[INFO] cloning repository https://github.com/monadplus/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/monadplus/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmonadplus%2Frust-playground", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 58061259c3b5bf5070dcab071de4efa0a5a463c6
[INFO] checking monadplus/rust-playground against try#d1d7143153307f561233bd4d93e2a3b24157b081 for pr-151539-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmonadplus%2Frust-playground" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-7-tc2/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/monadplus/rust-playground
[INFO] finished tweaking git repo https://github.com/monadplus/rust-playground
[INFO] tweaked toml for git repo https://github.com/monadplus/rust-playground written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/monadplus/rust-playground on toolchain d1d7143153307f561233bd4d93e2a3b24157b081
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d1d7143153307f561233bd4d93e2a3b24157b081" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/monadplus/rust-playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d1d7143153307f561233bd4d93e2a3b24157b081" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 0ecef30ef86df4646fe76048a55671bdc6a4bec0469e2c4d02a096e132db51ac
[INFO] running `Command { std: "docker" "start" "0ecef30ef86df4646fe76048a55671bdc6a4bec0469e2c4d02a096e132db51ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "0ecef30ef86df4646fe76048a55671bdc6a4bec0469e2c4d02a096e132db51ac" "/opt/rustwide/cargo-home/bin/cargo" "+d1d7143153307f561233bd4d93e2a3b24157b081" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ecef30ef86df4646fe76048a55671bdc6a4bec0469e2c4d02a096e132db51ac", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `std::borrow::Cow`
[INFO] [stdout]  --> src/cow.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::borrow::Cow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rust_decimal_macros::dec`
[INFO] [stdout]  --> src/decimal.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rust_decimal_macros::dec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde_json::json`
[INFO] [stdout]  --> src/decimal.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use serde_json::json;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `thread`
[INFO] [stdout]  --> src/diy/channel/channel4.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     thread,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc` and `thread`
[INFO] [stdout]  --> src/diy/channel/channel5.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         Arc,
[INFO] [stdout]   |         ^^^
[INFO] [stdout] 7 |     },
[INFO] [stdout] 8 |     thread,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc` and `time::Duration`
[INFO] [stdout]   --> src/diy/channel/channel6.rs:7:9
[INFO] [stdout]    |
[INFO] [stdout]  7 |         Arc,
[INFO] [stdout]    |         ^^^
[INFO] [stdout] ...
[INFO] [stdout] 10 |     time::Duration,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::atomic::compiler_fence`
[INFO] [stdout]  --> src/experiment_1.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::atomic::compiler_fence;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::pin_mut`
[INFO] [stdout]  --> src/experiment_4.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use futures::pin_mut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/jiff_example.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `jsonschema::JSONSchema`
[INFO] [stdout]  --> src/json_schema.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use jsonschema::JSONSchema;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `schema::RootSchema` and `schema_for`
[INFO] [stdout]  --> src/json_schema.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use schemars::{schema::RootSchema, schema_for, JsonSchema};
[INFO] [stdout]   |                ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Value` and `json`
[INFO] [stdout]  --> src/json_schema.rs:4:18
[INFO] [stdout]   |
[INFO] [stdout] 4 | use serde_json::{json, Value};
[INFO] [stdout]   |                  ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/match_causes_deadlock.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::sync::RwLock`
[INFO] [stdout]  --> src/match_causes_deadlock.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use tokio::sync::RwLock;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `StreamExt` and `stream::FuturesUnordered`
[INFO] [stdout]  --> src/unordered_futures.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use futures::{stream::FuturesUnordered, StreamExt};
[INFO] [stdout]   |               ^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Arc`
[INFO] [stdout]  --> src/diy/channel/channel5.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |         Arc,
[INFO] [stdout]   |         ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Arc`
[INFO] [stdout]  --> src/diy/channel/channel6.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |         Arc,
[INFO] [stdout]   |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/jiff_example.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `mpsc`
[INFO] [stdout]  --> src/notify.rs:7:21
[INFO] [stdout]   |
[INFO] [stdout] 7 |     use std::sync::{mpsc, Arc, Mutex};
[INFO] [stdout]   |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/from_str_radix.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let mut index = bytes.len() - 1;
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/jiff_example.rs:12:11
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn foo<T>(t: T) {
[INFO] [stdout]    |           ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `zdt`
[INFO] [stdout]   --> src/jiff_example.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let zdt = Zoned::now()
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_zdt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/lifetimes_1.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let x = if let Some(base) = self.base() {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `db`
[INFO] [stdout]   --> src/stream.rs:62:25
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn fetch<'a, 'e: 'a, T>(db: &'e mut DB) -> BoxStream<'a, T>
[INFO] [stdout]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_db`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stream`
[INFO] [stdout]   --> src/stream.rs:70:9
[INFO] [stdout]    |
[INFO] [stdout] 70 |     let stream = stream::iter(1..100).map(|_| DB).flat_map(|mut db| {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_stream`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Counter` is never constructed
[INFO] [stdout]  --> src/arc_swap.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Counter {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `add_one` is never used
[INFO] [stdout]  --> src/arc_swap.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl Counter {
[INFO] [stdout]   | ------------ method in this implementation
[INFO] [stdout] 7 |     fn add_one(&mut self) {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]  --> src/async_trait.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | async fn foo() {}
[INFO] [stdout]   |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Hello` is never used
[INFO] [stdout]  --> src/async_trait.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | trait Hello {
[INFO] [stdout]   |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Wrapper` is never constructed
[INFO] [stdout]   --> src/async_trait.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Wrapper<A: ?Sized>(A);
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Trait` is never used
[INFO] [stdout]   --> src/async_trait.rs:16:7
[INFO] [stdout]    |
[INFO] [stdout] 16 | trait Trait<A: Hello> {
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Nod` is never constructed
[INFO] [stdout]  --> src/box_dropping.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Nod {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Ptr` is never constructed
[INFO] [stdout]  --> src/box_dropping.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Ptr {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/box_dropping.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl Ptr {
[INFO] [stdout]    | -------- associated function in this implementation
[INFO] [stdout] 22 |     fn new(name: &str) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_prime_ugly` is never used
[INFO] [stdout]  --> src/codewars/is_prime.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn is_prime_ugly(x: i64) -> bool {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_prime` is never used
[INFO] [stdout]   --> src/codewars/is_prime.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn is_prime(x: i64) -> bool {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_greater_eq` is never used
[INFO] [stdout]   --> src/compare_mixed_numeric_types.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn is_greater_eq(x: i64, y: f64) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_less` is never used
[INFO] [stdout]   --> src/compare_mixed_numeric_types.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn is_less(x: i64, y: f64) -> bool {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fibonacci_compile_time` is never used
[INFO] [stdout]  --> src/compile_time.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 | const fn fibonacci_compile_time(n: u32) -> u128 {
[INFO] [stdout]   |          ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `FIB_100` is never used
[INFO] [stdout]   --> src/compile_time.rs:21:7
[INFO] [stdout]    |
[INFO] [stdout] 21 | const FIB_100: u128 = fibonacci_compile_time(100);
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `COUNTER` is never used
[INFO] [stdout]  --> src/cow.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | static COUNTER: AtomicU8 = AtomicU8::new(0);
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cloned` is never constructed
[INFO] [stdout]  --> src/cow.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Cloned<T>(T);
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Item` is never constructed
[INFO] [stdout]  --> src/decimal.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Item {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Backend` is never used
[INFO] [stdout]  --> src/dispatch/dynamic.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | trait Backend {
[INFO] [stdout]   |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveBackend` is never constructed
[INFO] [stdout]  --> src/dispatch/dynamic.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct PositiveBackend;
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NegativeBackend` is never constructed
[INFO] [stdout]   --> src/dispatch/dynamic.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct NegativeBackend;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/dispatch/dynamic.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveBackend` is never constructed
[INFO] [stdout]  --> src/dispatch/static_dispatch.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct PositiveBackend;
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `compute` is never used
[INFO] [stdout]  --> src/dispatch/static_dispatch.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl PositiveBackend {
[INFO] [stdout]   | -------------------- method in this implementation
[INFO] [stdout] 7 |     #[inline(never)]
[INFO] [stdout] 8 |     fn compute(&self, number: u64) -> u64 {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/dispatch/static_dispatch.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Foo` is never used
[INFO] [stdout]  --> src/dyn_trait.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait Foo {}
[INFO] [stdout]   |       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Foo` is never used
[INFO] [stdout]  --> src/enum_discriminant.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Foo {
[INFO] [stdout]   |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyA` is never constructed
[INFO] [stdout]  --> src/experiment_1.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct MyA<A> {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyB` is never constructed
[INFO] [stdout]   --> src/experiment_1.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct MyB;
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `to_b` is never used
[INFO] [stdout]   --> src/experiment_1.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn to_b<A>(_a: MyA<A>) -> MyB {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyC` is never constructed
[INFO] [stdout]   --> src/experiment_1.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct MyC<C> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `to_c` is never used
[INFO] [stdout]   --> src/experiment_1.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn to_c<A>(a: MyA<A>) -> MyC<A> {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Either` is never used
[INFO] [stdout]  --> src/experiment_2.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum Either<L, R> {
[INFO] [stdout]   |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Void` is never used
[INFO] [stdout]  --> src/experiment_2.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum Void {}
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `never_left` is never used
[INFO] [stdout]  --> src/experiment_2.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn never_left(e: Either<Void, String>) -> String {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `from_hex` is never used
[INFO] [stdout]  --> src/experiment_3.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn from_hex(hex_string: String) -> Result<u64, String> {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `T1` is never constructed
[INFO] [stdout]  --> src/experiment_4.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct T1 {
[INFO] [stdout]   |        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `a`, and `b` are never used
[INFO] [stdout]   --> src/experiment_4.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl T1 {
[INFO] [stdout]    | ------- associated items in this implementation
[INFO] [stdout] 12 |     fn new(a: &str) -> Pin<Box<Self>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     fn a(self: Pin<&Self>) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     fn b(self: Pin<&Self>) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `T2` is never constructed
[INFO] [stdout]   --> src/experiment_4.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct T2 {
[INFO] [stdout]    |        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `init`, `a`, and `b` are never used
[INFO] [stdout]   --> src/experiment_4.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | impl T2 {
[INFO] [stdout]    | ------- associated items in this implementation
[INFO] [stdout] 49 |     fn new(a: &str) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 57 |     fn init(self: Pin<&mut Self>) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     fn a(self: Pin<&Self>) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] ...
[INFO] [stdout] 66 |     fn b(self: Pin<&Self>) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ParseIntError` is never constructed
[INFO] [stdout]  --> src/from_str_radix.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct ParseIntError {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IntErrorKind` is never used
[INFO] [stdout]   --> src/from_str_radix.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum IntErrorKind {
[INFO] [stdout]    |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `from_str_radix` is never used
[INFO] [stdout]   --> src/from_str_radix.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn from_str_radix(input: &str, radix: usize) -> Result<usize, ParseIntError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> src/jiff_example.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn foo<T>(t: T) {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `A` is never constructed
[INFO] [stdout]  --> src/lifetimes_1.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct A;
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `nothing` is never used
[INFO] [stdout]  --> src/lifetimes_1.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl A {
[INFO] [stdout]   | ------ method in this implementation
[INFO] [stdout] 7 |     fn nothing(&mut self) {}
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Other` is never used
[INFO] [stdout]   --> src/lifetimes_1.rs:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 | trait Other<'a> {
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Base` is never used
[INFO] [stdout]   --> src/lifetimes_1.rs:17:7
[INFO] [stdout]    |
[INFO] [stdout] 17 | trait Base<'a> {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Super` is never used
[INFO] [stdout]   --> src/lifetimes_1.rs:26:7
[INFO] [stdout]    |
[INFO] [stdout] 26 | trait Super<'a> {
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Unmovable` is never constructed
[INFO] [stdout]  --> src/pin.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Unmovable {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/pin.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl Unmovable {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 12 |     fn new(data: String) -> Pin<Box<Self>> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Config` is never constructed
[INFO] [stdout]  --> src/serde.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Config {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `BoolOrTime` is never used
[INFO] [stdout]   --> src/serde.rs:11:6
[INFO] [stdout]    |
[INFO] [stdout] 11 | enum BoolOrTime {
[INFO] [stdout]    |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `deserialize_disabled_field_2` is never used
[INFO] [stdout]   --> src/serde.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn deserialize_disabled_field_2<'de, D>(de: D) -> Result<(), D::Error>
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `handle_signals` is never used
[INFO] [stdout]   --> src/signal_hook.rs:46:14
[INFO] [stdout]    |
[INFO] [stdout] 46 |     async fn handle_signals(mut signals: Signals) {
[INFO] [stdout]    |              ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main_thread` is never used
[INFO] [stdout]   --> src/signal_hook.rs:62:14
[INFO] [stdout]    |
[INFO] [stdout] 62 |     async fn main_thread() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DB` is never constructed
[INFO] [stdout]   --> src/stream.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct DB;
[INFO] [stdout]    |        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `T` is never constructed
[INFO] [stdout]   --> src/stream.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | struct T;
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fetch` is never used
[INFO] [stdout]   --> src/stream.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn fetch<'a, 'e: 'a, T>(db: &'e mut DB) -> BoxStream<'a, T>
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stream_value_ref` is never used
[INFO] [stdout]   --> src/stream.rs:69:10
[INFO] [stdout]    |
[INFO] [stdout] 69 | async fn stream_value_ref() {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `do_something` is never used
[INFO] [stdout]  --> src/unordered_futures.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | async fn do_something(i: u8) -> String {
[INFO] [stdout]   |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/channel/channel5.rs:35:18
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn split(&mut self) -> (Sender<T>, Receiver<T>) {
[INFO] [stdout]    |                  ^^^^^^^^^      ^^^^^^^^^  ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |              |
[INFO] [stdout]    |                  |              the same lifetime is hidden here
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn split(&mut self) -> (Sender<'_, T>, Receiver<'_, T>) {
[INFO] [stdout]    |                                        +++              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/channel/channel6.rs:39:18
[INFO] [stdout]    |
[INFO] [stdout] 39 |     pub fn split(&mut self) -> (Sender<T>, Receiver<T>) {
[INFO] [stdout]    |                  ^^^^^^^^^      ^^^^^^^^^  ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |              |
[INFO] [stdout]    |                  |              the same lifetime is hidden here
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 39 |     pub fn split(&mut self) -> (Sender<'_, T>, Receiver<'_, T>) {
[INFO] [stdout]    |                                        +++              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/mutex/mutex_1.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<'_, T> {
[INFO] [stdout]    |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/mutex/mutex_2.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<'_, T> {
[INFO] [stdout]    |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/mutex/mutex_3.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<'_, T> {
[INFO] [stdout]    |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_1.rs:23:17
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn read(&self) -> ReadGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn read(&self) -> ReadGuard<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_1.rs:45:18
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn write(&self) -> WriteGuard<T> {
[INFO] [stdout]    |                  ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn write(&self) -> WriteGuard<'_, T> {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_2.rs:26:17
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn read(&self) -> ReadGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn read(&self) -> ReadGuard<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_2.rs:48:18
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn write(&self) -> WriteGuard<T> {
[INFO] [stdout]    |                  ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn write(&self) -> WriteGuard<'_, T> {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_3.rs:30:17
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn read(&self) -> ReadGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn read(&self) -> ReadGuard<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_3.rs:54:18
[INFO] [stdout]    |
[INFO] [stdout] 54 |     pub fn write(&self) -> WriteGuard<T> {
[INFO] [stdout]    |                  ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 54 |     pub fn write(&self) -> WriteGuard<'_, T> {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/spinlock.rs:24:17
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn lock(&self) -> LockGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn lock(&self) -> LockGuard<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> src/main.rs:1:14
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() -> anyhow::Result<()> {}
[INFO] [stdout]   |    ----      ^^^^^^^^^^^^^^^^^^ expected `Result<(), Error>`, found `()`
[INFO] [stdout]   |    |
[INFO] [stdout]   |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]   |
[INFO] [stdout]   = note:   expected enum `Result<(), anyhow::Error>`
[INFO] [stdout]           found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `playground` (bin "playground") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> src/main.rs:1:14
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() -> anyhow::Result<()> {}
[INFO] [stdout]   |    ----      ^^^^^^^^^^^^^^^^^^ expected `Result<(), Error>`, found `()`
[INFO] [stdout]   |    |
[INFO] [stdout]   |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]   |
[INFO] [stdout]   = note:   expected enum `Result<(), anyhow::Error>`
[INFO] [stdout]           found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `playground` (bin "playground" test) due to 1 previous error
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> src/decimal.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let p = Decimal::from_scientific("3.16912650057e+25").unwrap();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/experiment_4.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let mut t = T1::new("hello");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/from_str_radix.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let mut index = bytes.len() - 1;
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/jiff_example.rs:12:11
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn foo<T>(t: T) {
[INFO] [stdout]    |           ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `zdt`
[INFO] [stdout]   --> src/jiff_example.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let zdt = Zoned::now()
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_zdt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/lifetimes_1.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let x = if let Some(base) = self.base() {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `db`
[INFO] [stdout]   --> src/stream.rs:62:25
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn fetch<'a, 'e: 'a, T>(db: &'e mut DB) -> BoxStream<'a, T>
[INFO] [stdout]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_db`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stream`
[INFO] [stdout]   --> src/stream.rs:70:9
[INFO] [stdout]    |
[INFO] [stdout] 70 |     let stream = stream::iter(1..100).map(|_| DB).flat_map(|mut db| {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_stream`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a`, `b`, and `c` are never read
[INFO] [stdout]   --> src/alignment.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     struct A1 {
[INFO] [stdout]    |            -- fields in this struct
[INFO] [stdout] 59 |         a: u8,
[INFO] [stdout]    |         ^
[INFO] [stdout] 60 |         b: u8,
[INFO] [stdout]    |         ^
[INFO] [stdout] 61 |         c: u16,
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a`, `b`, and `c` are never read
[INFO] [stdout]   --> src/alignment.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 64 |     struct A2 {
[INFO] [stdout]    |            -- fields in this struct
[INFO] [stdout] 65 |         a: u8,
[INFO] [stdout]    |         ^
[INFO] [stdout] 66 |         b: u16,
[INFO] [stdout]    |         ^
[INFO] [stdout] 67 |         c: u8,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a1` and `a2` are never read
[INFO] [stdout]    --> src/alignment.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     struct A {
[INFO] [stdout]     |            - fields in this struct
[INFO] [stdout] 107 |         a1: u8,
[INFO] [stdout]     |         ^^
[INFO] [stdout] 108 |         a2: u8,
[INFO] [stdout]     |         ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `b1` and `b2` are never read
[INFO] [stdout]    --> src/alignment.rs:121:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |     struct C {
[INFO] [stdout]     |            - fields in this struct
[INFO] [stdout] 121 |         b1: u8,
[INFO] [stdout]     |         ^^
[INFO] [stdout] 122 |         b2: u16,
[INFO] [stdout]     |         ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a1` and `a2` are never read
[INFO] [stdout]    --> src/alignment.rs:132:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |     struct A {
[INFO] [stdout]     |            - fields in this struct
[INFO] [stdout] 132 |         a1: u16,
[INFO] [stdout]     |         ^^
[INFO] [stdout] 133 |         a2: u8,
[INFO] [stdout]     |         ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `b1` and `b2` are never read
[INFO] [stdout]    --> src/alignment.rs:137:9
[INFO] [stdout]     |
[INFO] [stdout] 136 |     struct B {
[INFO] [stdout]     |            - fields in this struct
[INFO] [stdout] 137 |         b1: u8,
[INFO] [stdout]     |         ^^
[INFO] [stdout] 138 |         b2: u8,
[INFO] [stdout]     |         ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]  --> src/async_trait.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | async fn foo() {}
[INFO] [stdout]   |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Hello` is never used
[INFO] [stdout]  --> src/async_trait.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | trait Hello {
[INFO] [stdout]   |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Wrapper` is never constructed
[INFO] [stdout]   --> src/async_trait.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct Wrapper<A: ?Sized>(A);
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Trait` is never used
[INFO] [stdout]   --> src/async_trait.rs:16:7
[INFO] [stdout]    |
[INFO] [stdout] 16 | trait Trait<A: Hello> {
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]  --> src/box_dropping.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Nod {
[INFO] [stdout]   |        --- field in this struct
[INFO] [stdout] 5 |     name: String,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Nod` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_prime_ugly` is never used
[INFO] [stdout]  --> src/codewars/is_prime.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn is_prime_ugly(x: i64) -> bool {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_greater_eq` is never used
[INFO] [stdout]   --> src/compare_mixed_numeric_types.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn is_greater_eq(x: i64, y: f64) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_less` is never used
[INFO] [stdout]   --> src/compare_mixed_numeric_types.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn is_less(x: i64, y: f64) -> bool {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fibonacci_compile_time` is never used
[INFO] [stdout]  --> src/compile_time.rs:2:10
[INFO] [stdout]   |
[INFO] [stdout] 2 | const fn fibonacci_compile_time(n: u32) -> u128 {
[INFO] [stdout]   |          ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `FIB_100` is never used
[INFO] [stdout]   --> src/compile_time.rs:21:7
[INFO] [stdout]    |
[INFO] [stdout] 21 | const FIB_100: u128 = fibonacci_compile_time(100);
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Backend` is never used
[INFO] [stdout]  --> src/dispatch/dynamic.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | trait Backend {
[INFO] [stdout]   |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveBackend` is never constructed
[INFO] [stdout]  --> src/dispatch/dynamic.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct PositiveBackend;
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `NegativeBackend` is never constructed
[INFO] [stdout]   --> src/dispatch/dynamic.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct NegativeBackend;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/dispatch/dynamic.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveBackend` is never constructed
[INFO] [stdout]  --> src/dispatch/static_dispatch.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct PositiveBackend;
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `compute` is never used
[INFO] [stdout]  --> src/dispatch/static_dispatch.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl PositiveBackend {
[INFO] [stdout]   | -------------------- method in this implementation
[INFO] [stdout] 7 |     #[inline(never)]
[INFO] [stdout] 8 |     fn compute(&self, number: u64) -> u64 {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/dispatch/static_dispatch.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `c` is never read
[INFO] [stdout]  --> src/dyn_trait.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     struct C<'a> {
[INFO] [stdout]   |            - field in this struct
[INFO] [stdout] 8 |         c: Vec<&'a dyn Foo>,
[INFO] [stdout]   |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `c` is never read
[INFO] [stdout]   --> src/dyn_trait.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     struct C {
[INFO] [stdout]    |            - field in this struct
[INFO] [stdout] 19 |         c: Vec<Box<dyn Foo>>,
[INFO] [stdout]    |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `c` is never read
[INFO] [stdout]   --> src/experiment_1.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | struct MyC<C> {
[INFO] [stdout]    |        --- field in this struct
[INFO] [stdout] 25 |     c: C,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MyC` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Either` is never used
[INFO] [stdout]  --> src/experiment_2.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum Either<L, R> {
[INFO] [stdout]   |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Void` is never used
[INFO] [stdout]  --> src/experiment_2.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum Void {}
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `never_left` is never used
[INFO] [stdout]  --> src/experiment_2.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn never_left(e: Either<Void, String>) -> String {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ParseIntError` is never constructed
[INFO] [stdout]  --> src/from_str_radix.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct ParseIntError {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `IntErrorKind` is never used
[INFO] [stdout]   --> src/from_str_radix.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum IntErrorKind {
[INFO] [stdout]    |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `from_str_radix` is never used
[INFO] [stdout]   --> src/from_str_radix.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn from_str_radix(input: &str, radix: usize) -> Result<usize, ParseIntError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first` is never used
[INFO] [stdout]    --> src/gat.rs:173:8
[INFO] [stdout]     |
[INFO] [stdout] 173 |     fn first<'i, T>(iterable: &'i impl Iterable<Item<'i> = &'i T>) -> Option<&'i T> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sendable_items` is never used
[INFO] [stdout]    --> src/gat.rs:177:8
[INFO] [stdout]     |
[INFO] [stdout] 177 |     fn sendable_items<I>(_iterable: &I)
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> src/jiff_example.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn foo<T>(t: T) {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `COUNT` is never constructed
[INFO] [stdout]   --> src/lazy_static.rs:36:20
[INFO] [stdout]    |
[INFO] [stdout] 36 |         static ref COUNT: usize = HASHMAP.len();
[INFO] [stdout]    |                    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `lazy_static` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `A` is never constructed
[INFO] [stdout]  --> src/lifetimes_1.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct A;
[INFO] [stdout]   |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `nothing` is never used
[INFO] [stdout]  --> src/lifetimes_1.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | impl A {
[INFO] [stdout]   | ------ method in this implementation
[INFO] [stdout] 7 |     fn nothing(&mut self) {}
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Other` is never used
[INFO] [stdout]   --> src/lifetimes_1.rs:12:7
[INFO] [stdout]    |
[INFO] [stdout] 12 | trait Other<'a> {
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Base` is never used
[INFO] [stdout]   --> src/lifetimes_1.rs:17:7
[INFO] [stdout]    |
[INFO] [stdout] 17 | trait Base<'a> {
[INFO] [stdout]    |       ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Super` is never used
[INFO] [stdout]   --> src/lifetimes_1.rs:26:7
[INFO] [stdout]    |
[INFO] [stdout] 26 | trait Super<'a> {
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DB` is never constructed
[INFO] [stdout]   --> src/stream.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct DB;
[INFO] [stdout]    |        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `T` is never constructed
[INFO] [stdout]   --> src/stream.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | struct T;
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fetch` is never used
[INFO] [stdout]   --> src/stream.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn fetch<'a, 'e: 'a, T>(db: &'e mut DB) -> BoxStream<'a, T>
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `stream_value_ref` is never used
[INFO] [stdout]   --> src/stream.rs:69:10
[INFO] [stdout]    |
[INFO] [stdout] 69 | async fn stream_value_ref() {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/channel/channel5.rs:35:18
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn split(&mut self) -> (Sender<T>, Receiver<T>) {
[INFO] [stdout]    |                  ^^^^^^^^^      ^^^^^^^^^  ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |              |
[INFO] [stdout]    |                  |              the same lifetime is hidden here
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn split(&mut self) -> (Sender<'_, T>, Receiver<'_, T>) {
[INFO] [stdout]    |                                        +++              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/channel/channel6.rs:39:18
[INFO] [stdout]    |
[INFO] [stdout] 39 |     pub fn split(&mut self) -> (Sender<T>, Receiver<T>) {
[INFO] [stdout]    |                  ^^^^^^^^^      ^^^^^^^^^  ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |              |
[INFO] [stdout]    |                  |              the same lifetime is hidden here
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 39 |     pub fn split(&mut self) -> (Sender<'_, T>, Receiver<'_, T>) {
[INFO] [stdout]    |                                        +++              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/mutex/mutex_1.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<'_, T> {
[INFO] [stdout]    |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/mutex/mutex_2.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<'_, T> {
[INFO] [stdout]    |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/mutex/mutex_3.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pub fn lock(&self) -> MutexGuard<'_, T> {
[INFO] [stdout]    |                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_1.rs:23:17
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn read(&self) -> ReadGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub fn read(&self) -> ReadGuard<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_1.rs:45:18
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn write(&self) -> WriteGuard<T> {
[INFO] [stdout]    |                  ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn write(&self) -> WriteGuard<'_, T> {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_2.rs:26:17
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn read(&self) -> ReadGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 26 |     pub fn read(&self) -> ReadGuard<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_2.rs:48:18
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn write(&self) -> WriteGuard<T> {
[INFO] [stdout]    |                  ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 48 |     pub fn write(&self) -> WriteGuard<'_, T> {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_3.rs:30:17
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn read(&self) -> ReadGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub fn read(&self) -> ReadGuard<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/rwlock/rwlock_3.rs:54:18
[INFO] [stdout]    |
[INFO] [stdout] 54 |     pub fn write(&self) -> WriteGuard<T> {
[INFO] [stdout]    |                  ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 54 |     pub fn write(&self) -> WriteGuard<'_, T> {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/diy/spinlock.rs:24:17
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn lock(&self) -> LockGuard<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub fn lock(&self) -> LockGuard<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the type `u8` does not permit being left uninitialized
[INFO] [stdout]   --> src/maybe_uninit.rs:10:26
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let x: u8 = unsafe { mem::MaybeUninit::uninit().assume_init() };
[INFO] [stdout]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |                          |
[INFO] [stdout]    |                          this code causes undefined behavior when executed
[INFO] [stdout]    |                          help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
[INFO] [stdout]    |
[INFO] [stdout]    = note: integers must be initialized
[INFO] [stdout]    = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0ecef30ef86df4646fe76048a55671bdc6a4bec0469e2c4d02a096e132db51ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ecef30ef86df4646fe76048a55671bdc6a4bec0469e2c4d02a096e132db51ac", kill_on_drop: false }`
[INFO] [stdout] 0ecef30ef86df4646fe76048a55671bdc6a4bec0469e2c4d02a096e132db51ac
