Fix Py_GenericAliasIterType to be finalized at exit.

Author: corona10

Include/internal/pycore_genericaliasobject.h

@@ -0,0 +1,16 @@
+#ifndef Py_INTERNAL_GENERICALIASOBJECT_H
+#define Py_INTERNAL_GENERICALIASOBJECT_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef Py_BUILD_CORE
+#  error "this header requires Py_BUILD_CORE define"
+#endif
+
+extern PyTypeObject _Py_GenericAliasIterType;
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_INTERNAL_GENERICALIASOBJECT_H */

Misc/NEWS.d/next/Core and Builtins/2022-04-20-14-43-37.gh-issue-91632.cvUhsZ.rst

@@ -0,0 +1 @@
+Fix :class:`generic_alias_iterator` to be finalized at exit.

Objects/genericaliasobject.c

@@ -683,7 +683,7 @@ ga_iter_clear(PyObject *self) {
     return 0;
 }
 
-static PyTypeObject Py_GenericAliasIterType = {
+PyTypeObject _Py_GenericAliasIterType = {
     PyVarObject_HEAD_INIT(&PyType_Type, 0)
     .tp_name = "generic_alias_iterator",
     .tp_basicsize = sizeof(gaiterobject),
@@ -697,7 +697,7 @@ static PyTypeObject Py_GenericAliasIterType = {
 
 static PyObject *
 ga_iter(PyObject *self) {
-    gaiterobject *gi = PyObject_GC_New(gaiterobject, &Py_GenericAliasIterType);
+    gaiterobject *gi = PyObject_GC_New(gaiterobject, &_Py_GenericAliasIterType);
     if (gi == NULL) {
         return NULL;
     }

Objects/object.c

@@ -18,6 +18,7 @@
 #include "pycore_unionobject.h"   // _PyUnion_Type
 #include "frameobject.h"          // PyFrame_Type
 #include "pycore_interpreteridobject.h"  // _PyInterpreterID_Type
+#include "pycore_genericaliasobject.h"  // _Py_GenericAliasIterType
 
 #ifdef Py_LIMITED_API
    // Prevent recursive call _Py_IncRef() <=> Py_INCREF()
@@ -1923,6 +1924,7 @@ static PyTypeObject* static_types[] = {
     &_PyAsyncGenWrappedValue_Type,
     &_PyContextTokenMissing_Type,
     &_PyCoroWrapper_Type,
+    &_Py_GenericAliasIterType,
     &_PyHamtItems_Type,
     &_PyHamtKeys_Type,
     &_PyHamtValues_Type,