Employ asyncio.Runner in the asyncio REPL

Author: johnslavik

Lib/asyncio/__main__.py

@@ -187,8 +187,8 @@ def interrupt(self) -> None:
         from _pyrepl.main import CAN_USE_PYREPL
 
     return_code = 0
-    loop = asyncio.new_event_loop()
-    asyncio.set_event_loop(loop)
+    runner = asyncio.Runner()
+    loop = runner.get_loop()
 
     repl_locals = {'asyncio': asyncio}
     for key in {'__name__', '__package__',
@@ -240,4 +240,5 @@ def interrupt(self) -> None:
             break
 
     console.write('exiting asyncio REPL...\n')
+    runner.close()
     sys.exit(return_code)