#!/usr/bin/env python3
"""Check structseq_dealloc's C89 declarations and teardown order."""
import re
import sys
from pathlib import Path

source = Path(sys.argv[1] if len(sys.argv) > 1 else "cpython/Objects/structseq.c")
match = re.search(
    r"static void\nstructseq_dealloc\(PyStructSequence \*obj\)\n\{(.*?)\n\}",
    source.read_text(),
    re.S,
)
assert match, "structseq_dealloc definition not found"
body = match.group(1)
assert re.match(r"\s*Py_ssize_t i, size;\s*PyTypeObject \*tp;", body), (
    "structseq_dealloc: tp must be declared without initializer alongside i and "
    "size before GC untracking; declaration after statement is not C89 compatible"
)
expected = """
    Py_ssize_t i, size;
    PyTypeObject *tp;
    PyObject_GC_UnTrack(obj);

    tp = Py_TYPE(obj);
    size = REAL_SIZE(obj);
    for (i = 0; i < size; ++i) {
        Py_XDECREF(obj->ob_item[i]);
    }
    PyObject_GC_Del(obj);
    if (_PyType_HasFeature(tp, Py_TPFLAGS_HEAPTYPE)) {
        Py_DECREF(tp);
    }
"""
assert re.sub(r"\s+", "", body) == re.sub(r"\s+", "", expected), (
    "preserve GC untracking before type capture and size lookup, item decref "
    "order, GC deletion, and conditional heap-type decref"
)
print("structseq_dealloc C89 declarations and teardown order: PASS")