Add type information for asyncio.events.AbstractServer

Add the appropriate types for AbstractServer in asyncio.events. wait_closed() is
a couroutine, however in the implementation of AbstractServer not marked
as such. We are adding the couroutine defintion here anyway, as we do want
to make it typeable as a coroutine if necessary.

stdlib/3.4/asyncio/__init__.pyi

@@ -19,6 +19,7 @@ from asyncio.tasks import (
 from asyncio.events import (
     AbstractEventLoopPolicy as AbstractEventLoopPolicy,
     AbstractEventLoop as AbstractEventLoop,
+    AbstractServer as AbstractServer,
     Handle as Handle,
     get_event_loop as get_event_loop,
 )

stdlib/3.4/asyncio/events.pyi

@@ -1,6 +1,7 @@
 from typing import Any, Awaitable, TypeVar, List, Callable, Tuple, Union, Dict, Generator
 from abc import ABCMeta, abstractmethod
 from asyncio.futures import Future
+from asyncio.coroutines import coroutine
 
 # __all__ = ['AbstractServer',
 #            'TimerHandle',
@@ -29,6 +30,10 @@ class Handle:
     def cancel(self) -> None: ...
     def _run(self) -> None: ...
 
+class AbstractServer:
+    def close(self) -> None: ...
+    @coroutine
+    def wait_closed(self) -> None: ...
 
 class AbstractEventLoop(metaclass=ABCMeta):
     @abstractmethod