#!/usr/bin/env python3
"""Check type_set_annotations's C89 local and unchanged executable body."""
import re
from pathlib import Path

source = Path("cpython/Objects/typeobject.c").read_text()
match = re.search(
    r"\nstatic int\ntype_set_annotations\(PyTypeObject \*type, PyObject \*value, void \*context\)\n\{(.*?)\n\}",
    source,
    re.S,
)
assert match, "type_set_annotations definition missing"
body = match.group(1)
assert re.match(r"\s*int result;\s*if\b", body), (
    "type_set_annotations: result must be declared before the immutable-type guard"
)
assert len(re.findall(r"\bint\s+result\b", body)) == 1, (
    "type_set_annotations: declare result exactly once"
)
expected = """
    int result;
    if (_PyType_HasFeature(type, Py_TPFLAGS_IMMUTABLETYPE)) {
        PyErr_Format(PyExc_TypeError,
                     "cannot set '__annotations__' attribute of immutable type '%s'",
                     type->tp_name);
        return -1;
    }

    if (value != NULL) {
        /* set */
        result = PyDict_SetItem(type->tp_dict, &_Py_ID(__annotations__), value);
    } else {
        /* delete */
        result = PyDict_DelItem(type->tp_dict, &_Py_ID(__annotations__));
        if (result < 0 && PyErr_ExceptionMatches(PyExc_KeyError)) {
            PyErr_SetString(PyExc_AttributeError, "__annotations__");
        }
    }

    if (result == 0) {
        PyType_Modified(type);
    }
    return result;
"""
assert body.split() == expected.split(), (
    "type_set_annotations: preserve guard, assignments, set/delete branches, "
    "error handling, invalidation, and return in their original order"
)
print("type_set_annotations result C89 declaration and unchanged executable body: PASS")