[3.10] bpo-44654: Refactor and clean up the union type implementation (GH-27196) (GH-27219)

(cherry picked from commit 0fd27375cabd12e68a2f12cfeca11a2d5043429e)

1 files changed, 4 insertions, 3 deletions

diff --git a/Include/internal/pycore_unionobject.h b/Include/internal/pycore_unionobject.h
index faa17e0a96..ec6cc01c09 100644
--- a/Include/internal/pycore_unionobject.h
+++ b/Include/internal/pycore_unionobject.h
@@ -8,10 +8,11 @@ extern "C" {
 #  error "this header requires Py_BUILD_CORE define"
 #endif
 
-PyAPI_FUNC(PyObject *) _Py_Union(PyObject *args);
-PyAPI_DATA(PyTypeObject) _Py_UnionType;
-PyAPI_FUNC(PyObject *) _Py_union_type_or(PyObject* self, PyObject* param);
+extern PyTypeObject _PyUnion_Type;
+#define _PyUnion_Check(op) Py_IS_TYPE(op, &_PyUnion_Type)
+PyAPI_FUNC(PyObject *) _Py_union_type_or(PyObject *, PyObject *);
 
+#define _PyGenericAlias_Check(op) PyObject_TypeCheck(op, &Py_GenericAliasType)
 PyObject *_Py_subs_parameters(PyObject *, PyObject *, PyObject *, PyObject *);
 PyObject *_Py_make_parameters(PyObject *);