Add test cases with combining characters

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: serhiy-storchaka

Lib/test/test_exceptions.py

@@ -239,8 +239,10 @@ def testSyntaxErrorRange(self):
         for source, offset, end_offset in [
             ('abcd = 00010', 8, 11),
             ('\u03b1\u03b2\u03b3\u03b4 = 00010', 8, 11),
+            ('a\u0301b\u0308c\u20d7d\u1ab0 = 00010', 12, 15),
             ("abcd = ub'a'", 8, 10),
             ("\u03b1\u03b2\u03b3\u03b4 = ub'a'", 8, 10),
+            ("a\u0301b\u0308c\u20d7d\u1ab0 = ub'a'", 12, 14),
         ]:
             with self.subTest(source=source):
                 with self.assertRaises(SyntaxError) as cm: