Retracted the TaskInfo type annotation changes

docs/versionhistory.rst

@@ -5,11 +5,7 @@ This library adheres to `Semantic Versioning 2.0 <http://semver.org/>`_.
 
 **UNRELEASED**
 
-- Improved compatibility with asyncio's eager task factories:
-
-  * Updated the annotation of ``TaskInfo.coro`` to allow it to be ``None``
-  * Updated ``TaskGroup`` to work with asyncio eager task factories
-
+- Updated ``TaskGroup`` to work with asyncio's eager task factories
   (`#764 <https://github.com/agronholm/anyio/issues/764>`_)
 - Fixed a misleading ``ValueError`` in the context of DNS failures
   (`#815 <https://github.com/agronholm/anyio/issues/815>`_; PR by @graingert)

src/anyio/_backends/_asyncio.py

@@ -2142,7 +2142,9 @@ def __init__(self, task: asyncio.Task):
         else:
             parent_id = task_state.parent_id
 
-        super().__init__(id(task), parent_id, task.get_name(), task.get_coro())
+        coro = task.get_coro()
+        assert coro is not None, "created TaskInfo from a completed Task"
+        super().__init__(id(task), parent_id, task.get_name(), coro)
         self._task = weakref.ref(task)
 
     def has_pending_cancellation(self) -> bool:

src/anyio/_core/_testing.py

@@ -24,14 +24,14 @@ def __init__(
         id: int,
         parent_id: int | None,
         name: str | None,
-        coro: Generator[Any, Any, Any] | Awaitable[Any] | None,
+        coro: Generator[Any, Any, Any] | Awaitable[Any],
     ):
         func = get_current_task
         self._name = f"{func.__module__}.{func.__qualname__}"
         self.id: int = id
         self.parent_id: int | None = parent_id
         self.name: str | None = name
-        self.coro: Generator[Any, Any, Any] | Awaitable[Any] | None = coro
+        self.coro: Generator[Any, Any, Any] | Awaitable[Any] = coro
 
     def __eq__(self, other: object) -> bool:
         if isinstance(other, TaskInfo):