[INFO] cloning 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" "clone" "--bare" "https://github.com/Delorus/rust_learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 85e9ac89dac5dca12156acf98619a6a7add91951
[INFO] checking Delorus/rust_learning against master#a5f164faad4a2fed606b8160fd7ecd2d5cbba381 for pr-84920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Delorus/rust_learning on toolchain a5f164faad4a2fed606b8160fd7ecd2d5cbba381
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-13/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" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f578a675eb3d1777ff8ef1fe7711937c0da6efe11cb78402c37ac7747834a1e9
[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" "f578a675eb3d1777ff8ef1fe7711937c0da6efe11cb78402c37ac7747834a1e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f578a675eb3d1777ff8ef1fe7711937c0da6efe11cb78402c37ac7747834a1e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f578a675eb3d1777ff8ef1fe7711937c0da6efe11cb78402c37ac7747834a1e9", kill_on_drop: false }`
[INFO] [stdout] f578a675eb3d1777ff8ef1fe7711937c0da6efe11cb78402c37ac7747834a1e9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0f96598e222fd16282abc041d9ad02bb0ad4266db770c2c481084ac15df50a99
[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" "0f96598e222fd16282abc041d9ad02bb0ad4266db770c2c481084ac15df50a99", kill_on_drop: false }`
[INFO] [stderr]     Checking learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `connect`
[INFO] [stdout]  --> src/bin/modules/network/mod.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn connect() {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_module`
[INFO] [stdout]  --> src/bin/modules/network/mod.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn use_module() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `connect`
[INFO] [stdout]   --> src/bin/modules/network/mod.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn connect() {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_pub_modules`
[INFO] [stdout]   --> src/bin/modules_main.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn use_pub_modules() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[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: function is never used: `return_value`
[INFO] [stdout]  --> src/bin/functions.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn return_value() -> 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: `not_return_value`
[INFO] [stdout]   --> src/bin/functions.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn not_return_value() -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[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: `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: `...` range patterns are deprecated
[INFO] [stdout]   --> src/bin/patterns.rs:19:10
[INFO] [stdout]    |
[INFO] [stdout] 19 |         1...5 => println!("one through five"),
[INFO] [stdout]    |          ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/bin/patterns.rs:121:45
[INFO] [stdout]     |
[INFO] [stdout] 121 |         Message::Hello { id: id_variable @ 3...7 } => {
[INFO] [stdout]     |                                             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/bin/patterns.rs:124:32
[INFO] [stdout]     |
[INFO] [stdout] 124 |         Message::Hello { id: 10...12 } => {
[INFO] [stdout]     |                                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[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] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/bin/multithreads.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` 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] 
[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] 
[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] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[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] [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] 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] [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] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[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] Some errors have detailed explanations: E0308, E0412.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `or_match`
[INFO] [stdout]  --> src/bin/patterns.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn or_match() {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `range_match`
[INFO] [stdout]   --> src/bin/patterns.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn range_match() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `destruct`
[INFO] [stdout]   --> src/bin/patterns.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn destruct() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Message`
[INFO] [stdout]   --> src/bin/patterns.rs:51:6
[INFO] [stdout]    |
[INFO] [stdout] 51 | enum Message {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `destruct_enum`
[INFO] [stdout]   --> src/bin/patterns.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn destruct_enum() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ignore_several_value`
[INFO] [stdout]   --> src/bin/patterns.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn ignore_several_value() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `match_guard`
[INFO] [stdout]    --> src/bin/patterns.rs:103:4
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn match_guard() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `binding_in_match`
[INFO] [stdout]    --> src/bin/patterns.rs:113:4
[INFO] [stdout]     |
[INFO] [stdout] 113 | fn binding_in_match() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let c = CustomSmartPointer { data: String::from("some data") };
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[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: unused variable: `b`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let b = Tree::Cons(3, a.clone());
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:82:13
[INFO] [stdout]    |
[INFO] [stdout] 82 |         let c = Tree::Cons(4, a.clone());
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `override_plus`
[INFO] [stdout]   --> src/bin/adv_traits.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn override_plus() {
[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: `fly`
[INFO] [stdout]   --> src/bin/adv_traits.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fn fly(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `several_realisation`
[INFO] [stdout]   --> src/bin/adv_traits.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn several_realisation() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `baby_name`
[INFO] [stdout]   --> src/bin/adv_traits.rs:86:8
[INFO] [stdout]    |
[INFO] [stdout] 86 |     fn baby_name() -> String {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `several_static_realisation`
[INFO] [stdout]   --> src/bin/adv_traits.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn several_static_realisation() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `newtype`
[INFO] [stdout]    --> src/bin/adv_traits.rs:142:4
[INFO] [stdout]     |
[INFO] [stdout] 142 | fn newtype() {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `box_pointer`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn box_pointer() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `List`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:16:6
[INFO] [stdout]    |
[INFO] [stdout] 16 | enum List {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cons_list`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn cons_list() -> List {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `deref_smart_pointers`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:43:4
[INFO] [stdout]    |
[INFO] [stdout] 43 | fn deref_smart_pointers() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `data`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     data: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `drop_custom_smart_ptr`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:63:4
[INFO] [stdout]    |
[INFO] [stdout] 63 | fn drop_custom_smart_ptr() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Tree`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:69:6
[INFO] [stdout]    |
[INFO] [stdout] 69 | enum Tree {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cons_tree`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn cons_tree() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `immutably_borrows`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:88:4
[INFO] [stdout]    |
[INFO] [stdout] 88 | fn immutably_borrows(a: &i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mutably_borrows`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:92:4
[INFO] [stdout]    |
[INFO] [stdout] 92 | fn mutably_borrows(b: &mut i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `demo`
[INFO] [stdout]   --> src/bin/smart_ponter.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn demo(r: &RefCell<i32>) {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `runtime_borrow_with_refcell`
[INFO] [stdout]    --> src/bin/smart_ponter.rs:102:4
[INFO] [stdout]     |
[INFO] [stdout] 102 | fn runtime_borrow_with_refcell() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_new_thread`
[INFO] [stdout]   --> src/bin/multithreads.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn create_new_thread() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:76:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let y = &x;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `wait_new_thread`
[INFO] [stdout]   --> src/bin/multithreads.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn wait_new_thread() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_closure_with_new_thread`
[INFO] [stdout]   --> src/bin/multithreads.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn move_closure_with_new_thread() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_channel`
[INFO] [stdout]   --> src/bin/multithreads.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn create_channel() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sending_multiple_values_in_channels`
[INFO] [stdout]   --> src/bin/multithreads.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn sending_multiple_values_in_channels() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mutex`
[INFO] [stdout]   --> src/bin/multithreads.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn mutex() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let mut z = &mut x;
[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: `change_string`
[INFO] [stdout]  --> src/bin/borrow_checker_ref_and_copy.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn change_string() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_string_borrowed`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn move_string_borrowed() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_ownership`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn move_ownership() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn takes_ownership(s: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_ownership`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn return_ownership() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_ownership_via_ref`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn return_ownership_via_ref() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ref_and_ownership`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn ref_and_ownership() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/multithreads.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     handle.join();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/multithreads.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     handle.join();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `override_plus`
[INFO] [stdout]   --> src/bin/adv_traits.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn override_plus() {
[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: `fly`
[INFO] [stdout]   --> src/bin/adv_traits.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 |     fn fly(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `several_realisation`
[INFO] [stdout]   --> src/bin/adv_traits.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn several_realisation() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `baby_name`
[INFO] [stdout]   --> src/bin/adv_traits.rs:86:8
[INFO] [stdout]    |
[INFO] [stdout] 86 |     fn baby_name() -> String {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `several_static_realisation`
[INFO] [stdout]   --> src/bin/adv_traits.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn several_static_realisation() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `newtype`
[INFO] [stdout]    --> src/bin/adv_traits.rs:142:4
[INFO] [stdout]     |
[INFO] [stdout] 142 | fn newtype() {
[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: 9 warnings emitted
[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: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "0f96598e222fd16282abc041d9ad02bb0ad4266db770c2c481084ac15df50a99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f96598e222fd16282abc041d9ad02bb0ad4266db770c2c481084ac15df50a99", kill_on_drop: false }`
[INFO] [stdout] 0f96598e222fd16282abc041d9ad02bb0ad4266db770c2c481084ac15df50a99