pythongh-111178: Fix function signatures in structseq.c (python#130683)

Objects/structseq.c

@@ -108,8 +108,9 @@ PyStructSequence_GetItem(PyObject *op, Py_ssize_t index)
 
 
 static int
-structseq_traverse(PyStructSequence *obj, visitproc visit, void *arg)
+structseq_traverse(PyObject *op, visitproc visit, void *arg)
 {
+    PyStructSequence *obj = (PyStructSequence *)op;
     if (Py_TYPE(obj)->tp_flags & Py_TPFLAGS_HEAPTYPE) {
         Py_VISIT(Py_TYPE(obj));
     }
@@ -122,8 +123,9 @@ structseq_traverse(PyStructSequence *obj, visitproc visit, void *arg)
 }
 
 static void
-structseq_dealloc(PyStructSequence *obj)
+structseq_dealloc(PyObject *op)
 {
+    PyStructSequence *obj = (PyStructSequence *)op;
     Py_ssize_t i, size;
     PyObject_GC_UnTrack(obj);
 
@@ -263,8 +265,9 @@ structseq_new_impl(PyTypeObject *type, PyObject *arg, PyObject *dict)
 
 
 static PyObject *
-structseq_repr(PyStructSequence *obj)
+structseq_repr(PyObject *op)
 {
+    PyStructSequence *obj = (PyStructSequence *)op;
     PyTypeObject *typ = Py_TYPE(obj);
 
     // count 5 characters per item: "x=1, "
@@ -568,14 +571,14 @@ initialize_static_fields(PyTypeObject *type, PyStructSequence_Desc *desc,
     Py_ssize_t n_hidden = n_members - desc->n_in_sequence;
     type->tp_basicsize = sizeof(PyStructSequence) + (n_hidden - 1) * sizeof(PyObject *);
     type->tp_itemsize = sizeof(PyObject *);
-    type->tp_dealloc = (destructor)structseq_dealloc;
-    type->tp_repr = (reprfunc)structseq_repr;
+    type->tp_dealloc = structseq_dealloc;
+    type->tp_repr = structseq_repr;
     type->tp_doc = desc->doc;
     type->tp_base = &PyTuple_Type;
     type->tp_methods = structseq_methods;
     type->tp_new = structseq_new;
     type->tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | tp_flags;
-    type->tp_traverse = (traverseproc) structseq_traverse;
+    type->tp_traverse = structseq_traverse;
     type->tp_members = tp_members;
 }
 
@@ -745,13 +748,13 @@ _PyStructSequence_NewType(PyStructSequence_Desc *desc, unsigned long tp_flags)
     }
 
     /* Initialize Slots */
-    slots[0] = (PyType_Slot){Py_tp_dealloc, (destructor)structseq_dealloc};
-    slots[1] = (PyType_Slot){Py_tp_repr, (reprfunc)structseq_repr};
+    slots[0] = (PyType_Slot){Py_tp_dealloc, structseq_dealloc};
+    slots[1] = (PyType_Slot){Py_tp_repr, structseq_repr};
     slots[2] = (PyType_Slot){Py_tp_doc, (void *)desc->doc};
     slots[3] = (PyType_Slot){Py_tp_methods, structseq_methods};
     slots[4] = (PyType_Slot){Py_tp_new, structseq_new};
     slots[5] = (PyType_Slot){Py_tp_members, members};
-    slots[6] = (PyType_Slot){Py_tp_traverse, (traverseproc)structseq_traverse};
+    slots[6] = (PyType_Slot){Py_tp_traverse, structseq_traverse};
     slots[7] = (PyType_Slot){0, 0};
 
     /* Initialize Spec */