[3.10] bpo-45408: Don't override previous tokenizer errors in the second parser pass (GH-28812). (GH-28813)

(cherry picked from commit 0219017df7ec41839fd0d56a3076b5f09c58d313)

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>

2 files changed, 9 insertions, 1 deletions

diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 326f3ab2be..39fc7e9673 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -1044,6 +1044,14 @@ Module(
         with self.assertRaisesRegex(ValueError, msg):
             ast.literal_eval(node)
 
+    def test_literal_eval_syntax_errors(self):
+        msg = "unexpected character after line continuation character"
+        with self.assertRaisesRegex(SyntaxError, msg):
+            ast.literal_eval(r'''
+                \
+                (\
+            \ ''')
+
     def test_bad_integer(self):
         # issue13436: Bad error message with invalid numeric values
         body = [ast.ImportFrom(module='time',
diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index d04e5f5573..4213dabfd8 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -223,7 +223,7 @@ class ExceptionTests(unittest.TestCase):
         check('x = "a', 1, 5)
         check('lambda x: x = 2', 1, 1)
         check('f{a + b + c}', 1, 2)
-        check('[file for str(file) in []\n])', 2, 2)
+        check('[file for str(file) in []\n])', 1, 11)
         check('a = « hello » « world »', 1, 5)
         check('[\nfile\nfor str(file)\nin\n[]\n]', 3, 5)
         check('[file for\n str(file) in []]', 2, 2)