fix(async-io): return coro when __name__ is not present

Author: povilasv

CHANGELOG.md

@@ -55,6 +55,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#2420](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2420))
 - `opentelemetry-instrumentation-asyncio` Check for __name__ attribute in the coroutine
   ([#2521](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2521))
+- `opentelemetry-instrumentation-asyncio` Fix return coro when __name__ is not present
+  ([#2521](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2521))
 
 ## Version 1.24.0/0.45b0 (2024-03-28)
 

instrumentation/opentelemetry-instrumentation-asyncio/src/opentelemetry/instrumentation/asyncio/__init__.py

@@ -262,7 +262,7 @@ def trace_item(self, coro_or_future):
 
     async def trace_coroutine(self, coro):
         if not hasattr(coro, "__name__"):
-            return
+            return coro
         start = default_timer()
         attr = {
             "type": "coroutine",