#4640: add a test to optparse that proves issue is invalid.

Lib/test/test_optparse.py

@@ -764,6 +764,11 @@ class TestStandard(BaseTest):
                            {'a': "-b3", 'boo': None, 'foo': None},
                            [])
 
+    def test_combined_single_invalid_option(self):
+        self.parser.add_option("-t", action="store_true")
+        self.assertParseFail(["-test"],
+                          "no such option: -e")
+
 class TestBool(BaseTest):
     def setUp(self):
         options = [make_option("-v",