GH-91095: Specialize calls to normal Python classes. (GH-99331)

2 files changed, 24 insertions, 2 deletions

diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index d81501f..37f75ad 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -1557,7 +1557,7 @@ class SizeofTest(unittest.TestCase):
                   '10P'                 # PySequenceMethods
                   '2P'                  # PyBufferProcs
                   '6P'
-                  '1PI'                 # Specializer cache
+                  '1PIP'                 # Specializer cache
                   )
         class newstyleclass(object): pass
         # Separate block for PyDictKeysObject with 8 keys and 5 entries
diff --git a/Lib/test/test_sys_settrace.py b/Lib/test/test_sys_settrace.py
index 5603c3c..4462b5c 100644
--- a/Lib/test/test_sys_settrace.py
+++ b/Lib/test/test_sys_settrace.py
@@ -1614,8 +1614,30 @@ class TraceTestCase(unittest.TestCase):
 
         self.run_and_compare(func, EXPECTED_EVENTS)
 
-    def test_settrace_error(self):
+    def test_correct_tracing_quickened_call_class_init(self):
+
+        class C:
+            def __init__(self):
+                self
+
+        def func():
+            C()
 
+        EXPECTED_EVENTS = [
+            (0, 'call'),
+            (1, 'line'),
+            (-3, 'call'),
+            (-2, 'line'),
+            (-2, 'return'),
+            (1, 'return')]
+
+        self.run_and_compare(func, EXPECTED_EVENTS)
+        # Quicken
+        for _ in range(100):
+            func()
+        self.run_and_compare(func, EXPECTED_EVENTS)
+
+    def test_settrace_error(self):
         raised = False
         def error_once(frame, event, arg):
             nonlocal raised