bpo-35029: Replace the SyntaxWarning exception with a SyntaxError. (GH-9999)

If SyntaxWarning was raised as an exception, it will be replaced
with a SyntaxError for better error reporting.

1 files changed, 9 insertions, 0 deletions

diff --git a/Lib/test/test_grammar.py b/Lib/test/test_grammar.py
index 9dd42b4..3d8b151 100644
--- a/Lib/test/test_grammar.py
+++ b/Lib/test/test_grammar.py
@@ -5,6 +5,7 @@ from test.support import check_syntax_error
 import inspect
 import unittest
 import sys
+import warnings
 # testing import *
 from sys import *
 
@@ -1099,6 +1100,14 @@ class GrammarTests(unittest.TestCase):
         else:
             self.fail("AssertionError not raised by 'assert False'")
 
+        with self.assertWarnsRegex(SyntaxWarning, 'assertion is always true'):
+            compile('assert(x, "msg")', '<testcase>', 'exec')
+        with warnings.catch_warnings():
+            warnings.filterwarnings('error', category=SyntaxWarning)
+            with self.assertRaisesRegex(SyntaxError, 'assertion is always true'):
+                compile('assert(x, "msg")', '<testcase>', 'exec')
+            compile('assert x, "msg"', '<testcase>', 'exec')
+
 
     ### compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | funcdef | classdef
     # Tested below