diff -r 5873cfb42ebe Lib/test/test_async_await_deprecation.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lib/test/test_async_await_deprecation.py	Fri Feb 12 14:27:16 2016 +0100
@@ -0,0 +1,14 @@
+import unittest
+
+class AsyncAwaitDeprecationTest(unittest.TestCase):
+
+    def test_async(self):
+        with self.assertWarnsRegex(DeprecationWarning, "reserved keyword"):
+            exec('async = 33')
+
+    def test_await(self):
+        with self.assertWarnsRegex(DeprecationWarning, "reserved keyword"):
+            exec('await = 33')
+
+if __name__ == "__main__":
+    unittest.main()
diff -r 5873cfb42ebe Python/ast.c
--- a/Python/ast.c	Tue Feb 02 17:04:56 2016 -0600
+++ b/Python/ast.c	Fri Feb 12 14:27:16 2016 +0100
@@ -2073,6 +2073,21 @@
                 return NameConstant(Py_True, LINENO(n), n->n_col_offset, c->c_arena);
             if (!strcmp(s, "False"))
                 return NameConstant(Py_False, LINENO(n), n->n_col_offset, c->c_arena);
+            /* Warn about async and await as NAMES */
+            if (!strcmp(s, "async")) {
+                if (PyErr_WarnEx(PyExc_DeprecationWarning,
+                                 "'async' will become a reserved keyword "
+                                 "in Python 3.7", 1) < 0) {
+                    ;  // goto error;
+                }
+            }
+            if (!strcmp(s, "await")) {
+                if (PyErr_WarnEx(PyExc_DeprecationWarning,
+                                 "'await' will become a reserved keyword "
+                                 "in Python 3.7", 1) < 0) {
+                    ;  // goto error;
+                }
+            }
         }
         name = new_identifier(s, c);
         if (!name)