Function igraph_maximal_independent_vertex_sets 

pub unsafe extern "C" fn igraph_maximal_independent_vertex_sets(
    graph: *const igraph_t,
    res: *mut igraph_vector_int_list_t,
    min_size: igraph_int_t,
    max_size: igraph_int_t,
    max_results: igraph_int_t,
) -> igraph_error_t