gh-131927: Do not emit PEP 765 warnings in ast.parse() (GH-139642)

ast.parse() no longer emits syntax warnings for
return/break/continue in finally (see PEP-765) -- they are only
emitted during compilation.

Lib/test/test_pyrepl/test_interact.py

@@ -1,5 +1,6 @@
 import contextlib
 import io
+import warnings
 import unittest
 from unittest.mock import patch
 from textwrap import dedent
@@ -273,3 +274,28 @@ def test_incomplete_statement(self):
         code = "if foo:"
         console = InteractiveColoredConsole(namespace, filename="<stdin>")
         self.assertTrue(_more_lines(console, code))
+
+
+class TestWarnings(unittest.TestCase):
+    def test_pep_765_warning(self):
+        """
+        Test that a SyntaxWarning emitted from the
+        AST optimizer is only shown once in the REPL.
+        """
+        # gh-131927
+        console = InteractiveColoredConsole()
+        code = dedent("""\
+        def f():
+            try:
+                return 1
+            finally:
+                return 2
+        """)
+
+        with warnings.catch_warnings(record=True) as caught:
+            warnings.simplefilter("always")
+            console.runsource(code)
+
+        count = sum("'return' in a 'finally' block" in str(w.message)
+                    for w in caught)
+        self.assertEqual(count, 1)