[INFO] updating cached repository https://github.com/Delorus/rust_learning
[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] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 85e9ac89dac5dca12156acf98619a6a7add91951
[INFO] checking Delorus/rust_learning against master#2da942f32802c8233a09744024dfbc34431adf65 for pr-66963
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Delorus/rust_learning on toolchain 2da942f32802c8233a09744024dfbc34431adf65
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2da942f32802c8233a09744024dfbc34431adf65" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-6/source/Cargo.toml
[INFO] crate git repo https://github.com/Delorus/rust_learning already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2da942f32802c8233a09744024dfbc34431adf65" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=forbid" "-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" "+2da942f32802c8233a09744024dfbc34431adf65" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f3fecd1b26e26494a50481ffd8f6d6801fc893e66fcfa3b3d58098fd348740c7
[INFO] running `"docker" "start" "-a" "f3fecd1b26e26494a50481ffd8f6d6801fc893e66fcfa3b3d58098fd348740c7"`
[INFO] [stderr]     Checking learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `std::rc::Rc`
[INFO] [stderr]  --> src/bin/multithreads.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::rc::Rc;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `create_new_thread`
[INFO] [stderr]   --> src/bin/multithreads.rs:10:4
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn create_new_thread() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `wait_new_thread`
[INFO] [stderr]   --> src/bin/multithreads.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn wait_new_thread() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `move_closure_with_new_thread`
[INFO] [stderr]   --> src/bin/multithreads.rs:28:4
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn move_closure_with_new_thread() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `create_channel`
[INFO] [stderr]   --> src/bin/multithreads.rs:38:4
[INFO] [stderr]    |
[INFO] [stderr] 38 | fn create_channel() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sending_multiple_values_in_channels`
[INFO] [stderr]   --> src/bin/multithreads.rs:50:4
[INFO] [stderr]    |
[INFO] [stderr] 50 | fn sending_multiple_values_in_channels() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutex`
[INFO] [stderr]   --> src/bin/multithreads.rs:87:4
[INFO] [stderr]    |
[INFO] [stderr] 87 | fn mutex() {
[INFO] [stderr]    |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/multithreads.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     handle.join();
[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: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/multithreads.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     handle.join();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Debug`
[INFO] [stderr]  --> src/bin/traits.rs:1:16
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fmt::{Debug, Display};
[INFO] [stderr]   |                ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `reply`
[INFO] [stderr]  --> src/bin/traits.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     reply: bool,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `retweet`
[INFO] [stderr]  --> src/bin/traits.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     retweet: bool,
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `content`
[INFO] [stderr]   --> src/bin/traits.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     content: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tweet_summ`
[INFO] [stderr]   --> src/bin/traits.rs:38:4
[INFO] [stderr]    |
[INFO] [stderr] 38 | fn tweet_summ() {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Pair`
[INFO] [stderr]   --> src/bin/traits.rs:53:8
[INFO] [stderr]    |
[INFO] [stderr] 53 | struct Pair<T> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/bin/traits.rs:59:5
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn new(x: T, y: T) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `cmp_display`
[INFO] [stderr]   --> src/bin/traits.rs:65:5
[INFO] [stderr]    |
[INFO] [stderr] 65 |     fn cmp_display(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Screen`
[INFO] [stderr]   --> src/bin/traits.rs:78:8
[INFO] [stderr]    |
[INFO] [stderr] 78 | struct Screen {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `run`
[INFO] [stderr]   --> src/bin/traits.rs:83:5
[INFO] [stderr]    |
[INFO] [stderr] 83 |     fn run(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `width`
[INFO] [stderr]   --> src/bin/traits.rs:91:5
[INFO] [stderr]    |
[INFO] [stderr] 91 |     width: u32,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `height`
[INFO] [stderr]   --> src/bin/traits.rs:92:5
[INFO] [stderr]    |
[INFO] [stderr] 92 |     height: u32,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `label`
[INFO] [stderr]   --> src/bin/traits.rs:93:5
[INFO] [stderr]    |
[INFO] [stderr] 93 |     label: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_trait_object`
[INFO] [stderr]    --> src/bin/traits.rs:102:4
[INFO] [stderr]     |
[INFO] [stderr] 102 | fn use_trait_object() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutable_var`
[INFO] [stderr]  --> src/bin/variables.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn mutable_var() {
[INFO] [stderr]   |    ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `constant`
[INFO] [stderr]   --> src/bin/variables.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn constant() {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `const_in_func`
[INFO] [stderr]   --> src/bin/variables.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn const_in_func() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `MAX_POINTS`
[INFO] [stderr]   --> src/bin/variables.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | const MAX_POINTS: u32 = 200_000;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `multiple_vars`
[INFO] [stderr]   --> src/bin/variables.rs:26:4
[INFO] [stderr]    |
[INFO] [stderr] 26 | fn multiple_vars() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `return_value`
[INFO] [stderr]  --> src/bin/functions.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn return_value() -> i32 {
[INFO] [stderr]   |    ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `not_return_value`
[INFO] [stderr]   --> src/bin/functions.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn not_return_value() -> i32 {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/bin/patterns.rs:19:10
[INFO] [stderr]    |
[INFO] [stderr] 19 |         1...5 => println!("one through five"),
[INFO] [stderr]    |          ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/bin/patterns.rs:121:45
[INFO] [stderr]     |
[INFO] [stderr] 121 |         Message::Hello { id: id_variable @ 3...7 } => {
[INFO] [stderr]     |                                             ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/bin/patterns.rs:124:32
[INFO] [stderr]     |
[INFO] [stderr] 124 |         Message::Hello { id: 10...12 } => {
[INFO] [stderr]     |                                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `int`
[INFO] [stderr]   --> src/bin/generics.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |     let int = Point {
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_int`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `float`
[INFO] [stderr]   --> src/bin/generics.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |     let float = Point {
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_float`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t`
[INFO] [stderr]   --> src/bin/generics.rs:59:20
[INFO] [stderr]    |
[INFO] [stderr] 59 | fn some_func<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                    ^ help: consider prefixing with an underscore: `_t`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `u`
[INFO] [stderr]   --> src/bin/generics.rs:59:26
[INFO] [stderr]    |
[INFO] [stderr] 59 | fn some_func<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |                          ^ help: consider prefixing with an underscore: `_u`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `largest`
[INFO] [stderr]  --> src/bin/generics.rs:8:4
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn largest<T: PartialOrd + Copy>(list: &[T]) -> T {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `x`
[INFO] [stderr]   --> src/bin/generics.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 |     fn x(&self) -> &T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `create_generic_point`
[INFO] [stderr]   --> src/bin/generics.rs:38:4
[INFO] [stderr]    |
[INFO] [stderr] 38 | fn create_generic_point() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `some_func`
[INFO] [stderr]   --> src/bin/generics.rs:59:4
[INFO] [stderr]    |
[INFO] [stderr] 59 | fn some_func<T, U>(t: T, u: U) -> i32
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `weak_ref_cycle`
[INFO] [stderr]   --> src/bin/smart_ptr_cycle.rs:51:4
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn weak_ref_cycle() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/bin/state_pattern.rs:47:41
[INFO] [stderr]    |
[INFO] [stderr] 47 |         pub fn request_preview(self) -> PendingReviewPost {
[INFO] [stderr]    |                ---------------          ^^^^^^^^^^^^^^^^^ expected struct `blog::PendingReviewPost`, found `()`
[INFO] [stderr]    |                |
[INFO] [stderr]    |                implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `or_match`
[INFO] [stderr]  --> src/bin/patterns.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn or_match() {
[INFO] [stderr]   |    ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `range_match`
[INFO] [stderr]   --> src/bin/patterns.rs:15:4
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn range_match() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `T` in this scope
[INFO] [stderr]   --> src/bin/adv_types.rs:18:30
[INFO] [stderr]    |
[INFO] [stderr] 18 | type Result = result::Result<T, io::Error>;
[INFO] [stderr]    |                              ^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `destruct`
[INFO] [stderr]   --> src/bin/patterns.rs:29:4
[INFO] [stderr]    |
[INFO] [stderr] 29 | fn destruct() {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Message`
[INFO] [stderr]   --> src/bin/patterns.rs:51:6
[INFO] [stderr]    |
[INFO] [stderr] 51 | enum Message {
[INFO] [stderr]    |      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `destruct_enum`
[INFO] [stderr]   --> src/bin/patterns.rs:58:4
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn destruct_enum() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ignore_several_value`
[INFO] [stderr]   --> src/bin/patterns.rs:81:4
[INFO] [stderr]    |
[INFO] [stderr] 81 | fn ignore_several_value() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `match_guard`
[INFO] [stderr]    --> src/bin/patterns.rs:103:4
[INFO] [stderr]     |
[INFO] [stderr] 103 | fn match_guard() {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0308`.
[INFO] [stderr] warning: function is never used: `binding_in_match`
[INFO] [stderr]    --> src/bin/patterns.rs:113:4
[INFO] [stderr]     |
[INFO] [stderr] 113 | fn binding_in_match() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/bin/adv_types.rs:20:22
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn never_return() -> ! {
[INFO] [stderr]    |    ------------      ^ expected `!`, found `()`
[INFO] [stderr]    |    |
[INFO] [stderr]    |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stderr]    |
[INFO] [stderr]    = note:   expected type `!`
[INFO] [stderr]            found unit type `()`
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `learning`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0308, E0412.
[INFO] [stderr] For more information about an error, try `rustc --explain E0308`.
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]   --> src/bin/data_types.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let z = x as u32 + y;
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_z`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `return_closures`
[INFO] [stderr]  --> src/bin/adv_functions.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn return_closures() -> Box<dyn Fn(i32) -> i32> {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `learning`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: function is never used: `create_user`
[INFO] [stderr]   --> src/bin/structures.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn create_user() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `create_user_from_another`
[INFO] [stderr]   --> src/bin/structures.rs:28:4
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn create_user_from_another() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Point`
[INFO] [stderr]   --> src/bin/structures.rs:44:8
[INFO] [stderr]    |
[INFO] [stderr] 44 | struct Point(i32, i32);
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `named_tuple`
[INFO] [stderr]   --> src/bin/structures.rs:46:4
[INFO] [stderr]    |
[INFO] [stderr] 46 | fn named_tuple() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `cast_to_unsigned`
[INFO] [stderr]  --> src/bin/data_types.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn cast_to_unsigned() {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `representation_of_number`
[INFO] [stderr]   --> src/bin/data_types.rs:10:4
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn representation_of_number() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `implicit_cast`
[INFO] [stderr]   --> src/bin/data_types.rs:27:4
[INFO] [stderr]    |
[INFO] [stderr] 27 | fn implicit_cast() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `std_f32`
[INFO] [stderr]   --> src/bin/data_types.rs:34:4
[INFO] [stderr]    |
[INFO] [stderr] 34 | fn std_f32() {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `logic_op`
[INFO] [stderr]   --> src/bin/data_types.rs:71:4
[INFO] [stderr]    |
[INFO] [stderr] 71 | fn logic_op() {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `chars`
[INFO] [stderr]   --> src/bin/data_types.rs:87:4
[INFO] [stderr]    |
[INFO] [stderr] 87 | fn chars() {
[INFO] [stderr]    |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tuples`
[INFO] [stderr]   --> src/bin/data_types.rs:97:4
[INFO] [stderr]    |
[INFO] [stderr] 97 | fn tuples() {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ip4`
[INFO] [stderr]   --> src/bin/enums.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let ip4 = IpAddrKind::IPv4;
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_ip4`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ip6`
[INFO] [stderr]   --> src/bin/enums.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let ip6 = IpAddrKind::IPv6;
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_ip6`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loopback`
[INFO] [stderr]   --> src/bin/enums.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let loopback = IpAddr {
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `IpAddrKind`
[INFO] [stderr]  --> src/bin/enums.rs:6:6
[INFO] [stderr]   |
[INFO] [stderr] 6 | enum IpAddrKind {
[INFO] [stderr]   |      ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `create_enum`
[INFO] [stderr]   --> src/bin/enums.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn create_enum() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/bin/borrow_checker_ref_and_copy.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |     let y = &x;
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `IpAddr`
[INFO] [stderr]   --> src/bin/enums.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | struct IpAddr {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `create_struct_with_enum`
[INFO] [stderr]   --> src/bin/enums.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn create_struct_with_enum() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `pointers`
[INFO] [stderr]  --> src/bin/unsafe.rs:7:4
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn pointers() {
[INFO] [stderr]   |    ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]   --> src/bin/enums.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     Quit,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/bin/enums.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     Move { x: i32, y: i32 },
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `unsafe_fn`
[INFO] [stderr]   --> src/bin/unsafe.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 | fn unsafe_fn() {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `dangerous`
[INFO] [stderr]   --> src/bin/unsafe.rs:28:11
[INFO] [stderr]    |
[INFO] [stderr] 28 | unsafe fn dangerous() {}
[INFO] [stderr]    |           ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Write`
[INFO] [stderr]   --> src/bin/enums.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     Write(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/bin/enums.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     ChangeColor(i32, i32, i32),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `call`
[INFO] [stderr]   --> src/bin/enums.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 37 |     fn call(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `call_message`
[INFO] [stderr]   --> src/bin/enums.rs:44:4
[INFO] [stderr]    |
[INFO] [stderr] 44 | fn call_message() {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alabama`
[INFO] [stderr]   --> src/bin/enums.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     Alabama,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `safe_abstraction`
[INFO] [stderr]   --> src/bin/unsafe.rs:30:4
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn safe_abstraction() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alaska`
[INFO] [stderr]   --> src/bin/enums.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     Alaska
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Coin`
[INFO] [stderr]   --> src/bin/enums.rs:55:6
[INFO] [stderr]    |
[INFO] [stderr] 55 | enum Coin {
[INFO] [stderr]    |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `split_at_mut`
[INFO] [stderr]   --> src/bin/unsafe.rs:41:4
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `value_in_cents`
[INFO] [stderr]   --> src/bin/enums.rs:62:4
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn value_in_cents(coin: Coin) -> u32 {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_plus_one`
[INFO] [stderr]   --> src/bin/enums.rs:74:4
[INFO] [stderr]    |
[INFO] [stderr] 74 | fn get_plus_one() {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: foreign function is never used: `abs`
[INFO] [stderr]   --> src/bin/unsafe.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 |     fn abs(input: i32) -> i32;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static item is never used: `HELLO_WORLD`
[INFO] [stderr]   --> src/bin/unsafe.rs:62:1
[INFO] [stderr]    |
[INFO] [stderr] 62 | static HELLO_WORLD: &str = "Hello, world!";
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_static_var`
[INFO] [stderr]   --> src/bin/unsafe.rs:64:4
[INFO] [stderr]    |
[INFO] [stderr] 64 | fn read_static_var() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/borrow_checker_ref_and_copy.rs:77:9
[INFO] [stderr]    |
[INFO] [stderr] 77 |     let mut z = &mut x;
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `change_string`
[INFO] [stderr]  --> src/bin/borrow_checker_ref_and_copy.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn change_string() {
[INFO] [stderr]   |    ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `move_string_borrowed`
[INFO] [stderr]   --> src/bin/borrow_checker_ref_and_copy.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn move_string_borrowed() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `move_ownership`
[INFO] [stderr]   --> src/bin/borrow_checker_ref_and_copy.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn move_ownership() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_ownership`
[INFO] [stderr]   --> src/bin/borrow_checker_ref_and_copy.rs:29:4
[INFO] [stderr]    |
[INFO] [stderr] 29 | fn takes_ownership(s: String) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `return_ownership`
[INFO] [stderr]   --> src/bin/borrow_checker_ref_and_copy.rs:33:4
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn return_ownership() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `return_ownership_via_ref`
[INFO] [stderr]   --> src/bin/borrow_checker_ref_and_copy.rs:51:4
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn return_ownership_via_ref() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ref_and_ownership`
[INFO] [stderr]   --> src/bin/borrow_checker_ref_and_copy.rs:62:4
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn ref_and_ownership() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Debug`
[INFO] [stderr]  --> src/bin/traits.rs:1:16
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fmt::{Debug, Display};
[INFO] [stderr]   |                ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `reply`
[INFO] [stderr]  --> src/bin/traits.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     reply: bool,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `retweet`
[INFO] [stderr]  --> src/bin/traits.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     retweet: bool,
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `content`
[INFO] [stderr]   --> src/bin/traits.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     content: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tweet_summ`
[INFO] [stderr]   --> src/bin/traits.rs:38:4
[INFO] [stderr]    |
[INFO] [stderr] 38 | fn tweet_summ() {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Pair`
[INFO] [stderr]   --> src/bin/traits.rs:53:8
[INFO] [stderr]    |
[INFO] [stderr] 53 | struct Pair<T> {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/bin/traits.rs:59:5
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn new(x: T, y: T) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `cmp_display`
[INFO] [stderr]   --> src/bin/traits.rs:65:5
[INFO] [stderr]    |
[INFO] [stderr] 65 |     fn cmp_display(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Screen`
[INFO] [stderr]   --> src/bin/traits.rs:78:8
[INFO] [stderr]    |
[INFO] [stderr] 78 | struct Screen {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `run`
[INFO] [stderr]   --> src/bin/traits.rs:83:5
[INFO] [stderr]    |
[INFO] [stderr] 83 |     fn run(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `width`
[INFO] [stderr]   --> src/bin/traits.rs:91:5
[INFO] [stderr]    |
[INFO] [stderr] 91 |     width: u32,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `height`
[INFO] [stderr]   --> src/bin/traits.rs:92:5
[INFO] [stderr]    |
[INFO] [stderr] 92 |     height: u32,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `label`
[INFO] [stderr]   --> src/bin/traits.rs:93:5
[INFO] [stderr]    |
[INFO] [stderr] 93 |     label: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_trait_object`
[INFO] [stderr]    --> src/bin/traits.rs:102:4
[INFO] [stderr]     |
[INFO] [stderr] 102 | fn use_trait_object() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `total`
[INFO] [stderr]   --> src/bin/iterators.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let total: i32 = v_iter.sum();
[INFO] [stderr]    |         ^^^^^ help: consider prefixing with an underscore: `_total`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `iter_terminated`
[INFO] [stderr]  --> src/bin/iterators.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn iter_terminated() {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `iter_adaptors`
[INFO] [stderr]   --> src/bin/iterators.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn iter_adaptors() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "f3fecd1b26e26494a50481ffd8f6d6801fc893e66fcfa3b3d58098fd348740c7"`
[INFO] running `"docker" "rm" "-f" "f3fecd1b26e26494a50481ffd8f6d6801fc893e66fcfa3b3d58098fd348740c7"`
[INFO] [stdout] f3fecd1b26e26494a50481ffd8f6d6801fc893e66fcfa3b3d58098fd348740c7