Always raise asyncio errors

tractor/to_asyncio.py

@@ -158,28 +158,15 @@ async def run_task(
         with cs:
             return await from_aio.receive()
 
-        if cs.cancelled_caught:
-            # always raise from any captured asyncio error
-            if from_aio._err:
-                raise from_aio._err
-
-    # Do we need this?
-    except Exception as err:
-
-        aio_err = from_aio._err
-
-        if aio_err is not None:
-            # always raise from any captured asyncio error
-            raise err from aio_err
-        else:
-            raise
-
     except trio.Cancelled:
         if not task.done():
             task.cancel()
-
         raise
 
+    finally:
+        if from_aio._err:
+            raise from_aio._err
+
 
 # TODO: explicit api for the streaming case where
 # we pull from the mem chan in an async generator?