Issue #23456: Add missing @coroutine decorators in asyncio
diff --git a/Lib/asyncio/locks.py b/Lib/asyncio/locks.py
index b943e9d..41a68c6 100644
--- a/Lib/asyncio/locks.py
+++ b/Lib/asyncio/locks.py
@@ -162,6 +162,7 @@
         # always raises; that's how the with-statement works.
         pass
 
+    @coroutine
     def __iter__(self):
         # This is not a coroutine.  It is meant to enable the idiom:
         #
@@ -362,6 +363,7 @@
     def __exit__(self, *args):
         pass
 
+    @coroutine
     def __iter__(self):
         # See comment in Lock.__iter__().
         yield from self.acquire()
@@ -446,6 +448,7 @@
     def __exit__(self, *args):
         pass
 
+    @coroutine
     def __iter__(self):
         # See comment in Lock.__iter__().
         yield from self.acquire()