[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#0cbcb17d3306d6e22eafc2c05ce885db97d0189c for pr-68766
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Delorus/rust_learning on toolchain 0cbcb17d3306d6e22eafc2c05ce885db97d0189c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+0cbcb17d3306d6e22eafc2c05ce885db97d0189c" "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-3/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" "+0cbcb17d3306d6e22eafc2c05ce885db97d0189c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+0cbcb17d3306d6e22eafc2c05ce885db97d0189c" "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] 41fd0a152e5cce6a4f8d54f0e6e947617a87b41c5bd7f827ee021c5fdc06efe7
[INFO] running `"docker" "start" "-a" "41fd0a152e5cce6a4f8d54f0e6e947617a87b41c5bd7f827ee021c5fdc06efe7"`
[INFO] [stderr]     Checking learning v0.1.0 (/opt/rustwide/workdir)
[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] 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]    |            help: you might be missing a type parameter: `<T>`
[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: function is never used: `longest`
[INFO] [stderr]  --> src/bin/lifetime.rs:7:4
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stderr]   --> src/bin/lifetime.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 | struct ImportantExcerpt<'a> {
[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] warning: function is never used: `lifetime_in_struct`
[INFO] [stderr]   --> src/bin/lifetime.rs:30:4
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn lifetime_in_struct() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest_with_an_announcement`
[INFO] [stderr]   --> src/bin/lifetime.rs:42:4
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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] error: could not compile `learning`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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: 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: 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: 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] 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: `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: `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: `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: `match_guard`
[INFO] [stderr]    --> src/bin/patterns.rs:103:4
[INFO] [stderr]     |
[INFO] [stderr] 103 | fn match_guard() {
[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: 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] 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_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] warning: function is never used: `longest`
[INFO] [stderr]  --> src/bin/lifetime.rs:7:4
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stderr]   --> src/bin/lifetime.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 | struct ImportantExcerpt<'a> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `lifetime_in_struct`
[INFO] [stderr]   --> src/bin/lifetime.rs:30:4
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn lifetime_in_struct() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest_with_an_announcement`
[INFO] [stderr]   --> src/bin/lifetime.rs:42:4
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[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: 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: 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: 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 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: `override_plus`
[INFO] [stderr]   --> src/bin/adv_traits.rs:24:4
[INFO] [stderr]    |
[INFO] [stderr] 24 | fn override_plus() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `fly`
[INFO] [stderr]   --> src/bin/adv_traits.rs:67:5
[INFO] [stderr]    |
[INFO] [stderr] 67 |     fn fly(&self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `several_realisation`
[INFO] [stderr]   --> src/bin/adv_traits.rs:72:4
[INFO] [stderr]    |
[INFO] [stderr] 72 | fn several_realisation() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Dog`
[INFO] [stderr]   --> src/bin/adv_traits.rs:83:8
[INFO] [stderr]    |
[INFO] [stderr] 83 | struct Dog;
[INFO] [stderr]    |        ^^^
[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: 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: method is never used: `baby_name`
[INFO] [stderr]   --> src/bin/adv_traits.rs:86:5
[INFO] [stderr]    |
[INFO] [stderr] 86 |     fn baby_name() -> String {
[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: `several_static_realisation`
[INFO] [stderr]   --> src/bin/adv_traits.rs:97:4
[INFO] [stderr]    |
[INFO] [stderr] 97 | fn several_static_realisation() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `newtype`
[INFO] [stderr]    --> src/bin/adv_traits.rs:142:4
[INFO] [stderr]     |
[INFO] [stderr] 142 | fn newtype() {
[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: `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] error: build failed
[INFO] running `"docker" "inspect" "41fd0a152e5cce6a4f8d54f0e6e947617a87b41c5bd7f827ee021c5fdc06efe7"`
[INFO] running `"docker" "rm" "-f" "41fd0a152e5cce6a4f8d54f0e6e947617a87b41c5bd7f827ee021c5fdc06efe7"`
[INFO] [stdout] 41fd0a152e5cce6a4f8d54f0e6e947617a87b41c5bd7f827ee021c5fdc06efe7