[INFO] cloning repository https://github.com/zy97/modbus_demo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zy97/modbus_demo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzy97%2Fmodbus_demo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzy97%2Fmodbus_demo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f1a2f96998d346a172c6a3cde51cb406467135a5
[INFO] testing zy97/modbus_demo against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-7
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzy97%2Fmodbus_demo" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/zy97/modbus_demo
[INFO] finished tweaking git repo https://github.com/zy97/modbus_demo
[INFO] tweaked toml for git repo https://github.com/zy97/modbus_demo written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/zy97/modbus_demo on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 288 packages to latest compatible versions
[INFO] [stderr]       Adding opentelemetry v0.27.1 (available: v0.31.0)
[INFO] [stderr]       Adding opentelemetry-appender-tracing v0.27.0 (available: v0.31.1)
[INFO] [stderr]       Adding opentelemetry-otlp v0.27.0 (available: v0.31.0)
[INFO] [stderr]       Adding opentelemetry-semantic-conventions v0.27.0 (available: v0.31.0)
[INFO] [stderr]       Adding opentelemetry_sdk v0.27.1 (available: v0.31.0)
[INFO] [stderr]       Adding tokio-modbus v0.16.3 (available: v0.17.0)
[INFO] [stderr]       Adding tracing-opentelemetry v0.28.0 (available: v0.32.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mutually_exclusive_features v0.1.0
[INFO] [stderr]   Downloaded tracing-actix-web v0.7.19
[INFO] [stderr]   Downloaded bytestring v1.5.0
[INFO] [stderr]   Downloaded serde-untagged v0.1.9
[INFO] [stderr]   Downloaded nu-ansi-term v0.50.3
[INFO] [stderr]   Downloaded opentelemetry-appender-tracing v0.27.0
[INFO] [stderr]   Downloaded actix-rt v2.11.0
[INFO] [stderr]   Downloaded rust-ini v0.21.3
[INFO] [stderr]   Downloaded erased-serde v0.4.9
[INFO] [stderr]   Downloaded serde_spanned v1.0.3
[INFO] [stderr]   Downloaded opentelemetry-otlp v0.27.0
[INFO] [stderr]   Downloaded pest_generator v2.8.3
[INFO] [stderr]   Downloaded pest_derive v2.8.3
[INFO] [stderr]   Downloaded deadpool v0.12.3
[INFO] [stderr]   Downloaded opentelemetry v0.27.1
[INFO] [stderr]   Downloaded pest_meta v2.8.3
[INFO] [stderr]   Downloaded config v0.15.18
[INFO] [stderr]   Downloaded tonic v0.12.3
[INFO] [stderr]   Downloaded tokio-modbus v0.16.3
[INFO] [stderr]   Downloaded regex-lite v0.1.8
[INFO] [stderr]   Downloaded tracing-opentelemetry v0.28.0
[INFO] [stderr]   Downloaded opentelemetry-proto v0.27.0
[INFO] [stderr]   Downloaded actix-http v3.11.2
[INFO] [stderr]   Downloaded opentelemetry_sdk v0.27.1
[INFO] [stderr]   Downloaded tracing-bunyan-formatter v0.3.10
[INFO] [stderr]   Downloaded toml v0.9.8
[INFO] [stderr]   Downloaded yaml-rust2 v0.10.4
[INFO] [stderr]   Downloaded opentelemetry-semantic-conventions v0.27.0
[INFO] [stderr]   Downloaded zstd-sys v2.0.16+zstd.1.5.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8c96f03c687780dcc9a709d185163bc8a104338349c023fee6b9b0686ee8be45
[INFO] running `Command { std: "docker" "start" "-a" "8c96f03c687780dcc9a709d185163bc8a104338349c023fee6b9b0686ee8be45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c96f03c687780dcc9a709d185163bc8a104338349c023fee6b9b0686ee8be45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c96f03c687780dcc9a709d185163bc8a104338349c023fee6b9b0686ee8be45", kill_on_drop: false }`
[INFO] [stdout] 8c96f03c687780dcc9a709d185163bc8a104338349c023fee6b9b0686ee8be45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 90609bf7a5e264f69208250164d83d67b8a64e81d16929daf86291433efbf61f
[INFO] running `Command { std: "docker" "start" "-a" "90609bf7a5e264f69208250164d83d67b8a64e81d16929daf86291433efbf61f", kill_on_drop: false }`
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[INFO] [stderr]    Compiling gethostname v0.2.3
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[INFO] [stderr]    Compiling cookie v0.16.2
[INFO] [stderr]    Compiling num_cpus v1.17.0
[INFO] [stderr]    Compiling tracing-log v0.1.4
[INFO] [stderr]    Compiling rust-ini v0.21.3
[INFO] [stderr]    Compiling mutually_exclusive_features v0.1.0
[INFO] [stderr]    Compiling pathdiff v0.2.3
[INFO] [stderr]    Compiling deadpool-runtime v0.1.4
[INFO] [stderr]    Compiling opentelemetry-semantic-conventions v0.27.0
[INFO] [stderr]    Compiling actix-router v0.5.3
[INFO] [stderr]    Compiling matchers v0.2.0
[INFO] [stderr]    Compiling regex v1.12.2
[INFO] [stderr]    Compiling synstructure v0.13.2
[INFO] [stderr]    Compiling pest_generator v2.8.3
[INFO] [stderr]    Compiling tracing-attributes v0.1.30
[INFO] [stderr]    Compiling tokio-macros v2.6.0
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling zerovec-derive v0.11.2
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[INFO] [stderr]    Compiling async-trait v0.1.89
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling zerofrom-derive v0.1.6
[INFO] [stderr]    Compiling yoke-derive v0.8.1
[INFO] [stderr]    Compiling pin-project-internal v1.1.10
[INFO] [stderr]    Compiling derive_more-impl v2.0.1
[INFO] [stderr]    Compiling prost-derive v0.13.5
[INFO] [stderr]    Compiling tokio v1.48.0
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling async-stream-impl v0.3.6
[INFO] [stderr]    Compiling pest_derive v2.8.3
[INFO] [stderr]    Compiling pin-project v1.1.10
[INFO] [stderr]    Compiling thiserror-impl v2.0.17
[INFO] [stderr]    Compiling actix-macros v0.2.4
[INFO] [stderr]    Compiling actix-web-codegen v4.3.0
[INFO] [stderr]    Compiling zerofrom v0.1.6
[INFO] [stderr]    Compiling async-stream v0.3.6
[INFO] [stderr]    Compiling yoke v0.8.1
[INFO] [stderr]    Compiling zerovec v0.11.5
[INFO] [stderr]    Compiling zerotrie v0.2.3
[INFO] [stderr]    Compiling zstd-safe v7.2.4
[INFO] [stderr]    Compiling opentelemetry v0.27.1
[INFO] [stderr]    Compiling tracing-subscriber v0.3.20
[INFO] [stderr]    Compiling zstd v0.13.3
[INFO] [stderr]    Compiling prost v0.13.5
[INFO] [stderr]    Compiling derive_more v2.0.1
[INFO] [stderr]    Compiling tinystr v0.8.2
[INFO] [stderr]    Compiling potential_utf v0.1.4
[INFO] [stderr]    Compiling icu_collections v2.1.1
[INFO] [stderr]    Compiling icu_locale_core v2.1.1
[INFO] [stderr]    Compiling serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling ron v0.8.1
[INFO] [stderr]    Compiling json5 v0.4.1
[INFO] [stderr]    Compiling tracing-bunyan-formatter v0.3.10
[INFO] [stderr]    Compiling tracing-appender v0.2.3
[INFO] [stderr]    Compiling opentelemetry-appender-tracing v0.27.0
[INFO] [stderr]    Compiling icu_provider v2.1.1
[INFO] [stderr]    Compiling futures-executor v0.3.31
[INFO] [stderr]    Compiling tower v0.5.2
[INFO] [stderr]    Compiling axum-core v0.4.5
[INFO] [stderr]    Compiling icu_normalizer v2.1.1
[INFO] [stderr]    Compiling icu_properties v2.1.1
[INFO] [stderr]    Compiling config v0.15.18
[INFO] [stderr]    Compiling idna_adapter v1.2.1
[INFO] [stderr]    Compiling tokio-util v0.7.17
[INFO] [stderr]    Compiling tokio-stream v0.1.17
[INFO] [stderr]    Compiling actix-rt v2.11.0
[INFO] [stderr]    Compiling deadpool v0.12.3
[INFO] [stderr]    Compiling idna v1.1.0
[INFO] [stderr]    Compiling url v2.5.7
[INFO] [stderr]    Compiling opentelemetry_sdk v0.27.1
[INFO] [stderr]    Compiling actix-server v2.6.0
[INFO] [stderr]    Compiling h2 v0.4.12
[INFO] [stderr]    Compiling tower v0.4.13
[INFO] [stderr]    Compiling h2 v0.3.27
[INFO] [stderr]    Compiling actix-codec v0.5.2
[INFO] [stderr]    Compiling tokio-modbus v0.16.3
[INFO] [stderr]    Compiling axum v0.7.9
[INFO] [stderr]    Compiling tracing-opentelemetry v0.28.0
[INFO] [stderr]    Compiling actix-http v3.11.2
[INFO] [stderr]    Compiling hyper v1.7.0
[INFO] [stderr]    Compiling hyper-util v0.1.17
[INFO] [stderr]    Compiling actix-web v4.11.0
[INFO] [stderr]    Compiling hyper-timeout v0.5.2
[INFO] [stderr]    Compiling tonic v0.12.3
[INFO] [stderr]    Compiling opentelemetry-proto v0.27.0
[INFO] [stderr]    Compiling tracing-actix-web v0.7.19
[INFO] [stderr]    Compiling opentelemetry-otlp v0.27.0
[INFO] [stderr]    Compiling modbus v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `info`
[INFO] [stdout]  --> src/modbus_manager.rs:6:29
[INFO] [stdout]   |
[INFO] [stdout] 6 | use tracing::{debug, error, info};
[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: `Manager`
[INFO] [stdout]  --> src/server_router.rs:9:25
[INFO] [stdout]   |
[INFO] [stdout] 9 | use deadpool::managed::{Manager, Object};
[INFO] [stdout]   |                         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::time::error::Elapsed`
[INFO] [stdout]   --> src/server_router.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use tokio::time::error::Elapsed;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio_modbus::client::Client`
[INFO] [stdout]   --> src/server_router.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use tokio_modbus::client::Client;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ExceptionCode`
[INFO] [stdout]   --> src/server_router.rs:13:36
[INFO] [stdout]    |
[INFO] [stdout] 13 | use tokio_modbus::{client::Reader, ExceptionCode};
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `info`
[INFO] [stdout]   --> src/server_router.rs:14:22
[INFO] [stdout]    |
[INFO] [stdout] 14 | use tracing::{error, info};
[INFO] [stdout]    |                      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tracing::info`
[INFO] [stdout]   --> src/trace_middleware.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use tracing::info;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `actix_web::dev::Service`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use actix_web::dev::Service;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `actix_web::middleware::from_fn`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use actix_web::middleware::from_fn;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ObjectSafeTracerProvider`
[INFO] [stdout]   --> src/main.rs:12:35
[INFO] [stdout]    |
[INFO] [stdout] 12 | use opentelemetry::global::{self, ObjectSafeTracerProvider};
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `opentelemetry::KeyValue`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use opentelemetry::KeyValue;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `opentelemetry_otlp::WithExportConfig`
[INFO] [stdout]   --> src/main.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use opentelemetry_otlp::WithExportConfig;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `opentelemetry_sdk::logs::LoggerProvider`
[INFO] [stdout]   --> src/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use opentelemetry_sdk::logs::LoggerProvider;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Resource`, `runtime::TokioCurrentThread`, and `trace::Config`
[INFO] [stdout]   --> src/main.rs:19:42
[INFO] [stdout]    |
[INFO] [stdout] 19 |     propagation::TraceContextPropagator, runtime::TokioCurrentThread, trace::Config, Resource,
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `opentelemetry_semantic_conventions::resource`
[INFO] [stdout]   --> src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use opentelemetry_semantic_conventions::resource;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SERVICE_NAME`
[INFO] [stdout]   --> src/main.rs:22:36
[INFO] [stdout]    |
[INFO] [stdout] 22 | use otlp::{init_logs, init_traces, SERVICE_NAME};
[INFO] [stdout]    |                                    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Error`
[INFO] [stdout]   --> src/main.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | use std::fmt::Error;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `trace_middleware::trace_middleware`
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | use trace_middleware::trace_middleware;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Registry`
[INFO] [stdout]   --> src/main.rs:33:59
[INFO] [stdout]    |
[INFO] [stdout] 33 | use tracing_subscriber::{layer::SubscriberExt, EnvFilter, Registry};
[INFO] [stdout]    |                                                           ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `tokio_modbus::client::Context` doesn't implement `std::fmt::Debug`
[INFO] [stdout]   --> src/modbus_manager.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | #[derive(Debug)]
[INFO] [stdout]    |          ----- in this derive macro expansion
[INFO] [stdout] ...
[INFO] [stdout] 17 |     pub context: Context,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^ the trait `std::fmt::Debug` is not implemented for `tokio_modbus::client::Context`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures_util::FutureExt`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use futures_util::FutureExt as _;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tracer_provider`
[INFO] [stdout]   --> src/main.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let tracer_provider = init_traces().unwrap();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_tracer_provider`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `modbus` (bin "modbus") due to 1 previous error; 21 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "90609bf7a5e264f69208250164d83d67b8a64e81d16929daf86291433efbf61f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90609bf7a5e264f69208250164d83d67b8a64e81d16929daf86291433efbf61f", kill_on_drop: false }`
[INFO] [stdout] 90609bf7a5e264f69208250164d83d67b8a64e81d16929daf86291433efbf61f
