Function igraph_similarity_jaccard 

pub unsafe extern "C" fn igraph_similarity_jaccard(
    graph: *const igraph_t,
    res: *mut igraph_matrix_t,
    vit_from: igraph_vs_t,
    vit_to: igraph_vs_t,
    mode: igraph_neimode_t,
    loops: igraph_bool_t,
) -> igraph_error_t