
[INFO] finished tweaking git repo https://github.com/Delorus/rust_learning
[INFO] tweaked toml for git repo https://github.com/Delorus/rust_learning written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/Delorus/rust_learning already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c79ef82fab2cf9c7a77db96062bf5d0329460293dea7dcaad8abde3f1117c589
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c79ef82fab2cf9c7a77db96062bf5d0329460293dea7dcaad8abde3f1117c589", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c79ef82fab2cf9c7a77db96062bf5d0329460293dea7dcaad8abde3f1117c589", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c79ef82fab2cf9c7a77db96062bf5d0329460293dea7dcaad8abde3f1117c589", kill_on_drop: false }`
[INFO] [stdout] c79ef82fab2cf9c7a77db96062bf5d0329460293dea7dcaad8abde3f1117c589
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e6d941ae38cc9b6f432af4a37d8f7bfbc6c9f54b12731b1257e70d1c080d24df
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e6d941ae38cc9b6f432af4a37d8f7bfbc6c9f54b12731b1257e70d1c080d24df", kill_on_drop: false }`
[INFO] [stderr]    Compiling learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Debug`
[INFO] [stdout]  --> src/bin/traits.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Debug, Display};
[INFO] [stdout]   |                ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `reply`
[INFO] [stdout]  --> src/bin/traits.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     reply: bool,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `T` in this scope
[INFO] [stdout]   --> src/bin/adv_types.rs:18:30
[INFO] [stdout]    |
[INFO] [stdout] 18 | type Result = result::Result<T, io::Error>;
[INFO] [stdout]    |            -                 ^ not found in this scope
[INFO] [stdout]    |            |
[INFO] [stdout]    |            help: you might be missing a type parameter: `<T>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `retweet`
[INFO] [stdout]  --> src/bin/traits.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     retweet: bool,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `content`
[INFO] [stdout]   --> src/bin/traits.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     content: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tweet_summ`
[INFO] [stdout]   --> src/bin/traits.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn tweet_summ() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Pair`
[INFO] [stdout]   --> src/bin/traits.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 | struct Pair<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/bin/traits.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 |     fn new(x: T, y: T) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cmp_display`
[INFO] [stdout]   --> src/bin/traits.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn cmp_display(&self) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Screen`
[INFO] [stdout]   --> src/bin/traits.rs:78:8
[INFO] [stdout]    |
[INFO] [stdout] 78 | struct Screen {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `run`
[INFO] [stdout]   --> src/bin/traits.rs:83:8
[INFO] [stdout]    |
[INFO] [stdout] 83 |     fn run(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/bin/traits.rs:91:5
[INFO] [stdout]    |
[INFO] [stdout] 91 |     width: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/bin/traits.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 |     height: u32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `label`
[INFO] [stdout]   --> src/bin/traits.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 93 |     label: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_trait_object`
[INFO] [stdout]    --> src/bin/traits.rs:102:4
[INFO] [stdout]     |
[INFO] [stdout] 102 | fn use_trait_object() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/bin/adv_types.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn never_return() -> ! {
[INFO] [stdout]    |    ------------      ^ expected `!`, found `()`
[INFO] [stdout]    |    |
[INFO] [stdout]    |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected type `!`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0412.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `learning`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: function is never used: `return_closures`
[INFO] [stdout]  --> src/bin/adv_functions.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn return_closures() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_user`
[INFO] [stdout]   --> src/bin/structures.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn create_user() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_user_from_another`
[INFO] [stdout]   --> src/bin/structures.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_user_from_another() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/bin/structures.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Point(i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `named_tuple`
[INFO] [stdout]   --> src/bin/structures.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn named_tuple() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]   --> src/bin/methods.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/bin/methods.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `int`
[INFO] [stdout]   --> src/bin/generics.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let int = Point {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_int`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `float`
[INFO] [stdout]   --> src/bin/generics.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let float = Point {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/bin/generics.rs:59:20
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn some_func<T, U>(t: T, u: U) -> i32
[INFO] [stdout]    |                    ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/bin/generics.rs:59:26
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn some_func<T, U>(t: T, u: U) -> i32
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `weak_ref_cycle`
[INFO] [stdout]   --> src/bin/smart_ptr_cycle.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn weak_ref_cycle() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mutable_var`
[INFO] [stdout]  --> src/bin/variables.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn mutable_var() {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `pointers`
[INFO] [stdout]  --> src/bin/unsafe.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn pointers() {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_fn`
[INFO] [stdout]   --> src/bin/unsafe.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn unsafe_fn() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dangerous`
[INFO] [stdout]   --> src/bin/unsafe.rs:28:11
[INFO] [stdout]    |
[INFO] [stdout] 28 | unsafe fn dangerous() {}
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `safe_abstraction`
[INFO] [stdout]   --> src/bin/unsafe.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn safe_abstraction() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut`
[INFO] [stdout]   --> src/bin/unsafe.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `abs`
[INFO] [stdout]   --> src/bin/unsafe.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn abs(input: i32) -> i32;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static is never used: `HELLO_WORLD`
[INFO] [stdout]   --> src/bin/unsafe.rs:62:1
[INFO] [stdout]    |
[INFO] [stdout] 62 | static HELLO_WORLD: &str = "Hello, world!";
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_static_var`
[INFO] [stdout]   --> src/bin/unsafe.rs:64:4
[INFO] [stdout]    |
[INFO] [stdout] 64 | fn read_static_var() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]   --> src/bin/tests.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | struct Guess {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/bin/tests.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub fn new(value: u32) -> Guess {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `constant`
[INFO] [stdout]   --> src/bin/variables.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn constant() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `const_in_func`
[INFO] [stdout]   --> src/bin/variables.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn const_in_func() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `MAX_POINTS`
[INFO] [stdout]   --> src/bin/variables.rs:24:1
[INFO] [stdout]    |
[INFO] [stdout] 24 | const MAX_POINTS: u32 = 200_000;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multiple_vars`
[INFO] [stdout]   --> src/bin/variables.rs:26:4
[INFO] [stdout]    |
[INFO] [stdout] 26 | fn multiple_vars() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]  --> src/bin/generics.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn largest<T: PartialOrd + Copy>(list: &[T]) -> T {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `x`
[INFO] [stdout]   --> src/bin/generics.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn x(&self) -> &T {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_generic_point`
[INFO] [stdout]   --> src/bin/generics.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn create_generic_point() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_func`
[INFO] [stdout]   --> src/bin/generics.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn some_func<T, U>(t: T, u: U) -> i32
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `total`
[INFO] [stdout]   --> src/bin/iterators.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let total: i32 = v_iter.sum();
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_total`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/collections.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut v = vec![1, 2, 3, 4, 5];
[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: function is never used: `iter_terminated`
[INFO] [stdout]  --> src/bin/iterators.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn iter_terminated() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iter_adaptors`
[INFO] [stdout]   --> src/bin/iterators.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn iter_adaptors() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_vector`
[INFO] [stdout]  --> src/bin/collections.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn create_vector() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_value`
[INFO] [stdout]   --> src/bin/collections.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn get_value() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_hash_map`
[INFO] [stdout]   --> src/bin/collections.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn create_hash_map() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_stats`
[INFO] [stdout]   --> src/bin/collections.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn get_stats() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `stats`
[INFO] [stdout]   --> src/bin/collections.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn stats(v: &Vec<i32>) -> (f64, i32, i32) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/bin/data_types.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let z = x as u32 + y;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cast_to_unsigned`
[INFO] [stdout]  --> src/bin/data_types.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn cast_to_unsigned() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `representation_of_number`
[INFO] [stdout]   --> src/bin/data_types.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn representation_of_number() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `implicit_cast`
[INFO] [stdout]   --> src/bin/data_types.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn implicit_cast() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `std_f32`
[INFO] [stdout]   --> src/bin/data_types.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn std_f32() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `logic_op`
[INFO] [stdout]   --> src/bin/data_types.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn logic_op() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chars`
[INFO] [stdout]   --> src/bin/data_types.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn chars() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tuples`
[INFO] [stdout]   --> src/bin/data_types.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn tuples() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "e6d941ae38cc9b6f432af4a37d8f7bfbc6c9f54b12731b1257e70d1c080d24df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6d941ae38cc9b6f432af4a37d8f7bfbc6c9f54b12731b1257e70d1c080d24df", kill_on_drop: false }`
[INFO] [stdout] e6d941ae38cc9b6f432af4a37d8f7bfbc6c9f54b12731b1257e70d1c080d24df