[INFO] cloning repository https://github.com/ac999/round_robin_loadbalancer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ac999/round_robin_loadbalancer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fac999%2Fround_robin_loadbalancer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fac999%2Fround_robin_loadbalancer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b13405fa9e7eb2384a7242a25a3a138c394ace3f
[INFO] testing ac999/round_robin_loadbalancer against 1.99.0-beta.8 for beta-1.100-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fac999%2Fround_robin_loadbalancer" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ac999/round_robin_loadbalancer
[INFO] finished tweaking git repo https://github.com/ac999/round_robin_loadbalancer
[INFO] tweaked toml for git repo https://github.com/ac999/round_robin_loadbalancer written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ac999/round_robin_loadbalancer on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ac999/round_robin_loadbalancer 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" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[INFO] [stderr]   Downloaded tokio-macros v1.3.0
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:3111399a4047eeb3a02b7a90e478d715f38a8c6669b5c4b49d30a17385265909" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1
[INFO] running `Command { std: "docker" "start" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1", 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" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1", 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" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.99
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
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[INFO] [stderr]    Compiling memchr v2.4.0
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[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling futures-channel v0.3.16
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]    Compiling futures-task v0.3.16
[INFO] [stderr]    Compiling futures-sink v0.3.16
[INFO] [stderr]    Compiling pin-project-lite v0.2.7
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling instant v0.1.10
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling cc v1.0.69
[INFO] [stderr]    Compiling futures-io v0.3.16
[INFO] [stderr]    Compiling slab v0.4.4
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling bitflags v1.3.1
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]    Compiling futures-macro v0.3.16
[INFO] [stderr]    Compiling futures-util v0.3.16
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling tokio v1.10.0
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling once_cell v1.8.0
[INFO] [stderr]    Compiling bytes v1.0.1
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling mio v0.7.13
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling rlua v0.17.0
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling tokio-macros v1.3.0
[INFO] [stderr]    Compiling futures-executor v0.3.16
[INFO] [stderr]    Compiling futures v0.3.16
[INFO] [stderr]    Compiling multithreadluaexec v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `tokio::sync::mpsc::Sender`
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use tokio::sync::mpsc::Sender;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/load_balancer.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut worker = &self.pool[worker_nr];
[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: `i`
[INFO] [stdout]  --> src/load_balancer.rs:9:13
[INFO] [stdout]   |
[INFO] [stdout] 9 |         for i in 0..num {
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[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/main.rs:33:18
[INFO] [stdout]    |
[INFO] [stdout] 33 |         let (tx, mut rx) = mpsc::channel(100);
[INFO] [stdout]    |                  ----^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lua`
[INFO] [stdout]   --> src/main.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let lua: Lua = Lua::new();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_lua`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rx`
[INFO] [stdout]   --> src/main.rs:33:18
[INFO] [stdout]    |
[INFO] [stdout] 33 |         let (tx, mut rx) = mpsc::channel(100);
[INFO] [stdout]    |                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_rx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `int_result` and `string_result` are never read
[INFO] [stdout]   --> src/types.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct LuaResult {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] 12 |     pub int_result: Option<i64>,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 13 |     pub string_result: Option<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `server` is never read
[INFO] [stdout]   --> src/types.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub struct Worker {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 17 |     pub sender: Sender<(LuaCode, Sender<LuaResult>)>,
[INFO] [stdout] 18 |     pub server: JoinHandle<u32>,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/worker.rs:20:29
[INFO] [stdout]    |
[INFO] [stdout] 20 | / ...                   res.clone()
[INFO] [stdout] 21 | | ...                       .send(LuaResult { int_result: Some(0), string_result: Some("0".to_string()) })
[INFO] [stdout] 22 | | ...                       .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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 20 |                             let _ = res.clone()
[INFO] [stdout]    |                             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/worker.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         self.sender.clone().send(res).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] 32 |         let _ = self.sender.clone().send(res).await;
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.26s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rlua v0.17.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 7`
[INFO] running `Command { std: "docker" "inspect" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1", 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" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling multithreadluaexec v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `tokio::sync::mpsc::Sender`
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use tokio::sync::mpsc::Sender;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/load_balancer.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let mut worker = &self.pool[worker_nr];
[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: `i`
[INFO] [stdout]  --> src/load_balancer.rs:9:13
[INFO] [stdout]   |
[INFO] [stdout] 9 |         for i in 0..num {
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[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/main.rs:33:18
[INFO] [stdout]    |
[INFO] [stdout] 33 |         let (tx, mut rx) = mpsc::channel(100);
[INFO] [stdout]    |                  ----^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lua`
[INFO] [stdout]   --> src/main.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let lua: Lua = Lua::new();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_lua`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rx`
[INFO] [stdout]   --> src/main.rs:33:18
[INFO] [stdout]    |
[INFO] [stdout] 33 |         let (tx, mut rx) = mpsc::channel(100);
[INFO] [stdout]    |                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_rx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `int_result` and `string_result` are never read
[INFO] [stdout]   --> src/types.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct LuaResult {
[INFO] [stdout]    |            --------- fields in this struct
[INFO] [stdout] 12 |     pub int_result: Option<i64>,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 13 |     pub string_result: Option<String>,
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `server` is never read
[INFO] [stdout]   --> src/types.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub struct Worker {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 17 |     pub sender: Sender<(LuaCode, Sender<LuaResult>)>,
[INFO] [stdout] 18 |     pub server: JoinHandle<u32>,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/worker.rs:20:29
[INFO] [stdout]    |
[INFO] [stdout] 20 | / ...                   res.clone()
[INFO] [stdout] 21 | | ...                       .send(LuaResult { int_result: Some(0), string_result: Some("0".to_string()) })
[INFO] [stdout] 22 | | ...                       .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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 20 |                             let _ = res.clone()
[INFO] [stdout]    |                             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/worker.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         self.sender.clone().send(res).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] 32 |         let _ = self.sender.clone().send(res).await;
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.39s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rlua v0.17.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 7`
[INFO] running `Command { std: "docker" "inspect" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1", 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" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `tokio::sync::mpsc::Sender`
[INFO] [stderr]   --> src/main.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 | use tokio::sync::mpsc::Sender;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/load_balancer.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |         let mut worker = &self.pool[worker_nr];
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]  --> src/load_balancer.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |         for i in 0..num {
[INFO] [stderr]   |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:33:18
[INFO] [stderr]    |
[INFO] [stderr] 33 |         let (tx, mut rx) = mpsc::channel(100);
[INFO] [stderr]    |                  ----^^
[INFO] [stderr]    |                  |
[INFO] [stderr]    |                  help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `lua`
[INFO] [stderr]   --> src/main.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let lua: Lua = Lua::new();
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_lua`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rx`
[INFO] [stderr]   --> src/main.rs:33:18
[INFO] [stderr]    |
[INFO] [stderr] 33 |         let (tx, mut rx) = mpsc::channel(100);
[INFO] [stderr]    |                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_rx`
[INFO] [stderr] 
[INFO] [stderr] warning: fields `int_result` and `string_result` are never read
[INFO] [stderr]   --> src/types.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub struct LuaResult {
[INFO] [stderr]    |            --------- fields in this struct
[INFO] [stderr] 12 |     pub int_result: Option<i64>,
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr] 13 |     pub string_result: Option<String>,
[INFO] [stderr]    |         ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field `server` is never read
[INFO] [stderr]   --> src/types.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 16 | pub struct Worker {
[INFO] [stderr]    |            ------ field in this struct
[INFO] [stderr] 17 |     pub sender: Sender<(LuaCode, Sender<LuaResult>)>,
[INFO] [stderr] 18 |     pub server: JoinHandle<u32>,
[INFO] [stderr]    |         ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/worker.rs:20:29
[INFO] [stderr]    |
[INFO] [stderr] 20 | / ...                   res.clone()
[INFO] [stderr] 21 | | ...                       .send(LuaResult { int_result: Some(0), string_result: Some("0".to_string()) })
[INFO] [stderr] 22 | | ...                       .await;
[INFO] [stderr]    | |________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 20 |                             let _ = res.clone()
[INFO] [stderr]    |                             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/worker.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |         self.sender.clone().send(res).await;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 32 |         let _ = self.sender.clone().send(res).await;
[INFO] [stderr]    |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `multithreadluaexec` (bin "multithreadluaexec" test) generated 10 warnings (run `cargo fix --bin "multithreadluaexec" -p multithreadluaexec --tests` to apply 6 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rlua v0.17.0
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 7`
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/multithreadluaexec-99efbe7f83f39db0)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1", kill_on_drop: false }`
[INFO] [stdout] 05c0d29aba01828c5cf769919566bdaf8d01dff830269407461410ca5bdc65e1
