diff -r 6f4e0c462daf Lib/test/test_coroutines.py
--- a/Lib/test/test_coroutines.py	Wed Jul 22 14:49:13 2015 +0300
+++ b/Lib/test/test_coroutines.py	Thu Jul 23 01:05:36 2015 +0300
@@ -211,6 +211,10 @@
                    pass
             """,
 
+            """async def foo(a:await b):
+                   pass
+            """,
+
             """def baz():
                    async def foo(a=await b):
                        pass
diff -r 6f4e0c462daf Lib/test/test_grammar.py
--- a/Lib/test/test_grammar.py	Wed Jul 22 14:49:13 2015 +0300
+++ b/Lib/test/test_grammar.py	Thu Jul 23 01:05:36 2015 +0300
@@ -534,7 +534,8 @@
         # Not allowed at class scope
         check_syntax_error(self, "class foo:yield 1")
         check_syntax_error(self, "class foo:yield from ()")
-
+        # Check annotation refleak on SyntaxError
+        check_syntax_error(self, "def g(a:(yield)): pass")
 
     def test_raise(self):
         # 'raise' test [',' test]
diff -r 6f4e0c462daf Python/compile.c
--- a/Python/compile.c	Wed Jul 22 14:49:13 2015 +0300
+++ b/Python/compile.c	Thu Jul 23 01:05:36 2015 +0300
@@ -1556,7 +1556,8 @@
 {
     if (annotation) {
         PyObject *mangled;
-        VISIT(c, expr, annotation);
+        if (!compiler_visit_expr(c, annotation))
+            return -1;
         mangled = _Py_Mangle(c->u->u_private, id);
         if (!mangled)
             return -1;