Remove expectedFailure decorator

Author: harupy

Lib/test/test_ast.py

@@ -1987,8 +1987,6 @@ def test_continued_str(self):
         self._check_end_pos(assign, 2, 13)
         self._check_end_pos(assign.value, 2, 13)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_suites(self):
         # We intentionally put these into the same string to check
         # that empty lines are not part of the suite.