add types.AsyncGeneratorType (#1322)

stdlib/3/types.pyi

@@ -5,8 +5,8 @@
 
 import sys
 from typing import (
-    Any, Callable, Dict, Generic, Iterator, Mapping, Optional, Tuple, TypeVar,
-    Union, overload
+    Any, Awaitable, Callable, Dict, Generic, Iterator, Mapping, Optional, Tuple, TypeVar,
+    Union, overload, Type
 )
 
 # ModuleType is exported from this module, but for circular import
@@ -14,6 +14,8 @@ from typing import (
 from _importlib_modulespec import ModuleType as ModuleType  # Exported
 
 _T = TypeVar('_T')
+_T_co = TypeVar('_T_co', covariant=True)
+_T_contra = TypeVar('_T_contra', contravariant=True)
 _KT = TypeVar('_KT')
 _VT = TypeVar('_VT')
 
@@ -92,6 +94,21 @@ class GeneratorType:
     @overload
     def throw(self, typ: type, val: BaseException = ..., tb: 'TracebackType' = ...) -> Any: ...
 
+if sys.version_info >= (3, 6):
+    class AsyncGeneratorType(Generic[_T_co, _T_contra]):
+        ag_await: Optional[Awaitable[Any]]
+        ag_frame: FrameType
+        ag_running: bool
+        ag_code: CodeType
+        def __aiter__(self) -> Awaitable[AsyncGeneratorType[_T_co, _T_contra]]: ...
+        def __anext__(self) -> Awaitable[_T_co]: ...
+        def asend(self, val: _T_contra) -> Awaitable[_T_co]: ...
+        @overload
+        def athrow(self, val: BaseException) -> Awaitable[_T_co]: ...
+        @overload
+        def athrow(self, typ: Type[BaseException], val: BaseException, tb: TracebackType = ...) -> Awaitable[_T_co]: ...
+        def aclose(self) -> Awaitable[_T_co]: ...
+
 class CoroutineType:
     cr_await = ...  # type: Optional[Any]
     cr_code = ...  # type: CodeType