[INFO] updating cached repository https://github.com/Delorus/rust_learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 85e9ac89dac5dca12156acf98619a6a7add91951
[INFO] testing Delorus/rust_learning against try#03a1ea71b075ab964b5278bc6e74cd6c52c36ee0 for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Delorus/rust_learning on toolchain 03a1ea71b075ab964b5278bc6e74cd6c52c36ee0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Delorus/rust_learning
[INFO] finished tweaking git repo https://github.com/Delorus/rust_learning
[INFO] tweaked toml for git repo https://github.com/Delorus/rust_learning written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/Delorus/rust_learning already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3bf0dca3204a5d4e67b6f4eb1914e8efb10f9da2840916eadb5c003d8a8262d2
[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" "3bf0dca3204a5d4e67b6f4eb1914e8efb10f9da2840916eadb5c003d8a8262d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3bf0dca3204a5d4e67b6f4eb1914e8efb10f9da2840916eadb5c003d8a8262d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3bf0dca3204a5d4e67b6f4eb1914e8efb10f9da2840916eadb5c003d8a8262d2", kill_on_drop: false }`
[INFO] [stdout] 3bf0dca3204a5d4e67b6f4eb1914e8efb10f9da2840916eadb5c003d8a8262d2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 31578b35b7a2f7e55bacc3b7859562cc585c86acbe4867bda0258184323a21df
[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" "31578b35b7a2f7e55bacc3b7859562cc585c86acbe4867bda0258184323a21df", kill_on_drop: false }`
[INFO] [stderr]    Compiling learning v0.1.0 (/opt/rustwide/workdir)
[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: 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: 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] error[E0308]: mismatched types
[INFO] [stdout]   --> src/bin/state_pattern.rs:47:41
[INFO] [stdout]    |
[INFO] [stdout] 47 |         pub fn request_preview(self) -> PendingReviewPost {
[INFO] [stdout]    |                ---------------          ^^^^^^^^^^^^^^^^^ expected struct `blog::PendingReviewPost`, found `()`
[INFO] [stdout]    |                |
[INFO] [stdout]    |                implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `learning`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] 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[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] warning: unused variable: `int`
[INFO] [stdout]   --> src/bin/generics.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let int = Point {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_int`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `float`
[INFO] [stdout]   --> src/bin/generics.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let float = Point {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/bin/generics.rs:59:20
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn some_func<T, U>(t: T, u: U) -> i32
[INFO] [stdout]    |                    ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/bin/generics.rs:59:26
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn some_func<T, U>(t: T, u: U) -> i32
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip4`
[INFO] [stdout]   --> src/bin/enums.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let ip4 = IpAddrKind::IPv4;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_ip4`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest`
[INFO] [stdout]  --> src/bin/generics.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn largest<T: PartialOrd + Copy>(list: &[T]) -> T {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `x`
[INFO] [stdout]   --> src/bin/generics.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn x(&self) -> &T {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_generic_point`
[INFO] [stdout]   --> src/bin/generics.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn create_generic_point() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `some_func`
[INFO] [stdout]   --> src/bin/generics.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn some_func<T, U>(t: T, u: U) -> i32
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 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: unused variable: `ip6`
[INFO] [stdout]   --> src/bin/enums.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let ip6 = IpAddrKind::IPv6;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_ip6`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/bin/enums.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let loopback = IpAddr {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[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: `create_user`
[INFO] [stdout]   --> src/bin/structures.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn create_user() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_user_from_another`
[INFO] [stdout]   --> src/bin/structures.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_user_from_another() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/bin/structures.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Point(i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `named_tuple`
[INFO] [stdout]   --> src/bin/structures.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn named_tuple() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `IpAddrKind`
[INFO] [stdout]  --> src/bin/enums.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum IpAddrKind {
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_enum`
[INFO] [stdout]   --> src/bin/enums.rs:11:4
[INFO] [stdout]    |
[INFO] [stdout] 11 | fn create_enum() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `IpAddr`
[INFO] [stdout]   --> src/bin/enums.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct IpAddr {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_struct_with_enum`
[INFO] [stdout]   --> src/bin/enums.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn create_struct_with_enum() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/bin/enums.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     Quit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/bin/enums.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     Move { x: i32, y: i32 },
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]   --> src/bin/enums.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 |     Write(String),
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/bin/enums.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     ChangeColor(i32, i32, i32),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/bin/enums.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `call_message`
[INFO] [stdout]   --> src/bin/enums.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn call_message() {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]   --> src/bin/enums.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     Alabama,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]   --> src/bin/enums.rs:52:5
[INFO] [stdout]    |
[INFO] [stdout] 52 |     Alaska
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]   --> src/bin/enums.rs:55:6
[INFO] [stdout]    |
[INFO] [stdout] 55 | enum Coin {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `value_in_cents`
[INFO] [stdout]   --> src/bin/enums.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn value_in_cents(coin: Coin) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_plus_one`
[INFO] [stdout]   --> src/bin/enums.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn get_plus_one() {
[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: 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: 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: `iter_terminated`
[INFO] [stdout]  --> src/bin/iterators.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn iter_terminated() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iter_adaptors`
[INFO] [stdout]   --> src/bin/iterators.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn iter_adaptors() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `pointers`
[INFO] [stdout]  --> src/bin/unsafe.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn pointers() {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `unsafe_fn`
[INFO] [stdout]   --> src/bin/unsafe.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn unsafe_fn() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `dangerous`
[INFO] [stdout]   --> src/bin/unsafe.rs:28:11
[INFO] [stdout]    |
[INFO] [stdout] 28 | unsafe fn dangerous() {}
[INFO] [stdout]    |           ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `safe_abstraction`
[INFO] [stdout]   --> src/bin/unsafe.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn safe_abstraction() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut`
[INFO] [stdout]   --> src/bin/unsafe.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `abs`
[INFO] [stdout]   --> src/bin/unsafe.rs:54:5
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn abs(input: i32) -> i32;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static is never used: `HELLO_WORLD`
[INFO] [stdout]   --> src/bin/unsafe.rs:62:1
[INFO] [stdout]    |
[INFO] [stdout] 62 | static HELLO_WORLD: &str = "Hello, world!";
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `read_static_var`
[INFO] [stdout]   --> src/bin/unsafe.rs:64:4
[INFO] [stdout]    |
[INFO] [stdout] 64 | fn read_static_var() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest`
[INFO] [stdout]  --> src/bin/lifetime.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stdout]   --> src/bin/lifetime.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | struct ImportantExcerpt<'a> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `lifetime_in_struct`
[INFO] [stdout]   --> src/bin/lifetime.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn lifetime_in_struct() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `longest_with_an_announcement`
[INFO] [stdout]   --> src/bin/lifetime.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/collections.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut v = vec![1, 2, 3, 4, 5];
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_vector`
[INFO] [stdout]  --> src/bin/collections.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn create_vector() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_value`
[INFO] [stdout]   --> src/bin/collections.rs:16:4
[INFO] [stdout]    |
[INFO] [stdout] 16 | fn get_value() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_hash_map`
[INFO] [stdout]   --> src/bin/collections.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn create_hash_map() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_stats`
[INFO] [stdout]   --> src/bin/collections.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn get_stats() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `stats`
[INFO] [stdout]   --> src/bin/collections.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn stats(v: &Vec<i32>) -> (f64, i32, i32) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 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: 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: 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: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "31578b35b7a2f7e55bacc3b7859562cc585c86acbe4867bda0258184323a21df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31578b35b7a2f7e55bacc3b7859562cc585c86acbe4867bda0258184323a21df", kill_on_drop: false }`
[INFO] [stdout] 31578b35b7a2f7e55bacc3b7859562cc585c86acbe4867bda0258184323a21df