From dce23a614f2d11bd802c7f9aed8f3ab0e883f468 Mon Sep 17 00:00:00 2001
From: Bob Halley <halley@dnspython.org>
Date: Sat, 13 Jun 2020 10:57:46 -0700
Subject: [PATCH] Add some comments about opportunities after 3.6 is not
 supported.

---
 dns/_asyncbackend.py | 3 ++-
 dns/asyncquery.py    | 3 +++
 tests/test_async.py  | 1 +
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/dns/_asyncbackend.py b/dns/_asyncbackend.py
index dc1330e1..093713d1 100644
--- a/dns/_asyncbackend.py
+++ b/dns/_asyncbackend.py
@@ -5,7 +5,8 @@ import socket
 import dns.inet
 
 
-# This is a nullcontext for both sync and async
+# This is a nullcontext for both sync and async.  3.7 has a nullcontext,
+# but it is only for sync use.
 
 class NullContext:
     def __init__(self, enter_result=None):
diff --git a/dns/asyncquery.py b/dns/asyncquery.py
index 68d1a355..03e9fada 100644
--- a/dns/asyncquery.py
+++ b/dns/asyncquery.py
@@ -189,6 +189,7 @@ async def udp(q, where, timeout=None, port=53, source=None, source_port=0,
     wire = q.to_wire()
     (begin_time, expiration) = _compute_times(timeout)
     s = None
+    # After 3.6 is no longer supported, this can use an AsyncExitStack.
     try:
         if sock:
             s = sock
@@ -391,6 +392,7 @@ async def tcp(q, where, timeout=None, port=53, source=None, source_port=0,
     wire = q.to_wire()
     (begin_time, expiration) = _compute_times(timeout)
     s = None
+    # After 3.6 is no longer supported, this can use an AsyncExitStack.
     try:
         if sock:
             # Verify that the socket is connected, as if it's not connected,
@@ -468,6 +470,7 @@ async def tls(q, where, timeout=None, port=853, source=None, source_port=0,
 
     Returns a ``dns.message.Message``.
     """
+    # After 3.6 is no longer supported, this can use an AsyncExitStack.
     (begin_time, expiration) = _compute_times(timeout)
     if not sock:
         if ssl_context is None:
diff --git a/tests/test_async.py b/tests/test_async.py
index ed75b9c1..5c263092 100644
--- a/tests/test_async.py
+++ b/tests/test_async.py
@@ -57,6 +57,7 @@ class AsyncTests(unittest.TestCase):
         try:
             runner = asyncio.run
         except AttributeError:
+            # this is only needed for 3.6
             def old_runner(awaitable):
                 loop = asyncio.get_event_loop()
                 return loop.run_until_complete(awaitable)
-- 
2.47.3