Opentelemtry v0.23 causes example code to crash

[lmtr0]

Hi there,
using the default code presented in the repo:

use opentelemetry::trace::{TracerProvider as _};
use opentelemetry::KeyValue;
use opentelemetry_sdk::trace::{TracerProvider};
use opentelemetry_stdout as stdout;
use tracing::{error, span};
use tracing_subscriber::layer::SubscriberExt;
use tracing_subscriber::{Registry};

fn main() {
    // Create a new OpenTelemetry trace pipeline that prints to stdout
    let provider = TracerProvider::builder()
        .with_simple_exporter(stdout::SpanExporter::default())
        .build();
    let tracer = provider
        .tracer_builder("my_library")
        .with_version(env!("CARGO_PKG_VERSION"))
        .with_schema_url("https://opentelemetry.io/schema/1.0.0")
        .with_attributes(vec![KeyValue::new("key", "value")])
        .build();
    // Create a tracing layer with the configured tracer
    let telemetry = tracing_opentelemetry::OpenTelemetryLayer::new(tracer);

    // Use the tracing subscriber `Registry`, or any other subscriber
    // that impls `LookupSpan`
    let subscriber = Registry::default().with(telemetry);

    // Trace executed code
    tracing::subscriber::with_default(subscriber, || {
        // Spans will be sent to the configured OpenTelemetry exporter
        let root = span!(tracing::Level::TRACE, "app_start", work_units = 2);
        let _enter = root.enter();

        error!("This event will be logged in the root span.");
    });
}

with these dependencies versions:

[dependencies]
# Telemetry
opentelemetry = { version = "0.23", features = ["trace", "metrics"] }
opentelemetry_sdk = { version = "0.23", features = ["trace", "metrics"] }
opentelemetry-stdout = { version = "0.4", features = ["trace", "metrics"] }

tracing = "0.1"
tracing-opentelemetry = { version = "0.23", features = ["metrics"] }
tracing-subscriber = "0.3"

Causes this error:

error[E0277]: the trait bound `opentelemetry_sdk::trace::Tracer: opentelemetry::trace::tracer::Tracer` is not satisfied
   --> Source/email_templated/src/main.rs:21:64
    |
21  |     let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
    |                                                    ----------- ^^^^^^ the trait `opentelemetry::trace::tracer::Tracer` is not implemented for `opentelemetry_sdk::trace::Tracer`
    |                                                    |
    |                                                    required by a bound introduced by this call
    |
    = help: the following other types implement trait `opentelemetry::trace::tracer::Tracer`:
              opentelemetry::global::trace::BoxedTracer
              opentelemetry::trace::noop::NoopTracer
              opentelemetry_sdk::trace::tracer::Tracer
note: required by a bound in `OpenTelemetryLayer::<S, T>::with_tracer`
   --> /home/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tracing-opentelemetry-0.23.0/src/layer.rs:581:17
    |
579 |     pub fn with_tracer<Tracer>(self, tracer: Tracer) -> OpenTelemetryLayer<S, Tracer>
    |            ----------- required by a bound in this associated function
580 |     where
581 |         Tracer: otel::Tracer + PreSampledTracer + 'static,
    |                 ^^^^^^^^^^^^ required by this bound in `OpenTelemetryLayer::<S, T>::with_tracer`

error[E0277]: the trait bound `opentelemetry_sdk::trace::Tracer: PreSampledTracer` is not satisfied
   --> Source/email_templated/src/main.rs:21:64
    |
21  |     let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
    |                                                    ----------- ^^^^^^ the trait `PreSampledTracer` is not implemented for `opentelemetry_sdk::trace::Tracer`
    |                                                    |
    |                                                    required by a bound introduced by this call
    |
    = help: the following other types implement trait `PreSampledTracer`:
              opentelemetry::trace::noop::NoopTracer
              opentelemetry_sdk::trace::tracer::Tracer
note: required by a bound in `OpenTelemetryLayer::<S, T>::with_tracer`
   --> /home/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tracing-opentelemetry-0.23.0/src/layer.rs:581:32
    |
579 |     pub fn with_tracer<Tracer>(self, tracer: Tracer) -> OpenTelemetryLayer<S, Tracer>
    |            ----------- required by a bound in this associated function
580 |     where
581 |         Tracer: otel::Tracer + PreSampledTracer + 'static,
    |                                ^^^^^^^^^^^^^^^^ required by this bound in `OpenTelemetryLayer::<S, T>::with_tracer`

For more information about this error, try `rustc --explain E0277`.
warning: `email_templated` (bin "email_templated") generated 2 warnings
error: could not compile `email_templated` (bin "email_templated") due to 2 previous errors; 2 warnings emitted
> cargo run
   Compiling email_templated v0.1.0 (/home/me/repo/warpfactor/workers/Source/email_templated)
error[E0283]: type annotations needed for `OpenTelemetryLayer<Registry, T>`
   --> Source/email_templated/src/main.rs:21:9
    |
21  |     let telemetry = tracing_opentelemetry::OpenTelemetryLayer::new(tracer.into());
    |         ^^^^^^^^^   ---------------------------------------------- ------------- type must be known at this point
    |                     |
    |                     required by a bound introduced by this call
    |
    = note: cannot satisfy `_: opentelemetry::trace::tracer::Tracer`
    = help: the following types implement trait `opentelemetry::trace::tracer::Tracer`:
              opentelemetry::global::trace::BoxedTracer
              opentelemetry::trace::noop::NoopTracer
              opentelemetry_sdk::trace::tracer::Tracer
note: required by a bound in `OpenTelemetryLayer::<S, T>::new`
   --> /home/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tracing-opentelemetry-0.23.0/src/layer.rs:506:8
    |
506 |     T: otel::Tracer + PreSampledTracer + 'static,
    |        ^^^^^^^^^^^^ required by this bound in `OpenTelemetryLayer::<S, T>::new`
...
535 |     pub fn new(tracer: T) -> Self {
    |            --- required by a bound in this associated function
help: consider giving `telemetry` an explicit type, where the type for type parameter `T` is specified
    |
21  |     let telemetry: OpenTelemetryLayer<Registry, T> = tracing_opentelemetry::OpenTelemetryLayer::new(tracer.into());
    |                  +++++++++++++++++++++++++++++++++

For more information about this error, try `rustc --explain E0283`.
error: could not compile `email_templated` (bin "email_templated") due to 1 previous error

This error does not happen when using open telemetry v0.22 of the tracing-opentelemtry crate

[lalitb]

Refer - open-telemetry/opentelemetry-rust#1779 (comment) if that answers the question.

[lmtr0]

thx