[INFO] cloning repository https://github.com/cwczyj/roboplc-middle
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cwczyj/roboplc-middle" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcwczyj%2Froboplc-middle", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcwczyj%2Froboplc-middle'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bc9ea56dbec88bdc1848c1e19e1f363535d02b6a
[INFO] checking cwczyj/roboplc-middle against master#c290daa1e5274a52e54a0f49e31bd70192abc606 for pr-133502-23
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcwczyj%2Froboplc-middle" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/cwczyj/roboplc-middle
[INFO] finished tweaking git repo https://github.com/cwczyj/roboplc-middle
[INFO] tweaked toml for git repo https://github.com/cwczyj/roboplc-middle written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/cwczyj/roboplc-middle on toolchain c290daa1e5274a52e54a0f49e31bd70192abc606
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c290daa1e5274a52e54a0f49e31bd70192abc606" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/cwczyj/roboplc-middle 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" "+c290daa1e5274a52e54a0f49e31bd70192abc606" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:3d5ced03c013a94a2f102a4510f48a6e9184255caf5fd8244f58017bde7f5210" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 642276d993dd666612591a351053e1fcd552f0439ba3bfbe2eeb30d8b1caf114
[INFO] running `Command { std: "docker" "start" "642276d993dd666612591a351053e1fcd552f0439ba3bfbe2eeb30d8b1caf114", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "642276d993dd666612591a351053e1fcd552f0439ba3bfbe2eeb30d8b1caf114", 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" "642276d993dd666612591a351053e1fcd552f0439ba3bfbe2eeb30d8b1caf114" "/opt/rustwide/cargo-home/bin/cargo" "+c290daa1e5274a52e54a0f49e31bd70192abc606" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "642276d993dd666612591a351053e1fcd552f0439ba3bfbe2eeb30d8b1caf114", 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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "642276d993dd666612591a351053e1fcd552f0439ba3bfbe2eeb30d8b1caf114" "/opt/rustwide/cargo-home/bin/cargo" "+c290daa1e5274a52e54a0f49e31bd70192abc606" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> src/workers/rpc/worker.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `RegisterType`
[INFO] [stdout]    --> src/workers/modbus/worker.rs:159:58
[INFO] [stdout]     |
[INFO] [stdout] 159 |     use crate::workers::modbus::{parse_register_address, RegisterType};
[INFO] [stdout]     |                                                          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]    --> src/lib.rs:418:9
[INFO] [stdout]     |
[INFO] [stdout] 418 |     use std::time::Duration;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `transaction_id`
[INFO] [stdout]    --> src/workers/modbus/client.rs:660:9
[INFO] [stdout]     |
[INFO] [stdout] 660 |         transaction_id: Option<u16>,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_transaction_id`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `AtomicU16`
[INFO] [stdout]   --> tests/mock_modbus.rs:10:37
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::sync::atomic::{AtomicBool, AtomicU16, Ordering};
[INFO] [stdout]    |                                     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `response_tx`
[INFO] [stdout]   --> tests/hub_deadlock_tests.rs:71:10
[INFO] [stdout]    |
[INFO] [stdout] 71 |     let (response_tx, response_rx) = sync_channel::<String>(1);
[INFO] [stdout]    |          ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_response_tx`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `AtomicU16`
[INFO] [stdout]   --> tests/mock_modbus.rs:10:37
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::sync::atomic::{AtomicBool, AtomicU16, Ordering};
[INFO] [stdout]    |                                     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ILLEGAL_DATA_ADDRESS` is never used
[INFO] [stdout]   --> demo/mock_server.rs:32:15
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub const ILLEGAL_DATA_ADDRESS: u8 = 0x02;
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `SERVER_DEVICE_FAILURE` is never used
[INFO] [stdout]   --> demo/mock_server.rs:34:15
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub const SERVER_DEVICE_FAILURE: u8 = 0x04;
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `wait_result`
[INFO] [stdout]   --> tests/rpc_shutdown_tests.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let wait_result = thread::spawn(|| handle.join());
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_wait_result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `DIAGNOSTICS` is never used
[INFO] [stdout]   --> tests/mock_modbus.rs:24:15
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub const DIAGNOSTICS: u8 = 0x08;
[INFO] [stdout]    |               ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ILLEGAL_DATA_ADDRESS` is never used
[INFO] [stdout]   --> tests/mock_modbus.rs:30:15
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub const ILLEGAL_DATA_ADDRESS: u8 = 0x02;
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> demo/jsonrpc_client.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct JsonRpcResponse {
[INFO] [stdout]    |        --------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 36 |     id: u64,
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `JsonRpcResponse` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> demo/jsonrpc_client.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct JsonRpcResponse {
[INFO] [stdout]    |        --------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 36 |     id: u64,
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `JsonRpcResponse` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_mock_response` is never used
[INFO] [stdout]    --> tests/async_rpc_tests.rs:463:4
[INFO] [stdout]     |
[INFO] [stdout] 463 | fn create_mock_response(success: bool, data: serde_json::Value) -> DeviceResponseData {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_mock_error_response` is never used
[INFO] [stdout]    --> tests/async_rpc_tests.rs:468:4
[INFO] [stdout]     |
[INFO] [stdout] 468 | fn create_mock_error_response(error: &str) -> DeviceResponseData {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::path::PathBuf`
[INFO] [stdout]  --> tests/integration_tests.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::path::PathBuf;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> tests/integration_tests.rs:245:9
[INFO] [stdout]     |
[INFO] [stdout] 245 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/integration_tests.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let mut temp_file = tempfile::NamedTempFile::new().unwrap();
[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: constant `ILLEGAL_DATA_ADDRESS` is never used
[INFO] [stdout]   --> demo/mock_server.rs:32:15
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub const ILLEGAL_DATA_ADDRESS: u8 = 0x02;
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `SERVER_DEVICE_FAILURE` is never used
[INFO] [stdout]   --> demo/mock_server.rs:34:15
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub const SERVER_DEVICE_FAILURE: u8 = 0x04;
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> tests/mock_modbus.rs:152:12
[INFO] [stdout]     |
[INFO] [stdout] 114 | impl MockModbusServer {
[INFO] [stdout]     | --------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 152 |     pub fn address(&self) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 171 |     pub fn set_holding_registers(&self, start: u16, values: &[u16]) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 185 |     pub fn set_input_register(&self, address: u16, value: u16) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 191 |     pub fn set_coil(&self, address: u16, value: bool) {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 197 |     pub fn set_discrete_input(&self, address: u16, value: bool) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 209 |     pub fn fail_next_request(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 215 |     pub fn reset(&self) {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `DIAGNOSTICS` is never used
[INFO] [stdout]   --> tests/mock_modbus.rs:24:15
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub const DIAGNOSTICS: u8 = 0x08;
[INFO] [stdout]    |               ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ILLEGAL_DATA_ADDRESS` is never used
[INFO] [stdout]   --> tests/mock_modbus.rs:30:15
[INFO] [stdout]    |
[INFO] [stdout] 30 |     pub const ILLEGAL_DATA_ADDRESS: u8 = 0x02;
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `transaction_id`
[INFO] [stdout]    --> src/workers/modbus/client.rs:660:9
[INFO] [stdout]     |
[INFO] [stdout] 660 |         transaction_id: Option<u16>,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_transaction_id`
[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/workers/modbus/client.rs:914:13
[INFO] [stdout]     |
[INFO] [stdout] 914 |         let mut pool = ModbusConnectionPool::new(
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/workers/modbus/client.rs:926:13
[INFO] [stdout]     |
[INFO] [stdout] 926 |         let mut pool = ModbusConnectionPool::new(
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/workers/modbus/client.rs:943:13
[INFO] [stdout]     |
[INFO] [stdout] 943 |         let mut pool = ModbusConnectionPool::new(
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/workers/modbus/client.rs:962:13
[INFO] [stdout]     |
[INFO] [stdout] 962 |         let mut pool = ModbusConnectionPool::new(
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/workers/modbus/client.rs:990:13
[INFO] [stdout]     |
[INFO] [stdout] 990 |         let mut pool = ModbusConnectionPool::new(
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/workers/modbus/client.rs:1006:13
[INFO] [stdout]      |
[INFO] [stdout] 1006 |         let mut pool = ModbusConnectionPool::new(
[INFO] [stdout]      |             ----^^^^
[INFO] [stdout]      |             |
[INFO] [stdout]      |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/workers/modbus/client.rs:1032:13
[INFO] [stdout]      |
[INFO] [stdout] 1032 |         let mut pool = ModbusConnectionPool::new(
[INFO] [stdout]      |             ----^^^^
[INFO] [stdout]      |             |
[INFO] [stdout]      |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/workers/modbus/types.rs:331:9
[INFO] [stdout]     |
[INFO] [stdout] 329 |     struct TestOperation {
[INFO] [stdout]     |            ------------- field in this struct
[INFO] [stdout] 330 |         id: u32,
[INFO] [stdout] 331 |         data: i32,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `TestOperation` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/workers/http_worker.rs:932:9
[INFO] [stdout]     |
[INFO] [stdout] 932 |         registry.register(conn1);
[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] 932 |         let _ = registry.register(conn1);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/workers/http_worker.rs:941:9
[INFO] [stdout]     |
[INFO] [stdout] 941 |         registry.register(conn2);
[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] 941 |         let _ = registry.register(conn2);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/workers/http_worker.rs:950:9
[INFO] [stdout]     |
[INFO] [stdout] 950 |         registry.register(conn3);
[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] 950 |         let _ = registry.register(conn3);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/workers/sse_worker.rs:558:17
[INFO] [stdout]     |
[INFO] [stdout] 558 |                 registry_clone.register(conn);
[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] 558 |                 let _ = registry_clone.register(conn);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 38s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: binrw v0.14.1
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "642276d993dd666612591a351053e1fcd552f0439ba3bfbe2eeb30d8b1caf114", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "642276d993dd666612591a351053e1fcd552f0439ba3bfbe2eeb30d8b1caf114", kill_on_drop: false }`
[INFO] [stdout] 642276d993dd666612591a351053e1fcd552f0439ba3bfbe2eeb30d8b1caf114
