From db74d982d43d98040e38665d843cbc8de4a082b1 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Tue, 10 Jun 2014 11:16:05 +0200
Subject: [PATCH] Issue #21596: asyncio.wait(): mention that the sequence of
 futures must not be empty.

---
 Doc/library/asyncio-task.rst | 2 ++
 Lib/asyncio/tasks.py         | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/Doc/library/asyncio-task.rst b/Doc/library/asyncio-task.rst
index eb254a9152f..f1894daf31e 100644
--- a/Doc/library/asyncio-task.rst
+++ b/Doc/library/asyncio-task.rst
@@ -521,6 +521,8 @@ Task functions
    to complete.  Coroutines will be wrapped in Tasks. Returns two sets of
    :class:`Future`: (done, pending).
 
+   The sequence *futures* must not be empty.
+
    *timeout* can be used to control the maximum number of seconds to wait before
    returning.  *timeout* can be an int or float.  If *timeout* is not specified
    or ``None``, there is no limit to the wait time.
diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index 2aa568bc6d5..8b8fb82ed2d 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -387,6 +387,8 @@ ALL_COMPLETED = concurrent.futures.ALL_COMPLETED
 def wait(fs, *, loop=None, timeout=None, return_when=ALL_COMPLETED):
     """Wait for the Futures and coroutines given by fs to complete.
 
+    The sequence futures must not be empty.
+
     Coroutines will be wrapped in Tasks.
 
     Returns two sets of Future: (done, pending).