From 53f0ed7e689d7e59da12c2241bdecde8514333ab Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@dropbox.com>
Date: Tue, 2 Aug 2016 12:03:58 -0700
Subject: [PATCH] Fix signature of nested() -- it actually returns a list of
 values.

To be on the conservative side I'm making it an Iterable of values;
this should be good enough for common usages.

The types of the values actually correspond to the types of the
argument ContextManagers, but a proper signature would require
variadic type variables (https://github.com/python/typing/issues/193),
which isn't worth waiting for. :-)
---
 stdlib/2and3/contextlib.pyi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/stdlib/2and3/contextlib.pyi b/stdlib/2and3/contextlib.pyi
index 495b24f0d..0f14afaee 100644
--- a/stdlib/2and3/contextlib.pyi
+++ b/stdlib/2and3/contextlib.pyi
@@ -1,7 +1,7 @@
 # Stubs for contextlib
 
 from typing import (
-    Any, Callable, Generator, IO, Iterator, Optional, Type,
+    Any, Callable, Generator, IO, Iterable, Iterator, Optional, Type,
     Generic, TypeVar,
 )
 from types import TracebackType
@@ -23,7 +23,7 @@ class ContextManager(Generic[_T]):
 def contextmanager(func: Callable[..., Iterator[_T]]) -> Callable[..., ContextManager[_T]]: ...
 
 if sys.version_info < (3,):
-    def nested(*mgr: ContextManager[Any]) -> ContextManager[None]: ...
+    def nested(*mgr: ContextManager[Any]) -> ContextManager[Iterable[Any]]: ...
 
 class closing(Generic[_T], ContextManager[_T]):
     def __init__(self, thing: _T) -> None: ...