[INFO] cloning repository https://github.com/zachlefevre/rust-learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zachlefevre/rust-learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzachlefevre%2Frust-learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzachlefevre%2Frust-learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6e8771639450277fa7f86da2484b047b58836690
[INFO] checking zachlefevre/rust-learning against try#a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d for pr-145342-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzachlefevre%2Frust-learning" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/zachlefevre/rust-learning
[INFO] finished tweaking git repo https://github.com/zachlefevre/rust-learning
[INFO] tweaked toml for git repo https://github.com/zachlefevre/rust-learning written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/zachlefevre/rust-learning on toolchain a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/zachlefevre/rust-learning 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" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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_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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6defc5f5a46193520d59d49da13278438767f1d22069ceaa5077f50f2af85bad
[INFO] running `Command { std: "docker" "start" "-a" "6defc5f5a46193520d59d49da13278438767f1d22069ceaa5077f50f2af85bad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6defc5f5a46193520d59d49da13278438767f1d22069ceaa5077f50f2af85bad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6defc5f5a46193520d59d49da13278438767f1d22069ceaa5077f50f2af85bad", kill_on_drop: false }`
[INFO] [stdout] 6defc5f5a46193520d59d49da13278438767f1d22069ceaa5077f50f2af85bad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0e9012787d7f45acc954220100ce9129b0771cc04fb93e17c80a55ec294b7528
[INFO] running `Command { std: "docker" "start" "-a" "0e9012787d7f45acc954220100ce9129b0771cc04fb93e17c80a55ec294b7528", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling autocfg v1.3.0
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]     Checking smallvec v1.13.2
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling serde v1.0.203
[INFO] [stderr]     Checking pin-project-lite v0.2.14
[INFO] [stderr]     Checking bytes v1.6.0
[INFO] [stderr]    Compiling lock_api v0.4.12
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]     Checking getrandom v0.2.15
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking mio v0.8.11
[INFO] [stderr]     Checking socket2 v0.5.7
[INFO] [stderr]     Checking signal-hook-registry v1.4.2
[INFO] [stderr]    Compiling syn v2.0.68
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking parking_lot v0.12.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling tokio-macros v2.3.0
[INFO] [stderr]    Compiling serde_derive v1.0.203
[INFO] [stderr]     Checking tokio v1.38.0
[INFO] [stderr]     Checking practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `show` is never used
[INFO] [stdout]  --> src/bin/box-owned.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait Show {
[INFO] [stdout]   |       ---- method in this trait
[INFO] [stdout] 2 |     fn show_ref(&self);
[INFO] [stdout] 3 |     fn show(self);
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/bin/typeclasses.rs:62:17
[INFO] [stdout]    |
[INFO] [stdout] 62 |             let s = ai.0;
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FileDownloadRequest` is never constructed
[INFO] [stdout]   --> src/bin/typeclasses.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     struct FileDownloadRequest<P: protocol::Protocol> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mount_point` is never used
[INFO] [stdout]   --> src/bin/typeclasses.rs:59:12
[INFO] [stdout]    |
[INFO] [stdout] 58 |     impl FileDownloadRequest<protocol::Nfs> {
[INFO] [stdout]    |     --------------------------------------- method in this implementation
[INFO] [stdout] 59 |         fn mount_point(&self) -> &String {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `other` is never used
[INFO] [stdout]   --> src/bin/typeclasses.rs:68:12
[INFO] [stdout]    |
[INFO] [stdout] 67 |     impl FileDownloadRequest<protocol::Bootp> {
[INFO] [stdout]    |     ----------------------------------------- method in this implementation
[INFO] [stdout] 68 |         fn other(&self) -> i32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `AuthInfo` is never constructed
[INFO] [stdout]  --> src/bin/typeclasses.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 |         pub struct AuthInfo(pub String);
[INFO] [stdout]   |                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `AuthInfo` is never constructed
[INFO] [stdout]   --> src/bin/typeclasses.rs:10:20
[INFO] [stdout]    |
[INFO] [stdout] 10 |         pub struct AuthInfo(pub i32);
[INFO] [stdout]    |                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TransferParameters` is never constructed
[INFO] [stdout]   --> src/bin/typeclasses.rs:17:20
[INFO] [stdout]    |
[INFO] [stdout] 17 |         pub struct TransferParameters {
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Protocol` is never used
[INFO] [stdout]   --> src/bin/typeclasses.rs:22:19
[INFO] [stdout]    |
[INFO] [stdout] 22 |         pub trait Protocol {
[INFO] [stdout]    |                   ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Nfs` is never constructed
[INFO] [stdout]   --> src/bin/typeclasses.rs:28:20
[INFO] [stdout]    |
[INFO] [stdout] 28 |         pub struct Nfs {
[INFO] [stdout]    |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Bootp` is never constructed
[INFO] [stdout]   --> src/bin/typeclasses.rs:41:20
[INFO] [stdout]    |
[INFO] [stdout] 41 |         pub struct Bootp;
[INFO] [stdout]    |                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `[_; 0]: std::io::Read` is not satisfied
[INFO] [stdout]  --> src/bin/bufread_test.rs:7:37
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut reader = BufReader::new(input);
[INFO] [stdout]   |                      -------------- ^^^^^ the trait `std::io::Read` is not implemented for `[_; 0]`
[INFO] [stdout]   |                      |
[INFO] [stdout]   |                      required by a bound introduced by this call
[INFO] [stdout]   |
[INFO] [stdout]   = help: the trait `std::io::Read` is implemented for `&[u8]`
[INFO] [stdout] note: required by a bound in `BufReader::<R>::new`
[INFO] [stdout]  --> /rustc/a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d/library/std/src/io/buffered/bufreader.rs:73:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/bin/files.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |         dbg!(String::from_utf8(buf.to_vec()));
[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] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 9 |         let _ = dbg!(String::from_utf8(buf.to_vec()));
[INFO] [stdout]   |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Foo` is never constructed
[INFO] [stdout]  --> src/bin/rename-serde.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Foo {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `dothingErrors` should have an upper camel case name
[INFO] [stdout]  --> src/bin/consumed_arg_err.rs:1:6
[INFO] [stdout]   |
[INFO] [stdout] 1 | enum dothingErrors {
[INFO] [stdout]   |      ^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `DothingErrors`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> src/bin/asref.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let b = a.as_ref();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple patterns overlap on their endpoints
[INFO] [stdout]  --> src/bin/matches.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |         0..=8 => "true",
[INFO] [stdout]   |         ----- this range overlaps on `8_i32`...
[INFO] [stdout] 4 |         8..=18 => "true again",
[INFO] [stdout]   |         ^^^^^^ ... with this range
[INFO] [stdout]   |
[INFO] [stdout]   = note: you likely meant to write mutually exclusive ranges
[INFO] [stdout]   = note: `#[warn(overlapping_range_endpoints)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0004]: non-exhaustive patterns: `i32::MIN..=-1_i32` and `19_i32..=i32::MAX` not covered
[INFO] [stdout]  --> src/bin/matches.rs:2:19
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let v = match 2 {
[INFO] [stdout]   |                   ^ patterns `i32::MIN..=-1_i32` and `19_i32..=i32::MAX` not covered
[INFO] [stdout]   |
[INFO] [stdout]   = note: the matched value is of type `i32`
[INFO] [stdout] help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern, a match arm with multiple or-patterns as shown, or multiple match arms
[INFO] [stdout]   |
[INFO] [stdout] 4 ~         8..=18 => "true again",
[INFO] [stdout] 5 ~         i32::MIN..=-1_i32 | 19_i32..=i32::MAX => todo!(),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0004`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `practice` (bin "matches") due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `buf`
[INFO] [stdout]  --> src/bin/io.rs:5:24
[INFO] [stdout]   |
[INFO] [stdout] 5 |     fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
[INFO] [stdout]   |                        ^^^ help: if this is intentional, prefix it with an underscore: `_buf`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `read_line` exists for struct `BufReader<[_; 0]>`, but its trait bounds were not satisfied
[INFO] [stdout]   --> src/bin/bufread_test.rs:13:26
[INFO] [stdout]    |
[INFO] [stdout] 13 |     while let _ = reader.read_line(&mut buf).unwrap() {
[INFO] [stdout]    |                          ^^^^^^^^^ method cannot be called on `BufReader<[_; 0]>` due to unsatisfied trait bounds
[INFO] [stdout]    |
[INFO] [stdout]    = note: the following trait bounds were not satisfied:
[INFO] [stdout]            `[_; 0]: std::io::Read`
[INFO] [stdout]            which is required by `BufReader<[_; 0]>: BufRead`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::iter::Chain` that must be used
[INFO] [stdout]  --> src/bin/chain.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     dbg!(vec![1, 2, 3, 4, 5].iter().chain(Some(8).iter()));
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let _ = dbg!(vec![1, 2, 3, 4, 5].iter().chain(Some(8).iter()));
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `buf`
[INFO] [stdout]   --> src/bin/io.rs:11:25
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
[INFO] [stdout]    |                         ^^^ help: if this is intentional, prefix it with an underscore: `_buf`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `amt`
[INFO] [stdout]   --> src/bin/io.rs:25:27
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn consume(&mut self, amt: usize) {
[INFO] [stdout]    |                           ^^^ help: if this is intentional, prefix it with an underscore: `_amt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/bin/io.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn foo(n: &dyn BufRead) {
[INFO] [stdout]    |        ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]   --> src/bin/io.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let writer = BufWriter::new(file);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Foo` is never constructed
[INFO] [stdout]  --> src/bin/io.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Foo;
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo` is never used
[INFO] [stdout]   --> src/bin/io.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn foo(n: &dyn BufRead) {
[INFO] [stdout]    |    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `practice` (bin "bufread_test" test) due to 2 previous errors
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/consumed_arg_err.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | /     retry(s, dothing, |e| {
[INFO] [stdout] 21 | |         match e {
[INFO] [stdout] 22 | |             dothingErrors::SomethingWentWrong(e) => e
[INFO] [stdout] 23 | |         }
[INFO] [stdout] 24 | |     }, 1);
[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] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let _ = retry(s, dothing, |e| {
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TcpSocket` and `task`
[INFO] [stdout]  --> src/bin/service-trait.rs:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | use tokio::{net::{TcpListener, TcpSocket, TcpStream}, task};
[INFO] [stdout]   |                                ^^^^^^^^^              ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `response`
[INFO] [stdout]   --> src/bin/service-trait.rs:33:18
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn respond_error(response: std::io::Error, socket: &TcpStream) {
[INFO] [stdout]    |                  ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_response`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `socket`
[INFO] [stdout]   --> src/bin/service-trait.rs:33:44
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn respond_error(response: std::io::Error, socket: &TcpStream) {
[INFO] [stdout]    |                                            ^^^^^^ help: if this is intentional, prefix it with an underscore: `_socket`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `response`
[INFO] [stdout]   --> src/bin/service-trait.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn respond(response: Response, socket: &TcpStream) {
[INFO] [stdout]    |            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_response`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `socket`
[INFO] [stdout]   --> src/bin/service-trait.rs:36:32
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn respond(response: Response, socket: &TcpStream) {
[INFO] [stdout]    |                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_socket`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `socket`
[INFO] [stdout]   --> src/bin/service-trait.rs:41:17
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn make_request(socket: &TcpStream) -> Request {
[INFO] [stdout]    |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_socket`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Server` is never constructed
[INFO] [stdout]  --> src/bin/service-trait.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Server {
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Request` is never constructed
[INFO] [stdout]  --> src/bin/service-trait.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Request;
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Response` is never constructed
[INFO] [stdout]   --> src/bin/service-trait.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Response;
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `run` is never used
[INFO] [stdout]   --> src/bin/service-trait.rs:14:14
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl Server {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] 14 |     async fn run<F, Fut>(self, handler: F) -> Result<(), std::io::Error>
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `respond_error` is never used
[INFO] [stdout]   --> src/bin/service-trait.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn respond_error(response: std::io::Error, socket: &TcpStream) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `respond` is never used
[INFO] [stdout]   --> src/bin/service-trait.rs:36:4
[INFO] [stdout]    |
[INFO] [stdout] 36 | fn respond(response: Response, socket: &TcpStream) {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `make_request` is never used
[INFO] [stdout]   --> src/bin/service-trait.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn make_request(socket: &TcpStream) -> Request {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Chunks` that must be used
[INFO] [stdout]  --> src/bin/chunk.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     dbg!(vec![1, 2, 3, 4, 5, 6, 7, 8].chunks(3));
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let _ = dbg!(vec![1, 2, 3, 4, 5, 6, 7, 8].chunks(3));
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/io.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     dbg!(String::from_utf8(v));
[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] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let _ = dbg!(String::from_utf8(v));
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> src/bin/asref.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let b = a.as_ref();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chained`
[INFO] [stdout]   --> src/bin/iterators.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let chained = a.into_iter().chain(b);
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_chained`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/bin/index.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn index(&self, i: f32) -> &Self:: Output {
[INFO] [stdout]   |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]  --> src/bin/index.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn index(&self, i: f32) -> &Self:: Output {
[INFO] [stdout]   |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/iterators.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     dbg!(a);
[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] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let _ = dbg!(a);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/bin/3-channel-consume.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     t1.send(1).await;
[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] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let _ = t1.send(1).await;
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/bin/3-channel-consume.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     t2.send(2).await;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let _ = t2.send(2).await;
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/bin/3-channel-consume.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     t3.send(3).await;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let _ = t3.send(3).await;
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main2` is never used
[INFO] [stdout]  --> src/bin/select.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | async fn main2() {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main3` is never used
[INFO] [stdout]   --> src/bin/select.rs:19:10
[INFO] [stdout]    |
[INFO] [stdout] 19 | async fn main3() {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main4` is never used
[INFO] [stdout]   --> src/bin/select.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 | async fn main4() {
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/select.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |         transmit1.send(1);
[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] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 24 |         let _ = transmit1.send(1);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/select.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         transmit2.send(2);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let _ = transmit2.send(2);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/select.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 34 |     dbg!(result);
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let _ = dbg!(result);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0e9012787d7f45acc954220100ce9129b0771cc04fb93e17c80a55ec294b7528", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e9012787d7f45acc954220100ce9129b0771cc04fb93e17c80a55ec294b7528", kill_on_drop: false }`
[INFO] [stdout] 0e9012787d7f45acc954220100ce9129b0771cc04fb93e17c80a55ec294b7528