[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#bd0bacc694d7d8175804bb6f690cb846bfa4a9ee for pr-71665
[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 bd0bacc694d7d8175804bb6f690cb846bfa4a9ee
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "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" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "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" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 4c9a896ee850eaf4a3639bfc50fc14a9835953e8dbe6d9e1d6ee872a2de14369
[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" "4c9a896ee850eaf4a3639bfc50fc14a9835953e8dbe6d9e1d6ee872a2de14369"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking learning v0.1.0 (/opt/rustwide/workdir)
[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] 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: `connect`
[INFO] [stderr]  --> src/bin/modules/network/mod.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn connect() {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_module`
[INFO] [stderr]  --> src/bin/modules/network/mod.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn use_module() {
[INFO] [stderr]   |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `connect`
[INFO] [stderr]   --> src/bin/modules/network/mod.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn connect() {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_pub_modules`
[INFO] [stderr]   --> src/bin/modules_main.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn use_pub_modules() {
[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]    |            help: you might be missing a type parameter: `<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[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] [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[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: 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: 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: 1 warning emitted
[INFO] [stderr] 
[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] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `connect`
[INFO] [stderr]  --> src/bin/modules/network/mod.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn connect() {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_module`
[INFO] [stderr]  --> src/bin/modules/network/mod.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn use_module() {
[INFO] [stderr]   |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `connect`
[INFO] [stderr]   --> src/bin/modules/network/mod.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn connect() {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `use_pub_modules`
[INFO] [stderr]   --> src/bin/modules_main.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn use_pub_modules() {
[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: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[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 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: 4 warnings emitted
[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: `c`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:64:9
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let c = CustomSmartPointer { data: String::from("some data") };
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:79:9
[INFO] [stderr]    |
[INFO] [stderr] 79 |     let b = Tree::Cons(3, a.clone());
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:82:13
[INFO] [stderr]    |
[INFO] [stderr] 82 |         let c = Tree::Cons(4, a.clone());
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `square`
[INFO] [stderr]   --> src/bin/methods.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     fn square(size: u32) -> Rectangle {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `can_hold`
[INFO] [stderr]   --> src/bin/methods.rs:34:5
[INFO] [stderr]    |
[INFO] [stderr] 34 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 9 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `box_pointer`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn box_pointer() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `List`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:16:6
[INFO] [stderr]    |
[INFO] [stderr] 16 | enum List {
[INFO] [stderr]    |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `cons_list`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn cons_list() -> List {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `deref_smart_pointers`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:43:4
[INFO] [stderr]    |
[INFO] [stderr] 43 | fn deref_smart_pointers() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `data`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 |     data: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `drop_custom_smart_ptr`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:63:4
[INFO] [stderr]    |
[INFO] [stderr] 63 | fn drop_custom_smart_ptr() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Tree`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:69:6
[INFO] [stderr]    |
[INFO] [stderr] 69 | enum Tree {
[INFO] [stderr]    |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `cons_tree`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:74:4
[INFO] [stderr]    |
[INFO] [stderr] 74 | fn cons_tree() {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `immutably_borrows`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:88:4
[INFO] [stderr]    |
[INFO] [stderr] 88 | fn immutably_borrows(a: &i32) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutably_borrows`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:92:4
[INFO] [stderr]    |
[INFO] [stderr] 92 | fn mutably_borrows(b: &mut i32) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:96:4
[INFO] [stderr]    |
[INFO] [stderr] 96 | fn demo(r: &RefCell<i32>) {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `runtime_borrow_with_refcell`
[INFO] [stderr]    --> src/bin/smart_ponter.rs:102:4
[INFO] [stderr]     |
[INFO] [stderr] 102 | fn runtime_borrow_with_refcell() {
[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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it with an underscore: `_u`
[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: `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: associated function 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: 15 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:64:9
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let c = CustomSmartPointer { data: String::from("some data") };
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:79:9
[INFO] [stderr]    |
[INFO] [stderr] 79 |     let b = Tree::Cons(3, a.clone());
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:82:13
[INFO] [stderr]    |
[INFO] [stderr] 82 |         let c = Tree::Cons(4, a.clone());
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `box_pointer`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn box_pointer() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `List`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:16:6
[INFO] [stderr]    |
[INFO] [stderr] 16 | enum List {
[INFO] [stderr]    |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `cons_list`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn cons_list() -> List {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `deref_smart_pointers`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:43:4
[INFO] [stderr]    |
[INFO] [stderr] 43 | fn deref_smart_pointers() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `data`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:54:5
[INFO] [stderr]    |
[INFO] [stderr] 54 |     data: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `drop_custom_smart_ptr`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:63:4
[INFO] [stderr]    |
[INFO] [stderr] 63 | fn drop_custom_smart_ptr() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Tree`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:69:6
[INFO] [stderr]    |
[INFO] [stderr] 69 | enum Tree {
[INFO] [stderr]    |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `cons_tree`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:74:4
[INFO] [stderr]    |
[INFO] [stderr] 74 | fn cons_tree() {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `immutably_borrows`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:88:4
[INFO] [stderr]    |
[INFO] [stderr] 88 | fn immutably_borrows(a: &i32) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutably_borrows`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:92:4
[INFO] [stderr]    |
[INFO] [stderr] 92 | fn mutably_borrows(b: &mut i32) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo`
[INFO] [stderr]   --> src/bin/smart_ponter.rs:96:4
[INFO] [stderr]    |
[INFO] [stderr] 96 | fn demo(r: &RefCell<i32>) {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `runtime_borrow_with_refcell`
[INFO] [stderr]    --> src/bin/smart_ponter.rs:102:4
[INFO] [stderr]     |
[INFO] [stderr] 102 | fn runtime_borrow_with_refcell() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 15 warnings emitted
[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: associated function 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: associated function 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: `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: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4c9a896ee850eaf4a3639bfc50fc14a9835953e8dbe6d9e1d6ee872a2de14369"`
[INFO] running `"docker" "rm" "-f" "4c9a896ee850eaf4a3639bfc50fc14a9835953e8dbe6d9e1d6ee872a2de14369"`
[INFO] [stdout] 4c9a896ee850eaf4a3639bfc50fc14a9835953e8dbe6d9e1d6ee872a2de14369