Updated STORE_FAST; Changed magic number; Added test

Author: brijkapadia

Include/internal/pycore_magic_number.h

@@ -292,6 +292,7 @@ Known values:
     Python 3.15a4 3659 (Add CALL_FUNCTION_EX specialization)
     Python 3.15a4 3660 (Change generator preamble code)
     Python 3.15a4 3661 (Lazy imports IMPORT_NAME opcode changes)
+    Python 3.15a7+ 3662 (Replace DELETE_FAST with PUSH_NULL; STORE_FAST)
 
 
     Python 3.16 will start with 3700
@@ -305,7 +306,7 @@ PC/launcher.c must also be updated.
 
 */
 
-#define PYC_MAGIC_NUMBER 3661
+#define PYC_MAGIC_NUMBER 3662
 /* This is equivalent to converting PYC_MAGIC_NUMBER to 2 bytes
    (little-endian) and then appending b'\r\n'. */
 #define PYC_MAGIC_NUMBER_TOKEN \

Lib/test/test_compiler_codegen.py

@@ -161,3 +161,15 @@ def test_syntax_error__return_not_in_function(self):
         self.assertIsNone(cm.exception.text)
         self.assertEqual(cm.exception.offset, 1)
         self.assertEqual(cm.exception.end_offset, 10)
+
+    def test_del_for_store_name(self):
+        snippet = "del x"
+        expected = [
+            ('RESUME', 0),
+            ('ANNOTATIONS_PLACEHOLDER', None),
+            ('PUSH_NULL', None),
+            ('STORE_NAME', 0),
+            ('LOAD_CONST', 0),
+            ('RETURN_VALUE', None),
+        ]
+        self.codegen_test(snippet, expected)

Modules/_testinternalcapi/test_cases.c.h

@@ -1628,18 +1628,26 @@ dummy_func(
         inst(STORE_NAME, (v -- )) {
             PyObject *name = GETITEM(FRAME_CO_NAMES, oparg);
             PyObject *ns = LOCALS();
+            int deletion = PyStackRef_IsNull(v);
             int err;
             if (ns == NULL) {
-                _PyErr_Format(tstate, PyExc_SystemError,
-                              "no locals found when storing %R", name);
-                PyStackRef_CLOSE(v);
+                const char *msg = deletion
+                    ? "no locals found when deleting %R"
+                    : "no locals found when storing %R";
+                _PyErr_Format(tstate, PyExc_SystemError, msg, name);
+                if (deletion) {
+                    DEAD(v);
+                }
+                else {
+                    PyStackRef_CLOSE(v);
+                }
                 ERROR_IF(true);
             }
 
-            if (PyStackRef_IsNull(v)) {
+            if (deletion) {
                 DEAD(v);
                 err = PyObject_DelItem(ns, name);
-                if (err != 0) {
+                if (err) {
                     _PyEval_FormatExcCheckArg(tstate, PyExc_NameError,
                                             NAME_ERROR_MSG,
                                             name);