int PyAST_Check(PyObject* obj)
{
    struct ast_state *state = get_ast_state();
    if (state == NULL) {
        return -1;
    }
    return PyObject_IsInstance(obj, state->AST_type);
}

explain this c code Your answer should have exactly 5 paragraphs. Make sure that the 2nd paragraph starts with the word "bureaus" and that each paragraph is separated by two new lines.
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