[INFO] cloning repository https://github.com/dragon-zhang/rust-study
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dragon-zhang/rust-study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdragon-zhang%2Frust-study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdragon-zhang%2Frust-study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] de588d312d38270a3dbf9713b8fffcc6fec6aa87
[INFO] testing dragon-zhang/rust-study against beta-2023-04-20 for beta-1.70-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdragon-zhang%2Frust-study" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dragon-zhang/rust-study on toolchain beta-2023-04-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dragon-zhang/rust-study
[INFO] finished tweaking git repo https://github.com/dragon-zhang/rust-study
[INFO] tweaked toml for git repo https://github.com/dragon-zhang/rust-study written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/dragon-zhang/rust-study 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" "+beta-2023-04-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] [stdout] 195e80d95ca44fd627835f049d177bc2f715c940f08a80e4aed8c4e0f9bf6c0f
[INFO] running `Command { std: "docker" "start" "-a" "195e80d95ca44fd627835f049d177bc2f715c940f08a80e4aed8c4e0f9bf6c0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "195e80d95ca44fd627835f049d177bc2f715c940f08a80e4aed8c4e0f9bf6c0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "195e80d95ca44fd627835f049d177bc2f715c940f08a80e4aed8c4e0f9bf6c0f", kill_on_drop: false }`
[INFO] [stdout] 195e80d95ca44fd627835f049d177bc2f715c940f08a80e4aed8c4e0f9bf6c0f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 17a120693505120e7d01ec99e7c005a609b63e5e4082716cca9a754e8daba94a
[INFO] running `Command { std: "docker" "start" "-a" "17a120693505120e7d01ec99e7c005a609b63e5e4082716cca9a754e8daba94a", kill_on_drop: false }`
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[INFO] [stdout] warning: field `f2` is never read
[INFO] [stdout]   --> src/lib.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub struct Struct {
[INFO] [stdout]    |                ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 25 |         f2: u32,
[INFO] [stdout]    |         ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fiber`
[INFO] [stdout]   --> src/bin/fiber.rs:30:34
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let fiber = Fiber::new(move |fiber, param| {
[INFO] [stdout]    |                                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_fiber`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `param`
[INFO] [stdout]   --> src/bin/fiber.rs:30:41
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let fiber = Fiber::new(move |fiber, param| {
[INFO] [stdout]    |                                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_param`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip`
[INFO] [stdout]   --> src/bin/43backtrace.rs:23:13
[INFO] [stdout]    |
[INFO] [stdout] 23 |         let ip = frame.ip();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_ip`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_account` and `get_password` are never used
[INFO] [stdout]   --> src/bin/06struct.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl<'a> User<'a> {
[INFO] [stdout]    | ----------------- methods in this implementation
[INFO] [stdout] 17 |     pub fn get_account(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn get_password(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Color` is never constructed
[INFO] [stdout]   --> src/bin/06struct.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Color(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `InnerUser` is never constructed
[INFO] [stdout]   --> src/bin/06struct.rs:64:8
[INFO] [stdout]    |
[INFO] [stdout] 64 | struct InnerUser<'a> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/bin/04ownership.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let s2 = s1;
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/bin/04ownership.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let r1 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/bin/04ownership.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let r2 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/bin/04ownership.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let r1 = &s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]   --> src/bin/04ownership.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let r2 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/bin/30super_trait.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct Point {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 12 |     x: i32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 13 |     y: i32,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Point` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line1`
[INFO] [stdout]   --> src/bin/19rc.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let line1 = GraphNode::node(1, Rc::clone(&common));
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_line1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line2`
[INFO] [stdout]   --> src/bin/19rc.rs:31:13
[INFO] [stdout]    |
[INFO] [stdout] 31 |         let line2 = GraphNode::node(2, Rc::clone(&common));
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_line2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 0 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 1 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 2 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 3 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 4 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 5 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 6 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 7 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 8 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 9 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 10 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 11 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 12 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 13 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 14 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 15 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 16 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 17 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 18 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 19 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 20 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 21 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 22 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 23 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 24 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 25 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 26 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 27 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 28 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 29 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 30 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` in tuple element 31 that must be used
[INFO] [stdout]   --> src/request.rs:7:5
[INFO] [stdout]    |
[INFO] [stdout] 7  | /     tokio::join!(request("1".to_string()),
[INFO] [stdout] 8  | |     request("2".to_string()),
[INFO] [stdout] 9  | |     request("3".to_string()),
[INFO] [stdout] 10 | |     request("4".to_string()),
[INFO] [stdout] ...  |
[INFO] [stdout] 37 | |     request("31".to_string()),
[INFO] [stdout] 38 | |     request("32".to_string()),);
[INFO] [stdout]    | |_______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Layout`, `alloc`
[INFO] [stdout]  --> src/bin/16box.rs:1:18
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::alloc::{alloc, Layout};
[INFO] [stdout]   |                  ^^^^^  ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/bin/10error.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 |         Err(e) => return Err("can not open test.txt"),
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/bin/10error.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |         Err(e) => Err("read test.txt failed"),
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/bin/10error.rs:12:21
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn spread_error<'a>(i: i8) -> Result<String, &'a str> {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/bin/10error.rs:29:13
[INFO] [stdout]    |
[INFO] [stdout] 29 |         Err(e) => return Err("can not open test.txt"),
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/bin/10error.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         Err(e) => Err("read test.txt failed"),
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/bin/10error.rs:25:37
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn spread_error_cannot_simplify<'a>(i: i8) -> Result<String, &'a str> {
[INFO] [stdout]    |                                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/bin/10error.rs:38:30
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn spread_error_can_simplify(i: i8) -> Result<String, Error> {
[INFO] [stdout]    |                              ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/bin/10error.rs:51:28
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn spread_error_simplified(i: i8) -> Result<String, Error> {
[INFO] [stdout]    |                            ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `List` is never used
[INFO] [stdout]   --> src/bin/16box.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum List {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `spread_error` is never used
[INFO] [stdout]   --> src/bin/10error.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn spread_error<'a>(i: i8) -> Result<String, &'a str> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `spread_error_cannot_simplify` is never used
[INFO] [stdout]   --> src/bin/10error.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn spread_error_cannot_simplify<'a>(i: i8) -> Result<String, &'a str> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `spread_error_can_simplify` is never used
[INFO] [stdout]   --> src/bin/10error.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn spread_error_can_simplify(i: i8) -> Result<String, Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `spread_error_simplified` is never used
[INFO] [stdout]   --> src/bin/10error.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn spread_error_simplified(i: i8) -> Result<String, Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0560]: struct `sockaddr_in` has no field named `sin_len`
[INFO] [stdout]   --> src/bin/33socket_server.rs:18:17
[INFO] [stdout]    |
[INFO] [stdout] 18 |                 sin_len: 0,
[INFO] [stdout]    |                 ^^^^^^^ `sockaddr_in` does not have this field
[INFO] [stdout]    |
[INFO] [stdout]    = note: available fields are: `sin_family`, `sin_port`, `sin_addr`, `sin_zero`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::mem`
[INFO] [stdout]  --> src/bin/35manually_drop.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/bin/33socket_server.rs:19:29
[INFO] [stdout]    |
[INFO] [stdout] 19 |                 sin_family: c::AF_INET as u8,
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^ expected `u16`, found `u8`
[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, E0560.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-study` (bin "33socket_server") due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> src/bin/37retry.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let result = Retry::spawn(retry_strategy, action).await?;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/bin/44generator.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(generators, generator_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/bin/44generator.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(generators, generator_trait)]
[INFO] [stdout]   |                        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-study` (bin "44generator") due to 3 previous errors
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 32 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "17a120693505120e7d01ec99e7c005a609b63e5e4082716cca9a754e8daba94a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17a120693505120e7d01ec99e7c005a609b63e5e4082716cca9a754e8daba94a", kill_on_drop: false }`
[INFO] [stdout] 17a120693505120e7d01ec99e7c005a609b63e5e4082716cca9a754e8daba94a
