warning in fstring invalid escape is now raised

Author: timfel

graalpython/lib-python/3/test/test_fstring.py

@@ -656,9 +656,8 @@ def test_backslashes_in_string_part(self):
         self.assertEqual(f'2\x203', '2 3')
         self.assertEqual(f'\x203', ' 3')
 
-        # GraalPython patch: needs warnings support
-        # with self.assertWarns(DeprecationWarning):  # invalid escape sequence
-        value = eval(r"f'\{6*7}'") # this should be inside the "with" statement
+        with self.assertWarns(DeprecationWarning):  # invalid escape sequence
+            value = eval(r"f'\{6*7}'")
         self.assertEqual(value, '\\42')
         self.assertEqual(f'\\{6*7}', '\\42')
         self.assertEqual(fr'\{6*7}', '\\42')