From f0d89175ad7ef7afde35ce7838ff71298d04b8a5 Mon Sep 17 00:00:00 2001
From: "Tomas R." <tomas.roun8@gmail.com>
Date: Sat, 12 Apr 2025 12:34:36 +0200
Subject: [PATCH 1/2] [3.13] gh-131927: Prevent emitting optimizer warnings
 twice in the REPL (GH-131993) (cherry picked from commit
 3d08c8ad20dfabd4864be139cd9c2eb5602ccdfe)

Co-authored-by: Tomas R. <tomas.roun8@gmail.com>
---
 Include/cpython/warnings.h            |  6 ++++++
 Lib/test/test_compile.py              | 18 ++++++++++++++++++
 Lib/test/test_pyrepl/test_interact.py |  1 +
 Python/_warnings.c                    | 22 ++++++++++++++++++++++
 Python/compile.c                      |  4 ++--
 5 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/Include/cpython/warnings.h b/Include/cpython/warnings.h
index 4e3eb88e8ff447..8731fd2e96b716 100644
--- a/Include/cpython/warnings.h
+++ b/Include/cpython/warnings.h
@@ -18,3 +18,9 @@ PyAPI_FUNC(int) PyErr_WarnExplicitFormat(
 
 // DEPRECATED: Use PyErr_WarnEx() instead.
 #define PyErr_Warn(category, msg) PyErr_WarnEx((category), (msg), 1)
+
+int _PyErr_WarnExplicitObjectWithContext(
+    PyObject *category,
+    PyObject *message,
+    PyObject *filename,
+    int lineno);
diff --git a/Lib/test/test_compile.py b/Lib/test/test_compile.py
index ed4e6265eac438..b57adfadb5af5f 100644
--- a/Lib/test/test_compile.py
+++ b/Lib/test/test_compile.py
@@ -1512,6 +1512,24 @@ async def name_4():
                     pass
             [[]]
 
+    def test_compile_warnings(self):
+        # See gh-131927
+        # Compile warnings originating from the same file and
+        # line are now only emitted once.
+        with warnings.catch_warnings(record=True) as caught:
+            warnings.simplefilter("default")
+            compile('1 is 1', '<stdin>', 'eval')
+            compile('1 is 1', '<stdin>', 'eval')
+
+        self.assertEqual(len(caught), 1)
+
+        with warnings.catch_warnings(record=True) as caught:
+            warnings.simplefilter("always")
+            compile('1 is 1', '<stdin>', 'eval')
+            compile('1 is 1', '<stdin>', 'eval')
+
+        self.assertEqual(len(caught), 2)
+
 @requires_debug_ranges()
 class TestSourcePositions(unittest.TestCase):
     # Ensure that compiled code snippets have correct line and column numbers
diff --git a/Lib/test/test_pyrepl/test_interact.py b/Lib/test/test_pyrepl/test_interact.py
index 2041a35c8a472b..dce79256d7045d 100644
--- a/Lib/test/test_pyrepl/test_interact.py
+++ b/Lib/test/test_pyrepl/test_interact.py
@@ -1,6 +1,7 @@
 import contextlib
 import io
 import unittest
+import warnings
 from unittest.mock import patch
 from textwrap import dedent
 
diff --git a/Python/_warnings.c b/Python/_warnings.c
index 4bb83b214ae6cc..5bbd4a9c19f6c9 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -1317,6 +1317,28 @@ PyErr_WarnExplicitObject(PyObject *category, PyObject *message,
     return 0;
 }
 
+/* Like PyErr_WarnExplicitObject, but automatically sets up context */
+int
+_PyErr_WarnExplicitObjectWithContext(PyObject *category, PyObject *message,
+                                     PyObject *filename, int lineno)
+{
+    PyObject *unused_filename, *module, *registry;
+    int unused_lineno;
+    int stack_level = 1;
+
+    if (!setup_context(stack_level, NULL, &unused_filename, &unused_lineno,
+                       &module, &registry)) {
+        return -1;
+    }
+
+    int rc = PyErr_WarnExplicitObject(category, message, filename, lineno,
+                                      module, registry);
+    Py_DECREF(unused_filename);
+    Py_DECREF(registry);
+    Py_DECREF(module);
+    return rc;
+}
+
 int
 PyErr_WarnExplicit(PyObject *category, const char *text,
                    const char *filename_str, int lineno,
diff --git a/Python/compile.c b/Python/compile.c
index ba780927eff9d6..bb2c2293a38c9a 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -6616,8 +6616,8 @@ compiler_warn(struct compiler *c, location loc,
     if (msg == NULL) {
         return ERROR;
     }
-    if (PyErr_WarnExplicitObject(PyExc_SyntaxWarning, msg, c->c_filename,
-                                 loc.lineno, NULL, NULL) < 0)
+    if (_PyErr_WarnExplicitObjectWithContext(PyExc_SyntaxWarning, msg,
+                                             c->c_filename, loc.lineno) < 0)
     {
         if (PyErr_ExceptionMatches(PyExc_SyntaxWarning)) {
             /* Replace the SyntaxWarning exception with a SyntaxError

From 99d3b5be93da85d449a4745b7489a39bc856660c Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Sun, 13 Apr 2025 11:18:26 +0300
Subject: [PATCH 2/2] Update test_interact.py

---
 Lib/test/test_pyrepl/test_interact.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Lib/test/test_pyrepl/test_interact.py b/Lib/test/test_pyrepl/test_interact.py
index dce79256d7045d..2041a35c8a472b 100644
--- a/Lib/test/test_pyrepl/test_interact.py
+++ b/Lib/test/test_pyrepl/test_interact.py
@@ -1,7 +1,6 @@
 import contextlib
 import io
 import unittest
-import warnings
 from unittest.mock import patch
 from textwrap import dedent
 

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