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The C and C++ Include Header Files

cat -n /usr/include/python3.14/internal/pycore_unionobject.h

     1	#ifndef Py_INTERNAL_UNIONOBJECT_H
     2	#define Py_INTERNAL_UNIONOBJECT_H
     3	#ifdef __cplusplus
     4	extern "C" {
     5	#endif
     6	
     7	#ifndef Py_BUILD_CORE
     8	#  error "this header requires Py_BUILD_CORE define"
     9	#endif
    10	
    11	// For extensions created by test_peg_generator
    12	PyAPI_DATA(PyTypeObject) _PyUnion_Type;
    13	PyAPI_FUNC(PyObject *) _Py_union_type_or(PyObject *, PyObject *);
    14	
    15	#define _PyUnion_Check(op) Py_IS_TYPE((op), &_PyUnion_Type)
    16	
    17	#define _PyGenericAlias_Check(op) PyObject_TypeCheck((op), &Py_GenericAliasType)
    18	extern PyObject *_Py_subs_parameters(PyObject *, PyObject *, PyObject *, PyObject *);
    19	extern PyObject *_Py_make_parameters(PyObject *);
    20	extern PyObject *_Py_union_args(PyObject *self);
    21	extern PyObject *_Py_union_from_tuple(PyObject *args);
    22	
    23	#ifdef __cplusplus
    24	}
    25	#endif
    26	#endif /* !Py_INTERNAL_UNIONOBJECT_H */