[issue34480] _markupbase.py fails with UnboundLocalError on invalid keyword in marked section

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.kar...@gmail.com> added the comment:

Attaching a test case for this issue since the self.error code path was not 
covered in the current test suite. A PR is open proposing match variable 
initialisation with None https://github.com/python/cpython/pull/17643 .

diff --git Lib/test/test_htmlparser.py Lib/test/test_htmlparser.py
index a2bfb39d16..a9aff11706 100644
--- Lib/test/test_htmlparser.py
+++ Lib/test/test_htmlparser.py
@@ -766,6 +766,18 @@ class AttributesTestCase(TestCaseBase):
                           [("href", "http://www.example.org/\";>;")]),
                          ("data", "spam"), ("endtag", "a")])
 
+    def test_invalid_keyword_error_exception(self):
+        class InvalidMarkupException(Exception):
+            pass
+
+        class MyHTMLParser(html.parser.HTMLParser):
+
+            def error(self, message):
+                raise InvalidMarkupException(message)
+
+        parser = MyHTMLParser()
+        with self.assertRaises(InvalidMarkupException):
+            parser.feed('<![invalid>')
 
 if __name__ == "__main__":
     unittest.main()

----------
nosy: +xtreak

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