[unit_test] failing test due to precedence error

tests/test_parser.py

@@ -371,7 +371,6 @@ def test_with_member_access_call_in_addition(self):
             (to: ToolOutput)
             "File " + tc.function.arguments.arg.strip() + " not found" in to.content
         """)
-
         self.assertIsInstance(policy.statements[0].body[1], ast.BinaryExpr)
         self.assertIsInstance(policy.statements[0].body[1].left, ast.BinaryExpr)
         self.assertIsInstance(policy.statements[0].body[1].left.left, ast.BinaryExpr)
@@ -387,5 +386,14 @@ def test_with_member_access_call_in_addition(self):
         self.assertEqual(policy.statements[0].body[1].left.left.right.name.expr.expr.expr.member, "function")
         self.assertIsInstance(policy.statements[0].body[1].left.left.right.name.expr.expr.expr.expr, ast.Identifier)
 
+    def test_assign_in(self):
+        policy = parse("""
+        raise "error" if:
+            (msg: Message)
+            flag := ["a", "b"] in ["a"]
+        """)
+        self.assertEqual(policy.statements[0].body[1].op, ":=")
+
+
 if __name__ == "__main__":
     unittest.main()