Deno panics while serving otel example

[zachauten]

Running the example from the Deno.telemetry docs.

main.ts:

import { trace } from "npm:@opentelemetry/api@1";
import "jsr:@deno/otel@0.0.2/register";

const tracer = trace.getTracer("example-tracer");

async function doWork() {
  return tracer.startActiveSpan("doWork", async (span) => {
    span.setAttribute("key", "value");
    await new Promise((resolve) => setTimeout(resolve, 1000));
    span.end();
  });
}

Deno.serve(async (req) => {
  await doWork();
  const resp = await fetch("https://example.com");
  return resp;
});

bash script that sets env variables and runs the server:

export OTEL_SERVICE_NAME=my-service-name
export OTEL_EXPORTER_OTLP_ENDPOINT="https://api.honeycomb.io"
export OTEL_EXPORTER_OTLP_HEADERS="x-honeycomb-team=***"
export RUST_BACKTRACE=full
deno run --unstable-otel -A main.ts

Backtrace:

Listening on http://0.0.0.0:8000/

============================================================
Deno has panicked. This is a bug in Deno. Please report this
at https://github.com/denoland/deno/issues/new.
If you can reliably reproduce this panic, include the
reproduction steps and re-run with the RUST_BACKTRACE=1 env
var set and include the backtrace in your report.

Platform: linux x86_64
Version: 2.1.2
Args: ["deno", "run", "--unstable-otel", "-A", "main.ts"]

thread 'main' panicked at ext/telemetry/lib.rs:638:42:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0:     0x55dba96fe921 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h9754a6437f1de22a
   1:     0x55dba81d5a5b - core::fmt::write::hb706a393bb60a06f
   2:     0x55dba9702088 - std::io::Write::write_fmt::h9b447dc5d824d0bd
   3:     0x55dba9735153 - std::panicking::default_hook::{{closure}}::h227952daede9dd84
   4:     0x55dba9734e54 - std::panicking::default_hook::h31626ee1feb8ee2a
   5:     0x55dba810784e - deno::setup_panic_hook::{{closure}}::he901c578798dbf08
   6:     0x55dba9735b99 - std::panicking::rust_panic_with_hook::h76d2aa694a00748e
   7:     0x55dba96fed42 - std::panicking::begin_panic_handler::{{closure}}::h8855a344ffa1638b
   8:     0x55dba96fecd9 - std::sys::backtrace::__rust_end_short_backtrace::h3110d0cbfbf26886
   9:     0x55dba9735584 - rust_begin_unwind
  10:     0x55dba7a1f522 - core::panicking::panic_fmt::h3af706d0346c1c60
  11:     0x55dba7a1f4eb - core::panicking::panic::h8fa9c73fac331fdb
  12:     0x55dba7a1f4a8 - core::option::unwrap_failed::had2d05111e3e145c
  13:     0x55dba8f83f4e - deno_telemetry::op_otel_instrumentation_scope_enter_builtin::op_otel_instrumentation_scope_enter_builtin::v8_fn_ptr::hcd9ad9072700e39b
  14:     0x55db4a2cf1c6 - <unknown>